const axios = require('axios');
const db = require('../models/db');
const logger = require('../utils/logger');

/*
 * 211 Alberta Scraper
 *
 * NOTE: ab.211.ca uses Cloudflare protection which blocks automated scraping.
 * This scraper is designed to work with their API if access is granted,
 * or can be used with manual data entry.
 *
 * Options for getting 211 data:
 * 1. Contact 211 Alberta to request API access
 * 2. Use their data export/sharing programs
 * 3. Manual data entry from their website
 *
 * For now, this provides a framework for importing 211 data.
 */

const SEARCH_LOCATIONS = [
  { name: 'Calgary', lat: 51.0447, lng: -114.0719 },
  { name: 'Edmonton', lat: 53.5461, lng: -113.4938 },
  { name: 'Red Deer', lat: 52.2681, lng: -113.8112 },
  { name: 'Lethbridge', lat: 49.6956, lng: -112.8451 },
  { name: 'Medicine Hat', lat: 50.0405, lng: -110.6764 }
];

// Topic ID 58 = Food/Meals in 211's taxonomy
const FOOD_TOPIC_ID = 58;

async function attempt211Fetch(location) {
  const url = `https://ab.211.ca/api/v1/search`;

  try {
    const response = await axios.get(url, {
      params: {
        latitude: location.lat,
        longitude: location.lng,
        topicPath: FOOD_TOPIC_ID,
        distance: 50
      },
      headers: {
        'User-Agent': 'FreeAlbertaFoodBot/1.0',
        'Accept': 'application/json'
      },
      timeout: 30000
    });

    return response.data;
  } catch (error) {
    if (error.response?.status === 403) {
      logger.warn('211 Alberta blocked request (Cloudflare protection)', {
        location: location.name
      });
    } else {
      logger.error('211 fetch failed', {
        location: location.name,
        error: error.message
      });
    }
    return null;
  }
}

async function importManualData(resources) {
  /*
   * Use this function to import manually collected 211 data.
   * Expected format:
   * [{
   *   name: 'Service Name',
   *   description: 'Description',
   *   address: 'Full address',
   *   city: 'City',
   *   phone: 'Phone number',
   *   website: 'URL',
   *   hours: 'Hours of operation',
   *   type: 'food_bank|community_meal|hamper|pantry|etc'
   * }]
   */

  let added = 0;
  let updated = 0;

  for (const resource of resources) {
    try {
      const sourceId = resource.id ||
        `211-${resource.name}-${resource.city}`.replace(/\s+/g, '-').toLowerCase();

      const result = await db.query(`
        INSERT INTO food_resources (
          name, description, resource_type,
          address, city, phone, website,
          hours_of_operation, source, source_id,
          updated_at, last_verified_at
        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, 'ab211', $9, NOW(), NOW())
        ON CONFLICT (source, source_id)
        DO UPDATE SET
          name = EXCLUDED.name,
          description = COALESCE(EXCLUDED.description, food_resources.description),
          address = COALESCE(EXCLUDED.address, food_resources.address),
          phone = COALESCE(EXCLUDED.phone, food_resources.phone),
          website = COALESCE(EXCLUDED.website, food_resources.website),
          hours_of_operation = COALESCE(EXCLUDED.hours_of_operation, food_resources.hours_of_operation),
          updated_at = NOW()
        RETURNING (xmax = 0) AS inserted
      `, [
        resource.name,
        resource.description || null,
        resource.type || 'other',
        resource.address || null,
        resource.city || null,
        resource.phone || null,
        resource.website || null,
        resource.hours || null,
        sourceId
      ]);

      if (result.rows[0].inserted) {
        added++;
      } else {
        updated++;
      }
    } catch (error) {
      logger.error('Failed to import 211 resource', {
        name: resource.name,
        error: error.message
      });
    }
  }

  return { added, updated };
}

async function scrape211Alberta() {
  logger.info('Starting 211 Alberta scrape');
  logger.warn('Note: 211 Alberta has Cloudflare protection. API access may be required.');

  const logResult = await db.query(`
    INSERT INTO scrape_logs (source, status)
    VALUES ('ab211', 'running')
    RETURNING id
  `);
  const logId = logResult.rows[0].id;

  let totalFound = 0;
  let totalAdded = 0;
  let totalUpdated = 0;

  try {
    for (const location of SEARCH_LOCATIONS) {
      const data = await attempt211Fetch(location);

      if (data && data.results) {
        totalFound += data.results.length;
        // Process results if we get any
        logger.info(`Found ${data.results.length} results for ${location.name}`);
      }

      // Rate limiting
      await new Promise(resolve => setTimeout(resolve, 2000));
    }

    await db.query(`
      UPDATE scrape_logs
      SET completed_at = NOW(),
          status = 'completed',
          records_found = $1,
          records_added = $2,
          records_updated = $3
      WHERE id = $4
    `, [totalFound, totalAdded, totalUpdated, logId]);

    logger.info('211 Alberta scrape completed', {
      note: 'API access likely blocked by Cloudflare',
      found: totalFound
    });

    return { found: totalFound, added: totalAdded, updated: totalUpdated };

  } catch (error) {
    await db.query(`
      UPDATE scrape_logs
      SET completed_at = NOW(),
          status = 'failed',
          error_message = $1
      WHERE id = $2
    `, [error.message, logId]);

    throw error;
  }
}

// Run if called directly
if (require.main === module) {
  scrape211Alberta()
    .then(result => {
      console.log('211 scrape attempted:', result);
      process.exit(0);
    })
    .catch(err => {
      console.error('211 scrape failed:', err);
      process.exit(1);
    });
}

module.exports = { scrape211Alberta, importManualData };