import React, { useState } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { useNavigate } from 'react-router-dom';
import { EyeIcon, NoSymbolIcon, PlusIcon, MagnifyingGlassIcon } from '@heroicons/react/24/outline';
import { useForm, Controller } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { toast } from 'sonner';
import { api } from '../lib/api';
import type { ApiResponse, PaginatedResponse } from '../lib/api';
import MobileInput from '../components/ui/MobileInput';
import { iranMobileSchema } from '../lib/utils';
import type { Representation, City } from '../types';
import { formatDate, formatRial, formatNumber } 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';
import SearchableSelect from '../components/ui/SearchableSelect';
import { numericField } from '../lib/forms';

const schema = z.object({
  full_name:          z.string().min(2, 'نام الزامی است'),
  mobile_number:      iranMobileSchema,
  city_ids:           z.array(z.number()).optional(),
  domain:             z.string().optional(),
  is_global:          z.boolean().optional(),
  commission_percent: z.coerce.number().min(0).max(100),
});
type FormData = z.infer<typeof schema>;

export default function RepresentationsPage() {
  const navigate = useNavigate();
  const qc = useQueryClient();
  const [page, setPage] = useState(1);
  const [search, setSearch] = useState('');
  const [cityFilter, setCityFilter] = useState<number | null>(null);
  const [addOpen, setAddOpen] = useState(false);
  const [deleteTarget, setDeleteTarget] = useState<Representation | null>(null);
  const limit = 15;

  const citiesQuery = useQuery({
    queryKey: ['cities-select'],
    queryFn: () => api.get<PaginatedResponse<City>>('/api/v1/admin/cities?limit=200'),
    staleTime: 5 * 60_000,
  });
  const cities: City[] = citiesQuery.data?.data ?? [];
  const cityOptions = cities.map((c) => ({ value: c.id, label: c.name }));

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

  const { register, handleSubmit, reset, control, watch, formState: { errors, isSubmitting } } = useForm<FormData>({
    resolver: zodResolver(schema),
    defaultValues: { commission_percent: 10, city_ids: [], is_global: false },
  });
  const isGlobal = watch('is_global') ?? false;

  const createMutation = useMutation({
    mutationFn: (d: FormData) =>
      api.post<ApiResponse<Representation>>('/api/v1/representation', {
        full_name: d.full_name,
        mobile_number: d.mobile_number,
        city_ids: d.city_ids ?? [],
        is_global: d.is_global ?? false,
        ...(d.domain?.trim() && { domain: d.domain.trim() }),
        commission_percent: d.commission_percent,
      }),
    onSuccess: () => {
      toast.success('نماینده اضافه شد');
      setAddOpen(false);
      reset();
      qc.invalidateQueries({ queryKey: ['representations'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  const deactivateMutation = useMutation({
    mutationFn: (r: Representation) =>
      api.patch<ApiResponse<Representation>>(`/api/v1/representation/${r.uuid}`, { active: false }),
    onSuccess: () => {
      toast.success('نماینده غیرفعال شد');
      setDeleteTarget(null);
      qc.invalidateQueries({ queryKey: ['representations'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  const columns: Column<Representation>[] = [
    { key: 'full_name', header: 'نام', render: (r) => (
      <span style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
        <b>{r.full_name}</b>
        {r.is_global && <span className="badge green" title="نماینده سراسری">سراسری ✓</span>}
      </span>
    ) },
    { key: 'mobile_number', header: 'موبایل', render: (r) => <span dir="ltr">{r.mobile_number ?? '—'}</span> },
    { key: 'domain', header: 'دامنه', render: (r) => r.domain ? <span dir="ltr">{r.domain}</span> : '—' },
    { key: 'city', header: 'شهرها', render: (r) => r.city ?? '—' },
    { key: 'commission_percent', header: 'کمیسیون', render: (r) => `${formatNumber(r.commission_percent)}٪` },
    { key: 'doctor_count', header: 'تعداد پزشکان', render: (r) => formatNumber(r.doctor_count ?? 0) },
    { key: 'appointment_count', header: 'تعداد نوبت', render: (r) => formatNumber(r.appointment_count ?? 0) },
    { key: 'wallet_balance', header: 'موجودی کیف‌پول', render: (r) => formatRial(r.wallet_balance ?? 0) },
    { key: 'is_active', header: 'وضعیت', render: (r) => <ActiveBadge active={r.is_active ?? r.active ?? false} /> },
    { key: 'created_at', header: 'تاریخ ثبت', render: (r) => formatDate(r.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">نمایندگان</h1>
          <div className="muted">{total} نماینده ثبت‌شده</div>
        </div>
        <button onClick={() => setAddOpen(true)} className="btn primary sm">
          <PlusIcon style={{ width: 16, height: 16 }} />
          افزودن نماینده
        </button>
      </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 موبایل..."
              />
            </div>
            <div style={{ minWidth: 200 }}>
              <SearchableSelect
                options={cityOptions}
                value={cityFilter}
                onChange={(val) => { setCityFilter(val as number | null); setPage(1); }}
                placeholder="فیلتر شهر..."
                isClearable
                isLoading={citiesQuery.isLoading}
                noOptionsMessage="هیچ شهری یافت نشد"
              />
            </div>
          </div>
        </div>
        <DataTable<Representation>
          columns={columns}
          data={items}
          loading={isLoading}
          emptyMessage="هیچ نماینده‌ای یافت نشد"
          actions={(rep) => (
            <>
              <button onClick={() => navigate(`/admin/representations/${rep.uuid}`)}
                className="mini-btn" title="مشاهده">
                <EyeIcon style={{ width: 15, height: 15 }} />
              </button>
              {(rep.is_active ?? rep.active) && (
                <button onClick={() => setDeleteTarget(rep)}
                  className="mini-btn danger" title="غیرفعال‌سازی">
                  <NoSymbolIcon style={{ width: 15, height: 15 }} />
                </button>
              )}
            </>
          )}
        />
        <Pagination page={page} total={total} limit={limit} onPageChange={setPage} />
      </div>

