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// SPDX-License-Identifier: BUSL-1.1
// Central Limit Order Book (CLOB) exchange
// (c) Long Gamma Labs, 2023.
pragma solidity ^0.8.26;


import {Trie} from "./Trie.sol";
import {ITrieFactory} from "./ITrieFactory.sol";


/// @title Trie Factory for  Protocol
/// @dev Factory for creating instances of Trie
contract TrieFactory is ITrieFactory {

    /// @dev Creates a new Trie
    /// @param lob The address to pass to the Trie constructor
    /// @return The address of the newly created Trie
    function createTrie(address lob) external returns (address) {
        Trie trie = new Trie(lob);
        return address(trie);
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Central Limit Order Book (CLOB) exchange
// (c) Long Gamma Labs, 2023.
pragma solidity ^0.8.26;


import {Errors} from "./Errors.sol";
import {ITrie} from "./ITrie.sol";


struct Node {
    uint64 left;
    uint64 right;
    uint64 total_shares_value_ptr;
}


struct Leaf {
    uint64 trader_id;
    uint128 remain_shares;
    uint64 initial_shares_value_ptr;
}


struct ExecutionResult {
    uint128 executed_shares;
    uint128 executed_value;
    uint128 total_shares;
    uint128 total_value;
    uint64 right_child;
    uint64 xor_map;
}


/// @title Trie data structure for  Protocol
/// @dev This contract implements a trie for efficient order management in an on-chain limit order book.
contract Trie is ITrie {
    address immutable lob_address;

    // Since we have a prefix tree, we can immediately get all the keys in the rightmost branch.
    // Each right key represents a part of best_offer, the length of which is determined
    // by the non-zero bit in rightmost_map.  That is, the number of non-zero bits 
    // in rightmost_map equals the number of nodes in the rightmost branch.
    uint64 public best_offer = 0;
    uint64 public rightmost_map = 0x0;
    // The rightmost branch is unique: it only stores the total_shares and total_amount of the left child,
    // so deleting or adding new nodes can start directly from the corresponding node on the rightmost branch.

    uint64 highest_allocated_pointer;
    uint64 last_free_pointer;

    mapping (uint64 => Leaf) leaves;
    mapping (uint64 => Node) nodes;
    mapping (uint64 => uint256) arena;

    modifier onlyLOBPermission() {
        require(msg.sender == lob_address, Errors.Forbidden());
        _;
    }

    constructor(address _lob_address) {
        lob_address = _lob_address;
    }

    /// @dev Adds an order to the order book.
    /// @param trader_id The ID of the trader placing the order, must be be greater than 0.
    /// @param order_id The ID of the order being placed, must be unique and be pointer to leaf.
    /// @param shares The total number of shares in the order, must be greater than 0.
    /// @param value The total value of the order, must be greater than 0.
    /// All restrictions on parameters must be satisfied by the logic of the LOB contract
    function addOrder(uint64 trader_id, uint64 order_id, uint128 shares, uint128 value) virtual public onlyLOBPermission {
        uint64 ptr = allocateMemory();
        saveSharesValueToArena(ptr, shares, value);
        
        leaves[order_id] = Leaf({
            trader_id: trader_id,
            remain_shares: shares,
            initial_shares_value_ptr: ptr
        });

        uint256 map = rightmost_map;

        if (map == 0x0) {
            // This means the trie is empty.
            best_offer = order_id;
            rightmost_map = 0x1;
            return;
        }

        // We climb the rightmost branch until we go through it all, which means we need to add a new root, 
        // or to a node that matches our added order_id.
        (uint64 node_id, bool success) = findRightmostMatchingNode(order_id);
        if (success) {
            // We found the node that matches order_id.
            addOrderToNodes(order_id, node_id, shares, value);
        } else {
            // We have reached the root of the tree, we need to add a new node,  which will become the new root 
            // of the tree. New node`s descendant will be new order_id leaf.

            // note: node_id here is the root node_id
            addOrderAndUpdateRoot(order_id, node_id, shares, value);
        }
    }

    /// @dev Removes an order with a specific order_id associated with a trader identified by order_trader_id.
    /// @param order_id The ID of the order to be removed.
    /// @param order_trader_id The ID of the trader associated with the order. 
    /// Only needed for verification purposes.
    /// @return total_shares The total number of shares for the order.
    /// @return remain_shares The remaining number of shares for the order.
    function removeOrder(uint64 order_id, uint64 order_trader_id) virtual public onlyLOBPermission 
        returns (uint128 total_shares, uint128 remain_shares) {
        Leaf memory leaf = leaves[order_id];

        require(leaf.trader_id != 0x0, Errors.EmptyOrderError());

        // An important validation check for the provided address. It prevents unauthorized order removal.
        require(leaf.trader_id == order_trader_id, Errors.WrongOwner());

        uint128 total_value;
        (total_shares, total_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);

        remain_shares = leaf.remain_shares;
        uint128 remain_value = uint128(uint256(remain_shares) * uint256(total_value) / uint256(total_shares));

        // To prevent double claims.
        delete leaves[order_id];
        freeMemory(leaf.initial_shares_value_ptr);

        uint64 local_best_offer = best_offer;
        if (order_id > local_best_offer) {
            return (total_shares, 0);
        }

        if (order_id == local_best_offer) {
            removeBestOffer();
            return (total_shares, remain_shares);
        }

        (uint64 node_id, bool success) = findRightmostMatchingNode(order_id);

        if (!success) {
            return (total_shares, 0);
        }

        bool found = removeOrderFromNodes(order_id, node_id, remain_shares, remain_value);
        if (found) {
            return (total_shares, remain_shares);
        } else {
            return (total_shares, 0);
        }
    }

    /// @dev Claims executed shares for an order with a specific order_id associated with a trader identified 
    /// by order_trader_id. This operation does not remove the order from the order book.
    /// @param order_id The ID of the order for which executed shares are being claimed.
    /// @param order_trader_id The ID of the trader associated with the order. 
    /// Only needed for verification purposes.
    /// @return executed_shares The number of executed shares for the order.
    /// @return remain_shares The remaining number of shares for the order after execution.
    function claimExecuted(uint64 order_id, uint64 order_trader_id) virtual public onlyLOBPermission
        returns (uint128 executed_shares, uint128 remain_shares) {
        Leaf memory leaf = leaves[order_id];

        if (leaf.trader_id == 0x0) {
            return (0, 0);
        }

        // An important validation check for the provided address. It prevents unauthorized order claim.
        require(leaf.trader_id == order_trader_id, Errors.WrongOwner());

        remain_shares = leaf.remain_shares;
        (uint128 total_shares, uint128 total_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);

        uint64 local_best_offer = best_offer;
        if (order_id > local_best_offer) {
            remain_shares = 0;
        } else {
            (uint64 node_id, bool success) = findRightmostMatchingNode(order_id);

            if (!success || !isOrderInTree(node_id, order_id)) {
                remain_shares = 0;
            }
        }

        executed_shares = total_shares - remain_shares;
        if (executed_shares == 0) {
            return (0, remain_shares);
        }

        if (remain_shares == 0) {
            delete leaves[order_id];
            freeMemory(leaf.initial_shares_value_ptr);
        } else {
            uint128 remain_value = uint128(
                uint256(remain_shares) * uint256(total_value) / uint256(total_shares)
            );
            saveSharesValueToArena(
                leaf.initial_shares_value_ptr,
                remain_shares,
                remain_value
            );
        }
    }

