import React, { useState } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { TrashIcon, PencilIcon, MagnifyingGlassIcon } from '@heroicons/react/24/outline';
import { toast } from 'sonner';
import { api } from '../lib/api';
import type { ApiResponse, PaginatedResponse } from '../lib/api';
import type { Secretary, SecretaryPermissions } from '../types';
import { formatDate, maskMobile } from '../lib/utils';
import DataTable, { Column } from '../components/ui/DataTable';
import { ActiveBadge } from '../components/ui/StatusBadge';
import Pagination from '../components/ui/Pagination';
import ConfirmDialog from '../components/ui/ConfirmDialog';
import Modal from '../components/ui/Modal';

const DEFAULT_PERMISSIONS: SecretaryPermissions = {
  appointments: { view: true, create: false, cancel: false, update_status: false },
  addresses: { view: true, create: false, update: false, delete: false },
  clinic_info: { view: true, update: false },
  insurances: { view: true, create: false, update: false, delete: false },
};

type PermSection = keyof SecretaryPermissions;

const PERMISSION_LABELS: Record<PermSection, { label: string; actions: { key: string; label: string }[] }> = {
  appointments: {
    label: 'نوبت‌ها',
    actions: [
      { key: 'view', label: 'مشاهده' },
      { key: 'create', label: 'ایجاد' },
      { key: 'cancel', label: 'لغو' },
      { key: 'update_status', label: 'تغییر وضعیت' },
    ],
  },
  addresses: {
    label: 'آدرس‌ها',
    actions: [
      { key: 'view', label: 'مشاهده' },
      { key: 'create', label: 'ایجاد' },
      { key: 'update', label: 'ویرایش' },
      { key: 'delete', label: 'حذف' },
    ],
  },
  clinic_info: {
    label: 'اطلاعات کلینیک',
    actions: [
      { key: 'view', label: 'مشاهده' },
      { key: 'update', label: 'ویرایش' },
    ],
  },
  insurances: {
    label: 'بیمه‌ها',
    actions: [
      { key: 'view', label: 'مشاهده' },
      { key: 'create', label: 'ایجاد' },
      { key: 'update', label: 'ویرایش' },
      { key: 'delete', label: 'حذف' },
    ],
  },
};

function PermissionsMatrix({
  permissions,
  onChange,
}: {
  permissions: SecretaryPermissions;
  onChange: (p: SecretaryPermissions) => void;
}) {
  const toggle = (section: PermSection, action: string) => {
    const current = (permissions[section] as Record<string, boolean>)[action];
    onChange({
      ...permissions,
      [section]: { ...(permissions[section] as Record<string, boolean>), [action]: !current },
    });
  };

  const allActions = ['view', 'create', 'update', 'delete', 'cancel', 'update_status'];
  const actionHeaders = ['مشاهده', 'ایجاد', 'ویرایش', 'حذف', 'لغو', 'تغییر وضعیت'];

  return (
    <div style={{ overflowX: 'auto' }}>
      <table className="t">
        <thead>
          <tr>
            <th>بخش</th>
            {actionHeaders.map((h) => (
              <th key={h} style={{ textAlign: 'center', fontSize: 12 }}>{h}</th>
            ))}
          </tr>
        </thead>
        <tbody>
          {(Object.keys(PERMISSION_LABELS) as PermSection[]).map((section) => {
            const config = PERMISSION_LABELS[section];
            const sectionPerms = permissions[section] as Record<string, boolean>;
            return (
              <tr key={section}>
                <td><b>{config.label}</b></td>
                {allActions.map((action) => {
                  const actionConfig = config.actions.find((a) => a.key === action);
                  if (!actionConfig) {
                    return <td key={action} style={{ textAlign: 'center', color: 'var(--border)' }}>—</td>;
                  }
                  return (
                    <td key={action} style={{ textAlign: 'center' }}>
                      <input
                        type="checkbox"
                        checked={sectionPerms[action] ?? false}
                        onChange={() => toggle(section, action)}
                        style={{ width: 16, height: 16, accentColor: 'var(--primary)', cursor: 'pointer' }}
                      />
                    </td>
                  );
                })}
              </tr>
            );
          })}
        </tbody>
      </table>
    </div>
  );
}

export default function SecretariesPage() {
  const qc = useQueryClient();
  const [page, setPage] = useState(1);
  const [search, setSearch] = useState('');
  const [editTarget, setEditTarget] = useState<Secretary | null>(null);
  const [editPerms, setEditPerms] = useState<SecretaryPermissions>(DEFAULT_PERMISSIONS);
  const [deleteTarget, setDeleteTarget] = useState<Secretary | null>(null);
  const limit = 15;

