/**
 * Incremental Sync
 *
 * Hooks into the crawler to automatically write to canonical tables
 * after each crawl completes. This ensures store_products and
 * store_product_snapshots stay in sync with new data.
 *
 * Two modes:
 * 1. Inline - Called directly from crawler after saving to legacy tables
 * 2. Async - Called from a background worker that processes recent crawls
 *
 * Usage:
 *   // Inline mode (in crawler)
 *   import { syncCrawlToCanonical } from './hydration/incremental-sync';
 *   await syncCrawlToCanonical(pool, crawlResult);
 *
 *   // Async mode (background worker)
 *   import { syncRecentCrawls } from './hydration/incremental-sync';
 *   await syncRecentCrawls(pool, { since: '1 hour' });
 */

import { Pool } from 'pg';

const BATCH_SIZE = 100;

// ============================================================
// TYPES
// ============================================================

export interface CrawlResult {
  dispensaryId: number;
  stateId?: number;
  platformDispensaryId?: string;
  crawlJobId?: number;  // legacy dispensary_crawl_jobs.id
  startedAt: Date;
  finishedAt?: Date;
  status: 'success' | 'failed' | 'running';
  errorMessage?: string;
  productsFound: number;
  productsCreated: number;
  productsUpdated: number;
  productsMissing?: number;
  brandsFound?: number;
}

export interface SyncOptions {
  dryRun?: boolean;
  verbose?: boolean;
  skipSnapshots?: boolean;
}

export interface SyncResult {
  crawlRunId: number | null;
  productsUpserted: number;
  productsNew: number;
  productsUpdated: number;
  snapshotsCreated: number;
  durationMs: number;
  errors: string[];
}

// ============================================================
// CREATE OR GET CRAWL RUN
// ============================================================

/**
 * Create a crawl_run record for a completed crawl.
 * Returns existing if already synced (idempotent).
 */
export async function getOrCreateCrawlRun(
  pool: Pool,
  crawlResult: CrawlResult,
  options: SyncOptions = {}
): Promise<number | null> {
  const { dryRun = false, verbose = false } = options;

  // Check if already exists (by legacy job ID)
  if (crawlResult.crawlJobId) {
    const existing = await pool.query(
      `SELECT id FROM crawl_runs WHERE legacy_dispensary_crawl_job_id = $1`,
      [crawlResult.crawlJobId]
    );

    if (existing.rows.length > 0) {
      if (verbose) {
        console.log(`[IncrSync] Found existing crawl_run ${existing.rows[0].id} for job ${crawlResult.crawlJobId}`);
      }
      return existing.rows[0].id;
    }
  }

  if (dryRun) {
    console.log(`[IncrSync][DryRun] Would create crawl_run for dispensary ${crawlResult.dispensaryId}`);
    return null;
  }

  const durationMs = crawlResult.finishedAt && crawlResult.startedAt
    ? crawlResult.finishedAt.getTime() - crawlResult.startedAt.getTime()
    : null;

  const result = await pool.query(
    `INSERT INTO crawl_runs (
      dispensary_id, state_id, provider,
      legacy_dispensary_crawl_job_id,
      started_at, finished_at, duration_ms,
      status, error_message,
      products_found, products_new, products_updated, products_missing,
      brands_found, trigger_type, created_at
    ) VALUES (
      $1, $2, 'dutchie',
      $3,
      $4, $5, $6,
      $7, $8,
      $9, $10, $11, $12,
      $13, 'scheduled', NOW()
    )
    RETURNING id`,
    [
      crawlResult.dispensaryId,
      crawlResult.stateId,
      crawlResult.crawlJobId,
      crawlResult.startedAt,
      crawlResult.finishedAt,
      durationMs,
      crawlResult.status,
      crawlResult.errorMessage,
      crawlResult.productsFound,
      crawlResult.productsCreated,
      crawlResult.productsUpdated,
      crawlResult.productsMissing || 0,
      crawlResult.brandsFound || 0,
    ]
  );

  if (verbose) {
    console.log(`[IncrSync] Created crawl_run ${result.rows[0].id}`);
  }

  return result.rows[0].id;
}

// ============================================================
// SYNC PRODUCTS TO CANONICAL
// ============================================================

