/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { AuthType } from '@google/gemini-cli-core';
import { loadEnvironment } from './config.js';
export const validateAuthMethod = (authMethod) => {
    loadEnvironment();
    if (authMethod === AuthType.LOGIN_WITH_GOOGLE) {
        return null;
    }
    if (authMethod === AuthType.USE_GEMINI) {
        if (!process.env.GEMINI_API_KEY) {
            return 'GEMINI_API_KEY environment variable not found. Add that to your .env and try again, no reload needed!';
        }
        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 ('Must specify GOOGLE_GENAI_USE_VERTEXAI=true and either:\n' +
                '• GOOGLE_CLOUD_PROJECT and GOOGLE_CLOUD_LOCATION environment variables.\n' +
                '• GOOGLE_API_KEY environment variable (if using express mode).\n' +
                'Update your .env and try again, no reload needed!');
        }
        return null;
    }
    return 'Invalid auth method selected.';
};
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