/**
 * Discovery Promotion Service
 *
 * Handles the promotion of discovery locations to dispensaries:
 * 1. Discovery → Raw data in dutchie_discovery_locations (status='discovered')
 * 2. Validation → Check required fields, reject incomplete records
 * 3. Promotion → Idempotent upsert to dispensaries, link back via dispensary_id
 */

import { pool } from '../db/pool';
import { DiscoveryLocationRow, DiscoveryStatus } from './types';

// ============================================================
// VALIDATION
// ============================================================

export interface ValidationResult {
  valid: boolean;
  errors: string[];
}

export interface ValidationSummary {
  totalChecked: number;
  validCount: number;
  invalidCount: number;
  invalidRecords: Array<{
    id: number;
    name: string;
    errors: string[];
  }>;
}

/**
 * Validate a single discovery location has all required fields for promotion
 */
export function validateForPromotion(loc: DiscoveryLocationRow): ValidationResult {
  const errors: string[] = [];

  // Required fields
  if (!loc.platform_location_id) {
    errors.push('Missing platform_location_id');
  }
  if (!loc.name || loc.name.trim() === '') {
    errors.push('Missing name');
  }
  if (!loc.city || loc.city.trim() === '') {
    errors.push('Missing city');
  }
  if (!loc.state_code || loc.state_code.trim() === '') {
    errors.push('Missing state_code');
  }
  if (!loc.platform_menu_url) {
    errors.push('Missing platform_menu_url');
  }

  return {
    valid: errors.length === 0,
    errors,
  };
}

/**
 * Validate all discovered locations and return summary
 */
export async function validateDiscoveredLocations(
  stateCode?: string
): Promise<ValidationSummary> {
  let query = `
    SELECT * FROM dutchie_discovery_locations
    WHERE status = 'discovered'
  `;
  const params: string[] = [];

  if (stateCode) {
    query += ` AND state_code = $1`;
    params.push(stateCode);
  }

  const result = await pool.query(query, params);
  const locations = result.rows as DiscoveryLocationRow[];

  const invalidRecords: ValidationSummary['invalidRecords'] = [];
  let validCount = 0;

  for (const loc of locations) {
    const validation = validateForPromotion(loc);
    if (validation.valid) {
      validCount++;
    } else {
      invalidRecords.push({
        id: loc.id,
        name: loc.name,
        errors: validation.errors,
      });
    }
  }

  return {
    totalChecked: locations.length,
    validCount,
    invalidCount: invalidRecords.length,
    invalidRecords,
  };
}

// ============================================================
// PROMOTION
// ============================================================

export interface PromotionResult {
  discoveryId: number;
  dispensaryId: number;
  action: 'created' | 'updated' | 'skipped';
  name: string;
}

export interface PromotionSummary {
  totalProcessed: number;
  created: number;
  updated: number;
  skipped: number;
  rejected: number;
  results: PromotionResult[];
  rejectedRecords: Array<{
    id: number;
    name: string;
    errors: string[];
  }>;
  durationMs: number;
  // Per TASK_WORKFLOW_2024-12-10.md: Track new dispensary IDs for task chaining
  newDispensaryIds: number[];
}

/**
 * Task tracking info for modification audit trail
 */
export interface TaskTrackingInfo {
  taskId: number;
  taskRole: string;
}

/**
 * Generate a URL-safe slug from name and city
 */
function generateSlug(name: string, city: string, state: string): string {
  const base = `${name}-${city}-${state}`
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '')
    .substring(0, 100);
  return base;
}

/**
 * Derive menu_type from platform_menu_url pattern
 */
function deriveMenuType(url: string | null): string {
  if (!url) return 'unknown';
  if (url.includes('/dispensary/')) return 'standalone';
  if (url.includes('/embedded-menu/')) return 'embedded';
  if (url.includes('/stores/')) return 'standalone';
  // Custom domain = embedded widget on store's site
  if (!url.includes('dutchie.com')) return 'embedded';
  return 'unknown';
}

/**
 * Log a promotion action to dutchie_promotion_log
 */
async function logPromotionAction(
  action: string,
  discoveryId: number | null,
  dispensaryId: number | null,
  stateCode: string | null,
  storeName: string | null,
  validationErrors: string[] | null = null,
  fieldChanges: Record<string, any> | null = null,
  triggeredBy: string = 'auto'
): Promise<void> {
  await pool.query(`
    INSERT INTO dutchie_promotion_log
    (discovery_id, dispensary_id, action, state_code, store_name, validation_errors, field_changes, triggered_by)
    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
  `, [
    discoveryId,
    dispensaryId,
    action,
    stateCode,
    storeName,
    validationErrors,
    fieldChanges ? JSON.stringify(fieldChanges) : null,
    triggeredBy,
  ]);
}