/**
 * Sync dutchie_products to store_products for a single dispensary.
 * Called after a crawl completes.
 */
export async function syncProductsToCanonical(
  pool: Pool,
  dispensaryId: number,
  stateId: number | null,
  crawlRunId: number | null,
  options: SyncOptions = {}
): Promise<{ upserted: number; new: number; updated: number; errors: string[] }> {
  const { dryRun = false, verbose = false } = options;
  const errors: string[] = [];
  let newCount = 0;
  let updatedCount = 0;

  // Get all products for this dispensary
  const { rows: products } = await pool.query(
    `SELECT
      dp.id,
      dp.external_product_id,
      dp.name,
      dp.brand_name,
      dp.brand_id,
      dp.category,
      dp.subcategory,
      dp.type,
      dp.strain_type,
      dp.description,
      dp.effects,
      dp.cannabinoids_v2,
      dp.thc,
      dp.thc_content,
      dp.cbd,
      dp.cbd_content,
      dp.primary_image_url,
      dp.local_image_url,
      dp.local_image_thumb_url,
      dp.local_image_medium_url,
      dp.original_image_url,
      dp.additional_images,
      dp.stock_status,
      dp.c_name,
      dp.enterprise_product_id,
      dp.weight,
      dp.options,
      dp.measurements,
      dp.status,
      dp.featured,
      dp.special,
      dp.medical_only,
      dp.rec_only,
      dp.is_below_threshold,
      dp.is_below_kiosk_threshold,
      dp.total_quantity_available,
      dp.total_kiosk_quantity_available,
      dp.first_seen_at,
      dp.last_seen_at,
      dp.updated_at,
      d.platform_dispensary_id
    FROM dutchie_products dp
    LEFT JOIN dispensaries d ON d.id = dp.dispensary_id
    WHERE dp.dispensary_id = $1`,
    [dispensaryId]
  );

  if (verbose) {
    console.log(`[IncrSync] Found ${products.length} products for dispensary ${dispensaryId}`);
  }

  // Process in batches
  for (let i = 0; i < products.length; i += BATCH_SIZE) {
    const batch = products.slice(i, i + BATCH_SIZE);

    for (const p of batch) {
      try {
        const thcPercent = parseFloat(p.thc) || parseFloat(p.thc_content) || null;
        const cbdPercent = parseFloat(p.cbd) || parseFloat(p.cbd_content) || null;
        const stockStatus = p.stock_status || 'unknown';
        const isInStock = stockStatus === 'in_stock' || stockStatus === 'unknown';

        if (dryRun) {
          if (verbose) {
            console.log(`[IncrSync][DryRun] Would upsert product ${p.external_product_id}`);
          }
          newCount++;
          continue;
        }

