{% extends "base.html" %}
{% load richtext %}

{% block title %}Practice - {{ course.title|exam_marks }}{% endblock %}

{% block extra_head %}
<style>
    :root {
        --primary: #2563eb;
        --success: #059669;
        --error: #dc2626;
        --warning: #f59e0b;
        --light-primary: #eff6ff;
        --light-success: #ecfdf5;
        --light-error: #fef2f2;
    }

    .practice-container {
        max-width: 800px;
        margin: 0 auto;
        padding: 20px;
    }

    .practice-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 30px;
        padding-bottom: 15px;
        border-bottom: 2px solid #e5e7eb;
    }

    .practice-title {
        margin: 0;
        font-size: 1.25rem;
        color: #1f2937;
    }

    .progress-bar {
        display: flex;
        gap: 8px;
        align-items: center;
    }

    .progress-text {
        font-size: 0.9rem;
        color: #6b7280;
        font-weight: 500;
        min-width: 80px;
    }

    .progress-fill {
        width: 150px;
        height: 6px;
        background: #e5e7eb;
        border-radius: 3px;
        overflow: hidden;
    }

    .progress-fill-inner {
        height: 100%;
        background: var(--primary);
        transition: width 0.3s ease;
    }

    /* Timer */
    .timer {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 6px 14px;
        border-radius: 999px;
        font-size: 1rem;
        font-weight: 700;
        font-variant-numeric: tabular-nums;
        background: #f3f4f6;
        color: #374151;
        border: 2px solid #e5e7eb;
        transition: background .3s, color .3s, border-color .3s;
        min-width: 80px;
        justify-content: center;
    }
    .timer.warning {
        background: #fffbeb;
        color: #b45309;
        border-color: #fcd34d;
    }
    .timer.danger {
        background: #fef2f2;
        color: var(--error);
        border-color: #fca5a5;
        animation: pulse 0.6s ease-in-out infinite alternate;
    }
    .timer.stopped {
        opacity: 0.45;
    }
    @keyframes pulse {
        from { transform: scale(1); }
        to   { transform: scale(1.06); }
    }

    .timeout-banner {
        background: #fef2f2;
        border-left: 4px solid var(--error);
        color: var(--error);
        font-weight: 600;
        padding: 12px 16px;
        border-radius: 8px;
        margin-bottom: 16px;
        display: none;
    }

    .question-card {
        background: white;
        border-radius: 12px;
        border: 1px solid #e5e7eb;
        padding: 40px;
        margin-bottom: 30px;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    .question-number {
        font-size: 0.85rem;
        color: #6b7280;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: 12px;
        font-weight: 600;
    }

    .question-text {
        font-size: 1.25rem;
        color: #1f2937;
        line-height: 1.6;
        margin-bottom: 30px;
        font-weight: 500;
    }

    .choices-container {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }

    .choice-option {
        position: relative;
    }

    .choice-option input[type="radio"] {
        position: absolute;
        opacity: 0;
        cursor: pointer;
        top: 0;
        left: 0;
    }

    .choice-label {
        display: block;
        padding: 16px 16px 16px 48px;
        background: #f9fafb;
        border: 2px solid #e5e7eb;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.2s ease;
        font-size: 1rem;
        color: #1f2937;
        position: relative;
    }

    .choice-label::before {
        content: '';
        position: absolute;
        left: 16px;
        top: 50%;
        transform: translateY(-50%);
        width: 20px;
        height: 20px;
        border: 2px solid #d1d5db;
        border-radius: 50%;
        background: white;
        transition: all 0.2s ease;
    }

    .choice-option input[type="radio"]:checked + .choice-label {
        border-color: var(--primary);
        background: var(--light-primary);
    }

    .choice-option input[type="radio"]:checked + .choice-label::before {
        border-color: var(--primary);
        background: var(--primary);
        box-shadow: inset 0 0 0 3px white;
    }

    .choice-option input[type="radio"]:disabled + .choice-label {
        cursor: not-allowed;
        opacity: 0.9;
    }

    /* After answer is submitted */
    .choice-option.correct input[type="radio"]:checked + .choice-label {
        border-color: var(--success);
        background: var(--light-success);
    }

    .choice-option.correct input[type="radio"]:checked + .choice-label::before {
        border-color: var(--success);
        background: var(--success);
    }

    .choice-option.correct input[type="radio"]:checked + .choice-label::after {
        content: '✓';
        position: absolute;
        right: 16px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--success);
        font-weight: bold;
        font-size: 1.2rem;
    }

    .choice-option.incorrect input[type="radio"]:checked + .choice-label {
        border-color: var(--error);
        background: var(--light-error);
    }

