{% extends "base.html" %}

{% block title %}NeuroScope MRI | Upload And Predict{% endblock %}

{% block content %}
<section class="rounded-[2rem] glass-card p-6 sm:p-8 lg:p-10">
    <div class="grid gap-8 lg:grid-cols-[0.95fr_1.05fr] lg:items-start">
        <div class="space-y-6">
            <div class="glass-panel rounded-[2rem] p-6 sm:p-8">
                <p class="text-xs uppercase tracking-[0.24em] text-violet-100/50">Step Two</p>
                <h1 class="mt-3 text-3xl font-bold text-white sm:text-4xl">Upload MRI And Run Prediction</h1>
                <p class="mt-4 text-sm leading-8 soft-text sm:text-base">
                    This is the analysis workspace. Upload a brain MRI image here and the system will classify the scan, generate a segmentation overlay, and store the result in history.
                </p>
            </div>

            <div class="glass-panel rounded-[2rem] p-6">
                <p class="text-xs uppercase tracking-[0.22em] text-violet-100/50">What Happens Here</p>
                <div class="mt-4 grid gap-4 sm:grid-cols-3">
                    <div class="rounded-2xl border border-white/10 bg-white/5 p-4">
                        <p class="text-lg font-bold text-white">1</p>
                        <p class="mt-2 text-sm text-white/75">Image preprocessing prepares the scan for the trained models.</p>
                    </div>
                    <div class="rounded-2xl border border-white/10 bg-white/5 p-4">
                        <p class="text-lg font-bold text-white">2</p>
                        <p class="mt-2 text-sm text-white/75">Classification and segmentation run to produce prediction output.</p>
                    </div>
                    <div class="rounded-2xl border border-white/10 bg-white/5 p-4">
                        <p class="text-lg font-bold text-white">3</p>
                        <p class="mt-2 text-sm text-white/75">The result page shows confidence, overlay image, and summary.</p>
                    </div>
                </div>
            </div>
        </div>

        <div id="upload-section" class="glass-panel rounded-[2rem] p-5 sm:p-6 lg:p-8">
            <div class="mb-6 flex flex-col gap-3 sm:flex-row sm:items-end sm:justify-between">
                <div>
                    <p class="text-xs uppercase tracking-[0.24em] text-violet-100/50">Upload Workspace</p>
                    <h2 class="mt-2 text-2xl font-bold text-white sm:text-3xl">Select An MRI Image</h2>
                </div>
                <span class="rounded-full border border-white/10 bg-white/5 px-3 py-2 text-xs font-semibold text-white/65">
                    JPG, JPEG, PNG
                </span>
            </div>

            <form action="/upload" method="post" enctype="multipart/form-data" class="space-y-6">
                <div id="drop-area" class="group relative overflow-hidden rounded-[2rem] border border-dashed border-violet-300/25 bg-gradient-to-br from-white/5 to-violet-500/10 p-6 transition duration-300 hover:border-violet-300/40 hover:bg-white/10 sm:p-8">
                    <div class="absolute inset-0 bg-[radial-gradient(circle_at_top,rgba(168,85,247,0.12),transparent_38%)] opacity-80"></div>
                    <div class="relative z-10 flex flex-col items-center justify-center text-center">
                        <div class="mb-5 flex h-20 w-20 items-center justify-center rounded-[1.75rem] border border-white/10 bg-black/20">
                            <svg class="h-10 w-10 text-violet-100/90" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8">
                                <path stroke-linecap="round" stroke-linejoin="round" d="M3 16l4.5-4.5a2 2 0 012.828 0l2.344 2.344a2 2 0 002.828 0L21 8.5" />
                                <path stroke-linecap="round" stroke-linejoin="round" d="M14 7h7m0 0v7m0-7L10 18" />
                                <rect x="3" y="4" width="18" height="16" rx="3" />
                            </svg>
                        </div>
                        <h3 class="text-2xl font-bold text-white">Drop your MRI image here</h3>
                        <p class="mt-3 max-w-xl text-sm leading-7 soft-text">Preview the scan before analysis and then submit it to generate prediction output.</p>
                        <input type="file" name="mri_image" id="file-input" class="hidden" accept=".jpg,.jpeg,.png">
                        <label for="file-input" class="mt-6 inline-flex cursor-pointer items-center justify-center rounded-2xl bg-gradient-to-r from-violet-700 to-fuchsia-500 px-6 py-3 text-sm font-semibold text-white transition duration-300 hover:scale-[1.02]">
                            Select MRI File
                        </label>
                    </div>

                    <div id="file-preview" class="relative z-10 mt-8 hidden rounded-[1.75rem] border border-white/10 bg-black/20 p-4 sm:p-6">
                        <div class="mb-4 flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between">
                            <p class="text-sm text-white/75">Selected file: <span id="file-name" class="font-semibold text-white"></span></p>
                            <span class="rounded-full border border-emerald-300/20 bg-emerald-500/12 px-3 py-1 text-xs font-semibold text-emerald-100">Preview Ready</span>
                        </div>
                        <div class="overflow-hidden rounded-2xl border border-white/10 bg-[#0d0d16]">
                            <img id="image-preview" class="max-h-[26rem] w-full object-contain" src="" alt="Preview">
                        </div>
                    </div>
                </div>

                <div class="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
                    <a href="/" class="inline-flex items-center justify-center rounded-2xl border border-white/10 bg-white/5 px-6 py-3 text-sm font-semibold text-white/80 transition hover:bg-white/10 hover:text-white">
                        Back To Landing Page
                    </a>
                    <button type="submit" class="inline-flex items-center justify-center rounded-2xl bg-white px-6 py-3 text-sm font-bold text-[#140f25] transition duration-300 hover:scale-[1.02] hover:bg-violet-100">
                        Analyze MRI
                    </button>
                </div>
            </form>
        </div>
    </div>
</section>
{% endblock %}

{% block scripts %}
<script>
    const dropArea = document.getElementById('drop-area');
    const fileInput = document.getElementById('file-input');
    const filePreview = document.getElementById('file-preview');
    const fileName = document.getElementById('file-name');
    const imagePreview = document.getElementById('image-preview');

    ['dragenter', 'dragover', 'dragleave', 'drop'].forEach((eventName) => {
        dropArea.addEventListener(eventName, preventDefaults, false);
    });

    function preventDefaults(event) {
        event.preventDefault();
        event.stopPropagation();
    }

    ['dragenter', 'dragover'].forEach((eventName) => {
        dropArea.addEventListener(eventName, highlight, false);
    });

    ['dragleave', 'drop'].forEach((eventName) => {
        dropArea.addEventListener(eventName, unhighlight, false);
    });

    function highlight() {
        dropArea.style.borderColor = 'rgba(216, 180, 254, 0.55)';
        dropArea.style.backgroundColor = 'rgba(255, 255, 255, 0.08)';
    }

    function unhighlight() {
        dropArea.style.borderColor = '';
        dropArea.style.backgroundColor = '';
    }

    dropArea.addEventListener('drop', handleDrop, false);

    function handleDrop(event) {
        const files = event.dataTransfer.files;
        fileInput.files = files;
        updateFilePreview();
    }

    fileInput.addEventListener('change', updateFilePreview);

    function updateFilePreview() {
        if (!fileInput.files || !fileInput.files[0]) {
            return;
        }

        const file = fileInput.files[0];
        fileName.textContent = file.name;

        const reader = new FileReader();
        reader.onload = function(event) {
            imagePreview.src = event.target.result;
        };
        reader.readAsDataURL(file);

        filePreview.classList.remove('hidden');
    }
</script>
{% endblock %}