import { useState } from 'react';
import { StyleSheet, Text, View, TouchableOpacity, ScrollView, ActivityIndicator } from 'react-native';
import Colors from '@/constants/Colors';
import { FontAwesome, FontAwesome5 } from '@expo/vector-icons';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import { getPrograms, ProgramActivities, ProgramActivity } from '@/utils/programs';
import { useEffect } from 'react';

const Icon = ({ iconSet, iconName }: { iconSet: ProgramActivity['iconSet']; iconName: ProgramActivity['iconName'] }) => {
  const color = "black";
  const size = 24;

  switch (iconSet) {
    case 'FontAwesome':
      return <FontAwesome name={iconName as any} size={size} color={color} />;
    case 'FontAwesome5':
      return <FontAwesome5 name={iconName as any} size={size} color={color} />;
    default:
      return null;
  }
};

export default function Programs() {
  const colorScheme = 'dark';
  const [activeDay, setActiveDay] = useState<string | null>(null);
  const insets = useSafeAreaInsets();
  const [activities, setActivities] = useState<ProgramActivities>({});
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [isStale, setIsStale] = useState(false);

  useEffect(() => {
    const fetchPrograms = async () => {
      try {
        const { activities: data, isStale } = await getPrograms();
        setActivities(data);
        setIsStale(isStale);
        if (Object.keys(data).length > 0) {
          const today = new Date();
          const day = String(today.getDate()).padStart(2, '0');
          const month = String(today.getMonth() + 1).padStart(2, '0');
          const year = today.getFullYear();
          const formattedDate = `${day}.${month}.${year}`;

          if (data[formattedDate]) {
            setActiveDay(formattedDate);
          } else {
            setActiveDay(Object.keys(data)[0]);
          }
        }
      } catch (e) {
        setError('Failed to load program activities.');
      } finally {
        setLoading(false);
      }
    };

    fetchPrograms();
  }, []);

  const dayKeys = Object.keys(activities);

  if (loading) {
    return (
      <View style={[styles.container, styles.center]}>
        <ActivityIndicator size="large" color={Colors[colorScheme].text} />
      </View>
    );
  }

  if (error) {
    return (
      <View style={[styles.container, styles.center]}>
        <Text style={{ color: Colors[colorScheme].text }}>{error}</Text>
      </View>
    );
  }

  return (
    <View style={[styles.container, { backgroundColor: Colors[colorScheme].background, paddingTop: insets.top }]}>
      <View style={styles.header}>
        <Text style={[styles.title, { color: Colors[colorScheme].text }]}>Umrah Pilgrimage</Text>
      </View>

      {isStale && (
        <View style={styles.warningContainer}>
          <Text style={styles.warningText}>Failed to fetch latest data. Showing cached activities.</Text>
        </View>
      )}

      <View>
        <ScrollView horizontal showsHorizontalScrollIndicator={false} style={styles.daysScroll}>
          {dayKeys.map((day) => (
            <TouchableOpacity
              key={day}
              style={[styles.dayButton, activeDay === day && styles.activeDayButton]}
              onPress={() => setActiveDay(day)}
            >
              <Text style={[styles.dayText, activeDay === day && styles.activeDayText]}>{day}</Text>
            </TouchableOpacity>
          ))}
        </ScrollView>
      </View>

      <ScrollView style={styles.content}>
        {activeDay &&
          activities[activeDay]?.map((activity, index) => (
            <View key={index}>
              <View style={styles.activityCard}>
                <View style={styles.timeContainer}>
                  <Text style={styles.timeText}>{activity.time}</Text>
                  <Text style={styles.activityTitle}>{activity.title}</Text>
                  <Text style={styles.activityDescription}>{activity.description}</Text>
                </View>
                <View style={styles.iconContainer}>
                  <Icon iconSet={activity.iconSet} iconName={activity.iconName} />
                </View>
              </View>
              {activity.transport && (
                <View style={styles.transportContainer}>
                  <View style={styles.dot} />
                  <View style={styles.dot} />
                  <View style={styles.dot} />
                  <Text style={styles.transportText}>{activity.transport}</Text>
                </View>
              )}
            </View>
          ))}
      </ScrollView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  center: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  header: {
    alignItems: 'center',
    paddingVertical: 10,
    paddingHorizontal: 20,
  },
  warningContainer: {
    backgroundColor: 'orange',
    padding: 10,
    alignItems: 'center',
  },
  warningText: {
    color: 'white',
    textAlign: 'center',
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
  },
  daysScroll: {
    paddingHorizontal: 20,
    paddingVertical: 10,
  },
  dayButton: {
    paddingVertical: 8,
    paddingHorizontal: 16,
    borderRadius: 20,
    backgroundColor: '#333',
    marginRight: 10,
  },
  activeDayButton: {
    backgroundColor: '#555',
  },
  dayText: {
    color: 'white',
  },
  activeDayText: {
    fontWeight: 'bold',
  },
  content: {
    flex: 1,
    paddingHorizontal: 20,
  },
  activityCard: {
    backgroundColor: '#222',
    borderRadius: 15,
    padding: 20,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 10,
  },
  timeContainer: {
    flex: 1,
  },
  timeText: {
    color: 'gray',
    fontSize: 14,
  },
  activityTitle: {
    color: 'white',
    fontSize: 20,
    fontWeight: 'bold',
    marginVertical: 4,
  },
  activityDescription: {
    color: 'gray',
    fontSize: 14,
  },
  iconContainer: {
    width: 50,
    height: 50,
    borderRadius: 25,
    backgroundColor: 'white',
    justifyContent: 'center',
    alignItems: 'center',
  },
  transportContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    marginVertical: 10,
  },
  dot: {
    width: 6,
    height: 6,
    borderRadius: 3,
    backgroundColor: 'gray',
    marginHorizontal: 3,
  },
  transportText: {
    color: 'gray',
    marginLeft: 10,
  },
});