<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\Builder;

class Document extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'category_id',
        'title',
        'description',
        'status',
        'is_active',
        'effective_date',
        'expiry_date',
        'tags',
        'language',
        'created_by',
        'updated_by',
    ];

    protected $casts = [
        'is_active'      => 'boolean',
        'effective_date' => 'date',
        'expiry_date'    => 'date',
        'tags'           => 'array',
    ];

    // Status constants untuk kejelasan
    const STATUS_DRAFT      = 'draft';
    const STATUS_PROCESSING = 'processing';
    const STATUS_ACTIVE     = 'active';
    const STATUS_INACTIVE   = 'inactive';
    const STATUS_FAILED     = 'failed';

    // === Relationships ===

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

    public function versions(): HasMany
    {
        return $this->hasMany(DocumentVersion::class)->orderBy('version_number');
    }

    public function currentVersion(): HasOne
    {
        return $this->hasOne(DocumentVersion::class)->where('is_current', true);
    }

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

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

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

    // === Scopes ===

    public function scopeActive(Builder $query): Builder
    {
        return $query->where('is_active', true)->where('status', self::STATUS_ACTIVE);
    }

    public function scopeByCategory(Builder $query, int $categoryId): Builder
    {
        return $query->where('category_id', $categoryId);
    }

    // === Helpers ===

    public function getLatestVersionNumber(): int
    {
        return $this->versions()->max('version_number') ?? 0;
    }

    public function isProcessing(): bool
    {
        return $this->status === self::STATUS_PROCESSING;
    }
}