import { useEffect, useRef, useState, type CSSProperties } from 'react';
import { formatDate, formatRial } from '../lib/utils';
import { FilesServiceSuccess, FilesServiceMore } from './icons/FilesServiceIcons';

export interface SessionPaymentEntry {
  uuid: string;
  method: string;
  amount_rials: number;
  paid_at?: number;
  created_at?: number;
  created_by_name?: string | null;
}

export interface SessionCardData {
  uuid: string;
  services?: Array<{ service_item_uuid?: string; service_name?: string; name?: string; line_total_rials?: number; price_rials?: number; quantity?: number }>;
  // مطابق SessionConsumable::toArray در بک‌اند
  consumables?: Array<{ uuid?: string; inventory_item_uuid?: string; item_name?: string; unit?: string; price_rials?: number; quantity?: number; line_total_rials?: number }>;
  visit_price_rials?: number;
  services_total_rials?: number;
  session_at?: number | null;
  insurance_base_id?: number | null;
  insurance_supplementary_id?: number | null;
  /** نوع خدمتِ بیمه‌ایِ این مراجعه (سرپایی/بستری) و نام بیمهٔ پایه. */
  insurance_service_category?: string | null;
  insurance_service_category_label?: string | null;
  insurance_base_name?: string | null;
  base_insurance_discount_percent?: number;
  supplementary_discount_percent?: number;
  doctor_name?: string | null;
  final_price_rials?: number;
  // تفکیک بیمه — سرور محاسبه می‌کند (PatientSession::applyShares)
  gross_total_rials?: number;
  base_insurance_rials?: number;
  supplementary_insurance_rials?: number;
  patient_share_rials?: number;
  remaining_rials?: number;
  patient_debt_rials?: number;
  is_paid?: boolean;
  invoice_uuid?: string | null;
  notes?: string | null;
  archived?: boolean;
  created_at?: number;
  // تسویه چندتکه + تخفیف (backend session settlement fields)
  discount_type?: 'percent' | 'fixed' | null;
  discount_value?: number;
  discount_rials?: number;
  applied_discount_rule_label?: string | null;
  paid_total_rials?: number;
  paid_at?: number | null;
  payments?: SessionPaymentEntry[];
}

/** label:value row inside the service card (mirrors tauri ServiceInfoRow). */
function Row({ label, value, valueStyle }: { label: string; value: string; valueStyle?: CSSProperties }) {
  return (
    <div style={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', gap: 6, margin: '6px 0' }}>
      <span style={{ fontSize: 12, color: 'var(--text-2)' }}>{label}:</span>
      <span style={{ fontSize: 14, color: 'var(--text)', textAlign: 'left', ...valueStyle }}>{value}</span>
    </div>
  );
}

/**
 * A patient «مراجعه» (session) card — visit + performed services — ported
 * pixel-for-pixel from tauri files/services/ServiceCard. Paid cards show
 * «مشاهده فاکتور», unpaid ones «تکمیل پرداخت».
 */
export default function SessionServiceCard({ session, onSettle, onViewInvoice, onArchive, onEdit, onViewAudit, settling, issuing }: {
  session: SessionCardData;
  onSettle: (uuid: string) => void;
  /** کل session پاس می‌شود؛ اگر invoice_uuid نداشت، caller فاکتور را می‌سازد. */
  onViewInvoice: (session: SessionCardData) => void;
  /** آرشیو/خروج از آرشیو مراجعه. */
  onArchive?: (session: SessionCardData, archived: boolean) => void;
  /** ویرایش سرویس‌های مراجعه. */
  onEdit?: (session: SessionCardData) => void;
  /** نمایش تاریخچه‌ی تغییرات (Audit Log). */
  onViewAudit?: (session: SessionCardData) => void;
  settling?: boolean;
  /** true وقتی صدور فاکتور همین لحظه در جریان است (دکمه قفل می‌شود). */
  issuing?: boolean;
}) {
  const paid = !!session.is_paid;
  const [menuOpen, setMenuOpen] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);
  useEffect(() => {
    if (!menuOpen) return;
    const onDoc = (e: MouseEvent) => { if (menuRef.current && !menuRef.current.contains(e.target as Node)) setMenuOpen(false); };
    document.addEventListener('mousedown', onDoc);
    return () => document.removeEventListener('mousedown', onDoc);
  }, [menuOpen]);
  const names = (session.services ?? []).map((s) => s.service_name || s.name).filter(Boolean) as string[];
  if ((session.visit_price_rials ?? 0) > 0) names.unshift('ویزیت');
  // A «مراجعه» = the visit plus the services performed in it.
  const title = 'مراجعه';
  const subtitle = names.length ? names.join(' - ') : 'ویزیت';
  const debt = session.patient_debt_rials ?? 0;

