import { mkdirSync } from "node:fs";
import { dirname } from "node:path";
import { DatabaseSync } from "node:sqlite";
import { installSchema } from "./schema";

export class DatabaseConnection {
  readonly db: DatabaseSync;

  constructor(dbPath: string) {
    mkdirSync(dirname(dbPath), { recursive: true });
    this.db = new DatabaseSync(dbPath);
    this.db.exec("pragma journal_mode = WAL");
    this.db.exec("pragma foreign_keys = ON");
    installSchema(this.db);
  }

  transaction<T>(operation: () => T): T {
    this.db.exec("begin immediate");
    try {
      const result = operation();
      this.db.exec("commit");
      return result;
    } catch (error) {
      this.db.exec("rollback");
      throw error;
    }
  }

  close(): void {
    this.db.close();
  }
}

export function withSavepoint<T>(db: DatabaseSync, name: string, operation: () => T): T {
  db.exec(`savepoint ${name}`);
  try {
    const result = operation();
    db.exec(`release savepoint ${name}`);
    return result;
  } catch (error) {
    db.exec(`rollback to savepoint ${name}`);
    db.exec(`release savepoint ${name}`);
    throw error;
  }
}