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

/**
 * Import Business from Scraped Data
 *
 * Creates a complete business with categories, items, modifier templates,
 * and template links via lt_ItemID_TemplateItemID.
 *
 * POST JSON: { business, categories, modifierTemplates, ownerUserID, dryRun }
 */

$response = ['OK' => false, 'steps' => [], 'errors' => [], 'warnings' => []];

try {
    $data = readJsonBody();
    if (empty($data)) throw new Exception('No request body provided');

    $dryRun = !empty($data['dryRun']);
    if ($dryRun) $response['steps'][] = 'DRY RUN MODE - no changes will be made';

    if (empty($data['business']['name'])) throw new Exception('business.name is required');

    $biz = $data['business'];
    $ownerUserID = (int)($data['ownerUserID'] ?? 1);

    // Step 1: Create or find business
    $response['steps'][] = 'Step 1: Creating business record...';

    $qCheck = queryTimed("SELECT ID FROM Businesses WHERE Name = ? LIMIT 1", [$biz['name']]);

    if (!empty($qCheck)) {
        $businessID = (int)$qCheck[0]['ID'];
        $response['steps'][] = "Business already exists with ID: $businessID";
        $response['warnings'][] = 'Existing business found - will add to existing menu';
    } elseif (!$dryRun) {
        queryTimed(
            "INSERT INTO Businesses (Name, UserID, AddressID, DeliveryZIPCodes, AddedOn) VALUES (?, ?, 0, '', NOW())",
            [$biz['name'], $ownerUserID]
        );
        $businessID = (int)lastInsertId();
        $response['steps'][] = "Created business with ID: $businessID";
    } else {
        $businessID = 0;
        $response['steps'][] = 'Would create business: ' . $biz['name'];
    }

    // Step 2: Create modifier templates
    $response['steps'][] = 'Step 2: Creating modifier templates...';

    $templateMap = []; // Maps template string ID to database ItemID
    $templates = $data['modifierTemplates'] ?? [];

    foreach ($templates as $tmpl) {
        $templateStringID = $tmpl['id'];
        $templateName = $tmpl['name'];
        $required = !empty($tmpl['required']);
        $maxSelections = (int)($tmpl['maxSelections'] ?? 0);

        if (!$dryRun) {
            $qTmpl = queryOne(
                "SELECT ID FROM Items WHERE BusinessID = ? AND Name = ? AND ParentItemID = 0 AND ID IN (SELECT TemplateItemID FROM lt_ItemID_TemplateItemID)",
                [$businessID, $templateName]
            );

            if ($qTmpl) {
                $templateItemID = (int)$qTmpl['ID'];
                $response['steps'][] = "Template exists: $templateName (ID: $templateItemID)";
            } else {
                queryTimed(
                    "INSERT INTO Items (BusinessID, Name, ParentItemID, Price, IsActive, RequiresChildSelection, MaxNumSelectionReq, SortOrder, IsCollapsible) VALUES (?, ?, 0, 0, 1, ?, ?, 0, 1)",
                    [$businessID, $templateName, $required ? 1 : 0, $maxSelections]
                );
                $templateItemID = (int)lastInsertId();
                $response['steps'][] = "Created template: $templateName (ID: $templateItemID)";
            }

            $templateMap[$templateStringID] = $templateItemID;

            // Create template options
            $options = $tmpl['options'] ?? [];
            $optionOrder = 1;
            foreach ($options as $opt) {
                $optName = $opt['name'];
                $optPrice = (float)($opt['price'] ?? 0);
                $optDefault = !empty($opt['isDefault']);

                $qOpt = queryOne(
                    "SELECT ID FROM Items WHERE BusinessID = ? AND Name = ? AND ParentItemID = ?",
                    [$businessID, $optName, $templateItemID]
                );

                if (!$qOpt) {
                    queryTimed(
                        "INSERT INTO Items (BusinessID, Name, ParentItemID, Price, IsActive, IsCheckedByDefault, SortOrder) VALUES (?, ?, ?, ?, 1, ?, ?)",
                        [$businessID, $optName, $templateItemID, $optPrice, $optDefault ? 1 : 0, $optionOrder]
                    );
                }
                $optionOrder++;
            }
        } else {
            $response['steps'][] = "Would create template: $templateName with " . count($tmpl['options'] ?? []) . " options";
            $templateMap[$templateStringID] = 0;
        }
    }

