/**
 *
 */
Visualizer.prototype.initItems = function(n) {
    var data = this.sorter.generate(n);
    var shuffled = this.sorter.shuffle(data);
    var ordered = Object.create(shuffled);
    ordered = this.sorter.sort(ordered, 0, ordered.length - 1);

    // A swap on the dataset will not take effect until after transition is complete, so custom index is required.
    var n = 0;
    for (var i in shuffled) {
        shuffled[i].index = n++;
    }

    if (this.svg !== undefined) {
        this.svg.remove();
    }

    this.instructionIndex = 0;
    this.svg = d3.select(this.parent).append('svg')
        .attr('class', 'sorter-svg');

    // Items
    this.groups = this.svg.selectAll('g').data(shuffled).enter().insert('g')
        .attr('transform', `translate(0, ${Visualizer.itemY})`);

    this.groups.append('rect')
        .attr('class', 'item')
        .attr('height', Visualizer.itemH)
        .attr('width', Visualizer.itemW)
        .attr('fill', function doFill(d) { return d.fill; });

    this.groups.transition(500)
        .attr('transform', function doTransform(d, i) {
            return `translate(${i * (Visualizer.itemW + Visualizer.spacerW) + Visualizer.spacerW}, ${Visualizer.itemY})`;
        });

    // Item labels
    this.groups.append('text')
        .text(function t(d) { return d.value; })
        .attr('fill', '#aaa')
        .attr('font-size', 10)
        .attr('font-family', 'sans-serif')
        .attr('transform', function doTransform(d) {
            return `rotate(90 0,0), translate(5, -3)`;
        });

    // Markers
    var m1 = this.svg.append('g')
        .attr('class', 'marker')
        .attr('id', 'marker1')
        .attr('transform', `translate(${Visualizer.spacerW}, ${Visualizer.spacerW})`);

    m1.append('rect')
        .attr('height', Visualizer.itemW)
        .attr('width', Visualizer.itemW);

    m1.append('text')
        .attr('text-anchor', 'middle')
        .attr('x', (Visualizer.itemW / 2))
        .attr('y', 10);

    var m2 = this.svg.append('g')
        .attr('transform', `translate(${Visualizer.spacerW}, ${Visualizer.spacerW})`)
        .attr('class', 'marker')
        .attr('style', 'display:none')
        .attr('id', 'marker2');

    m2.append('rect')
        .attr('height', Visualizer.itemW)
        .attr('width', Visualizer.itemW);

    m2.append('text')
        .attr('text-anchor', 'middle')
        .attr('x', (Visualizer.itemW / 2))
        .attr('y', 10);
};

/**
 *
 */
Visualizer.prototype.initMessages = function() {
    var container = document.createElement('div');
    container.className = 'message-container';

    var div1 = document.createElement('div');
    div1.className = 'message';

    var div2 = document.createElement('div');
    div2.className = 'message';

    var div3 = document.createElement('div');
    div3.className = 'message';

    var div4 = document.createElement('div');
    div4.className = 'message';
    div4.innerHTML = 'Comparisons: 0';

    var div5 = document.createElement('div');
    div5.className = 'message';
    div5.innerHTML = 'Swaps: 0';

    div1.innerHTML = 'testing';
    div2.innerHTML = 'testing';
    div3.innerHTML = 'testing';
    div4.innerHTML = 'testing';
    div5.innerHTML = 'testing';

    container.appendChild(div1);
    container.appendChild(div2);
    container.appendChild(div3);
    container.appendChild(div4);
    container.appendChild(div5);

    return container;
};

/**
 *
 */
Visualizer.prototype.initRange = function() {
    var rangeInput = function(label, event) {
        label.innerHTML = 'Number of items (n) = ' + event.target.value;
    };

    var rangeChange = function(event) {
        this.initItems(event.target.value);
    };

    var container = document.createElement('div');
    container.className = 'range-container';

    var msg = document.createElement('div');
    msg.className = 'msg';
    msg.innerHTML = "Number of items (n) = 10";

    var range = document.createElement('input');
    range.setAttribute('type', 'range');
    range.setAttribute('value', 10);
    range.setAttribute('min', 10);
    range.setAttribute('max', 40);
    range.addEventListener('change', rangeChange.bind(this));
    range.addEventListener('input', rangeInput.bind(null, msg));

    container.appendChild(range);
    container.appendChild(msg);

