import React, { useState, useEffect } from 'react';
import { View, Text, StyleSheet, ImageBackground, Pressable } from 'react-native';
import Colors from '@/constants/Colors';
import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
import prayerTimeCalculator, { cities } from '@/utils/prayerTimeCalculator';

type Prayer = {
  name: string;
  time: string;
  icon: string;
};

const prayerIconMapping: { [key: string]: string } = {
  fajr: 'weather-sunset-up',
  sunrise: 'weather-sunny',
  dhuhr: 'weather-partly-cloudy',
  asr: 'weather-cloudy',
  maghrib: 'weather-sunset-down',
  isha: 'weather-night',
};

export default function PrayerTimeCard() {
  const [prayerTimes, setPrayerTimes] = useState<Prayer[]>([]);
  const [nextPrayer, setNextPrayer] = useState<{ name: string; time: string } | null>(null);
  const [remainingTime, setRemainingTime] = useState('');
  const [selectedCity, setSelectedCity] = useState<'Makkah' | 'Medina' | 'Jeddah'>('Makkah');

  useEffect(() => {
    const city = cities[selectedCity];
    const times = prayerTimeCalculator.getTimes(new Date(), city.coords, city.timezone, 0, '24h');
    
    const prayers: Prayer[] = Object.keys(prayerIconMapping).map(key => ({
      name: key.charAt(0).toUpperCase() + key.slice(1),
      time: times[key] || '-----',
      icon: prayerIconMapping[key],
    }));

    setPrayerTimes(prayers);

    // Find next prayer and calculate remaining time
    const now = new Date();
    let nextPrayerInfo = null;
    for (const prayer of prayers) {
      const [hours, minutes] = prayer.time.split(':').map(Number);
      const prayerDate = new Date(now.getFullYear(), now.getMonth(), now.getDate(), hours, minutes);
      if (prayerDate > now) {
        nextPrayerInfo = { name: prayer.name, time: prayer.time };
        break;
      }
    }

    if (!nextPrayerInfo && prayers.length > 0) {
      // If all prayers for today have passed, next prayer is Fajr of tomorrow
      nextPrayerInfo = { name: prayers[0].name, time: prayers[0].time };
    }

    setNextPrayer(nextPrayerInfo);

  }, [selectedCity]);

  useEffect(() => {
    if (!nextPrayer) return;

    const interval = setInterval(() => {
      const now = new Date();
      const [hours, minutes] = nextPrayer.time.split(':').map(Number);
      let prayerDate = new Date(now.getFullYear(), now.getMonth(), now.getDate(), hours, minutes);
      
      if (prayerDate < now) {
        prayerDate.setDate(prayerDate.getDate() + 1);
      }

      const diff = prayerDate.getTime() - now.getTime();
      const h = Math.floor(diff / (1000 * 60 * 60));
      const m = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
      const s = Math.floor((diff % (1000 * 60)) / 1000);
      setRemainingTime(`${h.toString().padStart(2, '0')}:${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`);
    }, 1000);

    return () => clearInterval(interval);
  }, [nextPrayer]);

  return (
    <ImageBackground
      source={{ uri: 'https://i.imgur.com/your-image.jpg' }} // Replace with a real image URL
      style={styles.container}
      imageStyle={{ borderRadius: 15 }}
    >
      <View style={styles.overlay}>
        <View style={styles.header}>
          <View style={styles.citySelector}>
            {Object.keys(cities).map(city => (
              <Pressable key={city} onPress={() => setSelectedCity(city as any)} style={[styles.cityButton, selectedCity === city && styles.activeCity]}>
                <Text style={styles.cityButtonText}>{city}</Text>
              </Pressable>
            ))}
          </View>
        </View>
        <Text style={styles.remainingTimeLabel}>
          {nextPrayer ? `Left on ${nextPrayer.name} prayer` : 'Prayer Times'}
        </Text>
        <Text style={styles.remainingTime}>{remainingTime}</Text>
        <View style={styles.prayerTimesContainer}>
          {prayerTimes.map((prayer, index) => (
            <View key={index} style={styles.prayerTimeItem}>
              <MaterialCommunityIcons name={prayer.icon} size={24} color={Colors.dark.text} />
              <Text style={styles.prayerName}>{prayer.name}</Text>
              <Text style={styles.prayerTime}>{prayer.time}</Text>
            </View>
          ))}
        </View>
      </View>
    </ImageBackground>
  );
}

const styles = StyleSheet.create({
  container: {
    marginVertical: 20,
    borderRadius: 15,
  },
  overlay: {
    backgroundColor: 'rgba(0,0,0,0.5)',
    borderRadius: 15,
    padding: 20,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 20,
    justifyContent: 'center',
  },
  citySelector: {
    flexDirection: 'row',
    backgroundColor: Colors.dark.secondary,
    borderRadius: 10,
  },
  cityButton: {
    paddingVertical: 8,
    paddingHorizontal: 15,
    borderRadius: 10,
  },
  activeCity: {
    backgroundColor: Colors.dark.tint,
  },
  cityButtonText: {
    color: Colors.dark.text,
    fontWeight: 'bold',
  },
  remainingTimeLabel: {
    color: Colors.dark.textSecondary,
    textAlign: 'center',
  },
  remainingTime: {
    color: Colors.dark.text,
    fontSize: 48,
    fontWeight: 'bold',
    textAlign: 'center',
    marginVertical: 10,
  },
  prayerTimesContainer: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    marginTop: 20,
  },
  prayerTimeItem: {
    alignItems: 'center',
  },
  prayerName: {
    color: Colors.dark.text,
    marginTop: 5,
  },
  prayerTime: {
    color: Colors.dark.textSecondary,
    fontSize: 12,
  },
});