/**
 * 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
 */
'use client';

import { useReducer, useEffect, useMemo } from 'react';
import { toast } from 'sonner';
import { Building2, RefreshCw } from 'lucide-react';

import { fetchTenantsForAudit, auditTenant, transformTenantData, TenantsQueryParams, Enterprise } from './components/enterpriseAuditApi';
import { AuditStatsCards } from './components/AuditStatsCards';
import { AuditSearchAndFilter } from './components/AuditSearchAndFilter';
import { EnterpriseAuditTable } from './components/EnterpriseAuditTable';
import { EnterpriseDetailDialog } from './components/EnterpriseDetailDialog';
import { AuditPagination } from './components/AuditPagination';

// 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);

  // 加载企业数据
  const loadEnterprises = async (resetPage = false) => {
    try {
      dispatch({ type: 'SET_LOADING', payload: true });

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

      const response = await fetchTenantsForAudit(params);
      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);
    }
  };

  // 初始加载
  useEffect(() => {
    loadEnterprises(true);
  }, [state.filters.search, state.filters.audit_status, state.sortBy, state.sortOrder]);

  // 分页加载
  useEffect(() => {
    if (state.pagination.page > 1) {
      loadEnterprises(false);
    }
  }, [state.pagination.page]);

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

  // 事件处理器
  const handleSearch = (value: string) => {
    dispatch({ type: 'SET_FILTERS', payload: { search: value } });
  };

  const handleAuditStatusFilter = (value: string) => {
    dispatch({ type: 'SET_FILTERS', payload: { audit_status: value === 'all' ? 'all' : value } });
  };

  const handleSort = (sortBy?: string) => {
    const newSortOrder = state.sortBy === sortBy && state.sortOrder === 'desc' ? 'asc' : 'desc';
    dispatch({ type: 'SET_SORT', payload: { sortBy, sortOrder: newSortOrder } });
  };

  const handlePageChange = (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 } });
  };

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

  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');

      // 1秒后刷新列表
      setTimeout(() => {
        loadEnterprises(true);
      }, 1000);
    } 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');

      // 1秒后刷新列表
      setTimeout(() => {
        loadEnterprises(true);
      }, 1000);
    } 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 */}
      <AuditStatsCards
        enterprises={state.enterprises}
        loading={state.loading}
      />

      {/* 搜索和筛选 */}
      <AuditSearchAndFilter
        searchKeyword={state.filters.search}
        onSearchChange={(value) => dispatch({ type: 'SET_FILTERS', payload: { search: value } })}
        statusFilter={state.filters.audit_status}
        onStatusFilterChange={(value) => dispatch({ type: 'SET_FILTERS', payload: { audit_status: value } })}
        onRefresh={handleRefresh}
        loading={state.loading}
      />

      {/* 企业列表 */}
      <EnterpriseAuditTable
        enterprises={state.enterprises}
        loading={state.loading}
        onViewDetails={handleViewDetail}
      />

      {/* 分页 */}
      {state.pagination.total > 0 && (
        <AuditPagination
          pagination={state.pagination}
          onPageChange={handlePageChange}
          loading={state.loading}
        />
      )}

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