/**
 * 聊天输入框组件
 * 支持响应式布局（宽屏下居中显示）
 */

import React, { useMemo } from 'react';
import { View, TouchableOpacity, TextInput, ActivityIndicator, ScrollView, StyleSheet, Image as RNImage } from 'react-native';
import { MaterialCommunityIcons } from '@expo/vector-icons';
import { Text } from '../../../../components/common';
import { useAppColors } from '../../../../theme';
import { useChatScreenStyles } from './styles';
import { useBreakpointGTE } from '../../../../hooks/useResponsive';
import { ChatInputProps, GroupMessage, SenderInfo } from './types';
import { extractTextFromSegments } from '../../../../types/dto';

export const ChatInput: React.FC<ChatInputProps & {
  currentUser: { id?: string; nickname?: string; avatar?: string | null } | null;
  otherUser: { id?: string; nickname?: string; avatar?: string | null } | null;
  getSenderInfo: (senderId: string) => SenderInfo;
}> = ({
  inputText,
  onInputChange,
  onSend,
  onToggleEmoji,
  onToggleMore,
  activePanel,
  isComposerBusy,
  isMuted,
  isGroupChat,
  muteAll,
  replyingTo,
  onCancelReply,
  onFocus,
  restrictionHint,
  disableMore = false,
  pendingAttachments = [],
  onRemovePendingAttachment,
  currentUser,
  otherUser,
  getSenderInfo,
}) => {
  const colors = useAppColors();
  const styles = useChatScreenStyles();
  const isDisabled = isGroupChat && isMuted;

  // 获取当前用户ID
  const currentUserId = currentUser?.id || '';

  // 响应式布局
  const isWideScreen = useBreakpointGTE('lg');

  const inputContainerStyle = useMemo(() => ([
    styles.inputContainer,
    isWideScreen ? { maxWidth: 900, alignSelf: 'center' as const, width: '100%' as const } : null,
  ]), [isWideScreen, styles.inputContainer]);

  const canSend =
    (!!inputText.trim() || pendingAttachments.length > 0) &&
    !isComposerBusy &&
    !isDisabled;

  // 回复预览组件 - 定义在内部以访问 styles
  const ReplyPreview: React.FC<{
    replyingTo: GroupMessage;
    onCancel: () => void;
  }> = ({ replyingTo, onCancel }) => {
    const senderInfo = replyingTo.sender_id === currentUserId
      ? { nickname: '我', avatar: currentUser?.avatar }
      : isGroupChat
        ? getSenderInfo(replyingTo.sender_id)
        : { nickname: otherUser?.nickname || '对方', avatar: otherUser?.avatar };

    return (
      <View style={styles.replyPreviewContainer}>
        <View style={styles.replyPreviewContent}>
          <MaterialCommunityIcons name="reply" size={16} color={colors.primary.main} />
          <View style={styles.replyPreviewText}>
            <Text style={styles.replyPreviewName}>回复 {senderInfo.nickname}</Text>
            <Text style={styles.replyPreviewMessage} numberOfLines={1}>
              {(() => {
                const segs = replyingTo.segments;
                const imgCount = segs?.filter(seg => seg.type === 'image').length ?? 0;
                const raw = extractTextFromSegments(segs);
                if (imgCount > 1) {
                  const textPart = raw.replace(/\[图片\]/g, '').replace(/\s+/g, ' ').trim();
                  return textPart ? `${textPart} [${imgCount}张图片]` : `[${imgCount}张图片]`;
                }
                return raw;
              })()}
            </Text>
          </View>
        </View>
        <TouchableOpacity onPress={onCancel} style={styles.replyPreviewClose}>
          <MaterialCommunityIcons name="close" size={18} color="#999" />
        </TouchableOpacity>
      </View>
    );
  };

  return (
    <View style={inputContainerStyle}>
      {/* 回复预览 */}
      {replyingTo && (
        <ReplyPreview
          replyingTo={replyingTo}
          onCancel={onCancelReply}
        />
      )}
      
      {/* 禁言提示 */}
      {isGroupChat && isMuted && (
        <View style={styles.mutedBanner}>
          <MaterialCommunityIcons name="minus-circle" size={16} color="#FF3B30" />
          <Text style={styles.mutedBannerText}>
            {muteAll ? '全员禁言中，暂无法发送消息' : '你已被禁言，暂无法发送消息'}
          </Text>
        </View>
      )}