    /// @dev Retrieves information about an order based on the given order_id.
    /// @param order_id The ID of the order to retrieve information for.
    /// @return total_shares The total number of shares for the order.
    /// @return remain_shares The remaining number of shares for the order.
    /// Unlike removeOrder, it does not require the existence of an order and works even on claimed and canceled 
    /// orders, returning zeros.
    function getOrderInfo(uint64 order_id) public view 
        returns (uint128 total_shares, uint128 remain_shares) {
        Leaf memory leaf = leaves[order_id];

        if (leaf.trader_id == 0x0) {
            return (0, 0);
        }

        remain_shares = leaf.remain_shares;
        (total_shares, ) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);

        // works correctly in case of empty trie too: best_offer = 0x0
        if (order_id > best_offer) {
            return (total_shares, 0);
        }

        (uint64 node_id, bool success) = findRightmostMatchingNode(order_id);

        if (!success) { 
            return (total_shares, 0);
        }

        if (isOrderInTree(node_id, order_id)) {
            return (total_shares, remain_shares);
        } else {
            return (total_shares, 0);
        }
    }

    /// @dev Executes matching orders using a "right" approach, striving to fulfill orders 
    /// as much as possible towards the right side.
    /// @param order_id The price identifier of the order, not associated with a real order ID.
    /// @param order_total_shares The total number of shares for the order being executed.
    function executeRight(uint64 order_id, uint128 order_total_shares) virtual public onlyLOBPermission 
        returns (uint128 executed_shares, uint128 executed_value) {
        // Conceptually the most complex function in the contract.
        // Since we have to rebuild rightmost branch.

        uint64 local_best_offer = best_offer;

        // Works correctly in case of empty trie too: best_offer = 0x0
        if (order_id > local_best_offer) {
            return (0, 0);
        }

        // Here we climb up the rightmost branch, similar to how it happens in findRightmostMatchingNode.
        // But, unfortunately, here we can no longer limit yourself to just node_id, and we have to read the node 
        // completely. This happens because node_id contains information only about the price of orders, 
        // but not about volumes.

        // Starting with rightmost leaf.
        Leaf memory leaf = leaves[local_best_offer];
        (uint128 initial_shares, uint128 initial_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);
        uint128 remain_shares = leaf.remain_shares;

        if (order_total_shares < remain_shares) {
            executed_shares = order_total_shares;
            executed_value = uint128(uint256(executed_shares) * uint256(initial_value) / uint256(initial_shares));
                                                                    // initial_value / initial_shares is exact price
            unchecked {
                leaf.remain_shares -= executed_shares;
            }
            leaves[local_best_offer] = leaf;

            return (executed_shares, executed_value);
        }

        // Full execution of rightmost leaf.
        executed_shares = remain_shares;
        executed_value = uint128(uint256(remain_shares) * uint256(initial_value) / uint256(initial_shares));
        
        uint64 map = rightmost_map;
        (uint64 node_id, uint64 k) = calcNextRightMostNodeId(local_best_offer, map);

        uint64 xor_map = 0x1;

        // Now climbing on nodes.
        while (node_id != 0x0) {
            // We ascend along the rightmost branch from the bottom and attempt to execute the entire subtree at once.

            // Initially, we try to execute the order - the rightmost descendant.
            // Then, at each step, we essentially try to execute the entire subtree with the top at the left child
            // of the current node on the rightmost branch.

            // Since we have a prefix tree, we can guarantee that the keys of all descendants
            // of any node are not less than the key of the node itself. To improve this estimation, we can take
            // not the node_id of the node itself, but the node_id of its left child.

            xor_map ^= k;
            Node memory node = nodes[node_id];
            uint64 ptr = node.total_shares_value_ptr;
            (uint128 node_total_shares, uint128 node_total_value) = loadSharesValueFromArena(ptr);

            uint64 price_key = extractKeyFrom(node.left);
            
            // we can fully execute subtree if
            if (((order_id ^ 0x1) <= price_key)  
                    // all its leaves has higher or equal price than our order's price
                 && // (we are using price_key as lower bound) and
                (order_total_shares >= (node_total_shares + executed_shares))
                // it has less or equal shares than our order's
            ) {
                // full execution
                executed_shares += node_total_shares;
                executed_value += node_total_value;
                eraseNode(node_id, ptr);
            } else {
                ExecutionResult memory execution_result = executeRightRec(
                    order_id, node.left, (order_total_shares - executed_shares)
                );
                executed_shares += execution_result.executed_shares;
                executed_value += execution_result.executed_value;

                xor_map ^= execution_result.xor_map;
                if (execution_result.right_child != 0x0) {
                    // we are partially executed, dont need to execute anymore
                    (node_id, ) = calcNextRightMostNodeId(node_id, map);
                    if (node_id != 0x0) {
                        nodes[node_id].right = execution_result.right_child;
                    }
                    break;
                }
            }

            (node_id, k) = calcNextRightMostNodeId(node_id, map);
        }
 
        if (xor_map != 0x0) {
            // we have to change the rightmost map
            rightmost_map ^= xor_map;
            if (rightmost_map == 0x0) {
                best_offer = 0x0;
            }
        }
    }

    /// @dev Preview the execution of an order on the right.
    /// @param order_id The ID of the order to be executed.
    /// @param max_shares The maximum number of shares to execute.
    /// @param max_value The maximum value of shares to execute.
    /// @return executed_shares The number of shares executed.
    /// @return executed_value The value of the executed shares.
    function previewExecuteRight(uint64 order_id, uint128 max_shares, uint128 max_value) public view 
        returns (uint128 executed_shares, uint128 executed_value) {
        uint64 local_best_offer = best_offer;
        if (order_id > local_best_offer || max_shares == 0 || max_value == 0) {
            return (0, 0);
        }

        uint64 node_id = local_best_offer;
        uint64 k = 0x1;
        uint64 path_map = rightmost_map ^ 0x1;

