added a method to login with email and password with was missing in t…

…he package

auth/email_action_links.go

@@ -136,3 +136,67 @@ func (c *baseClient) generateEmailActionLink(
 	_, err := c.post(ctx, "/accounts:sendOobCode", payload, &result)
 	return result.OOBLink, err
 }
+
+
+//LoginRequest represents the the request payload 
+type LoginRequest struct {
+	Email string `json:"email"`
+	Password string `json:"password"`
+	ReturnSecureToken bool `json:"returnSecureToken"`
+}
+
+//response 
+type LoginResponse struct {
+	IDToken string `json:"idToken"`
+	RefreshToken string `json:"refreshToken"`
+	ExpiresIn string `json:"expiresIn"`
+	Email string `json:"email"`
+}
+
+
+// LoginWithEmailAndPassword logs in a user using email and password with structured logging and detailed error handling.
+func (c *baseClient) LoginWithEmailAndPassword(ctx context.Context, email, password string) (*LoginResponse, error) {
+	if email == "" || password == "" {
+		return nil, errors.New("email and password must not be empty")
+	}
+
+	payload := LoginRequest{
+		Email:             email,
+		Password:          password,
+		ReturnSecureToken: true,
+	}
+
+	_, err := c.GetUserByEmail(ctx, email)
+	if err != nil {
+		return nil, fmt.Errorf("no account associated with this email")
+	}
+
+	b, err := json.Marshal(payload)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal payload: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", c.userManagementEndpoint+"/accounts:signInWithPassword", strings.NewReader(string(b)))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	res, err := c.httpClient.Client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("request to authentication service failed: %w", err)
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("invalid email or password: status code %d", res.StatusCode)
+	}
+
+	var result LoginResponse
+	if err := json.NewDecoder(res.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return &result, nil
+}