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import type { RowDescription } from "./connection.ts";import { encode, EncodedArg } from "./encode.ts";import { decode } from "./decode.ts";import { WarningFields } from "./warning.ts";
const commandTagRegexp = /^([A-Za-z]+)(?: (\d+))?(?: (\d+))?/;
type CommandType = (  | "INSERT"  | "DELETE"  | "UPDATE"  | "SELECT"  | "MOVE"  | "FETCH"  | "COPY");
export interface QueryConfig {  text: string;  args?: Array<unknown>;  name?: string;  encoder?: (arg: unknown) => EncodedArg;}
export interface QueryObjectConfig extends QueryConfig {  /**   * This parameter superseeds query column names   *    * When specified, this names will be asigned to the results   * of the query in the order they were provided   *    * Fields must be unique (case is not taken into consideration)   */  fields?: string[];}
export class QueryResult {  // TODO  // This should be private for real  public _done = false;  public command!: CommandType;  public rowCount?: number;  public rowDescription?: RowDescription;  public warnings: WarningFields[] = [];
  constructor(public query: Query) {}
  /**   * This function is required to parse each column   * of the results   */  loadColumnDescriptions(description: RowDescription) {    this.rowDescription = description;  }
  handleCommandComplete(commandTag: string): void {    const match = commandTagRegexp.exec(commandTag);    if (match) {      this.command = match[1] as CommandType;      if (match[3]) {        // COMMAND OID ROWS        this.rowCount = parseInt(match[3], 10);      } else {        // COMMAND ROWS        this.rowCount = parseInt(match[2], 10);      }    }  }
  insertRow(_row: Uint8Array[]): void {    throw new Error("No implementation for insertRow is defined");  }
  done() {    this._done = true;  }}
export class QueryArrayResult<T extends Array<unknown>> extends QueryResult {  public rows: T[] = [];
  // deno-lint-ignore camelcase  insertRow(row_data: Uint8Array[]) {    if (this._done) {      throw new Error(        "Tried to add a new row to the result after the result is done reading",      );    }
    if (!this.rowDescription) {      throw new Error(        "The row descriptions required to parse the result data weren't initialized",      );    }
    // Row description won't be modified after initialization    const row = row_data.map((raw_value, index) => {      const column = this.rowDescription!.columns[index];
      if (raw_value === null) {        return null;      }      return decode(raw_value, column);    }) as T;
    this.rows.push(row);  }}
export class QueryObjectResult<T extends Record<string, unknown>>  extends QueryResult {  public rows: T[] = [];
  // deno-lint-ignore camelcase  insertRow(row_data: Uint8Array[]) {    if (this._done) {      throw new Error(        "Tried to add a new row to the result after the result is done reading",      );    }
    if (!this.rowDescription) {      throw new Error(        "The row descriptions required to parse the result data weren't initialized",      );    }
    if (      this.query.fields &&      this.rowDescription.columns.length !== this.query.fields.length    ) {      throw new RangeError(        "The fields provided for the query don't match the ones returned as a result " +          `(${this.rowDescription.columns.length} expected, ${this.query.fields.length} received)`,      );    }
    // Row description won't be modified after initialization    const row = row_data.reduce((row, raw_value, index) => {      const column = this.rowDescription!.columns[index];
      // Find the field name provided by the user      // default to database provided name      const name = this.query.fields?.[index] ?? column.name;
      if (raw_value === null) {        row[name] = null;      } else {        row[name] = decode(raw_value, column);      }
      return row;    }, {} as Record<string, unknown>) as T;
    this.rows.push(row);  }}
export class Query {  public text: string;  public args: EncodedArg[];  public fields?: string[];
  constructor(config: QueryObjectConfig);  constructor(text: string, ...args: unknown[]);  //deno-lint-ignore camelcase  constructor(config_or_text: string | QueryObjectConfig, ...args: unknown[]) {    let config: QueryConfig;    if (typeof config_or_text === "string") {      config = { text: config_or_text, args };    } else {      const {        fields,        //deno-lint-ignore camelcase        ...query_config      } = config_or_text;
      config = query_config;
      if (fields) {        //deno-lint-ignore camelcase        const clean_fields = fields.map((field) =>          field.toString().toLowerCase()        );
        if ((new Set(clean_fields)).size !== clean_fields.length) {          throw new TypeError(            "The fields provided for the query must be unique",          );        }
        this.fields = clean_fields;      }    }    this.text = config.text;    this.args = this._prepareArgs(config);  }
  private _prepareArgs(config: QueryConfig): EncodedArg[] {    const encodingFn = config.encoder ? config.encoder : encode;    return (config.args || []).map(encodingFn);  }}