/**
 * Multi-Category Intelligence Detector
 *
 * Detects providers for each intelligence category independently:
 * - Products: Which provider serves product data
 * - Specials: Which provider serves deals/specials
 * - Brand: Which provider serves brand information
 * - Metadata: Which provider serves taxonomy/category data
 */

import { pool } from '../db/pool';
import { logger } from './logger';
import puppeteer, { Browser, Page } from 'puppeteer';

// ========================================
// Types
// ========================================

export type IntelligenceCategory = 'product' | 'specials' | 'brand' | 'metadata';

export type MenuProvider =
  | 'dutchie'
  | 'treez'
  | 'jane'
  | 'iheartjane'
  | 'weedmaps'
  | 'leafly'
  | 'meadow'
  | 'greenlight'
  | 'blaze'
  | 'flowhub'
  | 'dispense'
  | 'cova'
  | 'custom_html'
  | 'custom_json'
  | 'dutchie_json'
  | 'other'
  | 'unknown';

export interface CategoryDetectionResult {
  provider: MenuProvider;
  confidence: number;
  mode: 'production' | 'sandbox';
  signals: Record<string, any>;
  templateName?: string;
}

export interface MultiCategoryDetectionResult {
  product: CategoryDetectionResult;
  specials: CategoryDetectionResult;
  brand: CategoryDetectionResult;
  metadata: CategoryDetectionResult;
  urlsTested: string[];
  rawSignals: Record<string, any>;
}

// Production-ready providers per category
// Only these combinations can be set to production mode
const PRODUCTION_READY: Record<IntelligenceCategory, MenuProvider[]> = {
  product: ['dutchie'], // Only Dutchie products are production-ready
  specials: [],         // None yet
  brand: [],            // None yet
  metadata: [],         // None yet
};

// Provider detection patterns
const PROVIDER_PATTERNS: Record<string, {
  scripts: RegExp[];
  iframes: RegExp[];
  html: RegExp[];
  apiEndpoints: RegExp[];
  metaTags: RegExp[];
}> = {
  dutchie: {
    scripts: [
      /dutchie\.com/i,
      /dutchie-plus/i,
      /dutchie\.js/i,
      /__DUTCHIE__/i,
      /dutchie-embed/i,
    ],
    iframes: [
      /dutchie\.com/i,
      /dutchie-plus\.com/i,
      /embed\.dutchie/i,
    ],
    html: [
      /class="dutchie/i,
      /id="dutchie/i,
      /data-dutchie/i,
      /"menuType":\s*"dutchie"/i,
    ],
    apiEndpoints: [
      /dutchie\.com\/graphql/i,
      /plus\.dutchie\.com/i,
    ],
    metaTags: [
      /dutchie/i,
    ],
  },
  treez: {
    scripts: [
      /treez\.io/i,
      /treez-ecommerce/i,
      /treez\.js/i,
    ],
    iframes: [
      /treez\.io/i,
      /shop\.treez/i,
    ],
    html: [
      /class="treez/i,
      /data-treez/i,
      /treez-menu/i,
    ],
    apiEndpoints: [
      /api\.treez\.io/i,
      /treez\.io\/api/i,
    ],
    metaTags: [],
  },
  jane: {
    scripts: [
      /jane\.co/i,
      /iheartjane\.com/i,
      /jane-frame/i,
      /jane\.js/i,
    ],
    iframes: [
      /jane\.co/i,
      /iheartjane\.com/i,
      /embed\.iheartjane/i,
    ],
    html: [
      /class="jane/i,
      /data-jane/i,
      /jane-embed/i,
    ],
    apiEndpoints: [
      /api\.iheartjane/i,
      /jane\.co\/api/i,
    ],
    metaTags: [],
  },
  weedmaps: {
    scripts: [
      /weedmaps\.com/i,
      /wm-menu/i,
    ],
    iframes: [
      /weedmaps\.com/i,
      /menu\.weedmaps/i,
    ],
    html: [
      /data-weedmaps/i,
      /wm-menu/i,
    ],
    apiEndpoints: [
      /api-g\.weedmaps/i,
      /weedmaps\.com\/api/i,
    ],
    metaTags: [],
  },
  leafly: {
    scripts: [
      /leafly\.com/i,
      /leafly-menu/i,
    ],
    iframes: [
      /leafly\.com/i,
      /order\.leafly/i,
    ],
    html: [
      /data-leafly/i,
      /leafly-embed/i,
    ],
    apiEndpoints: [
      /api\.leafly/i,
    ],
    metaTags: [],
  },
};

