package service

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	dtodomain "github.com/Caknoooo/go-gin-clean-starter/modules/uom/dto"
	"github.com/Caknoooo/go-gin-clean-starter/modules/uom/query"
	"github.com/Caknoooo/go-gin-clean-starter/modules/uom/repository"
	pkgdto "github.com/Caknoooo/go-gin-clean-starter/pkg/dto"
	"github.com/google/uuid"
	"gorm.io/gorm"
)

type UomService interface {
	Create(ctx context.Context, req dtodomain.UomCreateRequest) (dtodomain.UomResponse, error)
	GetById(ctx context.Context, uomId string) (dtodomain.UomResponse, error)
	GetAll(ctx context.Context, filter query.UomFilter) ([]dtodomain.UomResponse, int64, error)
	Update(ctx context.Context, req dtodomain.UomUpdateRequest, uomId string) (dtodomain.UomResponse, error)
	Delete(ctx context.Context, uomId string) error
}

type uomService struct {
	db      *gorm.DB
	uomRepo repository.UomRepository
}

func NewUomService(uomRepo repository.UomRepository, db *gorm.DB) UomService {
	return &uomService{
		uomRepo: uomRepo,
		db:      db,
	}
}

func (s *uomService) Create(ctx context.Context, req dtodomain.UomCreateRequest) (dtodomain.UomResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	uom := entities.MUomEntity{
		Name:         req.Name,
		Description:  req.Description,
		Symbol:       req.Symbol,
		Code:         req.Code,
		StdPrecision: req.StdPrecision,
		IsActive:     req.IsActive,
	}
	clientUUID, err := uuid.Parse(req.ClientID)
	if err != nil {
		tx.Rollback()
		return dtodomain.UomResponse{}, err
	}
	uom.ClientID = clientUUID
	created, err := s.uomRepo.Create(ctx, tx, uom)
	if err != nil {
		tx.Rollback()
		return dtodomain.UomResponse{}, err
	}
	tx.Commit()

	result, err := s.uomRepo.GetById(ctx, nil, created.ID.String())
	if err != nil {
		return dtodomain.UomResponse{}, err
	}
	return toUomResponse(result), nil
}

func (s *uomService) GetById(ctx context.Context, uomId string) (dtodomain.UomResponse, error) {
	uom, err := s.uomRepo.GetById(ctx, nil, uomId)
	if err != nil {
		return dtodomain.UomResponse{}, err
	}
	return toUomResponse(uom), nil
}

func (s *uomService) GetAll(ctx context.Context, filter query.UomFilter) ([]dtodomain.UomResponse, int64, error) {
	uoms, total, err := s.uomRepo.GetAll(ctx, filter)
	if err != nil {
		return nil, 0, err
	}
	var responses []dtodomain.UomResponse
	for _, u := range uoms {
		responses = append(responses, toUomResponse(u))
	}
	if responses == nil {
		responses = make([]dtodomain.UomResponse, 0)
	}
	return responses, total, nil
}

func (s *uomService) Update(ctx context.Context, req dtodomain.UomUpdateRequest, uomId string) (dtodomain.UomResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	uom, err := s.uomRepo.GetById(ctx, tx, uomId)
	if err != nil {
		tx.Rollback()
		return dtodomain.UomResponse{}, err
	}
	uom.Name = req.Name
	uom.Description = req.Description
	uom.Symbol = req.Symbol
	uom.Code = req.Code
	uom.StdPrecision = req.StdPrecision
	uom.IsActive = req.IsActive
	if req.ClientID != "" {
		clientUUID, err := uuid.Parse(req.ClientID)
		if err != nil {
			tx.Rollback()
			return dtodomain.UomResponse{}, err
		}
		uom.ClientID = clientUUID
		uom.Client = entities.M_Client{}
	} else {
		uom.Client = entities.M_Client{}
	}
	updated, err := s.uomRepo.Update(ctx, tx, uom)
	if err != nil {
		tx.Rollback()
		return dtodomain.UomResponse{}, err
	}
	tx.Commit()

	result, err := s.uomRepo.GetById(ctx, nil, updated.ID.String())
	if err != nil {
		return dtodomain.UomResponse{}, err
	}

	return toUomResponse(result), nil
}

func (s *uomService) Delete(ctx context.Context, uomId string) error {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	if err := s.uomRepo.Delete(ctx, tx, uomId); err != nil {
		tx.Rollback()
		return err
	}
	tx.Commit()
	return nil
}

func toUomResponse(e entities.MUomEntity) dtodomain.UomResponse {
	return dtodomain.UomResponse{
		ID:           e.ID.String(),
		Name:         e.Name,
		Description:  e.Description,
		Symbol:       e.Symbol,
		Code:         e.Code,
		StdPrecision: e.StdPrecision,
		IsActive:     e.IsActive,
		Client: pkgdto.ClientResponse{
			ID:   e.Client.ID.String(),
			Name: e.Client.Name,
		},
	}
}