        // This is a depth-first search implementation. Same idea in assembleOrderbookFromOrders.
        while (true) {
            if ((node_id & 0x1) == 0x1) {
                // leaf case
                (uint128 leaf_executed_shares, uint128 leaf_executed_value, bool full) = previewExecuteLeaf(
                    order_id,
                    node_id,
                    max_shares - executed_shares,
                    max_value - executed_value
                );
                executed_shares += leaf_executed_shares;
                executed_value += leaf_executed_value;

                if (!full) {
                    break;
                }
            } else {
                // node case
                (uint128 node_shares, uint128 node_value) = loadSharesValueFromArena(
                    nodes[node_id].total_shares_value_ptr
                );
                uint64 price_key = extractKeyFrom(nodes[node_id].left);

                // check if we can execute this node fully
                if (((order_id ^ 0x1) > price_key)
                    || ((max_shares - executed_shares) < node_shares)
                    || ((max_value - executed_value) < node_value)
                ) {
                    // we cant
                    unchecked {
                        k = ~(node_id - 1) & node_id;
                    }
                    path_map ^= k;
                    node_id = nodes[node_id].right;

                    continue;
                } else {
                    // we can
                    executed_shares += node_shares;
                    executed_value += node_value;
                }
            }

            (node_id, k) = calcNextRightMostNodeId(node_id, path_map);
            if (node_id == 0x0) {
                break;
            }
            path_map ^= k;

            node_id = nodes[node_id].left;
        }
    }

    /// @dev Assembles an order book from the orders in the trie.
    /// @param max_price_levels The maximum number of price levels to include in the order book.
    /// @return array_price_ids An array of price IDs for each level in the order book.
    /// @return array_shares An array of the total shares for each level in the order book.
    function assembleOrderbookFromOrders(uint24 max_price_levels) external view
        returns (uint24[] memory array_price_ids, uint128[] memory array_shares) {
        uint64 local_best_offer = best_offer;
        if (local_best_offer == 0x0 || max_price_levels == 0) {
            array_price_ids = new uint24[](0);
            array_shares = new uint128[](0);
            return (array_price_ids, array_shares);
        }

        array_price_ids = new uint24[](max_price_levels);
        array_shares = new uint128[](max_price_levels);

        array_price_ids[0] = uint24(local_best_offer >> 40);

        uint24 price_level = 0;

        uint64 node_id = local_best_offer;
        uint64 k = 0x1;
        uint64 path_map = rightmost_map ^ 0x1;

        // This is a depth-first search implementation. However, we don't start from the root, but 
        // from the far right element, as if we had already descended here.
        while (true) {
            if ((node_id & type(uint40).max) != 0x0) {
                uint24 c_price = uint24(node_id >> 40);

                if (c_price != array_price_ids[price_level]) {
                    ++price_level;
                    if (price_level == max_price_levels) {
                        return (array_price_ids, array_shares);
                    }
                    array_price_ids[price_level] = c_price;
                }
                
                (uint128 total_shares, ) = extractSharesValueForNode(node_id);
                array_shares[price_level] += total_shares;

                (node_id, k) = calcNextRightMostNodeId(node_id, path_map);
                if (node_id == 0x0) {
                    break;
                }
                path_map ^= k;

                node_id = nodes[node_id].left;  // this is why it works for rightmost branch nodes too
            } else {
                unchecked {
                    k = ~(node_id - 1) & node_id;
                }
                path_map ^= k;
                node_id = nodes[node_id].right;
            }
        }

        uint24 actual_length = price_level + 1;
        if (actual_length < max_price_levels) {
            // Cropping the returned arrays to their actual length.
            uint24[] memory cropped_array_price_ids = new uint24[](actual_length);
            uint128[] memory cropped_array_shares = new uint128[](actual_length);

            for(uint24 i = 0; i < actual_length; ++i) {
                cropped_array_price_ids[i] = array_price_ids[i];
                cropped_array_shares[i] = array_shares[i];
            }

            return (cropped_array_price_ids, cropped_array_shares);
        }
    }

    /// @dev Finds the rightmost node that matches the given order_id.
    /// @param order_id The ID of the order to find the matching node for.
    /// @return node_id The ID of the found node or root.
    /// @return success Indicates whether the search was successful.
    /// This algo finds the lowest node in branch that meets the given criteria.
    function findRightmostMatchingNode(uint64 order_id) internal view returns (uint64 node_id, bool success) {
        uint256 map = rightmost_map;
        uint64 local_best_offer = best_offer;

        // We climb the rightmost branch until we go through it all.
        uint256 mask = ~uint256(0x1);
        while (true) {
            if (((local_best_offer ^ order_id) & mask) == 0x0) {
                // We found the node that matches order_id.

                uint256 k = (~mask & (mask >> 1));
                // Extracts the bit that determines the length.
                // Shifting works correctly for the case of 64 bits.
                node_id = uint64((local_best_offer & mask) ^ k);

                return (node_id, true);
            }

            map = map & mask;
            if (map == 0x0) {
                // We have reached the root of the tree,

                uint256 k = (~mask & (mask >> 1));
                // Extracts the bit that determines the length.
                // Shifting works correctly for the case of 64 bits.
                uint64 root_node_id = uint64((local_best_offer & mask) ^ k);

                return (root_node_id, false);
            }

            unchecked {  // we just checked that map != 0
                mask = ~(map ^ (map - 1));
            }
        }
    }

    /// @dev Normalizes the branch of the tree up to the specified stop node.
    /// @param stop_node_id The ID of the node where normalization stops, must exist.
    /// @return extra_total_shares The total number of extra shares added during normalization.
    /// @return extra_total_value The total value associated with the extra shares added during normalization.
    /// @return new_rightmost_map The new rightmost map after normalization.
    function normalizeBranch(uint64 stop_node_id)
        internal returns (uint128 extra_total_shares, uint128 extra_total_value, uint64 new_rightmost_map) {

        uint256 map = rightmost_map;
        uint64 local_best_offer = best_offer;
        
