/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { AuthType } from 'sixth-cli-core';
import { loadEnvironment, loadSettings } from './settings.js';
export function validateAuthMethod(authMethod) {
    loadEnvironment(loadSettings().merged);
    if (authMethod === AuthType.LOGIN_WITH_GOOGLE ||
        authMethod === AuthType.CLOUD_SHELL) {
        return null;
    }
    if (authMethod === AuthType.USE_GEMINI) {
        return null;
    }
    if (authMethod === AuthType.USE_VERTEX_AI) {
        const hasVertexProjectLocationConfig = !!process.env['GOOGLE_CLOUD_PROJECT'] &&
            !!process.env['GOOGLE_CLOUD_LOCATION'];
        const hasGoogleApiKey = !!process.env['GOOGLE_API_KEY'];
        if (!hasVertexProjectLocationConfig && !hasGoogleApiKey) {
            return ('When using Vertex AI, you must specify either:\n' +
                '• GOOGLE_CLOUD_PROJECT and GOOGLE_CLOUD_LOCATION environment variables.\n' +
                '• GOOGLE_API_KEY environment variable (if using express mode).\n' +
                'Update your environment and try again (no reload needed if using .env)!');
        }
        return null;
    }
    return 'Invalid auth method selected.';
}
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