      {!!restrictionHint && (
        <View style={styles.mutedBanner}>
          <MaterialCommunityIcons name="information-outline" size={16} color={colors.warning.main} />
          <Text style={styles.mutedBannerText}>{restrictionHint}</Text>
        </View>
      )}

      {pendingAttachments.length > 0 && (
        <ScrollView
          horizontal
          showsHorizontalScrollIndicator={false}
          style={attachmentStyles.stripScroll}
          contentContainerStyle={attachmentStyles.stripContent}
        >
          {pendingAttachments.map(item => (
            <View key={item.id} style={attachmentStyles.thumbWrap}>
              <RNImage source={{ uri: item.uri }} style={attachmentStyles.thumb} />
              {!isDisabled && onRemovePendingAttachment ? (
                <TouchableOpacity
                  style={attachmentStyles.removeBtn}
                  onPress={() => onRemovePendingAttachment(item.id)}
                  hitSlop={{ top: 8, bottom: 8, left: 8, right: 8 }}
                >
                  <MaterialCommunityIcons name="close-circle" size={22} color="rgba(0,0,0,0.55)" />
                </TouchableOpacity>
              ) : null}
            </View>
          ))}
        </ScrollView>
      )}
      
      <View style={[styles.inputInner, isDisabled && styles.inputInnerMuted]}>
        <TouchableOpacity 
          style={[styles.iconButton, activePanel === 'emoji' && styles.iconButtonActive]}
          onPress={onToggleEmoji}
          disabled={isDisabled}
        >
          <MaterialCommunityIcons 
            name={activePanel === 'emoji' ? "keyboard" : "emoticon-happy-outline"} 
            size={26} 
            color={isDisabled ? '#CCC' : (activePanel === 'emoji' ? colors.primary.main : '#666')} 
          />
        </TouchableOpacity>
        
        <View style={styles.inputBox}>
          <TextInput
            style={[styles.input, isDisabled && styles.inputMuted]}
            placeholder={isGroupChat ? (isMuted ? (muteAll ? "全员禁言中..." : "你已被禁言...") : "发送消息，@提及成员...") : "发送消息..."}
            placeholderTextColor={isDisabled ? '#CCC' : '#999'}
            value={inputText}
            onChangeText={onInputChange}
            multiline
            maxLength={500}
            returnKeyType="send"
            onSubmitEditing={onSend}
            blurOnSubmit={false}
            editable={!isDisabled}
            onFocus={onFocus}
            // 确保光标可见
            cursorColor={colors.primary.main}
            selectionColor={`${colors.primary.main}40`}
          />
        </View>
        
        {canSend ? (
          <TouchableOpacity
            style={styles.sendButtonActive}
            onPress={onSend}
            activeOpacity={0.8}
          >
            <MaterialCommunityIcons name="send" size={20} color="#FFF" />
          </TouchableOpacity>
        ) : isComposerBusy && !isDisabled ? (
          <TouchableOpacity
            style={[styles.sendButtonActive, styles.sendButtonDisabled]}
            disabled
          >
            <ActivityIndicator size="small" color="#FFF" />
          </TouchableOpacity>
        ) : (
          <TouchableOpacity 
            style={[styles.iconButton, activePanel === 'more' && styles.iconButtonActive]}
            onPress={onToggleMore}
            disabled={isDisabled || disableMore}
          >
            <MaterialCommunityIcons 
              name={activePanel === 'more' ? "close-circle" : "plus-circle-outline"} 
              size={26} 
              color={isDisabled || disableMore ? '#CCC' : (activePanel === 'more' ? colors.primary.main : '#666')} 
            />
          </TouchableOpacity>
        )}
      </View>
    </View>
  );
};

const attachmentStyles = StyleSheet.create({
  stripScroll: {
    maxHeight: 88,
    marginBottom: 6,
    paddingHorizontal: 4,
  },
  stripContent: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: 4,
  },
  thumbWrap: {
    position: 'relative',
    marginRight: 8,
  },
  thumb: {
    width: 72,
    height: 72,
    borderRadius: 10,
    backgroundColor: '#E8EAED',
  },
  removeBtn: {
    position: 'absolute',
    top: -6,
    right: -6,
    backgroundColor: '#FFF',
    borderRadius: 12,
  },
});

export default ChatInput;