        // loading leaf data
        Leaf memory leaf = leaves[local_best_offer];
        (uint128 initial_shares, uint128  initial_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);

        extra_total_shares = leaf.remain_shares;
        extra_total_value = uint128(uint256(extra_total_shares) * uint256(initial_value) / uint256(initial_shares));

        map ^= 0x1;

        if (stop_node_id == local_best_offer) {
            return (extra_total_shares, extra_total_value, uint64(map));
        }

        uint256 mask;
        unchecked {  // we are guaranteed to have a stop order higher
            mask = ~(map ^ (map - 1));
        }
        while (true) {
            uint256 k = (~mask & (mask >> 1));
            // Shifting works correctly for the case of 64 bits.
            map ^= k;

            uint64 node_id = uint64((local_best_offer & mask) ^ k);
            uint64 node_ptr = nodes[node_id].total_shares_value_ptr;
            (uint128 node_total_shares, uint128 node_total_value) = loadSharesValueFromArena(node_ptr);

            uint128 initial_total_shares = node_total_shares;
            uint128 initial_total_value = node_total_value;

            node_total_shares += extra_total_shares;
            node_total_value += extra_total_value;
            
            saveSharesValueToArena(node_ptr, node_total_shares, node_total_value);

            extra_total_shares += initial_total_shares;
            extra_total_value += initial_total_value;

            if (node_id == stop_node_id) {
                break;
            }

            unchecked {  // we are guaranteed to have a stop order higher
                mask = ~(map ^ (map - 1));
            }
        }

        new_rightmost_map = uint64(map);
    }

    /// @dev Converts the regular right branch to rightmost branch starting from the given start_node_id.
    /// @param start_node_id The starting node_id for the conversion. Must me on the rightmost branch.
    /// @return xor_map The XOR diff with rightmost map generated during the conversion.
    function convertToRightmost(uint64 start_node_id) internal returns (uint64 xor_map) {
        xor_map = 0x1;  // including leaf node

        uint64 node_id = start_node_id;
        Node memory node;

        while ((node_id & 0x1) != 0x1) {
            // untill we reach leaf
            node = nodes[node_id];
            uint64 ptr = node.total_shares_value_ptr;

            uint64 child_node_id = node.right;
            (uint128 child_shares, uint128 child_value) = extractSharesValueForNode(child_node_id);
            removeFromArenaValues(ptr, child_shares, child_value);

            uint64 k;
            unchecked {
                k = ~(node_id - 1) & node_id;
                // Extracts the bit that determines the length.
                // Valid node always is greater than 0.
            }
            xor_map ^= k;

            node_id = child_node_id;
        }

        best_offer = node_id;
    }

    /// @dev Updates root node and adds a new order as a descendant of new root.
    /// @param order_id The ID of the new order.
    /// @param root_node_id The ID of the root node in the tree.
    /// @param shares The number of shares for the new order.
    /// @param value The value associated with the new order.
    function addOrderAndUpdateRoot(uint64 order_id, uint64 root_node_id, uint128 shares, uint128 value) internal {
        uint64 extra_node_id = calcCommonParent(order_id, root_node_id);
        Node memory extra_node;

        uint64 extra_node_k;
        unchecked {
            extra_node_k = ~(extra_node_id - 1) & extra_node_id;
            // Extracts the bit that determines the length.
            // Valid node always is greater than 0.
        }

        uint64 free_ptr = allocateMemory();

        uint64 new_rightmost_map;
        if (root_node_id < order_id) {
            // inserting node to the right
            uint128 extra_total_shares;
            uint128 extra_total_value;

            (extra_total_shares, extra_total_value, new_rightmost_map) = normalizeBranch(root_node_id);
            saveSharesValueToArena(free_ptr, extra_total_shares, extra_total_value);
            extra_node = Node({
                left: root_node_id, 
                right: order_id,
                total_shares_value_ptr: free_ptr
            });

            new_rightmost_map ^= extra_node_k ^ 0x1;  // 0x1 for new leaf

            best_offer = order_id;
        } else {
            // inserting node to the left
            saveSharesValueToArena(free_ptr, shares, value);
            extra_node = Node({
                left: order_id,
                right: root_node_id,
                total_shares_value_ptr: free_ptr
            });
            new_rightmost_map = rightmost_map ^ extra_node_k;
        }

        rightmost_map = new_rightmost_map;
        nodes[extra_node_id] = extra_node;
    }

    /// @dev Adds an order to the nodes based on the provided order_id, node_id, shares, and value.
    /// @param order_id The ID of the order to add.
    /// @param node_id The ID of the node where the order should be added. Must be the lowest node in rightmost branch 
    /// that matches order_id.
    /// @param shares The number of shares for the order.
    /// @param value The value associated with the order.
    function addOrderToNodes(uint64 order_id, uint64 node_id, uint128 shares, uint128 value) internal {
        // we now for sure that node_id is not a leaf
        Node memory node = nodes[node_id];

        if (matchesNode(order_id, node.left)) {
            uint64 node_ptr = node.total_shares_value_ptr;
            addToArenaValues(node_ptr, shares, value);

            addOrderToNonRightmostNodeDescendants(node.left, order_id, shares, value);
            return;
        }  // node.right can't match order_id
           // so no "else" logic needs here

        // so we are inserting new node here, in current node
        uint64 extra_node_id;
        Node memory extra_node;
        uint64 free_ptr = allocateMemory();
        if (order_id < node_id) {
            uint64 node_ptr = node.total_shares_value_ptr;
            addToArenaValues(node_ptr, shares, value);

            extra_node_id = calcCommonParent(order_id, node.left);
            if (node.left > order_id) {
                extra_node = Node(order_id, node.left, free_ptr);
            } else {
                extra_node = Node(node.left, order_id, free_ptr);
            }
            (uint128 child_shares, uint128 child_value) = extractSharesValueForNode(node.left);
            saveSharesValueToArena(free_ptr, shares + child_shares, value + child_value);

            node.left = extra_node_id;
        } else {
            // here we must properly rebuild the rightmost branch
            extra_node_id = calcCommonParent(order_id, node.right);

            uint64 extra_node_k;
            unchecked {
                extra_node_k = ~(extra_node_id - 1) & extra_node_id;
                // Extracts the bit that determines the length.
                // Valid node always is greater than 0.
            }

            if (node.right > order_id) {
                saveSharesValueToArena(free_ptr, shares, value);
                extra_node = Node(order_id, node.right, free_ptr);
                rightmost_map ^= extra_node_k;
            } else {
                (uint128 extra_total_shares, uint128 extra_total_value, uint64 new_rightmost_map)
                 = normalizeBranch(node.right);

                rightmost_map = new_rightmost_map ^ extra_node_k ^ 0x1;  // 0x1 for new leaf;

                best_offer = order_id;

                saveSharesValueToArena(free_ptr, extra_total_shares, extra_total_value);
                extra_node = Node(node.right, order_id, free_ptr);
            }

            node.right = extra_node_id;
        }

        nodes[node_id] = node;
        nodes[extra_node_id] = extra_node;
    }

    /// @dev Adds an order to the descendants of a node that is not the rightmost node.
    /// @param node_id The ID of the node from which to start updating. It must match order_id.
    /// @param order_id The ID of the order to add.
    /// @param shares The total shares associated with the order.
    /// @param value The total value associated with the order.
    function addOrderToNonRightmostNodeDescendants(
        uint64 node_id, 
        uint64 order_id, 
        uint128 shares, 
        uint128 value
    ) internal {
        uint64 next_node_id;
        Node memory node;