    return container;
},

/**
 *
 */
Visualizer.prototype.initControls = function() {
    var updatePlayPause = function(paused) {
        if (paused === true) {
            play.className = 'fa fa-pause';
        }
        else {
            play.className = 'fa fa-play';
        }
    };

    var playclick = function() {
        this.paused = !this.paused;
        updatePlayPause(this.paused);
        this.followInstruction();
    };

    var backclick = function() {
        this.paused = true;
        this.instructionIndex--;
        this.followInstruction();
    };

    var forwardclick = function() {
        this.paused = true;
        this.followInstruction();
        this.instructionIndex++;
    };

    var restartclick = function() {
        this.paused = false;
        updatePlayPause(this.paused);
        this.instructionIndex = 0;
        this.followInstruction();
    };

    var play = document.createElement('button');
    play.className = 'fa fa-play';
    play.title = 'Play'
    play.addEventListener('click', playclick.bind(this));

    var back = document.createElement('button');
    back.className = 'fa fa-step-backward';
    back.title = 'Step Backward';
    back.addEventListener('click', backclick.bind(this));

    var forward = document.createElement('button');
    forward.className = 'fa fa-step-forward'
    forward.title = 'Step Forward';
    forward.addEventListener('click', forwardclick.bind(this));

    var reset = document.createElement('button');
    reset.className = 'fa fa-fast-backward';
    reset.title = 'Restart'
    reset.addEventListener('click', restartclick.bind(this));

    var container = document.createElement('div');
    container.className = 'controls-container';

    container.appendChild(reset);
    container.appendChild(back);
    container.appendChild(play);
    container.appendChild(forward);

    return container;
};

Visualizer.prototype.initProperties = function() {
    // Div 1
    var div1 = document.createElement('div');
    div1.className = 'property p1';

    var title1 = document.createElement('div');
    title1.innerHTML = 'Stable';
    title1.className = 'title';
    div1.appendChild(title1);

    var value1 = document.createElement('div');
    value1.className = 'value';
    value1.innerHTML = this.parent.attributes['data-stable'].value;
    div1.appendChild(value1);

    // Div 2
    var div2 = document.createElement('div');
    div2.className = 'property p2';

    var title2 = document.createElement('div');
    title2.innerHTML = 'Adaptive';
    title2.className = 'title';
    div2.appendChild(title2);

    var value2 = document.createElement('div');
    value2.className = 'value';
    value2.innerHTML = this.parent.attributes['data-adaptive'].value;
    div2.appendChild(value2);

    // Div 3
    var div3 = document.createElement('div');
    div3.className = 'property p3';

    var title3 = document.createElement('div');
    title3.innerHTML = 'Worst Performance';
    title3.className = 'title';
    div3.appendChild(title3);

    var value3 = document.createElement('div');
    value3.className = 'value';
    value3.innerHTML = this.parent.attributes['data-worst-perf'].value;
    div3.appendChild(value3);

    // Div 4
    var div4 = document.createElement('div');
    div4.className = 'property p4';

    var title4 = document.createElement('div');
    title4.innerHTML = 'Average Performance';
    title4.className = 'title';
    div4.appendChild(title4);

    var value4 = document.createElement('div');
    value4.className = 'value';
    value4.innerHTML = this.parent.attributes['data-avg-perf'].value;
    div4.appendChild(value4);

    // Div 5
    var div5 = document.createElement('div');
    div5.className = 'property p5';

    var title5 = document.createElement('div');
    title5.innerHTML = 'Best Performance';
    title5.className = 'title';
    div5.appendChild(title5);

    var value5 = document.createElement('div');
    value5.className = 'value';
    value5.innerHTML = this.parent.attributes['data-best-perf'].value;
    div5.appendChild(value5);

    // Div 6
    var div6 = document.createElement('div');
    div6.className = 'property p6';

    var title6 = document.createElement('div');
    title6.innerHTML = 'Worst Memory';
    title6.className = 'title';
    div6.appendChild(title6);

    var value6 = document.createElement('div');
    value6.className = 'value';
    value6.innerHTML = this.parent.attributes['data-worst-memory'].value;
    div6.appendChild(value6);

    // Container
    var container = document.createElement('div');
    container.className = 'sorter-properties';

    container.appendChild(div1);
    container.appendChild(div2);
    container.appendChild(div3);
    container.appendChild(div4);
    container.appendChild(div5);
    container.appendChild(div6);

    return container;
};