data package handles AppContext and Records

data/records.go

@@ -0,0 +1,46 @@
+package data
+
+import (
+	"encoding/json"
+	"ketotrack/model"
+	"os"
+)
+
+// Record holds a pointer to a Reading or Note.
+type Record struct {
+	Reading *model.Reading `json:"reading,omitempty"`
+	Note    *model.Note    `json:"note,omitempty"`
+}
+
+// AppContext is the application data store that holds Records
+type AppContext struct {
+	Records []Record
+}
+
+// LoadRecords will load records from file
+func (ctx *AppContext) LoadRecords(filename string) error {
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(data, &ctx.Records)
+}
+
+// SaveRecords will save records to a file
+func (ctx *AppContext) SaveRecords(filename string) error {
+	jsonData, err := json.Marshal(ctx.Records)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(filename, jsonData, 0660)
+}
+
+// AddReading will add a Reading to the AppContext
+func (ctx *AppContext) AddReading(reading model.Reading) {
+	ctx.Records = append(ctx.Records, Record{Reading: &reading})
+}
+
+// AddNote will a add a Note to the AppContext
+func (ctx *AppContext) AddNote(note model.Note) {
+	ctx.Records = append(ctx.Records, Record{Note: &note})
+}