package service

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	dtodomain "github.com/Caknoooo/go-gin-clean-starter/modules/inventory_issue/dto"
	"github.com/Caknoooo/go-gin-clean-starter/modules/inventory_issue/query"
	"github.com/Caknoooo/go-gin-clean-starter/modules/inventory_issue/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 InventoryIssueService interface {
	Create(ctx context.Context, req dtodomain.InventoryIssueCreateRequest) (dtodomain.InventoryIssueResponse, error)
	GetById(ctx context.Context, id string) (dtodomain.InventoryIssueResponse, error)
	GetAll(ctx context.Context, filter query.InventoryIssueFilter) ([]dtodomain.InventoryIssueResponse, int64, error)
	Update(ctx context.Context, req dtodomain.InventoryIssueUpdateRequest, id string) (dtodomain.InventoryIssueResponse, error)
	Delete(ctx context.Context, id string) error
	GetLinesByIssueId(ctx context.Context, issueId string) ([]dtodomain.InventoryIssueLineResponse, error)
	CreateLine(ctx context.Context, issueId string, req dtodomain.InventoryIssueLineCreateRequest) (dtodomain.InventoryIssueLineResponse, error)
	UpdateLine(ctx context.Context, lineId string, req dtodomain.InventoryIssueLineUpdateRequest) (dtodomain.InventoryIssueLineResponse, error)
	DeleteLine(ctx context.Context, lineId string) error
}

type inventoryIssueService struct {
	db              *gorm.DB
	issueRepo       repository.InventoryIssueRepository
	issueLineRepo   repository.InventoryIssueLineRepository
	sequenceService sequenceservice.SequenceService
}

// GetLinesByIssueId implements InventoryIssueService.
func (s *inventoryIssueService) GetLinesByIssueId(ctx context.Context, issueId string) ([]dtodomain.InventoryIssueLineResponse, error) {
	lines, err := s.issueLineRepo.GetAllByIssueId(ctx, issueId)
	if err != nil {
		return nil, err
	}
	return dtodomain.ToInventoryIssueLineResponses(lines), nil
}

func NewInventoryIssueService(db *gorm.DB, issueRepo repository.InventoryIssueRepository, issueLineRepo repository.InventoryIssueLineRepository, sequenceService sequenceservice.SequenceService) InventoryIssueService {
	return &inventoryIssueService{db: db, issueRepo: issueRepo, issueLineRepo: issueLineRepo, sequenceService: sequenceService}
}

func (s *inventoryIssueService) Create(ctx context.Context, req dtodomain.InventoryIssueCreateRequest) (dtodomain.InventoryIssueResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	clientUUID, err := uuid.Parse(req.ClientID)
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	issuerUUID, err := uuid.Parse(req.IssuerBy)
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	invRequestUUID, err := uuid.Parse(req.InvRequestID)
	if err != nil && req.InvRequestID != "" {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	docNum, err := s.sequenceService.GenerateDocumentNumber(ctx, req.ClientID, "ISSUE", pkgdto.SequenceConfig{
		Prefix:     "ISSUE",
		EntityType: "INV_ISSUE",
		Period:     "",
	})
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	issue := entities.TInventoryIssueEntity{
		DocumentNumber: docNum,
		DocumentDate:   utils.StringToDateTime(req.DocumentDate),
		DueDate:        utils.StringToDateTime(req.DueDate),
		IssuerBy:       issuerUUID,
		InvRequestID:   invRequestUUID,
		ClientID:       clientUUID,
		Status:         req.Status,
	}
	created, err := s.issueRepo.Create(ctx, tx, issue)
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	// Bulk create lines
	var lines []entities.TInventoryIssueLineEntity
	for _, lineReq := range req.IssueLines {
		productUUID, err := uuid.Parse(lineReq.ProductID)
		if err != nil && lineReq.ProductID != "" {
			tx.Rollback()
			return dtodomain.InventoryIssueResponse{}, err
		}
		warehouseUUID, err := uuid.Parse(lineReq.WarehouseID)
		if err != nil && lineReq.WarehouseID != "" {
			tx.Rollback()
			return dtodomain.InventoryIssueResponse{}, err
		}
		clientLineUUID, err := uuid.Parse(lineReq.ClientID)
		if err != nil {
			tx.Rollback()
			return dtodomain.InventoryIssueResponse{}, err
		}
		lines = append(lines, entities.TInventoryIssueLineEntity{
			CurrentStock:    lineReq.CurrentStock,
			MinStock:        lineReq.MinStock,
			RequestQuantity: lineReq.RequestQuantity,
			IssuedQuantity:  lineReq.IssuedQuantity,
			Remarks:         lineReq.Remarks,
			InvIssueID:      created.ID,
			ProductID:       productUUID,
			WarehouseID:     warehouseUUID,
			ClientID:        clientLineUUID,
		})
	}
	if len(lines) > 0 {
		err = s.issueLineRepo.BulkCreate(ctx, tx, lines)
		if err != nil {
			tx.Rollback()
			return dtodomain.InventoryIssueResponse{}, err
		}
	}
	tx.Commit()
	result, err := s.issueRepo.GetById(ctx, nil, created.ID.String())
	if err != nil {
		return dtodomain.InventoryIssueResponse{}, err
	}
	return dtodomain.ToInventoryIssueResponse(result), nil
}

