@extends('layouts.school')
@section('title', 'Examination Candidates')
@section('header', 'Examination Candidates')

@section('content')
    <div class="mb-6">
        <form method="GET" class="flex max-w-md items-end gap-3">
            <div class="flex-1">
                <label for="exam_id" class="block text-xs font-medium text-gray-700">Select Examination</label>
                <select name="exam_id" id="exam_id" onchange="this.form.submit()" class="mt-1 block w-full rounded-lg border border-gray-300 px-3 py-2 text-sm shadow-sm focus:border-primary-500 focus:outline-none focus:ring-1 focus:ring-primary-500">
                    <option value="">-- Choose exam --</option>
                    @foreach ($exams as $e)
                        <option value="{{ $e->id }}" {{ $exam && $exam->id === $e->id ? 'selected' : '' }}>
                            {{ $e->name }} ({{ $e->classroom?->name ?? '—' }})
                        </option>
                    @endforeach
                </select>
            </div>
        </form>
    </div>

    @if ($exam)
        <div class="mb-6 rounded-xl bg-white p-6 shadow-sm ring-1 ring-gray-900/5">
            <div class="flex items-center justify-between">
                <div>
                    <h2 class="text-lg font-semibold text-gray-900">{{ $exam->name }}</h2>
                    <p class="text-sm text-gray-500">
                        {{ $exam->classroom?->name ?? 'No class' }} ·
                        {{ number_format($candidates->count()) }} candidate(s) registered
                    </p>
                </div>
            </div>

            @if ($enrolledStudents->isNotEmpty())
                <form method="POST" action="{{ route('school.exams.candidates.store', $schoolId) }}" class="mt-6 border-t border-gray-100 pt-5">
                    @csrf
                    <input type="hidden" name="exam_id" value="{{ $exam->id }}">
                    <div class="mb-3 flex items-center justify-between">
                        <h3 class="text-sm font-semibold text-gray-900">Add Candidates ({{ $enrolledStudents->count() }} available from {{ $exam->classroom?->name }})</h3>
                        <button type="submit" class="rounded-lg bg-primary-600 px-4 py-2 text-sm font-semibold text-white shadow-sm hover:bg-primary-700">+ Add Selected</button>
                    </div>
                    <div class="max-h-72 overflow-y-auto rounded-lg border border-gray-200">
                        @foreach ($enrolledStudents as $student)
                            <label class="flex cursor-pointer items-center gap-3 border-b border-gray-100 px-4 py-2.5 last:border-0 hover:bg-gray-50">
                                <input type="checkbox" name="student_ids[]" value="{{ $student->id }}" class="rounded border-gray-300 text-primary-600 focus:ring-primary-500">
                                <span class="text-sm font-medium text-gray-900">{{ $student->first_name }} {{ $student->last_name }}</span>
                                <span class="text-xs text-gray-500">#{{ $student->admission_no ?? 'N/A' }}</span>
                            </label>
                        @endforeach
                    </div>
                </form>
            @else
                <div class="mt-6 rounded-lg bg-gray-50 px-4 py-6 text-center text-sm text-gray-500">
                    @if ($candidates->isEmpty())
                        No students available. All students in {{ $exam->classroom?->name }} are already registered or none exist.
                    @else
                        All students in {{ $exam->classroom?->name }} are registered as candidates.
                    @endif
                </div>
            @endif
        </div>

        <div class="rounded-xl bg-white shadow-sm ring-1 ring-gray-900/5 overflow-hidden">
            <div class="border-b border-gray-200 px-6 py-4">
                <h3 class="text-sm font-semibold text-gray-900">Registered Candidates</h3>
            </div>
            <table class="min-w-full divide-y divide-gray-200">
                <thead class="bg-gray-50">
                    <tr>
                        <th class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase">Student</th>
                        <th class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase">Admission No</th>
                        <th class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase">Class</th>
                        <th class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase">Actions</th>
                    </tr>
                </thead>
                <tbody class="divide-y divide-gray-100">
                    @forelse($candidates as $candidate)
                        <tr class="hover:bg-gray-50">
                            <td class="px-6 py-4 text-sm font-medium text-gray-900">{{ $candidate->student?->first_name }} {{ $candidate->student?->last_name }}</td>
                            <td class="px-6 py-4 text-sm text-gray-600">{{ $candidate->student?->admission_no ?? '—' }}</td>
                            <td class="px-6 py-4 text-sm text-gray-600">{{ $candidate->student?->classroom?->name ?? '—' }}</td>
                            <td class="px-6 py-4">
                                <form method="POST" action="{{ route('school.exams.candidates.destroy', [$schoolId, $candidate->id]) }}" onsubmit="return confirm('Remove this candidate?')">
                                    @csrf
                                    @method('DELETE')
                                    <button type="submit" class="text-xs font-medium text-red-600 hover:text-red-700">Remove</button>
                                </form>
                            </td>
                        </tr>
                    @empty
                        <tr><td colspan="4" class="px-6 py-12 text-center text-sm text-gray-500">No candidates registered yet.</td></tr>
                    @endforelse
                </tbody>
            </table>
        </div>
    @else
        <div class="rounded-xl bg-white p-12 text-center shadow-sm ring-1 ring-gray-900/5">
            <p class="text-sm text-gray-500">Select an examination to manage its candidates.</p>
        </div>
    @endif
@endsection