tsk-8: Create Message endpoint (#15)

Closes #8

Reviewed-on: phoenix/textsender-api#15
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/handler/endpoint/endpoint.go

@@ -1,4 +1,5 @@
 package endpoint
 
 const MESSAGE_DRAFT_ENDPOINT = "/api/v1/message/draft"
+const ADD_MESSAGE = "/api/v1/message/new"
 const ADD_CONTACT_ENDPOINT = "/api/v1/contact"

internal/handler/message.go

@@ -0,0 +1,72 @@
+package handler
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/google/uuid"
+
+	"git.kundeng.us/phoenix/textsender-api/internal/store"
+	"git.kundeng.us/phoenix/textsender-models/pkg/message"
+)
+
+type RequestAddMessage struct {
+	Content string    `json:"content"`
+	UserId  uuid.UUID `json:"user_id"`
+}
+
+type AddMessageResponse struct {
+	Message string            `json:"message"`
+	Data    []message.Message `json:"data"`
+}
+
+type MessageHandler struct {
+	MessageStore store.MessageStore
+}
+
+func NewMessageHandler(str store.MessageStore) *MessageHandler {
+	return &MessageHandler{MessageStore: str}
+}
+
+func (m *MessageHandler) AddMessage(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req RequestAddMessage
+	if err := ExtractFromRequest(r, &req); err != nil {
+		http.Error(w, "Invalid JSON: "+err.Error(), http.StatusBadRequest)
+	}
+	defer r.Body.Close()
+
+	newMessage := message.Message{Content: req.Content, UserId: req.UserId}
+
+	var statusCode int
+	var resp AddMessageResponse
+
+	ctx := r.Context()
+
+	if exists, err := m.MessageStore.MessageExists(ctx, &newMessage); err != nil {
+		fmt.Println("Error: ", err)
+		statusCode = http.StatusInternalServerError
+		resp.Message = err.Error()
+	} else {
+		if exists {
+			statusCode = http.StatusBadRequest
+			resp.Message = "Cannot create message"
+		} else {
+			if err = m.MessageStore.CreateMessage(ctx, &newMessage); err != nil {
+				fmt.Println("Error:", err)
+				statusCode = http.StatusInternalServerError
+				resp.Message = err.Error()
+			} else {
+				statusCode = http.StatusCreated
+				resp.Message = "Message created"
+				resp.Data = append(resp.Data, newMessage)
+			}
+		}
+	}
+
+	RespondWithJSON(w, statusCode, &resp)
+}

internal/handler/message_test.go

@@ -0,0 +1,43 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+
+	"git.kundeng.us/phoenix/textsender-api/internal/handler/endpoint"
+)
+
+type CreateMessageRequest struct {
+	Content string    `json:"content"`
+	UserId  uuid.UUID `json:"user_id"`
+}
+
+func TestCreateMessageWithMock(t *testing.T) {
+	mockStore := NewMockMessageStore()
+	handler := NewMessageHandler(mockStore)
+
+	testUserId := uuid.New()
+	testBody := CreateMessageRequest{Content: "Who could tell?", UserId: testUserId}
+	jsonValue, _ := json.Marshal(testBody)
+
+	req, _ := http.NewRequest("POST", endpoint.ADD_MESSAGE, strings.NewReader(string(jsonValue)))
+	rr := httptest.NewRecorder()
+
+	handler.AddMessage(rr, req)
+
+	assert.Equal(t, http.StatusCreated, rr.Code)
+
+	var response AddMessageResponse
+	err := json.Unmarshal(rr.Body.Bytes(), &response)
+	assert.NoError(t, err, "Error Creating message %v", err)
+
+	assert.NotEmpty(t, response.Data, "No Message created")
+
+	assert.NotNil(t, response.Data[0].Id, "Id should not be nil")
+}

internal/handler/mock_store_test.go

@@ -8,6 +8,7 @@ import (
 	"github.com/google/uuid"
 
 	"git.kundeng.us/phoenix/textsender-models/pkg/contact"
+	"git.kundeng.us/phoenix/textsender-models/pkg/message"
 )
 
 type Key struct {
@@ -115,3 +116,57 @@ func (m *MockContactStore) ContactExists(ctx context.Context, phoneNumber string
 
 	return exists, nil
 }
+
+type MessageKey struct {
+	Content string
+	UserId  uuid.UUID
+}
+
+type MockMessageStore struct {
+	Messages      map[uuid.UUID]*message.Message
+	MessagesByKey map[MessageKey]*message.Message
+	mu            sync.RWMutex
+	Error         error // Optional: simulate errors
+}
+
+func NewMockMessageStore() *MockMessageStore {
+	return &MockMessageStore{
+		Messages:      make(map[uuid.UUID]*message.Message),
+		MessagesByKey: make(map[MessageKey]*message.Message),
+	}
+}
+
+func (m *MockMessageStore) CreateMessage(ctx context.Context, msg *message.Message) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return m.Error
+	}
+
+	if msg.Id == uuid.Nil {
+		msg.Id = uuid.New()
+	}
+
+	key := MessageKey{Content: msg.Content, UserId: msg.UserId}
+	if _, exists := m.MessagesByKey[key]; exists {
+		return errors.New("Message already exists")
+	}
+
+	m.Messages[msg.Id] = msg
+	m.MessagesByKey[key] = msg
+	return nil
+}
+
+func (m *MockMessageStore) MessageExists(ctx context.Context, msg *message.Message) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return false, m.Error
+	}
+
+	_, exists := m.MessagesByKey[MessageKey{Content: msg.Content, UserId: msg.UserId}]
+
+	return exists, nil
+}

internal/store/message.go

@@ -0,0 +1,47 @@
+package store
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.kundeng.us/phoenix/textsender-models/pkg/message"
+)
+
+type MessageStore interface {
+	CreateMessage(ctx context.Context, msg *message.Message) error
+	MessageExists(ctx context.Context, msg *message.Message) (bool, error)
+}
+
+type PGMessageStore struct {
+	db *pgxpool.Pool
+}
+
+func NewMessageStore(db *pgxpool.Pool) *PGMessageStore {
+	return &PGMessageStore{db: db}
+}
+
+func (m *PGMessageStore) CreateMessage(ctx context.Context, msg *message.Message) error {
+	query := `
+	INSERT INTO messages (content, user_id)
+	VALUES ($1, $2)
+	RETURNING id
+	`
+
+	return m.db.QueryRow(ctx, query, msg.Content, msg.UserId).Scan(
+		&msg.Id,
+	)
+}
+
+func (m *PGMessageStore) MessageExists(ctx context.Context, msg *message.Message) (bool, error) {
+	query := `SELECT EXISTS(SELECT 1 FROM messages WHERE content = $1 AND user_id = $2)`
+
+	var exists bool
+	err := m.db.QueryRow(ctx, query, msg.Content, msg.UserId).Scan(&exists)
+	if err != nil {
+		return false, fmt.Errorf("checking if message exists: %w", err)
+	} else {
+		return exists, nil
+	}
+}