{% extends 'base.html' %}

{% block title %}Article Spinner — Free Online Tool{% endblock %}

{% block content %}
<div class="container py-5">

  <!-- Breadcrumb -->
  <nav aria-label="breadcrumb" class="mb-4">
    <ol class="breadcrumb">
      <li class="breadcrumb-item"><a href="{{ url_for('main.index') }}">Home</a></li>
      <li class="breadcrumb-item"><a href="{{ url_for('main.index') }}#webtools">Web Tools</a></li>
      <li class="breadcrumb-item active" aria-current="page">Article Spinner</li>
    </ol>
  </nav>

  <!-- Page Header -->
  <div class="row mb-4">
    <div class="col">
      <h1 class="h2 fw-bold"><i class="fa-solid fa-arrows-rotate me-2 text-primary"></i>Article Spinner</h1>
      <p class="text-muted">Rewrite and paraphrase articles by replacing words with synonyms to create unique variations.</p>
    </div>
  </div>

  <div class="row g-4">
    <!-- Form -->
    <div class="col-lg-5">
      <div class="card shadow-sm border-0">
        <div class="card-body p-4">
          <h5 class="fw-semibold mb-4"><i class="fa-solid fa-file-alt me-2 text-primary"></i>Original Article</h5>

          <div class="mb-3">
            <label for="originalArticle" class="form-label fw-semibold">Paste Your Article <span class="text-danger">*</span></label>
            <textarea id="originalArticle" class="form-control" rows="12"
                      placeholder="Paste your article here…" required></textarea>
            <small id="wordCountOrig" class="text-muted">0 words</small>
          </div>

          <div class="mb-4">
            <label class="form-label fw-semibold">Spinning Level</label>
            <div class="d-flex flex-column gap-2">
              <div class="form-check">
                <input class="form-check-input" type="radio" name="spinLevel" id="spinLight" value="light" checked>
                <label class="form-check-label" for="spinLight">
                  <strong>Light</strong> <span class="text-muted small">— ~20% words replaced</span>
                </label>
              </div>
              <div class="form-check">
                <input class="form-check-input" type="radio" name="spinLevel" id="spinMedium" value="medium">
                <label class="form-check-label" for="spinMedium">
                  <strong>Medium</strong> <span class="text-muted small">— ~40% words replaced</span>
                </label>
              </div>
              <div class="form-check">
                <input class="form-check-input" type="radio" name="spinLevel" id="spinHeavy" value="heavy">
                <label class="form-check-label" for="spinHeavy">
                  <strong>Heavy</strong> <span class="text-muted small">— ~60% words replaced</span>
                </label>
              </div>
            </div>
          </div>

          <!-- Error Alert -->
          <div id="errorAlert" class="alert alert-danger d-none" role="alert">
            <i class="fa-solid fa-circle-xmark me-2"></i>
            <span id="errorMsg"></span>
          </div>

          <div class="d-grid">
            <button id="submitBtn" type="button" class="btn btn-primary btn-lg">
              <i class="fa-solid fa-arrows-rotate me-2"></i>Spin Article
            </button>
          </div>
        </div>
      </div>
    </div>

    <!-- Results -->
    <div class="col-lg-7">
      <!-- Loading -->
      <div id="loadingCard" class="card shadow-sm border-0 d-none">
        <div class="card-body p-5 text-center">
          <div class="spinner-border text-primary mb-3" style="width:3rem;height:3rem;" role="status">
            <span class="visually-hidden">Spinning...</span>
          </div>
          <p class="fw-semibold mb-0">Spinning article…</p>
          <p class="text-muted small">Replacing words with synonyms.</p>
        </div>
      </div>

      <!-- Results -->
      <div id="resultsSection" class="d-none">
        <!-- Stats -->
        <div class="row g-3 mb-4">
          <div class="col-4 text-center">
            <div class="card border-0 bg-light p-3">
              <div class="h4 fw-bold text-primary mb-0" id="changedCount">—</div>
              <small class="text-muted">Words Changed</small>
            </div>
          </div>
          <div class="col-4 text-center">
            <div class="card border-0 bg-light p-3">
              <div class="h4 fw-bold text-success mb-0" id="uniquenessPct">—</div>
              <small class="text-muted">Uniqueness</small>
            </div>
          </div>
          <div class="col-4 text-center">
            <div class="card border-0 bg-light p-3">
              <div class="h4 fw-bold text-info mb-0" id="spinLevelBadge">—</div>
              <small class="text-muted">Spin Level</small>
            </div>
          </div>
        </div>

