/**
 * GroupInfoPanel.tsx
 * 群信息侧边栏组件
 * 大屏幕模式下从右侧滑入显示
 * 实现手机端群信息界面的核心功能
 */

import React, { useEffect, useState, useCallback, useMemo } from 'react';
import {
  View,
  StyleSheet,
  TouchableOpacity,
  ScrollView,
  Dimensions,
  Animated,
  Alert,
} from 'react-native';
import { MaterialCommunityIcons } from '@expo/vector-icons';
import { Avatar, Text } from '../../../../components/common';
import { useAppColors, spacing, fontSizes, shadows, type AppColors } from '../../../../theme';
import { GroupMemberResponse, GroupResponse, GroupAnnouncementResponse } from '../../../../types/dto';
import { useBreakpointGTE } from '../../../../hooks/useResponsive';
import { groupManager } from '../../../../stores/groupManager';
import { groupService } from '../../../../services/groupService';

const { width: screenWidth } = Dimensions.get('window');
const PANEL_WIDTH = 360;

interface GroupInfoPanelProps {
  visible: boolean;
  groupId?: string;
  groupInfo: GroupResponse | null;
  conversationId?: string;
  isPinned?: boolean;
  currentUserId?: string;
  onClose: () => void;
  onTogglePin?: (pinned: boolean) => void;
  onLeaveGroup?: () => void;
  onInviteMembers?: () => void;
  onViewAllMembers?: () => void;
}

export const GroupInfoPanel: React.FC<GroupInfoPanelProps> = ({
  visible,
  groupId,
  groupInfo,
  conversationId,
  isPinned,
  currentUserId,
  onClose,
  onTogglePin,
  onLeaveGroup,
  onInviteMembers,
  onViewAllMembers,
}) => {
  const colors = useAppColors();
  const styles = useMemo(() => createGroupInfoPanelStyles(colors), [colors]);
  const isWideScreen = useBreakpointGTE('lg');
  const slideAnim = React.useRef(new Animated.Value(PANEL_WIDTH)).current;
  const fadeAnim = React.useRef(new Animated.Value(0)).current;
  const [members, setMembers] = useState<GroupMemberResponse[]>([]);
  const [announcements, setAnnouncements] = useState<GroupAnnouncementResponse[]>([]);
  const [loading, setLoading] = useState(false);
  const [showAllMembers, setShowAllMembers] = useState(false);
  const [allMembers, setAllMembers] = useState<GroupMemberResponse[]>([]);
  const [loadingMoreMembers, setLoadingMoreMembers] = useState(false);

  // 加载群成员（初始只加载10个）
  const loadMembers = useCallback(async () => {
    if (!groupId) return;
    try {
      setLoading(true);
      const response = await groupManager.getMembers(groupId, 1, 10);
      setMembers(response.list || []);
    } catch (error) {
      console.error('[GroupInfoPanel] 加载成员失败:', error);
    } finally {
      setLoading(false);
    }
  }, [groupId]);

  // 加载全部群成员
  const loadAllMembers = useCallback(async () => {
    if (!groupId) return;
    try {
      setLoadingMoreMembers(true);
      const response = await groupManager.getMembers(groupId, 1, 100);
      setAllMembers(response.list || []);
      setShowAllMembers(true);
    } catch (error) {
      console.error('[GroupInfoPanel] 加载全部成员失败:', error);
    } finally {
      setLoadingMoreMembers(false);
    }
  }, [groupId]);

  // 加载群公告
  const loadAnnouncements = useCallback(async () => {
    if (!groupId) return;
    try {
      const response = await groupService.getAnnouncements(groupId, 1, 10);
      setAnnouncements(response.list || []);
    } catch (error) {
      console.error('[GroupInfoPanel] 加载公告失败:', error);
    }
  }, [groupId]);