        const result = await pool.query(
          `INSERT INTO store_products (
            dispensary_id, provider, provider_product_id, provider_brand_id,
            platform_dispensary_id, external_product_id,
            name_raw, brand_name_raw, category_raw, subcategory_raw, strain_type,
            description, effects, cannabinoids_v2,
            thc_percent, cbd_percent, thc_content, cbd_content,
            is_in_stock, stock_status, stock_quantity, total_quantity_available,
            image_url, primary_image_url, images,
            is_on_special, featured, medical_only, rec_only,
            is_below_threshold, is_below_kiosk_threshold,
            status, c_name, weight, measurements,
            first_seen_at, last_seen_at, created_at, updated_at
          ) VALUES (
            $1, 'dutchie', $2, $3,
            $4, $5,
            $6, $7, $8, $9, $10,
            $11, $12, $13,
            $14, $15, $16, $17,
            $18, $19, $20, $21,
            $22, $23, $24,
            $25, $26, $27, $28,
            $29, $30,
            $31, $32, $33, $34,
            $35, $36, NOW(), NOW()
          )
          ON CONFLICT (dispensary_id, provider, provider_product_id)
          DO UPDATE SET
            name_raw = EXCLUDED.name_raw,
            brand_name_raw = EXCLUDED.brand_name_raw,
            category_raw = EXCLUDED.category_raw,
            subcategory_raw = EXCLUDED.subcategory_raw,
            strain_type = EXCLUDED.strain_type,
            is_in_stock = EXCLUDED.is_in_stock,
            stock_status = EXCLUDED.stock_status,
            stock_quantity = EXCLUDED.stock_quantity,
            total_quantity_available = EXCLUDED.total_quantity_available,
            thc_percent = EXCLUDED.thc_percent,
            cbd_percent = EXCLUDED.cbd_percent,
            thc_content = EXCLUDED.thc_content,
            cbd_content = EXCLUDED.cbd_content,
            image_url = EXCLUDED.image_url,
            primary_image_url = EXCLUDED.primary_image_url,
            is_on_special = EXCLUDED.is_on_special,
            status = EXCLUDED.status,
            description = COALESCE(EXCLUDED.description, store_products.description),
            effects = COALESCE(EXCLUDED.effects, store_products.effects),
            cannabinoids_v2 = COALESCE(EXCLUDED.cannabinoids_v2, store_products.cannabinoids_v2),
            weight = EXCLUDED.weight,
            measurements = EXCLUDED.measurements,
            last_seen_at = NOW(),
            updated_at = NOW()
          RETURNING (xmax = 0) as is_new`,
          [
            dispensaryId,                        // $1
            p.external_product_id,               // $2
            p.brand_id,                          // $3
            p.platform_dispensary_id,            // $4
            p.external_product_id,               // $5 external_product_id
            p.name,                              // $6
            p.brand_name,                        // $7
            p.type || p.category,                // $8 category_raw
            p.subcategory,                       // $9
            p.strain_type,                       // $10
            p.description,                       // $11
            p.effects,                           // $12
            p.cannabinoids_v2,                   // $13
            thcPercent,                          // $14
            cbdPercent,                          // $15
            p.thc_content,                       // $16
            p.cbd_content,                       // $17
            isInStock,                           // $18
            stockStatus,                         // $19
            p.total_quantity_available || 0,     // $20 stock_quantity
            p.total_quantity_available || 0,     // $21
            p.primary_image_url,                 // $22 image_url
            p.primary_image_url,                 // $23
            p.additional_images,                 // $24 images
            p.special || false,                  // $25
            p.featured || false,                 // $26
            p.medical_only || false,             // $27
            p.rec_only || false,                 // $28
            p.is_below_threshold || false,       // $29
            p.is_below_kiosk_threshold || false, // $30
            p.status,                            // $31
            p.c_name,                            // $32
            p.weight,                            // $33
            p.measurements,                      // $34
            p.first_seen_at || p.updated_at,     // $35
            p.last_seen_at || p.updated_at,      // $36
          ]
        );

        if (result.rows[0]?.is_new) {
          newCount++;
        } else {
          updatedCount++;
        }
      } catch (error: any) {
        errors.push(`Product ${p.id}: ${error.message}`);
      }
    }
  }

  return {
    upserted: newCount + updatedCount,
    new: newCount,
    updated: updatedCount,
    errors,
  };
}

// ============================================================
// SYNC SNAPSHOTS TO CANONICAL
// ============================================================

/**
 * Sync dutchie_product_snapshots to store_product_snapshots for recent crawls.
 */
export async function syncSnapshotsToCanonical(
  pool: Pool,
  dispensaryId: number,
  stateId: number | null,
  crawlRunId: number | null,
  since: Date,
  options: SyncOptions = {}
): Promise<{ created: number; errors: string[] }> {
  const { dryRun = false, verbose = false } = options;
  const errors: string[] = [];
  let created = 0;

  // Get recent snapshots that haven't been synced yet
  const { rows: snapshots } = await pool.query(
    `SELECT
      dps.id,
      dps.dutchie_product_id,
      dps.dispensary_id,
      dps.options,
      dps.raw_product_data,
      dps.crawled_at,
      dps.created_at,
      dp.external_product_id,
      dp.name,
      dp.brand_name,
      dp.category,
      dp.subcategory,
      sp.id as store_product_id,
      d.platform_dispensary_id
    FROM dutchie_product_snapshots dps
    JOIN dutchie_products dp ON dp.id = dps.dutchie_product_id
    LEFT JOIN store_products sp ON sp.dispensary_id = dps.dispensary_id
      AND sp.provider_product_id = dp.external_product_id
      AND sp.provider = 'dutchie'
    LEFT JOIN dispensaries d ON d.id = dps.dispensary_id
    LEFT JOIN store_product_snapshots sps ON sps.legacy_snapshot_id = dps.id
    WHERE dps.dispensary_id = $1
      AND dps.crawled_at >= $2
      AND sps.id IS NULL
    ORDER BY dps.id`,
    [dispensaryId, since]
  );

