added delete contact route

database/auth.go

@@ -52,6 +52,9 @@ func InsertUser(db *sql.DB, username string, passwordHash string) (string, error
 	if err != nil {
 		return "", fmt.Errorf("error inserting user: %v", err)
 	}
+
+	log.Printf("Inserted user: %v", username)
+
 	return userId, err
 }
 
@@ -64,8 +67,8 @@ func GetPasswordHash(db *sql.DB, username string) (string, error) {
 	var passwordHash string
 	err := db.QueryRow(query, username).Scan(&passwordHash)
 	if err != nil {
-		fmt.Printf("error getting password: %v\n", err)
-		return "", fmt.Errorf("error getting password: %v", err)
+		fmt.Printf("error getting password hash: %v\n", err)
+		return "", fmt.Errorf("error getting password hash: %v", err)
 	}
 
 	return passwordHash, err

database/contacts.go

@@ -0,0 +1,88 @@
+package database
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"github.com/google/uuid"
+	"log"
+)
+
+func DeleteContact(db *sql.DB, userID uuid.UUID, conversationID uuid.UUID) (string, error) {
+	// Check conversation type
+	var conversationType string
+	err := db.QueryRow(
+		"SELECT conversation_type FROM Conversations WHERE conversation_id = $1",
+		conversationID,
+	).Scan(&conversationType)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return "no conversation found for this id", nil
+		}
+		return "", fmt.Errorf("error checking conversation type: %w", err)
+	}
+
+	if conversationType == "group" {
+		// Delete from Contacts
+		res, err := db.Exec(
+			"DELETE FROM Contacts WHERE conversation_id = $1 AND user_id = $2",
+			conversationID,
+			userID,
+		)
+		if err != nil {
+			return "", fmt.Errorf("error deleting contact: %w", err)
+		}
+
+		rowsAffected, err := res.RowsAffected()
+		if err != nil {
+			return "", fmt.Errorf("error checking contact deletion: %w", err)
+		}
+		if rowsAffected == 0 {
+			return fmt.Sprintf("no matching contact found with conversation id: %s, user id: %s", conversationID, userID), nil
+		}
+
+		// Delete from Memberships
+		res, err = db.Exec(
+			"DELETE FROM Memberships WHERE conversation_id = $1 AND user_id = $2",
+			conversationID,
+			userID,
+		)
+		if err != nil {
+			return "", fmt.Errorf("error deleting membership: %w", err)
+		}
+
+		rowsAffected, err = res.RowsAffected()
+		if err != nil {
+			return "", fmt.Errorf("error checking membership deletion: %w", err)
+		}
+		if rowsAffected == 0 {
+			return "", fmt.Errorf("no matching membership found with conversation id: %s, user id: %s", conversationID, userID)
+		}
+
+		log.Printf("Successfully removed user %s from group %s", userID, conversationID)
+	} else {
+		// Handle direct conversation
+		res, err := db.Exec(
+			"DELETE FROM Contacts WHERE user_id = $1 AND conversation_id = $2",
+			userID,
+			conversationID,
+		)
+		if err != nil {
+			log.Printf("Error deleting contact: %v", err)
+			return "", fmt.Errorf("error deleting contact: %w", err)
+		}
+
+		rowsAffected, err := res.RowsAffected()
+		if err != nil {
+			log.Printf("Error checking contact deletion: %v", err)
+			return "", fmt.Errorf("error checking contact deletion: %w", err)
+		}
+		if rowsAffected == 0 {
+			return fmt.Sprintf("no matching contact found with user id: %s, conversation id: %s", userID, conversationID), nil
+		}
+
+		log.Printf("Successfully deleted contact for user %s in conversation %s", userID, conversationID)
+	}
+
+	return "", nil
+}