{% extends "admin/base_site.html" %}
{% load i18n %}
{% block title %}{{ title }}{% endblock %}
{% block extrahead %}
{{ block.super }}
<style>
  .diff-container { display: flex; gap: 0; font-family: 'SF Mono', 'Consolas', 'Monaco', monospace; font-size: 12px; border: 1px solid #d0d7de; border-radius: 6px; overflow: hidden; background: #fff; }
  .diff-panel { flex: 1; overflow: auto; max-height: 78vh; }
  .diff-panel-header { position: sticky; top: 0; z-index: 10; background: #f6f8fa; padding: 10px 16px; font-weight: 600; font-size: 13px; border-bottom: 1px solid #d0d7de; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; color: #24292f; }
  .diff-panel:not(:last-child) { border-right: 1px solid #d0d7de; }
  .diff-line { display: flex; padding: 0 12px; min-height: 22px; line-height: 22px; white-space: pre; }
  .diff-line-num { color: #656d76; width: 45px; text-align: right; padding-right: 12px; flex-shrink: 0; user-select: none; font-size: 11px; }
  .diff-line-content { flex: 1; }
  .diff-added { background: #ccffd8; color: #116329; }
  .diff-removed { background: #ffd7d5; color: #82071e; }
  .diff-line:hover { background: #eaeef2; }
  .diff-added:hover { background: #aff5b4; }
  .diff-removed:hover { background: #ffb8b0; }
  .summary-panel { background: #f6f8fa; border: 1px solid #d0d7de; border-radius: 6px; padding: 20px; margin-bottom: 20px; }
  .summary-panel h3 { margin: 0 0 14px; font-size: 16px; color: #24292f; }
  .summary-item { padding: 5px 0; font-size: 14px; color: #24292f; }
  .summary-item .badge { display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 12px; margin-right: 8px; vertical-align: middle; }
  .badge-added { background: #1a7f37; color: #fff; }
  .badge-removed { background: #cf222e; color: #fff; }
  .badge-changed { background: #9a6700; color: #fff; }
  .badge-identical { background: #6e7781; color: #fff; }
  .badge-meta { background: #0969da; color: #fff; }
  .diff-toggle-bar { margin: 16px 0; display: flex; gap: 0; border: 1px solid #d0d7de; border-radius: 6px; overflow: hidden; width: fit-content; }
  .diff-toggle-bar button { padding: 8px 18px; border: none; border-right: 1px solid #d0d7de; cursor: pointer; background: #f6f8fa; font-size: 13px; font-weight: 500; color: #24292f; transition: background 0.15s; }
  .diff-toggle-bar button:last-child { border-right: none; }
  .diff-toggle-bar button:hover { background: #eaeef2; }
  .diff-toggle-bar button.active { background: #0969da; color: #fff; }
</style>
{% endblock %}
{% block content %}
<h2 style="margin-bottom: 16px;">{{ title }}</h2>
{% if summary %}
{% for s in summary %}
<div class="summary-panel">
  <h3>{% if s.identical %}<span class="badge badge-identical">Identical</span> {% endif %}{{ s.left }} ↔ {{ s.right }}</h3>
  {% if s.diffs %}
  <div>
    {% for d in s.diffs %}
    <div class="summary-item">
      {% if "added" in d|lower %}<span class="badge badge-added">+</span>{% elif "removed" in d|lower %}<span class="badge badge-removed">−</span>{% elif "modified" in d|lower or "→" in d %}<span class="badge badge-changed">Δ</span>{% else %}<span class="badge badge-meta">ℹ</span>{% endif %}
      {{ d }}
    </div>
    {% endfor %}
  </div>
  {% else %}<p style="color: #6e7781; margin: 0;">The two forms are identical.</p>{% endif %}
</div>
{% endfor %}
{% endif %}
<div class="diff-toggle-bar">
  <button id="btn-side" class="active">Side by Side</button>
  <button id="btn-inline">Inline</button>
  <button id="btn-raw">Raw JSON</button>
</div>
<div id="diff-output"></div>
<div id="raw-panels" style="display:none;">
