/**
 * Dutchie Discovery Crawler
 *
 * Main orchestrator for the Dutchie store discovery pipeline.
 *
 * AUTOMATED FLOW (as of 2025-01):
 * 1. Fetch cities dynamically from Dutchie GraphQL (getAllCitiesByState)
 * 2. For each city, discover store locations via ConsumerDispensaries query
 * 3. Upsert locations to dutchie_discovery_locations (keyed by platform_location_id)
 * 4. AUTO-VALIDATE: Check required fields (name, city, state, platform_menu_url, platform_location_id)
 * 5. AUTO-PROMOTE: Valid locations are upserted to dispensaries table with crawl_enabled=true
 * 6. All actions logged to dutchie_promotion_log for audit
 *
 * Tables involved:
 * - dutchie_discovery_cities: Known cities for each state
 * - dutchie_discovery_locations: Raw discovered store data
 * - dispensaries: Canonical store records (promoted from discovery)
 * - dutchie_promotion_log: Audit trail for validation/promotion
 *
 * Usage:
 *   npx tsx src/scripts/run-discovery.ts discover:state AZ
 *   npx tsx src/scripts/run-discovery.ts discover:state CA
 */

import { Pool } from 'pg';
import {
  FullDiscoveryResult,
  LocationDiscoveryResult,
  DiscoveryCity,
} from './types';
import {
  discoverCities,
  getCitiesToCrawl,
  getCityBySlug,
  seedKnownCities,
} from './city-discovery';
import {
  discoverLocationsForCity,
  getCitiesForState,
} from './location-discovery';
import { promoteDiscoveredLocations } from './promotion';

// ============================================================
// FULL DISCOVERY
// ============================================================

export interface DiscoveryCrawlerOptions {
  dryRun?: boolean;
  verbose?: boolean;
  stateCode?: string;
  countryCode?: string;
  cityLimit?: number;
  skipCityDiscovery?: boolean;
  onlyStale?: boolean;
  staleDays?: number;
}

/**
 * Run the full discovery pipeline:
 * 1. Discover/refresh cities
 * 2. For each city, discover locations
 */
export async function runFullDiscovery(
  pool: Pool,
  options: DiscoveryCrawlerOptions = {}
): Promise<FullDiscoveryResult> {
  const startTime = Date.now();
  const {
    dryRun = false,
    verbose = false,
    stateCode,
    countryCode = 'US',
    cityLimit = 50,
    skipCityDiscovery = false,
    onlyStale = true,
    staleDays = 7,
  } = options;

  console.log('='.repeat(60));
  console.log('DUTCHIE DISCOVERY CRAWLER');
  console.log('='.repeat(60));
  console.log(`Mode: ${dryRun ? 'DRY RUN' : 'LIVE'}`);
  if (stateCode) console.log(`State: ${stateCode}`);
  console.log(`Country: ${countryCode}`);
  console.log(`City limit: ${cityLimit}`);
  console.log('');

  // Step 1: Discover/refresh cities
  let cityResult = {
    citiesFound: 0,
    citiesUpserted: 0,
    citiesSkipped: 0,
    errors: [] as string[],
    durationMs: 0,
  };

  if (!skipCityDiscovery) {
    console.log('[Discovery] Step 1: Discovering cities...');
    cityResult = await discoverCities(pool, { dryRun, verbose });
  } else {
    console.log('[Discovery] Step 1: Skipping city discovery (using existing cities)');
  }

  // Step 2: Get cities to crawl
  console.log('[Discovery] Step 2: Getting cities to crawl...');
  const cities = await getCitiesToCrawl(pool, {
    stateCode,
    countryCode,
    limit: cityLimit,
    onlyStale,
    staleDays,
  });

  console.log(`[Discovery] Found ${cities.length} cities to crawl`);

