import { useNavigate, useSearchParams } from 'react-router-dom';
import { ArrowPathIcon } from '@heroicons/react/24/outline';
import PageHeader from '../components/ui/PageHeader';
import Pagination from '../components/ui/Pagination';
import PersianDatePicker from '../components/ui/PersianDatePicker';
import SearchableSelect from '../components/ui/SearchableSelect';
import StatCard from '../components/ui/StatCard';
import StatusBadge from '../components/ui/StatusBadge';
import DataTable, { type Column } from '../components/ui/DataTable';
import { formatRial, formatDate, formatNumber, toDate } from '../lib/utils';
import {
  usePayments,
  usePaymentsSummary,
  MY_PAYMENTS_LIMIT,
  type PaymentRow,
} from '../hooks/useMyPayments';

const STATUS_OPTIONS = [
  { value: '', label: 'همه وضعیت‌ها' },
  { value: 'paid', label: 'پرداخت شده' },
  { value: 'partial', label: 'پرداخت ناقص' },
  { value: 'unsettled', label: 'تسویه نشده' },
];

const isoNDaysAgo = (days: number): string => {
  const d = new Date();
  d.setDate(d.getDate() - days);
  return d.toISOString().slice(0, 10);
};
const todayIso = (): string => new Date().toISOString().slice(0, 10);

/** HH:MM (Persian digits) from a unix timestamp. */
function formatTime(unix: number): string {
  return new Intl.DateTimeFormat('fa-IR', { hour: '2-digit', minute: '2-digit' }).format(new Date(unix * 1000));
}

/** unix start-of-day for `from`, end-of-day for `to`, from a gregorian Y-m-d. */
function dayBound(value: string, end: boolean): number | undefined {
  const d = toDate(value);
  if (!d) return undefined;
  const secs = Math.floor(d.setHours(0, 0, 0, 0) / 1000);
  return end ? secs + 86399 : secs;
}

function Avatar({ name }: { name: string | null }) {
  return (
    <div style={{
      width: 32, height: 32, borderRadius: '50%', flexShrink: 0,
      background: 'linear-gradient(145deg, var(--primary), var(--primary-700, var(--primary)))',
      display: 'grid', placeItems: 'center', color: 'var(--on-primary)', fontSize: 13, fontWeight: 700,
    }}>
      {(name ?? '؟').charAt(0)}
    </div>
  );
}

/**
 * لیست پرداخت‌ها — فهرست تخت صورتحساب‌های ثبت‌شده‌ی tenant.
 * فیلترها در query string زندگی می‌کنند تا رفرش و اشتراک لینک، نما را حفظ کند.
 */
export default function MyPaymentsPage() {
  const navigate = useNavigate();
  const [params, setParams] = useSearchParams();

  const search = params.get('search') ?? '';
  const status = params.get('status') ?? '';
  const from = params.get('from') ?? '';
  const to = params.get('to') ?? '';
  const page = Math.max(1, Number(params.get('page') ?? 1));

  const hasFilters = !!(search || status || from || to);

  /** تغییر فیلتر همیشه به صفحه‌ی اول برمی‌گردد؛ ماندن روی صفحه ۵ با نتیجه‌ی جدید بی‌معناست. */
  const setParam = (patch: Record<string, string>) => {
    const next = new URLSearchParams(params);
    Object.entries(patch).forEach(([k, v]) => (v ? next.set(k, v) : next.delete(k)));
    if (!('page' in patch)) next.delete('page');
    setParams(next, { replace: true });
  };

  const filters = {
    national_code: search || undefined,
    status: status || undefined,
    from: from ? dayBound(from, false) : undefined,
    to: to ? dayBound(to, true) : undefined,
  };

  const listQuery = usePayments({ page, ...filters });
  const summaryQuery = usePaymentsSummary(filters);

  const rows = listQuery.data?.data ?? [];
  const total = listQuery.data?.meta?.totalRecords ?? 0;
  const summary = summaryQuery.data?.data;

