import React from 'react';
import { View, Text, StyleSheet, Modal, FlatList, Pressable, TouchableOpacity } from 'react-native';

import usePlayerStore from '@/stores/playerStore';
import { useState } from 'react';

interface Episode {
  title?: string;
  url: string;
}

interface EpisodeSelectionModalProps {}

export const EpisodeSelectionModal: React.FC<EpisodeSelectionModalProps> = () => {
  const { showEpisodeModal, episodes, currentEpisodeIndex, playEpisode, setShowEpisodeModal } = usePlayerStore();

  const [episodeGroupSize] = useState(30);
  const [selectedEpisodeGroup, setSelectedEpisodeGroup] = useState(Math.floor(currentEpisodeIndex / episodeGroupSize));

  const onSelectEpisode = (index: number) => {
    playEpisode(index);
    setShowEpisodeModal(false);
  };

  const onClose = () => {
    setShowEpisodeModal(false);
  };

  return (
    <Modal visible={showEpisodeModal} transparent={true} animationType="slide" onRequestClose={onClose}>
      <View style={styles.modalContainer}>
        <View style={styles.modalContent}>
          <Text style={styles.modalTitle}>选择剧集</Text>

          {episodes.length > episodeGroupSize && (
            <View style={styles.episodeGroupContainer}>
              {Array.from({ length: Math.ceil(episodes.length / episodeGroupSize) }, (_, groupIndex) => (
                <TouchableOpacity
                  key={groupIndex}
                  style={[
                    styles.episodeGroupButton,
                    selectedEpisodeGroup === groupIndex && styles.episodeGroupButtonSelected,
                  ]}
                  onPress={() => setSelectedEpisodeGroup(groupIndex)}
                >
                  <Text style={styles.episodeGroupButtonText}>
                    {`${groupIndex * episodeGroupSize + 1}-${Math.min(
                      (groupIndex + 1) * episodeGroupSize,
                      episodes.length
                    )}`}
                  </Text>
                </TouchableOpacity>
              ))}
            </View>
          )}
          <FlatList
            data={episodes.slice(
              selectedEpisodeGroup * episodeGroupSize,
              (selectedEpisodeGroup + 1) * episodeGroupSize
            )}
            numColumns={5}
            keyExtractor={(_, index) => `episode-${selectedEpisodeGroup * episodeGroupSize + index}`}
            renderItem={({ item, index }) => {
              const absoluteIndex = selectedEpisodeGroup * episodeGroupSize + index;
              return (
                <Pressable
                  style={({ focused }) => [
                    styles.episodeItem,
                    currentEpisodeIndex === absoluteIndex && styles.episodeItemSelected,
                    focused && styles.focusedButton,
                  ]}
                  onPress={() => onSelectEpisode(absoluteIndex)}
                  hasTVPreferredFocus={currentEpisodeIndex === absoluteIndex}
                >
                  <Text style={styles.episodeItemText}>{item.title || `第 ${absoluteIndex + 1} 集`}</Text>
                </Pressable>
              );
            }}
          />

          <Pressable style={({ focused }) => [styles.closeButton, focused && styles.focusedButton]} onPress={onClose}>
            <Text style={{ color: 'white' }}>关闭</Text>
          </Pressable>
        </View>
      </View>
    </Modal>
  );
};

const styles = StyleSheet.create({
  modalContainer: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'flex-end',
    backgroundColor: 'transparent',
  },
  modalContent: {
    width: 400,
    height: '100%',
    backgroundColor: 'rgba(0, 0, 0, 0.85)',
    padding: 20,
  },
  modalTitle: {
    color: 'white',
    marginBottom: 20,
    textAlign: 'center',
    fontSize: 18,
    fontWeight: 'bold',
  },
  episodeItem: {
    backgroundColor: '#333',
    paddingVertical: 12,
    borderRadius: 8,
    margin: 4,
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  episodeItemSelected: {
    backgroundColor: '#007bff',
  },
  episodeItemText: {
    color: 'white',
    fontSize: 14,
  },
  episodeGroupContainer: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    justifyContent: 'center',
    marginBottom: 15,
    paddingHorizontal: 10,
  },
  episodeGroupButton: {
    backgroundColor: '#444',
    paddingHorizontal: 12,
    paddingVertical: 6,
    borderRadius: 15,
    margin: 5,
  },
  episodeGroupButtonSelected: {
    backgroundColor: '#007bff',
  },
  episodeGroupButtonText: {
    color: 'white',
    fontSize: 12,
  },
  closeButton: {
    backgroundColor: '#333',
    padding: 15,
    borderRadius: 8,
    alignItems: 'center',
    marginTop: 20,
  },
  focusedButton: {
    backgroundColor: 'rgba(119, 119, 119, 0.9)',
    transform: [{ scale: 1.1 }],
  },
});