  return (
    <div
      className="bg-[var(--surface)] border border-[var(--border)]"
      style={{ minWidth: 277, minHeight: 331, borderRadius: 12, padding: 14, display: 'flex', flexDirection: 'column', gap: 10, overflow: 'hidden', boxShadow: '0 1px 6px rgba(15,23,42,0.06)' }}
    >
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 2 }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 8, minWidth: 0 }}>
          <FilesServiceSuccess />
          <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-start', gap: 3, minWidth: 0 }}>
            <span style={{ display: 'flex', alignItems: 'center', gap: 6, fontSize: 14, fontWeight: 600, color: 'var(--text)', whiteSpace: 'nowrap', overflow: 'hidden', textOverflow: 'ellipsis', maxWidth: 180 }}>
              {title}
              {session.archived && <span className="badge" style={{ fontSize: 10, color: 'var(--text-3)', border: '1px solid var(--border-2)', borderRadius: 4, padding: '1px 6px' }}>آرشیو</span>}
            </span>
            <span style={{ fontSize: 12, color: 'var(--text-2)', whiteSpace: 'nowrap', overflow: 'hidden', textOverflow: 'ellipsis', maxWidth: 200 }}>{subtitle}</span>
          </div>
        </div>
        <div ref={menuRef} style={{ position: 'relative', flexShrink: 0 }}>
          <button type="button" aria-label="عملیات" onClick={() => setMenuOpen((o) => !o)}
            style={{ background: 'transparent', border: 'none', cursor: 'pointer', padding: 2, display: 'flex' }}>
            <FilesServiceMore style={{ color: 'var(--text-3)' }} />
          </button>
          {menuOpen && (
            <div className="card" style={{ position: 'absolute', insetInlineEnd: 0, top: '100%', marginTop: 4, minWidth: 150, zIndex: 20, padding: 4, background: 'var(--surface)', border: '1px solid var(--border)', borderRadius: 8, boxShadow: 'var(--shadow-lg)' }}>
              <button type="button" onClick={() => { setMenuOpen(false); onViewInvoice(session); }}
                style={{ display: 'block', width: '100%', textAlign: 'right', padding: '8px 10px', fontSize: 13, background: 'transparent', border: 'none', borderRadius: 6, cursor: 'pointer', color: 'var(--text)', fontFamily: 'inherit' }}>
                مشاهده فاکتور
              </button>
              {onEdit && (
                <button type="button" onClick={() => { setMenuOpen(false); onEdit(session); }}
                  style={{ display: 'block', width: '100%', textAlign: 'right', padding: '8px 10px', fontSize: 13, background: 'transparent', border: 'none', borderRadius: 6, cursor: 'pointer', color: 'var(--text)', fontFamily: 'inherit' }}>
                  ویرایش
                </button>
              )}
              {onViewAudit && (
                <button type="button" onClick={() => { setMenuOpen(false); onViewAudit(session); }}
                  style={{ display: 'block', width: '100%', textAlign: 'right', padding: '8px 10px', fontSize: 13, background: 'transparent', border: 'none', borderRadius: 6, cursor: 'pointer', color: 'var(--text)', fontFamily: 'inherit' }}>
                  تاریخچه تغییرات
                </button>
              )}
              {onArchive && (
                <button type="button" onClick={() => { setMenuOpen(false); onArchive(session, !session.archived); }}
                  style={{ display: 'block', width: '100%', textAlign: 'right', padding: '8px 10px', fontSize: 13, background: 'transparent', border: 'none', borderRadius: 6, cursor: 'pointer', color: session.archived ? 'var(--text)' : 'var(--danger)', fontFamily: 'inherit' }}>
                  {session.archived ? 'خروج از آرشیو' : 'آرشیو'}
                </button>
              )}
            </div>
          )}
        </div>
      </div>

      <div style={{ borderTop: '1px solid var(--border)' }} />

      <div style={{ display: 'flex', flexDirection: 'column', flex: 1, minHeight: 0, overflow: 'hidden', lineHeight: 1.9 }}>
        <Row label="انجام دهنده" value={session.doctor_name || '—'} />
        <Row label="تاریخ" value={session.created_at ? formatDate(session.created_at) : '—'} />
        <Row label="توضیحات" value={session.notes || '—'} valueStyle={{ display: 'flex', textAlign: 'right', width: '100%' }} />
      </div>

      <div style={{ borderTop: '1px solid var(--border)' }} />

      <div style={{ display: 'flex', flexDirection: 'column', width: '100%' }}>
        {session.insurance_service_category_label && (
          <Row label="نوع خدمت بیمه" value={session.insurance_service_category_label} />
        )}
        {session.insurance_base_name && <Row label="بیمه" value={session.insurance_base_name} />}
        {(session.base_insurance_rials ?? 0) > 0 && (
          <Row label="سهم بیمه" value={formatRial(session.base_insurance_rials ?? 0)} valueStyle={{ color: 'var(--success)', fontWeight: 500 }} />
        )}
        <Row label="هزینه" value={formatRial(session.final_price_rials ?? 0)} valueStyle={{ fontWeight: 500 }} />
        {!paid && <Row label="مانده بدهی" value={formatRial(debt)} valueStyle={{ color: 'var(--danger)', fontWeight: 500 }} />}
      </div>

      <div style={{ marginTop: 'auto' }}>
        {paid ? (
          <button
            type="button"
            disabled={issuing}
            onClick={() => onViewInvoice(session)}
            style={{ marginTop: 8, height: 40, width: '100%', borderRadius: 4, fontSize: 13, fontWeight: 500, cursor: 'pointer', color: 'var(--primary)', background: 'transparent', border: '1px solid var(--primary)' }}
          >
            {issuing ? 'در حال صدور…' : 'مشاهده فاکتور'}
          </button>
        ) : (
          <button
            type="button"
            disabled={settling}
            onClick={() => onSettle(session.uuid)}
            style={{ marginTop: 8, height: 40, width: '100%', borderRadius: 4, fontSize: 13, fontWeight: 500, cursor: 'pointer', color: 'var(--on-primary)', background: 'var(--primary)', border: '1px solid var(--primary)' }}
          >
            تکمیل پرداخت
          </button>
        )}
      </div>
    </div>
  );
}