import { useEffect, useMemo, useState } from 'react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { PlusIcon } from '@heroicons/react/24/outline';
import { toast } from 'sonner';
import { api } from '../lib/api';
import type { ApiResponse } from '../lib/api';
import Modal from './ui/Modal';
import PersianDateInput from './ui/PersianDateInput';
import PriceInput from './ui/PriceInput';
import { WalletChargeLink } from './AppointmentActions';

interface Option { uuid: string; name?: string; full_name?: string }
interface PatientRow { uuid: string; user_name?: string; user_mobile?: string; user_national_code?: string }

const toEpoch = (isoDate: string, time: string) =>
  Math.floor(new Date(`${isoDate}T${time || '00:00'}`).getTime() / 1000);
const addMinutes = (time: string, min: number) => {
  const [h, m] = time.split(':').map(Number);
  const t = h * 60 + m + min;
  return `${String(Math.floor(t / 60) % 24).padStart(2, '0')}:${String(t % 60).padStart(2, '0')}`;
};

/**
 * اضافه کردن نوبت جدید (Figma add.pdf) — rich create form: patient
 * search-or-new, بخش/سرویس/پرسنل, date + default-duration + start/end time,
 * deposit toggle, status and notes. POSTs the extended /my/appointment.
 */
export default function NewAppointmentDrawer({ doctorUuid, defaultDate, queryKey, onClose, isReserve = false }: {
  doctorUuid: string;
  /** ISO Y-m-d — the currently viewed day. */
  defaultDate: string;
  queryKey: unknown[];
  onClose: () => void;
  /** true → «اضافه کردن نوبت رزرو» (day-level entry, no time fields). */
  isReserve?: boolean;
}) {
  const qc = useQueryClient();

  // ── patient: pick an existing record or enter a new person ────────────────
  const [patientSearch, setPatientSearch] = useState('');
  const [pickedPatient, setPickedPatient] = useState<PatientRow | null>(null);
  const [name, setName] = useState('');
  const [mobile, setMobile] = useState('');
  const [nationalCode, setNationalCode] = useState('');

  const patientsQ = useQuery<ApiResponse<PatientRow[]>>({
    queryKey: ['drawer-patients', patientSearch],
    queryFn: () => api.get(`/api/v1/patients?search=${encodeURIComponent(patientSearch)}&limit=10`),
    enabled: patientSearch.trim().length >= 2,
  });

  // ── service specs ──────────────────────────────────────────────────────────
  const [sectionUuid, setSectionUuid] = useState('');
  const [itemUuid, setItemUuid] = useState('');
  const [staffUuid, setStaffUuid] = useState('');

  // روش نوبت‌دهی پزشک: در حالت «سرویس» زمان از مدت سرویس محاسبه و پیشنهاد می‌شود.
  const scheduleQ = useQuery<ApiResponse<any>>({
    queryKey: ['drawer-schedule', doctorUuid],
    queryFn: () => api.get(`/api/v1/appointment-settings/weekly-schedule/${doctorUuid}`),
    enabled: !!doctorUuid,
  });
  const bookingMode: 'slot' | 'service' =
    ((scheduleQ.data?.data as any)?.data?.meta ?? (scheduleQ.data?.data as any)?.meta)?.booking_mode === 'service'
      ? 'service' : 'slot';
  const serviceMode = bookingMode === 'service' && !isReserve;

  const sectionsQ = useQuery<ApiResponse<Option[]>>({
    queryKey: ['service-sections'], queryFn: () => api.get('/api/v1/service-sections'),
  });
  const itemsQ = useQuery<ApiResponse<Option[]>>({
    queryKey: ['service-items', sectionUuid],
    queryFn: () => api.get(`/api/v1/service-items/${sectionUuid}`),
    enabled: !!sectionUuid,
  });
  const staffQ = useQuery<ApiResponse<Option[]>>({
    queryKey: ['staff-list'], queryFn: () => api.get('/api/v1/staff'),
  });

  // ── timing ─────────────────────────────────────────────────────────────────
  const [date, setDate] = useState(defaultDate);
  const [duration, setDuration] = useState(40);
  const [start, setStart] = useState('15:00');
  const [end, setEnd] = useState(addMinutes('15:00', 40));
  useEffect(() => { setEnd(addMinutes(start, duration)); }, [start, duration]);

