{% extends 'base.html' %}

{% block title %}Backlink Opportunity Finder — 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') }}#seo">SEO Tools</a></li>
      <li class="breadcrumb-item active" aria-current="page">Backlink Opportunity Finder</li>
    </ol>
  </nav>

  <!-- Page Header -->
  <div class="row mb-4">
    <div class="col">
      <h1 class="h2 fw-bold"><i class="fa-solid fa-link me-2 text-success"></i>Backlink Opportunity Finder</h1>
      <p class="text-muted">Discover potential backlink sources in your niche based on your domain and target keywords.</p>
    </div>
  </div>

  <!-- Rate Limit Notice -->
  <div class="alert alert-warning d-flex align-items-start mb-4" role="alert">
    <i class="fa-solid fa-gauge-high me-3 mt-1 fs-5"></i>
    <div>
      <strong>Rate Limit Notice:</strong> To prevent abuse, this tool is limited to a certain number of searches per hour per IP address.
      Results are based on publicly crawlable data and may not reflect real-time link metrics.
    </div>
  </div>

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

          <div class="mb-3">
            <label for="domain" class="form-label fw-semibold">Your Domain / URL <span class="text-danger">*</span></label>
            <input type="text" id="domain" class="form-control"
                   placeholder="example.com or https://example.com" required>
            <div class="form-text">Enter your website's domain or URL.</div>
          </div>

          <div class="mb-4">
            <label for="nicheKeyword" class="form-label fw-semibold">Niche Keyword <span class="text-danger">*</span></label>
            <input type="text" id="nicheKeyword" class="form-control"
                   placeholder="e.g. digital marketing, fitness tips" required>
            <div class="form-text">Used to find relevant backlink sources in your niche.</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-success btn-lg">
              <i class="fa-solid fa-magnifying-glass me-2"></i>Find Opportunities
            </button>
          </div>
        </div>
      </div>
    </div>

    <!-- Results -->
    <div class="col-lg-8">
      <!-- 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-success mb-3" style="width:3rem;height:3rem;" role="status">
            <span class="visually-hidden">Searching...</span>
          </div>
          <p class="fw-semibold mb-0">Searching for backlink opportunities…</p>
          <p class="text-muted small">Scanning the web for relevant sources.</p>
        </div>
      </div>

      <!-- Results Table -->
      <div id="resultsSection" class="d-none">
        <div class="card shadow-sm border-0">
          <div class="card-header bg-success text-white fw-semibold d-flex justify-content-between align-items-center">
            <span><i class="fa-solid fa-list-check me-2"></i>Backlink Opportunities</span>
            <span id="resultCount" class="badge bg-light text-dark"></span>
          </div>
          <div class="card-body p-0">
            <div class="table-responsive">
              <table class="table table-hover table-striped mb-0 align-middle small">
                <thead class="table-dark">
                  <tr>
                    <th>#</th>
                    <th>Domain / URL</th>
                    <th class="text-center">Est. DA Score</th>
                    <th class="text-center">Relevance</th>
                    <th>Type</th>
                  </tr>
                </thead>
                <tbody id="backlinkTableBody"></tbody>
              </table>
            </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-link fa-3x mb-3 opacity-25"></i>
          <p class="mb-0">Backlink opportunities will appear here after the search.</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');

  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 relevanceBadge(score) {
    const s = parseFloat(score) || 0;
    let cls = 'bg-danger';
    if (s >= 0.7) cls = 'bg-success';
    else if (s >= 0.4) cls = 'bg-warning text-dark';
    const pct = Math.round(s * 100);
    return `<span class="badge ${cls}">${pct}%</span>`;
  }

  function daBadge(da) {
    const d = parseInt(da) || 0;
    let cls = 'text-danger';
    if (d >= 50) cls = 'text-success';
    else if (d >= 25) cls = 'text-warning';
    return `<strong class="${cls}">${d}</strong><small class="text-muted">/100</small>`;
  }

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

  submitBtn.addEventListener('click', async () => {
    const domain       = document.getElementById('domain').value.trim();
    const nicheKeyword = document.getElementById('nicheKeyword').value.trim();

    if (!domain)       { showError('Please enter your domain or URL.'); return; }
    if (!nicheKeyword) { showError('Please enter a niche keyword.'); 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/seo/backlink-finder/search', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ domain, niche_keyword: nicheKeyword })
      });

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

      const sources = data.sources || [];
      document.getElementById('resultCount').textContent = sources.length + ' found';

      const tbody = document.getElementById('backlinkTableBody');
      tbody.innerHTML = '';

      if (sources.length === 0) {
        tbody.innerHTML = '<tr><td colspan="5" class="text-center text-muted py-4">No opportunities found. Try a different keyword.</td></tr>';
      } else {
        sources.forEach((s, i) => {
          const tr = document.createElement('tr');
          tr.innerHTML = `
            <td class="text-muted">${i + 1}</td>
            <td><a href="${escHtml(s.url || '#')}" target="_blank" rel="noopener" class="text-break text-decoration-none">${escHtml(s.domain || s.url || '—')}</a></td>
            <td class="text-center">${daBadge(s.da_score)}</td>
            <td class="text-center">${relevanceBadge(s.relevance)}</td>
            <td><span class="badge bg-secondary">${escHtml(s.type || 'Web')}</span></td>`;
          tbody.appendChild(tr);
        });
      }

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