package service

import (
	"errors"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	rProductWarehouse "gitlab.com/mbugroup/lti-api.git/internal/modules/inventory/product-warehouses/repositories"
	KandangRepo "gitlab.com/mbugroup/lti-api.git/internal/modules/master/kandangs/repositories"
	rWarehouse "gitlab.com/mbugroup/lti-api.git/internal/modules/master/warehouses/repositories"
	repository "gitlab.com/mbugroup/lti-api.git/internal/modules/production/chickins/repositories"
	rProjectFlockKandang "gitlab.com/mbugroup/lti-api.git/internal/modules/production/project_flocks/repositories"

	validation "gitlab.com/mbugroup/lti-api.git/internal/modules/production/chickins/validations"
	rProjectFlock "gitlab.com/mbugroup/lti-api.git/internal/modules/production/project_flocks/repositories"
	AuditLogRepo "gitlab.com/mbugroup/lti-api.git/internal/modules/shared/repositories"
	"gitlab.com/mbugroup/lti-api.git/internal/utils"

	"github.com/go-playground/validator/v10"
	"github.com/gofiber/fiber/v2"
	"github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

type ChickinService interface {
	GetAll(ctx *fiber.Ctx, params *validation.Query) ([]entity.ProjectChickin, int64, error)
	GetOne(ctx *fiber.Ctx, id uint) (*entity.ProjectChickin, error)
	CreateOne(ctx *fiber.Ctx, req *validation.Create) (*entity.ProjectChickin, error)
	UpdateOne(ctx *fiber.Ctx, req *validation.Update, id uint) (*entity.ProjectChickin, error)
	DeleteOne(ctx *fiber.Ctx, id uint) error
	Approve(ctx *fiber.Ctx, id uint) error
}

type chickinService struct {
	Log                     *logrus.Logger
	Validate                *validator.Validate
	Repository              repository.ProjectChickinRepository
	KandangRepo             KandangRepo.KandangRepository
	WarehouseRepo           rWarehouse.WarehouseRepository
	ProductWarehouseRepo    rProductWarehouse.ProductWarehouseRepository
	ProjectFlockRepo        rProjectFlock.ProjectflockRepository
	AuditLogRepo            AuditLogRepo.AuditLogRepository
	ProjectflockKandangRepo rProjectFlockKandang.ProjectFlockKandangRepository
}

func NewChickinService(repo repository.ProjectChickinRepository, kandangRepo KandangRepo.KandangRepository, warehouseRepo rWarehouse.WarehouseRepository, productWarehouseRepo rProductWarehouse.ProductWarehouseRepository, projectFlockRepo rProjectFlock.ProjectflockRepository, auditLogRepo AuditLogRepo.AuditLogRepository, projectflockkandangRepo rProjectFlockKandang.ProjectFlockKandangRepository, validate *validator.Validate) ChickinService {
	return &chickinService{
		Log:                     utils.Log,
		Validate:                validate,
		Repository:              repo,
		KandangRepo:             kandangRepo,
		WarehouseRepo:           warehouseRepo,
		ProductWarehouseRepo:    productWarehouseRepo,
		ProjectFlockRepo:        projectFlockRepo,
		AuditLogRepo:            auditLogRepo,
		ProjectflockKandangRepo: projectflockkandangRepo,
	}
}

func (s chickinService) withRelations(db *gorm.DB) *gorm.DB {
	return db.
		Preload("CreatedUser").
		Preload("ProjectFlockKandang.Kandang").
		Preload("ProjectFlockKandang.ProjectFlock").
		Preload("ProjectFlockKandang.ProjectFlock.Flock").
		Preload("ProjectFlockKandang.ProjectFlock.ProductCategory").
		Preload("ProjectFlockKandang.ProjectFlock.Area").
		Preload("ProjectFlockKandang.ProjectFlock.Fcr").
		Preload("ProjectFlockKandang.ProjectFlock.Location")

