<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

/**
 * Save menu data from the builder UI
 *
 * POST body: { "BusinessID": 37, "Menu": { "categories": [...] } }
 */

// Track which templates we've already saved options for
$savedTemplates = [];

/**
 * Recursively save options/modifiers at any depth.
 */
function saveOptionsRecursive(array $options, int $parentID, int $businessID): void {
    $optSortOrder = 0;
    foreach ($options as $opt) {
        $optDbId = (int) ($opt['dbId'] ?? 0);
        $requiresSelection = (!empty($opt['requiresSelection'])) ? 1 : 0;
        $maxSelections = (int) ($opt['maxSelections'] ?? 0);
        $isDefault = (!empty($opt['isDefault'])) ? 1 : 0;
        $optionID = 0;

        if ($optDbId > 0) {
            $optionID = $optDbId;
            queryTimed("
                UPDATE Items
                SET Name = ?, Price = ?, IsCheckedByDefault = ?, SortOrder = ?,
                    RequiresChildSelection = ?, MaxNumSelectionReq = ?, ParentItemID = ?
                WHERE ID = ?
            ", [
                $opt['name'], (float) ($opt['price'] ?? 0), $isDefault, $optSortOrder,
                $requiresSelection, $maxSelections, $parentID, $optDbId,
            ]);
        } else {
            queryTimed("
                INSERT INTO Items (
                    BusinessID, ParentItemID, Name, Price,
                    IsCheckedByDefault, SortOrder, IsActive, AddedOn,
                    RequiresChildSelection, MaxNumSelectionReq, CategoryID
                ) VALUES (?, ?, ?, ?, ?, ?, 1, NOW(), ?, ?, 0)
            ", [
                $businessID, $parentID, $opt['name'], (float) ($opt['price'] ?? 0),
                $isDefault, $optSortOrder, $requiresSelection, $maxSelections,
            ]);
            $optionID = (int) lastInsertId();
        }

        if (!empty($opt['options']) && is_array($opt['options'])) {
            saveOptionsRecursive($opt['options'], $optionID, $businessID);
        }

        $optSortOrder++;
    }
}

$data = readJsonBody();
$businessID = (int) ($data['BusinessID'] ?? 0);
$menu = $data['Menu'] ?? [];

if ($businessID === 0) {
    jsonResponse(['OK' => false, 'ERROR' => 'BusinessID is required']);
}

if (!isset($menu['categories']) || !is_array($menu['categories'])) {
    jsonResponse(['OK' => false, 'ERROR' => 'Menu categories are required']);
}

try {
    // Determine schema
    $hasCategoriesData = false;
    try {
        $qCatCheck = queryOne("SELECT 1 as x FROM Categories WHERE BusinessID = ? LIMIT 1", [$businessID]);
        $hasCategoriesData = $qCatCheck !== null;
    } catch (Exception $e) {}
    $newSchemaActive = !$hasCategoriesData;

    $db = getDb();
    $db->beginTransaction();

    // Track JS category id -> DB categoryID for subcategory parent resolution
    $jsCatIdToDbId = [];

    $catSortOrder = 0;
    foreach ($menu['categories'] as $cat) {
        $categoryID = 0;
        $categoryDbId = (int) ($cat['dbId'] ?? 0);
        $categoryMenuId = (int) ($cat['menuId'] ?? 0);

        // Resolve parentCategoryID
        $parentCategoryID = 0;
        if (!empty($cat['parentCategoryDbId']) && (int) $cat['parentCategoryDbId'] > 0) {
            $parentCategoryID = (int) $cat['parentCategoryDbId'];
        } elseif (!empty($cat['parentCategoryId']) && $cat['parentCategoryId'] !== '0') {
            if (isset($jsCatIdToDbId[$cat['parentCategoryId']])) {
                $parentCategoryID = $jsCatIdToDbId[$cat['parentCategoryId']];
            }
        }

        if ($newSchemaActive) {
            if ($categoryDbId > 0) {
                $categoryID = $categoryDbId;
                queryTimed("
                    UPDATE Items SET Name = ?, SortOrder = ?
                    WHERE ID = ? AND BusinessID = ?
                ", [$cat['name'], $catSortOrder, $categoryID, $businessID]);
            } else {
                queryTimed("
                    INSERT INTO Items (BusinessID, Name, Description, ParentItemID, Price, IsActive, SortOrder, AddedOn, CategoryID)
                    VALUES (?, ?, '', 0, 0, 1, ?, NOW(), 0)
                ", [$businessID, $cat['name'], $catSortOrder]);
                $categoryID = (int) lastInsertId();
            }
        } else {
            if ($categoryDbId > 0) {
                $categoryID = $categoryDbId;
                queryTimed("
                    UPDATE Categories
                    SET Name = ?, SortOrder = ?, MenuID = NULLIF(?, 0), ParentCategoryID = ?
                    WHERE ID = ?
                ", [$cat['name'], $catSortOrder, $categoryMenuId, $parentCategoryID, $categoryID]);
            } else {
                queryTimed("
                    INSERT INTO Categories (BusinessID, MenuID, Name, SortOrder, ParentCategoryID, AddedOn)
                    VALUES (?, NULLIF(?, 0), ?, ?, ?, NOW())
                ", [$businessID, $categoryMenuId, $cat['name'], $catSortOrder, $parentCategoryID]);
                $categoryID = (int) lastInsertId();
            }
        }

        // Track JS id -> DB id
        if (!empty($cat['id'])) {
            $jsCatIdToDbId[$cat['id']] = $categoryID;
        }