// Category-specific detection signals
const CATEGORY_SIGNALS: Record<IntelligenceCategory, {
  urlPatterns: RegExp[];
  htmlPatterns: RegExp[];
  jsonKeys: string[];
}> = {
  product: {
    urlPatterns: [/\/menu/i, /\/products/i, /\/shop/i, /\/order/i],
    htmlPatterns: [/product-card/i, /menu-item/i, /product-list/i, /product-grid/i],
    jsonKeys: ['products', 'menuItems', 'items', 'inventory'],
  },
  specials: {
    urlPatterns: [/\/specials/i, /\/deals/i, /\/promotions/i, /\/offers/i],
    htmlPatterns: [/special/i, /deal/i, /promotion/i, /discount/i, /sale/i],
    jsonKeys: ['specials', 'deals', 'promotions', 'offers'],
  },
  brand: {
    urlPatterns: [/\/brands/i, /\/vendors/i, /\/producers/i],
    htmlPatterns: [/brand-list/i, /vendor/i, /producer/i, /manufacturer/i],
    jsonKeys: ['brands', 'vendors', 'producers', 'manufacturers'],
  },
  metadata: {
    urlPatterns: [/\/categories/i, /\/taxonomy/i],
    htmlPatterns: [/category-nav/i, /menu-categories/i, /filter-category/i],
    jsonKeys: ['categories', 'taxonomy', 'filters', 'types'],
  },
};

// ========================================
// Main Detection Function
// ========================================

export async function detectMultiCategoryProviders(
  websiteUrl: string,
  options: {
    timeout?: number;
    headless?: boolean;
    existingBrowser?: Browser;
  } = {}
): Promise<MultiCategoryDetectionResult> {
  const { timeout = 30000, headless = true, existingBrowser } = options;

  let browser: Browser | null = null;
  let page: Page | null = null;
  const urlsTested: string[] = [];
  const rawSignals: Record<string, any> = {};

  try {
    browser = existingBrowser || await puppeteer.launch({
      headless,
      args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'],
    });

    page = await browser.newPage();
    await page.setViewport({ width: 1920, height: 1080 });
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    // Navigate to main site
    const baseUrl = normalizeUrl(websiteUrl);
    urlsTested.push(baseUrl);

    await page.goto(baseUrl, { waitUntil: 'networkidle2', timeout });

    // Collect signals from main page
    const mainPageSignals = await collectPageSignals(page);
    rawSignals.mainPage = mainPageSignals;

    // Try common menu URLs
    const menuUrls = ['/menu', '/shop', '/products', '/order', '/specials', '/deals', '/brands'];
    for (const path of menuUrls) {
      try {
        const fullUrl = new URL(path, baseUrl).toString();
        urlsTested.push(fullUrl);
        await page.goto(fullUrl, { waitUntil: 'networkidle2', timeout: 15000 });
        const signals = await collectPageSignals(page);
        rawSignals[path] = signals;
      } catch {
        // URL doesn't exist or timed out
      }
    }

    // Analyze signals for each category
    const result: MultiCategoryDetectionResult = {
      product: analyzeCategorySignals('product', rawSignals),
      specials: analyzeCategorySignals('specials', rawSignals),
      brand: analyzeCategorySignals('brand', rawSignals),
      metadata: analyzeCategorySignals('metadata', rawSignals),
      urlsTested,
      rawSignals,
    };

    logger.info('provider-detection', `Multi-category detection complete for ${websiteUrl}`);
    return result;

  } catch (error: any) {
    logger.error('provider-detection', `Detection failed for ${websiteUrl}: ${error.message}`);

    // Return unknown results for all categories
    return {
      product: createUnknownResult(),
      specials: createUnknownResult(),
      brand: createUnknownResult(),
      metadata: createUnknownResult(),
      urlsTested,
      rawSignals: { error: error.message },
    };
  } finally {
    if (page) await page.close().catch(() => {});
    if (browser && !existingBrowser) await browser.close().catch(() => {});
  }
}

// ========================================
// Helper Functions
// ========================================

function normalizeUrl(url: string): string {
  if (!url.startsWith('http')) {
    url = 'https://' + url;
  }
  return url.replace(/\/$/, '');
}

async function collectPageSignals(page: Page): Promise<Record<string, any>> {
  return page.evaluate(() => {
    const signals: Record<string, any> = {
      scripts: [] as string[],
      iframes: [] as string[],
      links: [] as string[],
      metaTags: [] as string[],
      bodyClasses: document.body?.className || '',
      bodyId: document.body?.id || '',
      htmlSnippet: document.documentElement.outerHTML.slice(0, 10000),
    };

