{% extends "base.html" %}

{% block title %}Subjective Question Generator{% endblock %}

{% block head %}
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no, maximum-scale=1, viewport-fit=cover">
<style>
    :root {
        --app-bg: #181a1c;
        --card-bg: #212529;
        --border-color: #495057;
        --primary-color: #0d6efd;
        --primary-bg-subtle: rgba(13, 110, 253, 0.1);
    }

    body {
        background-color: var(--app-bg);
        color: #e9ecef;
    }

    /* Centered Layout */
    .generator-wrapper {
        min-height: calc(100vh - 56px);
        min-height: calc(100dvh - 56px);
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 1rem;
        padding-bottom: env(safe-area-inset-bottom);
    }

    .main-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 16px;
        box-shadow: 0 4px 24px rgba(0,0,0,0.4);
        width: 100%;
        max-width: 600px;
        overflow: hidden;
    }

    /* Touch-friendly Upload Zone */
    .upload-zone {
        position: relative;
        border: 2px dashed var(--border-color);
        border-radius: 12px;
        padding: 2rem 1rem;
        text-align: center;
        background: rgba(255,255,255,0.02);
        transition: all 0.2s ease;
        cursor: pointer;
        min-height: 250px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .upload-zone:active, .upload-zone.drag-over {
        border-color: var(--primary-color);
        background: var(--primary-bg-subtle);
        transform: scale(0.99);
    }

    .upload-zone.has-file {
        border-style: solid;
        border-color: #198754;
        background: rgba(25, 135, 84, 0.05);
        padding: 1rem;
    }

    /* Hidden Input */
    .file-input {
        position: absolute;
        top: 0; left: 0;
        width: 100%; height: 100%;
        opacity: 0;
        cursor: pointer;
        z-index: 10;
    }

    /* Icon & Text */
    .upload-icon {
        font-size: 3rem;
        color: #adb5bd;
        margin-bottom: 1rem;
        transition: color 0.2s;
    }

    .upload-zone.has-file .upload-icon {
        display: none;
    }

    .zone-text {
        font-weight: 500;
        color: #e9ecef;
    }
    
    .zone-subtext {
        font-size: 0.85rem;
        color: #adb5bd;
        margin-top: 0.5rem;
    }

    /* Image Preview */
    #image-preview {
        max-width: 100%;
        max-height: 300px;
        border-radius: 8px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
        display: none; /* Hidden by default */
        margin-bottom: 1rem;
    }

    /* Button Styling */
    .btn-action {
        min-height: 54px;
        font-size: 1.1rem;
        font-weight: 600;
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        transition: transform 0.1s;
    }
    
    .btn-action:active {
        transform: scale(0.98);
    }
</style>
{% endblock %}

{% block content %}
<div class="generator-wrapper">
    <div class="main-card">
        
        <!-- Header -->
        <div class="p-4 border-bottom border-secondary" style="border-color: #495057 !important;">
            <div class="d-flex align-items-center justify-content-center mb-2">
                <div class="bg-primary bg-opacity-10 text-primary p-3 rounded-circle d-flex align-items-center justify-content-center" style="width: 60px; height: 60px;">
                    <i class="bi bi-magic fs-3"></i>
                </div>
            </div>
            <div class="text-center">
                <h1 class="h4 mb-1">Subjective Generator</h1>
                <p class="text-secondary small mb-0">AI will transcribe and format your handwritten or printed questions.</p>
            </div>
        </div>

        <div class="card-body p-4">
            <!-- Remote Camera Component -->
            {% include 'camera_receiver_component.html' %}

            <form action="{{ url_for('subjective.generate') }}" method="POST" enctype="multipart/form-data" id="generateForm">
                
                <!-- Upload Zone -->
                <div class="mb-4">
                    <div class="d-flex justify-content-between align-items-center mb-2">
                        <label class="form-label mb-0">Image</label>
                        <button type="button" class="btn btn-sm btn-outline-info" onclick="toggleCameraReceiver()">
                            <i class="bi bi-camera-video me-1"></i> Use Remote Camera
                        </button>
                    </div>
                    <div class="upload-zone" id="drop-zone">
                        <!-- Preview Image -->
                        <img id="image-preview" alt="Preview">
                        
                        <!-- Placeholder Content -->
                        <div id="placeholder-content">
                            <i class="bi bi-cloud-upload upload-icon"></i>
                            <div class="zone-text" id="main-text">Tap to upload image</div>
                            <div class="zone-subtext" id="sub-text">Supports JPG, PNG (Max 10MB)</div>
                        </div>