  // ── service-mode: چند سرویس + زمان‌های خالیِ پیشنهادی ─────────────────────────
  const [serviceUuids, setServiceUuids] = useState<string[]>([]);
  const [svcNames, setSvcNames] = useState<Record<string, string>>({});
  const [pickedSlot, setPickedSlot] = useState<{ start: number; end: number } | null>(null);
  useEffect(() => { setPickedSlot(null); }, [serviceUuids, date]);

  const svcSlotsQ = useQuery<ApiResponse<any>>({
    queryKey: ['drawer-service-slots', doctorUuid, date, serviceUuids],
    queryFn: () => api.get(
      `/api/v1/appointment-service-slots?doctor_uuid=${doctorUuid}&date=${date}`
      + serviceUuids.map(u => `&service_item_uuids[]=${encodeURIComponent(u)}`).join('')
    ),
    enabled: serviceMode && !!date && serviceUuids.length > 0,
  });
  const svcSlots = ((svcSlotsQ.data?.data as any)?.start_times ?? []) as Array<{ start: number; end: number; start_time: string }>;
  const totalMinutes = (svcSlotsQ.data?.data as any)?.total_duration_minutes as number | undefined;

  // ── deposit / status / notes ───────────────────────────────────────────────
  const [depositRequired, setDepositRequired] = useState(false);
  const [depositRials, setDepositRials] = useState(0);
  const [status, setStatus] = useState('pending');
  const [note, setNote] = useState('');

  const effectiveName = pickedPatient?.user_name || name.trim();
  const effectiveMobile = pickedPatient?.user_mobile || mobile.trim();
  const effectiveNationalCode = (pickedPatient?.user_national_code || nationalCode).replace(/\D/g, '');
  const timingValid = isReserve
    ? true
    : serviceMode
      ? (serviceUuids.length > 0 && !!pickedSlot)
      : (!!start && !!end);
  const valid = !!doctorUuid && !!date && effectiveName.length >= 2 && effectiveMobile.length >= 10
    && effectiveNationalCode.length === 10 && timingValid;

  const create = useMutation({
    mutationFn: async () => {
      const slotStart = isReserve ? toEpoch(date, '00:00') : serviceMode ? pickedSlot!.start : toEpoch(date, start);
      const slotEnd   = isReserve ? toEpoch(date, '00:00') : serviceMode ? pickedSlot!.end   : toEpoch(date, end);
      const payload: Record<string, unknown> = {
        doctor_uuid: doctorUuid,
        slot_start: slotStart,
        slot_end: slotEnd,
        patient_name: effectiveName,
        patient_mobile: effectiveMobile,
        patient_national_code: effectiveNationalCode,
        is_reserve: isReserve,
        ...(sectionUuid ? { service_section_uuid: sectionUuid } : {}),
        // حالت سرویس: چند سرویس؛ حالت اسلاتی: تک سرویسِ workflow (اختیاری).
        ...(serviceMode ? { service_item_uuids: serviceUuids } : itemUuid ? { service_item_uuid: itemUuid } : {}),
        ...(staffUuid ? { staff_uuid: staffUuid } : {}),
        ...(depositRequired ? { deposit_required: true, deposit_amount_rials: depositRials } : {}),
        ...(note.trim() ? { note: note.trim() } : {}),
      };
      const res: any = await api.post('/api/v1/my/appointment', payload);
      // POST creates a pending booking; apply the picked status afterwards.
      if (status !== 'pending' && res?.data?.uuid) {
        await api.patch(`/api/v1/appointment/${res.data.uuid}/status`, { status, version: 1 });
      }
      return res;
    },
    onSuccess: () => {
      qc.invalidateQueries({ queryKey });
      toast.success(isReserve ? 'نوبت رزرو ثبت شد' : 'نوبت با موفقیت ثبت شد');
      onClose();
    },
    onError: (e: any) => toast.error(e.message || 'خطا در ثبت نوبت'),
  });

  const label = { fontSize: 12.5, color: 'var(--text-3)' } as const;
  const sel = { width: '100%', height: 38, borderRadius: 'var(--r-sm)', border: '1px solid var(--border)', background: 'var(--surface)', fontSize: 13, fontFamily: 'inherit', padding: '0 10px' } as const;
  const patients = useMemo(() => patientsQ.data?.data ?? [], [patientsQ.data]);