  const { data, isLoading } = useQuery({
    queryKey: ['secretaries', page, search],
    queryFn: () => {
      const params = new URLSearchParams({ page: String(page), limit: String(limit) });
      if (search) params.set('search', search);
      return api.get<PaginatedResponse<Secretary>>(`/api/v1/admin/secretaries?${params}`);
    },
  });

  const updatePermsMutation = useMutation({
    mutationFn: ({ uuid, permissions }: { uuid: string; permissions: SecretaryPermissions }) =>
      api.patch<ApiResponse<null>>(`/api/v1/secretary/${uuid}`, { permissions }),
    onSuccess: () => {
      toast.success('دسترسی‌ها بروزرسانی شد');
      setEditTarget(null);
      qc.invalidateQueries({ queryKey: ['secretaries'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  const deleteMutation = useMutation({
    mutationFn: (s: Secretary) => api.delete<ApiResponse<null>>(`/api/v1/secretary/${s.uuid}`),
    onSuccess: () => {
      toast.success('منشی حذف شد');
      setDeleteTarget(null);
      qc.invalidateQueries({ queryKey: ['secretaries'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  const openEdit = (s: Secretary) => {
    setEditTarget(s);
    setEditPerms(s.permissions ?? DEFAULT_PERMISSIONS);
  };

  const columns: Column<Secretary>[] = [
    { key: 'user_name', header: 'نام', render: (s) => <b>{s.user_name}</b> },
    { key: 'mobile_number', header: 'موبایل', render: (s) => <span dir="ltr">{maskMobile(s.mobile_number)}</span> },
    { key: 'doctor_name', header: 'پزشک', render: (s) => `دکتر ${s.doctor_name}` },
    { key: 'is_active', header: 'وضعیت', render: (s) => <ActiveBadge active={s.is_active} /> },
    { key: 'created_at', header: 'تاریخ ثبت', render: (s) => formatDate(s.created_at) },
  ];

  const items = data?.data ?? [];
  const total = data?.meta?.totalRecords ?? 0;

  return (
    <div className="fade-in">
      <div className="card-title-row" style={{ marginBottom: 'var(--gap)' }}>
        <div>
          <h1 className="section-title">منشی‌ها</h1>
          <div className="muted">{total} منشی ثبت‌شده</div>
        </div>
      </div>

      <div className="card">
        <div className="card-pad" style={{ paddingBottom: 0 }}>
          <div className="toolbar">
            <div className="field" style={{ minWidth: 240 }}>
              <MagnifyingGlassIcon style={{ width: 17, height: 17 }} />
              <input
                value={search}
                onChange={(e) => { setSearch(e.target.value); setPage(1); }}
                placeholder="جستجو بر اساس نام یا پزشک..."
              />
            </div>
          </div>
        </div>
        <DataTable<Secretary>
          columns={columns}
          data={items}
          loading={isLoading}
          emptyMessage="هیچ منشی‌ای یافت نشد"
          actions={(sec) => (
            <>
              <button onClick={() => openEdit(sec)} className="mini-btn" title="ویرایش دسترسی‌ها">
                <PencilIcon style={{ width: 15, height: 15 }} />
              </button>
              <button onClick={() => setDeleteTarget(sec)} className="mini-btn danger" title="حذف">
                <TrashIcon style={{ width: 15, height: 15 }} />
              </button>
            </>
          )}
        />
        <Pagination page={page} total={total} limit={limit} onPageChange={setPage} />
      </div>

      <Modal
        open={!!editTarget}
        title={`دسترسی‌های ${editTarget?.user_name}`}
        size="lg"
        onClose={() => setEditTarget(null)}
        footer={
          <>
            <button onClick={() => setEditTarget(null)} className="btn ghost sm">لغو</button>
            <button
              onClick={() => editTarget && updatePermsMutation.mutate({ uuid: editTarget.uuid, permissions: editPerms })}
              disabled={updatePermsMutation.isPending}
              className="btn primary sm">
              {updatePermsMutation.isPending ? 'در حال ذخیره...' : 'ذخیره دسترسی‌ها'}
            </button>
          </>
        }
      >
        <PermissionsMatrix permissions={editPerms} onChange={setEditPerms} />
      </Modal>

      <ConfirmDialog
        open={!!deleteTarget}
        title="حذف منشی"
        message={`آیا از حذف منشی "${deleteTarget?.user_name}" اطمینان دارید؟`}
        confirmLabel="حذف"
        danger
        loading={deleteMutation.isPending}
        onConfirm={() => deleteTarget && deleteMutation.mutate(deleteTarget)}
        onCancel={() => setDeleteTarget(null)}
      />
    </div>
  );
}
