import { useState, useMemo } from 'react';
import { useNavigate } from 'react-router-dom';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import {
  TrashIcon, EnvelopeIcon, ArrowPathIcon, NoSymbolIcon, EyeIcon, ShieldCheckIcon,
} from '@heroicons/react/24/outline';
import { toast } from 'sonner';
import { api } from '../lib/api';
import type { ApiResponse, PaginatedResponse } from '../lib/api';
import { formatNumber } from '../lib/utils';
import ConfirmDialog from './ui/ConfirmDialog';
import InviteDoctorModal from './ui/InviteDoctorModal';
import DoctorPermissionsModal from './ui/DoctorPermissionsModal';

const HUES_LIST = [256, 205, 162, 295, 272];

export interface ClinicDoctorItem {
  id: string; uuid: string; name: string;
  gender: string | null; degree: string | null;
  img: { url: string }[];
  specialties: { id: string; name: string }[];
  active: boolean;
}

export interface ClinicInvitation {
  uuid: string;
  mobile: string;
  invited_name: string | null;
  invited_specialty: string | null;
  status: 'pending' | 'accepted' | 'rejected' | 'suspended' | 'removed';
  token_used: boolean;
  invited_at: number;
  expires_at: number;
  responded_at: number | null;
  doctor: { uuid: string; name: string } | null;
}

const INV_STATUS_MAP: Record<string, { label: string; cls: string }> = {
  pending:   { label: 'در انتظار',   cls: 'amber' },
  accepted:  { label: 'پذیرفته‌شده', cls: 'green' },
  rejected:  { label: 'رد شده',      cls: 'gray'  },
  suspended: { label: 'تعلیق',       cls: 'violet' },
  removed:   { label: 'حذف‌شده',     cls: 'gray'  },
};

/**
 * ClinicDoctorsManager — self-contained management of a clinic's doctors and
 * pending invitations (list, invite, resend, suspend, delete invitation, detach
 * doctor). Reused by both the admin ClinicDetailPage and the clinic-owner
 * settings tab (ClinicDoctorsPage). `readOnly` hides every mutating control.
 */
export default function ClinicDoctorsManager({ clinicUuid, readOnly = false }: {
  clinicUuid: string;
  readOnly?: boolean;
}) {
  const navigate = useNavigate();
  const qc = useQueryClient();

  const [doctorsTab, setDoctorsTab] = useState<'doctors' | 'invitations'>('doctors');
  const [inviteOpen, setInviteOpen] = useState(false);
  const [detachDoctorConfirm, setDetachDoctorConfirm] = useState<ClinicDoctorItem | null>(null);
  const [permissionsFor, setPermissionsFor] = useState<ClinicDoctorItem | null>(null);

  const doctorsQ = useQuery({
    queryKey: ['clinic-doctors', clinicUuid],
    queryFn:  () => api.get<ApiResponse<{ data: ClinicDoctorItem[] }>>(`/api/v1/clinic/doctor-list/${clinicUuid}`),
    enabled:  !!clinicUuid,
  });

  const invitationsQ = useQuery({
    queryKey: ['clinic-invitations', clinicUuid],
    queryFn:  () => api.get<PaginatedResponse<ClinicInvitation>>(`/api/v1/admin/clinic/${clinicUuid}/invitations?limit=50`),
    enabled:  !!clinicUuid,
  });

  const doctorList: ClinicDoctorItem[] = useMemo(() => {
    const raw = doctorsQ.data?.data;
    return (raw as any)?.data ?? raw ?? [];
  }, [doctorsQ.data]);

  const invitationList: ClinicInvitation[] = invitationsQ.data?.data ?? [];

  const resendInvMut = useMutation({
    mutationFn: (invUuid: string) => api.post<ApiResponse<any>>(`/api/v1/admin/clinic/invitation/${invUuid}/resend`, {}),
    onSuccess: () => { toast.success('پیامک مجدداً ارسال شد'); qc.invalidateQueries({ queryKey: ['clinic-invitations', clinicUuid] }); },
    onError:   (e: Error) => toast.error(e.message),
  });

  const changeInvStatusMut = useMutation({
    mutationFn: ({ invUuid, status }: { invUuid: string; status: string }) =>
      api.patch<ApiResponse<any>>(`/api/v1/admin/clinic/invitation/${invUuid}/status`, { status }),
    onSuccess: (_d, v) => {
      toast.success(v.status === 'pending' ? 'دعوتنامه فعال و پیامک مجدداً ارسال شد' : 'دعوتنامه تعلیق شد');
      qc.invalidateQueries({ queryKey: ['clinic-invitations', clinicUuid] });
    },
    onError:   (e: Error) => toast.error(e.message),
  });

