<?php

namespace App\Models;

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

class KnowledgeItem extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'category_id',
        'item_type',
        'title',
        'content',
        'content_short',
        'tags',
        'language',
        'effective_date',
        'expiry_date',
        'is_active',
        'is_public',
        'qdrant_point_id',
        'is_embedded',
        'embedded_at',
        'created_by',
        'updated_by',
    ];

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

    // Type constants
    const TYPE_FAQ          = 'faq';
    const TYPE_POLICY       = 'policy';
    const TYPE_NOTE         = 'note';
    const TYPE_ANNOUNCEMENT = 'announcement';

    public static function typeLabels(): array
    {
        return [
            self::TYPE_FAQ          => 'FAQ / Soal Jawab',
            self::TYPE_POLICY       => 'Polisi / Prosedur',
            self::TYPE_NOTE         => 'Nota Dalaman',
            self::TYPE_ANNOUNCEMENT => 'Pengumuman',
        ];
    }

    // === Relationships ===

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

    public function scopePublic(Builder $query): Builder
    {
        return $query->where('is_public', true);
    }

    public function scopeByType(Builder $query, string $type): Builder
    {
        return $query->where('item_type', $type);
    }

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

    public function scopeNotEmbedded(Builder $query): Builder
    {
        return $query->where('is_embedded', false);
    }

    // === Helpers ===

    public function getTypeLabelAttribute(): string
    {
        return self::typeLabels()[$this->item_type] ?? $this->item_type;
    }

    /**
     * Bina teks yang akan di-embed — gabung title + content untuk FAQ
     */
    public function getEmbeddableText(): string
    {
        if ($this->item_type === self::TYPE_FAQ) {
            return "Soalan: {$this->title}\nJawapan: {$this->content}";
        }

        return "{$this->title}\n\n{$this->content}";
    }

    public function markAsEmbedded(string $qdrantPointId): void
    {
        $this->update([
            'qdrant_point_id' => $qdrantPointId,
            'is_embedded'     => true,
            'embedded_at'     => now(),
        ]);
    }

    public function deactivate(): void
    {
        $this->update(['is_active' => false]);
    }
}