import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { MagnifyingGlassIcon, EyeIcon, BanknotesIcon } from '@heroicons/react/24/outline';
import PageHeader from '../components/ui/PageHeader';
import Pagination from '../components/ui/Pagination';
import PersianDateInput from '../components/ui/PersianDateInput';
import { formatRial, formatNumber, toDate } from '../lib/utils';
import {
  usePatientPayments,
  MY_PAYMENTS_LIMIT,
  type PatientPaymentRow,
  type PaymentRowStatus,
} from '../hooks/useMyPayments';

const STATUS_LABEL: Record<PaymentRowStatus, string> = {
  paid:      'پرداخت شده',
  unsettled: 'تسویه نشده',
  unpaid:    'پرداخت نشده',
};
const STATUS_BADGE: Record<PaymentRowStatus, string> = {
  paid:      'green',
  unsettled: 'amber',
  unpaid:    'red',
};

const EMPTY: PatientPaymentRow[] = [];

/** 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;
}

/** لیست پرداخت‌ها — per-patient payment summary for the logged-in doctor/clinic. */
export default function MyPaymentsPage() {
  const navigate = useNavigate();
  const [page, setPage] = useState(1);
  const [nationalCode, setNationalCode] = useState('');
  const [status, setStatus] = useState('');
  const [from, setFrom] = useState('');
  const [to, setTo] = useState('');

  const reset = () => setPage(1);

  const { data, isLoading } = usePatientPayments({
    page,
    national_code: nationalCode.trim() || undefined,
    status: status || undefined,
    from: from ? dayBound(from, false) : undefined,
    to: to ? dayBound(to, true) : undefined,
  });

  const rows = data?.data ?? EMPTY;
  const total = data?.meta?.totalRecords ?? 0;

  const th: React.CSSProperties = { textAlign: 'right', padding: '12px 16px', fontWeight: 600 };
  const td: React.CSSProperties = { padding: '12px 16px' };

  return (
    <>
      <PageHeader title="لیست پرداخت‌ها" description="خلاصه‌ی پرداخت‌های بیماران شما" />

      {/* فیلترها */}
      <div style={{ display: 'flex', gap: 10, marginBottom: 16, flexWrap: 'wrap', alignItems: 'center' }}>
        <div style={{
          flex: '1 1 240px', minWidth: 200, display: 'flex', alignItems: 'center', gap: 8,
          background: 'var(--surface)', border: '1px solid var(--border)', borderRadius: 'var(--r)', padding: '9px 12px',
        }}>
          <MagnifyingGlassIcon style={{ width: 18, color: 'var(--text-3)', flexShrink: 0 }} />
          <input
            style={{ border: 'none', outline: 'none', background: 'transparent', flex: 1, fontSize: 14 }}
            value={nationalCode}
            onChange={(e) => { setNationalCode(e.target.value.replace(/\D/g, '')); reset(); }}
            placeholder="کد ملی بیمار را وارد کنید..."
            dir="ltr"
            inputMode="numeric"
          />
        </div>

        <select
          className="input"
          style={{ flex: '0 0 auto', width: 160 }}
          value={status}
          onChange={(e) => { setStatus(e.target.value); reset(); }}
          aria-label="وضعیت"
        >
          <option value="">همه وضعیت‌ها</option>
          <option value="paid">پرداخت شده</option>
          <option value="unsettled">تسویه نشده</option>
          <option value="unpaid">پرداخت نشده</option>
        </select>

        <div style={{ width: 150 }}>
          <PersianDateInput value={from} onChange={(v) => { setFrom(v); reset(); }} placeholder="از تاریخ" />
        </div>
        <div style={{ width: 150 }}>
          <PersianDateInput value={to} onChange={(v) => { setTo(v); reset(); }} placeholder="تا تاریخ" />
        </div>
      </div>

      {isLoading ? (
        <div className="card" style={{ padding: 32, textAlign: 'center', color: 'var(--text-3)' }}>در حال بارگذاری…</div>
      ) : rows.length === 0 ? (
        <div className="card" style={{ padding: '60px 24px', textAlign: 'center', color: 'var(--text-3)' }}>
          <BanknotesIcon style={{ width: 48, margin: '0 auto 16px', display: 'block', opacity: 0.4 }} />
          <div style={{ fontWeight: 600, fontSize: 15, marginBottom: 6, color: 'var(--text-2)' }}>پرداختی یافت نشد</div>
          <div style={{ fontSize: 13 }}>با ثبت صورتحساب برای بیماران، این فهرست پر می‌شود.</div>
        </div>
      ) : (
        <>
          <div className="card" style={{ overflowX: 'auto' }}>
            <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 13.5 }}>
              <thead>
                <tr style={{ borderBottom: '1px solid var(--border)', color: 'var(--text-3)', fontSize: 12 }}>
                  <th style={th}>ردیف</th>
                  <th style={th}>نام بیمار</th>
                  <th style={th}>کد ملی</th>
                  <th style={th}>تعداد صورتحساب</th>
                  <th style={th}>مبلغ پرداختی</th>
                  <th style={th}>مبلغ باقیمانده</th>
                  <th style={th}>وضعیت</th>
                  <th style={{ ...th, textAlign: 'left' }}>عملیات</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row, i) => (
                  <tr key={row.patient_uuid} style={{ borderBottom: '1px solid var(--border)' }}>
                    <td style={td}>{formatNumber((page - 1) * MY_PAYMENTS_LIMIT + i + 1)}</td>
                    <td style={{ ...td, fontWeight: 600 }}>{row.patient_name ?? '—'}</td>
                    <td style={{ ...td, color: 'var(--text-2)' }} dir="ltr">{row.national_code ?? '—'}</td>
                    <td style={td}>{formatNumber(row.invoice_count)}</td>
                    <td style={{ ...td, fontWeight: 600 }}>{formatRial(row.paid_rials)}</td>
                    <td style={{ ...td, color: row.remaining_rials > 0 ? 'var(--danger)' : 'var(--text-2)' }}>
                      {formatRial(row.remaining_rials)}
                    </td>
                    <td style={td}>
                      <span className={`badge ${STATUS_BADGE[row.status]}`}><span className="bdot" />{STATUS_LABEL[row.status]}</span>
                    </td>
                    <td style={{ ...td, textAlign: 'left' }}>
                      <button
                        className="cp-btn-secondary"
                        style={{ height: 32, padding: '0 12px', display: 'inline-flex', alignItems: 'center', gap: 5 }}
                        onClick={() => navigate(`/admin/my-payments/${row.patient_uuid}`)}
                      >
                        <EyeIcon style={{ width: 15 }} /> مشاهده
                      </button>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
          <div style={{ marginTop: 16 }}>
            <Pagination page={page} total={total} limit={MY_PAYMENTS_LIMIT} onPageChange={setPage} />
          </div>
        </>
      )}
    </>
  );
}