README.md

@@ -22,11 +22,3 @@ Reading data will be saved to `$HOME/.ketotrack/readings.json`.
 go build
 mv ketotrack $HOME/.local/bin
 ```
-
-## Refactoring Notes
-- [X] Create `Record` and `Note` struct types
-- [X] Add `GKI` field to `Reading` struct type
-- [X] Encapsulate application data with an `AppContext` struct that holds a `Records` slice
-  - [X] `LoadRecords`, `SaveRecords`, `AddReading`, `AddNote` receiver methods
-- [X] Add interactive menu for adding either a `Note` or a `Record`
-- [ ] Standardize method names for getting user input to `handleNewNote` and `handleNewReading`

main.go

@@ -12,7 +12,7 @@ import (
 	"time"
 )
 
-var recordsFilename string
+var readingsFilename string
 
 func init() {
 	// Get user's homeDir directory
@@ -33,27 +33,7 @@ func init() {
 	}
 
 	// Set data file path for readings
-	recordsFilename = filepath.Join(ketotrackDir, "records.json")
-}
-
-// Record holds a pointer to a Reading or Note.
-type Record struct {
-	Reading *Reading `json:"reading,omitempty"`
-	Note    *Note    `json:"note,omitempty"`
-}
-
-// Note holds a text note along with the time the note was taken.
-type Note struct {
-	Time time.Time `json:"time"`
-	Text string    `json:"text"`
-}
-
-// NewNote returns a new Note
-func NewNote(text string) Note {
-	return Note{
-		Time: time.Now(),
-		Text: text,
-	}
+	readingsFilename = filepath.Join(ketotrackDir, "readings.json")
 }
 
 // Reading holds the glucose and ketone level measurements along with the time the measurements were taken.
@@ -61,124 +41,89 @@ type Reading struct {
 	Time    time.Time `json:"time"`
 	Glucose float64   `json:"glucose"`
 	Ketone  float64   `json:"ketone"`
-	GKI     float64   `json:"GKI"`
 }
 
 // NewReading creates and returns a new Reading instance with the provided glucose and ketone levels, and records
 // the current time. The glucose value should be provided in mg/dL, while the ketone level should be in mmol/L.
 func NewReading(glucose, ketone float64) Reading {
-	var gki float64
-	if ketone == 0 {
-		gki = 0
-	} else {
-		gki = (glucose / 18) / ketone
-	}
-
 	return Reading{
 		Time:    time.Now(),
 		Glucose: glucose,
 		Ketone:  ketone,
-		GKI:     gki,
 	}
 }
 
-// AppContext is the application data store that holds Records
-type AppContext struct {
-	Records []Record
+// GKI calculates and returns the Glucose Ketone Index of the reading.
+// The Glucose Ketone Index helps determine the efficiency of glucose and ketone levels within the body. It is
+// calculated as (glucose level in mg/dL / 18) divided by the ketone level.
+func (r Reading) GKI() (float64, error) {
+	if r.Ketone == 0 {
+		return 0, errors.New("ketone level must not be zero to calculate GKI")
+	}
+	return (r.Glucose / 18) / r.Ketone, nil
 }
 
-// LoadRecords will load records from file
-func (ctx *AppContext) LoadRecords(filename string) error {
-	data, err := os.ReadFile(filename)
+func main() {
+	// Take a new reading from the user
+	reading, err := getReading()
 	if err != nil {
-		return err
-	}
-	return json.Unmarshal(data, &ctx.Records)
+		fmt.Println(err.Error())
+		return
 	}
 
-// SaveRecords will save records to a file
-func (ctx *AppContext) SaveRecords(filename string) error {
-	jsonData, err := json.Marshal(ctx.Records)
+	// Calculate GKI
+	gki, err := reading.GKI()
+	if err != nil {
+		fmt.Println(err.Error())
+		fmt.Println("You are not in ketosis.")
+		return
+	}
+	fmt.Printf("\nYour GKI is: %0.2f\n", gki)
+
+	// Display level of ketosis
+	switch {
+	case gki <= 1:
+		fmt.Println("You're in the highest level of ketosis.")