  const deleteInvMut = useMutation({
    mutationFn: (invUuid: string) => api.delete<ApiResponse<null>>(`/api/v1/admin/clinic/invitation/${invUuid}`),
    onSuccess: () => { toast.success('دعوتنامه حذف شد'); qc.invalidateQueries({ queryKey: ['clinic-invitations', clinicUuid] }); },
    onError:   (e: Error) => toast.error(e.message),
  });

  const detachDoctorMut = useMutation({
    mutationFn: (doctorUuid: string) =>
      api.delete<ApiResponse<{ message: string }>>(`/api/v1/admin/clinic/${clinicUuid}/doctor/${doctorUuid}`),
    onSuccess: () => {
      toast.success('پزشک از کلینیک جدا شد');
      qc.invalidateQueries({ queryKey: ['clinic-doctors', clinicUuid] });
      qc.invalidateQueries({ queryKey: ['clinic-detail', clinicUuid] });
    },
    onError: (e: Error) => toast.error(e.message),
  });

  return (
    <>
      <div className="card card-pad">
        {/* Card header */}
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 12 }}>
          <div className="seg">
            <button className={doctorsTab === 'doctors' ? 'active' : ''} onClick={() => setDoctorsTab('doctors')}>
              پزشکان ({formatNumber(doctorList.length)})
            </button>
            <button className={doctorsTab === 'invitations' ? 'active' : ''} onClick={() => setDoctorsTab('invitations')}>
              دعوتنامه‌ها ({formatNumber(invitationList.length)})
            </button>
          </div>
          {!readOnly && (
            <button className="btn primary sm" onClick={() => setInviteOpen(true)}>
              <EnvelopeIcon style={{ width: 14, height: 14 }} /> دعوت پزشک
            </button>
          )}
        </div>

        {/* Doctors tab */}
        {doctorsTab === 'doctors' && (
          doctorList.length === 0 ? (
            <div className="empty" style={{ padding: '20px 0' }}>
              <p className="muted">هیچ پزشکی به این کلینیک متصل نیست</p>
            </div>
          ) : (
            <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
              {doctorList.map(doc => {
                const dHue = HUES_LIST[(doc.uuid?.charCodeAt(0) ?? 0) % HUES_LIST.length];
                const img  = doc.img?.[0]?.url;
                return (
                  <div key={doc.id} style={{ display: 'flex', alignItems: 'center', gap: 10, padding: '8px 10px', borderRadius: 8, background: 'var(--surface-2, var(--bg))' }}>
                    {img
                      ? <img src={img} alt="" className="avatar sm" style={{ objectFit: 'cover', flexShrink: 0 }} />
                      : <div className="avatar sm" style={{ background: `linear-gradient(145deg, oklch(0.62 0.15 ${dHue}), oklch(0.48 0.16 ${dHue}))`, flexShrink: 0 }}>{doc.name?.[0] ?? '?'}</div>
                    }
                    <div style={{ flex: 1, minWidth: 0 }}>
                      <div style={{ fontWeight: 600, fontSize: 13 }}>{doc.name}</div>
                      {doc.specialties?.length > 0 && (
                        <div className="muted" style={{ fontSize: 11 }}>{doc.specialties.map(s => s.name).join('، ')}</div>
                      )}
                    </div>
                    <div style={{ display: 'flex', alignItems: 'center', gap: 6 }}>
                      <span className={`badge ${doc.active ? 'green' : 'gray'}`} style={{ fontSize: 11 }}>
                        <span className="bdot" />{doc.active ? 'فعال' : 'غیرفعال'}
                      </span>
                      <button
                        className="mini-btn"
                        title="مشاهده پروفایل"
                        onClick={() => navigate(`/admin/doctors/${doc.uuid}`)}
                      >
                        <EyeIcon style={{ width: 14, height: 14 }} />
                      </button>
                      {!readOnly && (
                        <>
                          <button
                            className="mini-btn"
                            title="مدیریت دسترسی‌ها"
                            onClick={() => setPermissionsFor(doc)}
                          >
                            <ShieldCheckIcon style={{ width: 14, height: 14 }} />
                          </button>
                          <button
                            className="mini-btn danger"
                            title="جداسازی از کلینیک"
                            onClick={() => setDetachDoctorConfirm(doc)}
                          >
                            <TrashIcon style={{ width: 14, height: 14 }} />
                          </button>
                        </>
                      )}
                    </div>
                  </div>
                );
              })}
            </div>
          )
        )}