  // 每次打开面板时重置状态
  useEffect(() => {
    if (visible) {
      setShowAllMembers(false);
      setAllMembers([]);
    }
  }, [visible]);

  useEffect(() => {
    if (visible && groupId) {
      loadMembers();
      loadAnnouncements();
    }
  }, [visible, groupId, loadMembers, loadAnnouncements]);

  useEffect(() => {
    if (visible) {
      Animated.parallel([
        Animated.timing(slideAnim, {
          toValue: 0,
          duration: 300,
          useNativeDriver: true,
        }),
        Animated.timing(fadeAnim, {
          toValue: 1,
          duration: 300,
          useNativeDriver: true,
        }),
      ]).start();
    } else {
      Animated.parallel([
        Animated.timing(slideAnim, {
          toValue: PANEL_WIDTH,
          duration: 300,
          useNativeDriver: true,
        }),
        Animated.timing(fadeAnim, {
          toValue: 0,
          duration: 300,
          useNativeDriver: true,
        }),
      ]).start();
    }
  }, [visible, slideAnim, fadeAnim]);

  if (!isWideScreen) {
    return null;
  }

  // 获取加群方式文本
  const getJoinTypeText = (joinType?: number): string => {
    switch (joinType) {
      case 0:
        return '允许任何人加入';
      case 1:
        return '需要管理员审批';
      case 2:
        return '不允许任何人加入';
      default:
        return '未知';
    }
  };

  return (
    <>
      {/* 遮罩层 */}
      {visible && (
        <Animated.View style={[styles.overlay, { opacity: fadeAnim }]}>
          <TouchableOpacity
            style={styles.overlayTouchable}
            onPress={onClose}
            activeOpacity={1}
          />
        </Animated.View>
      )}
      
      {/* 侧边栏面板 */}
      <Animated.View
        style={[
          styles.panel,
          {
            transform: [{ translateX: slideAnim }],
          },
        ]}
      >
        {/* 头部 */}
        <View style={styles.header}>
          <Text style={styles.headerTitle}>群信息</Text>
          <TouchableOpacity onPress={onClose} style={styles.closeButton}>
            <MaterialCommunityIcons name="close" size={24} color="#333" />
          </TouchableOpacity>
        </View>

        <ScrollView style={styles.content} showsVerticalScrollIndicator={false}>
          {/* 群头像和名称 */}
          <View style={styles.groupInfoSection}>
            <Avatar
              source={groupInfo?.avatar}
              size={80}
              name={groupInfo?.name || '群聊'}
            />
            <Text style={styles.groupName}>{groupInfo?.name || '群聊'}</Text>
            <Text style={styles.memberCount}>
              {groupInfo?.member_count || members.length || 0} 位成员
            </Text>
            {groupInfo?.join_type !== undefined && (
              <Text style={styles.joinType}>
                {getJoinTypeText(groupInfo.join_type)}
              </Text>
            )}
            {/* 邀请新成员按钮 */}
            {onInviteMembers && (
              <TouchableOpacity
                style={styles.inviteButton}
                onPress={onInviteMembers}
                activeOpacity={0.7}
              >
                <MaterialCommunityIcons name="account-plus" size={18} color={colors.primary.main} />
                <Text style={styles.inviteButtonText}>邀请新成员</Text>
              </TouchableOpacity>
            )}
          </View>

          {/* 分割线 */}
          <View style={styles.divider} />

          {/* 群公告 */}
          {announcements.length > 0 && (
            <View style={styles.section}>
              <View style={styles.sectionHeader}>
                <MaterialCommunityIcons name="bullhorn" size={18} color={colors.warning.main} />
                <Text style={styles.sectionTitle}>群公告</Text>
              </View>
              <View style={styles.noticeBox}>
                <Text style={styles.noticeText}>{announcements[0].content}</Text>
                <Text style={styles.noticeTime}>
                  {new Date(announcements[0].created_at).toLocaleDateString()}
                </Text>
              </View>
            </View>
          )}

          {/* 群简介 */}
          {groupInfo?.description && (
            <View style={styles.section}>
              <Text style={styles.sectionTitle}>群简介</Text>
              <View style={styles.descriptionBox}>
                <Text style={styles.description}>{groupInfo.description}</Text>
              </View>
            </View>
          )}

