import { Fragment, useState } from 'react';
import { useNavigate, useParams } from 'react-router-dom';
import { ChevronRightIcon, ChevronDownIcon, PlusIcon } from '@heroicons/react/24/outline';
import { toast } from 'sonner';
import PageHeader from '../components/ui/PageHeader';
import Pagination from '../components/ui/Pagination';
import { formatRial, formatDate, formatNumber } from '../lib/utils';
import {
  usePatientInvoices,
  MY_PAYMENTS_LIMIT,
  type PatientInvoiceRow,
  type InvoiceRowStatus,
} from '../hooks/useMyPayments';

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

const EMPTY: PatientInvoiceRow[] = [];

/** 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));
}

/** پرداخت‌های ثبت‌شده — a single patient's recorded invoices (node 2). */
export default function MyPaymentDetailPage() {
  const { patientUuid } = useParams<{ patientUuid: string }>();
  const navigate = useNavigate();
  const [page, setPage] = useState(1);
  const [expanded, setExpanded] = useState<string | null>(null);

  const { data, isLoading } = usePatientInvoices(patientUuid, page);
  const payload = data?.data;
  const patient = payload?.patient;
  const rows = payload?.data ?? EMPTY;
  const total = payload?.meta?.totalRecords ?? 0;

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

  return (
    <>
      <PageHeader
        title="پرداخت‌های ثبت‌شده"
        action={
          <div style={{ display: 'flex', gap: 8 }}>
            <button className="btn sm" onClick={() => navigate('/admin/my-payments')}>
              <ChevronRightIcon style={{ width: 15 }} /> بازگشت
            </button>
            <button className="btn primary sm" onClick={() => toast.info('ثبت پرداخت جدید به‌زودی اضافه می‌شود')}>
              <PlusIcon style={{ width: 15 }} /> پرداخت جدید
            </button>
          </div>
        }
      />

      {/* سربرگ بیمار */}
      <div style={{
        display: 'flex', gap: 24, flexWrap: 'wrap', alignItems: 'center',
        marginBottom: 16, padding: '14px 16px',
        background: 'var(--surface)', border: '1px solid var(--border)', borderRadius: 'var(--r)',
      }}>
        <span style={{ fontSize: 14 }}>
          نام بیمار: <b style={{ fontWeight: 700 }}>{patient?.name ?? '—'}</b>
        </span>
        <span style={{ fontSize: 14, color: 'var(--text-2)' }} dir="ltr">
          کدملی: {patient?.national_code ?? '—'}
        </span>
      </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)' }}>
          <div style={{ fontWeight: 600, fontSize: 15, marginBottom: 6, color: 'var(--text-2)' }}>صورتحسابی ثبت نشده است</div>
          <div style={{ fontSize: 13 }}>برای این بیمار هنوز پرداخت ثبت‌شده‌ای وجود ندارد.</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}>شماره صورتحساب</th>
                  <th style={th}>تاریخ</th>
                  <th style={th}>ساعت</th>
                  <th style={th}>نوع خدمت</th>
                  <th style={th}>مبلغ کل (تومان)</th>
                  <th style={th}>وضعیت</th>
                  <th style={{ ...th, textAlign: 'left' }}>جزئیات</th>
                </tr>
              </thead>
              <tbody>
                {rows.map((row) => {
                  const open = expanded === row.uuid;
                  return (
                    <Fragment key={row.uuid}>
                      <tr style={{ borderBottom: open ? 'none' : '1px solid var(--border)' }}>
                        <td style={{ ...td, fontWeight: 600 }} dir="ltr">#{formatNumber(row.number)}</td>
                        <td style={td}>{formatDate(row.issued_at)}</td>
                        <td style={td} dir="ltr">{formatTime(row.issued_at)}</td>
                        <td style={{ ...td, color: 'var(--text-2)' }}>{row.service_title ?? '—'}</td>
                        <td style={{ ...td, fontWeight: 600 }}>{formatRial(row.total_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="btn sm ghost"
                            style={{ display: 'inline-flex', alignItems: 'center', gap: 4, color: 'var(--primary)' }}
                            onClick={() => setExpanded(open ? null : row.uuid)}
                          >
                            بیشتر <ChevronDownIcon style={{ width: 15, transform: open ? 'rotate(180deg)' : undefined, transition: 'transform .15s' }} />
                          </button>
                        </td>
                      </tr>
                      {open && (
                        <tr style={{ borderBottom: '1px solid var(--border)', background: 'var(--surface-2)' }}>
                          <td colSpan={7} style={{ padding: '10px 16px 14px' }}>
                            {row.items.length === 0 ? (
                              <span style={{ fontSize: 12.5, color: 'var(--text-3)' }}>آیتمی ثبت نشده است.</span>
                            ) : (
                              <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
                                {row.items.map((it) => (
                                  <div key={it.uuid} style={{ display: 'flex', justifyContent: 'space-between', gap: 12, fontSize: 13 }}>
                                    <span style={{ color: 'var(--text-2)' }}>
                                      {it.title}{it.quantity > 1 ? ` × ${formatNumber(it.quantity)}` : ''}
                                    </span>
                                    <span style={{ fontWeight: 600 }}>{formatRial(it.total_rials)}</span>
                                  </div>
                                ))}
                              </div>
                            )}
                          </td>
                        </tr>
                      )}
                    </Fragment>
                  );
                })}
              </tbody>
            </table>
          </div>
          <div style={{ marginTop: 16 }}>
            <Pagination page={page} total={total} limit={MY_PAYMENTS_LIMIT} onPageChange={setPage} />
          </div>
        </>
      )}
    </>
  );
}