const express = require('express');
const path = require('path');

const app = express();
const PORT = process.env.PORT || 3000;

app.use(express.static(path.join(__dirname, 'public')));

// Geocoding proxy
app.get('/api/geocode', async (req, res) => {
  const { q } = req.query;
  if (!q) return res.status(400).json({ error: 'Missing query' });
  try {
    const url = `https://geocoding-api.open-meteo.com/v1/search?name=${encodeURIComponent(q)}&count=5&language=en&format=json`;
    const r = await fetch(url);
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: 'Geocoding failed', detail: e.message });
  }
});

// Reverse geocoding proxy
app.get('/api/reverse-geocode', async (req, res) => {
  const { lat, lon } = req.query;
  if (!lat || !lon) return res.status(400).json({ error: 'Missing lat/lon' });

  try {
    // Prefer Open-Meteo reverse geocoding for stable city/region labels.
    const omParams = new URLSearchParams({
      latitude: String(lat),
      longitude: String(lon),
      count: '1',
      language: 'en',
      format: 'json',
    });

    const omResp = await fetch(`https://geocoding-api.open-meteo.com/v1/reverse?${omParams}`);
    if (omResp.ok) {
      const omData = await omResp.json();
      const top = omData?.results?.[0];
      if (top) {
        return res.json({
          name: top.name || top.admin2 || top.admin1 || top.country || 'Detected location',
          admin1: top.admin1 || top.admin2 || '',
          country: top.country || '',
          latitude: Number(lat),
          longitude: Number(lon),
          timezone: top.timezone || 'auto',
          display_name: [top.name, top.admin1, top.country].filter(Boolean).join(', '),
        });
      }
    }

    const params = new URLSearchParams({
      format: 'jsonv2',
      lat: String(lat),
      lon: String(lon),
      zoom: '10',
      addressdetails: '1',
    });

    const r = await fetch(`https://nominatim.openstreetmap.org/reverse?${params}`, {
      headers: {
        'User-Agent': 'weather-app-v2 (nate@necloud.us)',
        Accept: 'application/json',
      },
    });

    if (!r.ok) {
      throw new Error(`Reverse geocoding failed with status ${r.status}`);
    }

    const data = await r.json();
    const address = data.address || {};
    const name = address.city || address.town || address.village || address.hamlet || address.municipality || address.county || address.state || data.name || 'Detected location';

    res.json({
      name,
      admin1: address.state || address.region || address.county || '',
      country: address.country || '',
      latitude: Number(lat),
      longitude: Number(lon),
      timezone: 'auto',
      display_name: data.display_name || '',
    });
  } catch (e) {
    res.status(500).json({ error: 'Reverse geocoding failed', detail: e.message });
  }
});

// Weather proxy
app.get('/api/weather', async (req, res) => {
  const { lat, lon, tz, units } = req.query;
  if (!lat || !lon) return res.status(400).json({ error: 'Missing lat/lon' });
  const timezone = tz || 'auto';
  const useMetric = units === 'metric';
  try {
    const params = new URLSearchParams({
      latitude: lat, longitude: lon, timezone,
      current: [
        'temperature_2m','relative_humidity_2m','apparent_temperature',
        'is_day','precipitation','weather_code','cloud_cover',
        'wind_speed_10m','wind_direction_10m','surface_pressure','visibility'
      ].join(','),
      hourly: [
        'temperature_2m','precipitation_probability','weather_code',
        'wind_speed_10m','apparent_temperature','rain','snowfall'
      ].join(','),
      daily: [
        'weather_code','temperature_2m_max','temperature_2m_min',
        'precipitation_sum','precipitation_probability_max',
        'wind_speed_10m_max','sunrise','sunset','uv_index_max'
      ].join(','),
      forecast_days: 16,
      wind_speed_unit: useMetric ? 'kmh' : 'mph',
      temperature_unit: useMetric ? 'celsius' : 'fahrenheit',
      precipitation_unit: useMetric ? 'mm' : 'inch'
    });
    const r = await fetch(`https://api.open-meteo.com/v1/forecast?${params}`);
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: 'Weather fetch failed', detail: e.message });
  }
});

// Open-Meteo Air Quality proxy
app.get('/api/air-quality', async (req, res) => {
  const { lat, lon, tz } = req.query;
  if (!lat || !lon) return res.status(400).json({ error: 'Missing lat/lon' });
  try {
    const params = new URLSearchParams({
      latitude: lat,
      longitude: lon,
      timezone: tz || 'auto',
      current: ['us_aqi', 'pm2_5', 'alder_pollen', 'birch_pollen', 'grass_pollen', 'mugwort_pollen', 'olive_pollen', 'ragweed_pollen'].join(','),
      forecast_days: 1,
    });
    const r = await fetch(`https://air-quality-api.open-meteo.com/v1/air-quality?${params}`);
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: 'Air quality fetch failed', detail: e.message });
  }
});

// NWS alerts proxy (US only)
app.get('/api/alerts', async (req, res) => {
  const { lat, lon } = req.query;
  if (!lat || !lon) return res.status(400).json({ error: 'Missing lat/lon' });
  try {
    const r = await fetch(`https://api.weather.gov/alerts/active?point=${lat},${lon}`, {
      headers: {
        'User-Agent': 'weather-app-v2 (nate@necloud.us)',
        Accept: 'application/geo+json',
      },
    });
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: 'Alerts fetch failed', detail: e.message });
  }
});

// RainViewer timestamps proxy
app.get('/api/radar/times', async (req, res) => {
  try {
    const r = await fetch('https://api.rainviewer.com/public/weather-maps.json');
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: 'Radar times failed', detail: e.message });
  }
});

app.listen(PORT, () => console.log(`Weather app running on port ${PORT}`));