/**
 * Create a status alert for the dashboard
 */
export async function createStatusAlert(
  dispensaryId: number,
  profileId: number | null,
  alertType: string,
  severity: 'info' | 'warning' | 'error' | 'critical',
  message: string,
  previousStatus?: string | null,
  newStatus?: string | null,
  metadata?: Record<string, any>
): Promise<number> {
  const result = await pool.query(`
    INSERT INTO crawler_status_alerts
    (dispensary_id, profile_id, alert_type, severity, message, previous_status, new_status, metadata)
    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
    RETURNING id
  `, [
    dispensaryId,
    profileId,
    alertType,
    severity,
    message,
    previousStatus || null,
    newStatus || null,
    metadata ? JSON.stringify(metadata) : null,
  ]);
  return result.rows[0].id;
}

/**
 * Create or update crawler profile for a dispensary with initial sandbox status
 */
async function ensureCrawlerProfile(
  dispensaryId: number,
  dispensaryName: string,
  platformDispensaryId: string
): Promise<{ profileId: number; created: boolean }> {
  // Check if profile already exists
  const existingResult = await pool.query(`
    SELECT id FROM dispensary_crawler_profiles
    WHERE dispensary_id = $1 AND enabled = true
    LIMIT 1
  `, [dispensaryId]);

  if (existingResult.rows.length > 0) {
    return { profileId: existingResult.rows[0].id, created: false };
  }

  // Create new profile with sandbox status
  const profileKey = dispensaryName
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '')
    .substring(0, 50);

  const insertResult = await pool.query(`
    INSERT INTO dispensary_crawler_profiles (
      dispensary_id,
      profile_name,
      profile_key,
      crawler_type,
      status,
      status_reason,
      status_changed_at,
      config,
      enabled,
      consecutive_successes,
      consecutive_failures,
      created_at,
      updated_at
    ) VALUES (
      $1, $2, $3, 'dutchie', 'sandbox', 'Newly promoted from discovery', CURRENT_TIMESTAMP,
      $4::jsonb, true, 0, 0, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
    )
    RETURNING id
  `, [
    dispensaryId,
    dispensaryName,
    profileKey,
    JSON.stringify({
      platformDispensaryId,
      useBothModes: true,
      downloadImages: true,
      trackStock: true,
    }),
  ]);

  const profileId = insertResult.rows[0].id;

  // Create status alert for new sandbox store
  await createStatusAlert(
    dispensaryId,
    profileId,
    'promoted',
    'info',
    `${dispensaryName} promoted to sandbox - awaiting first successful crawl`,
    null,
    'sandbox',
    { source: 'discovery_promotion', platformDispensaryId }
  );

  return { profileId, created: true };
}

/**
 * Promote a single discovery location to dispensaries table
 * Idempotent: uses ON CONFLICT on platform_dispensary_id
 */
async function promoteLocation(
  loc: DiscoveryLocationRow,
  taskTracking?: TaskTrackingInfo
): Promise<PromotionResult> {
  const slug = loc.platform_slug || generateSlug(loc.name, loc.city || '', loc.state_code || '');