  const columns: Column<PaymentRow>[] = [
    {
      key: 'patient_name',
      header: 'بیمار',
      render: (r) => (
        <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
          <Avatar name={r.patient_name} />
          <span style={{ fontWeight: 600 }}>{r.patient_name ?? '—'}</span>
        </div>
      ),
    },
    { key: 'national_code', header: 'کد ملی', render: (r) => <span dir="ltr">{r.national_code ?? '—'}</span> },
    {
      key: 'issued_at',
      header: 'تاریخ',
      render: (r) => <span dir="ltr">{formatDate(r.issued_at)} - {formatTime(r.issued_at)}</span>,
    },
    {
      key: 'amount_rials',
      header: 'مبلغ',
      render: (r) => (
        <div>
          <div style={{ fontWeight: 600 }}>{formatRial(r.amount_rials)}</div>
          {r.status === 'partial' && (
            <div style={{ fontSize: 11.5, color: 'var(--text-3)', marginTop: 2 }}>
              پرداخت‌شده: {formatRial(r.paid_rials)}
            </div>
          )}
        </div>
      ),
    },
    { key: 'status', header: 'وضعیت', render: (r) => <StatusBadge type="invoice" value={r.status} /> },
  ];

  return (
    <>
      <PageHeader
        title="لیست پرداخت‌ها"
        description="پرداخت‌های ثبت‌شده‌ی بیماران شما"
        breadcrumbs={[{ label: 'داشبورد', to: '/admin' }, { label: 'لیست پرداخت‌ها' }]}
      />

      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(200px, 1fr))', gap: 'var(--gap)', marginBottom: 'var(--gap)' }}>
        <StatCard tone="violet" label="مجموع صورتحساب‌ها" value={formatRial(summary?.total_rials ?? 0)} />
        <StatCard tone="green" label="پرداخت‌شده" value={formatRial(summary?.paid_rials ?? 0)} />
        <StatCard tone="pink" label="تسویه‌نشده" value={formatRial(summary?.unsettled_rials ?? 0)} />
        <StatCard tone="amber" label="تعداد صورتحساب" value={formatNumber(summary?.invoices_count ?? 0)} />
      </div>

      <div className="card" style={{ padding: 18 }}>
        <div style={{ display: 'flex', flexWrap: 'wrap', gap: 10, alignItems: 'flex-end', marginBottom: 16 }}>
          <div style={{ minWidth: 150 }}>
            <label className="field-label">وضعیت</label>
            <SearchableSelect
              options={STATUS_OPTIONS}
              value={status}
              onChange={(v) => setParam({ status: v ? String(v) : '' })}
              placeholder="همه وضعیت‌ها"
              height={38}
            />
          </div>
          <div style={{ minWidth: 140 }}>
            <label className="field-label">از تاریخ</label>
            <PersianDatePicker value={from} onChange={(v) => setParam({ from: v })} height={38} />
          </div>
          <div style={{ minWidth: 140 }}>
            <label className="field-label">تا تاریخ</label>
            <PersianDatePicker value={to} onChange={(v) => setParam({ to: v })} height={38} />
          </div>
          <div style={{ display: 'flex', gap: 6 }}>
            <button className="btn ghost sm" onClick={() => setParam({ from: isoNDaysAgo(30), to: todayIso() })}>یک ماه اخیر</button>
            <button className="btn ghost sm" onClick={() => setParam({ from: isoNDaysAgo(365), to: todayIso() })}>یک سال اخیر</button>
            {hasFilters && (
              <button
                className="btn ghost sm"
                onClick={() => setParams(new URLSearchParams(), { replace: true })}
                style={{ display: 'flex', alignItems: 'center', gap: 4 }}
              >
                <ArrowPathIcon style={{ width: 13 }} /> پاک‌کردن فیلترها
              </button>
            )}
          </div>
        </div>

        <DataTable
          columns={columns}
          data={rows}
          loading={listQuery.isLoading}
          searchValue={search}
          onSearchChange={(v) => setParam({ search: v.replace(/\D/g, '') })}
          searchPlaceholder="کد ملی بیمار"
          emptyMessage="پرداختی ثبت نشده است."
          actions={(row) => (
            <button className="btn primary sm" onClick={() => navigate(`/admin/my-payments/${row.patient_uuid}`)}>
              جزئیات
            </button>
          )}
        />

        {total > MY_PAYMENTS_LIMIT && (
          <Pagination page={page} total={total} limit={MY_PAYMENTS_LIMIT} onPageChange={(p) => setParam({ page: String(p) })} />
        )}
      </div>
    </>
  );
}