  // Step 3: Discover locations for each city
  console.log('[Discovery] Step 3: Discovering locations...');
  const locationResults: LocationDiscoveryResult[] = [];
  let totalLocationsFound = 0;
  let totalLocationsUpserted = 0;

  for (let i = 0; i < cities.length; i++) {
    const city = cities[i];
    console.log(`\n[Discovery] City ${i + 1}/${cities.length}: ${city.cityName}, ${city.stateCode}`);

    try {
      const result = await discoverLocationsForCity(pool, city, { dryRun, verbose });
      locationResults.push(result);
      totalLocationsFound += result.locationsFound;
      totalLocationsUpserted += result.locationsUpserted;

      // Rate limiting between cities
      if (i < cities.length - 1) {
        await new Promise((r) => setTimeout(r, 2000));
      }
    } catch (error: any) {
      console.error(`[Discovery] Error crawling ${city.cityName}: ${error.message}`);
      locationResults.push({
        cityId: city.id,
        citySlug: city.citySlug,
        locationsFound: 0,
        locationsUpserted: 0,
        locationsNew: 0,
        locationsUpdated: 0,
        errors: [error.message],
        durationMs: 0,
      });
    }
  }

  const durationMs = Date.now() - startTime;

  // Summary
  console.log('\n' + '='.repeat(60));
  console.log('DISCOVERY COMPLETE');
  console.log('='.repeat(60));
  console.log(`Duration: ${(durationMs / 1000).toFixed(1)}s`);
  console.log('');
  console.log('Cities:');
  console.log(`  Discovered: ${cityResult.citiesFound}`);
  console.log(`  Upserted: ${cityResult.citiesUpserted}`);
  console.log(`  Crawled: ${cities.length}`);
  console.log('');
  console.log('Locations:');
  console.log(`  Found: ${totalLocationsFound}`);
  console.log(`  Upserted: ${totalLocationsUpserted}`);
  console.log('');

  const totalErrors = cityResult.errors.length +
    locationResults.reduce((sum, r) => sum + r.errors.length, 0);
  if (totalErrors > 0) {
    console.log(`Errors: ${totalErrors}`);
  }

  // Step 4: Auto-validate and promote discovered locations
  if (!dryRun && totalLocationsUpserted > 0) {
    console.log('\n[Discovery] Step 4: Auto-promoting discovered locations...');
    const promotionResult = await promoteDiscoveredLocations(stateCode, false);
    console.log(`[Discovery] Promotion complete:`);
    console.log(`  Created: ${promotionResult.created} new dispensaries`);
    console.log(`  Updated: ${promotionResult.updated} existing dispensaries`);
    console.log(`  Rejected: ${promotionResult.rejected} (validation failed)`);
    if (promotionResult.rejectedRecords.length > 0) {
      console.log(`  Rejection reasons:`);
      promotionResult.rejectedRecords.slice(0, 5).forEach(r => {
        console.log(`    - ${r.name}: ${r.errors.join(', ')}`);
      });
      if (promotionResult.rejectedRecords.length > 5) {
        console.log(`    ... and ${promotionResult.rejectedRecords.length - 5} more`);
      }
    }
  }

  return {
    cities: cityResult,
    locations: locationResults,
    totalLocationsFound,
    totalLocationsUpserted,
    durationMs,
  };
}

// ============================================================
// SINGLE CITY DISCOVERY
// ============================================================

/**
 * Discover locations for a single city by slug.
 */
export async function discoverCity(
  pool: Pool,
  citySlug: string,
  options: {
    stateCode?: string;
    countryCode?: string;
    dryRun?: boolean;
    verbose?: boolean;
  } = {}
): Promise<LocationDiscoveryResult | null> {
  const { stateCode, countryCode = 'US', dryRun = false, verbose = false } = options;

  // Find the city
  let city = await getCityBySlug(pool, citySlug, stateCode, countryCode);

  if (!city) {
    // Try to create it if we have enough info
    if (stateCode) {
      console.log(`[Discovery] City ${citySlug} not found, creating...`);
      await seedKnownCities(pool, [{
        name: citySlug.replace(/-/g, ' ').replace(/\b\w/g, c => c.toUpperCase()),
        slug: citySlug,
        stateCode,
        countryCode,
      }]);
      city = await getCityBySlug(pool, citySlug, stateCode, countryCode);
    }

    if (!city) {
      console.log(`[Discovery] City ${citySlug} not found and could not be created`);
      return null;
    }
  }

  return await discoverLocationsForCity(pool, city, { dryRun, verbose });
}

// ============================================================
// STATE-WIDE DISCOVERY
// ============================================================

