add scene save and load in quasar backend

backend/scenes/scenes.go

@@ -0,0 +1,195 @@
+package secenes
+
+import (
+	"backend/models"
+	"backend/utils"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"sort"
+
+	"github.com/gin-gonic/gin"
+)
+
+type ScenesHandler struct {
+	dir string
+}
+
+func NewScenesHandler(dir string) *ScenesHandler {
+	if dir == "" {
+		dir = "./scenes"
+	}
+	return &ScenesHandler{
+		dir: dir,
+	}
+}
+
+func (sh *ScenesHandler) SaveScene(c *gin.Context) {
+	body, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	var scene models.Scene
+	err = json.Unmarshal(body, &scene)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	if _, err := os.Stat(path.Join(sh.dir)); err != nil {
+		os.MkdirAll(sh.dir, 666)
+	}
+
+	f, err := os.OpenFile(path.Join(sh.dir, scene.Name+".scene"), os.O_CREATE|os.O_TRUNC|os.O_RDWR, 666)
+
+	_, err = f.Write(body)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+	defer f.Close()
+
+	c.JSON(http.StatusOK, gin.H{
+		"message": fmt.Sprintf("Scene '%s' saved", scene.Name),
+	})
+}
+
+func (sh *ScenesHandler) DeleteScene(c *gin.Context) {
+	body, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	var scene models.Scene
+	err = json.Unmarshal(body, &scene)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	err = os.Remove(path.Join(sh.dir, scene.Name+".scene"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"message": fmt.Sprintf("Scene '%s' deleted", scene.Name),
+	})
+}
+
+func (sh *ScenesHandler) LoadScenes(c *gin.Context) {
+	sceneMap := make(map[string]models.Scene)
+
+	files, err := utils.FindAllFiles("./scenes", ".scene")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	for _, f := range files {
+		content, err := os.ReadFile(f)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{
+				"error": err.Error(),
+			})
+			return
+		}
+		var scene models.Scene
+		err = json.Unmarshal(content, &scene)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{
+				"error": err.Error(),
+			})
+			return
+		}
+		sceneMap[scene.Name] = scene
+	}
+
+	//sort scenes alphabetacally by name
+	keys := make([]string, 0, len(sceneMap))
+	for key := range sceneMap {
+		keys = append(keys, key)
+	}
+
+	// Sort keys alphabetically
+	sort.Strings(keys)
+
+	var scenes []models.Scene
+	//  Iterate over sorted keys
+	for _, key := range keys {
+		scenes = append(scenes, sceneMap[key])
+	}
+
+	c.JSON(http.StatusOK, scenes)
+}
+
+func (sh *ScenesHandler) LoadScene(c *gin.Context) {
+	body, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	var scene models.Scene
+	err = json.Unmarshal(body, &scene)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	files, err := utils.FindAllFiles("./scenes", ".scene")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	for _, f := range files {
+		if filepath.Base(f) != scene.Name+".scene" {
+			continue
+		}
+		content, err := os.ReadFile(f)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{
+				"error": err.Error(),
+			})
+			return
+		}
+
+		err = json.Unmarshal(content, &scene)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{
+				"error": err.Error(),
+			})
+			return
+		}
+	}
+	c.JSON(http.StatusOK, scene)
+}