/**
 * filekorolheader: 企业审核页面 - 企业注册审核管理页面
 * 功能：企业审核列表、搜索筛选、审核操作、详情查看
 * 路径：/central-config/tenant/enterprise-audit
 * 规范：遵循crop-x/docs/开发项目规范.md，使用useReducer状态管理，API集成，模块化组件，SearchFormPagination重构
 */
'use client';

import { useReducer, useEffect, useMemo, useRef, useCallback } from 'react';
import { toast } from 'sonner';
import { Building2, RefreshCw, Eye, Check, X } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';

import { SearchFormPagination, type SearchFieldConfig, type TableColumnConfig } from '@/components/common/searchFormPagination';
import { fetchTenantsForAudit, auditTenant, transformTenantData, TenantsQueryParams, Enterprise } from './components/enterpriseAuditApi';
import { AuditStatsCards } from './components/AuditStatsCards';
import { EnterpriseDetailDialog } from './components/EnterpriseDetailDialog';

// 审核状态管理
interface AuditState {
  enterprises: Enterprise[];
  loading: boolean;
  error: string | null;
  pagination: {
    page: number;
    size: number;
    total: number;
    totalPages: number;
    hasNext: boolean;
    hasPrev: boolean;
  };
  filters: {
    search: string;
    audit_status: string;
  };
  sortBy?: string;
  sortOrder: 'asc' | 'desc';
  selectedEnterprise: Enterprise | null;
  showDetailDialog: boolean;
  auditReason: string;
  actionLoading: boolean;
}

type AuditAction =
  | { type: 'SET_ENTERPRISES'; payload: { data: Enterprise[]; pagination: AuditState['pagination'] } }
  | { type: 'SET_LOADING'; payload: boolean }
  | { type: 'SET_ERROR'; payload: string | null }
  | { type: 'SET_FILTERS'; payload: Partial<AuditState['filters']> }
  | { type: 'SET_SORT'; payload: { sortBy?: string; sortOrder: 'asc' | 'desc' } }
  | { type: 'SET_PAGINATION'; payload: Partial<AuditState['pagination']> }
  | { type: 'SET_SELECTED_ENTERPRISE'; payload: Enterprise | null }
  | { type: 'TOGGLE_DETAIL_DIALOG'; payload: boolean }
  | { type: 'SET_AUDIT_REASON'; payload: string }
  | { type: 'SET_ACTION_LOADING'; payload: boolean }
  | { type: 'REFRESH_DATA' };

const auditReducer = (state: AuditState, action: AuditAction): AuditState => {
  switch (action.type) {
    case 'SET_ENTERPRISES':
      return {
        ...state,
        enterprises: action.payload.data,
        pagination: action.payload.pagination,
        loading: false,
        error: null,
      };
    case 'SET_LOADING':
      return { ...state, loading: action.payload };
    case 'SET_ERROR':
      return { ...state, error: action.payload, loading: false };
    case 'SET_FILTERS':
      return { ...state, filters: { ...state.filters, ...action.payload } };
    case 'SET_SORT':
      return { ...state, sortBy: action.payload.sortBy, sortOrder: action.payload.sortOrder };
    case 'SET_PAGINATION':
      return { ...state, pagination: { ...state.pagination, ...action.payload } };
    case 'SET_SELECTED_ENTERPRISE':
      return { ...state, selectedEnterprise: action.payload };
    case 'TOGGLE_DETAIL_DIALOG':
      return { ...state, showDetailDialog: !state.showDetailDialog };
    case 'SET_AUDIT_REASON':
      return { ...state, auditReason: action.payload };
    case 'SET_ACTION_LOADING':
      return { ...state, actionLoading: action.payload };
    case 'REFRESH_DATA':
      return { ...state, error: null };
    default:
      return state;
  }
};

const initialState: AuditState = {
  enterprises: [],
  loading: false,
  error: null,
  pagination: {
    page: 1,
    size: 10,
    total: 0,
    totalPages: 0,
    hasNext: false,
    hasPrev: false,
  },
  filters: {
    search: '',
    audit_status: 'all',
  },
  sortBy: 'created_at',
  sortOrder: 'desc',
  selectedEnterprise: null,
  showDetailDialog: false,
  auditReason: '',
  actionLoading: false,
};


export default function EnterpriseAuditPage() {
  const [state, dispatch] = useReducer(auditReducer, initialState);
  const isFirstLoad = useRef(true);