}

func (s chickinService) GetAll(c *fiber.Ctx, params *validation.Query) ([]entity.ProjectChickin, int64, error) {
	if err := s.Validate.Struct(params); err != nil {
		return nil, 0, err
	}

	offset := (params.Page - 1) * params.Limit

	chickins, total, err := s.Repository.GetAll(c.Context(), offset, params.Limit, func(db *gorm.DB) *gorm.DB {
		db = s.withRelations(db)
		if params.Search != "" {
			return db.Where("name LIKE ?", "%"+params.Search+"%")
		}
		return db.Order("created_at DESC").Order("updated_at DESC")
	})

	if err != nil {
		s.Log.Errorf("Failed to get chickins: %+v", err)
		return nil, 0, err
	}
	return chickins, total, nil
}

func (s chickinService) GetOne(c *fiber.Ctx, id uint) (*entity.ProjectChickin, error) {
	chickin, err := s.Repository.GetByID(c.Context(), id, s.withRelations)
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, fiber.NewError(fiber.StatusNotFound, "Chickin not found")
	}
	if err != nil {
		s.Log.Errorf("Failed get chickin by id: %+v", err)
		return nil, err
	}
	return chickin, nil
}

func (s *chickinService) CreateOne(c *fiber.Ctx, req *validation.Create) (*entity.ProjectChickin, error) {
	if err := s.Validate.Struct(req); err != nil {
		return nil, err
	}

	// ambil salah satu kandang dari project_floc_id dari kandang repository
	projectflockkandang, err := s.ProjectflockKandangRepo.GetByID(c.Context(), 1)
	if err != nil {
		s.Log.Errorf("Failed to get projectflock kandang: %+v", err)
		return nil, err
	}
	// ambil warehouse dari kandangid
	warehouse, err := s.WarehouseRepo.GetByKandangID(c.Context(), projectflockkandang.KandangId)
	if err != nil {
		s.Log.Errorf("Failed to get warehouse: %+v", err)
		return nil, err
	}

	// getprojectflock id with  relation
	projectFlock, err := s.ProjectFlockRepo.GetByID(
		c.Context(),
		projectflockkandang.ProjectFlockId,
		func(db *gorm.DB) *gorm.DB {
			return db.Preload("ProductCategory")
		},
	)

	if err != nil {
		s.Log.Errorf("Failed to get project flock: %+v", err)
		return nil, fiber.NewError(fiber.StatusNotFound, "Project Flock not found")
	}
	// ambil quantity
	var productWarehouse entity.ProductWarehouse
	err = s.ProductWarehouseRepo.DB().WithContext(c.Context()).
		Joins("JOIN products ON products.id = product_warehouses.product_id").
		Joins("JOIN product_categories ON product_categories.id = products.product_category_id").
		Where("product_categories.code = ? AND product_warehouses.warehouse_id = ?", projectFlock.ProductCategory.Code, warehouse.Id).
		Order("created_at DESC").
		First(&productWarehouse).Error

	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, fiber.NewError(fiber.StatusNotFound, "Product Warehouse not found for the given Project Flock and Warehouse")
		}
		s.Log.Errorf("Failed to get product warehouse: %+v", err)
		return nil, err
	}

	if productWarehouse.Quantity < 1 {
		return nil, fiber.NewError(fiber.StatusBadRequest, "Insufficient product quantity in warehouse")
	}

	// masukan ke chic in
	chickinDate, err := utils.ParseDateString(req.ChickInDate)
	if err != nil {
		s.Log.Errorf("Failed to parse chickin date: %+v", err)
		return nil, fiber.NewError(fiber.StatusBadRequest, "Invalid ChickInDate format")
	}

	newChickin := &entity.ProjectChickin{
		ProjectFlocKandangId: projectflockkandang.ProjectFlockId,
		ChickInDate:          chickinDate,
		Quantity:             productWarehouse.Quantity,
		Note:                 "",
		CreatedBy:            1, //todo: ganti dengan
	}

	err = s.Repository.CreateOne(c.Context(), newChickin, nil)
	if err != nil {
		s.Log.Errorf("Failed to create chickin: %+v", err)
		return nil, err
	}