        // Descending the tree starting from node_id until neither child matches order_id, 
        // indicating a new node insertion point.
        while (true) {
            node = nodes[node_id];

            uint64 ptr = node.total_shares_value_ptr;
            addToArenaValues(ptr, shares, value);

            if (matchesNode(order_id, node.left)) {
                next_node_id = node.left;
            } else if (matchesNode(order_id, node.right)) {
                next_node_id = node.right;
            } else {
                break;
            }

            node_id = next_node_id;
        }

        uint64 extra_node_id;
        Node memory extra_node;
        uint64 free_ptr = allocateMemory();
        uint64 child_node_id;
        if (order_id < node_id) {
            // Inserting new (extra) node to the left.
            extra_node_id = calcCommonParent(order_id, node.left);
            if (node.left > order_id) {
                extra_node = Node(order_id, node.left, free_ptr);
            } else {
                extra_node = Node(node.left, order_id, free_ptr);
            }

            child_node_id = node.left;

            node.left = extra_node_id;
        } else {
            // Inserting new (extra) node to the right.
            extra_node_id = calcCommonParent(order_id, node.right);
            if (node.right > order_id) {
                extra_node = Node(order_id, node.right, free_ptr);
            } else {
                extra_node = Node(node.right, order_id, free_ptr);
            }

            child_node_id = node.right;

            node.right = extra_node_id;
        }
        
        (uint128 child_shares, uint128 child_value) = extractSharesValueForNode(child_node_id);
        saveSharesValueToArena(free_ptr, shares + child_shares, value + child_value);

        nodes[node_id] = node;
        nodes[extra_node_id] = extra_node;
    }

    /// @dev Checks if a given order is present in the tree.
    /// @param node_id The ID of the starting node identifier from which the search begins.
    /// @param order_id The ID of the order to search for in the tree.
    /// @return isPresent A boolean value indicating whether the order is present in the tree.
    function isOrderInTree(uint64 node_id, uint64 order_id) internal view returns (bool isPresent) {
        if (node_id == order_id) {
            return true;
        }
        Node memory node;
        while (true) {
            node = nodes[node_id];
            if (node.left == order_id || node.right == order_id) {
                return true;
            }
            if (matchesNode(order_id, node.left)) {
                node_id = node.left;
            } else if (matchesNode(order_id, node.right)) {
                node_id = node.right;
            } else {
                return false;
            }
        }
    }

    /// @dev Removes best offer order and rebuild rightmost branch if needed.
    function removeBestOffer() internal {
        uint64 local_best_offer = best_offer;
        uint64 map = rightmost_map;

        if (map == 0x1) {
            // This means there is only one order in the trie.
            // We remove it and leave the trie empty.
            rightmost_map = 0x0;
            best_offer = 0x0;
            return;
        }

        // We need to find the parent node and remove it as well.
        // It exists because there are more than one leaf in the tree.
        map ^= 0x1;
        uint64 mask;
        unchecked {
            // map > 0 since there are more than one leaf in the tree
            mask = ~(map ^ (map - 1));
        }
        uint64 k = (((mask >> 1) | 0x8000000000000000) & ~mask);

        // Removing this node from rightmost map too.
        map ^= k;

        uint64 node_id = (local_best_offer & mask) ^ k;
        Node memory node = nodes[node_id];
        eraseNode(node_id, node.total_shares_value_ptr);

        uint64 new_right_child = node.left;

        // and we have new rightmost branch
        uint64 new_rightmost_map = map ^ convertToRightmost(new_right_child);
        rightmost_map = new_rightmost_map;

        // This means that the node being removed has no "grandfather" node.
        if (new_rightmost_map == 0x1) {
            return;
        }

        // We also need to update the right child of the ancestor's ancestor of our order, as we have just removed it.
        unchecked {
            // map > 0 since there are at least one more ancestor
            mask = ~(map ^ (map - 1));
        }
        k = (((mask >> 1) | 0x8000000000000000) & ~mask);
        node_id = (local_best_offer & mask) ^ k;

        nodes[node_id].right = new_right_child;
    }

    /// @dev Removes an order from the nodes based on the provided order_id, node_id, remaining shares, and remaining value.
    /// @param order_id The ID of the order to remove.
    /// @param node_id The ID of the node from which to remove the order.
    /// @param remain_shares The remaining shares of the order.
    /// @param remain_value The remaining value of the order.
    /// @return found Indicates if the order was found and removed.
    function removeOrderFromNodes(
        uint64 order_id,
        uint64 node_id,
        uint128 remain_shares,
        uint128 remain_value
    ) internal returns (bool found) {
        Node memory node = nodes[node_id];

        if (node.left == order_id) {
            eraseNode(node_id, node.total_shares_value_ptr);

            uint64 k;
            unchecked {
                // valid node_id is always greater than 0
                k = ~(node_id - 1) & node_id;
            }

            uint64 map = rightmost_map;
            rightmost_map = map ^ k;

            uint64 mask;
            unchecked {
                mask = ~(k ^ (k - 1));  // k > 0
            }
            map = map & mask;

            if (map == 0x0) {
                // same case in removeBestOffer - no "grandfather" node.
                return true;
            }

            unchecked {
                k = ~(map - 1) & map;  // we just checked that map > 0
                mask = ~(k ^ (k - 1)); // k > 0
            }

            uint64 new_right_child = node.right;

            node_id = (node_id & mask) ^ k;
            nodes[node_id].right = new_right_child;

            return true;
        }

        if (!matchesNode(order_id, node.left)) {
            return false;
        }

        uint64 returned_child;
        (found, returned_child) = removeOrderFromNonRightmostNodeDescendants(
            node.left, order_id, remain_shares, remain_value
        );
        if (found) {
            removeFromArenaValues(node.total_shares_value_ptr, remain_shares, remain_value);

            if (node.left != returned_child){
                node.left = returned_child;
                nodes[node_id] = node;
            }
        }
    }