  // 搜索字段配置
  const searchFields: SearchFieldConfig[] = [
    {
      key: 'search',
      label: '搜索',
      type: 'text',
      placeholder: '搜索企业名称、编码...',
    },
    {
      key: 'audit_status',
      label: '审核状态',
      type: 'select',
      defaultValue: 'all',
      options: [
        { value: 'all', label: '全部状态' },
        { value: '待审核', label: '待审核' },
        { value: '已通过', label: '已通过' },
        { value: '已驳回', label: '已驳回' },
      ],
    },
  ];

  // 表格列配置
  const columns: TableColumnConfig[] = [
    {
      key: 'name',
      label: '企业名称',
      sortable: false, // 禁用排序
      render: (value: string) => (
        <div className="font-medium text-foreground">{value}</div>
      ),
    },
    {
      key: 'code',
      label: '企业编码',
      sortable: false, // 禁用排序
      render: (value: string) => (
        <div className="font-mono text-sm text-muted-foreground">{value}</div>
      ),
    },
    {
      key: 'auditStatus',
      label: '审核状态',
      sortable: false, // 禁用排序
      render: (value: string) => {
        const statusConfig = {
          '待审核': { label: '待审核', variant: 'default' as const, className: 'bg-yellow-100 text-yellow-800 dark:bg-yellow-900 dark:text-yellow-200' },
          '已通过': { label: '已通过', variant: 'default' as const, className: 'bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-200' },
          '已驳回': { label: '已驳回', variant: 'default' as const, className: 'bg-red-100 text-red-800 dark:bg-red-900 dark:text-red-200' },
        };

        const config = statusConfig[value as keyof typeof statusConfig] || statusConfig['待审核'];
        return (
          <Badge className={`font-light ${config.className}`}>
            {config.label}
          </Badge>
        );
      },
    },
    {
      key: 'contactPerson',
      label: '联系人',
      sortable: false, // 禁用排序
    },
    {
      key: 'contactPhone',
      label: '联系电话',
      sortable: false, // 禁用排序
      render: (value: string) => (
        <div className="font-mono text-sm">{value || '-'}</div>
      ),
    },
    {
      key: 'createdAt',
      label: '创建时间',
      sortable: false, // 禁用排序
      render: (value: string) => (
        <div className="text-sm text-muted-foreground">
          {value ? new Date(value).toLocaleDateString('zh-CN') : '-'}
        </div>
      ),
    },
    {
      key: 'actions',
      label: '操作',
      sortable: false, // 操作列不能排序
      render: (_: any, row: Enterprise) => (
        <div className="flex gap-2">
          <Button
            size="sm"
            variant="outline"
            onClick={() => handleViewDetail(row)}
            className="h-8 px-2"
            title="查看"
          >
            <Eye className="w-3 h-3 mr-1" />
            查看
          </Button>
        </div>
      ),
    },
  ];

  // 加载企业数据 - 移除依赖项，通过参数传递状态
  const loadEnterprises = useCallback(async (params?: {
    filters?: Record<string, string>;
    pagination?: { page: number; size: number };
    sort?: { sortBy?: string; sortOrder: 'asc' | 'desc' };
    resetPage?: boolean;
  }) => {
    try {
      dispatch({ type: 'SET_LOADING', payload: true });

      const finalParams: TenantsQueryParams = {
        search: (params?.filters?.search ?? state.filters.search) || undefined,
        audit_status: params?.filters?.audit_status ?? state.filters.audit_status,
        page: params?.resetPage ? 1 : (params?.pagination?.page || state.pagination.page),
        size: params?.pagination?.size || state.pagination.size,
        order_by: params?.sort?.sortBy,
        sort_order: params?.sort?.sortOrder,
      };

