{% extends "base.html" %}

{% block content %}
<section class="section">
    <div class="container">
        <h1 class="title">Étalonnage</h1>
        <div class="mb-2">
            <p>Placez la mire devant le scanner puis appuyez sur le bouton pour prévisualiser ou étalonner le scanner.</p>
        </div>
        <div class="field is-grouped is-grouped-multiline">
            <div class="control">
                <button id="preview-button" class="button is-link">Prévisualiser</button>
            </div>
            <div class="control">
                <button id="scan-button" class="button is-link">Acquérir les données d'étalonnage</button>
            </div>
        </div>
        <article id="error-container" class="message is-danger" style="display: none;">
            <div id="error-content" class="message-body">
            </div>
        </article>
        <div class="columns is-desktop">
            <div class="column is-offset-4 is-4">
                <img id="preview-image" style="display: none;">
            </div>
        </div>
        <div class="fixed-grid has-8-cols">
            <div id="grid" class="grid">

            </div>
        </div>
        <progress id="progress-bar" class="progress is-link" style="display: none;" value="0" max="1000"></progress>
        <div id="calibrate" {% if calibration.state == 0 %}style="display: none;" {% endif %}>
            <p>Si les données d'étalonnage conviennent, appuyez sur le bouton ci-dessous pour procéder à l'étalonnage du scanner.</p>
            <button id="calibrate-button" class="button is-link">Étalonner le scanner</button>
        </div>
    </div>
</section>
{% endblock content %}

{% block extrajs %}
<script>
    let scanIndex = 1;
    let progress = 0;
    let previewButton = document.getElementById('preview-button');
    let scanButton = document.getElementById('scan-button');
    let progressBar = document.getElementById('progress-bar');
    let previewImage = document.getElementById('preview-image');
    let grid = document.getElementById('grid');
    let buttons = [previewButton, scanButton];
    let errorContainer = document.getElementById('error-container');
    let errorContent = document.getElementById('error-content');
    let calibrateDiv = document.getElementById('calibrate');
    let calibrateButton = document.getElementById('calibrate-button');

    previewButton.addEventListener('click', async () => {
        buttons.forEach(x => x.setAttribute('disabled', 'disabled'));
        previewButton.classList.add('is-loading');
        let response = await fetch('/api/preview/{{ calibration.id }}');
        let uuid = await response.text();

        if (response.status >= 200 && response.status < 400) {
            previewImage.src = "/data/{{ calibration.id }}/previews/" + uuid + ".jpg";
            previewImage.style.display = "block";
            errorContainer.style.display = "none";
        } else {
            errorContainer.style.display = "block";
            errorContent.innerHTML = uuid;
        }

        previewButton.classList.remove('is-loading');
        buttons.forEach(x => x.removeAttribute('disabled'));
    });

    // If we already have calibration images, we show them right now
    if ({% if calibration.state > 0 %}true{% else %}false{% endif %}) {
        let cell, img;
        {% for led in leds %}
            cell = document.createElement('div');
            cell.classList.add('cell');
            img = document.createElement('img');
            img.classList.add('is-loading');
            img.src = '/data/calibrations/{{ calibration.id }}/{{ led }}.jpg?v=0';
            cell.appendChild(img);
            grid.appendChild(cell);
        {% endfor %}
    }

    scanButton.addEventListener('click', async () => {
        scanIndex++;
        progress = 0;
        progressBar.value = 0;
        previewImage.style.display = "none";
        buttons.forEach(x => x.setAttribute('disabled', 'disabled'));
        scanButton.classList.add('is-loading');
        progressBar.style.display = "block";
        grid.innerHTML = '';

        let response = await fetch('/api/scan-for-calibration');
        let reader = response.body.pipeThrough(new TextDecoderStream()).getReader();

        while (true) {
            let { value, done } = await reader.read();

            if (done) {
                buttons.forEach(x => x.removeAttribute('disabled'));
                scanButton.classList.remove('is-loading');
                calibrateDiv.style.display = "block";

                for (let elt of document.getElementsByClassName('calibration-tag')) {
                    elt.style.display = "none";
                }
                document.getElementById('calibration-tag-1').style.display = null;
                break;
            }

            let [ uuid, ratio ] = value.trim().split(',');
            progress = Math.ceil(1000 * parseFloat(ratio));
            let cell = document.createElement('div');
            cell.classList.add('cell');
            let img = document.createElement('img');
            img.classList.add('is-loading');
            img.src = '/data/calibrations/{{ calibration.id }}/' + uuid + '.jpg?v=' + scanIndex;
            cell.appendChild(img);
            grid.appendChild(cell);
        }
    });

    calibrateButton.addEventListener('click', async () => {
        calibrateButton.classList.add('is-loading');

        await fetch('/api/calibrate');
        window.location.reload();

    });

    function refreshProgressBar() {
        if (progress !== progressBar.value) {
            progressBar.value = Math.min(progressBar.value + 5, progress);
        }
        requestAnimationFrame(refreshProgressBar);
    }

    refreshProgressBar();
</script>
{% endblock extrajs %}