package auth

import (
	"nixcn-cms/internal/exception"
	"nixcn-cms/service/service_auth"
	"nixcn-cms/utils"

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

// Exchange handles the authorization code swap process.
// @Summary      Exchange Auth Code
// @Description  Exchanges client credentials and user session for a specific redirect authorization code.
// @Tags         Authentication
// @Accept       json
// @Produce      json
// @Param        payload  body      service_auth.ExchangeData  true  "Exchange Request Credentials"
// @Success      200      {object}  service_auth.ExchangeResult
// @Failure      400      {string}  string "Invalid Input"
// @Failure      401      {string}  string "Unauthorized"
// @Failure      500      {string}  string "Internal Server Error"
// @Security     ApiKeyAuth
// @Router       /auth/exchange [post]
func (self *AuthHandler) Exchange(c *gin.Context) {
	var exchangeData service_auth.ExchangeData

	if err := c.ShouldBindJSON(&exchangeData); err != nil {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceAuth).
			SetEndpoint(exception.EndpointAuthServiceExchange).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			SetError(err).
			Throw(c).
			String()

		utils.HttpResponse(c, 400, errorCode)
		return
	}

	userIdOrig, ok := c.Get("user_id")
	if !ok {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceAuth).
			SetEndpoint(exception.EndpointAuthServiceExchange).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorUnauthorized).
			SetError(nil).
			Throw(c).
			String()

		utils.HttpResponse(c, 401, errorCode)
		return
	}

	userId, err := uuid.Parse(userIdOrig.(string))
	if err != nil {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusServer).
			SetService(exception.ServiceAuth).
			SetEndpoint(exception.EndpointAuthServiceExchange).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorUuidParseFailed).
			SetError(err).
			Throw(c).
			String()

		utils.HttpResponse(c, 500, errorCode)
		return
	}

	result := self.svc.Exchange(&service_auth.ExchangePayload{
		Context: c,
		UserId:  userId,
		Data:    &exchangeData,
	})

	if result.Common.Exception.Original != exception.CommonSuccess {
		utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String())
		return
	}

	utils.HttpResponse(c, 200, result.Common.Exception.String(), result.Data)
}