    // Collect script sources
    document.querySelectorAll('script[src]').forEach((el) => {
      signals.scripts.push((el as HTMLScriptElement).src);
    });

    // Collect inline scripts
    document.querySelectorAll('script:not([src])').forEach((el) => {
      const content = el.textContent || '';
      if (content.length < 5000) {
        signals.scripts.push(`inline:${content.slice(0, 500)}`);
      }
    });

    // Collect iframes
    document.querySelectorAll('iframe').forEach((el) => {
      signals.iframes.push(el.src);
    });

    // Collect links
    document.querySelectorAll('a[href]').forEach((el) => {
      signals.links.push((el as HTMLAnchorElement).href);
    });

    // Collect meta tags
    document.querySelectorAll('meta').forEach((el) => {
      const content = el.getAttribute('content') || '';
      const name = el.getAttribute('name') || el.getAttribute('property') || '';
      if (content || name) {
        signals.metaTags.push(`${name}:${content}`);
      }
    });

    // Look for JSON data
    const jsonBlocks: string[] = [];
    document.querySelectorAll('script[type="application/json"]').forEach((el) => {
      jsonBlocks.push(el.textContent?.slice(0, 2000) || '');
    });
    signals.jsonBlocks = jsonBlocks;

    return signals;
  });
}

function analyzeCategorySignals(
  category: IntelligenceCategory,
  allSignals: Record<string, any>
): CategoryDetectionResult {
  const providerScores: Record<MenuProvider, number> = {} as any;
  const detectedSignals: Record<string, any> = {};

  // Initialize scores
  for (const provider of Object.keys(PROVIDER_PATTERNS)) {
    providerScores[provider as MenuProvider] = 0;
  }

  // Analyze each page's signals
  for (const [pagePath, signals] of Object.entries(allSignals)) {
    if (!signals || typeof signals !== 'object') continue;

    // Check for provider-specific patterns
    for (const [provider, patterns] of Object.entries(PROVIDER_PATTERNS)) {
      let score = 0;

      // Check scripts
      if (signals.scripts) {
        for (const script of signals.scripts) {
          for (const pattern of patterns.scripts) {
            if (pattern.test(script)) {
              score += 20;
              detectedSignals[`${provider}_script_${pagePath}`] = script;
            }
          }
        }
      }

      // Check iframes
      if (signals.iframes) {
        for (const iframe of signals.iframes) {
          for (const pattern of patterns.iframes) {
            if (pattern.test(iframe)) {
              score += 25;
              detectedSignals[`${provider}_iframe_${pagePath}`] = iframe;
            }
          }
        }
      }

      // Check HTML content
      if (signals.htmlSnippet) {
        for (const pattern of patterns.html) {
          if (pattern.test(signals.htmlSnippet)) {
            score += 15;
            detectedSignals[`${provider}_html_${pagePath}`] = true;
          }
        }
      }

      providerScores[provider as MenuProvider] += score;
    }

    // Check for category-specific signals on relevant pages
    const categorySignals = CATEGORY_SIGNALS[category];
    const isRelevantPage = categorySignals.urlPatterns.some((p) => p.test(pagePath));

    if (isRelevantPage && signals.htmlSnippet) {
      for (const pattern of categorySignals.htmlPatterns) {
        if (pattern.test(signals.htmlSnippet)) {
          detectedSignals[`${category}_html_pattern`] = true;
        }
      }
    }

    // Check JSON blocks for category data
    if (signals.jsonBlocks) {
      for (const json of signals.jsonBlocks) {
        for (const key of categorySignals.jsonKeys) {
          if (json.toLowerCase().includes(`"${key}"`)) {
            detectedSignals[`${category}_json_key_${key}`] = true;
          }
        }
      }
    }
  }

  // Determine winning provider
  let bestProvider: MenuProvider = 'unknown';
  let bestScore = 0;

  for (const [provider, score] of Object.entries(providerScores)) {
    if (score > bestScore) {
      bestScore = score;
      bestProvider = provider as MenuProvider;
    }
  }

  // Calculate confidence (0-100)
  const confidence = Math.min(100, bestScore);

  // Determine mode based on provider and confidence
  const isProductionReady = PRODUCTION_READY[category].includes(bestProvider);
  const mode: 'production' | 'sandbox' = isProductionReady && confidence >= 70
    ? 'production'
    : 'sandbox';

