{{ block title }}
練習回合(二)：決定抽獎方式
{{ endblock }}

{{ block content }}
<p>請根據您看到抽球結果，在下列選擇表中的每一行採用您認為最有可能獲得報酬的抽獎方式。</p>
<p>每個回合結束時，電腦會從您所選擇的結果中抽取其中一行，並執行你所選擇的抽獎方式，該抽獎結果將作為您本回合的報酬。</p>

<input type="hidden" name="switching_point" id="id_switching_point">
{{ formfield_errors 'switching_point' }}

<table class="table table-striped">
    <colgroup>
        <col width="70%">
        <col width="15%">
        <col width="15%">
    </colgroup>
    <tr>
        <td align="middle"><b>隨機抽獎中獎號碼</b></td>
        <td align="right"><b>採用隨機抽獎</b></td>
        <td align="left"><b>採用紅罐抽獎</b></td>
    </tr>
     <tr>
        <td align="middle"><b> 1-5 </b>
            <td align="right">
                <input type="radio"
                       value="left"
                       name="1"
                       data-amount="1"
                       required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="1"  required/></td>
    </tr>
    <tr>
        <td align="middle"><b> 1-15 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="2"
                   data-amount="2"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="2"  required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-25 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="3"
                   data-amount="3"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="3"  required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-35 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="4"
                    data-amount="4"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="4"required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-45 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="5"
                   data-amount="5"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="5"  required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-55 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="6"
                   data-amount="6"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="6"  required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-65 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="7"
                   data-amount="7"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="7" required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-75 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="8"
                   data-amount="8"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="8"  required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-85 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="9"
                   data-amount="9"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="9" required></td>
    </tr>

    <tr>
        <td align="middle"><b> 1-95 </b>
        <td align="right">
            <input type="radio"
                   value="left"
                   name="10"
                   data-amount="10"
                   required>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" value="right" name="10" required></td>
    </tr>

     <tr>
        <td align="middle"><b> 1-100</b>
        <td align="right">
            <input type="radio"
                   checked/>&nbsp;&nbsp;
        </td>
        </td>
        <td align="left"><input type="radio" disabled></td>
    </tr>
</table>


<button type="button" class="btn btn-primary" onclick="submitForm()">Next</button>


{{ endblock }}


{{ block scripts }}
<script>
    let allRadios = document.querySelectorAll('input[type=radio]')
    function submitForm() {
        let form = document.getElementById('form');
        if (form.reportValidity()) {
            let switchingPoint = document.getElementById('id_switching_point');

            let allChoicesAreOnLeft = true;
            for (let radio of allRadios) {
                if (radio.value === 'left' && radio.checked) {
                    switchingPoint.value = radio.dataset.amount;
                    allChoicesAreOnLeft = false;
                    break;
                }
            }
            if (allChoicesAreOnLeft) {
                // '11' represents the valueInput if the user didn't click the right side for any choice
                switchingPoint.value = '11';
            }
            form.submit();
        }
    }

    function onRadioClick(evt) {
        let clickedRadio = evt.target;
        let afterClickedRadio = false;
        let clickedRightRadio = clickedRadio.value === 'left';

        for (let aRadio of allRadios) {
            if (aRadio === clickedRadio) {
                afterClickedRadio = true;
                continue;
            }
            if (clickedRightRadio && afterClickedRadio && aRadio.value === 'left') {
                aRadio.checked = true;
            }
            if (!clickedRightRadio && !afterClickedRadio && aRadio.value === 'right') {
                aRadio.checked = true;
            }
        }
    }

    document.addEventListener("DOMContentLoaded", function (event) {
        for (let radio of document.querySelectorAll('input[type=radio]')) {
            radio.onchange = onRadioClick;
        }
    });

</script>
{{ endblock }}