<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class PromotionQueue extends BaseModel
{
    protected $table = 'promotion_queue';

    protected $fillable = [
        'student_id',
        'from_class_section_id',
        'to_class_id',
        'to_class_section_id',
        'school_year_from',
        'school_year_to',
        'status',
        'created_at',
        'updated_at',
        'updated_by',
    ];

    public $timestamps = true;

    protected $casts = [
        'student_id' => 'integer',
        'from_class_section_id' => 'integer',
        'to_class_id' => 'integer',
        'to_class_section_id' => 'integer',
        'updated_by' => 'integer',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    /* ============================================================
     * Relationships (optional)
     * ============================================================
     */

    public function student(): BelongsTo
    {
        return $this->belongsTo(Student::class, 'student_id');
    }

    public function fromClassSection(): BelongsTo
    {
        return $this->belongsTo(ClassSection::class, 'from_class_section_id');
    }

    public function toClassSection(): BelongsTo
    {
        return $this->belongsTo(ClassSection::class, 'to_class_section_id');
    }

    public function toClass(): BelongsTo
    {
        return $this->belongsTo(SchoolClass::class, 'to_class_id'); // rename model if yours is ClassModel/ClassRoom/etc.
    }

    /* ============================================================
     * Scopes (reusable filters)
     * ============================================================
     */

    public function scopeForStudent(Builder $q, int $studentId): Builder
    {
        return $q->where('student_id', $studentId);
    }

    public function scopeForSchoolYearTo(Builder $q, string $schoolYearTo): Builder
    {
        return $q->where('school_year_to', $schoolYearTo);
    }

    public function scopeStatus(Builder $q, string $status): Builder
    {
        return $q->where('status', $status);
    }

    /* ============================================================
     * Upsert (Laravel style)
     * ============================================================
     */

    /**
     * True upsert by (student_id, school_year_to).
     *
     * Returns the saved model, or null if required keys missing.
     */
    public static function upsertQueue(array $data): ?self
    {
        $studentId = isset($data['student_id']) ? (int) $data['student_id'] : null;
        $yearTo = isset($data['school_year_to']) ? (string) $data['school_year_to'] : null;

        if (! $studentId || ! $yearTo) {
            return null;
        }

        // Only update columns that are allowed.
        $payload = array_intersect_key($data, array_flip((new static)->getFillable()));

        return static::updateOrCreate(
            ['student_id' => $studentId, 'school_year_to' => $yearTo],
            $payload
        );
    }

    /**
     * Optional: keep the same legacy signature (bool result).
     */
    public static function upsertBool(array $data): bool
    {
        return (bool) static::upsertQueue($data);
    }
}