  if (verbose) {
    console.log(`[IncrSync] Found ${snapshots.length} new snapshots since ${since.toISOString()}`);
  }

  if (snapshots.length === 0) {
    return { created: 0, errors: [] };
  }

  for (const s of snapshots) {
    try {
      // Extract pricing from raw_product_data
      let priceRec: number | null = null;
      let priceMed: number | null = null;
      let priceRecSpecial: number | null = null;
      let isOnSpecial = false;
      let isInStock = true;
      let thcPercent: number | null = null;
      let cbdPercent: number | null = null;
      let stockStatus = 'unknown';
      let platformStatus: string | null = null;

      if (s.raw_product_data) {
        const raw = typeof s.raw_product_data === 'string'
          ? JSON.parse(s.raw_product_data)
          : s.raw_product_data;

        priceRec = raw.recPrices?.[0] || raw.Prices?.[0] || null;
        priceMed = raw.medicalPrices?.[0] || null;
        priceRecSpecial = raw.recSpecialPrices?.[0] || null;
        isOnSpecial = raw.special === true || (priceRecSpecial !== null);
        thcPercent = raw.THCContent?.range?.[0] || raw.THC || null;
        cbdPercent = raw.CBDContent?.range?.[0] || raw.CBD || null;
        platformStatus = raw.Status || null;
        isInStock = platformStatus === 'Active';
        stockStatus = isInStock ? 'in_stock' : 'out_of_stock';
      }

      if (dryRun) {
        if (verbose) {
          console.log(`[IncrSync][DryRun] Would create snapshot for legacy ${s.id}`);
        }
        created++;
        continue;
      }

      await pool.query(
        `INSERT INTO store_product_snapshots (
          dispensary_id, store_product_id, state_id,
          provider, provider_product_id, provider_dispensary_id,
          crawl_run_id,
          legacy_snapshot_id, legacy_dutchie_product_id,
          captured_at,
          name, brand_name, category, subcategory,
          price_rec, price_med, price_rec_special,
          is_on_special, is_in_stock, stock_status,
          thc_percent, cbd_percent,
          platform_status, options, raw_data,
          created_at
        ) VALUES (
          $1, $2, $3,
          'dutchie', $4, $5,
          $6,
          $7, $8,
          $9,
          $10, $11, $12, $13,
          $14, $15, $16,
          $17, $18, $19,
          $20, $21,
          $22, $23, $24,
          NOW()
        )`,
        [
          s.dispensary_id,
          s.store_product_id,
          stateId,
          s.external_product_id,
          s.platform_dispensary_id,
          crawlRunId,
          s.id,
          s.dutchie_product_id,
          s.crawled_at,
          s.name,
          s.brand_name,
          s.category,
          s.subcategory,
          priceRec,
          priceMed,
          priceRecSpecial,
          isOnSpecial,
          isInStock,
          stockStatus,
          thcPercent,
          cbdPercent,
          platformStatus,
          s.options,
          s.raw_product_data,
        ]
      );

      created++;
    } catch (error: any) {
      errors.push(`Snapshot ${s.id}: ${error.message}`);
    }
  }

  return { created, errors };
}

// ============================================================
// MAIN SYNC FUNCTION
// ============================================================

/**
 * Sync a single crawl result to canonical tables.
 * Call this from the crawler after each crawl completes.
 */
export async function syncCrawlToCanonical(
  pool: Pool,
  crawlResult: CrawlResult,
  options: SyncOptions = {}
): Promise<SyncResult> {
  const startTime = Date.now();
  const errors: string[] = [];
  const { verbose = false, skipSnapshots = false } = options;

  if (verbose) {
    console.log(`[IncrSync] Starting sync for dispensary ${crawlResult.dispensaryId}`);
  }

  // 1. Create crawl_run record
  const crawlRunId = await getOrCreateCrawlRun(pool, crawlResult, options);