        // Process items
        if (!empty($cat['items']) && is_array($cat['items'])) {
            $itemSortOrder = 0;
            foreach ($cat['items'] as $item) {
                $itemID = 0;
                $itemDbId = (int) ($item['dbId'] ?? 0);

                if ($itemDbId > 0) {
                    $itemID = $itemDbId;
                    if ($newSchemaActive) {
                        queryTimed("
                            UPDATE Items SET Name = ?, Description = ?, Price = ?, ParentItemID = ?, SortOrder = ?
                            WHERE ID = ?
                        ", [$item['name'], $item['description'] ?? '', (float) ($item['price'] ?? 0), $categoryID, $itemSortOrder, $itemID]);
                    } else {
                        queryTimed("
                            UPDATE Items SET Name = ?, Description = ?, Price = ?, CategoryID = ?, SortOrder = ?
                            WHERE ID = ?
                        ", [$item['name'], $item['description'] ?? '', (float) ($item['price'] ?? 0), $categoryID, $itemSortOrder, $itemID]);
                    }
                } else {
                    if ($newSchemaActive) {
                        queryTimed("
                            INSERT INTO Items (BusinessID, ParentItemID, Name, Description, Price, SortOrder, IsActive, AddedOn, CategoryID)
                            VALUES (?, ?, ?, ?, ?, ?, 1, NOW(), 0)
                        ", [$businessID, $categoryID, $item['name'], $item['description'] ?? '', (float) ($item['price'] ?? 0), $itemSortOrder]);
                    } else {
                        queryTimed("
                            INSERT INTO Items (BusinessID, CategoryID, Name, Description, Price, SortOrder, IsActive, ParentItemID, AddedOn)
                            VALUES (?, ?, ?, ?, ?, ?, 1, 0, NOW())
                        ", [$businessID, $categoryID, $item['name'], $item['description'] ?? '', (float) ($item['price'] ?? 0), $itemSortOrder]);
                    }
                    $itemID = (int) lastInsertId();
                }

                // Handle modifiers
                if (!empty($item['modifiers']) && is_array($item['modifiers'])) {
                    // Clear existing template links for this item
                    queryTimed("DELETE FROM lt_ItemID_TemplateItemID WHERE ItemID = ?", [$itemID]);

                    $modSortOrder = 0;
                    foreach ($item['modifiers'] as $mod) {
                        $modDbId = (int) ($mod['dbId'] ?? 0);
                        $requiresSelection = (!empty($mod['requiresSelection'])) ? 1 : 0;
                        $maxSelections = (int) ($mod['maxSelections'] ?? 0);

                        if (!empty($mod['isTemplate']) && $modDbId > 0) {
                            // Template reference — create link
                            queryTimed("
                                INSERT INTO lt_ItemID_TemplateItemID (ItemID, TemplateItemID, SortOrder)
                                VALUES (?, ?, ?)
                                ON DUPLICATE KEY UPDATE SortOrder = ?
                            ", [$itemID, $modDbId, $modSortOrder, $modSortOrder]);

                            // Update template name and selection rules
                            queryTimed("
                                UPDATE Items SET Name = ?, RequiresChildSelection = ?, MaxNumSelectionReq = ?
                                WHERE ID = ?
                            ", [$mod['name'], $requiresSelection, $maxSelections, $modDbId]);

                            // Save template options only once
                            if (!isset($savedTemplates[$modDbId])) {
                                $savedTemplates[$modDbId] = true;
                                if (!empty($mod['options']) && is_array($mod['options'])) {
                                    saveOptionsRecursive($mod['options'], $modDbId, $businessID);
                                }
                            }

                        } elseif ($modDbId > 0) {
                            // Direct modifier — update
                            $isDefault = (!empty($mod['isDefault'])) ? 1 : 0;
                            queryTimed("
                                UPDATE Items
                                SET Name = ?, Price = ?, IsCheckedByDefault = ?, SortOrder = ?,
                                    RequiresChildSelection = ?, MaxNumSelectionReq = ?, ParentItemID = ?
                                WHERE ID = ?
                            ", [
                                $mod['name'], (float) ($mod['price'] ?? 0), $isDefault, $modSortOrder,
                                $requiresSelection, $maxSelections, $itemID, $modDbId,
                            ]);

                            if (!empty($mod['options']) && is_array($mod['options'])) {
                                saveOptionsRecursive($mod['options'], $modDbId, $businessID);
                            }

                        } else {
                            // New direct modifier — insert
                            $isDefault = (!empty($mod['isDefault'])) ? 1 : 0;
                            queryTimed("
                                INSERT INTO Items (
                                    BusinessID, ParentItemID, Name, Price,
                                    IsCheckedByDefault, SortOrder, IsActive, AddedOn,
                                    RequiresChildSelection, MaxNumSelectionReq, CategoryID
                                ) VALUES (?, ?, ?, ?, ?, ?, 1, NOW(), ?, ?, 0)
                            ", [
                                $businessID, $itemID, $mod['name'], (float) ($mod['price'] ?? 0),
                                $isDefault, $modSortOrder, $requiresSelection, $maxSelections,
                            ]);

                            $newModID = (int) lastInsertId();
                            if (!empty($mod['options']) && is_array($mod['options'])) {
                                saveOptionsRecursive($mod['options'], $newModID, $businessID);
                            }
                        }
                        $modSortOrder++;
                    }
                }
                $itemSortOrder++;
            }
        }
        $catSortOrder++;
    }

    $db->commit();

    jsonResponse(['OK' => true, 'SCHEMA' => $newSchemaActive ? 'unified' : 'legacy']);

} catch (Exception $e) {
    try { $db->rollBack(); } catch (Exception $re) {}
    jsonResponse(['OK' => false, 'ERROR' => $e->getMessage(), 'DETAIL' => '', 'TYPE' => '']);
}