func (s *inventoryIssueService) GetById(ctx context.Context, id string) (dtodomain.InventoryIssueResponse, error) {
	issue, err := s.issueRepo.GetById(ctx, nil, id)
	if err != nil {
		return dtodomain.InventoryIssueResponse{}, err
	}
	return dtodomain.ToInventoryIssueResponse(issue), nil
}

func (s *inventoryIssueService) GetAll(ctx context.Context, filter query.InventoryIssueFilter) ([]dtodomain.InventoryIssueResponse, int64, error) {
	issues, total, err := s.issueRepo.GetAll(ctx, filter)
	if err != nil {
		return nil, 0, err
	}
	var responses []dtodomain.InventoryIssueResponse
	for _, e := range issues {
		responses = append(responses, dtodomain.ToInventoryIssueResponse(e))
	}
	if responses == nil {
		responses = make([]dtodomain.InventoryIssueResponse, 0)
	}
	return responses, total, nil
}

func (s *inventoryIssueService) Update(ctx context.Context, req dtodomain.InventoryIssueUpdateRequest, id string) (dtodomain.InventoryIssueResponse, error) {
	tx := s.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	issue, err := s.issueRepo.GetById(ctx, tx, id)
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	issue.DocumentDate = utils.StringToDateTime(req.DocumentDate)
	issue.DueDate = utils.StringToDateTime(req.DueDate)
	issue.Status = req.Status
	updated, err := s.issueRepo.Update(ctx, tx, issue)
	if err != nil {
		tx.Rollback()
		return dtodomain.InventoryIssueResponse{}, err
	}
	tx.Commit()
	result, err := s.issueRepo.GetById(ctx, nil, updated.ID.String())
	if err != nil {
		return dtodomain.InventoryIssueResponse{}, err
	}
	return dtodomain.ToInventoryIssueResponse(result), nil
}

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

func (s *inventoryIssueService) CreateLine(ctx context.Context, issueId string, req dtodomain.InventoryIssueLineCreateRequest) (dtodomain.InventoryIssueLineResponse, error) {
	issueUUID, err := uuid.Parse(issueId)
	if err != nil {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	productUUID, err := uuid.Parse(req.ProductID)
	if err != nil && req.ProductID != "" {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	warehouseUUID, err := uuid.Parse(req.WarehouseID)
	if err != nil && req.WarehouseID != "" {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	clientLineUUID, err := uuid.Parse(req.ClientID)
	if err != nil {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	line := entities.TInventoryIssueLineEntity{
		CurrentStock:    req.CurrentStock,
		MinStock:        req.MinStock,
		RequestQuantity: req.RequestQuantity,
		IssuedQuantity:  req.IssuedQuantity,
		Remarks:         req.Remarks,
		InvIssueID:      issueUUID,
		ProductID:       productUUID,
		WarehouseID:     warehouseUUID,
		ClientID:        clientLineUUID,
	}
	created, err := s.issueLineRepo.Create(ctx, nil, line)
	if err != nil {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	product := dtodomain.InventoryIssueProductResponse{}
	if created.Product.ID != uuid.Nil {
		product = dtodomain.InventoryIssueProductResponse{
			ID:        created.Product.ID.String(),
			RefNumber: created.Product.RefNumber,
			Name:      created.Product.Name,
		}
	}
	warehouse := pkgdto.IdNameResponse{}
	if created.Warehouse.ID != uuid.Nil {
		warehouse = pkgdto.IdNameResponse{
			ID:   created.Warehouse.ID.String(),
			Name: created.Warehouse.Name,
		}
	}
	clientLine := pkgdto.IdNameResponse{}
	if created.Client.ID != uuid.Nil {
		clientLine = pkgdto.IdNameResponse{
			ID:   created.Client.ID.String(),
			Name: created.Client.Name,
		}
	}
	return dtodomain.InventoryIssueLineResponse{
		ID:              created.ID.String(),
		CurrentStock:    created.CurrentStock,
		MinStock:        created.MinStock,
		RequestQuantity: created.RequestQuantity,
		IssuedQuantity:  created.IssuedQuantity,
		Remarks:         created.Remarks,
		Product:         product,
		Warehouse:       warehouse,
		Client:          clientLine,
	}, nil
}