        <!-- Side-by-side comparison -->
        <div class="row g-3 mb-3">
          <div class="col-md-6">
            <div class="card border-0 shadow-sm h-100">
              <div class="card-header fw-semibold"><i class="fa-solid fa-file-alt me-2 text-muted"></i>Original</div>
              <div class="card-body p-3">
                <div id="originalDisplay" class="small" style="max-height:350px;overflow-y:auto;white-space:pre-wrap;word-break:break-word;"></div>
              </div>
            </div>
          </div>
          <div class="col-md-6">
            <div class="card border-0 shadow-sm h-100">
              <div class="card-header fw-semibold d-flex justify-content-between align-items-center">
                <span><i class="fa-solid fa-arrows-rotate me-2 text-primary"></i>Spun Version</span>
                <button id="copySpunBtn" class="btn btn-sm btn-outline-secondary">
                  <i class="fa-solid fa-copy me-1"></i>Copy
                </button>
              </div>
              <div class="card-body p-3">
                <div id="spunDisplay" class="small" style="max-height:350px;overflow-y:auto;white-space:pre-wrap;word-break:break-word;"></div>
              </div>
            </div>
          </div>
        </div>
      </div>

      <!-- Placeholder -->
      <div id="placeholderCard" class="card border-0 bg-light">
        <div class="card-body p-5 text-center text-muted">
          <i class="fa-solid fa-arrows-rotate fa-3x mb-3 opacity-25"></i>
          <p class="mb-0">The original and spun article will appear side-by-side here.</p>
        </div>
      </div>
    </div>
  </div>
</div>
{% endblock %}

{% block scripts %}
<script>
(function () {
  'use strict';

  const submitBtn      = document.getElementById('submitBtn');
  const errorAlert     = document.getElementById('errorAlert');
  const errorMsg       = document.getElementById('errorMsg');
  const loadingCard    = document.getElementById('loadingCard');
  const resultsSection = document.getElementById('resultsSection');
  const placeholder    = document.getElementById('placeholderCard');
  const origText       = document.getElementById('originalArticle');
  const wordCountOrig  = document.getElementById('wordCountOrig');

  let spunText = '';

  origText.addEventListener('input', () => {
    const words = origText.value.trim().split(/\s+/).filter(Boolean).length;
    wordCountOrig.textContent = words + ' words';
  });

  function showError(msg) {
    errorMsg.textContent = msg;
    errorAlert.classList.remove('d-none');
    loadingCard.classList.add('d-none');
    placeholder.classList.remove('d-none');
    resultsSection.classList.add('d-none');
  }

  function escHtml(str) {
    return String(str).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
  }

  document.getElementById('copySpunBtn').addEventListener('click', () => {
    if (!spunText) return;
    navigator.clipboard.writeText(spunText).then(() => {
      const btn = document.getElementById('copySpunBtn');
      btn.innerHTML = '<i class="fa-solid fa-check text-success me-1"></i>Copied!';
      setTimeout(() => { btn.innerHTML = '<i class="fa-solid fa-copy me-1"></i>Copy'; }, 2000);
    });
  });

  submitBtn.addEventListener('click', async () => {
    const article   = origText.value.trim();
    const spinLevel = document.querySelector('input[name="spinLevel"]:checked').value;

    if (!article) { showError('Please paste an article to spin.'); return; }

    errorAlert.classList.add('d-none');
    loadingCard.classList.remove('d-none');
    resultsSection.classList.add('d-none');
    placeholder.classList.add('d-none');
    submitBtn.disabled = true;

    try {
      const resp = await fetch('/tools/webtools/article-spinner/spin', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ article, spin_level: spinLevel })
      });

      const data = await resp.json();
      if (!resp.ok) throw new Error(data.error || 'Server error ' + resp.status);

      spunText = data.spun_article || '';

      document.getElementById('changedCount').textContent  = data.words_changed ?? '—';
      document.getElementById('uniquenessPct').textContent = (data.uniqueness_pct ?? '—') + (data.uniqueness_pct !== undefined ? '%' : '');
      document.getElementById('spinLevelBadge').textContent = spinLevel.charAt(0).toUpperCase() + spinLevel.slice(1);

      document.getElementById('originalDisplay').textContent = article;
      document.getElementById('spunDisplay').innerHTML = highlightChanges(article, spunText);

      loadingCard.classList.add('d-none');
      resultsSection.classList.remove('d-none');
    } catch (err) {
      showError(err.message);
    } finally {
      submitBtn.disabled = false;
    }
  });

  function highlightChanges(original, spun) {
    // Simple word-level diff highlight
    const origWords = original.split(/(\s+)/);
    const spunWords = spun.split(/(\s+)/);
    let result = '';
    spunWords.forEach((token, i) => {
      if (/^\s+$/.test(token)) {
        result += escHtml(token);
      } else {
        const origToken = origWords[i] || '';
        if (token.toLowerCase() !== origToken.toLowerCase()) {
          result += `<mark class="bg-warning">${escHtml(token)}</mark>`;
        } else {
          result += escHtml(token);
        }
      }
    });
    return result;
  }
})();
</script>
{% endblock %}