  // Get template name if available
  let templateName: string | undefined;
  if (bestProvider === 'dutchie' && category === 'product') {
    templateName = 'dutchie_standard';
  } else if (bestProvider === 'treez') {
    templateName = 'treez_products_v0';
  }

  return {
    provider: bestProvider,
    confidence,
    mode,
    signals: detectedSignals,
    templateName,
  };
}

function createUnknownResult(): CategoryDetectionResult {
  return {
    provider: 'unknown',
    confidence: 0,
    mode: 'sandbox',
    signals: {},
  };
}

// ========================================
// Lightweight Per-Category Change Detection
// ========================================

export async function detectCategoryProviderChange(
  page: Page,
  category: IntelligenceCategory,
  expectedProvider: MenuProvider
): Promise<{ changed: boolean; newProvider?: MenuProvider; confidence?: number }> {
  try {
    const signals = await collectPageSignals(page);
    const result = analyzeCategorySignals(category, { currentPage: signals });

    if (result.provider !== expectedProvider && result.confidence > 50) {
      logger.warn(
        'provider-detection',
        `Provider change detected for ${category}: ${expectedProvider} -> ${result.provider}`
      );
      return {
        changed: true,
        newProvider: result.provider,
        confidence: result.confidence,
      };
    }

    return { changed: false };
  } catch (error: any) {
    logger.error('provider-detection', `Change detection failed: ${error.message}`);
    return { changed: false };
  }
}

// ========================================
// Database Operations
// ========================================

export async function updateDispensaryCategoryProvider(
  dispensaryId: number,
  category: IntelligenceCategory,
  result: CategoryDetectionResult
): Promise<void> {
  const columnPrefix = category === 'product' ? 'product' :
                       category === 'specials' ? 'specials' :
                       category === 'brand' ? 'brand' : 'metadata';

  await pool.query(
    `UPDATE dispensaries SET
      ${columnPrefix}_provider = $1,
      ${columnPrefix}_confidence = $2,
      ${columnPrefix}_crawler_mode = $3,
      ${columnPrefix}_detection_data = $4,
      updated_at = NOW()
     WHERE id = $5`,
    [
      result.provider,
      result.confidence,
      result.mode,
      JSON.stringify(result.signals),
      dispensaryId,
    ]
  );
}

export async function updateAllCategoryProviders(
  dispensaryId: number,
  result: MultiCategoryDetectionResult
): Promise<void> {
  await pool.query(
    `UPDATE dispensaries SET
      product_provider = $1,
      product_confidence = $2,
      product_crawler_mode = $3,
      product_detection_data = $4,
      specials_provider = $5,
      specials_confidence = $6,
      specials_crawler_mode = $7,
      specials_detection_data = $8,
      brand_provider = $9,
      brand_confidence = $10,
      brand_crawler_mode = $11,
      brand_detection_data = $12,
      metadata_provider = $13,
      metadata_confidence = $14,
      metadata_crawler_mode = $15,
      metadata_detection_data = $16,
      updated_at = NOW()
     WHERE id = $17`,
    [
      result.product.provider,
      result.product.confidence,
      result.product.mode,
      JSON.stringify(result.product.signals),
      result.specials.provider,
      result.specials.confidence,
      result.specials.mode,
      JSON.stringify(result.specials.signals),
      result.brand.provider,
      result.brand.confidence,
      result.brand.mode,
      JSON.stringify(result.brand.signals),
      result.metadata.provider,
      result.metadata.confidence,
      result.metadata.mode,
      JSON.stringify(result.metadata.signals),
      dispensaryId,
    ]
  );
}

export async function moveCategoryToSandbox(
  dispensaryId: number,
  category: IntelligenceCategory,
  reason: string
): Promise<void> {
  const columnPrefix = category === 'product' ? 'product' :
                       category === 'specials' ? 'specials' :
                       category === 'brand' ? 'brand' : 'metadata';

  await pool.query(
    `UPDATE dispensaries SET
      ${columnPrefix}_crawler_mode = 'sandbox',
      ${columnPrefix}_detection_data = ${columnPrefix}_detection_data || $1::jsonb,
      updated_at = NOW()
     WHERE id = $2`,
    [
      JSON.stringify({ sandbox_reason: reason, sandbox_at: new Date().toISOString() }),
      dispensaryId,
    ]
  );

  logger.info('provider-detection', `Moved dispensary ${dispensaryId} ${category} to sandbox: ${reason}`);
}