todo app

internal/services/tasks.go

@@ -0,0 +1,47 @@
+package services
+
+import "fmt"
+
+type taskService struct {
+	tasks map[int]string
+}
+
+func NewTaskService() *taskService {
+	return &taskService{
+		tasks: make(map[int]string, 0),
+	}
+}
+
+func (r *taskService) Insert(key int, v string) error {
+	if _, found := r.tasks[key]; found {
+		return fmt.Errorf("already exist %d", key)
+	}
+	r.tasks[key] = v
+	return nil
+}
+func (r *taskService) List() map[int]string {
+	return r.tasks
+}
+
+func (r *taskService) Show(key int) string {
+	if task, found := r.tasks[key]; found {
+		return task
+	}
+	return ""
+}
+
+func (r *taskService) Delete(key int) error {
+	if _, found := r.tasks[key]; !found {
+		return fmt.Errorf("task with key %d not found", key)
+	}
+	delete(r.tasks, key)
+	return nil
+}
+
+func (r *taskService) Update(key int, newTask string) error {
+	if _, found := r.tasks[key]; !found {
+		return fmt.Errorf("task with key %d not found", key)
+	}
+	r.tasks[key] = newTask
+	return nil
+}