+	case gki < 3:
+		fmt.Println("You're in a high therapeutic level of ketosis.")
+	case gki < 6:
+		fmt.Println("You're in a moderate level of ketosis.")
+	case gki <= 9:
+		fmt.Println("You're in a low level of ketosis.")
+	default:
+		fmt.Println("You are not in ketosis.")
+	}
+
+	// Save latest reading to readings file
+	readings, _ := loadReadingsFromFile(readingsFilename)
+	readings = append(readings, reading)
+	err = saveReadingsToFile(readingsFilename, readings)
+	if err != nil {
+		fmt.Printf("error saving data: %s\n", err.Error())
+	}
+}
+
+func saveReadingsToFile(filename string, data []Reading) error {
+	jsonData, err := json.Marshal(data)
 	if err != nil {
 		return err
 	}
 	return os.WriteFile(filename, jsonData, 0660)
 }
 
-// AddReading will add a Reading to the AppContext
-func (ctx *AppContext) AddReading(reading Reading) {
-	ctx.Records = append(ctx.Records, Record{Reading: &reading})
-}
-
-// AddNote will a add a Note to the AppContext
-func (ctx *AppContext) AddNote(note Note) {
-	ctx.Records = append(ctx.Records, Record{Note: &note})
-}
-
-func main() {
-	// TODO: Clean up menu prompt
-	// TODO: Write getNote method
-	// TODO: Write option handlers (handleNewNote, handleNewReading)
-
-	var appCtx AppContext
-
-	if err := appCtx.LoadRecords(recordsFilename); err != nil {
-		fmt.Printf("Error loading records from file: %s\n", err)
-	}
-
-	for {
-		choice, err := getUserInput("1. Enter new reading\n2. Enter new note\n3. Exit\nYour choice")
+func loadReadingsFromFile(filename string) ([]Reading, error) {
+	data, err := os.ReadFile(filename)
 	if err != nil {
-			fmt.Printf("Error reading choice: %s\n", err)
-			continue
+		return nil, err
 	}
 
-		if choice == "3" {
-			fmt.Println("Exiting...")
-			break
-		}
-
-		switch choice {
-		case "1":
-			// Get a new Reading from the user
-			reading, err := getReading()
+	var readings []Reading
+	err = json.Unmarshal(data, &readings)
 	if err != nil {
-				fmt.Printf("Error getting reading: %s\n", err)
-			} else {
-				// Display GKI and level of ketosis
-				fmt.Printf("\nYour GKI is: %0.2f\n", reading.GKI)
-				switch {
-				case reading.GKI <= 1:
-					fmt.Println("You're in the highest level of ketosis.")
-				case reading.GKI < 3:
-					fmt.Println("You're in a high therapeutic level of ketosis.")
-				case reading.GKI < 6:
-					fmt.Println("You're in a moderate level of ketosis.")
-				case reading.GKI <= 9:
-					fmt.Println("You're in a low level of ketosis.")
-				default:
-					fmt.Println("You are not in ketosis.")
-				}
-				appCtx.AddReading(reading)
-			}
-		case "2":
-			// Get a new Note from the user
-			noteText, err := getUserInput("Enter your note text: ")
-			if err != nil {
-				fmt.Printf("Error getting note: %s\n", err)
-			} else {
-				note := NewNote(noteText)
-				appCtx.AddNote(note)
-			}
-		default:
-			fmt.Printf("Invalid choice, please try again.\n\n")
-		}
+		return nil, err
 	}
 
-	// Save Records before exiting
-	if err := appCtx.SaveRecords(recordsFilename); err != nil {
-		fmt.Printf("Error saving records to file: %s\n", err)
-	}
+	return readings, nil
 }
 
 func getReading() (Reading, error) {

main_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"math"
+	"testing"
+)
+
+func TestGKI(t *testing.T) {
+	r := Reading{
+		Glucose: 77,
+		Ketone:  1.1,
+	}
+	expected := (77.0 / 18) / 1.1
+	epsilon := 0.0001 // Tolerance level
+	gki, _ := r.GKI()
+
+	if math.Abs(gki-expected) > epsilon {
+		t.Errorf("expected %v, got %v", expected, gki)
+	}
+}