import React, { useState, useRef } from 'react';
import { useConfigContext } from '../../contexts/ConfigContext';
import './UserCard.css';

const UserCard = ({ user, onAvailabilityToggle, onGPSUpdate, onEdit, onDelete, onPhotoUpload, onPhotoDelete, onGenerateInvite }) => {
  const { userTypeLabels } = useConfigContext();
  const [lat, setLat] = useState(user.gps?.lat?.toString() || '');
  const [lng, setLng] = useState(user.gps?.lng?.toString() || '');
  const [isEditingGPS, setIsEditingGPS] = useState(false);
  const [photoUploading, setPhotoUploading] = useState(false);
  const [invite, setInvite] = useState(null);
  const [inviteLoading, setInviteLoading] = useState(false);
  const photoInputRef = useRef(null);

  const handleGPSUpdate = () => {
    if (lat && lng) {
      onGPSUpdate(user._id, parseFloat(lat), parseFloat(lng));
      setIsEditingGPS(false);
    }
  };

  const handleDelete = () => {
    if (window.confirm(`Möchten Sie "${user.name}" wirklich löschen?`)) {
      onDelete(user._id);
    }
  };

  const handlePhotoUpload = (e) => {
    const file = e.target.files[0];
    if (!file) return;
    if (!file.type.startsWith('image/')) {
      alert('Nur Bilddateien erlaubt (JPG, PNG, ...)');
      return;
    }
    if (file.size > 500 * 1024) {
      alert('Foto darf max. 500 KB groß sein');
      return;
    }
    setPhotoUploading(true);
    const reader = new FileReader();
    reader.onload = async (ev) => {
      await onPhotoUpload(user._id, ev.target.result);
      setPhotoUploading(false);
    };
    reader.readAsDataURL(file);
    e.target.value = '';
  };

  const handlePhotoDelete = () => {
    if (window.confirm('Foto wirklich entfernen?')) {
      onPhotoDelete(user._id);
    }
  };

  const handleGenerateInvite = async () => {
    if (!onGenerateInvite) return;
    setInviteLoading(true);
    const result = await onGenerateInvite(user._id);
    if (result?.success) {
      setInvite(result.data);
    }
    setInviteLoading(false);
  };

  return (
    <div className={`user-card-admin ${user.available ? 'card-available' : 'card-unavailable'}`}>
      <div className="user-header">
        <div className="user-name-row">
          <span className={`status-dot ${user.available ? 'dot-green' : 'dot-red'}`} title={user.available ? 'Verfügbar' : 'Nicht verfügbar'} />
          <h3 className="user-name">{user.name}</h3>
        </div>
        <label className="availability-toggle">
          <input
            type="checkbox"
            checked={user.available}
            onChange={(e) => onAvailabilityToggle(user._id, e.target.checked)}
          />
          <span className={`toggle-label ${user.available ? 'label-green' : 'label-red'}`}>
            {user.available ? '✅ Verfügbar' : '🔴 Nicht verfügbar'}
          </span>
        </label>
      </div>

      <div className="user-info">
        <p className="user-address">📍 {user.address}</p>
        <p className="user-type">
          <span className="type-badge">{userTypeLabels[user.type] || user.type}</span>
        </p>
        <a href={`tel:${user.phone}`} className="user-phone">
          📱 {user.phone}
        </a>
        {user.landline && (
          <a href={`tel:${user.landline}`} className="user-phone">
            📞 {user.landline}
          </a>
        )}
      </div>

      <div className="photo-section">
        <h4>Foto</h4>
        {user.photo ? (
          <div className="photo-preview">
            <img src={user.photo} alt={user.name} className="user-photo-thumb" />
          </div>
        ) : (
          <div className="user-photo-placeholder">Kein Foto</div>
        )}
        <div className="photo-actions">
          <input
            ref={photoInputRef}
            type="file"
            accept="image/*"
            style={{ display: 'none' }}
            onChange={handlePhotoUpload}
          />
          <button
            type="button"
            className="btn btn-secondary btn-sm"
            onClick={() => photoInputRef.current.click()}
            disabled={photoUploading}
          >
            {photoUploading ? 'Lädt…' : user.photo ? 'Ersetzen' : 'Hochladen'}
          </button>
          {user.photo && (
            <button type="button" className="btn btn-danger btn-sm" onClick={handlePhotoDelete}>
              Entfernen
            </button>
          )}
        </div>
        <p className="settings-hint">Max. 500 KB, JPG oder PNG</p>
      </div>

      <div className="gps-section">
        <h4>GPS-Koordinaten</h4>
        {!isEditingGPS ? (
          <div className="gps-display">
            {user.gps && user.gps.lat && user.gps.lng ? (
              <span>
                {user.gps.lat.toFixed(6)}, {user.gps.lng.toFixed(6)}
              </span>
            ) : (
              <span className="no-gps">Keine GPS-Daten</span>
            )}
            <button
              className="edit-gps-button"
              onClick={() => setIsEditingGPS(true)}
            >
              GPS bearbeiten
            </button>
          </div>
        ) : (
          <div className="gps-edit">
            <div className="gps-inputs">
              <input
                type="number"
                placeholder="Latitude"
                value={lat}
                onChange={(e) => setLat(e.target.value)}
                step="any"
                className="gps-input"
              />
              <input
                type="number"
                placeholder="Longitude"
                value={lng}
                onChange={(e) => setLng(e.target.value)}
                step="any"
                className="gps-input"
              />
            </div>
            <div className="gps-actions">
              <button
                className="save-gps-button"
                onClick={handleGPSUpdate}
                disabled={!lat || !lng}
              >
                Speichern
              </button>
              <button
                className="cancel-gps-button"
                onClick={() => {
                  setIsEditingGPS(false);
                  setLat(user.gps?.lat?.toString() || '');
                  setLng(user.gps?.lng?.toString() || '');
                }}
              >
                Abbrechen
              </button>
            </div>
          </div>
        )}
      </div>

      {/* Einladungs-Token: einmalig gültiger Code, mit dem der Hundeführer sein
          eigenes Passwort setzt. Ohne hinterlegte E-Mail nicht möglich. */}
      <div className="invite-section">
        <h4>Zugang für den Drohnenführer</h4>
        {!user.email ? (
          <p className="settings-hint">
            Keine E-Mail hinterlegt – ohne E-Mail ist kein Login möglich.
          </p>
        ) : (
          <>
            <button
              type="button"
              className="btn btn-secondary btn-sm"
              onClick={handleGenerateInvite}
              disabled={inviteLoading}
            >
              {inviteLoading ? 'Erzeuge…' : '🔑 Einladungs-Token erzeugen'}
            </button>
            {invite && (
              <div className="invite-result">
                <p className="settings-hint">
                  Diesen Token an <strong>{invite.email}</strong> weitergeben. Gültig bis{' '}
                  {new Date(invite.expiresAt).toLocaleDateString('de-DE')}.
                </p>
                <code className="invite-token">{invite.inviteToken}</code>
              </div>
            )}
          </>
        )}
      </div>

      <div className="card-actions">
        <button
          className="edit-button"
          onClick={() => {
            if (onEdit) {
              onEdit(user);
            } else {
              console.error('onEdit function is not defined');
            }
          }}
        >
          ✏️ Bearbeiten
        </button>
        <button
          className="delete-button"
          onClick={handleDelete}
        >
          🗑️ Löschen
        </button>
      </div>
    </div>
  );
};

export default UserCard;