<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Casts\Attribute;

class Song extends Model
{
    use HasFactory;
    use SoftDeletes;

    protected $fillable = [
        'ccli_id',
        'title',
        'author',
        'copyright_text',
        'copyright_year',
        'publisher',
        'has_translation',
        'last_used_at',
    ];

    protected function casts(): array
    {
        return [
            'has_translation' => 'boolean',
            'last_used_at' => 'datetime',
        ];
    }

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

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

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

    /**
     * Letztes Service-Datum, in dem dieser Song verwendet wurde.
     * Berechnet über die service_songs -> services Verknüpfung.
     */
    public function lastUsedInService(): Attribute
    {
        return Attribute::get(function () {
            $latestDate = $this->serviceSongs()
                ->join('services', 'services.id', '=', 'service_songs.service_id')
                ->max('services.date');

            if ($latestDate === null) {
                return null;
            }

            // SQLite gibt date-Spalten als 'YYYY-MM-DD 00:00:00' zurück
            return substr((string) $latestDate, 0, 10);
        });
    }
}