@extends('layouts.app')

@section('title', 'Matières — ' . $class->name)
@section('heading', 'Matières et professeurs')
@section('subheading', $class->name . ' — ' . $class->academicYear->name)

@section('content')
    <div class="mb-3 no-print">
        <a href="{{ route('classes.index') }}" class="btn btn-sm btn-outline-secondary">
            <i class="bi bi-arrow-left me-1"></i>Retour aux classes
        </a>
    </div>

    @if ($classSubjects->isEmpty())
        <div class="alert alert-danger">
            <i class="bi bi-exclamation-triangle me-2"></i>
            Cette classe n'a aucune matière. Le programme du niveau
            <strong>{{ $class->level->value }}</strong> est probablement vide pour cette année :
            complétez-le avant de pouvoir saisir des notes.
        </div>
    @else
        @php $unassigned = $classSubjects->whereNull('teacher_id')->count(); @endphp

        @if ($unassigned > 0)
            <div class="alert alert-warning d-flex gap-2 no-print">
                <i class="bi bi-exclamation-triangle"></i>
                <div>
                    <strong>{{ $unassigned }} matière{{ $unassigned > 1 ? 's' : '' }}</strong>
                    sans professeur. Un professeur ne peut saisir des notes que dans les matières
                    où il est affecté : sans affectation, personne ne pourra noter.
                </div>
            </div>
        @endif

        <form method="POST" action="{{ route('classes.subjects.save', $class) }}">
            @csrf
            @method('PUT')

            <div class="card">
                <div class="card-header bg-white d-flex justify-content-between align-items-center">
                    <span class="fw-semibold">
                        {{ $classSubjects->count() }} matière{{ $classSubjects->count() > 1 ? 's' : '' }} —
                        total des coefficients : <strong id="total-coef">{{ $classSubjects->sum('coefficient') }}</strong>
                    </span>
                    @can('assignTeachers', $class)
                        <button type="submit" class="btn btn-sm btn-primary no-print">
                            <i class="bi bi-check-lg me-1"></i>Enregistrer
                        </button>
                    @endcan
                </div>

                <div class="table-responsive">
                    <table class="table table-hover align-middle mb-0">
                        <thead>
                            <tr>
                                <th>Matière</th>
                                <th style="width: 8rem;">Coefficient</th>
                                <th style="width: 20rem;">Professeur</th>
                            </tr>
                        </thead>
                        <tbody>
                            @foreach ($classSubjects as $classSubject)
                                <tr @class(['table-warning' => ! $classSubject->teacher_id])>
                                    <td>
                                        <span class="fw-semibold">{{ $classSubject->subject->name }}</span>
                                        <div class="text-secondary small text-matricule">
                                            {{ $classSubject->subject->code }}
                                        </div>
                                    </td>
                                    <td>
                                        <input type="number" step="0.5" min="0.5" max="20"
                                               name="coefficients[{{ $classSubject->id }}]"
                                               value="{{ old("coefficients.{$classSubject->id}", $classSubject->coefficient) }}"
                                               class="form-control form-control-sm coef"
                                               @cannot('assignTeachers', $class) disabled @endcannot>
                                    </td>
                                    <td>
                                        <select name="teachers[{{ $classSubject->id }}]"
                                                class="form-select form-select-sm"
                                                @cannot('assignTeachers', $class) disabled @endcannot>
                                            <option value="">— Aucun professeur —</option>
                                            @foreach ($teachers as $teacher)
                                                <option value="{{ $teacher->id }}"
                                                    @selected(old("teachers.{$classSubject->id}", $classSubject->teacher_id) === $teacher->id)>
                                                    {{ $teacher->fullName() }}@if ($teacher->specialization) — {{ $teacher->specialization }} @endif
                                                </option>
                                            @endforeach
                                        </select>
                                    </td>
                                </tr>
                            @endforeach
                        </tbody>
                    </table>
                </div>

                <div class="card-footer bg-white small text-secondary">
                    <i class="bi bi-info-circle me-1"></i>
                    Le coefficient pondère la matière dans la moyenne générale. Il est repris du
                    programme du niveau, mais reste ajustable classe par classe.
                </div>
            </div>
        </form>

        <script>
            // Total des coefficients recalculé en direct : une erreur de saisie
            // fausse toutes les moyennes de la classe, autant la voir tout de suite.
            (() => {
                const champs = [...document.querySelectorAll('.coef')];
                const total = document.getElementById('total-coef');

                const recalculer = () => {
                    total.textContent = champs
                        .reduce((somme, champ) => somme + (parseFloat(champ.value) || 0), 0)
                        .toLocaleString('fr-FR', { maximumFractionDigits: 2 });
                };

                champs.forEach((champ) => champ.addEventListener('input', recalculer));
                recalculer();
            })();
        </script>
    @endif
@endsection