  // 2. Sync products
  const productResult = await syncProductsToCanonical(
    pool,
    crawlResult.dispensaryId,
    crawlResult.stateId || null,
    crawlRunId,
    options
  );
  errors.push(...productResult.errors);

  // 3. Sync snapshots (if not skipped)
  let snapshotsCreated = 0;
  if (!skipSnapshots) {
    const since = new Date(crawlResult.startedAt.getTime() - 60 * 1000); // 1 min before
    const snapshotResult = await syncSnapshotsToCanonical(
      pool,
      crawlResult.dispensaryId,
      crawlResult.stateId || null,
      crawlRunId,
      since,
      options
    );
    snapshotsCreated = snapshotResult.created;
    errors.push(...snapshotResult.errors);
  }

  const durationMs = Date.now() - startTime;

  if (verbose) {
    console.log(`[IncrSync] Completed in ${durationMs}ms: ${productResult.upserted} products, ${snapshotsCreated} snapshots`);
  }

  return {
    crawlRunId,
    productsUpserted: productResult.upserted,
    productsNew: productResult.new,
    productsUpdated: productResult.updated,
    snapshotsCreated,
    durationMs,
    errors,
  };
}

// ============================================================
// BATCH SYNC FOR RECENT CRAWLS
// ============================================================

export interface RecentSyncOptions extends SyncOptions {
  since?: string;  // e.g., '1 hour', '30 minutes', '1 day'
  dispensaryId?: number;
  limit?: number;
}

/**
 * Sync recent crawls that haven't been synced yet.
 * Run this as a background job to catch any missed syncs.
 */
export async function syncRecentCrawls(
  pool: Pool,
  options: RecentSyncOptions = {}
): Promise<{ synced: number; errors: string[] }> {
  const {
    since = '1 hour',
    dispensaryId,
    limit = 100,
    verbose = false,
    dryRun = false,
  } = options;

  const errors: string[] = [];
  let synced = 0;

  // Find recent completed crawl jobs that don't have a crawl_run
  let query = `
    SELECT
      dcj.id as crawl_job_id,
      dcj.dispensary_id,
      dcj.status,
      dcj.started_at,
      dcj.completed_at,
      dcj.products_found,
      dcj.products_created,
      dcj.products_updated,
      dcj.brands_found,
      dcj.error_message,
      d.state_id
    FROM dispensary_crawl_jobs dcj
    LEFT JOIN dispensaries d ON d.id = dcj.dispensary_id
    LEFT JOIN crawl_runs cr ON cr.legacy_dispensary_crawl_job_id = dcj.id
    WHERE dcj.status IN ('completed', 'failed')
      AND dcj.started_at > NOW() - INTERVAL '${since}'
      AND cr.id IS NULL
  `;

  const params: any[] = [];
  let paramIdx = 1;

  if (dispensaryId) {
    query += ` AND dcj.dispensary_id = $${paramIdx}`;
    params.push(dispensaryId);
    paramIdx++;
  }

  query += ` ORDER BY dcj.started_at DESC LIMIT $${paramIdx}`;
  params.push(limit);

  const { rows: unsynced } = await pool.query(query, params);

  if (verbose) {
    console.log(`[IncrSync] Found ${unsynced.length} unsynced crawls from last ${since}`);
  }

  for (const job of unsynced) {
    try {
      const crawlResult: CrawlResult = {
        dispensaryId: job.dispensary_id,
        stateId: job.state_id,
        crawlJobId: job.crawl_job_id,
        startedAt: new Date(job.started_at),
        finishedAt: job.completed_at ? new Date(job.completed_at) : undefined,
        status: job.status === 'completed' ? 'success' : 'failed',
        errorMessage: job.error_message,
        productsFound: job.products_found || 0,
        productsCreated: job.products_created || 0,
        productsUpdated: job.products_updated || 0,
        brandsFound: job.brands_found || 0,
      };

      await syncCrawlToCanonical(pool, crawlResult, { dryRun, verbose });
      synced++;
    } catch (error: any) {
      errors.push(`Job ${job.crawl_job_id}: ${error.message}`);
    }
  }

  return { synced, errors };
}

// Types CrawlResult, SyncOptions, and SyncResult are already exported at their declarations