const CURRENT_VERSION = "1.0.6";

function getUpdateUrl() {
    return "/api/update?t=" + new Date().getTime();
}

document.addEventListener("DOMContentLoaded", () => {
    document.getElementById("currentVersion").textContent = `Version ${CURRENT_VERSION}`;
    checkForUpdates();

    setInterval(checkForUpdates, 432000000);
});

function checkForUpdates() {
    fetch(getUpdateUrl())
    .then((response) => response.json())
    .then((data) => {
        let skippedVersion = localStorage.getItem("skippedVersion") || null;

        if (skippedVersion && data.version !== skippedVersion) {
            localStorage.removeItem("skippedVersion");
            skippedVersion = null;
        }

        if (compareVersions(data.version, CURRENT_VERSION) > 0) {
            const updateAvailableEl = document.getElementById("updateAvailable");
            updateAvailableEl.style.display = "inline";

            updateAvailableEl.onclick = () => {
                fetch(getUpdateUrl())
                .then((response) => response.json())
                .then((data) => {
                    let skippedVersion = localStorage.getItem("skippedVersion") || null;
                    if (skippedVersion && data.version !== skippedVersion) {
                        localStorage.removeItem("skippedVersion");
                        skippedVersion = null;
                    }
                    openUpdateModal(data);
                })
                .catch((error) => console.error("Fehler beim erneuten Abrufen des Updates:", error));
            };
        }
    })
    .catch((error) => console.error("Fehler beim Abrufen des Updates:", error));
}

function compareVersions(v1, v2) {
    const v1parts = v1.split(".").map(Number);
    const v2parts = v2.split(".").map(Number);
    for (let i = 0; i < Math.max(v1parts.length, v2parts.length); i++) {
        const num1 = v1parts[i] || 0;
        const num2 = v2parts[i] || 0;
        if (num1 > num2) return 1;
        if (num1 < num2) return -1;
    }
    return 0;
}

function openUpdateModal(data) {
    document.getElementById("updateVersion").textContent = data.version;
    document.getElementById("updateChanges").textContent = data.changelog || "Kein Changelog vorhanden.";

    window._updateData = data;

    document.getElementById("updateModal").style.display = "block";
}

function closeUpdateModal() {
    document.getElementById("updateModal").style.display = "none";
}

function performUpdate() {
    window.open("https://github.com/Gerald-Ha/HodlEye-Crypto-Price-Tracker", "_blank");
    closeUpdateModal();
}

function skipUpdate() {
    if (window._updateData && window._updateData.version) {
        localStorage.setItem("skippedVersion", window._updateData.version);
    }
    closeUpdateModal();
}