<?php

namespace App\Models\Barobill;

use Illuminate\Database\Eloquent\Model;

/**
 * 바로빌 과금 정책 모델
 *
 * @property int $id
 * @property string $service_type 서비스 유형 (card, tax_invoice, bank_account)
 * @property string $name 정책명
 * @property string|null $description 설명
 * @property int $free_quota 무료 기본 제공량
 * @property string $free_quota_unit 무료 제공 단위
 * @property int $additional_unit 추가 과금 단위
 * @property string $additional_unit_label 추가 단위 라벨
 * @property int $additional_price 추가 과금 금액
 * @property bool $is_active 활성화 여부
 * @property int $sort_order 정렬 순서
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 */
class BarobillPricingPolicy extends Model
{
    protected $table = 'barobill_pricing_policies';

    protected $fillable = [
        'service_type',
        'name',
        'description',
        'free_quota',
        'free_quota_unit',
        'additional_unit',
        'additional_unit_label',
        'additional_price',
        'is_active',
        'sort_order',
    ];

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

    /**
     * 서비스 유형 상수
     */
    public const TYPE_CARD = 'card';

    public const TYPE_TAX_INVOICE = 'tax_invoice';

    public const TYPE_BANK_ACCOUNT = 'bank_account';

    /**
     * 서비스 유형 라벨
     */
    public static function getServiceTypeLabels(): array
    {
        return [
            self::TYPE_CARD => '법인카드 등록',
            self::TYPE_TAX_INVOICE => '계산서 발행',
            self::TYPE_BANK_ACCOUNT => '계좌조회 수집',
        ];
    }

    /**
     * 서비스 유형 라벨 Accessor
     */
    public function getServiceTypeLabelAttribute(): string
    {
        return self::getServiceTypeLabels()[$this->service_type] ?? $this->service_type;
    }

    /**
     * 활성화된 정책만 조회
     */
    public function scopeActive($query)
    {
        return $query->where('is_active', true);
    }

    /**
     * 서비스 유형별 정책 조회
     */
    public static function getByServiceType(string $serviceType): ?self
    {
        return static::where('service_type', $serviceType)
            ->where('is_active', true)
            ->first();
    }

    /**
     * 모든 활성 정책 조회 (캐시)
     */
    public static function getAllActive(): \Illuminate\Database\Eloquent\Collection
    {
        return static::active()
            ->orderBy('sort_order')
            ->get();
    }

    /**
     * 추가 과금액 계산
     *
     * @param  int  $usageCount  사용량
     * @return array ['free_count' => int, 'billable_count' => int, 'billable_amount' => int]
     */
    public function calculateBilling(int $usageCount): array
    {
        // 무료 제공량 초과분
        $excessCount = max(0, $usageCount - $this->free_quota);

        if ($excessCount === 0 || $this->additional_price === 0) {
            return [
                'free_count' => min($usageCount, $this->free_quota),
                'billable_count' => 0,
                'billable_amount' => 0,
            ];
        }

        // 추가 과금 단위에 따른 계산
        // 예: 50건 단위면 51건도 100건도 동일하게 1단위 과금
        $billableUnits = ceil($excessCount / $this->additional_unit);
        $billableAmount = (int) ($billableUnits * $this->additional_price);

        return [
            'free_count' => $this->free_quota,
            'billable_count' => $excessCount,
            'billable_amount' => $billableAmount,
        ];
    }

    /**
     * 정책 설명 문자열 생성
     */
    public function getPolicyDescriptionAttribute(): string
    {
        $parts = [];

        if ($this->free_quota > 0) {
            $parts[] = "기본 {$this->free_quota}{$this->free_quota_unit} 무료";
        }

        if ($this->additional_price > 0) {
            $priceFormatted = number_format($this->additional_price);
            if ($this->additional_unit > 1) {
                $parts[] = "추가 {$this->additional_unit}{$this->additional_unit_label} 단위 {$priceFormatted}원";
            } else {
                $parts[] = "추가 1{$this->additional_unit_label}당 {$priceFormatted}원";
            }
        }

        return implode(', ', $parts);
    }
}