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go.mod

@@ -0,0 +1,5 @@
+module task-manager-api
+
+go 1.26.6
+
+require github.com/google/uuid v1.6.0 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=

haekal.go

@@ -0,0 +1,203 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"sync"
+
+	"github.com/google/uuid"
+)
+
+type Task struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+type TaskStore struct {
+	mu    sync.RWMutex
+	tasks map[string]Task
+}
+
+func NewTaskStore() *TaskStore {
+	return &TaskStore{
+		tasks: make(map[string]Task),
+	}
+}
+
+func (s *TaskStore) Create(name string) Task {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	id := uuid.New().String()
+	task := Task{
+		ID:   id,
+		Name: name,
+	}
+	s.tasks[id] = task
+	return task
+}
+
+func (s *TaskStore) GetAll() []Task {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	// Guarantee an initialized, non-nil slice to serialize as [] instead of null
+	taskList := make([]Task, 0, len(s.tasks))
+	for _, task := range s.tasks {
+		taskList = append(taskList, task)
+	}
+	return taskList
+}
+
+func (s *TaskStore) GetByID(id string) (Task, bool) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	task, exists := s.tasks[id]
+	return task, exists
+}
+
+func (s *TaskStore) Update(id string, name string) (Task, bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, exists := s.tasks[id]; !exists {
+		return Task{}, false
+	}
+
+	task := Task{
+		ID:   id,
+		Name: name,
+	}
+	s.tasks[id] = task
+	return task, true
+}
+
+func (s *TaskStore) Delete(id string) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, exists := s.tasks[id]; !exists {
+		return false
+	}
+
+	delete(s.tasks, id)
+	return true
+}
+
+type Server struct {
+	store *TaskStore
+}
+
+func writeJSONResponse(w http.ResponseWriter, statusCode int, data interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	if data != nil {
+		json.NewEncoder(w).Encode(data)
+	}
+}
+
+func writeJSONError(w http.ResponseWriter, statusCode int, message string) {
+	writeJSONResponse(w, statusCode, map[string]string{"error": message})
+}
+
+// Handler for /tasks (POST, GET)
+func (s *Server) handleTasks(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodGet:
+		tasks := s.store.GetAll()
+		writeJSONResponse(w, http.StatusOK, tasks)
+
+	case http.MethodPost:
+		var req struct {
+			Name string `json:"name"`
+		}
+
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeJSONError(w, http.StatusBadRequest, "Invalid JSON body")
+			return
+		}
+
+		if strings.TrimSpace(req.Name) == "" {
+			writeJSONError(w, http.StatusBadRequest, "Name field is required and cannot be empty")
+			return
+		}
+
+		task := s.store.Create(req.Name)
+		writeJSONResponse(w, http.StatusCreated, task)
+
+	default:
+		writeJSONError(w, http.StatusMethodNotAllowed, "Method not allowed")
+	}
+}
+
+// Handler for /tasks/{id} (GET, PUT, DELETE)
+func (s *Server) handleTaskByID(w http.ResponseWriter, r *http.Request) {
+	id := strings.TrimPrefix(r.URL.Path, "/tasks/")
+	if id == "" || strings.Contains(id, "/") {
+		writeJSONError(w, http.StatusBadRequest, "Invalid ID path")
+		return
+	}
+
+	switch r.Method {
+	case http.MethodGet:
+		task, found := s.store.GetByID(id)
+		if !found {
+			writeJSONError(w, http.StatusNotFound, "Task not found")
+			return
+		}
+		writeJSONResponse(w, http.StatusOK, task)
+
+	case http.MethodPut:
+		var req struct {
+			Name string `json:"name"`
+		}
+
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeJSONError(w, http.StatusBadRequest, "Invalid JSON body")
+			return
+		}
+
+		if strings.TrimSpace(req.Name) == "" {
+			writeJSONError(w, http.StatusBadRequest, "Name field is required and cannot be empty")
+			return
+		}
+
+		task, updated := s.store.Update(id, req.Name)
+		if !updated {
+			writeJSONError(w, http.StatusNotFound, "Task not found")
+			return
+		}
+		writeJSONResponse(w, http.StatusOK, task)
+
+	case http.MethodDelete:
+		deleted := s.store.Delete(id)
+		if !deleted {
+			writeJSONError(w, http.StatusNotFound, "Task not found")
+			return
+		}
+		// Must output exactly 204 with no body
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		writeJSONError(w, http.StatusMethodNotAllowed, "Method not allowed")
+	}
+}
+
+func main() {
+	server := &Server{
+		store: NewTaskStore(),
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/tasks", server.handleTasks)
+	mux.HandleFunc("/tasks/", server.handleTaskByID)
+
+	fmt.Println("Server running on port 8080...")
+	if err := http.ListenAndServe(":8080", mux); err != nil {
+		panic(err)
+	}
+}