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

/**
 * Analyze Menu for Modifier Patterns
 *
 * Parses item descriptions to detect modifier groups (size variants,
 * protein choices, add-ons, etc.) and suggests templates.
 *
 * POST JSON: { categories: [{ name, categoryNote, items: [{ name, description }] }] }
 */

$response = ['OK' => false];

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

    $categories = $data['categories'] ?? [];

    $detectedTemplates = [];
    $analyzedCategories = [];

    foreach ($categories as $cat) {
        $catName = $cat['name'] ?? '';
        $catNote = $cat['categoryNote'] ?? '';
        $items = $cat['items'] ?? [];

        // Check for category-wide patterns in the note
        $categoryTemplates = [];

        // "Add to any salad/item" pattern
        if (preg_match('/add\s+(?:the\s+following\s+)?to\s+any\s+(salad|item)/i', $catNote)) {
            if (preg_match('/add[^:]+:\s*(.+)/i', $catNote, $addOnMatch)) {
                $addOnText = $addOnMatch[1];
                $addOnItems = array_map('trim', explode(',', $addOnText));
                $templateID = 'cat_' . strtolower(preg_replace('/\W+/', '_', $catName)) . '_addons';

                if (!isset($detectedTemplates[$templateID])) {
                    $options = [['name' => 'None', 'price' => 0, 'isDefault' => true]];
                    foreach ($addOnItems as $addon) {
                        $addon = trim($addon);
                        if (!empty($addon)) {
                            $options[] = ['name' => $addon, 'price' => 0, 'isDefault' => false];
                        }
                    }
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Add Protein',
                        'options' => $options,
                        'required' => false,
                        'maxSelections' => 1,
                        'detectedFrom' => "Category note: $catName",
                        'appliesTo' => [],
                    ];
                }
                $categoryTemplates[] = $templateID;
            }
        }

        // Analyze each item
        $analyzedItems = [];
        foreach ($items as $item) {
            $itemName = $item['name'] ?? '';
            $itemDesc = $item['description'] ?? '';
            $itemMods = [];

            // Apply category-wide templates
            foreach ($categoryTemplates as $catTmpl) {
                $itemMods[] = $catTmpl;
                $detectedTemplates[$catTmpl]['appliesTo'][] = $itemName;
            }

            // Size patterns (small available)
            if (preg_match('/\bsmall\s*(available|option)?\b/i', $itemDesc) ||
                preg_match('/\bsmall\b/i', $itemName)) {
                $templateID = 'size_regular_small';
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Size',
                        'options' => [
                            ['name' => 'Regular', 'price' => 0, 'isDefault' => true],
                            ['name' => 'Small', 'price' => 0, 'isDefault' => false],
                        ],
                        'required' => true,
                        'maxSelections' => 1,
                        'detectedFrom' => "Pattern: 'Small available'",
                        'appliesTo' => [],
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            // Half order pattern
            if (preg_match('/\b(1\/2|half)\s*(order)?\s*(available)?\b/i', $itemDesc)) {
                $templateID = 'size_full_half';
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Size',
                        'options' => [
                            ['name' => 'Full Order', 'price' => 0, 'isDefault' => true],
                            ['name' => 'Half Order', 'price' => 0, 'isDefault' => false],
                        ],
                        'required' => true,
                        'maxSelections' => 1,
                        'detectedFrom' => "Pattern: '1/2 order available'",
                        'appliesTo' => [],
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            // Boneless or bone in
            if (preg_match('/\bboneless\s+(or|\/)\s*bone\s*-?\s*in\b/i', $itemDesc)) {
                $templateID = 'wing_style';
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Style',
                        'options' => [
                            ['name' => 'Bone-In', 'price' => 0, 'isDefault' => true],
                            ['name' => 'Boneless', 'price' => 0, 'isDefault' => false],
                        ],
                        'required' => true,
                        'maxSelections' => 1,
                        'detectedFrom' => "Pattern: 'Boneless or bone in'",
                        'appliesTo' => [],
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            // Protein add-on (With Chicken / With Steak or Shrimp)
            if (preg_match('/with\s+chicken.*(?:steak|shrimp)/i', $itemDesc)) {
                $templateID = 'protein_addon';
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Add Protein',
                        'options' => [
                            ['name' => 'Plain', 'price' => 0, 'isDefault' => true],
                            ['name' => 'With Chicken', 'price' => 0, 'isDefault' => false],
                            ['name' => 'With Steak or Shrimp', 'price' => 0, 'isDefault' => false],
                        ],
                        'required' => false,
                        'maxSelections' => 1,
                        'detectedFrom' => "Pattern: 'With Chicken / With Steak or Shrimp'",
                        'appliesTo' => [],
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            // "add X +$Y" pattern
            if (preg_match_all('/add\s+(\w+(?:\s+(?:and\s+)?\w+)?)\s*[.\+]?\s*(\d+(?:\.\d{2})?)/i', $itemDesc, $priceMatches)) {
                $templateID = 'addon_' . strtolower(preg_replace('/\W+/', '_', $itemName));
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Add-ons',
                        'options' => [],
                        'required' => false,
                        'maxSelections' => 0,
                        'detectedFrom' => "Pattern: 'Add X +\$Y' in $itemName",
                        'appliesTo' => [],
                        'needsPricing' => true,
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            // "with guacamole" pattern
            if (preg_match('/\bwith\s+guacamole\b/i', $itemDesc)) {
                $templateID = 'addon_guacamole';
                if (!isset($detectedTemplates[$templateID])) {
                    $detectedTemplates[$templateID] = [
                        'id' => $templateID,
                        'name' => 'Add Guacamole',
                        'options' => [
                            ['name' => 'No Guacamole', 'price' => 0, 'isDefault' => true],
                            ['name' => 'Add Guacamole', 'price' => 0, 'isDefault' => false],
                        ],
                        'required' => false,
                        'maxSelections' => 1,
                        'detectedFrom' => "Pattern: 'With guacamole'",
                        'appliesTo' => [],
                        'needsPricing' => true,
                    ];
                }
                $itemMods[] = $templateID;
                $detectedTemplates[$templateID]['appliesTo'][] = $itemName;
            }

