<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;

class Classe extends Model
{
    use HasFactory;

    protected $fillable = ['etablissement_id', 'user_id', 'nom', 'formation', 'code_classe'];

    protected $casts = [
        'archivee_a' => 'datetime',
    ];

    protected static function booted(): void
    {
        static::creating(function (Classe $classe) {
            $classe->code_classe ??= static::genererCodeUnique();
        });
    }

    public static function genererCodeUnique(): string
    {
        do {
            $code = Str::upper(Str::random(6));
        } while (static::where('code_classe', $code)->exists());

        return $code;
    }

    public function etablissement(): BelongsTo
    {
        return $this->belongsTo(Etablissement::class);
    }

    public function prof(): BelongsTo
    {
        return $this->belongsTo(User::class, 'user_id');
    }

    public function eleves(): HasMany
    {
        return $this->hasMany(Eleve::class);
    }

    public function seances(): HasMany
    {
        return $this->hasMany(Seance::class);
    }

    public function estArchivee(): bool
    {
        return $this->archivee_a !== null;
    }

    /**
     * RGPD (CLAUDE.md) : une classe archivée et toutes les données de ses
     * élèves sont supprimées 90 jours après l'archivage (classes:purger-archivees).
     */
    public const DELAI_PURGE_JOURS = 90;

    public function supprimeeLe(): ?Carbon
    {
        return $this->archivee_a?->copy()->addDays(self::DELAI_PURGE_JOURS);
    }

    public function aDesLabsEnCours(): bool
    {
        return LabSession::whereIn('seance_id', $this->seances()->select('id'))
            ->whereIn('etat', [LabSession::ADMIS, LabSession::ACTIF])
            ->exists();
    }
}