refactor records to implement AppConfig

data/records.go

@@ -14,12 +14,22 @@ type Record struct {
 
 // AppContext is the application data store that holds Records
 type AppContext struct {
-	Records []Record
+	Records  []Record
+	dataPath string
+}
+
+func NewContext(dataPath string) (AppContext, error) {
+	ctx := AppContext{dataPath: dataPath}
+	err := ctx.LoadRecords()
+	if err != nil {
+		return AppContext{}, err
+	}
+	return ctx, nil
 }
 
 // LoadRecords will load records from file
-func (ctx *AppContext) LoadRecords(filename string) error {
-	data, err := os.ReadFile(filename)
+func (ctx *AppContext) LoadRecords() error {
+	data, err := os.ReadFile(ctx.dataPath)
 	if err != nil {
 		return err
 	}
@@ -27,12 +37,12 @@ func (ctx *AppContext) LoadRecords(filename string) error {
 }
 
 // SaveRecords will save records to a file
-func (ctx *AppContext) SaveRecords(filename string) error {
+func (ctx *AppContext) SaveRecords() error {
 	jsonData, err := json.Marshal(ctx.Records)
 	if err != nil {
 		return err
 	}
-	return os.WriteFile(filename, jsonData, 0660)
+	return os.WriteFile(ctx.dataPath, jsonData, 0660)
 }
 
 // AddReading will add a Reading to the AppContext