    /// @dev Recursively removes an order from the descendants of a non-rightmost node.
    /// @param node_id The ID  of the current node being processed. Must be not a leaf.
    /// @param order_id The ID of the order to be removed.
    /// @param shares The number of shares associated with the order.
    /// @param value The value associated with the order.
    /// @return found Indicates if the order was found and removed.
    /// @return returned_child The identifier of the child node returned after removal.
    function removeOrderFromNonRightmostNodeDescendants(
        uint64 node_id, 
        uint64 order_id, 
        uint128 shares, 
        uint128 value
    ) internal returns (bool found, uint64 returned_child) {
        Node memory node = nodes[node_id];

        if (node.left == order_id) {
            eraseNode(node_id, node.total_shares_value_ptr);
            return (true, node.right);
        } else if (node.right == order_id) {
            eraseNode(node_id, node.total_shares_value_ptr);
            return (true, node.left);
        }

        if (matchesNode(order_id, node.left)) {
            (found, returned_child) = removeOrderFromNonRightmostNodeDescendants(node.left, order_id, shares, value);
            if (!found) {
                return (false, 0x0);
            }

            removeFromArenaValues(node.total_shares_value_ptr, shares, value);

            if (node.left != returned_child){
                node.left = returned_child;
                nodes[node_id] = node;
            }

            return (true, node_id);
        } else if (matchesNode(order_id, node.right)) {
            (found, returned_child) = removeOrderFromNonRightmostNodeDescendants(node.right, order_id, shares, value);
            if (!found) {
                return (false, 0x0);
            }

            removeFromArenaValues(node.total_shares_value_ptr, shares, value);

            if (node.left != returned_child){
                node.right = returned_child;
                nodes[node_id] = node;
            }

            return (true, node_id);
        } else {
            return (false, 0x0);
        }
    }

    /// @dev Extracts key and mask from a given node_id.
    /// @param node_id The ID of the node from which to extract key and mask.
    /// @return key The extracted key.
    /// @return mask The extracted mask.
    function extractKeyAndMaskFrom(uint64 node_id) internal pure returns (uint64 key, uint64 mask) {
        unchecked {
            // valid node_id is always greater than 0
            mask = ~((node_id - 1) ^ node_id);
        }
        key = node_id & mask;
        return (key, mask);
    }

    /// @dev Extracts key from a given node_id.
    /// @param node_id The ID of the node from which to extract key.
    /// @return key The extracted key.
    function extractKeyFrom(uint64 node_id) internal pure returns (uint64 key) {
        uint64 k;
        unchecked {
            // valid node_id is always greater than 0
            k = ~(node_id - 1) & node_id;
        }
        return node_id ^ k;
    }

    /// @dev Calculates the common parent node for a given order_id and node_id.
    /// @param order_id The ID of the order to calculate the common parent for.
    /// @param node_id The ID of the node to calculate the common parent for.
    /// @return The calculated common parent node.
    function calcCommonParent(uint64 order_id, uint64 node_id) internal pure returns (uint64) {
        uint64 key = extractKeyFrom(node_id);

        uint256 diff = (order_id ^ 0x1) ^ key;
        uint256 mask = ~uint256(type(uint64).max);

        uint256 t;
        t = mask >> 32; if ((t & diff) == 0x0) { mask = t; }
        t = mask >> 16; if ((t & diff) == 0x0) { mask = t; }
        t = mask >> 8; if ((t & diff) == 0x0) { mask = t; }
        t = mask >> 4; if ((t & diff) == 0x0) { mask = t; }
        t = mask >> 2; if ((t & diff) == 0x0) { mask = t; }
        t = mask >> 1; if ((t & diff) == 0x0) { mask = t; }

        uint256 k = ((mask >> 1) & ~mask);
        return uint64((order_id & mask) ^ k);
    }

    /// @dev Checks if the order_id is a descendant of the node_id.
    /// @param order_id The ID of the order to compare with the node_id.
    /// @param node_id The ID of the node to compare with the order_id.
    /// @return True if the order_id matches the node_id, false otherwise.
    function matchesNode(uint64 order_id, uint64 node_id) internal pure returns (bool) {
        uint64 mask;
        unchecked {
            // valid node_id is always greater than 0
            mask = ~((node_id - 1) ^ node_id);
        }
        return ((order_id ^ node_id) & mask) == 0x0;
    }

    /// @dev Erases the node with the specified node_id.
    /// @param node_id The ID of the node of the node to erase.
    function eraseNode(uint64 node_id, uint64 ptr) internal virtual {
        // Requires a more thoughtful strategy than just erasing everything.
        // if ((node_id & 0x1) != 0x1) {
        //     delete nodes[node_id];
        // }
        freeMemory(ptr);
    }

    /// @dev Recursively executes orders using a "right" approach within the order matching process.
    /// @param order_id The price identifier of the order, not necessarily associated with a real order ID.
    /// @param node_id The ID of the node within the order.
    /// @param rest_total_shares The remaining total shares to be executed.
    /// @return execution_result An ExecutionResult struct containing the result of the execution.
    function executeRightRec(uint64 order_id, uint64 node_id, uint128 rest_total_shares)
        internal returns (ExecutionResult memory execution_result) {

        if ((node_id & 0x1) == 0x1) {
            // leaf execution
            return executeLeaf(order_id, node_id, rest_total_shares);
        }

        // node execution
        Node memory node = nodes[node_id];
        uint64 node_ptr = node.total_shares_value_ptr;
        (uint128 node_shares, uint128 node_value) = loadSharesValueFromArena(node_ptr);

        // node.left != 0x0 since it node, not a leaf
        uint64 price_key = extractKeyFrom(node.left);

        // the same condition in executeRight 
        if (((order_id ^ 0x1) > price_key) || (rest_total_shares < node_shares)) {
            ExecutionResult memory right_execution_result = executeRightRec(order_id, node.right, rest_total_shares);
            rest_total_shares -= right_execution_result.executed_shares;

            if (right_execution_result.right_child != 0x0) {
                removeFromArenaValues(
                    node_ptr,
                    right_execution_result.total_shares + right_execution_result.executed_shares,
                    right_execution_result.total_value + right_execution_result.executed_value
                );
                if (node.right != right_execution_result.right_child) {
                    node.right = right_execution_result.right_child;
                    nodes[node_id] = node;
                }

                uint64 k;
                unchecked {
                    k = ~(node_id - 1) & node_id;
                    // Extracts the bit that determines the length.
                    // Valid node always is greater than 0.
                }

                execution_result = ExecutionResult({
                    executed_shares: right_execution_result.executed_shares,
                    executed_value: right_execution_result.executed_value,
                    total_shares: node_shares - right_execution_result.executed_shares,
                    total_value: node_value - right_execution_result.executed_value,
                    right_child: node_id,
                    xor_map: right_execution_result.xor_map ^ k
                });
            } else {
                execution_result = executeRightRec(order_id, node.left, rest_total_shares);
                execution_result.executed_shares += right_execution_result.executed_shares;
                execution_result.executed_value += right_execution_result.executed_value;
            }
        } else {
            // full execution
            execution_result = ExecutionResult({
                executed_shares: node_shares,
                executed_value: node_value,
                total_shares: 0,
                total_value: 0,
                right_child: 0x0,
                xor_map: 0x0
            });
            eraseNode(node_id, node_ptr);
        }
    }

