import React, { useEffect, useMemo, useState } from 'react';
import { useTranslation } from 'react-i18next';
import { Project } from '../../entities/Project';
import { AccessLevel, grantShare, listShares, revokeShare } from '../../utils/sharesService';

interface ProjectShareModalProps {
  isOpen: boolean;
  onClose: () => void;
  project: Project;
}

interface ShareRow {
  user_id: number;
  access_level: AccessLevel;
  created_at: string;
  email?: string; // best-effort; may stay undefined without a lookup API
}

const isValidEmail = (value: string) => /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/.test(value);

const ProjectShareModal: React.FC<ProjectShareModalProps> = ({ isOpen, onClose, project }) => {
  const { t } = useTranslation();
  const [targetEmail, setTargetEmail] = useState('');
  const [access, setAccess] = useState<AccessLevel>('ro');
  const [submitting, setSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [rows, setRows] = useState<ShareRow[] | null>(null);
  const [loadingList, setLoadingList] = useState(false);

  const projectUid: string | null = useMemo(() => {
    // Prefer stable uid if present; fallback to id string if needed
    // Share APIs require resource_uid; projects list provides uid
    return (project as any).uid || null;
  }, [project]);

  useEffect(() => {
    if (!isOpen) return;
    setTargetEmail('');
    setAccess('ro');
    setError(null);
    if (!projectUid) return;
    const load = async () => {
      setLoadingList(true);
      try {
        const data = await listShares('project', projectUid);
        setRows(data);
      } catch (err: any) {
        setError(err.message || 'Failed to load shares');
        setRows([]);
      } finally {
        setLoadingList(false);
      }
    };
    load();
  }, [isOpen, projectUid]);

  if (!isOpen) return null;

  const onSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    if (!projectUid) {
      setError(t('errors.generic', 'Something went wrong'));
      return;
    }
    if (!isValidEmail(targetEmail)) {
      setError(t('errors.invalidEmail', 'Invalid email address'));
      return;
    }
    setSubmitting(true);
    try {
      await grantShare({ resource_type: 'project', resource_uid: projectUid, target_user_email: targetEmail, access_level: access });
      setTargetEmail('');
      // refresh list
      const data = await listShares('project', projectUid);
      setRows(data);
    } catch (err: any) {
      setError(err.message || 'Failed to share');
    } finally {
      setSubmitting(false);
    }
  };

  const onRevoke = async (userId: number) => {
    if (!projectUid) return;
    try {
      await revokeShare('project', projectUid, userId);
      const data = await listShares('project', projectUid);
      setRows(data);
    } catch (err: any) {
      setError(err.message || 'Failed to revoke share');
    }
  };

  const accessLabel = (al: AccessLevel) => (al === 'rw' ? t('shares.readWrite', 'Read & write') : t('shares.readOnly', 'Read only'));

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black bg-opacity-50" onClick={onClose}>
      <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl w-full max-w-md" onClick={(e) => e.stopPropagation()}>
        <div className="px-6 py-4 border-b border-gray-200 dark:border-gray-700">
          <h3 className="text-lg font-semibold text-gray-900 dark:text-white">{t('projects.shareProject', 'Share project')}</h3>
          <p className="text-sm text-gray-500 dark:text-gray-400 mt-1 line-clamp-2">{project?.name}</p>
        </div>
        <form onSubmit={onSubmit} className="px-6 py-4 space-y-4">
          <div>
            <label className="block text-sm text-gray-700 dark:text-gray-300 mb-1">{t('shares.targetUser', 'User email')}</label>
            <input type="email" value={targetEmail} onChange={(e) => setTargetEmail(e.target.value)} className="w-full rounded border px-3 py-2 bg-white dark:bg-gray-700 border-gray-300 dark:border-gray-600 text-gray-900 dark:text-gray-100" placeholder={t('shares.emailPlaceholder', 'name@example.com')!} />
          </div>
          <div>
            <label className="block text-sm text-gray-700 dark:text-gray-300 mb-1">{t('shares.permission', 'Permission')}</label>
            <select value={access} onChange={(e) => setAccess(e.target.value as AccessLevel)} className="w-full rounded border px-3 py-2 bg-white dark:bg-gray-700 border-gray-300 dark:border-gray-600 text-gray-900 dark:text-gray-100">
              <option value="ro">{t('shares.readOnly', 'Read only')}</option>
              <option value="rw">{t('shares.readWrite', 'Read & write')}</option>
            </select>
          </div>
          {error && <div className="text-sm text-red-500">{error}</div>}
          <div className="flex justify-end space-x-2 pt-2">
            <button type="button" onClick={onClose} className="px-4 py-2 rounded bg-gray-200 dark:bg-gray-700 text-gray-800 dark:text-gray-200">{t('common.close', 'Close')}</button>
            <button type="submit" disabled={submitting || !targetEmail} className="px-4 py-2 rounded bg-blue-600 text-white disabled:opacity-60">{submitting ? t('common.saving', 'Saving...') : t('shares.share', 'Share')}</button>
          </div>
        </form>
        <div className="px-6 pb-5">
          <div className="text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">{t('shares.currentShares', 'Users with access')}</div>
          <div className="bg-gray-50 dark:bg-gray-900 border border-gray-200 dark:border-gray-700 rounded-md max-h-56 overflow-auto">
            {loadingList ? (
              <div className="p-3 text-sm text-gray-500">{t('common.loading', 'Loading...')}</div>
            ) : !rows || rows.length === 0 ? (
              <div className="p-3 text-sm text-gray-500">{t('shares.noShares', 'Not shared yet')}</div>
            ) : (
              <ul className="divide-y divide-gray-200 dark:divide-gray-700">
                {rows.map((r) => (
                  <li key={`${r.user_id}-${r.created_at}`} className="flex items-center justify-between px-3 py-2">
                    <div>
                      <div className="text-sm text-gray-900 dark:text-gray-100">{r.email || `#${r.user_id}`}</div>
                      <div className="text-xs text-gray-500">{accessLabel(r.access_level)}</div>
                    </div>
                    <button onClick={() => onRevoke(r.user_id)} className="px-2 py-1 text-xs rounded bg-red-50 text-red-600 border border-red-200 hover:bg-red-100 dark:bg-transparent dark:text-red-400 dark:border-red-500">
                      {t('shares.revoke', 'Revoke')}
                    </button>
                  </li>
                ))}
              </ul>
            )}
          </div>
        </div>
      </div>
    </div>
  );
};

export default ProjectShareModal;