hamster-tycoon/handlers/hamster_handler.go

package handlers

import (
	"encoding/json"
	"github.com/gin-gonic/gin"
	"hamster-tycoon/storage/dao"
	"hamster-tycoon/storage/model"
	"hamster-tycoon/storage/validators"
	"hamster-tycoon/utils"
	"net/http"
)

func (hc *handlersContext) getAllHamsters(c *gin.Context) {
	hamsters, err := hc.db.GetAllHamsters()
	if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while getting hamsters")
		utils.JSONErrorWithMessage(c.Writer, model.ErrInternalServer, "Error while getting hamsters")
		return
	}
	utils.JSON(c.Writer, http.StatusOK, hamsters)
}

func (hc *handlersContext) getAHamster(c *gin.Context) {
	hamsterID := c.Param("hamsterId")

	err := hc.validator.VarCtx(c, hamsterID, "uuid4")
	if err != nil {
		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
		return
	}

	hamster, err := hc.db.GetHamsterById(hamsterID)
	if e, ok := err.(*dao.DAOError); ok {
		switch {
		case e.Type == dao.ErrTypeNotFound:
			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "Hamster not found")
			return
		default:
			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error GetHamster: get hamster error type not handled")
			utils.JSONError(c.Writer, model.ErrInternalServer)
			return
		}
	} else if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while get hamster")
		utils.JSONError(c.Writer, model.ErrInternalServer)
		return
	}

	if hamster == nil {
		utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "Hamster not found")
		return
	}

	utils.JSON(c.Writer, http.StatusOK, hamster)
}

func (hc *handlersContext) createAHamster(c *gin.Context) {
	b, err := c.GetRawData()
	if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while creating hamster, read data fail")
		utils.JSONError(c.Writer, model.ErrInternalServer)
		return
	}

	hamsterToCreate := model.Hamster{}
	err = json.Unmarshal(b, &hamsterToCreate)
	if err != nil {
		utils.JSONError(c.Writer, model.ErrBadRequestFormat)
		return
	}

	err = hc.validator.StructCtx(c, hamsterToCreate)
	if err != nil {
		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
		return
	}

	err = hc.db.CreateHamster(&hamsterToCreate)
	if e, ok := err.(*dao.DAOError); ok {
		switch {
		case e.Type == dao.ErrTypeDuplicate:
			utils.JSONErrorWithMessage(c.Writer, model.ErrAlreadyExists, "Hamster already exists")
			return
		default:
			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error CreateHamster: Error type not handled")
			utils.JSONError(c.Writer, model.ErrInternalServer)
			return
		}
	} else if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while creating hamster")
		utils.JSONError(c.Writer, model.ErrInternalServer)
		return
	}

	utils.JSON(c.Writer, http.StatusCreated, hamsterToCreate)
}

func (hc *handlersContext) updateAHamster(c *gin.Context) {
	panic("TO DO")
}

func (hc *handlersContext) deleteAHamster(c *gin.Context) {

	hamsterID := c.Param("hamsterId")

	err := hc.validator.VarCtx(c, hamsterID, "uuid4")
	if err != nil {
		utils.JSONError(c.Writer, validators.NewDataValidationAPIError(err))
		return
	}

	// check hamster id given in URL exists
	_, err = hc.db.GetHamsterById(hamsterID)
	if e, ok := err.(*dao.DAOError); ok {
		switch {
		case e.Type == dao.ErrTypeNotFound:
			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "Hamster to delete not found")
			return
		default:
			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error DeleteHamster: get hamster error type not handled")
			utils.JSONError(c.Writer, model.ErrInternalServer)
			return
		}
	} else if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while get hamster to delete")
		utils.JSONError(c.Writer, model.ErrInternalServer)
		return
	}

	err = hc.db.DeleteHamster(hamsterID)
	if e, ok := err.(*dao.DAOError); ok {
		switch {
		case e.Type == dao.ErrTypeNotFound:
			utils.JSONErrorWithMessage(c.Writer, model.ErrNotFound, "Hamster to delete not found")
			return
		default:
			utils.GetLoggerFromCtx(c).WithError(err).WithField("type", e.Type).Error("error DeleteHamster: Error type not handled")
			utils.JSONError(c.Writer, model.ErrInternalServer)
			return
		}
	} else if err != nil {
		utils.GetLoggerFromCtx(c).WithError(err).Error("error while deleting hamster")
		utils.JSONError(c.Writer, model.ErrInternalServer)
		return
	}

	utils.JSON(c.Writer, http.StatusNoContent, nil)

}