import { ChatBubble, TimeSeparator, TypingIndicator } from '@/components/chat/ChatBubble';
import { ChatInput } from '@/components/chat/ChatInput';
import { AppColors } from '@/constants/theme';
import {
  getCurrentTimeString,
  getRandomAIResponse,
  Message,
  mockConversations,
  mockMessages,
} from '@/data/mockData';
import { Ionicons } from '@expo/vector-icons';
import { router, useLocalSearchParams } from 'expo-router';
import React, { useEffect, useRef, useState } from 'react';
import {
  KeyboardAvoidingView,
  Platform,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';

export default function ChatDetailScreen() {
  const { id } = useLocalSearchParams<{ id: string }>();
  const scrollViewRef = useRef<ScrollView>(null);
  
  const [messages, setMessages] = useState<Message[]>(mockMessages);
  const [isTyping, setIsTyping] = useState(false);

  // Find conversation info
  const conversation = mockConversations.find(c => c.id === id) || mockConversations[0];

  // Scroll to bottom when messages change
  useEffect(() => {
    setTimeout(() => {
      scrollViewRef.current?.scrollToEnd({ animated: true });
    }, 100);
  }, [messages, isTyping]);

  const handleSendMessage = (text: string) => {
    // Add user message
    const userMessage: Message = {
      id: `m${Date.now()}`,
      conversationId: id || '1',
      senderType: 'user',
      contentType: 'text',
      content: text,
      timestamp: getCurrentTimeString(),
    };
    
    setMessages(prev => [...prev, userMessage]);

    // Simulate AI typing
    setTimeout(() => {
      setIsTyping(true);
    }, 500);

    // Add AI response after delay
    setTimeout(() => {
      setIsTyping(false);
      const aiMessage: Message = {
        id: `m${Date.now() + 1}`,
        conversationId: id || '1',
        senderType: 'ai',
        contentType: 'text',
        content: getRandomAIResponse(),
        timestamp: getCurrentTimeString(),
      };
      setMessages(prev => [...prev, aiMessage]);
    }, 1500 + Math.random() * 1000);
  };

  const handleBack = () => {
    router.back();
  };

  return (
    <SafeAreaView style={styles.container} edges={['top']}>
      {/* Header */}
      <View style={styles.header}>
        <TouchableOpacity 
          style={styles.backButton} 
          onPress={handleBack}
          activeOpacity={0.7}
        >
          <Ionicons name="chevron-back" size={24} color={AppColors.white} />
        </TouchableOpacity>
        
        <View style={styles.headerTitleArea}>
          <Text style={styles.headerTitle}>{conversation.title}</Text>
          <Text style={styles.headerStatus}>在线</Text>
        </View>
      </View>

      {/* Messages */}
      <KeyboardAvoidingView
        style={styles.messageContainer}
        behavior={Platform.OS === 'ios' ? 'padding' : undefined}
        keyboardVerticalOffset={0}
      >
        <ScrollView
          ref={scrollViewRef}
          style={styles.messageList}
          contentContainerStyle={styles.messageListContent}
          showsVerticalScrollIndicator={false}
          keyboardShouldPersistTaps="handled"
        >
          <TimeSeparator time="今天 14:30" />
          
          {messages.map((message) => (
            <ChatBubble key={message.id} message={message} />
          ))}
          
          {isTyping && <TypingIndicator />}
        </ScrollView>

        {/* Input Area */}
        <ChatInput
          onSendMessage={handleSendMessage}
          onVoicePress={() => {
            // Voice input placeholder
            console.log('Voice input pressed');
          }}
          onEmojiPress={() => {
            // Emoji picker placeholder
            console.log('Emoji picker pressed');
          }}
          onMorePress={() => {
            // More options placeholder
            console.log('More options pressed');
          }}
        />
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: AppColors.mediumPurple,
  },
  header: {
    height: 62,
    flexDirection: 'row',
    alignItems: 'center',
    paddingHorizontal: 16,
    backgroundColor: AppColors.mediumPurple,
  },
  backButton: {
    width: 40,
    height: 40,
    borderRadius: 12,
    backgroundColor: 'rgba(255, 255, 255, 0.2)',
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerTitleArea: {
    flex: 1,
    alignItems: 'center',
    marginRight: 40, // Balance the back button
  },
  headerTitle: {
    fontSize: 18,
    fontWeight: '600',
    color: AppColors.white,
  },
  headerStatus: {
    fontSize: 12,
    color: 'rgba(255, 255, 255, 0.8)',
    marginTop: 2,
  },
  messageContainer: {
    flex: 1,
    backgroundColor: AppColors.cream,
  },
  messageList: {
    flex: 1,
    backgroundColor: AppColors.cream,
  },
  messageListContent: {
    paddingVertical: 16,
  },
});