@extends('layouts.app')
@section('content')
<div class="d-flex justify-content-between align-items-center mb-3">
  <div>
    <h4 class="m-0">{{ $exam->title }}</h4>
    <div class="text-muted small">زمان باقی‌مانده: <span id="remain">—</span></div>
  </div>
  <form method="POST" action="{{ route('student.attempts.submit', $attempt) }}" onsubmit="return confirm('ثبت نهایی؟ بعد از ثبت امکان ویرایش نیست.')">
    @csrf
    <button class="btn btn-danger">ثبت نهایی</button>
  </form>
</div>

<div class="card rounded-4 p-3">
  <ol class="m-0">
    @foreach($questions as $q)
      @php($a = $saved->get($q->id))
      @php($chosen = (int)($a->answer_json['choice_id'] ?? 0))
      <li class="mb-4">
        <div class="mb-2">{{ $q->body }}</div>
        <div class="row g-2">
          @foreach($q->choices as $c)
            <div class="col-12">
              <label class="w-100 border rounded-3 p-2 d-flex align-items-center gap-2" style="cursor:pointer">
                <input type="radio" name="q_{{ $q->id }}" value="{{ $c->id }}" @checked($chosen===$c->id) data-qid="{{ $q->id }}" class="form-check-input m-0">
                <span>{{ $c->text }}</span>
              </label>
            </div>
          @endforeach
        </div>
        <div class="small text-muted mt-2" id="saved_{{ $q->id }}"></div>
      </li>
    @endforeach
  </ol>
</div>

@push('scripts')
<script>
(function(){
  const expiresAt = new Date("{{ $attempt->expires_at->toIso8601String() }}").getTime();
  const remainEl = document.getElementById('remain');

  function tick(){
    const now = Date.now();
    let diff = Math.max(0, expiresAt - now);
    const sec = Math.floor(diff/1000);
    const m = Math.floor(sec/60);
    const s = sec % 60;
    remainEl.textContent = m + ":" + String(s).padStart(2,'0');
    if(diff <= 0){
      alert('زمان آزمون تمام شد. صفحه رفرش می‌شود.');
      window.location.reload();
    }
  }
  setInterval(tick, 1000); tick();

  async function autosave(qid, choiceId){
    const res = await fetch("{{ route('student.attempts.autosave', $attempt) }}", {
      method: "POST",
      headers: {
        "Content-Type":"application/json",
        "X-CSRF-TOKEN": "{{ csrf_token() }}",
        "Accept":"application/json"
      },
      body: JSON.stringify({question_id: qid, choice_id: choiceId})
    });
    if(!res.ok) return;
    const data = await res.json();
    const el = document.getElementById('saved_' + qid);
    if(el) el.textContent = "ذخیره شد: " + new Date(data.ts).toLocaleTimeString('fa-IR');
  }

  document.querySelectorAll('input[type="radio"][data-qid]').forEach(r=>{
    r.addEventListener('change', (e)=>{
      autosave(e.target.getAttribute('data-qid'), e.target.value);
    });
  });

  // Basic anti-cheat signal (not a strong protection)
  let blurCount = 0;
  window.addEventListener('blur', ()=>{ blurCount++; });
})();
</script>
@endpush
@endsection