import { useState } from 'react'
import {
  View,
  Text,
  ScrollView,
  TouchableOpacity,
  StyleSheet,
  ActivityIndicator,
  Alert,
} from 'react-native'
import { useRouter } from 'expo-router'
import { useCollections } from '../../src/shared/hooks/useSupabaseData'
import { adminService } from '../../src/admin/services/adminService'
import type { Collection } from '../../src/shared/types'

export default function AdminCollectionsScreen() {
  const router = useRouter()
  const { collections, loading, refetch } = useCollections()
  const [updatingId, setUpdatingId] = useState<string | null>(null)

  const handleDelete = (collection: Collection) => {
    Alert.alert(
      'Delete Collection',
      `Are you sure you want to delete "${collection.title}"?`,
      [
        { text: 'Cancel', style: 'cancel' },
        { 
          text: 'Delete', 
          style: 'destructive',
          onPress: async () => {
            Alert.alert('Info', 'Collection deletion not yet implemented')
          }
        },
      ]
    )
  }

  if (loading) {
    return (
      <View style={[styles.container, styles.centered]}>
        <ActivityIndicator size="large" color="#FF6B35" />
      </View>
    )
  }

  return (
    <View style={styles.container}>
      <View style={styles.header}>
        <TouchableOpacity onPress={() => router.back()} style={styles.backButton}>
          <Text style={styles.backText}>← Back</Text>
        </TouchableOpacity>
        <Text style={styles.title}>Collections</Text>
        <TouchableOpacity style={styles.addButton}>
          <Text style={styles.addButtonText}>+ Add</Text>
        </TouchableOpacity>
      </View>

      <ScrollView style={styles.content}>
        {collections.map((collection) => (
          <View key={collection.id} style={styles.collectionCard}>
            <View style={styles.iconContainer}>
              <Text style={styles.icon}>{collection.icon}</Text>
            </View>
            
            <View style={styles.collectionInfo}>
              <Text style={styles.collectionTitle}>{collection.title}</Text>
              <Text style={styles.collectionDescription}>{collection.description}</Text>
              <Text style={styles.collectionMeta}>
                {collection.workoutIds.length} workouts
              </Text>
            </View>
            
            <View style={styles.actions}>
              <TouchableOpacity style={styles.editButton}>
                <Text style={styles.editText}>Edit</Text>
              </TouchableOpacity>
              <TouchableOpacity 
                style={[styles.deleteButton, updatingId === collection.id && styles.disabledButton]}
                onPress={() => handleDelete(collection)}
                disabled={updatingId === collection.id}
              >
                <Text style={styles.deleteText}>
                  {updatingId === collection.id ? '...' : 'Delete'}
                </Text>
              </TouchableOpacity>
            </View>
          </View>
        ))}
      </ScrollView>
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#000',
  },
  centered: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  header: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    padding: 20,
    paddingTop: 60,
    borderBottomWidth: 1,
    borderBottomColor: '#1C1C1E',
  },
  backButton: {
    padding: 8,
  },
  backText: {
    color: '#FF6B35',
    fontSize: 16,
  },
  title: {
    fontSize: 20,
    fontWeight: 'bold',
    color: '#fff',
  },
  addButton: {
    backgroundColor: '#FF6B35',
    paddingHorizontal: 16,
    paddingVertical: 8,
    borderRadius: 8,
  },
  addButtonText: {
    color: '#000',
    fontWeight: 'bold',
  },
  content: {
    flex: 1,
    padding: 16,
  },
  collectionCard: {
    backgroundColor: '#1C1C1E',
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
    flexDirection: 'row',
    alignItems: 'center',
  },
  iconContainer: {
    width: 48,
    height: 48,
    borderRadius: 24,
    backgroundColor: '#2C2C2E',
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: 12,
  },
  icon: {
    fontSize: 24,
  },
  collectionInfo: {
    flex: 1,
  },
  collectionTitle: {
    fontSize: 16,
    fontWeight: 'bold',
    color: '#fff',
    marginBottom: 4,
  },
  collectionDescription: {
    fontSize: 14,
    color: '#999',
    marginBottom: 4,
  },
  collectionMeta: {
    fontSize: 12,
    color: '#666',
  },
  actions: {
    flexDirection: 'row',
    gap: 8,
  },
  editButton: {
    backgroundColor: '#2C2C2E',
    paddingHorizontal: 12,
    paddingVertical: 8,
    borderRadius: 6,
  },
  editText: {
    color: '#5AC8FA',
  },
  deleteButton: {
    backgroundColor: '#2C2C2E',
    paddingHorizontal: 12,
    paddingVertical: 8,
    borderRadius: 6,
  },
  disabledButton: {
    opacity: 0.5,
  },
  deleteText: {
    color: '#FF3B30',
  },
})