/**
 * Seed and discover all cities for a state.
 */
export async function discoverState(
  pool: Pool,
  stateCode: string,
  options: {
    dryRun?: boolean;
    verbose?: boolean;
    cityLimit?: number;
  } = {}
): Promise<FullDiscoveryResult> {
  const { dryRun = false, verbose = false, cityLimit = 100 } = options;

  console.log(`[Discovery] Discovering state: ${stateCode}`);

  // Dynamically fetch and seed cities for this state
  console.log(`[Discovery] Fetching cities for ${stateCode} from Dutchie...`);
  const cityNames = await getCitiesForState(stateCode);
  if (cityNames.length > 0) {
    const cities = cityNames.map(name => ({
      name,
      slug: name.toLowerCase().replace(/\s+/g, '-').replace(/[^a-z0-9-]/g, ''),
      stateCode,
    }));
    const seeded = await seedKnownCities(pool, cities);
    console.log(`[Discovery] Seeded ${seeded.created} new cities, ${seeded.updated} updated for ${stateCode}`);
  } else {
    console.log(`[Discovery] No cities found for ${stateCode}`);
  }

  // Run full discovery for this state
  return await runFullDiscovery(pool, {
    dryRun,
    verbose,
    stateCode,
    countryCode: 'US',
    cityLimit,
    skipCityDiscovery: true, // Use seeded cities
    onlyStale: false, // Crawl all
  });
}

// ============================================================
// STATISTICS
// ============================================================

export interface DiscoveryStats {
  cities: {
    total: number;
    crawledLast24h: number;
    neverCrawled: number;
  };
  locations: {
    total: number;
    discovered: number;
    verified: number;
    rejected: number;
    merged: number;
    byState: Array<{ stateCode: string; count: number }>;
  };
}

/**
 * Get discovery statistics.
 */
export async function getDiscoveryStats(pool: Pool): Promise<DiscoveryStats> {
  const [citiesTotal, citiesRecent, citiesNever] = await Promise.all([
    pool.query('SELECT COUNT(*) as cnt FROM dutchie_discovery_cities'),
    pool.query(`SELECT COUNT(*) as cnt FROM dutchie_discovery_cities WHERE last_crawled_at > NOW() - INTERVAL '24 hours'`),
    pool.query('SELECT COUNT(*) as cnt FROM dutchie_discovery_cities WHERE last_crawled_at IS NULL'),
  ]);

  const [locsTotal, locsByStatus, locsByState] = await Promise.all([
    pool.query('SELECT COUNT(*) as cnt FROM dutchie_discovery_locations WHERE active = TRUE'),
    pool.query(`
      SELECT status, COUNT(*) as cnt
      FROM dutchie_discovery_locations
      WHERE active = TRUE
      GROUP BY status
    `),
    pool.query(`
      SELECT state_code, COUNT(*) as cnt
      FROM dutchie_discovery_locations
      WHERE active = TRUE AND state_code IS NOT NULL
      GROUP BY state_code
      ORDER BY cnt DESC
    `),
  ]);

  const statusCounts = locsByStatus.rows.reduce((acc, row) => {
    acc[row.status] = parseInt(row.cnt, 10);
    return acc;
  }, {} as Record<string, number>);

  return {
    cities: {
      total: parseInt(citiesTotal.rows[0].cnt, 10),
      crawledLast24h: parseInt(citiesRecent.rows[0].cnt, 10),
      neverCrawled: parseInt(citiesNever.rows[0].cnt, 10),
    },
    locations: {
      total: parseInt(locsTotal.rows[0].cnt, 10),
      discovered: statusCounts.discovered || 0,
      verified: statusCounts.verified || 0,
      rejected: statusCounts.rejected || 0,
      merged: statusCounts.merged || 0,
      byState: locsByState.rows.map(row => ({
        stateCode: row.state_code,
        count: parseInt(row.cnt, 10),
      })),
    },
  };
}