{% extends 'base.html' %}
{% load static %}

{% block title %}Upload Image — Constellar{% endblock %}

{% block extra_css %}
<style>
    .dropzone {
        border: 1.5px dashed rgba(99,102,241,.35);
        border-radius: 14px;
        background: rgba(99,102,241,.03);
        transition: border-color .2s, background .2s;
        cursor: pointer;
    }
    .dropzone:hover, .dropzone.dragging {
        border-color: rgba(99,102,241,.7);
        background: rgba(99,102,241,.07);
    }
    .dropzone.has-file { cursor: default; }

    .upload-icon {
        width: 64px; height: 64px;
        border-radius: 16px;
        margin: 0 auto 1.25rem;
        display: flex; align-items: center; justify-content: center;
        background: rgba(99,102,241,.12);
        border: 1px solid rgba(99,102,241,.25);
        color: #a5b4fc;
        transition: transform .2s;
    }
    .dropzone:hover .upload-icon { transform: translateY(-3px); }

    .tip-card {
        display: flex; gap: 1rem; align-items: flex-start;
        padding: 1.25rem;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 10px;
    }
    .tip-icon {
        width: 38px; height: 38px; flex-shrink: 0;
        border-radius: 9px;
        display: flex; align-items: center; justify-content: center;
        background: rgba(99,102,241,.12);
        border: 1px solid rgba(99,102,241,.22);
        color: #a5b4fc;
    }

    .remove-btn {
        position: absolute; top: -10px; right: -10px;
        width: 28px; height: 28px;
        border-radius: 50%;
        border: none; cursor: pointer;
        background: #ef4444; color: #fff;
        display: flex; align-items: center; justify-content: center;
        font-size: .875rem; line-height: 1;
        box-shadow: 0 2px 8px rgba(0,0,0,.4);
        transition: background .15s;
    }
    .remove-btn:hover { background: #dc2626; }

    .submit-btn {
        font-family: 'Inter', sans-serif;
        font-size: .9375rem; font-weight: 600;
        color: #fff; padding: .8rem 2.25rem;
        border-radius: 8px; border: none; cursor: pointer;
        background: var(--accent);
        transition: all .18s;
        display: inline-flex; align-items: center; gap: .5rem;
    }
    .submit-btn:hover:not(:disabled) {
        background: #818cf8;
        box-shadow: 0 0 24px rgba(99,102,241,.4);
        transform: translateY(-1px);
    }
    .submit-btn:disabled { opacity: .45; cursor: not-allowed; }

    .spin {
        width: 15px; height: 15px; border-radius: 50%;
        border: 2px solid rgba(255,255,255,.3);
        border-top-color: #fff;
        animation: spin .7s linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }
</style>
{% endblock %}

{% block content %}

<!-- ════ HEADER ════ -->
<section class="section" style="padding-top:4rem; padding-bottom:2.5rem; text-align:center;">
    <div style="max-width:560px; margin:0 auto;">
        <div class="tag" style="margin-bottom:1.25rem;">Image Analysis</div>
        <h1 style="font-family:'Orbitron',monospace; font-size:clamp(1.6rem,3.5vw,2.5rem); font-weight:900; margin:0 0 1rem; letter-spacing:-.01em;">
            Upload a Night Sky Image
        </h1>
        <p style="font-size:.9375rem; color:var(--muted); line-height:1.7; margin:0;">
            Drop in a photo of the stars and our detection model will identify every constellation it can find.
        </p>
    </div>
</section>

<!-- ════ UPLOAD FORM ════ -->
<section style="padding:0 1.5rem;">
    <div style="max-width:640px; margin:0 auto;">
        <form id="uploadForm" method="post" enctype="multipart/form-data" action="{% url 'process_upload' %}">
            {% csrf_token %}

            <div id="dropZone" class="dropzone" style="padding:3rem 2rem; text-align:center; position:relative;">
                <!-- default state -->
                <div id="uploadContent">
                    <div class="upload-icon">
                        <svg width="26" height="26" fill="none" stroke="currentColor" stroke-width="1.8" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" d="M3 16.5v2.25A2.25 2.25 0 0 0 5.25 21h13.5A2.25 2.25 0 0 0 21 18.75V16.5m-13.5-9L12 3m0 0 4.5 4.5M12 3v13.5"/>
                        </svg>
                    </div>
                    <h3 style="font-size:1.0625rem; font-weight:600; margin:0 0 .5rem; color:#fff;">
                        Drop your image here, or click to browse
                    </h3>
                    <p style="font-size:.8125rem; color:var(--muted); margin:0;">
                        JPG, JPEG or PNG &middot; up to 10 MB
                    </p>
                </div>

