/**
 * Product Refresh Handler
 *
 * Per TASK_WORKFLOW_2024-12-10.md: Processes a locally-stored payload.
 *
 * This handler reads from the filesystem (NOT the Dutchie API).
 * The payload_fetch handler is responsible for API calls.
 *
 * Flow:
 * 1. Load payload from filesystem (by payload_id or latest for dispensary)
 * 2. Normalize data via DutchieNormalizer
 * 3. Upsert to store_products and store_product_snapshots
 * 4. Track missing products (increment consecutive_misses, mark OOS at 3)
 * 5. Download new product images
 *
 * Benefits of separation:
 * - Retry-friendly: If this fails, re-run without re-crawling
 * - Replay-able: Run against any historical payload
 * - Faster: Local file read vs network call
 */

import { TaskContext, TaskResult } from '../task-worker';
import { DutchieNormalizer } from '../../hydration/normalizers/dutchie';
import {
  upsertStoreProducts,
  createStoreProductSnapshots,
  downloadProductImages,
} from '../../hydration/canonical-upsert';
import { loadRawPayloadById, getLatestPayload } from '../../utils/payload-storage';

const normalizer = new DutchieNormalizer();

export async function handleProductRefresh(ctx: TaskContext): Promise<TaskResult> {
  const { pool, task } = ctx;
  const dispensaryId = task.dispensary_id;

  if (!dispensaryId) {
    return { success: false, error: 'No dispensary_id specified for product_refresh task' };
  }

  try {
    // ============================================================
    // STEP 1: Load dispensary info
    // ============================================================
    const dispResult = await pool.query(`
      SELECT
        id, name, platform_dispensary_id, menu_url, menu_type, city, state
      FROM dispensaries
      WHERE id = $1
    `, [dispensaryId]);

    if (dispResult.rows.length === 0) {
      return { success: false, error: `Dispensary ${dispensaryId} not found` };
    }

    const dispensary = dispResult.rows[0];

    // Extract cName from menu_url for image storage context
    const cNameMatch = dispensary.menu_url?.match(/\/(?:embedded-menu|dispensary)\/([^/?]+)/);
    const cName = cNameMatch ? cNameMatch[1] : 'dispensary';

    console.log(`[ProductRefresh] Starting refresh for ${dispensary.name} (ID: ${dispensaryId})`);

    await ctx.heartbeat();

    // ============================================================
    // STEP 2: Load payload from filesystem
    // Per TASK_WORKFLOW_2024-12-10.md: Read local payload, not API
    // ============================================================
    let payloadData: any;
    let payloadId: number;

    // Check if specific payload_id was provided (from task chaining)
    const taskPayload = task.payload as { payload_id?: number } | null;

    if (taskPayload?.payload_id) {
      // Load specific payload (from payload_fetch chaining)
      const result = await loadRawPayloadById(pool, taskPayload.payload_id);
      if (!result) {
        return { success: false, error: `Payload ${taskPayload.payload_id} not found` };
      }
      payloadData = result.payload;
      payloadId = result.metadata.id;
      console.log(`[ProductRefresh] Loaded specific payload #${payloadId}`);
    } else {
      // Load latest payload for this dispensary
      const result = await getLatestPayload(pool, dispensaryId);
      if (!result) {
        return { success: false, error: `No payload found for dispensary ${dispensaryId}` };
      }
      payloadData = result.payload;
      payloadId = result.metadata.id;
      console.log(`[ProductRefresh] Loaded latest payload #${payloadId} (${result.metadata.fetchedAt})`);
    }

    const allProducts = payloadData.products || [];

    if (allProducts.length === 0) {
      return {
        success: false,
        error: 'Payload contains no products',
        payloadId,
        productsProcessed: 0,
      };
    }

    console.log(`[ProductRefresh] Processing ${allProducts.length} products from payload #${payloadId}`);

    await ctx.heartbeat();

    // ============================================================
    // STEP 3: Normalize data
    // ============================================================
    console.log(`[ProductRefresh] Normalizing ${allProducts.length} products...`);

    // Build RawPayload for the normalizer
    const rawPayload = {
      id: `refresh-${dispensaryId}-${Date.now()}`,
      dispensary_id: dispensaryId,
      crawl_run_id: null,
      platform: 'dutchie',
      payload_version: 1,
      raw_json: { data: { filteredProducts: { products: allProducts } } },
      product_count: allProducts.length,
      pricing_type: 'dual',
      crawl_mode: 'dual_mode',
      fetched_at: new Date(),
      processed: false,
      normalized_at: null,
      hydration_error: null,
      hydration_attempts: 0,
      created_at: new Date(),
    };

    const normalizationResult = normalizer.normalize(rawPayload);

    if (normalizationResult.errors.length > 0) {
      console.warn(`[ProductRefresh] Normalization warnings: ${normalizationResult.errors.map(e => e.message).join(', ')}`);
    }

    if (normalizationResult.products.length === 0) {
      return {
        success: false,
        error: 'Normalization produced no products',
        payloadId,
        productsProcessed: 0,
      };
    }

    console.log(`[ProductRefresh] Normalized ${normalizationResult.products.length} products`);

    await ctx.heartbeat();

