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

async function geocodeAddress(req, res) {
  try {
    const { address } = req.query;

    if (!address) {
      return res.status(400).json({ error: 'Address parameter required' });
    }

    const result = await geocoding.forwardGeocode(address);

    res.json({
      success: true,
      result: {
        latitude: result.latitude,
        longitude: result.longitude,
        formattedAddress: result.formattedAddress,
        provider: result.provider,
        confidence: result.confidence
      }
    });

  } catch (error) {
    logger.error('Geocoding failed', { error: error.message });
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
}

async function reverseGeocode(req, res) {
  try {
    const { lat, lng } = req.query;

    if (!lat || !lng) {
      return res.status(400).json({ error: 'lat and lng parameters required' });
    }

    const latitude = parseFloat(lat);
    const longitude = parseFloat(lng);

    if (isNaN(latitude) || isNaN(longitude)) {
      return res.status(400).json({ error: 'Invalid coordinates' });
    }

    const result = await geocoding.reverseGeocode(latitude, longitude);

    res.json({
      success: true,
      result: {
        formattedAddress: result.formattedAddress,
        components: result.components,
        latitude: result.latitude,
        longitude: result.longitude
      }
    });

  } catch (error) {
    logger.error('Reverse geocoding failed', { error: error.message });
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
}

async function regeocodeResource(req, res) {
  try {
    const { id } = req.params;

    // Get the resource
    const resourceResult = await db.query(
      'SELECT id, name, address, city, postal_code FROM food_resources WHERE id = $1',
      [id]
    );

    if (resourceResult.rows.length === 0) {
      return res.status(404).json({ success: false, error: 'Resource not found' });
    }

    const resource = resourceResult.rows[0];

    // Build address string
    let addressToGeocode;
    let hasStreetAddress = false;

    if (resource.address && !resource.address.startsWith('PO Box') && resource.address.trim() !== '') {
      addressToGeocode = `${resource.address}, ${resource.city}, Alberta, Canada`;
      hasStreetAddress = true;
    } else if (resource.postal_code && resource.postal_code.trim() !== '') {
      addressToGeocode = `${resource.city}, ${resource.postal_code}, Alberta, Canada`;
    } else if (resource.city) {
      addressToGeocode = `${resource.city}, Alberta, Canada`;
    } else {
      return res.status(400).json({ success: false, error: 'Resource has no address or city to geocode' });
    }

    logger.info(`Re-geocoding resource ${id}: ${resource.name}`, { address: addressToGeocode });

    const geocodeResult = await geocoding.forwardGeocode(addressToGeocode);

    if (!geocodeResult || !geocodeResult.latitude || !geocodeResult.longitude) {
      return res.status(400).json({ success: false, error: 'Could not geocode address' });
    }

    const confidence = geocodeResult.combinedConfidence || geocodeResult.confidence || 50;
    const provider = geocodeResult.provider || 'unknown';
    const warnings = geocodeResult.validation?.warnings || [];

    // Adjust confidence if no street address was provided
    const adjustedConfidence = hasStreetAddress ? confidence : Math.min(confidence, 40);

    // Update the database
    await db.query(`
      UPDATE food_resources
      SET latitude = $1,
          longitude = $2,
          geocode_confidence = $3,
          geocode_provider = $4,
          updated_at = NOW()
      WHERE id = $5
    `, [geocodeResult.latitude, geocodeResult.longitude, adjustedConfidence, provider, id]);

    logger.info(`Re-geocoded resource ${id} successfully`, {
      latitude: geocodeResult.latitude,
      longitude: geocodeResult.longitude,
      confidence: adjustedConfidence,
      provider
    });

    res.json({
      success: true,
      result: {
        latitude: geocodeResult.latitude,
        longitude: geocodeResult.longitude,
        confidence: adjustedConfidence,
        provider,
        warnings,
        formattedAddress: geocodeResult.formattedAddress
      }
    });

  } catch (error) {
    logger.error('Re-geocoding failed', { error: error.message, id: req.params.id });
    res.status(500).json({
      success: false,
      error: error.message
    });
  }
}

module.exports = {
  geocodeAddress,
  reverseGeocode,
  regeocodeResource
};