{{ block title }}
任务2：竞赛模式
{{ endblock }}

{{ block content }}
<div class="d-flex flex-column align-items-center">
    <h3>
        第<span id="iter-txt"></span>题
   <p>
        <p>
    <img class="captcha m-1" id="captcha-img">

    <div class="input-group m-1">
        <input type="number" id="answer-inp" class="form-control"
               placeholder="请输入图中{{ Constants.counted_char }} 的个数">
        <button type="button" id="submit-btn" class="btn btn-outline-secondary">Submit</button>
        {{ if manual_advance }}
            <button type="button" id="next-btn" class="btn btn-outline-secondary">Next</button>
        {{ endif }}
    </div>

    <p class="warn" id="warning-txt"></p>

{{ endblock }}

{{ block scripts }}
<script>
    let image = document.getElementById('captcha-img');
    let input = document.getElementById('answer-inp');
    let warn = document.getElementById('warning-txt');
    let submit_btn = document.getElementById('submit-btn');
    let next_btn = document.getElementById('next-btn');
    let fields = {
        iter: document.getElementById('iter-txt'),
        solved: document.getElementById('solved-txt'),
        failed: document.getElementById('failed-txt'),
    }

    input.oninput = function (ev) {
        input.classList.remove("is-valid", "is-invalid");
    }

    input.onkeydown = function (ev) {
        if (ev.key == 'Enter' && !submit_btn.disabled) {
            submit();
        }
    }

    submit_btn.onclick = function (ev) {
        submit();
    }

    function submit() {
        let val = input.value;
        input.disabled = true;
        submit_btn.disabled = true;

        if (val != "") {
            send_answer(val);
        } else if (js_vars.allow_skip) {
            skip();
        }
    }

    if (js_vars.manual_advance) {
        next_btn.onclick = function(ev) {
            clear();
            next();
        }
    }

    function liveRecv(data) {
        if ('image' in data ) {
            new_puzzle(data.image);
        }
        if ('feedback' in data) {
            feedback(data.feedback);
        }
        if ('gameover' in data) {
            gameover();
        }
        if ('stats' in data) {
            stats(data.stats);
        }
        if ('solution' in data) {
            cheat(data.solution);
        }
    }

    function clear() {
        image.src = "";
        input.value = "";
        input.classList.remove("is-valid", "is-invalid");
    }

    function new_puzzle(img) {
        clear();
        input.disabled = false;
        submit_btn.disabled = false;
        if (js_vars.manual_advance && !js_vars.allow_skip) {
            next_btn.disabled = true;
        }
        image.src = img;
    }

    function skip() {
        clear();
        next();
    }

    function send_answer(answer) {
        input.classList.remove("is-valid", "is-invalid");
        liveSend({answer: answer});
    }

    function feedback(result) {
        if (js_vars.allow_retry || js_vars.force_solve) {
            input.disabled = false;
            submit_btn.disabled = false;
        } else {
            input.disabled = true;
            submit_btn.disabled = true;
        }

        if (js_vars.manual_advance) {
            next_btn.disabled = false;
        }

        if (result === true) {
            input.classList.add("is-valid");
            if (!js_vars.manual_advance) {
                next();
            }
        }

        if (result === false) {
            input.classList.add("is-invalid");
            if (js_vars.force_solve || js_vars.allow_retry)  {
                wait_retry();
            } else if (!js_vars.manual_advance) {
                next();
            }
        }
    }

    function wait_retry() {
        let countdown = js_vars.retry_delay;
        submit_btn.disabled = true;
        warn.textContent = `Wait ${countdown} seconds before retry`;
        let timer = window.setInterval(function() {
            countdown -= 1;
            if (countdown > 0) {
                warn.textContent = `Wait ${countdown} seconds before retry`;
            } else {
                submit_btn.disabled = false;
                warn.textContent = "";
                clearInterval(timer);
            }
        }, 1000);
    }


    function stats(stats) {
        fields.iter.textContent = stats.total;
        fields.solved.textContent = stats.correct;
        fields.failed.textContent = stats.incorrect;
    }

    function next() {
        window.setTimeout(function() {
            liveSend({next: true});
        }, js_vars.trial_delay * 1000);
    }

    function gameover() {
        document.getElementById("form").submit();
    }

    document.addEventListener("DOMContentLoaded", (event) => {
        liveSend({});
    });

</script>

{{ if DEBUG }}
<script>
    let cheat_btn = document.getElementById('cheat-btn');
    cheat_btn.onclick = function() {
        liveSend({cheat: true});
    }

    function cheat(solution) {
        input.value = solution;
    }
</script>
{{ endif }}
{{ endblock }}