    // ============================================================
    // STEP 4: Upsert to canonical tables
    // ============================================================
    console.log(`[ProductRefresh] Upserting to store_products...`);

    const upsertResult = await upsertStoreProducts(
      pool,
      normalizationResult.products,
      normalizationResult.pricing,
      normalizationResult.availability
    );

    console.log(`[ProductRefresh] Upserted: ${upsertResult.upserted} (${upsertResult.new} new, ${upsertResult.updated} updated)`);

    await ctx.heartbeat();

    // Create snapshots
    console.log(`[ProductRefresh] Creating snapshots...`);

    const snapshotsResult = await createStoreProductSnapshots(
      pool,
      dispensaryId,
      normalizationResult.products,
      normalizationResult.pricing,
      normalizationResult.availability,
      null // No crawl_run_id in new system
    );

    console.log(`[ProductRefresh] Created ${snapshotsResult.created} snapshots`);

    await ctx.heartbeat();

    // ============================================================
    // STEP 5: Track missing products (consecutive_misses logic)
    // - Products in feed: reset consecutive_misses to 0
    // - Products not in feed: increment consecutive_misses
    // - At 3 consecutive misses: mark as OOS
    // ============================================================
    const currentProductIds = allProducts
      .map((p: any) => p._id || p.id)
      .filter(Boolean);

    // Reset consecutive_misses for products that ARE in the feed
    if (currentProductIds.length > 0) {
      await pool.query(`
        UPDATE store_products
        SET consecutive_misses = 0, last_seen_at = NOW()
        WHERE dispensary_id = $1
          AND provider = 'dutchie'
          AND provider_product_id = ANY($2)
      `, [dispensaryId, currentProductIds]);
    }

    // Increment consecutive_misses for products NOT in the feed
    const incrementResult = await pool.query(`
      UPDATE store_products
      SET consecutive_misses = consecutive_misses + 1
      WHERE dispensary_id = $1
        AND provider = 'dutchie'
        AND provider_product_id NOT IN (SELECT unnest($2::text[]))
        AND consecutive_misses < 3
      RETURNING id
    `, [dispensaryId, currentProductIds]);

    const incrementedCount = incrementResult.rowCount || 0;
    if (incrementedCount > 0) {
      console.log(`[ProductRefresh] Incremented consecutive_misses for ${incrementedCount} products`);
    }

    // Mark as OOS any products that hit 3 consecutive misses
    const oosResult = await pool.query(`
      UPDATE store_products
      SET stock_status = 'oos', is_in_stock = false
      WHERE dispensary_id = $1
        AND provider = 'dutchie'
        AND consecutive_misses >= 3
        AND stock_status != 'oos'
      RETURNING id
    `, [dispensaryId]);

    const markedOosCount = oosResult.rowCount || 0;
    if (markedOosCount > 0) {
      console.log(`[ProductRefresh] Marked ${markedOosCount} products as OOS (3+ consecutive misses)`);
    }

    await ctx.heartbeat();

    // ============================================================
    // STEP 6: Download images for new products
    // ============================================================
    if (upsertResult.productsNeedingImages.length > 0) {
      console.log(`[ProductRefresh] Downloading images for ${upsertResult.productsNeedingImages.length} products...`);

      try {
        const dispensaryContext = {
          stateCode: dispensary.state || 'AZ',
          storeSlug: cName,
        };
        await downloadProductImages(
          pool,
          upsertResult.productsNeedingImages,
          dispensaryContext
        );
      } catch (imgError: any) {
        // Image download errors shouldn't fail the whole task
        console.warn(`[ProductRefresh] Image download error (non-fatal): ${imgError.message}`);
      }
    }

    // ============================================================
    // STEP 7: Update dispensary last_crawl_at
    // ============================================================
    await pool.query(`
      UPDATE dispensaries
      SET last_crawl_at = NOW()
      WHERE id = $1
    `, [dispensaryId]);

    // ============================================================
    // STEP 8: Mark payload as processed
    // ============================================================
    await pool.query(`
      UPDATE raw_crawl_payloads
      SET processed_at = NOW()
      WHERE id = $1
    `, [payloadId]);

    console.log(`[ProductRefresh] Completed ${dispensary.name}`);

    return {
      success: true,
      payloadId,
      productsProcessed: normalizationResult.products.length,
      snapshotsCreated: snapshotsResult.created,
      newProducts: upsertResult.new,
      updatedProducts: upsertResult.updated,
      markedOos: markedOosCount,
    };

  } catch (error: unknown) {
    const errorMessage = error instanceof Error ? error.message : 'Unknown error';
    console.error(`[ProductRefresh] Error for dispensary ${dispensaryId}:`, errorMessage);
    return {
      success: false,
      error: errorMessage,
    };
  }
}