package handler

import (
	"errors"

	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/logger"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/processor"
	"apskel-pos-be/internal/repository"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"

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

type CustomerPointsHandler struct {
	customerPointsService service.CustomerPointsService
}

func NewCustomerPointsHandler(customerPointsService service.CustomerPointsService) *CustomerPointsHandler {
	return &CustomerPointsHandler{
		customerPointsService: customerPointsService,
	}
}

func (h *CustomerPointsHandler) GetCustomerPoints(c *gin.Context) {
	ctx := c.Request.Context()

	// Get customer ID from context (set by middleware)
	customerID, exists := c.Get("customer_id")
	if !exists {
		logger.FromContext(ctx).Error("Customer ID not found in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), "CustomerPointsHandler::GetCustomerPoints")
		return
	}

	customerIDStr, ok := customerID.(string)
	if !ok {
		logger.FromContext(ctx).Error("Invalid customer ID type in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Invalid customer ID"),
		}), "CustomerPointsHandler::GetCustomerPoints")
		return
	}

	response, err := h.customerPointsService.GetCustomerPoints(ctx, customerIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerPoints -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(walletErrorCode(err), constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerPoints")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerPoints")
}

func (h *CustomerPointsHandler) GetCustomerTokens(c *gin.Context) {
	ctx := c.Request.Context()

	// Get customer ID from context (set by middleware)
	customerID, exists := c.Get("customer_id")
	if !exists {
		logger.FromContext(ctx).Error("Customer ID not found in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), "CustomerPointsHandler::GetCustomerTokens")
		return
	}

	customerIDStr, ok := customerID.(string)
	if !ok {
		logger.FromContext(ctx).Error("Invalid customer ID type in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Invalid customer ID"),
		}), "CustomerPointsHandler::GetCustomerTokens")
		return
	}

	response, err := h.customerPointsService.GetCustomerTokens(ctx, customerIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerTokens -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(walletErrorCode(err), constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerTokens")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerTokens")
}

func (h *CustomerPointsHandler) GetCustomerWallet(c *gin.Context) {
	ctx := c.Request.Context()

	// Get customer ID from context (set by middleware)
	customerID, exists := c.Get("customer_id")
	if !exists {
		logger.FromContext(ctx).Error("Customer ID not found in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), "CustomerPointsHandler::GetCustomerWallet")
		return
	}

	customerIDStr, ok := customerID.(string)
	if !ok {
		logger.FromContext(ctx).Error("Invalid customer ID type in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Invalid customer ID"),
		}), "CustomerPointsHandler::GetCustomerWallet")
		return
	}

	response, err := h.customerPointsService.GetCustomerWallet(ctx, customerIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerWallet -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(walletErrorCode(err), constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerWallet")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerWallet")
}

func (h *CustomerPointsHandler) GetCustomerGames(c *gin.Context) {
	ctx := c.Request.Context()

	response, err := h.customerPointsService.GetCustomerGames(ctx)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerGames -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.InternalServerErrorCode, constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerGames")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerGames")
}

func (h *CustomerPointsHandler) GetFerrisWheelGame(c *gin.Context) {
	ctx := c.Request.Context()

	response, err := h.customerPointsService.GetFerrisWheelGame(ctx)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetFerrisWheelGame -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.InternalServerErrorCode, constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetFerrisWheelGame")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetFerrisWheelGame")
}

// GetCustomerWalletTransactions is GET /customer/wallet/transactions: the ledger, newest
// first, filterable by currency, type and date (docs/prd-point-coin.md F6).
func (h *CustomerPointsHandler) GetCustomerWalletTransactions(c *gin.Context) {
	ctx := c.Request.Context()

	customerID, ok := c.Get("customer_id")
	customerIDStr, isString := customerID.(string)
	if !ok || !isString {
		logger.FromContext(ctx).Error("Customer ID not found in context")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), "CustomerPointsHandler::GetCustomerWalletTransactions")
		return
	}

	var query models.ListCustomerWalletTransactionsQuery
	if err := c.ShouldBindQuery(&query); err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerWalletTransactions")
		return
	}

	response, err := h.customerPointsService.GetCustomerWalletTransactions(ctx, customerIDStr, query)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerWalletTransactions -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(walletErrorCode(err), constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerWalletTransactions")
		return
	}

	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerWalletTransactions")
}

// walletErrorCode tells a bad request apart from a server failure on the wallet
// endpoints.
func walletErrorCode(err error) string {
	switch {
	case errors.Is(err, processor.ErrInvalidWalletQuery):
		return constants.ValidationErrorCode
	case errors.Is(err, repository.ErrWalletNotFound):
		return constants.NotFoundErrorCode
	default:
		return constants.InternalServerErrorCode
	}
}

// GetCustomerWalletExpiring is GET /customer/wallet/expiring: what will expire, per
// currency and day (docs/prd-point-coin.md F6).
func (h *CustomerPointsHandler) GetCustomerWalletExpiring(c *gin.Context) {
	ctx := c.Request.Context()
	customerID, ok := c.Get("customer_id")
	customerIDStr, isString := customerID.(string)
	if !ok || !isString {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), "CustomerPointsHandler::GetCustomerWalletExpiring")
		return
	}
	response, err := h.customerPointsService.GetCustomerWalletExpiring(ctx, customerIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CustomerPointsHandler::GetCustomerWalletExpiring -> service call failed")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(walletErrorCode(err), constants.RequestEntity, err.Error()),
		}), "CustomerPointsHandler::GetCustomerWalletExpiring")
		return
	}
	util.HandleResponse(c.Writer, c.Request, contract.BuildSuccessResponse(response), "CustomerPointsHandler::GetCustomerWalletExpiring")
}