    // Step 3: Create categories
    $response['steps'][] = 'Step 3: Creating categories...';

    $categoryMap = [];
    $categories = $data['categories'] ?? [];
    $catOrder = 1;

    foreach ($categories as $cat) {
        $catName = $cat['name'];

        if (!$dryRun) {
            $qCat = queryOne(
                "SELECT ID FROM Items WHERE BusinessID = ? AND Name = ? AND ParentItemID = 0 AND ID NOT IN (SELECT TemplateItemID FROM lt_ItemID_TemplateItemID)",
                [$businessID, $catName]
            );

            if ($qCat) {
                $categoryItemID = (int)$qCat['ID'];
                $response['steps'][] = "Category exists: $catName";
            } else {
                queryTimed(
                    "INSERT INTO Items (BusinessID, Name, ParentItemID, Price, IsActive, SortOrder) VALUES (?, ?, 0, 0, 1, ?)",
                    [$businessID, $catName, $catOrder]
                );
                $categoryItemID = (int)lastInsertId();
                $response['steps'][] = "Created category: $catName (ID: $categoryItemID)";
            }

            $categoryMap[$catName] = $categoryItemID;
        } else {
            $response['steps'][] = "Would create category: $catName";
            $categoryMap[$catName] = 0;
        }
        $catOrder++;
    }

    // Step 4: Create menu items
    $response['steps'][] = 'Step 4: Creating menu items...';

    $totalItems = 0;
    $totalLinks = 0;

    foreach ($categories as $cat) {
        $catName = $cat['name'];
        $categoryItemID = $categoryMap[$catName];
        $items = $cat['items'] ?? [];
        $itemOrder = 1;

        foreach ($items as $item) {
            $itemName = $item['name'];
            $itemDesc = $item['description'] ?? '';
            $itemPrice = (float)($item['price'] ?? 0);

            if (!$dryRun) {
                $qItem = queryOne(
                    "SELECT ID FROM Items WHERE BusinessID = ? AND Name = ? AND ParentItemID = ?",
                    [$businessID, $itemName, $categoryItemID]
                );

                if ($qItem) {
                    $menuItemID = (int)$qItem['ID'];
                } else {
                    queryTimed(
                        "INSERT INTO Items (BusinessID, Name, Description, ParentItemID, Price, IsActive, SortOrder) VALUES (?, ?, ?, ?, ?, 1, ?)",
                        [$businessID, $itemName, $itemDesc, $categoryItemID, $itemPrice, $itemOrder]
                    );
                    $menuItemID = (int)lastInsertId();
                }

                // Link modifier templates
                $modifiers = $item['modifiers'] ?? [];
                $modOrder = 1;
                foreach ($modifiers as $modRef) {
                    if (isset($templateMap[$modRef])) {
                        $templateItemID = $templateMap[$modRef];
                        $qLink = queryOne(
                            "SELECT 1 FROM lt_ItemID_TemplateItemID WHERE ItemID = ? AND TemplateItemID = ?",
                            [$menuItemID, $templateItemID]
                        );
                        if (!$qLink) {
                            queryTimed(
                                "INSERT INTO lt_ItemID_TemplateItemID (ItemID, TemplateItemID, SortOrder) VALUES (?, ?, ?)",
                                [$menuItemID, $templateItemID, $modOrder]
                            );
                            $totalLinks++;
                        }
                        $modOrder++;
                    } else {
                        $response['warnings'][] = "Unknown modifier reference: $modRef on item: $itemName";
                    }
                }
            }

            $totalItems++;
            $itemOrder++;
        }
    }

    $response['steps'][] = "Created $totalItems menu items with $totalLinks template links";

    $response['OK'] = true;
    $response['summary'] = [
        'businessID' => $businessID,
        'businessName' => $biz['name'],
        'categoriesCreated' => count($categories),
        'templatesCreated' => count($templates),
        'itemsCreated' => $totalItems,
        'templateLinksCreated' => $totalLinks,
        'dryRun' => $dryRun,
    ];

    $response['steps'][] = $dryRun ? 'DRY RUN COMPLETE - no changes were made' : 'IMPORT COMPLETE!';

} catch (Exception $e) {
    $response['errors'][] = $e->getMessage();
}

jsonResponse($response);