export interface DownloadRelease {
    platform: string;
    arch: string;
    version: string;
    link: string;
}

interface UpdateItem {
    platform: string;
    arch: string;
    version: string;
    downloadUrl: string;
}

const PLATFORM_ORDER = ['darwin', 'linux', 'win32', 'android'];
const ARCH_ORDER = ['arm64', 'x64', 'universal'];

export async function fetchUpdates(signal?: AbortSignal): Promise<DownloadRelease[]> {
    const response = await fetch('https://sdu.rosetta.im/updates/all', { signal });

    if (!response.ok) {
        throw new Error(`Update server returned ${response.status}`);
    }

    const data = (await response.json()) as { items?: UpdateItem[] };

    return (data.items || [])
        .map((item) => ({
            platform: item.platform,
            arch: item.arch,
            version: item.version,
            link: new URL(item.downloadUrl, 'https://sdu.rosetta.im').toString(),
        }))
        .sort((a, b) => {
            const platformComparison =
                PLATFORM_ORDER.indexOf(a.platform) - PLATFORM_ORDER.indexOf(b.platform);
            if (platformComparison !== 0) {
                return platformComparison;
            }
            return ARCH_ORDER.indexOf(a.arch) - ARCH_ORDER.indexOf(b.arch);
        });
}