added db_insert_user

src/db_insert_user.c

@@ -0,0 +1,56 @@
+#include "database.h"
+#include "sql.h"
+#include "user.h"
+
+User *db_insert_user(const char *username, const char *email,
+                     const char *password, const char *group,
+                     bool *is_superuser) {
+  pthread_mutex_lock(&db_mutex);
+  if (!db) {
+    fprintf(stderr, "Databse not initialized\n");
+    return nullptr;
+  }
+  if (!username || !email || !password) {
+    fprintf(stderr, "username, email, password connot be empty\n");
+    return nullptr;
+  }
+  const char *sql = nullptr;
+  sqlite3_stmt *stmt;
+  int rc;
+  if (!group || !is_superuser) {
+    sql = INSERT_USER_USERNAME_EMAIL_PASSWORD_SQL;
+  } else if (!group) {
+    sql = INSERT_USER_USERNAME_EMAIL_PASSWORD_GROUP_SQL;
+  } else {
+    sql = INSERT_USER_FULL_SQL;
+  }
+  rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "Cannot prepare statement: %s\n", sqlite3_errmsg(db));
+    return nullptr;
+  }
+
+  sqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
+  sqlite3_bind_text(stmt, 2, email, -1, SQLITE_STATIC);
+  sqlite3_bind_text(stmt, 3, password, -1, SQLITE_STATIC);
+
+  if (group) {
+    sqlite3_bind_text(stmt, 4, group, -1, SQLITE_STATIC);
+  }
+  if (is_superuser) {
+    sqlite3_bind_int(stmt, 5, is_superuser);
+  }
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    fprintf(stderr, "Execution failed: %s\n", sqlite3_errmsg(db));
+    sqlite3_finalize(stmt);
+    return nullptr;
+  }
+
+  int inserted_id = sqlite3_last_insert_rowid(db);
+
+  sqlite3_finalize(stmt);
+  printf("User inserted successfully. ID: %d\n", inserted_id);
+  pthread_mutex_unlock(&db_mutex);
+}