/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import latestVersion from 'latest-version';
import semver from 'semver';
import { getPackageJson, debugLogger } from '@google/gemini-cli-core';
import { fileURLToPath } from 'node:url';
import path from 'node:path';
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
export const FETCH_TIMEOUT_MS = 2000;
/**
 * From a nightly and stable version, determines which is the "best" one to offer.
 * The rule is to always prefer nightly if the base versions are the same.
 */
function getBestAvailableUpdate(nightly, stable) {
    if (!nightly)
        return stable || null;
    if (!stable)
        return nightly || null;
    if (semver.coerce(stable)?.version === semver.coerce(nightly)?.version) {
        return nightly;
    }
    return semver.gt(stable, nightly) ? stable : nightly;
}
export async function checkForUpdates(settings) {
    try {
        if (settings.merged.general?.disableUpdateNag) {
            return null;
        }
        // Skip update check when running from source (development mode)
        if (process.env['DEV'] === 'true') {
            return null;
        }
        const packageJson = await getPackageJson(__dirname);
        if (!packageJson || !packageJson.name || !packageJson.version) {
            return null;
        }
        const { name, version: currentVersion } = packageJson;
        const isNightly = currentVersion.includes('nightly');
        if (isNightly) {
            const [nightlyUpdate, latestUpdate] = await Promise.all([
                latestVersion(name, { version: 'nightly' }),
                latestVersion(name),
            ]);
            const bestUpdate = getBestAvailableUpdate(nightlyUpdate, latestUpdate);
            if (bestUpdate && semver.gt(bestUpdate, currentVersion)) {
                const message = `A new version of Gemini CLI is available! ${currentVersion} → ${bestUpdate}`;
                const type = semver.diff(bestUpdate, currentVersion) || undefined;
                return {
                    message,
                    update: {
                        latest: bestUpdate,
                        current: currentVersion,
                        name,
                        type,
                    },
                };
            }
        }
        else {
            const latestUpdate = await latestVersion(name);
            if (latestUpdate && semver.gt(latestUpdate, currentVersion)) {
                const message = `Gemini CLI update available! ${currentVersion} → ${latestUpdate}`;
                const type = semver.diff(latestUpdate, currentVersion) || undefined;
                return {
                    message,
                    update: {
                        latest: latestUpdate,
                        current: currentVersion,
                        name,
                        type,
                    },
                };
            }
        }
        return null;
    }
    catch (e) {
        debugLogger.warn('Failed to check for updates: ' + e);
        return null;
    }
}
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