      // 处理audit_status，如果为'all'则不传该参数
      if (finalParams.audit_status === 'all') {
        finalParams.audit_status = undefined;
      }

      const response = await fetchTenantsForAudit(finalParams);
      const transformedData = response.data.map(transformTenantData);

      dispatch({
        type: 'SET_ENTERPRISES',
        payload: {
          data: transformedData,
          pagination: {
            page: response.page,
            size: response.size,
            total: response.total,
            totalPages: response.total_pages,
            hasNext: response.has_next,
            hasPrev: response.has_prev,
          }
        }
      });
    } catch (error) {
      console.error('Failed to load enterprises for audit:', error);
      const errorMessage = error instanceof Error ? error.message : '加载企业审核数据失败';
      dispatch({ type: 'SET_ERROR', payload: errorMessage });
      toast.error(errorMessage);
    }
  }, []); // 移除所有依赖，使用参数传递状态变化

  // 首次加载数据 - 使用事件驱动，避免useEffect
  const initializeData = useCallback(() => {
    if (isFirstLoad.current) {
      isFirstLoad.current = false;
      loadEnterprises({ resetPage: true });
    }
  }, [loadEnterprises]);

  // 页面加载时初始化数据
  useEffect(() => {
    initializeData();
  }, []); // 只在组件挂载时执行一次

  // 计算统计数据
  const stats = useMemo(() => ({
    total: state.pagination.total,
    pending: state.enterprises.filter(e => e.auditStatus === '待审核').length,
    approved: state.enterprises.filter(e => e.auditStatus === '已通过').length,
    rejected: state.enterprises.filter(e => e.auditStatus === '已驳回').length,
  }), [state.enterprises, state.pagination.total]);

  // 事件处理器
  const handleSearch = useCallback((filters: Record<string, string>) => {
    dispatch({ type: 'SET_FILTERS', payload: filters });
    loadEnterprises({
      filters,
      pagination: { page: 1, size: state.pagination.size }
    });
  }, [loadEnterprises, state.pagination.size]);

  const handleSort = useCallback((sortBy: string, sortOrder: 'asc' | 'desc') => {
    dispatch({ type: 'SET_SORT', payload: { sortBy, sortOrder } });
    loadEnterprises({
      filters: state.filters,
      sort: { sortBy, sortOrder },
      resetPage: true
    });
  }, [loadEnterprises, state.filters]);

  const handlePageChange = useCallback((page: number) => {
    // 边界检查，确保页码在有效范围内
    if (page < 1) {
      page = 1;
    } else if (page > state.pagination.totalPages && state.pagination.totalPages > 0) {
      page = state.pagination.totalPages;
    }
    dispatch({ type: 'SET_PAGINATION', payload: { page } });
    loadEnterprises({
      filters: state.filters,
      pagination: { page, size: state.pagination.size }
    });
  }, [loadEnterprises, state.filters, state.pagination.size, state.pagination.totalPages]);

  const handleSizeChange = useCallback((size: number) => {
    dispatch({ type: 'SET_PAGINATION', payload: { size, page: 1 } });
    loadEnterprises({
      filters: state.filters,
      pagination: { page: 1, size }
    });
  }, [loadEnterprises, state.filters]);

  const handleRefresh = useCallback(() => {
    dispatch({ type: 'REFRESH_DATA' });
    loadEnterprises({ resetPage: true });
    toast.success('数据已刷新');
  }, [loadEnterprises]);

  const handleViewDetail = (enterprise: Enterprise) => {
    dispatch({ type: 'SET_SELECTED_ENTERPRISE', payload: enterprise });
    dispatch({ type: 'SET_AUDIT_REASON', payload: '' });
    dispatch({ type: 'TOGGLE_DETAIL_DIALOG', payload: true });
  };

  const handleAuditReasonChange = (value: string) => {
    dispatch({ type: 'SET_AUDIT_REASON', payload: value });
  };

  const handleApprove = async () => {
    if (!state.selectedEnterprise) return;

    try {
      dispatch({ type: 'SET_ACTION_LOADING', payload: true });

      const updatedTenant = await auditTenant(state.selectedEnterprise.id, {
        audit_status: '已通过',
        audit_comment: state.auditReason || '审核通过',
      });

