/**
 * PermissionMatrix
 *
 * User × Role matrix with inline toggles and edit/remove actions.
 */

import React, { useState, useCallback } from 'react';
import { FaEdit, FaTrash } from 'react-icons/fa';
import { useConfirm } from '../../hooks/useConfirm';
import type { FeatureAccessUser } from '../../hooks/useFeatureAccess';
import type { FeatureInstanceRole } from '../../hooks/useFeatureAccess';
import styles from './Admin.module.css';
import matrixStyles from './PermissionMatrix.module.css';

import { useLanguage } from '../../providers/language/LanguageContext';

export interface PermissionMatrixProps {
  users: FeatureAccessUser[];
  roles: FeatureInstanceRole[];
  onEditUser: (user: FeatureAccessUser) => void;
  onRemoveUser: (user: FeatureAccessUser) => void;
  onAddUser: () => void;
  disabled?: boolean;
}

export const PermissionMatrix: React.FC<PermissionMatrixProps> = ({ users,
  roles,
  onEditUser,
  onRemoveUser,
  onAddUser,
  disabled = false,
}) => {
  const { t } = useLanguage();
  const [removingId, setRemovingId] = useState<string | null>(null);
  const { confirm, ConfirmDialog } = useConfirm();

  const handleRemove = useCallback(async (user: FeatureAccessUser) => {
    if (removingId) return;
    const ok = await confirm(t('"{name}" aus dieser Instanz entfernen?', { name: user.username }), {
      title: t('Benutzer entfernen'),
      confirmLabel: t('Entfernen'),
      variant: 'danger',
    });
    if (!ok) return;
    setRemovingId(user.userId);
    onRemoveUser(user);
    setRemovingId(null);
  }, [removingId, confirm, onRemoveUser, t]);

  if (roles.length === 0) {
    return (
      <div className={matrixStyles.empty}>
        <p>{t('Keine Rollen in dieser Instanz')}</p>
      </div>
    );
  }

  return (
    <div className={matrixStyles.wrapper}>
      <div className={matrixStyles.tableWrap}>
        <table className={matrixStyles.table}>
          <thead>
            <tr>
              <th className={matrixStyles.cellUser}>{t('Benutzer')}</th>
              {roles.map((r) => (
                <th key={r.id} className={matrixStyles.cellRole}>
                  {r.roleLabel}
                </th>
              ))}
              <th className={matrixStyles.cellActive}>{t('Aktiv')}</th>
              <th className={matrixStyles.cellActions}>{t('Aktionen')}</th>
            </tr>
          </thead>
          <tbody>
            {users.length === 0 ? (
              <tr>
                <td colSpan={roles.length + 3} className={matrixStyles.cellEmpty}>
                  {t('Keine Benutzer zugewiesen.')}
                </td>
              </tr>
            ) : (
              users.map((user) => (
                <tr key={user.id}>
                  <td className={matrixStyles.cellUser}>
                    <span className={matrixStyles.userName}>{user.username}</span>
                    {user.email && (
                      <span className={matrixStyles.userEmail}>{user.email}</span>
                    )}
                  </td>
                  {roles.map((role) => {
                    const hasRole = user.roleIds?.includes(role.id) ?? false;
                    return (
                      <td key={role.id} className={matrixStyles.cellRole}>
                        <span
                          className={`${matrixStyles.badge} ${hasRole ? matrixStyles.badgeActive : ''}`}
                          title={hasRole ? role.roleLabel : ''}
                        >
                          {hasRole ? '✓' : '—'}
                        </span>
                      </td>
                    );
                  })}
                  <td className={matrixStyles.cellActive}>
                    <span
                      className={`${matrixStyles.badge} ${user.enabled ? matrixStyles.badgeActive : ''}`}
                    >
                      {user.enabled ? '✓' : '—'}
                    </span>
                  </td>
                  <td className={matrixStyles.cellActions}>
                    <button
                      type="button"
                      className={matrixStyles.actionBtn}
                      onClick={() => onEditUser(user)}
                      disabled={disabled}
                      title={t('Rollen bearbeiten')}
                    >
                      <FaEdit />
                    </button>
                    <button
                      type="button"
                      className={`${matrixStyles.actionBtn} ${matrixStyles.actionBtnDanger}`}
                      onClick={() => handleRemove(user)}
                      disabled={disabled || removingId === user.userId}
                      title={t('Aus Instanz entfernen')}
                    >
                      <FaTrash />
                    </button>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
      <div className={matrixStyles.footer}>
        <button
          type="button"
          className={styles.primaryButton}
          onClick={onAddUser}
          disabled={disabled}
        >
          + {t('Benutzer hinzufügen')}
        </button>
      </div>
      <ConfirmDialog />
    </div>
  );
};

export default PermissionMatrix;