Add collection and history saving

models/collection/CollectionHandler.go

@@ -22,3 +22,29 @@ func ReadFileAndConvertToCollection(filePath string) (*NML, error) {
 
 	return &collection, nil
 }
+func CollectionFromString(content string) (*NML, error) {
+	// Unmarshal the XML content into the Collection struct
+	var collection NML
+	err := xml.Unmarshal([]byte(content), &collection)
+	if err != nil {
+		return nil, err
+	}
+
+	return &collection, nil
+}
+
+func SaveCollectionToFile(collection *NML, filePath string) error {
+	// Marshal the Collection struct into XML content
+	content, err := xml.MarshalIndent(collection, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	// Write the XML content to the file
+	err = os.WriteFile(filePath, content, 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

models/history/HistoryHandler.go

@@ -30,6 +30,22 @@ func ReadFileAndConvertToHistory(filePath string) (*NML, error) {
 	return nil, errors.New("file is not a history file")
 }
 
+func HistoryFromString(content string) (*NML, error) {
+	// Unmarshal the XML content into the NML struct
+	var nml NML
+	err := xml.Unmarshal([]byte(content), &nml)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if the file is a history file based on the content
+	if IsHistoryString(content) {
+		return &nml, nil
+	}
+
+	return nil, errors.New("file is not a history file")
+}
+
 func IsHistoryFile(path string) bool {
 	content, err := os.ReadFile(path)
 	if err != nil {
@@ -37,3 +53,23 @@ func IsHistoryFile(path string) bool {
 	}
 	return strings.Contains(string(content), "HistoryData")
 }
+
+func IsHistoryString(content string) bool {
+	return strings.Contains(content, "HistoryData")
+}
+
+func SaveHistoryToFile(history *NML, filePath string) error {
+	// Marshal the NML struct into XML content
+	content, err := xml.MarshalIndent(history, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	// Write the XML content to the file
+	err = os.WriteFile(filePath, content, 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}