package service

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	"github.com/Caknoooo/go-gin-clean-starter/modules/mvendor/dto"
	"github.com/Caknoooo/go-gin-clean-starter/modules/mvendor/query"
	"github.com/Caknoooo/go-gin-clean-starter/modules/mvendor/repository"
	sequenceservice "github.com/Caknoooo/go-gin-clean-starter/modules/sequence/service"
	pkgdto "github.com/Caknoooo/go-gin-clean-starter/pkg/dto"
	"github.com/Caknoooo/go-gin-clean-starter/pkg/utils"
	"github.com/google/uuid"
	"gorm.io/gorm"
)

type VendorService interface {
	Create(ctx context.Context, req dto.VendorCreateRequest) (dto.VendorResponse, error)
	GetById(ctx context.Context, vendorId string) (dto.VendorResponse, error)
	GetAll(ctx context.Context, filter query.VendorFilter) ([]dto.VendorResponse, int64, error)
	Update(ctx context.Context, req dto.VendorUpdateRequest, vendorId string) (dto.VendorResponse, error)
	Delete(ctx context.Context, vendorId string) error
}

type vendorService struct {
	db              *gorm.DB
	vendorRepo      repository.VendorRepository
	sequenceService sequenceservice.SequenceService
}

func NewVendorService(vendorRepo repository.VendorRepository, sequenceService sequenceservice.SequenceService, db *gorm.DB) VendorService {
	return &vendorService{
		vendorRepo:      vendorRepo,
		sequenceService: sequenceService,
		db:              db,
	}
}

func (s *vendorService) Create(ctx context.Context, req dto.VendorCreateRequest) (dto.VendorResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	suffix := utils.GetInitials(req.Name)

	seqConfig := pkgdto.SequenceConfig{
		EntityType: "vendor",
		Prefix:     "VND",
		Period:     "",
	}

	searchKey, err := s.sequenceService.GenerateNumberWithSuffix(ctx, req.ClientID, seqConfig, suffix)
	if err != nil {
		tx.Rollback()
		return dto.VendorResponse{}, err
	}

	vendor := entities.MVendorEntity{
		SearchKey:     searchKey,
		Name:          req.Name,
		Address:       req.Address,
		ContactPerson: req.ContactPerson,
		IsActive:      req.IsActive,
	}
	clientUUID, err := uuid.Parse(req.ClientID)
	if err != nil {
		tx.Rollback()
		return dto.VendorResponse{}, err
	}
	vendor.ClientID = clientUUID
	created, err := s.vendorRepo.Create(ctx, tx, vendor)
	if err != nil {
		tx.Rollback()
		return dto.VendorResponse{}, err
	}
	tx.Commit()
	return entityToVendorResponse(created), nil
}

func (s *vendorService) GetById(ctx context.Context, vendorId string) (dto.VendorResponse, error) {
	vendor, err := s.vendorRepo.GetById(ctx, nil, vendorId)
	if err != nil {
		return dto.VendorResponse{}, err
	}
	return entityToVendorResponse(vendor), nil
}

func (s *vendorService) GetAll(ctx context.Context, filter query.VendorFilter) ([]dto.VendorResponse, int64, error) {
	vendors, total, err := s.vendorRepo.GetAll(ctx, filter)
	if err != nil {
		return nil, 0, err
	}
	responses := make([]dto.VendorResponse, len(vendors))
	for i, v := range vendors {
		responses[i] = entityToVendorResponse(v)
	}
	return responses, total, nil
}

func (s *vendorService) Update(ctx context.Context, req dto.VendorUpdateRequest, vendorId string) (dto.VendorResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	vendor, err := s.vendorRepo.GetById(ctx, tx, vendorId)
	if err != nil {
		tx.Rollback()
		return dto.VendorResponse{}, err
	}
	if req.Name != "" {
		vendor.Name = req.Name
	}
	if req.Address != "" {
		vendor.Address = req.Address
	}
	if req.ContactPerson != "" {
		vendor.ContactPerson = req.ContactPerson
	}
	vendor.IsActive = req.IsActive
	if req.ClientID != "" {
		clientUUID, err := uuid.Parse(req.ClientID)
		if err != nil {
			tx.Rollback()
			return dto.VendorResponse{}, err
		}
		vendor.ClientID = clientUUID
	}
	updated, err := s.vendorRepo.Update(ctx, tx, vendor)
	if err != nil {
		tx.Rollback()
		return dto.VendorResponse{}, err
	}
	tx.Commit()
	return entityToVendorResponse(updated), nil
}

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

func entityToVendorResponse(e entities.MVendorEntity) dto.VendorResponse {

	return dto.VendorResponse{
		ID:            e.ID.String(),
		SearchKey:     e.SearchKey,
		Name:          e.Name,
		Address:       e.Address,
		ContactPerson: e.ContactPerson,
		IsActive:      e.IsActive,
		Client: pkgdto.IdNameResponse{
			ID:   e.ClientID.String(),
			Name: e.Client.Name,
		},
	}
}