import { useEffect, useRef } from 'react';
import { Table, Select, Input, Tag } from 'antd';
import type { ColumnsType, TablePaginationConfig } from 'antd/es/table';
import { listAuditLogs, type AuditLogItem, type AuditLogQuery } from '../../api/auditLogs';
import { listUsers } from '../../api/users';
import { useThemeMode } from '../../hooks/useThemeMode';
import { usePaginatedData } from '../../hooks/usePaginatedData';

const RESOURCE_TYPE_OPTIONS = [
  { value: 'user', label: '用户' }, { value: 'role', label: '角色' },
  { value: 'position', label: '岗位' }, { value: 'organization', label: '组织' },
  { value: 'department', label: '部门' }, { value: 'process_instance', label: '流程实例' },
  { value: 'process_definition', label: '流程定义' }, { value: 'task', label: '流程任务' },
  { value: 'dictionary', label: '字典' }, { value: 'menu', label: '菜单' },
  { value: 'setting', label: '设置' }, { value: 'numbering_rule', label: '编号规则' },
  { value: 'journal_entry', label: '日记' }, { value: 'school_class', label: '班级' },
  { value: 'class_member', label: '班级成员' }, { value: 'topic_assignment', label: '主题布置' },
  { value: 'comment', label: '评论' }, { value: 'sticker_pack', label: '贴纸包' },
];

const ACTION_STYLES: Record<string, { bg: string; color: string; text: string }> = {
  create: { bg: '#ECFDF5', color: '#059669', text: '创建' },
  update: { bg: '#eff6ff', color: '#2563eb', text: '更新' },
  delete: { bg: '#FEF2F2', color: '#dc2626', text: '删除' },
};

function formatDateTime(value: string): string {
  return new Date(value).toLocaleString('zh-CN', {
    year: 'numeric', month: '2-digit', day: '2-digit',
    hour: '2-digit', minute: '2-digit', second: '2-digit',
  });
}

export default function AuditLogViewer() {
  const isDark = useThemeMode();
  const userNameCache = useRef<Record<string, string>>({});
  const cacheLoaded = useRef(false);

  const { data: logs, total, page, loading, filters, setFilters, refresh } = usePaginatedData<AuditLogItem, AuditLogQuery>(
    async (p, pageSize, query) => {
      const result = await listAuditLogs({ ...query, page: p, page_size: pageSize });
      return { data: result.data, total: result.total };
    },
    { pageSize: 20, defaultFilters: { page: 1, page_size: 20 } as unknown as AuditLogQuery, autoFetch: false },
  );

  // Load user name cache
  useEffect(() => {
    if (cacheLoaded.current) return;
    let cancelled = false;
    const loadAllUsers = async () => {
      try {
        let currentPage = 1;
        const pageSize = 100;
        let hasMore = true;
        while (hasMore && !cancelled) {
          const result = await listUsers(currentPage, pageSize);
          for (const user of result.data) {
            userNameCache.current[user.id] = user.display_name || user.username;
          }
          hasMore = result.data.length >= pageSize;
          currentPage += 1;
        }
        if (!cancelled) cacheLoaded.current = true;
      } catch { /* silent */ }
    };
    loadAllUsers();
    return () => { cancelled = true; };
  }, []);

  useEffect(() => { refresh(1); }, []);

  const handleFilterChange = (field: keyof AuditLogQuery, value: string | undefined) => {
    setFilters((prev) => ({ ...prev, [field]: value || undefined, page: 1 }));
  };

  const columns: ColumnsType<AuditLogItem> = [
    {
      title: '操作', dataIndex: 'action', key: 'action', width: 100,
      render: (action: string) => {
        const info = ACTION_STYLES[action] || { bg: '#f8fafc', color: '#475569', text: action };
        return <Tag style={{ background: info.bg, border: 'none', color: info.color, fontWeight: 500 }}>{info.text}</Tag>;
      },
    },
    {
      title: '资源类型', dataIndex: 'resource_type', key: 'resource_type', width: 120,
      render: (v: string) => <Tag style={{ background: isDark ? '#0f172a' : '#f8fafc', border: 'none', color: isDark ? '#CBD5E1' : '#475569' }}>{v}</Tag>,
    },
    {
      title: '资源 ID', dataIndex: 'resource_id', key: 'resource_id', width: 200, ellipsis: true,
      render: (v: string) => <span style={{ fontFamily: 'monospace', fontSize: 12, color: isDark ? '#94a3b8' : '#475569' }}>{v}</span>,
    },
    {
      title: '操作用户', dataIndex: 'user_id', key: 'user_id', width: 200, ellipsis: true,
      render: (v: string) => {
        const name = userNameCache.current[v];
        return <span title={v} style={{ fontSize: 13, color: isDark ? '#CBD5E1' : '#334155' }}>{name || v}</span>;
      },
    },
    {
      title: '时间', dataIndex: 'created_at', key: 'created_at', width: 180,
      render: (value: string) => <span style={{ color: isDark ? '#475569' : '#94a3b8', fontSize: 13 }}>{formatDateTime(value)}</span>,
    },
  ];

  return (
    <div>
      {/* 筛选工具栏 */}
      <div style={{
        display: 'flex', alignItems: 'center', gap: 12, marginBottom: 16, padding: 12,
        background: isDark ? '#111827' : '#FFFFFF', borderRadius: 10,
        border: `1px solid ${isDark ? '#0f172a' : '#f8fafc'}`,
      }}>
        <Select
          allowClear placeholder="资源类型" style={{ width: 160 }}
          options={RESOURCE_TYPE_OPTIONS}
          value={filters.resource_type}
          onChange={(value) => handleFilterChange('resource_type', value)}
        />
        <Input
          allowClear placeholder="操作用户 ID" style={{ width: 240 }}
          value={filters.user_id ?? ''}
          onChange={(e) => handleFilterChange('user_id', e.target.value)}
        />
        <span style={{ fontSize: 13, color: isDark ? '#475569' : '#94a3b8', marginLeft: 'auto' }}>共 {total} 条日志</span>
      </div>

      {/* 表格 */}
      <div style={{
        background: isDark ? '#111827' : '#FFFFFF', borderRadius: 12,
        border: `1px solid ${isDark ? '#0f172a' : '#f8fafc'}`, overflow: 'hidden',
      }}>
        <Table
          rowKey="id" columns={columns} dataSource={logs} loading={loading}
          onChange={(pagination: TablePaginationConfig) => refresh(pagination.current)}
          pagination={{
            current: page, pageSize: 20, total,
            showSizeChanger: true, showTotal: (t) => `共 ${t} 条`,
          }}
          scroll={{ x: 900 }}
        />
      </div>
    </div>
  );
}