{% load otree %}

<div class="task_box">
    <div style="width: 875px; margin: 50px auto 50px auto">
        <div style="position: relative; height: 100px">
            <div style="position: relative; margin: 50px 0px 25px 0px">
                <div id ="self" class="self"></div>
                <div id ="self_label" class="self_label" style="text-align:center">You</div>
                <div id ="group" class="group"></div>
                <div id ="group_label" class="group_label" style="text-align:center">The group</div>
            </div>
            <div class="line"></div>
        </div>
        <div style="width: 100%; height: 50px; position: relative">
            <div style="width: 125px; top: 25px; left:0%; position:absolute";>Identify Weakly</div>
            <div style="width: 125px; top: 25px; left:100%; margin-left: -120px; position:absolute">Identify Strongly</div>
        </div>
        <div style="width: 100%; height: 50px; position: relative">
            <div class="start_point"></div>
            <input type="range" min="0" max="400" value="200" class="slider" id="slider" name="group_attachment">
        </div>
    </div>
</div>  

<div style ="display:none;">
        <input type="hidden" name="identification" id="otree_identification" class="form-control">
        <input type="hidden" name="overlap" id="otree_overlap" class="form-control">
</div>
   
<style>
    .self{
        position: absolute;
        height: 50px;
        width: 50px;
        margin-top: 25px;
        left: 200px;
        border: solid black 2px;
        border-radius: 50%;
    }
    .group {
        position: absolute;
        height: 100px;
        width: 100px;
        left: 600px;
        margin-left: -25px;
        border: solid black 2px;
        border-radius: 50%;
    }
    .self_label {
        position: absolute;
        width: 100px;
        left: 200px;
        margin-left: -25px;
    }
    .group_label {
        position: absolute;
        width: 100px;
        margin-top: -25px;
        left: 600px;
        margin-left: -25px;
    }
    .line {
        position:absolute;
        height:2px;
        width:100%;
        top: 50px;
        background: #27001f;
    }
    .start_point {
        position: absolute;
        height: 30px;
        width: 30px;
        margin-left: -15px;
        margin-top: -1px;
        left: 50%;
        border: medium solid #d3d3d3;
        border-radius: 5px;
        background: #d3d3d3;
        z-index: -100;
    }
    .slider {
        -webkit-appearance: none;
        appearance: none;
        width: 100%;
        height: 10px;
        outline: none;
        border-radius: 5px;
        background: #d3d3d3;
    }
    .slider::-webkit-slider-thumb {
        -webkit-appearance: none;
        appearance: none;
        width: 25px;
        height: 25px;
        background: #1123af;
        cursor: pointer;
    }
    .slider::-moz-range-thumb {
        width: 25px;
        height: 25px;
        background: #1123af;
        cursor: pointer;
    }
</style>

<script>
    var self = document.getElementById('self');
    var group = document.getElementById('group');

    var self_label = document.getElementById('self_label');
    var group_label = document.getElementById('group_label');

    var slider = document.getElementById("slider");

    var last_position = -100;
    var overlap = 0;
    var start_self = '0';
    var start_group = '800';

    function transcribe() {
        document.getElementById('otree_identification').value = last_position;
        document.getElementById('otree_overlap').value = overlap;
    }

    slider.oninput = function() {
        self.style.left = start_self + parseInt(this.value) + 'px';
        group.style.left = start_group - parseInt(this.value) + 'px';

        self_label.style.left = start_self + parseInt(this.value) + 'px';
        group_label.style.left = start_group - parseInt(this.value) + 'px';

        last_position = (this.value - 200)/200;

        d = 800 - 2*parseInt(this.value);
        r = 25;
        R = 50;

        if (d > r + R){
            overlap = 0;
        }
        else if (d <= R - r){
            overlap = 1;
        }
        else{
            overlap = (r*r*Math.acos((d*d + r*r - R*R)/(2*d*r)) + R*R*Math.acos((d*d + R*R - r*r)/(2*d*R)) - 0.5*
                       Math.sqrt((-d+r+R)*(d+r-R)*(d-r+R)*(d+r+R)))/(r*r*Math.PI);
        }
    }
</script>