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import { parseDsn } from "./utils.ts";
const DEFAULT_CONNECTION_PARAMS = {  host: "127.0.0.1",  port: "5432",  user: "postgres",  database: "postgres",  password: "",  application_name: "deno_postgres"};
export interface IConnectionParams {  database?: string;  host?: string;  port?: string;  user?: string;  password?: string;  application_name?: string;}
export class ConnectionParams {  database?: string;  host?: string;  port?: string;  user?: string;  password?: string;  application_name?: string;  // TODO: support other params
  constructor(config?: string | IConnectionParams) {    // TODO: I don't really like that we require access to environment    //  by default, maybe it should be flag-controlled?    const envVars = Deno.env();
    if (!config) {      config = {};    }
    if (typeof config === "string") {      const dsn = parseDsn(config);      if (dsn.driver !== "postgres") {        throw new Error(`Supplied DSN has invalid driver: ${dsn.driver}.`);      }
      this.database = dsn.database || envVars.PGDATABASE;      this.host = dsn.host || envVars.PGHOST;      this.port = dsn.port || envVars.PGPORT;      this.user = dsn.user || envVars.PGUSER;      this.password = dsn.password || envVars.PGPASSWORD;      this.application_name = dsn.params.application_name || envVars.PGAPPNAME;    } else {      this.database = config.database || envVars.PGDATABASE;      this.host = config.host || envVars.PGHOST;      this.port = config.port || envVars.PGPORT;      this.user = config.user || envVars.PGUSER;      this.password = config.password || envVars.PGPASSWORD;      this.application_name = config.application_name || envVars.PGAPPNAME;    }  }}