  return (
    <Modal open title={isReserve ? 'اضافه کردن نوبت رزرو' : 'اضافه کردن نوبت جدید'} onClose={onClose}>
      <div>
        <div style={{ fontSize: 13.5, fontWeight: 700, marginBottom: 10 }}>اطلاعات مراجعه کننده:</div>
        <label style={label}>انتخاب مراجعه کننده</label>
        <div className="field" style={{ margin: '6px 0 8px' }}>
          <input value={pickedPatient ? `${pickedPatient.user_name ?? ''} — ${pickedPatient.user_mobile ?? ''}` : patientSearch}
            onChange={e => { setPickedPatient(null); setPatientSearch(e.target.value); }}
            placeholder="جستجوی نام، شماره تماس، شماره پرونده..." />
        </div>
        {!pickedPatient && patients.length > 0 && (
          <div style={{ border: '1px solid var(--border)', borderRadius: 'var(--r-sm)', marginBottom: 10, overflow: 'hidden' }}>
            {patients.map(p => (
              <button key={p.uuid} onClick={() => setPickedPatient(p)} style={{
                display: 'block', width: '100%', padding: '8px 10px', fontSize: 13, textAlign: 'right',
                background: 'transparent', border: 'none', cursor: 'pointer', fontFamily: 'inherit',
              }}>
                {p.user_name} <span style={{ color: 'var(--text-3)', direction: 'ltr' }}>{p.user_mobile}</span>
              </button>
            ))}
          </div>
        )}
        {pickedPatient === null && (
          <>
            <div style={{ margin: '4px 0 10px' }}>
              <span className="badge" style={{ color: 'var(--primary)', border: '1px solid var(--primary)', borderRadius: 'var(--r-sm)', padding: '5px 10px', fontSize: 12, display: 'inline-flex', gap: 5, alignItems: 'center' }}>
                <PlusIcon style={{ width: 13 }} /> مراجعه کننده جدید
              </span>
            </div>
            <label style={label}>نام و نام خانوادگی مراجعه کننده</label>
            <div className="field" style={{ margin: '6px 0 10px' }}>
              <input value={name} onChange={e => setName(e.target.value)} placeholder="نام و نام خانوادگی مراجعه کننده را وارد نمایید" />
            </div>
            <label style={label}>شماره تماس</label>
            <div className="field" style={{ margin: '6px 0 12px' }}>
              <input value={mobile} onChange={e => setMobile(e.target.value)} placeholder="شماره تماس مراجعه کننده را وارد نمایید" dir="ltr" />
            </div>
            <label style={label}>کد ملی</label>
            <div className="field" style={{ margin: '6px 0 12px' }}>
              <input value={nationalCode} onChange={e => setNationalCode(e.target.value.replace(/\D/g, '').slice(0, 10))}
                placeholder="کد ملی مراجعه کننده را وارد نمایید" dir="ltr" inputMode="numeric" maxLength={10} />
            </div>
          </>
        )}

        <div style={{ fontSize: 13.5, fontWeight: 700, margin: '6px 0 10px' }}>مشخصات سرویس:</div>
        <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 10, marginBottom: 10 }}>
          <div>
            <label style={label}>بخش</label>
            <select aria-label="بخش" style={{ ...sel, marginTop: 6 }} value={sectionUuid} onChange={e => { setSectionUuid(e.target.value); setItemUuid(''); }}>
              <option value="">انتخاب بخش</option>
              {(sectionsQ.data?.data ?? []).map(o => <option key={o.uuid} value={o.uuid}>{o.name}</option>)}
            </select>
          </div>
          <div>
            <label style={label}>سرویس{serviceMode ? ' (یک یا چند)' : ''}</label>
            <select
              aria-label="سرویس"
              style={{ ...sel, marginTop: 6 }}
              value={serviceMode ? '' : itemUuid}
              disabled={!sectionUuid}
              onChange={e => {
                const uuid = e.target.value;
                if (!uuid) return;
                if (serviceMode) {
                  const name = (itemsQ.data?.data ?? []).find(o => o.uuid === uuid)?.name ?? '';
                  setServiceUuids(prev => prev.includes(uuid) ? prev : [...prev, uuid]);
                  setSvcNames(prev => ({ ...prev, [uuid]: name }));
                } else {
                  setItemUuid(uuid);
                }
              }}
            >
              <option value="">{serviceMode ? 'افزودن سرویس' : 'انتخاب سرویس'}</option>
              {(itemsQ.data?.data ?? []).map(o => <option key={o.uuid} value={o.uuid}>{o.name}</option>)}
            </select>
          </div>
        </div>
        {serviceMode && serviceUuids.length > 0 && (
          <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginBottom: 10 }}>
            {serviceUuids.map(uuid => (
              <span key={uuid} className="badge" style={{ display: 'inline-flex', alignItems: 'center', gap: 5, fontSize: 12, border: '1px solid var(--border)', borderRadius: 'var(--r-sm)', padding: '4px 8px' }}>
                {svcNames[uuid] ?? uuid}
                <button type="button" aria-label="حذف سرویس" onClick={() => setServiceUuids(prev => prev.filter(u => u !== uuid))}
                  style={{ border: 'none', background: 'transparent', cursor: 'pointer', color: 'var(--text-3)', fontSize: 14, lineHeight: 1 }}>×</button>
              </span>
            ))}
            {totalMinutes != null && <span style={{ fontSize: 12, color: 'var(--text-3)', alignSelf: 'center' }}>مدت کل: {totalMinutes} دقیقه</span>}
          </div>
        )}
        <label style={label}>انتخاب پرسنل</label>
        <select aria-label="پرسنل" style={{ ...sel, margin: '6px 0 12px' }} value={staffUuid} onChange={e => setStaffUuid(e.target.value)}>
          <option value="">انتخاب...</option>
          {(staffQ.data?.data ?? []).map(o => <option key={o.uuid} value={o.uuid}>{o.full_name}</option>)}
        </select>