    /// @dev Executes a leaf node within the order matching process.
    /// @param order_id The price identifier of the order, not associated with a real order ID.
    /// @param leaf_node_id The ID of the leaf node within the order.
    /// @param rest_total_shares The remaining total shares to be executed.
    /// @return execution_result An ExecutionResult struct containing the result of the execution.
    function executeLeaf(uint64 order_id, uint64 leaf_node_id, uint128 rest_total_shares) 
        internal returns (ExecutionResult memory execution_result) {
        Leaf memory leaf = leaves[leaf_node_id];
        (uint128 initial_shares, uint128 initial_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);
        uint128 remain_shares = leaf.remain_shares;
        uint128 remain_value = uint128(uint256(remain_shares) * uint256(initial_value) / uint256(initial_shares));

        if (leaf_node_id >= order_id) {  // both end on 0x1 bit, so we can compare them
            // we can execute current leaf
            if (remain_shares <= rest_total_shares) {
                // full execution
                execution_result = ExecutionResult({
                    executed_shares: remain_shares,
                    executed_value: remain_value,
                    total_shares: 0,
                    total_value: 0,
                    right_child: 0x0,
                    xor_map: 0x0
                });
            } else {
                // partial execution
                uint128 executed_shares = rest_total_shares;
                // Since the operation node.total_value = node.total_shares * price is expected,
                // the quotient will always be an integer.
                uint128 executed_value = uint128(uint256(rest_total_shares)
                     * uint256(remain_value) / uint256(remain_shares));
                     // remain_value / remain_shares = price

                unchecked {
                    leaf.remain_shares -= executed_shares;
                }
                leaves[leaf_node_id] = leaf;

                execution_result = ExecutionResult({
                    executed_shares: executed_shares,
                    executed_value: executed_value,
                    total_shares: remain_shares - executed_shares,
                    total_value: remain_value - executed_value,
                    right_child: leaf_node_id,
                    xor_map: 0x1
                });

                best_offer = leaf_node_id;
            }
        } else {
            // we can't execute current leaf at all
            execution_result = ExecutionResult({
                executed_shares: 0,
                executed_value: 0,
                total_shares: remain_shares,
                total_value: remain_value,
                right_child: leaf_node_id,
                xor_map: 0x1
            });

            best_offer = leaf_node_id;
        }

        // A brief comment explaining why in some cases we equate the best offer to the current leaf.
        // When executing multiple orders, only one of them may be partially executed. This partially executed order 
        // becomes the best offer.

        // An entirely unexecuted order becomes the best because our algorithm, encountering such behavior, 
        // stops trying to execute other orders - they are guaranteed to be worse. On the other hand, 
        // all better orders have already been fully executed.
    }

    /// @dev Preview the execution of a leaf node.
    /// @param order_id The ID of the order to be executed.
    /// @param leaf_node_id The ID of the leaf node to be executed.
    /// @param rest_shares The remaining shares of the order.
    /// @param rest_value The remaining value of shares of the order.
    /// @return executed_shares The number of shares executed.
    /// @return executed_value The value of the executed shares.
    /// @return full A boolean indicating whether the leaf was fully executed (true) or partially executed (false).
    function previewExecuteLeaf(uint64 order_id, uint64 leaf_node_id, uint128 rest_shares, uint128 rest_value) 
        internal view returns (uint128 executed_shares, uint128 executed_value, bool full) {
        Leaf memory leaf = leaves[leaf_node_id];
        (uint128 initial_shares, uint128 initial_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);
        uint128 leaf_shares = leaf.remain_shares;
        uint128 leaf_value = uint128(uint256(leaf_shares) * uint256(initial_value) / uint256(initial_shares));

        if (leaf_node_id >= order_id) {  // both end on 0x1 bit, so we can compare them
            // we can execute current leaf

            // The order of these checks is important and should not be changed.
            // We first check if we need to adjust shares based on value,
            // then we check if we need to adjust value based on shares.
            // This ensures correct handling of partial executions and rounding.

            if (rest_value < leaf_value) {
                uint128 shares = uint128(uint256(rest_value) * uint256(leaf_shares) / uint256(leaf_value));
                // note: This division may not result in an integer, and rounding down is implied
                if (shares < rest_shares) {
                    rest_shares = shares;
                }
            }

            if (rest_shares < leaf_shares) {
                uint128 value = uint128(uint256(rest_shares) * uint256(leaf_value) / uint256(leaf_shares));
                if (value < rest_value) {
                    rest_value = value;
                }
            }

            if (rest_shares < leaf_shares) {
                // partial execution
                return (rest_shares, rest_value, false);
            } else {
                // full execution
                return (leaf_shares, leaf_value, true);
            }
        } else {
            // we can't execute current leaf at all
            return (0, 0, false);
        }
    }

    /// @dev Calculates the next rightmost node ID and its associated k-bit based on the given node ID and map.
    /// @param node_id The node ID.
    /// @param map The map used for calculation.
    /// @return The next rightmost node ID and its associated k-bit.
    function calcNextRightMostNodeId(uint64 node_id, uint64 map) internal pure returns (uint64, uint64) {
        uint64 mask;
        unchecked {
            mask = ~(node_id ^ (node_id - 1));  // valid node_id is always greater than 0
            map &= mask;
        }
        if (map == 0x0) {
            return (0, 0);
        }
        unchecked {
            mask = ~(map ^ (map - 1));  // we just checker map > 0
        }
        uint64 k = (((mask >> 1) | 0x8000000000000000) & ~mask);
        
        return ((node_id & mask) ^ k, k);
    }

    /// @dev Packs two uint128 values into a single uint256.
    /// @param a The first uint128 value.
    /// @param b The second uint128 value.
    /// @return p The packed uint256 value.
    function packTwoUintsToWord(uint128 a, uint128 b) internal pure returns (uint256 p) {
        p = uint256(a) ^ (uint256(b) << 128);
    }