    .choice-option.incorrect input[type="radio"]:checked + .choice-label::before {
        border-color: var(--error);
        background: var(--error);
    }

    .choice-option.incorrect input[type="radio"]:checked + .choice-label::after {
        content: '✕';
        position: absolute;
        right: 16px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--error);
        font-weight: bold;
        font-size: 1.2rem;
    }

    .choice-option.highlight-correct input[type="radio"]:not(:checked) + .choice-label {
        border-color: var(--success);
        background: var(--light-success);
    }

    .choice-option.highlight-correct input[type="radio"]:not(:checked) + .choice-label::after {
        content: '✓';
        position: absolute;
        right: 16px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--success);
        font-weight: bold;
        font-size: 1.2rem;
    }

    .action-buttons {
        display: flex;
        gap: 12px;
        margin-top: 30px;
    }

    .btn {
        padding: 12px 24px;
        border: none;
        border-radius: 8px;
        font-size: 1rem;
        cursor: pointer;
        font-weight: 500;
        transition: all 0.2s ease;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
    }

    .btn-primary {
        background: var(--primary);
        color: white;
        flex: 1;
    }

    .btn-primary:hover:not(:disabled) {
        background: #1d4ed8;
        box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
    }

    .btn-primary:disabled {
        background: #bfdbfe;
        cursor: not-allowed;
    }

    .btn-secondary {
        background: #f3f4f6;
        color: #1f2937;
        border: 1px solid #d1d5db;
    }

    .btn-secondary:hover:not(:disabled) {
        background: #e5e7eb;
    }

    .btn-secondary:disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }

    .feedback-section {
        margin-top: 30px;
        padding: 20px;
        background: var(--light-primary);
        border-left: 4px solid var(--primary);
        border-radius: 8px;
        animation: slideIn 0.3s ease;
    }

    .feedback-section.success {
        background: var(--light-success);
        border-left-color: var(--success);
    }

    .feedback-section.error {
        background: var(--light-error);
        border-left-color: var(--error);
    }

    .feedback-title {
        font-weight: 600;
        color: #1f2937;
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .feedback-section.success .feedback-title {
        color: var(--success);
    }

    .feedback-section.error .feedback-title {
        color: var(--error);
    }

    .feedback-content {
        color: #374151;
        line-height: 1.6;
        font-size: 0.95rem;
    }

    .feedback-content p {
        margin: 0;
    }

    @keyframes slideIn {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .navigation-buttons {
        display: flex;
        justify-content: space-between;
        margin-top: 30px;
        padding-top: 20px;
        border-top: 1px solid #e5e7eb;
    }

    .back-link {
        color: var(--primary);
        text-decoration: none;
        font-weight: 500;
        display: inline-flex;
        align-items: center;
        gap: 6px;
        margin-bottom: 20px;
    }

    .back-link:hover {
        text-decoration: underline;
    }

    .summary-card {
        background: white;
        border-radius: 12px;
        padding: 30px;
        text-align: center;
        border: 2px solid #e5e7eb;
    }

    .summary-card h2 {
        margin-top: 0;
        color: #1f2937;
    }

    .summary-score {
        font-size: 3rem;
        font-weight: bold;
        color: var(--primary);
        margin: 20px 0;
    }

    .summary-message {
        font-size: 1.1rem;
        color: #6b7280;
        margin-bottom: 20px;
    }

    .error-message {
        padding: 20px;
        background: var(--light-error);
        border-left: 4px solid var(--error);
        border-radius: 8px;
        color: var(--error);
        margin-bottom: 20px;
    }

    @media (max-width: 640px) {
        .practice-container {
            padding: 12px;
        }

        .question-card {
            padding: 24px;
        }

        .practice-header {
            flex-direction: column;
            gap: 12px;
            align-items: flex-start;
        }

        .action-buttons {
            flex-direction: column;
        }

        .btn {
            width: 100%;
        }

        .question-text {
            font-size: 1.1rem;
        }
    }
</style>
{% endblock %}

{% block content %}
<div class="practice-container">
    <a href="{% url 'courses:course_detail' course.slug %}" class="back-link">← Back to course</a>

    {% if error %}
        <div class="error-message">
            {{ error }}
        </div>
        <a href="{% url 'courses:course_detail' course.slug %}"><button type="button" class="btn btn-primary">Back to Course</button></a>
    {% else %}
        <div class="practice-header">
            <h1 class="practice-title">{{ course.title|exam_marks }}</h1>
            <div style="display:flex;align-items:center;gap:16px;flex-wrap:wrap;">
                {% if not answered %}
                    <div class="timer" id="timer" aria-live="polite" aria-label="Time remaining">⏱ 1:30</div>
                {% endif %}
                <div class="progress-bar">
                    <span class="progress-text">{{ question_number }}/{{ total_questions }}</span>
                    <div class="progress-fill">
                        <div class="progress-fill-inner" style="width: {{ progress_percent }}%"></div>
                    </div>
                </div>
            </div>
        </div>

