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

{% block title %}Home — PRISM△{% endblock %}

{% block extra_head %}
<style>

   body {
    position: relative;
    background-color: #000;
  }
  
  body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("{% static 'prism8x.png' %}");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 70%;
    mask-image: radial-gradient(circle at center, 
                                rgba(0,0,0,0.9) 0%, 
                                rgba(0,0,0,0.7) 20%, 
                                rgba(0,0,0,0.4) 35%,
                                rgba(0,0,0,0.15) 50%,
                                rgba(0,0,0,0) 65%);
    -webkit-mask-image: radial-gradient(circle at center, 
                                        rgba(0,0,0,0.9) 0%, 
                                        rgba(0,0,0,0.7) 20%, 
                                        rgba(0,0,0,0.4) 35%,
                                        rgba(0,0,0,0.15) 50%,
                                        rgba(0,0,0,0) 65%);
    z-index: -1;
  }
  /* --- Hero & Background --- */
  .hero-section {
    position: relative;
    padding: 6rem 1rem 1rem;
    overflow: hidden;
  }

  .hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
    z-index: -1;
  }

  /* Branding */
  .hero-brand {
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -1.5px;
  }

  .brand-prism-hero {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    /* Glow effect */
    filter: drop-shadow(0 0 30px rgba(139, 92, 246, 0.4));
  }

  /* --- Vector Container --- */
  .vector-wrapper {
    margin: 8rem auto 0;
    max-width: 950px;
    position: relative;
    user-select: none;
  }

  /* Container for the numbers */
  .sparse-strip {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 0.35rem;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 25px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    min-height: 140px;
  }

  /* The "Zero" elements */
  .val {
    color: rgba(255, 255, 255, 0.25);
    font-weight: 500;
    position: relative;
    width: 14px;
    text-align: center;
    transition: all 0.5s ease;
  }

  /* The Active elements (Features) */
  .val.active {
    color: #c4b5fd;
    font-weight: 700;
    text-shadow: 0 0 12px var(--accent);
    z-index: 10;
  }

  /* The Spike (Bar) growing from the number */
  .spike {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    /* Rainbow gradient for the spike */
    background: var(--gradient-primary);
    border-radius: 4px;
    box-shadow: 0 0 20px var(--accent);
    opacity: 0;
    animation: growUp 1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    transform-origin: bottom;
  }

  /* Label value floating above spike */
  .spike::after {
    content: attr(data-value);
    position: absolute;
    top: -28px;
    left: 50%;
    transform: translateX(-50%);
    background: #000;
    border: 1px solid var(--accent);
    color: #c4b5fd;
    font-size: 0.7rem;
    padding: 2px 5px;
    border-radius: 4px;
    white-space: nowrap;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
  }

  @keyframes growUp {
    from {
      height: 0;
      opacity: 0;
    }

    to {
      opacity: 1;
    }
  }

  /* Steps Container */
  .steps-container {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding: 0 10%;
    position: relative;
  }

  .step-node {
    text-align: center;
    width: 160px;
    opacity: 0.7;
    transition: opacity 0.3s;
    position: relative;
  }

  .step-node:hover {
    opacity: 1;
  }

  .step-num {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    font-size: 0.8rem;
    line-height: 22px;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
  }

  .step-node:hover .step-num {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 10px rgba(255, 58, 58, 0.3);
  }

  .step-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
  }

  .step-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
  }

  /* Citation */
  .citation-box {
    margin-top: 6rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.4;
    transition: opacity 0.2s;
  }

  .citation-box:hover {
    opacity: 1;
  }

  @media (max-width: 768px) {
    .sparse-strip {
      font-size: 0.7rem;
      gap: 0.1rem;
      overflow-x: hidden;
    }

    .hero-section {
      padding-top: 4rem;
    }

    .vector-wrapper {
      margin-top: 5rem;
    }

    .step-desc {
      display: none;
    }
  }
</style>
{% endblock %}

{% block content %}
<div class="hero-section text-center">
  <div class="hero-bg-grid"></div>

  <h1 class="display-3 hero-brand mb-3">
    PRISM<span class="brand-prism-hero">Δ</span>
  </h1>

  <p class="lead text-muted mb-5 mx-auto" style="max-width: 650px;">
    Illuminating the "black box" of embeddings.<br>
  </p>

  <div class="d-flex justify-content-center gap-3 position-relative z-2">
    <a href="{% url 'embeddings:upload_dataset' %}" class="btn btn-outline-accent px-4 py-2 fw-semibold shadow-lg">
      <i class="bi bi-upload me-2"></i>Load Dataset
    </a>

  </div>
</div>

<div class="vector-wrapper">

  <div class="sparse-strip" id="sparse-container"></div>

  <div class="steps-container">
    <div class="step-node">
      <div class="step-num">1</div>
      <div class="step-title">Ingest</div>
      <div class="step-desc">Dense Embeddings</div>
    </div>

    <div class="step-node">
      <div class="step-num">2</div>
      <div class="step-title">Train SAE</div>
      <div class="step-desc">Sparse Features</div>
    </div>

    <div class="step-node">
      <div class="step-num">3</div>
      <div class="step-title">Interpret</div>
      <div class="step-desc">Semantic Labels</div>
    </div>
  </div>

  <div class="text-center citation-box">
    <a href="https://arxiv.org/abs/2408.00657" target="_blank" class="text-decoration-none text-muted">
      <i class="bi bi-journal-text me-1"></i> Reference:
      <em>"Disentangling Dense Embeddings with Sparse Autoencoders"</em> (O'Neill et al., 2024)
    </a>
  </div>

</div>
{% endblock %}

{% block extra_js %}
<script>
  document.addEventListener('DOMContentLoaded', function () {
    const container = document.getElementById('sparse-container');
    const totalItems = window.innerWidth < 768 ? 25 : 40;

    // Genera numero casuale di spike ogni volta (tra 3 e 6)
    const numSpikes = Math.floor(Math.random() * 4) + 3;

    // Set per evitare duplicati
    let spikeIndices = new Set();
    while (spikeIndices.size < numSpikes) {
      // Evita i primissimi e ultimissimi indici per estetica
      const r = Math.floor(Math.random() * (totalItems - 6)) + 3;
      spikeIndices.add(r);
    }

    for (let i = 0; i < totalItems; i++) {
      const span = document.createElement('span');
      span.classList.add('val');

      if (spikeIndices.has(i)) {
        span.classList.add('active');

        // Valori casuali per realismo
        const val = (Math.random() * (0.99 - 0.35) + 0.35).toFixed(2);
        const height = Math.floor(val * 120) + 'px';
        const delay = (Math.random() * 0.6).toFixed(2) + 's';

        span.innerText = val.substring(0, 3);

        const spike = document.createElement('div');
        spike.classList.add('spike');
        spike.style.height = height;
        spike.style.animationDelay = delay;
        spike.setAttribute('data-value', val);

        span.appendChild(spike);
      } else {
        span.innerText = '0';
      }

      container.appendChild(span);
    }
  });
</script>
{% endblock %}