// app/components/admin/menu/MenusTable.tsx
'use client';

import { useState, useEffect, useCallback } from 'react';
import Link from 'next/link';
import { useRouter } from 'next/navigation';
import toast from 'react-hot-toast';
import { usePermissions } from '@/hooks/usePermissions';
import { PERMISSIONS } from '@/lib/permissions';
import { useAlert } from '@/contexts/AlertContext';
import DataTable from '@/app/components/admin/CommonComponents/DataTable';
import TablePagination from '@/app/components/admin/CommonComponents/TablePagination';
import TableFilters from '@/app/components/admin/CommonComponents/TableFilters';
import { BaseTableItem, FilterConfig, FilterValues, PaginationData, TableColumn, TableAction } from '@/types/admin-table';

interface Menu extends BaseTableItem {
  id: string;
  name: string;
  position: string;
  total_items: number;
  created_at: string;
  updated_at: string;
}

interface MenusTableProps {
  initialData?: {
    menus: Menu[];
    pagination: PaginationData;
  };
}

const POSITION_LABELS: Record<string, string> = {
  top_header: 'Top Header',
  header: 'Header',
  footer_menu_1: 'Footer Menu 1',
  footer_menu_2: 'Footer Menu 2',
  footer_menu_3: 'Footer Menu 3',
};

const POSITION_COLORS: Record<string, string> = {
  top_header: 'bg-var-warning-bg text-var-warning-text',
  header: 'bg-var-primary-muted text-var-primary-text',
  footer_menu_1: 'bg-var-success-bg text-var-success-text',
  footer_menu_2: 'bg-var-info-bg text-var-info-text',
};

export default function MenusTable({ initialData }: MenusTableProps) {
  const router = useRouter();
  const [menus, setMenus] = useState<Menu[]>(initialData?.menus || []);
  const [loading, setLoading] = useState(false);
  const [filtersVisible, setFiltersVisible] = useState(false);
  const [pagination, setPagination] = useState<PaginationData>(
    initialData?.pagination || { page: 1, limit: 10, total: 0, pages: 0 }
  );
  const [filters, setFilters] = useState<FilterValues>({ 
    search: '', 
    position: '' 
  });

  const { hasPermission } = usePermissions();
  const { showAlert } = useAlert();

  const canCreate = hasPermission(PERMISSIONS.MENUS_CREATE);
  const canEdit = hasPermission(PERMISSIONS.MENUS_UPDATE);
  const canDelete = hasPermission(PERMISSIONS.MENUS_DELETE);
  const canBulkDelete = hasPermission(PERMISSIONS.MENUS_BULK_DELETE);

  // Filter configuration
  const filterConfigs: FilterConfig[] = [
    {
      key: 'search',
      label: 'Search',
      type: 'search',
      placeholder: 'Search by name...'
    },
    {
      key: 'position',
      label: 'Position',
      type: 'select',
      options: Object.entries(POSITION_LABELS).map(([value, label]) => ({
        value,
        label
      }))
    }
  ];

  const fetchMenus = useCallback(
    async (page = 1, newFilters = filters) => {
      setLoading(true);
      try {
        const params = new URLSearchParams({
          page: page.toString(),
          limit: pagination.limit.toString(),
          ...newFilters,
        });
        const res = await fetch(`/api/backend/admin/menus?${params}`);
        const data = await res.json();
        if (res.ok) {
          setMenus(data.menus);
          setPagination(data.pagination);
        } else {
          toast.error(data.error || 'Failed to fetch menus');
        }
      } catch {
        toast.error('Failed to fetch menus');
      } finally {
        setLoading(false);
      }
    },
    [filters, pagination.limit]
  );

  const handleFilterChange = (newFilters: FilterValues) => {
    setFilters(newFilters);
    fetchMenus(1, newFilters);
  };

  const handlePageChange = (page: number) => {
    fetchMenus(page);
  };

  const handleDeleteClick = (menu: Menu) => {
    if (!canDelete) {
      toast.error('You do not have permission to delete menus');
      return;
    }
    
    showAlert({
      title: 'Delete Menu',
      message: `Are you sure you want to delete "${menu.name}"? All menu items (${menu.total_items}) will be permanently removed.`,
      confirmText: 'Delete Menu',
      cancelText: 'Cancel',
      onConfirm: () => deleteMenu(menu.id),
    });
  };

  const deleteMenu = async (menuId: string) => {
    try {
      const res = await fetch(`/api/backend/admin/menus/${menuId}`, { 
        method: 'DELETE' 
      });
      const data = await res.json();
      if (res.ok) {
        toast.success(data.message || 'Menu deleted successfully');
        fetchMenus(pagination.page);
      } else {
        toast.error(data.error || 'Failed to delete menu');
      }
    } catch {
      toast.error('Failed to delete menu');
    }
  };

  // Handle bulk delete
  const handleBulkDelete = async (selectedIds: string[]) => {
    try {
      const response = await fetch('/api/backend/admin/menus/bulk-delete', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ ids: selectedIds }),
      });

      const data = await response.json();

      if (response.ok) {
        if (data.notFoundIds && data.notFoundIds.length > 0) {
          toast.success(
            `${data.deletedCount} menu${data.deletedCount !== 1 ? 's' : ''} deleted (${data.totalItemsDeleted} total items), ${data.notFoundIds.length} not found`
          );
        } else if (data.deletedCount === 1) {
          toast.success(data.message);
        } else {
          toast.success(data.message);
        }
        
        fetchMenus(pagination.page);
      } else {
        toast.error(data.error || 'Bulk delete failed');
      }
    } catch {
      toast.error('Bulk delete failed');
    }
  };