        {% if current_question %}
            <div class="question-card">
                <div class="question-number">Question {{ question_number }} of {{ total_questions }}</div>
                <div class="question-text">{{ current_question.text|richtext }}</div>

                <div class="timeout-banner" id="timeout-banner">⏰ Time's up! Moving to next question…</div>

                <form method="post" id="answer-form">
                    {% csrf_token %}
                    <div class="choices-container">
                        {% for choice in choices %}
                            <div class="choice-option {% if answered %}{% if choice.is_correct %}highlight-correct{% elif attempt.selected_choice_id == choice.pk %}incorrect{% endif %}{% endif %}">
                                <input
                                    type="radio"
                                    name="choice"
                                    value="{{ choice.pk }}"
                                    id="choice-{{ choice.pk }}"
                                    {% if answered %}disabled{% endif %}
                                    {% if attempt.selected_choice_id == choice.pk %}checked{% endif %}>
                                <label for="choice-{{ choice.pk }}" class="choice-label">
                                    {{ choice.text|exam_marks }}
                                </label>
                            </div>
                        {% endfor %}
                    </div>

                    <div class="action-buttons">
                        {% if not answered %}
                            <button type="submit" class="btn btn-primary" id="submit-btn">
                                Submit Answer
                            </button>
                        {% else %}
                            {% if has_next %}
                                <button type="button" class="btn btn-primary" onclick="goToNextQuestion()">
                                    Next Question →
                                </button>
                            {% elif all_completed %}
                                <a href="{% url 'practice:practice_results' course.slug %}" class="btn btn-primary">
                                    See Results →
                                </a>
                            {% endif %}
                        {% endif %}
                    </div>
                </form>

                {% if answered %}
                    <div class="feedback-section {% if is_correct %}success{% else %}error{% endif %}">
                        <div class="feedback-title">
                            {% if is_correct %}
                                ✓ Correct!
                            {% else %}
                                ✕ Incorrect
                            {% endif %}
                        </div>
                        {% if attempt.ai_feedback %}
                            <div class="feedback-content">
                                {{ attempt.ai_feedback|richtext }}
                            </div>
                        {% endif %}
                    </div>

                {% endif %}
            </div>
        {% endif %}
    {% endif %}
</div>

<script>
    // Prevent form submission if no choice selected
    document.getElementById('answer-form')?.addEventListener('submit', function(e) {
        const choice = document.querySelector('input[name="choice"]:checked');
        if (!choice) {
            e.preventDefault();
            alert('Please select an answer before submitting.');
        }
    });

    function goToNextQuestion() {
        window.location.href = '?q={{ current_index|add:"1" }}';
    }

    // ── Countdown timer ──────────────────────────────────────────────
    (function () {
        const SECONDS = 90;
        const timerEl = document.getElementById('timer');
        const banner  = document.getElementById('timeout-banner');
        const form    = document.getElementById('answer-form');

        // No timer when question is already answered
        if (!timerEl || !form) return;

        let remaining = SECONDS;
        let stopped   = false;

        function fmt(s) {
            const m = Math.floor(s / 60);
            const sec = String(s % 60).padStart(2, '0');
            return `⏱ ${m}:${sec}`;
        }

        function update() {
            timerEl.textContent = fmt(remaining);
            timerEl.classList.remove('warning', 'danger');
            if (remaining <= 10) {
                timerEl.classList.add('danger');
            } else if (remaining <= 30) {
                timerEl.classList.add('warning');
            }
        }

        function stop() {
            stopped = true;
            timerEl.classList.add('stopped');
            timerEl.classList.remove('warning', 'danger');
        }

        // Stop timer as soon as the form is submitted
        form.addEventListener('submit', stop);

        update();

        const interval = setInterval(function () {
            if (stopped) { clearInterval(interval); return; }
            remaining--;
            update();

            if (remaining <= 0) {
                clearInterval(interval);
                stop();
                const hasChoice = document.querySelector('input[name="choice"]:checked');
                if (hasChoice) {
                    // Answer already selected — submit it
                    form.submit();
                } else {
                    // No answer — show banner and auto-advance after 2 s
                    banner.style.display = 'block';
                    setTimeout(function () {
                        {% if has_next %}
                            window.location.href = '?q={{ current_index|add:"1" }}';
                        {% else %}
                            window.location.href = '{% url "courses:course_detail" course.slug %}';
                        {% endif %}
                    }, 2000);
                }
            }
        }, 1000);
    })();
</script>
{% endblock %}