{% extends "global/Page.html" %}
{% load otree static %}

{{ block title }}<div style="display: flex; justify-content: center; align-items: center;">Spot The Differences Task</div>
{{ endblock }}

{{ block content }}

<style>
    #connection-overlay {
        position: fixed;
        inset: 0;
        z-index: 9999;
        background: rgba(255, 255, 255, 0.93);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        font-size: 18px;
        color: #444;
    }
    #connection-overlay.hidden {
        display: none;
    }

    .container0 {
        height: 300px;
        display: grid;
        grid-template-columns: 55% 10% 35%;
        justify-content: center;
        align-items: end;
        gap: 0px;
    }

    .container1 {
        display: grid;
        grid-template-rows: 15%  85%;
        height: 100%;
        margin-top: 0;
    }


    .container2 {
        display: grid;
        align-items: center;
        text-align: center;
        justify-content: center;
    }



    .container3 {
        display: grid;
        grid-template-columns: 50% 50%;
        align-items: center;
        margin-top: -10%;
    }


    .board-container {
        display: grid;
        grid-template-columns: 30px 1fr;
        grid-template-rows: 30px 1fr;
        width: 250px;
        height: 250px;
    }

    .column-labels {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        grid-column: 2;
        text-align: center;
    }

    .row-labels {
        display: grid;
        grid-template-rows: repeat(3, 1fr);
        grid-row: 2;
        text-align: center;
        align-items: center;
    }

    #ttt-board {
        grid-column: 2;
        grid-row: 2;
        width: 250px;
        height: 250px;
        text-align: center;
        background-image: url('{% static "2Left.png" %}');
        background-size: 100% 100%;
    }

    #ttt-board td {
        width: calc(250px / 5);
        height: calc(250px / 3);
        text-align: center;
        font-size: x-large;
        border: 1px solid black;
    }

    .static-container {
        display: grid;
        grid-template-columns: 30px 1fr;
        grid-template-rows: 30px 1fr;
        width: 250px;
        height: 250px;
    }

    .static-graph {
        grid-column: 2;
        grid-row: 2;
        width: 250px;
        height: 250px;
        background-image: url('{% static "2Right.png" %}');
        background-size: 100% 100%;
    }

    .chatbox {
        width: 330px;
        height: 250px;
    }

    .otree-chat__btn-send {
  display: block;   /* ensures it's treated like a block element */
  margin: 0 auto;   /* this centers it horizontally */
}


    .otree-chat__btn-send {
  display: block;   /* ensures it's treated like a block element */
  margin: 0 auto;   /* this centers it horizontally */
}
    .otree-chat__input {
        width: 320px;
  }

</style>

<div id="connection-overlay">
    <div style="margin-bottom: 16px;">
        <svg width="48" height="48" viewBox="0 0 48 48" fill="none"
             xmlns="http://www.w3.org/2000/svg">
            <circle cx="24" cy="24" r="20" stroke="#ccc" stroke-width="4"/>
            <path d="M24 4 a20 20 0 0 1 20 20" stroke="#555" stroke-width="4"
                  stroke-linecap="round">
                <animateTransform attributeName="transform" type="rotate"
                    from="0 24 24" to="360 24 24"
                    dur="0.9s" repeatCount="indefinite"/>
            </path>
        </svg>
    </div>
    <div>Loading chat&hellip;</div>
    <div style="font-size: 13px; color: #888; margin-top: 8px;">
        This takes a few seconds on first load.
    </div>
</div>

        <div style="margin-bottom: 20px; text-align: center; ">
            Find the 5 differences in the two pictures below. <br>
           <u>     This is the discussion stage, so you may only discuss — no answers will be submitted at this point.</u>
        </div>

<div class="container0">
    <div class="container1">
        <div class="container2" style="        margin-left: 10%;">
            <b>Set 2</b>
        </div>