  // Upsert into dispensaries
  // ON CONFLICT by platform_dispensary_id ensures idempotency
  const upsertResult = await pool.query(`
    INSERT INTO dispensaries (
      platform,
      name,
      slug,
      city,
      state,
      address1,
      address2,
      zipcode,
      postal_code,
      phone,
      website,
      email,
      latitude,
      longitude,
      timezone,
      platform_dispensary_id,
      menu_url,
      menu_type,
      description,
      logo_image,
      banner_image,
      offer_pickup,
      offer_delivery,
      is_medical,
      is_recreational,
      chain_slug,
      enterprise_id,
      c_name,
      country,
      status,
      crawl_enabled,
      dutchie_verified,
      dutchie_verified_at,
      dutchie_discovery_id,
      last_modified_at,
      last_modified_by_task,
      last_modified_task_id,
      last_store_discovery_at,
      created_at,
      updated_at
    ) VALUES (
      $1, $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, $37, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
    )
    ON CONFLICT (platform_dispensary_id) WHERE platform_dispensary_id IS NOT NULL
    DO UPDATE SET
      name = EXCLUDED.name,
      city = EXCLUDED.city,
      state = EXCLUDED.state,
      address1 = EXCLUDED.address1,
      address2 = EXCLUDED.address2,
      zipcode = EXCLUDED.zipcode,
      postal_code = EXCLUDED.postal_code,
      phone = EXCLUDED.phone,
      website = EXCLUDED.website,
      email = EXCLUDED.email,
      latitude = EXCLUDED.latitude,
      longitude = EXCLUDED.longitude,
      timezone = EXCLUDED.timezone,
      menu_url = EXCLUDED.menu_url,
      description = EXCLUDED.description,
      logo_image = EXCLUDED.logo_image,
      banner_image = EXCLUDED.banner_image,
      offer_pickup = EXCLUDED.offer_pickup,
      offer_delivery = EXCLUDED.offer_delivery,
      is_medical = EXCLUDED.is_medical,
      is_recreational = EXCLUDED.is_recreational,
      chain_slug = EXCLUDED.chain_slug,
      enterprise_id = EXCLUDED.enterprise_id,
      c_name = EXCLUDED.c_name,
      country = EXCLUDED.country,
      status = EXCLUDED.status,
      dutchie_discovery_id = EXCLUDED.dutchie_discovery_id,
      dutchie_verified = TRUE,
      dutchie_verified_at = COALESCE(dispensaries.dutchie_verified_at, CURRENT_TIMESTAMP),
      crawl_enabled = COALESCE(dispensaries.crawl_enabled, TRUE),
      last_modified_at = EXCLUDED.last_modified_at,
      last_modified_by_task = EXCLUDED.last_modified_by_task,
      last_modified_task_id = EXCLUDED.last_modified_task_id,
      last_store_discovery_at = CURRENT_TIMESTAMP,
      updated_at = CURRENT_TIMESTAMP
    RETURNING id, (xmax = 0) AS inserted
  `, [
    loc.platform || 'dutchie',                    // $1 platform
    loc.name,                                      // $2 name
    slug,                                          // $3 slug
    loc.city,                                      // $4 city
    loc.state_code,                                // $5 state
    loc.address_line1,                             // $6 address1
    loc.address_line2,                             // $7 address2
    loc.postal_code,                               // $8 zipcode
    loc.postal_code,                               // $9 postal_code
    loc.phone,                                     // $10 phone
    loc.website,                                   // $11 website
    loc.email,                                     // $12 email
    loc.latitude,                                  // $13 latitude
    loc.longitude,                                 // $14 longitude
    loc.timezone,                                  // $15 timezone
    loc.platform_location_id,                      // $16 platform_dispensary_id
    loc.platform_menu_url,                         // $17 menu_url
    deriveMenuType(loc.platform_menu_url),         // $18 menu_type
    loc.description,                               // $19 description
    loc.logo_image,                                // $20 logo_image
    loc.banner_image,                              // $21 banner_image
    loc.offers_pickup ?? true,                     // $22 offer_pickup
    loc.offers_delivery ?? false,                  // $23 offer_delivery
    loc.is_medical ?? false,                       // $24 is_medical
    loc.is_recreational ?? true,                   // $25 is_recreational
    loc.chain_slug,                                // $26 chain_slug
    loc.enterprise_id,                             // $27 enterprise_id
    loc.c_name,                                    // $28 c_name
    loc.country || 'United States',                // $29 country
    loc.store_status || 'open',                    // $30 status
    true,                                          // $31 crawl_enabled
    true,                                          // $32 dutchie_verified
    new Date(),                                    // $33 dutchie_verified_at
    loc.id,                                        // $34 dutchie_discovery_id
    taskTracking ? new Date() : null,              // $35 last_modified_at
    taskTracking?.taskRole || null,                // $36 last_modified_by_task
    taskTracking?.taskId || null,                  // $37 last_modified_task_id
  ]);

  const dispensaryId = upsertResult.rows[0].id;
  const wasInserted = upsertResult.rows[0].inserted;

  // Link discovery location back to dispensary and update status
  await pool.query(`
    UPDATE dutchie_discovery_locations
    SET
      dispensary_id = $1,
      status = 'verified',
      verified_at = CURRENT_TIMESTAMP,
      verified_by = 'auto-promotion'
    WHERE id = $2
  `, [dispensaryId, loc.id]);

