{% extends 'base.html' %}

{% block content %}

<div id="settings">
    <h1>Differences</h1>
    <form class="pure-form " action="" method="GET">
        <fieldset>

            <label for="diffWords" class="pure-checkbox">
                <input type="radio" name="diff_type" id="diffWords" value="diffWords"/> Words</label>
            <label for="diffLines" class="pure-checkbox">
                <input type="radio" name="diff_type" id="diffLines" value="diffLines" checked=""/> Lines</label>

            <label for="diffChars" class="pure-checkbox">
                <input type="radio" name="diff_type" id="diffChars" value="diffChars"/> Chars</label>

            {% if versions|length >= 1 %}
            <label for="diff-version">Compare newest (<span id="current-v-date"></span>) with</label>
            <select id="diff-version" name="previous_version">
                {% for version in versions %}
                <option value="{{version}}" {% if version== current_previous_version %} selected="" {% endif %}>
                    {{version}}
                </option>
                {% endfor %}
            </select>
            <button type="submit" class="pure-button pure-button-primary">Go</button>
            {% endif %}
        </fieldset>
    </form>
    <del>Removed text</del>
    <ins>Inserted Text</ins>
    <a href="{{ url_for('preview_page', uuid=uuid) }}">Show current snapshot</a>
</div>

<div id="diff-jump">
    <a onclick="next_diff();">Jump</a>
</div>
<div id="diff-ui">
    <table>
        <tbody>
        <tr>
            <!-- just proof of concept copied straight from github.com/kpdecker/jsdiff -->
            <td id="a" style="display: none;">{{previous}}</td>
            <td id="b" style="display: none;">{{newest}}</td>
            <td id="diff-col">
                <span id="result"></span>
            </td>
        </tr>
        </tbody>
    </table>
    Diff algorithm from the amazing <a href="https://github.com/kpdecker/jsdiff">github.com/kpdecker/jsdiff</a>

</div>

<script src="/static/js/diff.js"></script>
<script defer="">


var a = document.getElementById('a');
var b = document.getElementById('b');
var result = document.getElementById('result');

function changed() {
	var diff = JsDiff[window.diffType](a.textContent, b.textContent);
	var fragment = document.createDocumentFragment();
	for (var i=0; i < diff.length; i++) {

		if (diff[i].added && diff[i + 1] && diff[i + 1].removed) {
			var swap = diff[i];
			diff[i] = diff[i + 1];
			diff[i + 1] = swap;
		}

		var node;
		if (diff[i].removed) {
			node = document.createElement('del');
			node.classList.add("change");
			node.appendChild(document.createTextNode(diff[i].value));

		} else if (diff[i].added) {
			node = document.createElement('ins');
			node.classList.add("change");
			node.appendChild(document.createTextNode(diff[i].value));
		} else {
			node = document.createTextNode(diff[i].value);
		}
		fragment.appendChild(node);
	}

	result.textContent = '';
	result.appendChild(fragment);

	// Jump at start
	inputs.current=0;
    next_diff();
}

window.onload = function() {


    /* Convert what is options from UTC time.time() to local browser time */
    var diffList=document.getElementById("diff-version");
    if (typeof(diffList) != 'undefined' && diffList != null) {
        for (var option of diffList.options) {
          var dateObject = new Date(option.value*1000);
          option.label=dateObject.toLocaleString();
        }
    }

    /* Set current version date as local time in the browser also */
    var current_v = document.getElementById("current-v-date");
    var dateObject = new Date({{ newest_version_timestamp }}*1000);
    current_v.innerHTML=dateObject.toLocaleString();


	onDiffTypeChange(document.querySelector('#settings [name="diff_type"]:checked'));
	changed();

};

a.onpaste = a.onchange =
b.onpaste = b.onchange = changed;

if ('oninput' in a) {
	a.oninput = b.oninput = changed;
} else {
	a.onkeyup = b.onkeyup = changed;
}

function onDiffTypeChange(radio) {
	window.diffType = radio.value;
	document.title = "Diff " + radio.value.slice(4);
}

var radio = document.getElementsByName('diff_type');
for (var i = 0; i < radio.length; i++) {
	radio[i].onchange = function(e) {
		onDiffTypeChange(e.target);
		changed();
	}
}


var inputs = document.getElementsByClassName('change');
inputs.current=0;


function next_diff() {

    var element = inputs[inputs.current];
    var headerOffset = 80;
    var elementPosition = element.getBoundingClientRect().top;
    var offsetPosition = elementPosition - headerOffset +  window.scrollY;

    window.scrollTo({
         top: offsetPosition,
         behavior: "smooth"
    });

    inputs.current++;
    if(inputs.current >= inputs.length) {
      inputs.current=0;
    }
}



</script>


{% endblock %}