package specificPriceService

import (
	"context"

	"git.ma-al.com/goc_daniel/b2b/app/model"
	"git.ma-al.com/goc_daniel/b2b/app/repos/specificPriceRepo"
	"git.ma-al.com/goc_daniel/b2b/app/utils/responseErrors"
)

type SpecificPriceService struct {
	specificPriceRepo specificPriceRepo.UISpecificPriceRepo
}

func New() *SpecificPriceService {
	return &SpecificPriceService{
		specificPriceRepo: specificPriceRepo.New(),
	}
}

func (s *SpecificPriceService) Create(ctx context.Context, pr *model.SpecificPrice) (*model.SpecificPrice, error) {
	if err := s.validateRequest(pr); err != nil {
		return nil, err
	}

	if pr.Scope == "shop" && len(pr.ProductIDs) == 0 && len(pr.CategoryIDs) == 0 && len(pr.ProductAttributeIDs) == 0 && len(pr.CountryIDs) == 0 && len(pr.CustomerIDs) == 0 {
		// pr.Scope = "global"
	} else {
		// pr.Scope = "scoped"
	}

	if err := s.specificPriceRepo.Create(ctx, pr); err != nil {
		return nil, err
	}

	return pr, nil
}

func (s *SpecificPriceService) Update(ctx context.Context, id uint64, pr *model.SpecificPrice) (*model.SpecificPrice, error) {
	existing, err := s.specificPriceRepo.GetByID(ctx, id)
	if err != nil {
		return nil, err
	}
	if existing == nil {
		return nil, responseErrors.ErrSpecificPriceNotFound
	}

	if err := s.validateUpdateRequest(pr); err != nil {
		return nil, err
	}

	pr.ID = id

	if pr.Scope == "shop" && len(pr.ProductIDs) == 0 && len(pr.CategoryIDs) == 0 && len(pr.ProductAttributeIDs) == 0 && len(pr.CountryIDs) == 0 && len(pr.CustomerIDs) == 0 {
		// pr.Scope = "global"
	} else {
		// pr.Scope = "scoped"
	}

	if err := s.specificPriceRepo.Update(ctx, pr); err != nil {
		return nil, err
	}

	return pr, nil
}

func (s *SpecificPriceService) GetByID(ctx context.Context, id uint64) (*model.SpecificPrice, error) {
	pr, err := s.specificPriceRepo.GetByID(ctx, id)
	if err != nil {
		return nil, err
	}
	if pr == nil {
		return nil, responseErrors.ErrSpecificPriceNotFound
	}
	return pr, nil
}

func (s *SpecificPriceService) List(ctx context.Context) ([]*model.SpecificPrice, error) {
	return s.specificPriceRepo.List(ctx)
}

func (s *SpecificPriceService) SetActive(ctx context.Context, id uint64, active bool) error {
	pr, err := s.specificPriceRepo.GetByID(ctx, id)
	if err != nil {
		return err
	}
	if pr == nil {
		return responseErrors.ErrSpecificPriceNotFound
	}

	return s.specificPriceRepo.SetActive(ctx, id, active)
}

func (s *SpecificPriceService) Delete(ctx context.Context, id uint64) error {
	pr, err := s.specificPriceRepo.GetByID(ctx, id)
	if err != nil {
		return err
	}
	if pr == nil {
		return responseErrors.ErrSpecificPriceNotFound
	}

	return s.specificPriceRepo.Delete(ctx, id)
}

func (s *SpecificPriceService) validateRequest(pr *model.SpecificPrice) error {
	if pr.ReductionType != "amount" && pr.ReductionType != "percentage" {
		return responseErrors.ErrInvalidReductionType
	}

	if pr.ReductionType == "percentage" && pr.PercentageReduction == nil {
		return responseErrors.ErrPercentageRequired
	}

	if pr.ReductionType == "amount" && pr.Price == nil {
		return responseErrors.ErrPriceRequired
	}

	return nil
}

func (s *SpecificPriceService) validateUpdateRequest(pr *model.SpecificPrice) error {
	if pr.ReductionType != "" && pr.ReductionType != "amount" && pr.ReductionType != "percentage" {
		return responseErrors.ErrInvalidReductionType
	}

	if pr.ReductionType == "percentage" && pr.PercentageReduction == nil {
		return responseErrors.ErrPercentageRequired
	}

	if pr.ReductionType == "amount" && pr.Price == nil {
		return responseErrors.ErrPriceRequired
	}

	return nil
}