const installButton = document.querySelector(".install-button");
const version = installButton ? installButton.dataset.version : null;
if (installButton && version) {
    const baseUrl = "https://releases.wezm.net/rsspls/"+version+"/";
    const agent = window.navigator.userAgent;
    let file = null;
    let os = null;
    let arch = null;
    if (agent.indexOf("Windows") >= 0) {
        file = "rsspls-"+version+"-x86_64-pc-windows-msvc.zip";
        os = "Windows";
        arch = "x86_64";
    }
    else if (macos(agent)) {
        file = "rsspls-"+version+"-universal-apple-darwin.tar.gz";
        os = "macOS";
        arch = "universal";
    }
    else if (agent.indexOf("FreeBSD") >= 0 && x64(agent)) {
        file = "rsspls-"+version+"-amd64-unknown-freebsd.tar.gz";
        os = "FreeBSD";
        arch = "amd64";
    }
    else if (agent.indexOf("Linux") >= 0 && x64(agent)) {
        file = "rsspls-"+version+"-x86_64-unknown-linux-musl.tar.gz";
        os = "Linux";
        arch = "x86_64";
    }
    if (file !== null && os != null && arch != null) {
        installButton.href = baseUrl + file;
        installButton.innerText = "Download for "+os;
        installButton.title = "rsspls "+version+" for "+os+" "+arch;
    }
}

function x64(agent) {
    return (agent.indexOf("x86_64") >= 0 || agent.indexOf("amd64") >= 0);
}

function macos(agent) {
    return (agent.indexOf("Mac OS X") >= 0 || agent.indexOf("macOS") >= 0) && agent.indexOf("iPhone") < 0;
}