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import { RowDescription, Column, Format } from "./connection.ts";import { Connection } from "./connection.ts";import { encode, EncodedArg } from "./encode.ts";
import { decode } from "./decode.ts";
export interface QueryConfig {  text: string;  args?: Array<unknown>;  name?: string;  encoder?: (arg: unknown) => EncodedArg;}
export class QueryResult {  public rowDescription!: RowDescription;  private _done = false;  public rows: any[] = []; // actual results
  constructor(public query: Query) {}
  handleRowDescription(description: RowDescription) {    this.rowDescription = description;  }
  private _parseDataRow(dataRow: any[]): any[] {    const parsedRow = [];
    for (let i = 0, len = dataRow.length; i < len; i++) {      const column = this.rowDescription.columns[i];      const rawValue = dataRow[i];
      if (rawValue === null) {        parsedRow.push(null);      } else {        parsedRow.push(decode(rawValue, column));      }    }
    return parsedRow;  }
  handleDataRow(dataRow: any[]): void {    if (this._done) {      throw new Error("New data row, after result if done.");    }
    const parsedRow = this._parseDataRow(dataRow);    this.rows.push(parsedRow);  }
  rowsOfObjects() {    return this.rows.map((row) => {      const rv: { [key: string]: any } = {};      this.rowDescription.columns.forEach((column, index) => {        rv[column.name] = row[index];      });
      return rv;    });  }
  done() {    this._done = true;  }}
export class Query {  public text: string;  public args: EncodedArg[];  public result: QueryResult;
  // TODO: can we use more specific type for args?  constructor(text: string | QueryConfig, ...args: unknown[]) {    let config: QueryConfig;    if (typeof text === "string") {      config = { text, args };    } else {      config = text;    }    this.text = config.text;    this.args = this._prepareArgs(config);    this.result = new QueryResult(this);  }
  private _prepareArgs(config: QueryConfig): EncodedArg[] {    const encodingFn = config.encoder ? config.encoder : encode;    return config.args!.map(encodingFn);  }}