  <div class="diff-container">
    {% for f in forms_json %}
    <div class="diff-panel">
      <div class="diff-panel-header">{{ f.name }} ({{ f.slug }})</div>
      <pre style="margin:0;padding:12px;font-size:12px;white-space:pre-wrap;color:#24292f;">{{ f.json }}</pre>
    </div>
    {% endfor %}
  </div>
</div>
<script src="https://cdn.jsdelivr.net/npm/diff@5.2.0/dist/diff.min.js"></script>
<script>
(function() {
  var formsJson = {{ forms_json_escaped|safe }};
  var formNames = {{ form_names|safe }};
  function esc(s) { return s.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }
  function sideBySide(a, b, nA, nB) {
    var d = Diff.diffLines(a, b), L = [], R = [], ln = 0, rn = 0;
    d.forEach(function(p) {
      p.value.replace(/\n$/, '').split('\n').forEach(function(line) {
        if (p.added) { rn++; L.push({n:'',t:'',c:'diff-removed'}); R.push({n:rn,t:line,c:'diff-added'}); }
        else if (p.removed) { ln++; L.push({n:ln,t:line,c:'diff-removed'}); R.push({n:'',t:'',c:'diff-added'}); }
        else { ln++; rn++; L.push({n:ln,t:line,c:''}); R.push({n:rn,t:line,c:''}); }
      });
    });
    var h = '<div class="diff-container">';
    h += '<div class="diff-panel"><div class="diff-panel-header">'+esc(nA)+'</div>';
    L.forEach(function(l){h+='<div class="diff-line '+l.c+'"><span class="diff-line-num">'+l.n+'</span><span class="diff-line-content">'+esc(l.t)+'</span></div>';});
    h += '</div><div class="diff-panel"><div class="diff-panel-header">'+esc(nB)+'</div>';
    R.forEach(function(l){h+='<div class="diff-line '+l.c+'"><span class="diff-line-num">'+l.n+'</span><span class="diff-line-content">'+esc(l.t)+'</span></div>';});
    return h + '</div></div>';
  }
  function inlineDiff(a, b, nA, nB) {
    var d = Diff.diffLines(a, b), num = 0;
    var h = '<div class="diff-container" style="display:block;"><div class="diff-panel" style="max-height:78vh;">';
    h += '<div class="diff-panel-header">'+esc(nA)+' ↔ '+esc(nB)+'</div>';
    d.forEach(function(p) {
      var cls = p.added?'diff-added':p.removed?'diff-removed':'';
      var pfx = p.added?'+':p.removed?'-':' ';
      p.value.replace(/\n$/, '').split('\n').forEach(function(line) {
        if (!p.added && !p.removed) num++;
        h += '<div class="diff-line '+cls+'"><span class="diff-line-num">'+(cls?'':num)+'</span><span class="diff-line-content">'+pfx+' '+esc(line)+'</span></div>';
      });
    });
    return h + '</div></div>';
  }
  function setMode(mode) {
    document.getElementById('btn-side').classList.toggle('active', mode==='side');
    document.getElementById('btn-inline').classList.toggle('active', mode==='inline');
    document.getElementById('btn-raw').classList.toggle('active', mode==='raw');
    document.getElementById('raw-panels').style.display = mode==='raw'?'':'none';
    var out = document.getElementById('diff-output');
    if (mode==='raw') { out.innerHTML=''; return; }
    var h = '';
    for (var i=1; i<formsJson.length; i++) {
      h += mode==='side' ? sideBySide(formsJson[0],formsJson[i],formNames[0],formNames[i]) : inlineDiff(formsJson[0],formsJson[i],formNames[0],formNames[i]);
      if (i<formsJson.length-1) h+='<hr style="margin:16px 0;border-color:#d0d7de;">';
    }
    out.innerHTML = h;
  }
  document.getElementById('btn-side').addEventListener('click', function(){setMode('side');});
  document.getElementById('btn-inline').addEventListener('click', function(){setMode('inline');});
  document.getElementById('btn-raw').addEventListener('click', function(){setMode('raw');});
  setMode('side');
})();
</script>
{% endblock %}