    /// @dev Unpacks a uint256 value into two uint128 values.
    /// @param p The packed uint256 value.
    /// @return a The first unpacked uint128 value.
    /// @return b The second unpacked uint128 value.
    function unPackTwoUintsFromWord(uint256 p) internal pure returns (uint128 a, uint128 b) {
        a = uint128(p & 0xffffffffffffffffffffffffffffffff);
        b = uint128(p >> 128);
    }

    /// @dev Allocates memory for storing data.
    /// @return ptr The pointer to the allocated memory.
    function allocateMemory() internal returns (uint64 ptr) {
        if (last_free_pointer == 0x0) {
            return (++highest_allocated_pointer);
        }
        ptr = last_free_pointer;
        last_free_pointer = uint64(arena[ptr]);
    }

    /// @dev Frees the memory at the given pointer.
    /// @param ptr The pointer to the memory to be freed.
    function freeMemory(uint64 ptr) internal {
        require(last_free_pointer != ptr, Errors.PointerAlreadyFreed());
        arena[ptr] = packTwoUintsToWord(last_free_pointer, 0x1);
        last_free_pointer = ptr;
    }

    /// @dev Saves the shares and value to the memory at the given pointer.
    /// @param ptr The pointer to the memory where the data will be saved.
    /// @param shares The shares to be saved.
    /// @param value The value to be saved.
    function saveSharesValueToArena(uint64 ptr, uint128 shares, uint128 value) internal {
        arena[ptr] = packTwoUintsToWord(shares, value);
    }

    /// @dev Loads the shares and value from the memory at the given pointer.
    /// @param ptr The pointer to the memory from where the data will be loaded.
    /// @return The shares and value loaded from the memory.
    function loadSharesValueFromArena(uint64 ptr) internal view returns (uint128, uint128) {
        return unPackTwoUintsFromWord(arena[ptr]);
    }

    /// @dev Adds shares and value to the data at the given pointer in memory.
    /// @param ptr The pointer to the memory where the data will be added.
    /// @param adding_shares The shares to be added.
    /// @param adding_value The value to be added.
    function addToArenaValues(uint64 ptr, uint128 adding_shares, uint128 adding_value) internal {
        (uint128 shares, uint128 value) = unPackTwoUintsFromWord(arena[ptr]);

        shares += adding_shares;
        value += adding_value;
        
        arena[ptr] = packTwoUintsToWord(shares, value);
    }

    /// @dev Removes shares and value from the data at the given pointer in memory.
    /// @param ptr The pointer to the memory from where the data will be removed.
    /// @param removing_shares The shares to be removed.
    /// @param removing_value The value to be removed.
    function removeFromArenaValues(uint64 ptr, uint128 removing_shares, uint128 removing_value) internal {
        (uint128 shares, uint128 value) = unPackTwoUintsFromWord(arena[ptr]);

        shares -= removing_shares;
        value -= removing_value;
        
        arena[ptr] = packTwoUintsToWord(shares, value);
    }

    /// @dev Extracts the shares and value for a given node.
    /// @param node_id The ID of the node.
    /// @return The shares and value for the node.
    function extractSharesValueForNode(uint64 node_id) internal view returns (uint128, uint128) {
        if ((node_id & 0x1) == 0x1) {
            // leaf case
            Leaf memory leaf = leaves[node_id];
            (uint128 initial_shares, uint128 initial_value) = loadSharesValueFromArena(leaf.initial_shares_value_ptr);
            uint128 remain_shares = leaf.remain_shares;
            uint128 remain_value = uint128(uint256(remain_shares) * uint256(initial_value) / uint256(initial_shares));
            return (remain_shares, remain_value);
        }

        uint64 ptr = nodes[node_id].total_shares_value_ptr;
        return loadSharesValueFromArena(ptr);
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Central Limit Order Book (CLOB) exchange
// (c) Long Gamma Labs, 2023.
pragma solidity ^0.8.26;


interface ITrieFactory {
    function createTrie(address lob) external returns (address);
}

// SPDX-License-Identifier: BUSL-1.1
// Central Limit Order Book (CLOB) exchange
// (c) Long Gamma Labs, 2023.
pragma solidity ^0.8.26;


contract Errors {
    error AddressIsZero();
    error ArrayLengthMismatch();
    error ChainIsUnstableForTrades();
    error ClaimNotAllowed();
    error CommissionParamTooHigh();
    error Disabled();
    error EmptyOrderError();
    error ExcessiveSignificantFigures();
    error Expired();
    error Forbidden();
    error FractionalNumbersNotAllowed();
    error InsufficientTokenXBalance();
    error InsufficientTokenYBalance();
    error InvalidCommissionRate();
    error InvalidFloatingPointRepresentation();
    error InvalidMarketMaker();
    error InvalidPriceRange();
    error InvalidTransfer();
    error MarketOnlyAndPostOnlyFlagsConflict();
    error MaxCommissionFailure();
    error NativeETHDisabled();
    error NonceExhaustedFailure();
    error NotImplementedYet();
    error OnlyOwnerCanCancelOrders();
    error PointerAlreadyFreed();
    error PriceExceedsMaximumAllowedValue();
    error TransferFailed();
    error UnknownOrderId();
    error UnknownTrader();
    error WrongOwner();
    error ZeroMaxDelayNotAllowed();
    error ZeroRecoveryTimeNotAllowed();
    error ZeroTokenTransferNotAllowed();
}

// SPDX-License-Identifier: BUSL-1.1
// Central Limit Order Book (CLOB) exchange
// (c) Long Gamma Labs, 2023.
pragma solidity ^0.8.26;


interface ITrie {
    function best_offer() external view returns (uint64);
    function rightmost_map() external view returns (uint64);
    function addOrder(uint64 trader_id, uint64 order_id, uint128 shares, uint128 value) external;
    function removeOrder(uint64 order_id, uint64 order_trader_id) external returns (uint128 total_shares, uint128 remain_shares);
    function claimExecuted(uint64 order_id, uint64 order_trader_id) external returns (uint128 executed_shares, uint128 remain_shares);
    function getOrderInfo(uint64 order_id) external view returns (uint128 total_shares, uint128 remain_shares);
    function executeRight(uint64 order_id, uint128 order_total_shares) external returns (uint128 executed_shares, uint128 executed_value);
    function previewExecuteRight(uint64 order_id, uint128 max_shares, uint128 max_value) external view returns (uint128 executed_shares, uint128 executed_value);
    function assembleOrderbookFromOrders(uint24 max_price_levels) external view returns (uint24[] memory array_price_ids, uint128[] memory array_shares);
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@solmate/src/=lib/solmate/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"lob","type":"address"}],"name":"createTrie","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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