            $analyzedItems[] = [
                'name' => $itemName,
                'description' => $itemDesc,
                'price' => $item['price'] ?? 0,
                'detectedModifiers' => $itemMods,
                'originalDescription' => $itemDesc,
            ];
        }

        $analyzedCategories[] = [
            'name' => $catName,
            'categoryNote' => $catNote,
            'items' => $analyzedItems,
            'categoryWideTemplates' => $categoryTemplates,
        ];
    }

    // Build template array sorted by usage count
    $templateArray = array_values($detectedTemplates);
    foreach ($templateArray as &$tmpl) {
        $tmpl['usageCount'] = count($tmpl['appliesTo']);
    }
    unset($tmpl);
    usort($templateArray, fn($a, $b) => $b['usageCount'] - $a['usageCount']);

    // Generate questions
    $questions = [];

    if (!empty($templateArray)) {
        $questions[] = [
            'type' => 'confirm_templates',
            'question' => 'I detected these modifier groups. Are they correct?',
            'templates' => $templateArray,
        ];
    }

    $itemsNeedingPrices = [];
    foreach ($analyzedCategories as $cat) {
        foreach ($cat['items'] as $item) {
            if (($item['price'] ?? 0) == 0) {
                $itemsNeedingPrices[] = ['category' => $cat['name'], 'item' => $item['name']];
            }
        }
    }
    if (!empty($itemsNeedingPrices)) {
        $questions[] = ['type' => 'pricing_needed', 'question' => 'These items need prices:', 'items' => $itemsNeedingPrices];
    }

    $templatesNeedingPrices = [];
    foreach ($templateArray as $tmpl) {
        if (!empty($tmpl['needsPricing'])) {
            $templatesNeedingPrices[] = [
                'templateId' => $tmpl['id'],
                'templateName' => $tmpl['name'],
                'appliesTo' => $tmpl['appliesTo'],
            ];
        }
    }
    if (!empty($templatesNeedingPrices)) {
        $questions[] = ['type' => 'modifier_pricing_needed', 'question' => 'These add-on options need prices:', 'templates' => $templatesNeedingPrices];
    }

    // Count totals
    $totalItems = 0;
    $totalLinks = 0;
    foreach ($analyzedCategories as $cat) {
        $totalItems += count($cat['items']);
        foreach ($cat['items'] as $item) {
            $totalLinks += count($item['detectedModifiers']);
        }
    }

    $response['OK'] = true;
    $response['analyzedMenu'] = [
        'categories' => $analyzedCategories,
        'detectedTemplates' => $templateArray,
        'totalItems' => $totalItems,
        'totalTemplates' => count($templateArray),
        'totalModifierLinks' => $totalLinks,
    ];
    $response['questions'] = $questions;
    $response['summary'] = "Analyzed $totalItems items, detected " . count($templateArray) . " modifier templates with $totalLinks links";

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

jsonResponse($response);