feat: ✨ added mvc code

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "name": "Launch",
+        "type": "go",
+        "request": "launch",
+        "mode": "debug",
+        "program": "${workspaceFolder}/main.go",
+        "env": {},
+        "args": []
+      }
+    ]
+  }
+  

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "cSpell.words": [
+        "Betrag",
+        "Kontobewegung"
+    ]
+}

go.mod

@@ -0,0 +1,3 @@
+module mvc
+
+go 1.23.2

interfaces/IObserver.go

@@ -0,0 +1,5 @@
+package interfaces
+
+type IObserver interface {
+	Update() error
+}

main.go

@@ -0,0 +1,14 @@
+package main
+
+import "mvc/objects"
+
+func main() {
+	model := objects.NewBankAccountModel()
+	view := objects.NewBankAccountView(model)
+	controller := objects.NewBankAccountController(model, view)
+
+	model.AddObserver(&view)
+
+	controller.Loop()
+
+}

objects/BankAccount.Model.go

@@ -0,0 +1,69 @@
+package objects
+
+import (
+	"errors"
+	"fmt"
+	"mvc/interfaces"
+)
+
+type BankAccountModel struct {
+	kontostand float64
+	observer   []interfaces.IObserver
+}
+
+func NewBankAccountModel() BankAccountModel {
+	return BankAccountModel{}
+}
+
+func (bm *BankAccountModel) GetBalance() float64 {
+	return bm.kontostand
+}
+
+func (bm *BankAccountModel) AddObserver(observer interfaces.IObserver) error {
+	bm.observer = append(bm.observer, observer)
+	return nil
+}
+
+func (bm *BankAccountModel) NotifyObserver() error {
+
+	if len(bm.observer) <= 0 {
+		return errors.New("no observer found")
+	}
+
+	for _, observer := range bm.observer {
+		observer.Update()
+	}
+
+	return nil
+}
+func (bm *BankAccountModel) Deposit(balance float64) error {
+
+	if balance <= 0 {
+		return errors.New("balance cannot be 0")
+	}
+
+	fmt.Printf("balance: %v", balance)
+
+	bm.kontostand += balance
+
+	fmt.Printf("balance: %v", bm.kontostand)
+
+	bm.NotifyObserver()
+	return nil
+}
+
+func (bm *BankAccountModel) Withdraw(balance float64) error {
+
+	if balance <= 0 {
+		return errors.New("balance cannot be 0")
+	}
+
+	fmt.Printf("balance: %v", balance)
+
+	bm.kontostand -= balance
+
+	fmt.Printf("balance: %v", bm.kontostand)
+
+	bm.NotifyObserver()
+	return nil
+}

objects/BankAccountController.go

@@ -0,0 +1,69 @@
+package objects
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type BankAccountController struct {
+	model   BankAccountModel
+	view    BankAccountView
+	scanner *bufio.Scanner
+}
+
+func NewBankAccountController(model BankAccountModel, view BankAccountView) BankAccountController {
+	return BankAccountController{
+		scanner: bufio.NewScanner(os.Stdin),
+		model:   model,
+		view:    view,
+	}
+}
+
+func (bc *BankAccountController) Loop() {
+	for {
+		// Update View
+		if err := bc.view.Update(); err != nil {
+			fmt.Println("Error updating view:", err)
+			return
+		}
+
+		// Eingabeaufforderung
+		fmt.Print("Enter command: ")
+
+		// Warte auf Benutzereingabe
+		if !bc.scanner.Scan() {
+			fmt.Println("Error reading input or EOF reached")
+			break
+		}
+
+		scannedString := strings.TrimSpace(bc.scanner.Text())
+		if len(scannedString) == 0 {
+			continue // Ignoriere leere Eingaben
+		}
+
+		fmt.Printf("First char: %c\n", scannedString[0])
+
+		// Befehl ausführen
+		switch scannedString[0] {
+		case '+':
+			amount, err := strconv.ParseFloat(scannedString[1:], 64)
+			if err != nil {
+				panic(fmt.Sprintf("Failed to parse float: %v\n", err))
+			}
+
+			bc.model.Deposit(amount)
+		case '-':
+			amount, err := strconv.ParseFloat(scannedString[1:], 64)
+			if err != nil {
+				panic(fmt.Sprintf("Failed to parse float: %v\n", err))
+			}
+
+			bc.model.Withdraw(amount)
+		default:
+			fmt.Println("No command recognized")
+		}
+	}
+}

objects/BankAccountView.go

@@ -0,0 +1,25 @@
+package objects
+
+import (
+	"fmt"
+	"mvc/interfaces"
+)
+
+type BankAccountView struct {
+	model BankAccountModel
+}
+
+var _ interfaces.IObserver = &BankAccountView{}
+
+func NewBankAccountView(model BankAccountModel) BankAccountView {
+	return BankAccountView{
+		model: model,
+	}
+}
+
+func (bv *BankAccountView) Update() error {
+	fmt.Print("\033[H\033[2J")
+	fmt.Printf("Kontostand: %v\n", bv.model.GetBalance())
+	fmt.Println("Bitte Kontobewegung eingeben: [+ = Einzahlung / - = Abhebung] + Betrag (ex. +100.0)")
+	return nil
+}