        <div style={{ fontSize: 13.5, fontWeight: 700, margin: '6px 0 10px' }}>زمان نوبت:</div>
        <label style={label}>انتخاب تاریخ</label>
        <div style={{ margin: '6px 0 10px' }}><PersianDateInput value={date} onChange={setDate} /></div>

        {serviceMode ? (
          <div style={{ marginBottom: 12 }}>
            <label style={label}>زمان‌های خالی پیشنهادی</label>
            {serviceUuids.length === 0 ? (
              <div style={{ fontSize: 12.5, color: 'var(--text-3)', marginTop: 6 }}>ابتدا سرویس را انتخاب کنید.</div>
            ) : svcSlotsQ.isLoading ? (
              <div style={{ fontSize: 12.5, color: 'var(--text-3)', marginTop: 6 }}>در حال محاسبه...</div>
            ) : svcSlots.length === 0 ? (
              <div style={{ fontSize: 12.5, color: 'var(--danger)', marginTop: 6 }}>برای این سرویس در این روز زمان خالی کافی نیست؛ روز دیگری انتخاب کنید.</div>
            ) : (
              <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginTop: 6 }}>
                {svcSlots.map(s => {
                  const active = pickedSlot?.start === s.start;
                  return (
                    <button key={s.start} type="button" dir="ltr" onClick={() => setPickedSlot({ start: s.start, end: s.end })}
                      style={{ fontSize: 13, padding: '6px 12px', borderRadius: 'var(--r-sm)', cursor: 'pointer', fontFamily: 'inherit',
                        border: active ? '1px solid var(--primary)' : '1px solid var(--border)',
                        background: active ? 'var(--primary)' : 'var(--surface)', color: active ? '#fff' : 'var(--text)' }}>
                      {s.start_time}
                    </button>
                  );
                })}
              </div>
            )}
          </div>
        ) : (
          <>
            <label style={label}>زمان پیش فرض (دقیقه)</label>
            <div className="field" style={{ margin: '6px 0 10px' }}>
              <input aria-label="زمان پیش فرض" type="number" min={5} value={duration} onChange={e => setDuration(Math.max(5, Number(e.target.value) || 0))} dir="ltr" />
            </div>
            {!isReserve && (
              <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 10, marginBottom: 12 }}>
                <div>
                  <label style={label}>ساعت شروع</label>
                  <div className="field" style={{ marginTop: 6 }}><input aria-label="ساعت شروع" type="time" value={start} onChange={e => setStart(e.target.value)} dir="ltr" /></div>
                </div>
                <div>
                  <label style={label}>ساعت پایان</label>
                  <div className="field" style={{ marginTop: 6 }}><input aria-label="ساعت پایان" type="time" value={end} onChange={e => setEnd(e.target.value)} dir="ltr" /></div>
                </div>
              </div>
            )}
          </>
        )}

        {!isReserve && (
          <>
            <div style={{ fontSize: 13.5, fontWeight: 700, margin: '6px 0 10px' }}>بیعانه:</div>
            <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: 10 }}>
              <label style={{ display: 'inline-flex', alignItems: 'center', gap: 8, fontSize: 13, cursor: 'pointer' }}>
                <input type="checkbox" checked={depositRequired} onChange={e => setDepositRequired(e.target.checked)} />
                بیعانه مورد نیاز است.
              </label>
            </div>
            {depositRequired && (
              <div style={{ display: 'flex', alignItems: 'flex-end', gap: 10, marginBottom: 12 }}>
                <div style={{ flex: 1 }}>
                  <label style={label}>مبلغ بیعانه (تومان)</label>
                  <div style={{ marginTop: 6 }}>
                    <PriceInput value={depositRials} onChange={setDepositRials} />
                  </div>
                </div>
                <WalletChargeLink mobile={effectiveMobile} />
              </div>
            )}
          </>
        )}

        <label style={label}>انتخاب وضعیت</label>
        <select aria-label="وضعیت" style={{ ...sel, margin: '6px 0 12px' }} value={status} onChange={e => setStatus(e.target.value)}>
          <option value="pending">ثبت شده</option>
          <option value="confirmed">قطعی شده</option>
        </select>

        <div className="field" style={{ height: 'auto', marginBottom: 16 }}>
          <textarea value={note} onChange={e => setNote(e.target.value)} rows={3} placeholder="توضیحات..."
            style={{ width: '100%', border: 'none', background: 'transparent', fontFamily: 'inherit', resize: 'vertical' }} />
        </div>

        <button className="btn primary" style={{ width: '100%' }} disabled={!valid || create.isPending} onClick={() => create.mutate()}>
          ثبت نوبت
        </button>
      </div>
    </Modal>
  );
}