        {/* Invitations tab */}
        {doctorsTab === 'invitations' && (
          invitationList.length === 0 ? (
            <div className="empty" style={{ padding: '20px 0' }}>
              <EnvelopeIcon style={{ width: 30, height: 30 }} />
              <p className="muted">هیچ دعوتنامه‌ای ارسال نشده</p>
            </div>
          ) : (
            <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
              {invitationList.map(inv => {
                const statusInfo = INV_STATUS_MAP[inv.status] ?? { label: inv.status, cls: 'gray' };
                const isExpired  = !inv.token_used && inv.status === 'pending' && Date.now() / 1000 > inv.expires_at;
                return (
                  <div key={inv.uuid} style={{ display: 'flex', alignItems: 'center', gap: 10, padding: '10px 12px', borderRadius: 8, background: 'var(--surface-2, var(--bg))' }}>
                    <div style={{ flex: 1, minWidth: 0 }}>
                      <div style={{ fontWeight: 600, fontSize: 13 }}>{inv.invited_name ?? inv.mobile}</div>
                      <div style={{ display: 'flex', gap: 6, marginTop: 3, flexWrap: 'wrap', alignItems: 'center' }}>
                        <span className="muted" style={{ fontSize: 11, direction: 'ltr' }}>{inv.mobile}</span>
                        {inv.invited_specialty && (
                          <span className="muted" style={{ fontSize: 11 }}>{inv.invited_specialty}</span>
                        )}
                        {inv.doctor && (
                          <button
                            className="badge blue"
                            style={{ fontSize: 11, cursor: 'pointer', border: 'none', background: 'none', padding: 0 }}
                            onClick={() => navigate(`/admin/doctors/${inv.doctor!.uuid}`)}
                          >
                            <span className="bdot" />{inv.doctor.name}
                          </button>
                        )}
                      </div>
                    </div>
                    <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: 6 }}>
                      <span className={`badge ${isExpired ? 'gray' : statusInfo.cls}`} style={{ fontSize: 11 }}>
                        <span className="bdot" />{isExpired ? 'منقضی' : statusInfo.label}
                      </span>
                      {!readOnly && (
                        <div style={{ display: 'flex', gap: 4 }}>
                          {inv.status === 'pending' && (
                            <button
                              className="mini-btn"
                              title="ارسال مجدد"
                              disabled={resendInvMut.isPending}
                              onClick={() => resendInvMut.mutate(inv.uuid)}
                            >
                              <ArrowPathIcon style={{ width: 13, height: 13 }} />
                            </button>
                          )}
                          {inv.status !== 'removed' && inv.status !== 'accepted' && (
                            <button
                              className="mini-btn"
                              title={inv.status === 'suspended' ? 'فعال‌سازی و ارسال مجدد پیامک' : 'تعلیق'}
                              disabled={changeInvStatusMut.isPending}
                              onClick={() => changeInvStatusMut.mutate({ invUuid: inv.uuid, status: inv.status === 'suspended' ? 'pending' : 'suspended' })}
                            >
                              <NoSymbolIcon style={{ width: 13, height: 13 }} />
                            </button>
                          )}
                          <button
                            className="mini-btn danger"
                            title="حذف"
                            disabled={deleteInvMut.isPending}
                            onClick={() => deleteInvMut.mutate(inv.uuid)}
                          >
                            <TrashIcon style={{ width: 13, height: 13 }} />
                          </button>
                        </div>
                      )}
                    </div>
                  </div>
                );
              })}
            </div>
          )
        )}
      </div>

      {/* Detach Doctor From Clinic Confirm */}
      <ConfirmDialog
        open={detachDoctorConfirm !== null}
        title="جداسازی پزشک از کلینیک"
        message={`آیا پزشک "${detachDoctorConfirm?.name ?? ''}" از این کلینیک جدا شود؟ این کار فقط ارتباط پزشک با این کلینیک را حذف می‌کند.`}
        confirmLabel="جداسازی"
        danger
        loading={detachDoctorMut.isPending}
        onConfirm={() => {
          if (detachDoctorConfirm) detachDoctorMut.mutate(detachDoctorConfirm.uuid);
          setDetachDoctorConfirm(null);
        }}
        onCancel={() => setDetachDoctorConfirm(null)}
      />

      {/* Per-doctor clinic permissions */}
      {permissionsFor && (
        <DoctorPermissionsModal
          clinicUuid={clinicUuid}
          doctorUuid={permissionsFor.uuid}
          doctorName={permissionsFor.name}
          onClose={() => setPermissionsFor(null)}
        />
      )}

      {/* Invite doctor modal */}
      {inviteOpen && clinicUuid && (
        <InviteDoctorModal
          clinicUuid={clinicUuid}
          onClose={() => setInviteOpen(false)}
          onInvited={() => { qc.invalidateQueries({ queryKey: ['clinic-invitations', clinicUuid] }); setDoctorsTab('invitations'); }}
        />
      )}
    </>
  );
}