                <!-- preview state -->
                <div id="previewArea" class="hidden">
                    <div style="position:relative; display:inline-block;">
                        <img id="previewImage" style="max-width:100%; max-height:320px; border-radius:10px; border:1px solid var(--border);" alt="Selected image preview" />
                        <button type="button" id="removeImage" class="remove-btn" aria-label="Remove image">✕</button>
                    </div>
                    <p id="fileName" style="font-size:.875rem; font-weight:500; color:#a5b4fc; margin:1rem 0 .125rem;"></p>
                    <p id="fileSize" style="font-size:.75rem; color:var(--muted); margin:0;"></p>
                </div>

                <input type="file" id="fileInput" name="image" accept=".jpg,.jpeg,.png" class="hidden" required>
            </div>

            <div style="text-align:center; margin-top:1.75rem;">
                <button type="submit" id="submitBtn" disabled class="submit-btn">
                    <span id="submitText">Select an image first</span>
                    <span id="loadingSpinner" class="hidden"><span class="spin"></span></span>
                </button>
            </div>
        </form>
    </div>
</section>

<!-- ════ TIPS ════ -->
<section class="section" style="padding-top:4.5rem; padding-bottom:2rem;">
    <div style="max-width:820px; margin:0 auto;">
        <div style="text-align:center; margin-bottom:2rem;">
            <p class="section-label" style="justify-content:center;">Better Results</p>
            <h2 style="font-family:'Orbitron',monospace; font-size:clamp(1.2rem,2.5vw,1.6rem); font-weight:700; margin:0;">
                Tips for Accurate Detection
            </h2>
        </div>

        <div style="display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:.875rem;">
            <div class="tip-card">
                <div class="tip-icon">
                    <svg width="18" height="18" fill="none" stroke="currentColor" stroke-width="1.8" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" d="M21.752 15.002A9.72 9.72 0 0 1 18 15.75c-5.385 0-9.75-4.365-9.75-9.75 0-1.33.266-2.597.748-3.752A9.753 9.753 0 0 0 3 11.25C3 16.635 7.365 21 12.75 21a9.753 9.753 0 0 0 9.002-5.998Z"/>
                    </svg>
                </div>
                <div>
                    <h3 style="font-size:.875rem; font-weight:600; margin:0 0 .375rem;">Clear night sky</h3>
                    <p style="font-size:.78125rem; color:var(--muted); line-height:1.6; margin:0;">Minimal cloud cover and low light pollution give the model the cleanest star patterns to work with.</p>
                </div>
            </div>

            <div class="tip-card">
                <div class="tip-icon">
                    <svg width="18" height="18" fill="none" stroke="currentColor" stroke-width="1.8" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" d="M6.827 6.175A2.31 2.31 0 0 1 5.186 7.23c-.38.054-.757.112-1.134.175C2.999 7.58 2.25 8.507 2.25 9.574V18a2.25 2.25 0 0 0 2.25 2.25h15A2.25 2.25 0 0 0 21.75 18V9.574c0-1.067-.75-1.994-1.802-2.169a47.865 47.865 0 0 0-1.134-.175 2.31 2.31 0 0 1-1.64-1.055l-.822-1.316a2.192 2.192 0 0 0-1.736-1.039 48.774 48.774 0 0 0-5.232 0 2.192 2.192 0 0 0-1.736 1.039l-.821 1.316Z"/>
                        <path stroke-linecap="round" stroke-linejoin="round" d="M16.5 12.75a4.5 4.5 0 1 1-9 0 4.5 4.5 0 0 1 9 0Z"/>
                    </svg>
                </div>
                <div>
                    <h3 style="font-size:.875rem; font-weight:600; margin:0 0 .375rem;">High resolution</h3>
                    <p style="font-size:.78125rem; color:var(--muted); line-height:1.6; margin:0;">Sharper images mean more stars visible to the detector — avoid heavy compression or blur.</p>
                </div>
            </div>

