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 UserDeviceHandler struct {
	userDeviceService   service.UserDeviceService
	userDeviceValidator validator.UserDeviceValidator
}

func NewUserDeviceHandler(
	userDeviceService service.UserDeviceService,
	userDeviceValidator validator.UserDeviceValidator,
) *UserDeviceHandler {
	return &UserDeviceHandler{
		userDeviceService:   userDeviceService,
		userDeviceValidator: userDeviceValidator,
	}
}

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

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

	validationError, validationErrorCode := h.userDeviceValidator.ValidateRegisterDeviceRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::RegisterDevice")
		return
	}

	deviceResponse := h.userDeviceService.RegisterDevice(ctx, contextInfo.UserID, &req)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::RegisterDevice -> Failed to register device from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::RegisterDevice")
}

func (h *UserDeviceHandler) UpdateDevice(c *gin.Context) {
	ctx := c.Request.Context()

	deviceIDStr := c.Param("id")
	deviceID, err := uuid.Parse(deviceIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("UserDeviceHandler::UpdateDevice -> Invalid device ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid device ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::UpdateDevice")
		return
	}

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

	validationError, validationErrorCode := h.userDeviceValidator.ValidateUpdateDeviceRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::UpdateDevice")
		return
	}

	deviceResponse := h.userDeviceService.UpdateDevice(ctx, deviceID, &req)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::UpdateDevice -> Failed to update device from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::UpdateDevice")
}

func (h *UserDeviceHandler) DeleteDevice(c *gin.Context) {
	ctx := c.Request.Context()

	deviceIDStr := c.Param("id")
	deviceID, err := uuid.Parse(deviceIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("UserDeviceHandler::DeleteDevice -> Invalid device ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid device ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::DeleteDevice")
		return
	}

	deviceResponse := h.userDeviceService.DeleteDevice(ctx, deviceID)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::DeleteDevice -> Failed to delete device from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::DeleteDevice")
}

func (h *UserDeviceHandler) GetDevice(c *gin.Context) {
	ctx := c.Request.Context()

	deviceIDStr := c.Param("id")
	deviceID, err := uuid.Parse(deviceIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("UserDeviceHandler::GetDevice -> Invalid device ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid device ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::GetDevice")
		return
	}

	deviceResponse := h.userDeviceService.GetDeviceByID(ctx, deviceID)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::GetDevice -> Failed to get device from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::GetDevice")
}

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

	deviceResponse := h.userDeviceService.GetDevicesByUserID(ctx, contextInfo.UserID)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::GetMyDevices -> Failed to get devices from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::GetMyDevices")
}

func (h *UserDeviceHandler) GetDevicesByUser(c *gin.Context) {
	ctx := c.Request.Context()

	userIDStr := c.Param("user_id")
	userID, err := uuid.Parse(userIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("UserDeviceHandler::GetDevicesByUser -> Invalid user ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid user ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::GetDevicesByUser")
		return
	}

	deviceResponse := h.userDeviceService.GetDevicesByUserID(ctx, userID)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::GetDevicesByUser -> Failed to get devices from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::GetDevicesByUser")
}

func (h *UserDeviceHandler) ListDevices(c *gin.Context) {
	ctx := c.Request.Context()

	req := &contract.ListUserDevicesRequest{
		Page:  1,
		Limit: 10,
	}

	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 userID := c.Query("user_id"); userID != "" {
		req.UserID = userID
	}

	if platform := c.Query("platform"); platform != "" {
		req.Platform = platform
	}

	validationError, validationErrorCode := h.userDeviceValidator.ValidateListDevicesRequest(req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "UserDeviceHandler::ListDevices")
		return
	}

	deviceResponse := h.userDeviceService.ListDevices(ctx, req)
	if deviceResponse.HasErrors() {
		errorResp := deviceResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("UserDeviceHandler::ListDevices -> Failed to list devices from service")
	}

	util.HandleResponse(c.Writer, c.Request, deviceResponse, "UserDeviceHandler::ListDevices")
}