res_levis_backend/internal/pkg/controller/gateways_controller.go

package controller

import (
	"encoding/json"
	"net/http"

	"github.com/AFASystems/presence/internal/pkg/model"
	"github.com/gorilla/mux"
	"gorm.io/gorm"
)

func GatewayAddController(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		decoder := json.NewDecoder(r.Body)
		var gateway model.Gateway

		if err := decoder.Decode(&gateway); err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		db.Create(&gateway)
		w.Write([]byte("ok"))
	}
}

func GatewayListController(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var gateways []model.Gateway
		db.Find(&gateways)
		res, err := json.Marshal(gateways)
		if err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		w.Write(res)
	}
}

func GatewayDeleteController(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		if res := db.Delete(&model.Gateway{}, "id = ?", id); res.RowsAffected == 0 {
			http.Error(w, "no gateway with such ID found", 400)
			return
		}

		w.Write([]byte("ok"))
	}
}

func GatewayUpdateController(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]

		if err := db.First(&model.Gateway{}, "id = ?", id).Error; err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		decoder := json.NewDecoder(r.Body)
		var gateway model.Gateway

		if err := decoder.Decode(&gateway); err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		db.Save(&gateway)
		w.Write([]byte("ok"))
	}
}