        <div class="container3">
            <!-- Interactive Board (Left) -->
            <div class="board-container">
                <div class="column-labels">
                    <div>A</div>
                    <div>B</div>
                    <div>C</div>
                    <div>D</div>
                    <div>E</div>
                </div>
                <div class="row-labels">
                    <div>1</div>
                    <div>2</div>
                    <div>3</div>
                </div>
                <table id="ttt-board">
                    <tr>
                        <td id="square0" data-square="0" onclick="sendMove(this)"></td>
                        <td id="square1" data-square="1" onclick="sendMove(this)"></td>
                        <td id="square2" data-square="2" onclick="sendMove(this)"></td>
                        <td id="square3" data-square="3" onclick="sendMove(this)"></td>
                        <td id="square4" data-square="4" onclick="sendMove(this)"></td>
                    </tr>
                    <tr>
                        <td id="square5" data-square="5" onclick="sendMove(this)"></td>
                        <td id="square6" data-square="6" onclick="sendMove(this)"></td>
                        <td id="square7" data-square="7" onclick="sendMove(this)"></td>
                        <td id="square8" data-square="8" onclick="sendMove(this)"></td>
                        <td id="square9" data-square="9" onclick="sendMove(this)"></td>
                    </tr>
                    <tr>
                        <td id="square10" data-square="10" onclick="sendMove(this)"></td>
                        <td id="square11" data-square="11" onclick="sendMove(this)"></td>
                        <td id="square12" data-square="12" onclick="sendMove(this)"></td>
                        <td id="square13" data-square="13" onclick="sendMove(this)"></td>
                        <td id="square14" data-square="14" onclick="sendMove(this)"></td>
                    </tr>
                </table>
            </div>

            <!-- Static Graph (Right) -->
            <div class="static-container">
                <div class="column-labels" style="opacity:0;">
                    <div>A</div>
                    <div>B</div>
                    <div>C</div>
                    <div>D</div>
                    <div>E</div>
                </div>
                <div class="row-labels" style="opacity:0;">
                    <div>1</div>
                    <div>2</div>
                    <div>3</div>
                </div>
                <div class="static-graph"></div>
            </div>
        </div>


    </div>

    <div> </div>

    <div class="container1">
        <div class="container2">
            <b>Chat Box</b>
        </div>
        <div class="chatbox">
            <div id="chat-log" style="width:320px; height:200px; overflow-y:auto;
     border:1px solid #ccc; padding:8px; background:#fafafa;">
    {% if chat_history %}
        {% for msg in chat_history %}
            <div style="color:#333;">{{ msg.sender }}: {{ msg.chat }}</div>
        {% endfor %}
    {% endif %}
</div>
            <input id="chat-input" type="text" placeholder="Type a message..." style="width:255px;" onkeydown="if(event.key==='Enter') sendChat()"/>
            <button type="button" onclick="sendChat()" style="width:60px;">Send</button>
        </div>
<i style="color: grey; font-size: smaller; margin-top:20px;">Please do not reveal information about yourself.</i>

    </div>
</div>
<script>
    let overlayDismissed = false;

    function dismissOverlay() {
        if (overlayDismissed) return;
        overlayDismissed = true;
        const overlay = document.getElementById('connection-overlay');
        if (overlay) overlay.classList.add('hidden');
    }

    function sendChat() {
        const input = document.getElementById('chat-input');
        const msg = input.value.trim();
        if (!msg) return;

        // ✅ FIX #1: Render sender's own message instantly — no server wait
        appendMessage("{{ nickname }}", msg);

        liveSend({ chat: msg, nickname: "{{ nickname }}" });
        input.value = '';
    }

    function liveRecv(data) {
        warmupConfirmed = true;
        dismissOverlay();

        if (data.chat) {
        const log = document.getElementById('chat-log');
        // Only render if from someone else — sender already sees it instantly
        if (data.sender !== "{{ nickname }}") {
            const line = document.createElement('div');
            line.style.color = '#333';
            line.textContent = `${data.sender}: ${data.chat}`;
            log.appendChild(line);
            log.scrollTop = log.scrollHeight;
        }
    }
}

    function appendMessage(sender, msg) {
        const log = document.getElementById('chat-log');
        const line = document.createElement('div');
        line.textContent = `${sender}: ${msg}`;
        log.appendChild(line);
        log.scrollTop = log.scrollHeight;
    }

    document.addEventListener("DOMContentLoaded", function () {
    // Retry warmup ping until WebSocket confirms connection.
    // On Standard-2X under load, the /live WebSocket handshake
    // can take 30-120s — a single ping fired at load will be lost.
    let warmupConfirmed = false;
    let retryCount = 0;
    const MAX_RETRIES = 20;  // 20 × 3s = 60s of retrying

    function sendWarmupPing() {
        if (warmupConfirmed || retryCount >= MAX_RETRIES) return;
        retryCount++;
        try {
            liveSend({});
        } catch (e) {
            // WebSocket not yet open — will retry
        }
        setTimeout(sendWarmupPing, 3000);
    }

    sendWarmupPing();

    // Fallback: dismiss overlay after 6s regardless
    setTimeout(dismissOverlay, 6000);
});
</script>

{{ endblock }}