<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * Chat Messenger élève ↔ prof de sa classe (règles d'Adam, 2026-10-13) :
 * un seul fil par élève, jamais de message privé entre élèves.
 */
class FilConversation extends Model
{
    protected $table = 'fils_conversation';

    protected $fillable = ['classe_id', 'eleve_id', 'lu_par_prof_a', 'lu_par_eleve_a'];

    protected $casts = [
        'lu_par_prof_a' => 'datetime',
        'lu_par_eleve_a' => 'datetime',
    ];

    /** @return BelongsTo<Classe, $this> */
    public function classe(): BelongsTo
    {
        return $this->belongsTo(Classe::class);
    }

    /** @return BelongsTo<Eleve, $this> */
    public function eleve(): BelongsTo
    {
        return $this->belongsTo(Eleve::class);
    }

    /** @return HasMany<MessageChat, $this> */
    public function messages(): HasMany
    {
        return $this->hasMany(MessageChat::class)->orderBy('created_at');
    }

    public function nonLusPourProf(): int
    {
        return $this->messages()
            ->where('expediteur', MessageChat::ELEVE)
            ->when($this->lu_par_prof_a, fn ($q) => $q->where('created_at', '>', $this->lu_par_prof_a))
            ->count();
    }

    public function nonLusPourEleve(): int
    {
        return $this->messages()
            ->where('expediteur', MessageChat::PROF)
            ->when($this->lu_par_eleve_a, fn ($q) => $q->where('created_at', '>', $this->lu_par_eleve_a))
            ->count();
    }
}