  // Create crawler profile with sandbox status for new dispensaries
  if (wasInserted && loc.platform_location_id) {
    await ensureCrawlerProfile(dispensaryId, loc.name, loc.platform_location_id);
  }

  const action = wasInserted ? 'promoted_create' : 'promoted_update';

  // Log the promotion
  await logPromotionAction(
    action,
    loc.id,
    dispensaryId,
    loc.state_code,
    loc.name,
    null,
    { slug, city: loc.city, platform_location_id: loc.platform_location_id }
  );

  return {
    discoveryId: loc.id,
    dispensaryId,
    action: wasInserted ? 'created' : 'updated',
    name: loc.name,
  };
}

/**
 * Promote all valid discovered locations to dispensaries
 *
 * @param stateCode Optional filter by state (e.g., 'CA', 'AZ')
 * @param dryRun If true, only validate without making changes
 * @param taskTracking Optional task info for modification audit trail
 */
export async function promoteDiscoveredLocations(
  stateCode?: string,
  dryRun = false,
  taskTracking?: TaskTrackingInfo
): Promise<PromotionSummary> {
  const startTime = Date.now();

  let query = `
    SELECT * FROM dutchie_discovery_locations
    WHERE status = 'discovered'
  `;
  const params: string[] = [];

  if (stateCode) {
    query += ` AND state_code = $1`;
    params.push(stateCode);
  }

  query += ` ORDER BY id`;

  const result = await pool.query(query, params);
  const locations = result.rows as DiscoveryLocationRow[];

  const results: PromotionResult[] = [];
  const rejectedRecords: PromotionSummary['rejectedRecords'] = [];
  // Per TASK_WORKFLOW_2024-12-10.md: Track new dispensary IDs for task chaining
  const newDispensaryIds: number[] = [];
  let created = 0;
  let updated = 0;
  let skipped = 0;
  let rejected = 0;

  for (const loc of locations) {
    // Step 2: Validation
    const validation = validateForPromotion(loc);

    if (!validation.valid) {
      rejected++;
      rejectedRecords.push({
        id: loc.id,
        name: loc.name,
        errors: validation.errors,
      });

      // Mark as rejected if not dry run
      if (!dryRun) {
        await pool.query(`
          UPDATE dutchie_discovery_locations
          SET status = 'rejected', notes = $1
          WHERE id = $2
        `, [validation.errors.join('; '), loc.id]);

        // Log the rejection
        await logPromotionAction(
          'rejected',
          loc.id,
          null,
          loc.state_code,
          loc.name,
          validation.errors
        );
      }
      continue;
    }

    // Step 3: Promotion (skip if dry run)
    if (dryRun) {
      skipped++;
      results.push({
        discoveryId: loc.id,
        dispensaryId: 0,
        action: 'skipped',
        name: loc.name,
      });
      continue;
    }

    try {
      const promotionResult = await promoteLocation(loc, taskTracking);
      results.push(promotionResult);

      if (promotionResult.action === 'created') {
        created++;
        // Per TASK_WORKFLOW_2024-12-10.md: Track new IDs for task chaining
        newDispensaryIds.push(promotionResult.dispensaryId);
      } else {
        updated++;
      }
    } catch (error: any) {
      console.error(`Failed to promote location ${loc.id} (${loc.name}):`, error.message);
      rejected++;
      rejectedRecords.push({
        id: loc.id,
        name: loc.name,
        errors: [`Promotion error: ${error.message}`],
      });
    }
  }

  return {
    totalProcessed: locations.length,
    created,
    updated,
    skipped,
    rejected,
    results,
    rejectedRecords,
    durationMs: Date.now() - startTime,
    // Per TASK_WORKFLOW_2024-12-10.md: Return new IDs for task chaining
    newDispensaryIds,
  };
}

/**
 * Promote a single discovery location by ID
 */
export async function promoteSingleLocation(
  discoveryId: number
): Promise<PromotionResult> {
  const result = await pool.query(
    `SELECT * FROM dutchie_discovery_locations WHERE id = $1`,
    [discoveryId]
  );

  if (result.rows.length === 0) {
    throw new Error(`Discovery location ${discoveryId} not found`);
  }

  const loc = result.rows[0] as DiscoveryLocationRow;

  // Validate
  const validation = validateForPromotion(loc);
  if (!validation.valid) {
    throw new Error(`Validation failed: ${validation.errors.join(', ')}`);
  }

  // Promote
  return promoteLocation(loc);
}