          {/* 群成员列表 */}
          <View style={styles.section}>
            <View style={styles.memberListHeader}>
              <Text style={styles.sectionTitle}>成员列表 ({groupInfo?.member_count || members.length})</Text>
              {onViewAllMembers && !showAllMembers && members.length >= 10 && (
                <TouchableOpacity onPress={loadAllMembers} style={styles.viewAllButton} disabled={loadingMoreMembers}>
                  <Text style={styles.viewAllText}>
                    {loadingMoreMembers ? '加载中...' : '查看全部'}
                  </Text>
                  <MaterialCommunityIcons name="chevron-right" size={16} color={colors.primary.main} />
                </TouchableOpacity>
              )}
              {onViewAllMembers && showAllMembers && (
                <TouchableOpacity onPress={() => setShowAllMembers(false)} style={styles.viewAllButton}>
                  <Text style={styles.viewAllText}>收起</Text>
                  <MaterialCommunityIcons name="chevron-up" size={16} color={colors.primary.main} />
                </TouchableOpacity>
              )}
            </View>
            <View style={styles.memberList}>
              {(showAllMembers ? allMembers : members).map((member) => (
                <View key={member.id || member.user_id} style={styles.memberItem}>
                  <Avatar
                    source={member.user?.avatar}
                    size={44}
                    name={member.nickname || member.user?.nickname || '用户'}
                  />
                  <View style={styles.memberInfo}>
                    <Text style={styles.memberName} numberOfLines={1}>
                      {member.nickname || member.user?.nickname || '用户'}
                    </Text>
                    {member.role === 'owner' && (
                      <Text style={styles.ownerBadge}>群主</Text>
                    )}
                    {member.role === 'admin' && (
                      <Text style={styles.adminBadge}>管理员</Text>
                    )}
                  </View>
                </View>
              ))}
            </View>
          </View>

          {/* 群信息 */}
          <View style={styles.section}>
            <Text style={styles.sectionTitle}>群信息</Text>
            <View style={styles.infoRow}>
              <Text style={styles.infoLabel}>群号</Text>
              <Text style={styles.infoValue}>{groupInfo?.id || '-'}</Text>
            </View>
            <View style={styles.infoRow}>
              <Text style={styles.infoLabel}>创建时间</Text>
              <Text style={styles.infoValue}>
                {groupInfo?.created_at
                  ? new Date(groupInfo.created_at).toLocaleDateString('zh-CN')
                  : '-'}
              </Text>
            </View>
            <View style={styles.infoRow}>
              <Text style={styles.infoLabel}>全员禁言</Text>
              <Text style={styles.infoValue}>
                {groupInfo?.mute_all ? '已开启' : '已关闭'}
              </Text>
            </View>
          </View>

          {/* 操作按钮 */}
          <View style={styles.actionSection}>
            {conversationId && onTogglePin && (
              <TouchableOpacity
                style={styles.actionButton}
                onPress={() => onTogglePin(!isPinned)}
                activeOpacity={0.7}
              >
                <MaterialCommunityIcons
                  name={isPinned ? "pin-off" : "pin"}
                  size={22}
                  color={colors.primary.main}
                />
                <Text style={styles.actionButtonText}>
                  {isPinned ? '取消置顶' : '置顶群聊'}
                </Text>
              </TouchableOpacity>
            )}
            
            {onLeaveGroup && (
              <TouchableOpacity
                style={[styles.actionButton, styles.leaveButton]}
                onPress={onLeaveGroup}
                activeOpacity={0.7}
              >
                <MaterialCommunityIcons
                  name="logout"
                  size={22}
                  color={colors.error.main}
                />
                <Text style={[styles.actionButtonText, styles.leaveButtonText]}>
                  退出群聊
                </Text>
              </TouchableOpacity>
            )}
          </View>
        </ScrollView>
      </Animated.View>
    </>
  );
};