func (s *inventoryIssueService) UpdateLine(ctx context.Context, lineId string, req dtodomain.InventoryIssueLineUpdateRequest) (dtodomain.InventoryIssueLineResponse, error) {
	line, err := s.issueLineRepo.GetById(ctx, nil, lineId)
	if err != nil {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	if req.CurrentStock != nil {
		line.CurrentStock = *req.CurrentStock
	}
	if req.MinStock != nil {
		line.MinStock = *req.MinStock
	}
	if req.RequestQuantity != nil {
		line.RequestQuantity = *req.RequestQuantity
	}
	if req.IssuedQuantity != nil {
		line.IssuedQuantity = *req.IssuedQuantity
	}
	if req.Remarks != nil {
		line.Remarks = *req.Remarks
	}
	if req.ProductID != nil {
		if *req.ProductID != "" {
			tmp, err := uuid.Parse(*req.ProductID)
			if err != nil {
				return dtodomain.InventoryIssueLineResponse{}, err
			}
			line.ProductID = tmp
		} else {
			line.ProductID = uuid.Nil
		}
	}
	if req.WarehouseID != nil {
		if *req.WarehouseID != "" {
			tmp, err := uuid.Parse(*req.WarehouseID)
			if err != nil {
				return dtodomain.InventoryIssueLineResponse{}, err
			}
			line.WarehouseID = tmp
		} else {
			line.WarehouseID = uuid.Nil
		}
	}
	if req.ClientID != nil {
		if *req.ClientID != "" {
			tmp, err := uuid.Parse(*req.ClientID)
			if err != nil {
				return dtodomain.InventoryIssueLineResponse{}, err
			}
			line.ClientID = tmp
		} else {
			line.ClientID = uuid.Nil
		}
	}
	updated, err := s.issueLineRepo.Update(ctx, nil, line)
	if err != nil {
		return dtodomain.InventoryIssueLineResponse{}, err
	}
	product := dtodomain.InventoryIssueProductResponse{}
	if updated.Product.ID != uuid.Nil {
		product = dtodomain.InventoryIssueProductResponse{
			ID:        updated.Product.ID.String(),
			RefNumber: updated.Product.RefNumber,
			Name:      updated.Product.Name,
		}
	}
	warehouse := pkgdto.IdNameResponse{}
	if updated.Warehouse.ID != uuid.Nil {
		warehouse = pkgdto.IdNameResponse{
			ID:   updated.Warehouse.ID.String(),
			Name: updated.Warehouse.Name,
		}
	}
	clientLine := pkgdto.IdNameResponse{}
	if updated.Client.ID != uuid.Nil {
		clientLine = pkgdto.IdNameResponse{
			ID:   updated.Client.ID.String(),
			Name: updated.Client.Name,
		}
	}
	return dtodomain.InventoryIssueLineResponse{
		ID:              updated.ID.String(),
		CurrentStock:    updated.CurrentStock,
		MinStock:        updated.MinStock,
		RequestQuantity: updated.RequestQuantity,
		IssuedQuantity:  updated.IssuedQuantity,
		Remarks:         updated.Remarks,
		Product:         product,
		Warehouse:       warehouse,
		Client:          clientLine,
	}, nil
}

func (s *inventoryIssueService) DeleteLine(ctx context.Context, lineId string) error {
	return s.issueLineRepo.Delete(ctx, nil, lineId)
}