            <div class="tip-card">
                <div class="tip-icon">
                    <svg width="18" height="18" fill="none" stroke="currentColor" stroke-width="1.8" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" d="M11.48 3.499a.562.562 0 0 1 1.04 0l2.125 5.111a.563.563 0 0 0 .475.345l5.518.442c.499.04.701.663.321.988l-4.204 3.602a.563.563 0 0 0-.182.557l1.285 5.385a.562.562 0 0 1-.84.61l-4.725-2.885a.562.562 0 0 0-.586 0L6.982 20.54a.562.562 0 0 1-.84-.61l1.285-5.386a.562.562 0 0 0-.182-.557l-4.204-3.602a.562.562 0 0 1 .321-.988l5.518-.442a.563.563 0 0 0 .475-.345L11.48 3.5Z"/>
                    </svg>
                </div>
                <div>
                    <h3 style="font-size:.875rem; font-weight:600; margin:0 0 .375rem;">Wide framing</h3>
                    <p style="font-size:.78125rem; color:var(--muted); line-height:1.6; margin:0;">Include full star patterns rather than tight crops — constellations need context to be recognized.</p>
                </div>
            </div>
        </div>
    </div>
</section>

<!-- ════ OTHER METHODS ════ -->
<section class="section" style="padding-top:1.5rem; text-align:center;">
    <p style="font-size:.8125rem; color:var(--muted); margin:0 0 1rem;">Prefer a different method?</p>
    <div style="display:flex; gap:.75rem; justify-content:center; flex-wrap:wrap;">
        <a href="{% url 'detect' %}" class="btn-ghost" style="padding:.65rem 1.375rem;">Live Camera Detection</a>
        <a href="{% url 'database' %}" class="btn-ghost" style="padding:.65rem 1.375rem;">Browse Database</a>
    </div>
</section>

{% endblock %}

{% block extra_js %}
<script>
    const dropZone = document.getElementById('dropZone');
    const fileInput = document.getElementById('fileInput');
    const uploadContent = document.getElementById('uploadContent');
    const previewArea = document.getElementById('previewArea');
    const previewImage = document.getElementById('previewImage');
    const fileName = document.getElementById('fileName');
    const fileSize = document.getElementById('fileSize');
    const removeImage = document.getElementById('removeImage');
    const submitBtn = document.getElementById('submitBtn');
    const submitText = document.getElementById('submitText');
    const loadingSpinner = document.getElementById('loadingSpinner');
    const uploadForm = document.getElementById('uploadForm');

    dropZone.addEventListener('click', () => {
        if (!previewArea.classList.contains('hidden')) return;
        fileInput.click();
    });

    dropZone.addEventListener('dragover', (e) => {
        e.preventDefault();
        dropZone.classList.add('dragging');
    });

    dropZone.addEventListener('dragleave', (e) => {
        e.preventDefault();
        dropZone.classList.remove('dragging');
    });

    dropZone.addEventListener('drop', (e) => {
        e.preventDefault();
        dropZone.classList.remove('dragging');
        if (e.dataTransfer.files.length > 0) handleFile(e.dataTransfer.files[0]);
    });

    fileInput.addEventListener('change', (e) => {
        if (e.target.files.length > 0) handleFile(e.target.files[0]);
    });

    function handleFile(file) {
        const validTypes = ['image/jpeg', 'image/jpg', 'image/png'];
        if (!validTypes.includes(file.type)) {
            alert('Please select a valid image file (JPG, JPEG, or PNG)');
            return;
        }
        if (file.size > 10 * 1024 * 1024) {
            alert('File size must be less than 10MB');
            return;
        }

        const reader = new FileReader();
        reader.onload = function(e) {
            previewImage.src = e.target.result;
            fileName.textContent = file.name;
            fileSize.textContent = `${(file.size / 1024 / 1024).toFixed(2)} MB`;

            uploadContent.classList.add('hidden');
            previewArea.classList.remove('hidden');
            dropZone.classList.add('has-file');

            submitBtn.disabled = false;
            submitText.textContent = 'Analyze Constellations';
        };
        reader.readAsDataURL(file);
    }

    removeImage.addEventListener('click', (e) => {
        e.stopPropagation();
        fileInput.value = '';
        previewArea.classList.add('hidden');
        uploadContent.classList.remove('hidden');
        dropZone.classList.remove('has-file');
        submitBtn.disabled = true;
        submitText.textContent = 'Select an image first';
    });

    uploadForm.addEventListener('submit', () => {
        submitBtn.disabled = true;
        submitText.textContent = 'Analyzing…';
        loadingSpinner.classList.remove('hidden');
    });
</script>
{% endblock %}