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// Copyright 2020-2021 the denosaurs team. All rights reserved. MIT license.
import {  buildFlags,  Script,  ScriptObject,  ScriptOptions,  Scripts,} from "./scripts.ts";
import { merge } from "./merge.ts";
/** `Runner` configuration. * This configuration is, in contrast to other, extended * by `Denon` config as scripts has to be a top level * parameter. */export interface RunnerConfig extends ScriptOptions {  scripts: Scripts;}
const reDenoAction = new RegExp(/^(deno +\w+) *(.*)$/);const reCompact = new RegExp(  /^'(?:\\'|.)*?\.(ts|js)'|^"(?:\\"|.)*?\.(ts|js)"|^(?:\\ |\S)+\.(ts|js)$/,);const reCliCompact = new RegExp(/^(run|test|fmt|lint) *(.*)$/);
/** Handle all the things related to process management. * Scripts are built into executable commands that are * executed by `Deno.run()` and managed in an `Executable` * object to make available process events. */export class Runner {  #config: RunnerConfig;  #args: string[];
  constructor(config: RunnerConfig, args: string[] = []) {    this.#config = config;    this.#args = args;  }
  private cmd(cmd: string[], options: ScriptOptions): Command {    const command = {      cmd,      options,      exe: (): Deno.Process => {        return this.execute(command);      },    };    return command;  }
  private buildCliCommand(args: string[], global: ScriptOptions): Command {    const cmd = args.join(" ");    let out: string[];    if (reCompact.test(cmd)) {      out = ["deno", "run"];      out = out.concat(stdCmd(cmd));    } else if (reCliCompact.test(cmd)) {      out = ["deno"];      out = out.concat(stdCmd(cmd));    } else {      out = stdCmd(cmd);    }    return this.cmd(out, global); // single command  }
  private buildCommands(    script: string | ScriptObject,    global: ScriptOptions,    args: string[],  ): Command[] {    if (typeof script === "object") {      const options = Object.assign({}, merge(global, script));      return this.buildStringCommands(script.cmd, options, args);    }
    return this.buildStringCommands(script, global, args);  }
  public buildStringCommands(    script: string,    global: ScriptOptions,    args: string[],  ): Command[] {    if (script.includes("&&")) {      const commands: Command[] = [];      script.split("&&").map((s) => {        commands.push(this.buildCommand(s, global, args));      });      return commands;    }
    return [this.buildCommand(script, global, args)];  }
  private buildCommand(    cmd: string,    options: ScriptOptions,    cli: string[],  ): Command {    let out: string[] = [];    cmd = stdCmd(cmd).join(" ");    const denoAction = reDenoAction.exec(cmd);    if (denoAction && denoAction.length === 3) {      const action = denoAction[1];      const args = denoAction[2];      out = out.concat(stdCmd(action));      out = out.concat(buildFlags(options));      if (args) out = out.concat(stdCmd(args));    } else if (reCompact.test(cmd)) {      out = ["deno", "run"];      out = out.concat(buildFlags(options));      out = out.concat(stdCmd(cmd));    } else {      out = stdCmd(cmd);    }
    if (cli) out = out.concat(cli);    return this.cmd(out, options); // single command  }
  /** Build the script, in whatever form it is declared in,   * to be compatible with `Deno.run()`.   * This function add flags, arguments and actions. */  build(script: string): Command[] {    // global options    const g = Object.assign(      {        watch: true, // this is a file watcher after all :)      },      this.#config,    );    g.scripts = {};
    const s: Script = this.#config.scripts[script];
    if (!s) {      if (this.#args.length > 0) {        return [this.buildCliCommand(this.#args, g)];      } else {        throw new Error("Script does not exist and CLI args are not provided.");      }    }
    const args = this.#args.slice(1);
    let commands: Command[] = [];
    if (Array.isArray(s)) {      s.forEach((ss) => {        commands = commands.concat(this.buildCommands(ss, g, args));      });    } else {      commands = commands.concat(this.buildCommands(s, g, args));    }
    return commands;  }
  /** Create an `Execution` object to handle the lifetime   * of the process that is executed. */  execute(command: Command): Deno.Process {    const options = {      cmd: command.cmd,      env: command.options.env ?? {},      stdin: command.options.stdin ?? "inherit",      stdout: command.options.stdout ?? "inherit",      stderr: command.options.stderr ?? "inherit",    };    return Deno.run(options);  }}
function stdCmd(cmd: string): string[] {  return cmd.trim().replace(/\s\s+/g, " ").split(" ");}
export interface Command {  cmd: string[];  options: ScriptOptions;  exe: () => Deno.Process;}