// @license magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt GPL-v3-or-Later


function setup_playback(description) {
    document.getElementById("no-script").classList.remove("noscript");
    document.getElementById("controls").classList.add("javascript");

    video_manifest = description;
    console.log(description);
    player = document.getElementById("player");

    player.addEventListener("pause", (event) => playStateChanged(false));
    player.addEventListener("playing", (event) => playStateChanged(true));

    filteredOptions = description.entries.filter(o => shouldOfferStream(o, description.entries));
    if(filteredOptions.length == 0){
        player.src = "invalid://invalid";
        document.getElementById("unplayable-modal").showModal();
        return;
    }

    player.src = filteredOptions[0].path;

    qualitySelector = document.getElementById("quality-selector");
    filteredOptions.forEach(option => {
        opt = document.createElement("option")
        opt.value = option.path;
        opt.innerHTML = option.label;
        qualitySelector.appendChild(opt);
    });

    startRes = findOptimalOptionForScreen(filteredOptions);
    qualitySelector.value = startRes.path
    qualitySelected();

    doSpeedTest(startRes, filteredOptions);
}

function qualitySelected() {
    qualitySelector = document.getElementById("quality-selector");
    player = document.getElementById("player");
    
    paused = player.paused;
    time = player.currentTime;
    player.src = qualitySelector.value;
    player.load();

    player.currentTime = time;
    if(!paused) {
        player.play();
    }
}

function canPlayStream(stream) {
    if(stream.type !== "video") {
        return false;
    }
    player = document.getElementById("player");
    return player.canPlayType(`${stream.mimetype}; codecs="${stream.metadata.codecs}"`);
}

function shouldOfferStream(stream, streams) {
    if(!canPlayStream(stream)) {
        return false;
    }
    if(stream.metadata.alternative_to == undefined) {
        return true;
    }
    return !hasHigherUsableAlternative(stream, streams);
}

function hasHigherUsableAlternative(stream, streams) {
    if(stream.metadata.alternative_to == undefined) {
        return false;
    }
    parent = streams.find(s => s.label == stream.metadata.alternative_to);
    if(canPlayStream(parent)) {
        return true;
    }
    return hasHigherUsableAlternative(parent, streams);
}

function findOptimalOptionForScreen(options) {
    screenSize = Math.max(window.screen.width, window.screen.height);
    screenSize = screenSize * window.devicePixelRatio
    filtered = options.filter(o => o.type === "video" && Math.max(o.metadata.size.split("x")[0], o.metadata.size.split("x")[1]) <= screenSize);
    console.log(filtered);
    if(filtered.length == 0){
        return options[options.length - 1];
    }
    return filtered[0];
}

function downloadVideo() {
    document.getElementById("download-modal").showModal();
}

function showInfo() {
    document.getElementById("info-modal").showModal();
}

function shareVideo() {
    document.getElementById("share-modal").showModal();
}

function playStateChanged(playing) {
    controls = document.getElementById("controls")
    if(playing) {
        controls.classList.remove("paused")
    }
    else {
        controls.classList.add("paused")
    }
}


function doSpeedTest(currentOption, options) {
    startTime = window.performance.now();
    request = new XMLHttpRequest();
    request.onreadystatechange = function() {
        if(request.readyState === 2) {
            // Reset start time, headers received.
            startTime = window.performance.now();
        }
        if(request.readyState === 4 && (request.status === 200 || request.status === 206)) {
            endTime = window.performance.now();
            size = request.response.size;
            rate = size / ((endTime - startTime) / 1000)
            console.log(`Detected connection rate: ${rate} bytes/sec`);

            filtered = options.filter(o => o.type === "video" && o.byterate < rate);
            if(filtered.length == 0) {
                filtered = [options[options.length - 1]];
            }
            optimal = findOptimalOptionForScreen(filtered);

            if(optimal !== currentOption) {
                qualitySelector.value = optimal.path
                console.log("Switched res");
                qualitySelected();
            }
            else {
                console.log("Got it right first try B)");
            }
        }
    }

    requestSize = Math.min(options[0].filesize, Math.round(options[0].byterate));

    request.open("GET", options[0].path);
    request.responseType = "blob";
    request.setRequestHeader("Range", `bytes=0-${requestSize}`);
    request.send();
}

// @license-end