package handler

import (
	"strconv"

	"apskel-pos-be/internal/appcontext"
	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/logger"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"
	"apskel-pos-be/internal/validator"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type PurchaseCategoryHandler struct {
	purchaseCategoryService   service.PurchaseCategoryService
	purchaseCategoryValidator validator.PurchaseCategoryValidator
}

func NewPurchaseCategoryHandler(purchaseCategoryService service.PurchaseCategoryService, purchaseCategoryValidator validator.PurchaseCategoryValidator) *PurchaseCategoryHandler {
	return &PurchaseCategoryHandler{
		purchaseCategoryService:   purchaseCategoryService,
		purchaseCategoryValidator: purchaseCategoryValidator,
	}
}

func (h *PurchaseCategoryHandler) CreatePurchaseCategory(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	var req contract.CreatePurchaseCategoryRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(ctx).WithError(err).Error("PurchaseCategoryHandler::CreatePurchaseCategory -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, err.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::CreatePurchaseCategory")
		return
	}

	if validationError, validationErrorCode := h.purchaseCategoryValidator.ValidateCreatePurchaseCategoryRequest(&req); validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::CreatePurchaseCategory")
		return
	}

	response := h.purchaseCategoryService.CreatePurchaseCategory(ctx, contextInfo, &req)
	util.HandleResponse(c.Writer, c.Request, response, "PurchaseCategoryHandler::CreatePurchaseCategory")
}

func (h *PurchaseCategoryHandler) UpdatePurchaseCategory(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	categoryID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid purchase category ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::UpdatePurchaseCategory")
		return
	}

	var req contract.UpdatePurchaseCategoryRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(ctx).WithError(err).Error("PurchaseCategoryHandler::UpdatePurchaseCategory -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, err.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::UpdatePurchaseCategory")
		return
	}

	if validationError, validationErrorCode := h.purchaseCategoryValidator.ValidateUpdatePurchaseCategoryRequest(&req); validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::UpdatePurchaseCategory")
		return
	}

	response := h.purchaseCategoryService.UpdatePurchaseCategory(ctx, contextInfo, categoryID, &req)
	util.HandleResponse(c.Writer, c.Request, response, "PurchaseCategoryHandler::UpdatePurchaseCategory")
}

func (h *PurchaseCategoryHandler) DeletePurchaseCategory(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	categoryID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid purchase category ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::DeletePurchaseCategory")
		return
	}

	response := h.purchaseCategoryService.DeletePurchaseCategory(ctx, contextInfo, categoryID)
	util.HandleResponse(c.Writer, c.Request, response, "PurchaseCategoryHandler::DeletePurchaseCategory")
}

func (h *PurchaseCategoryHandler) GetPurchaseCategory(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	categoryID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid purchase category ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::GetPurchaseCategory")
		return
	}

	response := h.purchaseCategoryService.GetPurchaseCategoryByID(ctx, contextInfo, categoryID)
	util.HandleResponse(c.Writer, c.Request, response, "PurchaseCategoryHandler::GetPurchaseCategory")
}

func (h *PurchaseCategoryHandler) ListPurchaseCategories(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	req := &contract.ListPurchaseCategoriesRequest{
		Page:  1,
		Limit: 100,
	}

	if pageStr := c.Query("page"); pageStr != "" {
		if page, err := strconv.Atoi(pageStr); err == nil {
			req.Page = page
		}
	}

	if limitStr := c.Query("limit"); limitStr != "" {
		if limit, err := strconv.Atoi(limitStr); err == nil {
			req.Limit = limit
		}
	}

	if parentIDStr := c.Query("parent_id"); parentIDStr != "" {
		if parentID, err := uuid.Parse(parentIDStr); err == nil {
			req.ParentID = &parentID
		}
	}

	if categoryType := c.Query("type"); categoryType != "" {
		req.Type = categoryType
	}

	if search := c.Query("search"); search != "" {
		req.Search = search
	}

	if isActiveStr := c.Query("is_active"); isActiveStr != "" {
		if isActive, err := strconv.ParseBool(isActiveStr); err == nil {
			req.IsActive = &isActive
		}
	}

	if validationError, validationErrorCode := h.purchaseCategoryValidator.ValidateListPurchaseCategoriesRequest(req); validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "PurchaseCategoryHandler::ListPurchaseCategories")
		return
	}

	response := h.purchaseCategoryService.ListPurchaseCategories(ctx, contextInfo, req)
	util.HandleResponse(c.Writer, c.Request, response, "PurchaseCategoryHandler::ListPurchaseCategories")
}