function createGroupInfoPanelStyles(colors: AppColors) {
  return StyleSheet.create({
  overlay: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: 'rgba(0, 0, 0, 0.3)',
    zIndex: 100,
  },
  overlayTouchable: {
    flex: 1,
  },
  panel: {
    position: 'absolute',
    right: 0,
    top: 0,
    bottom: 0,
    width: PANEL_WIDTH,
    backgroundColor: colors.background.paper,
    zIndex: 101,
    ...shadows.lg,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: spacing.md,
    paddingVertical: spacing.md,
    borderBottomWidth: 1,
    borderBottomColor: colors.divider,
  },
  headerTitle: {
    fontSize: fontSizes.xl,
    fontWeight: '600',
    color: colors.text.primary,
  },
  closeButton: {
    padding: spacing.xs,
  },
  content: {
    flex: 1,
  },
  groupInfoSection: {
    alignItems: 'center',
    paddingVertical: spacing.xl,
  },
  groupName: {
    fontSize: fontSizes.xl,
    fontWeight: '600',
    color: colors.text.primary,
    marginTop: spacing.md,
  },
  memberCount: {
    fontSize: fontSizes.md,
    color: colors.text.secondary,
    marginTop: spacing.xs,
  },
  joinType: {
    fontSize: fontSizes.sm,
    color: colors.primary.main,
    marginTop: spacing.xs,
  },
  inviteButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: spacing.sm,
    paddingHorizontal: spacing.md,
    backgroundColor: colors.primary.light + '15',
    borderRadius: 20,
    marginTop: spacing.md,
    borderWidth: 1,
    borderColor: colors.primary.light,
  },
  inviteButtonText: {
    fontSize: fontSizes.sm,
    color: colors.primary.main,
    marginLeft: spacing.xs,
    fontWeight: '500',
  },
  divider: {
    height: 1,
    backgroundColor: colors.divider,
    marginHorizontal: spacing.md,
  },
  section: {
    padding: spacing.md,
  },
  sectionHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: spacing.sm,
  },
  sectionTitle: {
    fontSize: fontSizes.md,
    fontWeight: '600',
    color: colors.text.primary,
    marginLeft: spacing.xs,
  },
  noticeBox: {
    backgroundColor: colors.chat.tipBg,
    padding: spacing.md,
    borderRadius: 8,
    borderLeftWidth: 3,
    borderLeftColor: colors.warning.main,
  },
  noticeText: {
    fontSize: fontSizes.sm,
    color: colors.text.secondary,
    lineHeight: 20,
  },
  noticeTime: {
    fontSize: fontSizes.xs,
    color: colors.text.hint,
    marginTop: spacing.xs,
    textAlign: 'right',
  },
  descriptionBox: {
    backgroundColor: colors.chat.surfaceMuted,
    padding: spacing.md,
    borderRadius: 8,
  },
  description: {
    fontSize: fontSizes.sm,
    color: colors.text.secondary,
    lineHeight: 20,
  },
  memberList: {
    gap: spacing.sm,
  },
  memberListHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: spacing.sm,
  },
  viewAllButton: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  viewAllText: {
    fontSize: fontSizes.sm,
    color: colors.primary.main,
  },
  memberItem: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: spacing.xs,
  },
  memberInfo: {
    flex: 1,
    marginLeft: spacing.sm,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
  },
  memberName: {
    fontSize: fontSizes.md,
    color: colors.text.primary,
    flex: 1,
  },
  ownerBadge: {
    fontSize: fontSizes.xs,
    color: colors.warning.main,
    marginLeft: spacing.xs,
    backgroundColor: colors.warning.light + '30',
    paddingHorizontal: 6,
    paddingVertical: 2,
    borderRadius: 4,
  },
  adminBadge: {
    fontSize: fontSizes.xs,
    color: colors.primary.main,
    marginLeft: spacing.xs,
    backgroundColor: colors.primary.light + '30',
    paddingHorizontal: 6,
    paddingVertical: 2,
    borderRadius: 4,
  },
  moreMembers: {
    fontSize: fontSizes.sm,
    color: colors.text.secondary,
    textAlign: 'center',
    paddingVertical: spacing.sm,
  },
  infoRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    paddingVertical: spacing.sm,
    borderBottomWidth: 1,
    borderBottomColor: colors.chat.borderHairline,
  },
  infoLabel: {
    fontSize: fontSizes.sm,
    color: colors.text.secondary,
  },
  infoValue: {
    fontSize: fontSizes.sm,
    color: colors.text.primary,
  },
  actionSection: {
    padding: spacing.md,
    paddingBottom: spacing.xl,
  },
  actionButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: spacing.md,
    backgroundColor: colors.primary.light + '15',
    borderRadius: 12,
    marginBottom: spacing.sm,
    borderWidth: 1,
    borderColor: colors.primary.light,
  },
  actionButtonText: {
    fontSize: fontSizes.md,
    fontWeight: '600',
    color: colors.primary.main,
    marginLeft: spacing.sm,
  },
  leaveButton: {
    backgroundColor: colors.error.light + '15',
    borderColor: colors.error.light,
  },
  leaveButtonText: {
    color: colors.error.main,
  },
  });
}

export default GroupInfoPanel;
