import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { MagnifyingGlassIcon, EyeIcon, BanknotesIcon, UserPlusIcon } 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, formatDate, formatNumber, toDate } from '../lib/utils';
import {
  usePayments,
  MY_PAYMENTS_LIMIT,
  type PaymentRow,
} from '../hooks/useMyPayments';

const EMPTY: PaymentRow[] = [];

/** 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: '#fff', fontSize: 13, fontWeight: 700,
    }}>
      {(name ?? '؟').charAt(0)}
    </div>
  );
}

/** لیست پرداخت‌ها — flat list of the tenant's recorded invoices (ported from tauri /payments). */
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 } = usePayments({
    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="پرداخت‌های ثبت‌شده‌ی بیماران شما"
        action={
          <button className="btn primary sm" onClick={() => navigate('/admin/patients/new')}>
            <UserPlusIcon style={{ width: 16 }} /> اضافه کردن بیمار
          </button>
        }
      />

      {/* فیلترها — کد ملی + وضعیت + بازه‌ی تاریخ */}
      <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>
        </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}>تاریخ</th>
                  <th style={th}>مبلغ پرداخت‌شده</th>
                  <th style={{ ...th, textAlign: 'left' }}>عملیات</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row, i) => (
                  <tr key={row.invoice_uuid} style={{ borderBottom: '1px solid var(--border)' }}>
                    <td style={td}>{formatNumber((page - 1) * MY_PAYMENTS_LIMIT + i + 1)}</td>
                    <td style={td}>
                      <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                        <Avatar name={row.patient_name} />
                        <span style={{ fontWeight: 600 }}>{row.patient_name ?? '—'}</span>
                      </div>
                    </td>
                    <td style={{ ...td, color: 'var(--text-2)' }} dir="ltr">{row.national_code ?? '—'}</td>
                    <td style={td} dir="ltr">{formatDate(row.issued_at)} - {formatTime(row.issued_at)}</td>
                    <td style={{ ...td, fontWeight: 600 }}>{formatRial(row.amount_rials)}</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>
        </>
      )}
    </>
  );
}