                        <input type="file" class="file-input" id="images-upload" name="image" accept="image/*">
                    </div>
                </div>

                <!-- Manual JSON Input (Accordion) -->
                <div class="accordion mb-4" id="manualInputAccordion">
                    <div class="accordion-item bg-transparent border-secondary">
                        <h2 class="accordion-header" id="headingManual">
                            <button class="accordion-button collapsed bg-transparent text-secondary shadow-none" type="button" data-bs-toggle="collapse" data-bs-target="#collapseManual" aria-expanded="false" aria-controls="collapseManual">
                                <i class="bi bi-code-square me-2"></i> Or Paste JSON Manually
                            </button>
                        </h2>
                        <div id="collapseManual" class="accordion-collapse collapse" aria-labelledby="headingManual" data-bs-parent="#manualInputAccordion">
                            <div class="accordion-body text-secondary">
                                <p class="small mb-2">If Gemini is unavailable, paste the raw JSON response here.</p>
                                <textarea class="form-control bg-dark text-light border-secondary font-monospace small" name="json_data" id="json_data" rows="5" placeholder='[{"question_number_within_topic": "1", "question_topic": "Topic", "question_html": "..."}]'></textarea>
                            </div>
                        </div>
                    </div>
                </div>

                <!-- Action Button -->
                <button type="submit" class="btn btn-primary w-100 btn-action shadow" id="generateBtn">
                    <span id="btnSpinner" class="spinner-border spinner-border-sm d-none" role="status" aria-hidden="true"></span>
                    <span id="btnText">Transcribe & Generate</span>
                    <i class="bi bi-stars" id="btnIcon"></i>
                </button>

            </form>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script>
    const fileInput = document.getElementById('images-upload');
    const dropZone = document.getElementById('drop-zone');
    const previewImg = document.getElementById('image-preview');
    const placeholder = document.getElementById('placeholder-content');
    const mainText = document.getElementById('main-text');
    const subText = document.getElementById('sub-text');
    const form = document.getElementById('generateForm');

    function toggleCameraReceiver() {
        const component = document.getElementById('camera-receiver-component');
        if (component.style.display === 'none') {
            component.style.display = 'block';
            if (typeof initCameraReceiver === 'function') {
                initCameraReceiver();
            }
        } else {
            component.style.display = 'none';
        }
    }

    // --- File Selection & Preview ---
    fileInput.addEventListener('change', function(e) {
        const file = this.files[0];
        
        if (file) {
            // Show file name
            dropZone.classList.add('has-file');
            mainText.innerHTML = `<i class="bi bi-check-circle-fill text-success"></i> Selected`;
            subText.textContent = file.name;

            // Render Preview
            const reader = new FileReader();
            reader.onload = function(e) {
                previewImg.src = e.target.result;
                previewImg.style.display = 'block';
                // Hide icon, keep text below
                document.querySelector('.upload-icon').style.display = 'none';
            }
            reader.readAsDataURL(file);
        } else {
            resetUI();
        }
    });

    function resetUI() {
        dropZone.classList.remove('has-file');
        previewImg.style.display = 'none';
        previewImg.src = '';
        document.querySelector('.upload-icon').style.display = 'block';
        mainText.textContent = "Tap to upload image";
        subText.textContent = "Supports JPG, PNG (Max 10MB)";
    }

    // --- Drag & Drop Visuals ---
    ['dragenter', 'dragover'].forEach(evt => {
        dropZone.addEventListener(evt, (e) => {
            e.preventDefault();
            dropZone.classList.add('drag-over');
        });
    });

    ['dragleave', 'drop'].forEach(evt => {
        dropZone.addEventListener(evt, (e) => {
            e.preventDefault();
            dropZone.classList.remove('drag-over');
        });
    });

    // --- Form Submission State ---
    form.addEventListener('submit', function(e) {
        const hasFile = fileInput.files && fileInput.files.length > 0;
        const hasJson = document.getElementById('json_data').value.trim().length > 0;

        if (!hasFile && !hasJson) {
            e.preventDefault();
            alert("Please select an image or provide JSON data.");
            return;
        }

        const btn = document.getElementById('generateBtn');
        const text = document.getElementById('btnText');
        const icon = document.getElementById('btnIcon');
        const spinner = document.getElementById('btnSpinner');

        btn.disabled = true;
        btn.classList.add('opacity-75');
        icon.classList.add('d-none');
        spinner.classList.remove('d-none');
        text.textContent = 'Processing...';
    });
</script>
{% endblock %}