      <Modal open={addOpen} title="افزودن نماینده" onClose={() => { setAddOpen(false); reset(); }}
        footer={
          <>
            <button onClick={() => { setAddOpen(false); reset(); }} className="btn ghost sm">لغو</button>
            <button form="add-rep-form" type="submit" disabled={isSubmitting} className="btn primary sm">
              {isSubmitting ? 'در حال ذخیره...' : 'ذخیره'}
            </button>
          </>
        }
      >
        <form id="add-rep-form" onSubmit={handleSubmit((d) => createMutation.mutate(d))}>
          <div className="form-row">
            <label>نام کامل</label>
            <input {...register('full_name')} placeholder="علی محمدی" className="input" />
            {errors.full_name && <p className="err-text">{errors.full_name.message}</p>}
          </div>
          <div className="form-row" style={{ marginTop: 12 }}>
            <label>شماره موبایل</label>
            <MobileInput className="input" hasError={!!errors.mobile_number} {...register('mobile_number')} />
            {errors.mobile_number && <p className="err-text">{errors.mobile_number.message}</p>}
          </div>
          <div className="form-row" style={{ marginTop: 12 }}>
            <label style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
              <input type="checkbox" {...register('is_global')} style={{ width: 16, height: 16 }} />
              نماینده سراسری (دامنه اختصاصی — فقط پزشکان/کلینیک‌های خودش نمایش داده می‌شوند)
            </label>
          </div>
          <div className="form-row" style={{ marginTop: 12 }}>
            <label>دامنه</label>
            <input {...register('domain')} placeholder="example-nobat.ir" dir="ltr" className="input" />
            {errors.domain && <p className="err-text">{errors.domain.message}</p>}
          </div>
          <div className="form-row" style={{ marginTop: 12 }}>
            <label>شهرها {isGlobal && <span className="muted">(برای نماینده سراسری اختیاری)</span>}</label>
            <Controller
              name="city_ids"
              control={control}
              render={({ field }) => {
                const selected: number[] = field.value ?? [];
                return (
                  <div>
                    <SearchableSelect
                      options={cityOptions.filter((o) => !selected.includes(o.value))}
                      value={null}
                      onChange={(val) => {
                        if (val !== null && !selected.includes(val as number)) {
                          field.onChange([...selected, val as number]);
                        }
                      }}
                      placeholder={isGlobal ? 'اختیاری — افزودن شهر...' : 'افزودن شهر...'}
                      isClearable
                      isLoading={citiesQuery.isLoading}
                      noOptionsMessage="هیچ شهری یافت نشد"
                    />
                    {selected.length > 0 && (
                      <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginTop: 8 }}>
                        {selected.map((id) => (
                          <span key={id} className="badge" style={{ display: 'inline-flex', alignItems: 'center', gap: 4 }}>
                            {cityOptions.find((o) => o.value === id)?.label ?? id}
                            <button type="button" className="mini-btn" style={{ padding: 0, width: 16, height: 16 }}
                              onClick={() => field.onChange(selected.filter((v) => v !== id))}>
                              ×
                            </button>
                          </span>
                        ))}
                      </div>
                    )}
                  </div>
                );
              }}
            />
          </div>
          <div className="form-row" style={{ marginTop: 12 }}>
            <label>درصد کمیسیون</label>
            <input {...numericField(register('commission_percent'), 3)} placeholder="10" dir="ltr"
              className="input" />
            {errors.commission_percent && <p className="err-text">{errors.commission_percent.message}</p>}
          </div>
        </form>
      </Modal>

      <ConfirmDialog
        open={!!deleteTarget}
        title="غیرفعال‌سازی نماینده"
        message={`آیا از غیرفعال‌سازی نماینده "${deleteTarget?.full_name}" اطمینان دارید؟ این نماینده دیگر فعال نخواهد بود.`}
        confirmLabel="غیرفعال‌سازی"
        danger
        loading={deactivateMutation.isPending}
        onConfirm={() => deleteTarget && deactivateMutation.mutate(deleteTarget)}
        onCancel={() => setDeleteTarget(null)}
      />
    </div>
  );
}