	// Kurangi quantity di product warehouse
	updatedQuantity := productWarehouse.Quantity - newChickin.Quantity
	if updatedQuantity < 0 {
		updatedQuantity = 0
	}
	err = s.ProductWarehouseRepo.PatchOne(c.Context(), productWarehouse.Id, map[string]any{
		"quantity": updatedQuantity,
	}, nil)
	if err != nil {
		s.Log.Errorf("Failed to update product warehouse quantity: %+v", err)
		return nil, err
	}

	// masukan check apakah stock availability ada, jika ada update, jika tidak buat baru
	stockAvailability := &entity.StockAvailability{
		EntityType:       entity.EntityTypeProjectFlockKandang,
		ReservedQuantity: productWarehouse.Quantity,
		EntityId:         projectflockkandang.Id,
		ProductId:        productWarehouse.ProductId,
	}

	var existingStockAvailability entity.StockAvailability
	err = s.ProductWarehouseRepo.DB().WithContext(c.Context()).
		Where("entity_type = ? AND entity_id = ? AND product_id = ?", stockAvailability.EntityType, stockAvailability.EntityId, stockAvailability.ProductId).
		First(&existingStockAvailability).Error

	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			// buat baru
			stockAvailability.ReservedQuantity = newChickin.Quantity
			stockAvailability.Quantity = 0
			err = s.ProductWarehouseRepo.DB().WithContext(c.Context()).Create(stockAvailability).Error
			if err != nil {
				s.Log.Errorf("Failed to create stock availability: %+v", err)
				return nil, err
			}
		} else {
			s.Log.Errorf("Failed to get stock availability: %+v", err)
			return nil, err
		}
	} else {
		// update existing
		newQuantity := existingStockAvailability.ReservedQuantity + newChickin.Quantity
		err = s.ProductWarehouseRepo.DB().WithContext(c.Context()).
			Model(&existingStockAvailability).
			Update("reserved_quantity", newQuantity).Error
		if err != nil {
			s.Log.Errorf("Failed to update stock availability: %+v", err)
			return nil, err
		}

	}

	return s.GetOne(c, newChickin.Id)
}

func (s chickinService) UpdateOne(c *fiber.Ctx, req *validation.Update, id uint) (*entity.ProjectChickin, error) {
	if err := s.Validate.Struct(req); err != nil {
		return nil, err
	}

	updateBody := make(map[string]any)

	if req.ChickInDate != "" {
		updateBody["chick_in_date"] = req.ChickInDate
	}
	if len(updateBody) == 0 {
		return s.GetOne(c, id)
	}

	if err := s.Repository.PatchOne(c.Context(), id, updateBody, nil); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, fiber.NewError(fiber.StatusNotFound, "Chickin not found")
		}
		s.Log.Errorf("Failed to update chickin: %+v", err)
		return nil, err
	}

	return s.GetOne(c, id)
}

func (s chickinService) DeleteOne(c *fiber.Ctx, id uint) error {
	if err := s.Repository.DeleteOne(c.Context(), id); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return fiber.NewError(fiber.StatusNotFound, "Chickin not found")
		}
		s.Log.Errorf("Failed to delete chickin: %+v", err)
		return err
	}
	return nil
}

func (s *chickinService) Approve(c *fiber.Ctx, id uint) error {

	chickin, err := s.Repository.GetByID(
		c.Context(),
		id,
		nil,
	)
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return fiber.NewError(fiber.StatusNotFound, "Chickin not found")
	}
	if err != nil {
		s.Log.Errorf("Failed get chickin by id: %+v", err)
		return err
	}

	//pindahkan stock dari reserved ke actual stock
	// get stock avaibility untuk di update
	var stockAvailability entity.StockAvailability
	err = s.ProductWarehouseRepo.DB().WithContext(c.Context()).
		Where("entity_type = ? AND entity_id = ? ", entity.EntityTypeProjectFlockKandang, chickin.ProjectFlocKandangId).
		First(&stockAvailability).Error
	if err != nil {
		s.Log.Errorf("Failed to get stock availability: %+v", err)
		return err
	}

	newReservedQuantity := stockAvailability.ReservedQuantity - chickin.Quantity
	if newReservedQuantity < 0 {
		newReservedQuantity = 0
	}

	return nil
}