package service

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	dtodomain "github.com/Caknoooo/go-gin-clean-starter/modules/warehouse/dto"
	"github.com/Caknoooo/go-gin-clean-starter/modules/warehouse/query"
	"github.com/Caknoooo/go-gin-clean-starter/modules/warehouse/repository"
	"github.com/Caknoooo/go-gin-clean-starter/pkg/constants"
	"github.com/Caknoooo/go-gin-clean-starter/pkg/utils"
	"github.com/google/uuid"
	"github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

type WarehouseService interface {
	Create(ctx context.Context, req dtodomain.WarehouseCreateRequest) (dtodomain.WarehouseResponse, error)
	GetById(ctx context.Context, warehouseId string) (dtodomain.WarehouseResponse, error)
	GetAll(ctx context.Context, filter query.WarehouseFilter) ([]dtodomain.WarehouseResponse, int64, error)
	Update(ctx context.Context, req dtodomain.WarehouseUpdateRequest, warehouseId string) (dtodomain.WarehouseResponse, error)
	Delete(ctx context.Context, warehouseId string) error
}

type warehouseService struct {
	db            *gorm.DB
	warehouseRepo repository.WarehouseRepository
	log           *logrus.Logger
}

func (w *warehouseService) Create(ctx context.Context, req dtodomain.WarehouseCreateRequest) (dtodomain.WarehouseResponse, error) {
	tx := w.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	clientUUID, err := uuid.Parse(req.ClientID)
	if err != nil {
		tx.Rollback()
		return dtodomain.WarehouseResponse{}, err
	}
	warehouse := entities.MWarehouseEntity{
		Code:                       req.Code,
		Name:                       req.Name,
		Description:                req.Description,
		Status:                     req.Status,
		DissallowNegativeInventory: req.DissallowNegativeInventory,
		PICID:                      utils.ParseNullableUUID(req.PICID),
		ClientID:                   clientUUID,
		FullAuditTrail:             utils.FillAuditTrail(ctx, constants.CREATE),
	}

	created, err := w.warehouseRepo.Create(ctx, tx, warehouse)
	if err != nil {
		tx.Rollback()
		return dtodomain.WarehouseResponse{}, err
	}
	tx.Commit()
	result, err := w.warehouseRepo.GetById(ctx, nil, created.ID.String())
	if err != nil {
		return dtodomain.WarehouseResponse{}, err
	}
	w.log.WithFields(logrus.Fields{
		"user_id":   utils.GetUserID(ctx),
		"action":    "create",
		"entity":    "warehouse",
		"entity_id": created.ID.String(),
	}).Info("Warehouse created")
	return dtodomain.ToWarehouseResponse(result), nil
}

func (w *warehouseService) GetById(ctx context.Context, warehouseId string) (dtodomain.WarehouseResponse, error) {
	warehouse, err := w.warehouseRepo.GetById(ctx, nil, warehouseId)
	if err != nil {
		return dtodomain.WarehouseResponse{}, err
	}
	return dtodomain.ToWarehouseResponse(warehouse), nil
}

func (w *warehouseService) GetAll(ctx context.Context, filter query.WarehouseFilter) ([]dtodomain.WarehouseResponse, int64, error) {
	warehouses, total, err := w.warehouseRepo.GetAll(ctx, filter)
	if err != nil {
		return nil, 0, err
	}
	var responses []dtodomain.WarehouseResponse
	for _, e := range warehouses {
		responses = append(responses, dtodomain.ToWarehouseResponse(e))
	}
	if responses == nil {
		responses = make([]dtodomain.WarehouseResponse, 0)
	}
	return responses, total, nil
}

func (w *warehouseService) Update(ctx context.Context, req dtodomain.WarehouseUpdateRequest, warehouseId string) (dtodomain.WarehouseResponse, error) {
	tx := w.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	warehouse, err := w.warehouseRepo.GetById(ctx, tx, warehouseId)
	if err != nil {
		tx.Rollback()
		return dtodomain.WarehouseResponse{}, err
	}
	before := warehouse
	if req.Code != "" {
		warehouse.Code = req.Code
	}
	if req.Name != "" {
		warehouse.Name = req.Name
	}
	warehouse.Description = req.Description
	warehouse.Status = req.Status
	warehouse.DissallowNegativeInventory = req.DissallowNegativeInventory
	if req.ClientID != "" {
		clientUUID, err := uuid.Parse(req.ClientID)
		if err == nil {
			warehouse.ClientID = clientUUID
		}
	}
	warehouse.PICID = utils.ParseNullableUUID(req.PICID)
	warehouse.FullAuditTrail = utils.FillAuditTrail(ctx, constants.UPDATE)
	updated, err := w.warehouseRepo.Update(ctx, tx, warehouse)
	if err != nil {
		tx.Rollback()
		return dtodomain.WarehouseResponse{}, err
	}
	tx.Commit()
	result, err := w.warehouseRepo.GetById(ctx, nil, updated.ID.String())
	if err != nil {
		return dtodomain.WarehouseResponse{}, err
	}
	changes := utils.GetChangedFields(before, result)
	w.log.WithFields(logrus.Fields{
		"user_id":   utils.GetUserID(ctx),
		"action":    "update",
		"entity":    "warehouse",
		"entity_id": warehouseId,
		"changes":   changes,
	}).Info("Warehouse updated")
	return dtodomain.ToWarehouseResponse(result), nil
}

func (w *warehouseService) Delete(ctx context.Context, warehouseId string) error {
	tx := w.db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	warehouse, err := w.warehouseRepo.GetById(ctx, tx, warehouseId)
	if err != nil {
		tx.Rollback()
		return err
	}
	warehouse.FullAuditTrail = utils.FillAuditTrail(ctx, constants.DELETE)
	if _, err := w.warehouseRepo.Update(ctx, tx, warehouse); err != nil {
		tx.Rollback()
		return err
	}
	if err := w.warehouseRepo.Delete(ctx, tx, warehouseId); err != nil {
		tx.Rollback()
		return err
	}
	tx.Commit()
	w.log.WithFields(logrus.Fields{
		"user_id":   utils.GetUserID(ctx),
		"action":    "delete",
		"entity":    "warehouse",
		"entity_id": warehouseId,
	}).Info("Warehouse deleted")
	return nil
}

func NewWarehouseService(warehouseRepo repository.WarehouseRepository, db *gorm.DB, log *logrus.Logger) WarehouseService {
	return &warehouseService{
		warehouseRepo: warehouseRepo,
		db:            db,
		log:           log,
	}
}