res_levis_backend/internal/pkg/controller/settings_controller.go

package controller

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

	"github.com/AFASystems/presence/internal/pkg/model"
	"github.com/segmentio/kafka-go"
	"gorm.io/gorm"
)

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

		w.Write(res)
	}
}

func SettingsUpdateController(db *gorm.DB, writer *kafka.Writer, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var updates map[string]any
		if err := json.NewDecoder(r.Body).Decode(&updates); err != nil {
			http.Error(w, "Invalid JSON", 400)
			return
		}

		inMsg := fmt.Sprintf("updates: %+v", updates)
		slog.Info(inMsg)

		if err := db.Model(&model.Settings{}).Where("id = ?", 1).Updates(updates).Error; err != nil {
			msg := fmt.Sprintf("Error in updating settings: %v", err)
			slog.Error(msg)
			http.Error(w, err.Error(), 500)
			return
		}

		eMsg, err := json.Marshal(updates)
		if err != nil {
			http.Error(w, "Error in marshaling settings updates", 400)
			msg := fmt.Sprintf("Error in marshaling settings updates: %v", err)
			slog.Error(msg)
			return
		}

		msg := kafka.Message{
			Value: eMsg,
		}

		if err := writer.WriteMessages(ctx, msg); err != nil {
			slog.Error("writing settings to Kafka", "err", err)
			http.Error(w, "Failed to publish settings update", 500)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		w.Write([]byte(`{"status":"Settings updated"}`))
	}
}