  // Bulk actions configuration
  const bulkActions = [
    ...(canBulkDelete ? [{
      key: 'bulk-delete',
      label: 'Delete selected',
      icon: (
        <svg fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
            d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
        </svg>
      ),
      className: 'bg-var-danger-bg text-var-danger hover:bg-var-danger-bg',
      requiresConfirm: true,
      confirmTitle: 'Delete selected menus',
      confirmMessage: (count: number) => {
        return `Are you sure you want to delete ${count} menu${count !== 1 ? 's' : ''}? This will also delete menu items. This action cannot be undone.`;
      },
      onClick: handleBulkDelete,
    }] : []),
  ];

  // Table columns configuration
  const columns: TableColumn<Menu>[] = [
    {
      key: 'name',
      label: 'Menu Name',
      render: (menu) => (
        <div className="flex items-center gap-3">
          <div className="w-8 h-8 bg-var-primary rounded-lg flex items-center justify-center shrink-0">
            <svg className="w-4 h-4 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h7" />
            </svg>
          </div>
          <div>
            <p className="text-sm font-medium text-var-text">{menu.name}</p>
            <p className="text-xs text-var-text-muted font-mono">{menu.id}</p>
          </div>
        </div>
      )
    },
    {
      key: 'position',
      label: 'Position',
      render: (menu) => (
        <span className={`inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${POSITION_COLORS[menu.position] || 'bg-var-surface-hover text-var-text-muted'}`}>
          {POSITION_LABELS[menu.position] || menu.position}
        </span>
      )
    },
    {
      key: 'items',
      label: 'Items',
      render: (menu) => (
        <span className="text-sm text-var-text">
          {menu.total_items} item{menu.total_items !== 1 ? 's' : ''}
        </span>
      )
    },
    {
      key: 'updated_at',
      label: 'Last Updated',
      render: (menu) => (
        <span className="text-sm text-var-text-muted">
          {new Date(menu.updated_at).toLocaleDateString()}
        </span>
      )
    }
  ];

  // Table actions configuration
  const actions: TableAction<Menu>[] = [
    // Edit button
    ...(canEdit ? [{
      key: 'edit',
      icon: (
        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" />
        </svg>
      ),
      onClick: (menu: Menu) => {
        router.push(`/admin/dashboard/menus/edit/${menu.id}`);
      },
      className: 'text-var-primary hover:text-var-primary-hover hover:bg-var-primary-muted',
      title: 'Edit menu'
    }] : []),

    // Delete button
    ...(canDelete ? [{
      key: 'delete',
      icon: (
        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
        </svg>
      ),
      onClick: (menu: Menu) => handleDeleteClick(menu),
      className: 'text-var-danger hover:text-var-danger-text hover:bg-var-danger-bg',
      title: 'Delete menu'
    }] : [])
  ];

  useEffect(() => {
    if (!initialData) fetchMenus();
  }, [fetchMenus, initialData]);

  const toggleFilters = () => {
    setFiltersVisible(!filtersVisible);
  };

  return (
    <div className="bg-var-surface rounded-2xl shadow-var-card border border-var-border overflow-hidden">
      {/* Header */}
      <div className="px-6 py-4 border-b border-var-border bg-var-surface-hover/50">
        <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between gap-4">
          <div>
            <h2 className="text-lg font-semibold text-var-text">Menu Management</h2>
            <p className="text-sm text-var-text-secondary mt-1">
              {pagination.total} menu{pagination.total !== 1 ? 's' : ''} found
            </p>
          </div>
          
          <div className="flex items-center gap-3">
            {/* Filter Toggle Button */}
            <button
              onClick={toggleFilters}
              className="inline-flex items-center px-3 py-2 bg-var-surface border border-var-border text-var-text-secondary font-medium rounded-xl hover:bg-var-surface-hover hover:text-var-text transition-all duration-200 shadow-var-button"
              title={filtersVisible ? "Hide filters" : "Show filters"}
            >
              <svg className="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 4a1 1 0 011-1h16a1 1 0 011 1v2.586a1 1 0 01-.293.707l-6.414 6.414a1 1 0 00-.293.707V17l-4 4v-6.586a1 1 0 00-.293-.707L3.293 7.293A1 1 0 013 6.586V4z" />
              </svg>
              {filtersVisible ? 'Hide Filters' : 'Show Filters'}
            </button>

            {canCreate && (
              <Link
                href="/admin/dashboard/menus/new"
                className="inline-flex items-center px-4 py-2 bg-var-primary text-white font-medium rounded-xl hover:opacity-90 transition-all duration-200 shadow-var-button"
              >
                <svg className="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
                </svg>
                Add Menu
              </Link>
            )}
          </div>
        </div>

        {/* Filters - Conditionally rendered */}
        {filtersVisible && (
          <div className="mt-4">
            <TableFilters
              filters={filterConfigs}
              onFilterChange={handleFilterChange}
              initialValues={filters}
              className="mt-0"
            />
          </div>
        )}
      </div>

      {/* Table */}
      <DataTable
        data={menus}
        columns={columns}
        actions={actions}
        bulkActions={bulkActions}
        loading={loading}
        emptyMessage="No menus found"
        emptyDescription="Try adjusting your search or filters"
        onCreateNew={canCreate ? () => {
          router.push('/admin/dashboard/menus/new');
        } : undefined}
        createNewLabel="Create your first menu →"
        keyExtractor={(menu) => menu.id}
      />

      {/* Pagination */}
      <TablePagination
        pagination={pagination}
        onPageChange={handlePageChange}
      />
    </div>
  );
}