      // 更新本地状态
      const updatedEnterprise = transformTenantData(updatedTenant);
      dispatch({
        type: 'SET_ENTERPRISES',
        payload: {
          data: state.enterprises.map(ent =>
            ent.id === state.selectedEnterprise?.id ? updatedEnterprise : ent
          ),
          pagination: state.pagination
        }
      });

      dispatch({ type: 'TOGGLE_DETAIL_DIALOG', payload: false });
      toast.success('审核通过');

      // 立即刷新列表，无需延迟
      loadEnterprises({ resetPage: true });
    } catch (error) {
      console.error('Approve failed:', error);
      const errorMessage = error instanceof Error ? error.message : '审核通过失败';
      toast.error(errorMessage);
    } finally {
      dispatch({ type: 'SET_ACTION_LOADING', payload: false });
    }
  };

  const handleReject = async () => {
    if (!state.selectedEnterprise) return;
    if (!state.auditReason.trim()) {
      toast.error('请填写驳回原因');
      return;
    }

    try {
      dispatch({ type: 'SET_ACTION_LOADING', payload: true });

      const updatedTenant = await auditTenant(state.selectedEnterprise.id, {
        audit_status: '已驳回',
        audit_comment: state.auditReason,
      });

      // 更新本地状态
      const updatedEnterprise = transformTenantData(updatedTenant);
      dispatch({
        type: 'SET_ENTERPRISES',
        payload: {
          data: state.enterprises.map(ent =>
            ent.id === state.selectedEnterprise?.id ? updatedEnterprise : ent
          ),
          pagination: state.pagination
        }
      });

      dispatch({ type: 'TOGGLE_DETAIL_DIALOG', payload: false });
      toast.success('已驳回');

      // 立即刷新列表，无需延迟
      loadEnterprises({ resetPage: true });
    } catch (error) {
      console.error('Reject failed:', error);
      const errorMessage = error instanceof Error ? error.message : '审核驳回失败';
      toast.error(errorMessage);
    } finally {
      dispatch({ type: 'SET_ACTION_LOADING', payload: false });
    }
  };

  return (
    <div className="space-y-6">
      {/* 页面标题和描述 */}
      <div>
        <h2 className="text-green-800">企业审核</h2>
        <p className="text-muted-foreground">管理企业注册与变更审核流程</p>
      </div>

      {/* 统计卡片 - 保留原有功能 */}
      <AuditStatsCards
        enterprises={state.enterprises}
        loading={state.loading}
      />

      {/* 搜索、表格和分页 - 使用重构后的组件 */}
      <SearchFormPagination
        formTitle="企业列表"
        formRightContent={
          <Button variant="outline" onClick={handleRefresh} disabled={state.loading}>
            <RefreshCw className={`w-4 h-4 mr-2 ${state.loading ? 'animate-spin' : ''}`} />
            刷新
          </Button>
        }
        searchFields={searchFields}
        columns={columns}
        data={state.enterprises}
        loading={state.loading}
        error={state.error}
        pagination={state.pagination}
        sortBy={state.sortBy}
        sortOrder={state.sortOrder}
        onPageChange={handlePageChange}
        onSizeChange={handleSizeChange}
        onSearch={handleSearch}
        onSort={handleSort}
        emptyIcon={<Building2 className="w-12 h-12" />}
        emptyText="暂无企业审核数据"
        showSizeSelector={true}
        showPageInfo={true}
        sizeOptions={[10, 20, 50, 100]}
      />

      {/* 企业详情对话框 - 保留原有功能 */}
      <EnterpriseDetailDialog
        open={state.showDetailDialog}
        onOpenChange={(open) => dispatch({ type: 'TOGGLE_DETAIL_DIALOG', payload: open })}
        enterprise={state.selectedEnterprise}
        auditReason={state.auditReason}
        onAuditReasonChange={handleAuditReasonChange}
        onApprove={handleApprove}
        onReject={handleReject}
        loading={state.actionLoading}
      />
    </div>
  );
}
