res_levis_backend/internal/pkg/controller/gateways_controller.go

package controller

import (
	"context"
	"encoding/json"
	"log/slog"
	"net/http"
	"strconv"

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

func GatewayAddController(db *gorm.DB, context context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var gateway model.Gateway
		if err := json.NewDecoder(r.Body).Decode(&gateway); err != nil {
			response.BadRequest(w, "invalid request body")
			return
		}
		if err := validation.Struct(&gateway); err != nil {
			response.BadRequest(w, err.Error())
			return
		}

		if err := db.WithContext(context).Create(&gateway).Error; err != nil {
			response.InternalError(w, "failed to create gateway", err)
			return
		}

		response.JSON(w, http.StatusCreated, map[string]string{"status": "created"})
	}
}

func GatewayListController(db *gorm.DB, context context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		query := r.URL.Query()

		lStr := query.Get("limit")
		if lStr == "" {
			lStr = "100"
		}
		limit, err := strconv.Atoi(lStr)
		if err != nil {
			slog.Error("invalid limit parameter", "value", lStr)
			response.BadRequest(w, "invalid limit parameter")
			return
		}

		oStr := query.Get("offset")
		if oStr == "" {
			oStr = "0"
		}
		offset, err := strconv.Atoi(oStr)
		if err != nil {
			slog.Error("invalid offset parameter", "value", oStr)
			response.BadRequest(w, "invalid offset parameter")
			return
		}

		var gateways []model.Gateway
		if err := db.WithContext(context).Limit(limit).Offset(offset).Find(&gateways).Error; err != nil {
			response.InternalError(w, "failed to list gateways", err)
			return
		}

		response.JSON(w, http.StatusOK, gateways)
	}
}

func GatewayDeleteController(db *gorm.DB, context context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		res := db.WithContext(context).Delete(&model.Gateway{}, "id = ?", id)
		if res.RowsAffected == 0 {
			response.NotFound(w, "gateway not found")
			return
		}
		if res.Error != nil {
			response.InternalError(w, "failed to delete gateway", res.Error)
			return
		}

		response.JSON(w, http.StatusOK, map[string]string{"status": "deleted"})
	}
}

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

		if err := db.WithContext(context).First(&model.Gateway{}, "id = ?", id).Error; err != nil {
			response.NotFound(w, "gateway not found")
			return
		}

		var gateway model.Gateway
		if err := json.NewDecoder(r.Body).Decode(&gateway); err != nil {
			response.BadRequest(w, "invalid request body")
			return
		}
		if err := validation.Struct(&gateway); err != nil {
			response.BadRequest(w, err.Error())
			return
		}

		if err := db.WithContext(context).Save(&gateway).Error; err != nil {
			response.InternalError(w, "failed to update gateway", err)
			return
		}

		response.JSON(w, http.StatusOK, map[string]string{"status": "updated"})
	}
}