<?php

namespace App\Models\Quote;

use App\Models\User;
use App\Traits\Auditable;
use App\Traits\BelongsToTenant;
use App\Traits\ModelTrait;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * 견적 수식 모델
 *
 * @property int $id
 * @property int $tenant_id
 * @property int $category_id
 * @property int|null $product_id
 * @property string $name
 * @property string $variable
 * @property string $type
 * @property string|null $formula
 * @property string $output_type
 * @property string|null $description
 * @property int $sort_order
 * @property bool $is_active
 */
class QuoteFormula extends Model
{
    use Auditable, BelongsToTenant, ModelTrait, SoftDeletes;

    protected $table = 'quote_formulas';

    protected $fillable = [
        'tenant_id',
        'category_id',
        'product_id',
        'name',
        'variable',
        'type',
        'formula',
        'output_type',
        'description',
        'sort_order',
        'is_active',
        'created_by',
        'updated_by',
    ];

    protected $casts = [
        'is_active' => 'boolean',
        'sort_order' => 'integer',
    ];

    protected $attributes = [
        'type' => 'calculation',
        'output_type' => 'variable',
        'sort_order' => 0,
        'is_active' => true,
    ];

    // 수식 유형 상수
    public const TYPE_INPUT = 'input';

    public const TYPE_CALCULATION = 'calculation';

    public const TYPE_RANGE = 'range';

    public const TYPE_MAPPING = 'mapping';

    // 출력 유형 상수
    public const OUTPUT_VARIABLE = 'variable';

    public const OUTPUT_ITEM = 'item';

    // =========================================================================
    // Relationships
    // =========================================================================

    /**
     * 카테고리 관계
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(QuoteFormulaCategory::class, 'category_id');
    }

    /**
     * 범위 규칙
     */
    public function ranges(): HasMany
    {
        return $this->hasMany(QuoteFormulaRange::class, 'formula_id')
            ->orderBy('sort_order');
    }

    /**
     * 매핑 규칙
     */
    public function mappings(): HasMany
    {
        return $this->hasMany(QuoteFormulaMapping::class, 'formula_id')
            ->orderBy('sort_order');
    }

    /**
     * 품목 출력
     */
    public function items(): HasMany
    {
        return $this->hasMany(QuoteFormulaItem::class, 'formula_id')
            ->orderBy('sort_order');
    }

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

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

    // =========================================================================
    // Scopes
    // =========================================================================

    /**
     * 수식이 공통 수식인지 확인
     */
    public function isCommon(): bool
    {
        return is_null($this->product_id);
    }

    /**
     * Scope: 공통 수식
     */
    public function scopeCommon(Builder $query): Builder
    {
        return $query->whereNull('product_id');
    }

    /**
     * Scope: 특정 제품 수식 (공통 + 제품 전용)
     */
    public function scopeForProduct(Builder $query, ?int $productId): Builder
    {
        return $query->where(function ($q) use ($productId) {
            $q->whereNull('product_id');
            if ($productId) {
                $q->orWhere('product_id', $productId);
            }
        });
    }

    /**
     * Scope: 활성화된 수식
     */
    public function scopeActive(Builder $query): Builder
    {
        return $query->where('is_active', true);
    }

    /**
     * Scope: 정렬 순서
     */
    public function scopeOrdered(Builder $query): Builder
    {
        return $query->orderBy('sort_order');
    }

    /**
     * Scope: 유형별 필터
     */
    public function scopeOfType(Builder $query, string $type): Builder
    {
        return $query->where('type', $type);
    }

    // =========================================================================
    // Helper Methods
    // =========================================================================

    /**
     * 유형 레이블 조회
     */
    public function getTypeLabelAttribute(): string
    {
        return match ($this->type) {
            self::TYPE_INPUT => '입력값',
            self::TYPE_CALCULATION => '계산식',
            self::TYPE_RANGE => '범위별',
            self::TYPE_MAPPING => '매핑',
            default => $this->type,
        };
    }

    /**
     * 출력 유형 레이블 조회
     */
    public function getOutputTypeLabelAttribute(): string
    {
        return match ($this->output_type) {
            self::OUTPUT_VARIABLE => '변수',
            self::OUTPUT_ITEM => '품목',
            default => $this->output_type,
        };
    }
}