import * as childProcess from "child_process";
import * as fs from "fs";
import * as path from "path";

export function exists(filePath: string): boolean {
  try {
    return fs.existsSync(filePath);
  } catch (ignore) {
    return false;
  }
}

export function readFile(filePath: string): string {
  const _filePath = resolveFilePath(filePath);
  return fs.readFileSync(_filePath, "utf8");
}

export const resolveFilePath = (filePath: string): string => {
  if (filePath.length === 0) {
    return filePath;
  }
  if (filePath[0] === "~") {
    return path.join(process.env.HOME!, filePath.slice(1));
  }
  return filePath;
}

export function readStdin(): Promise<string> {
  return new Promise<string>((resolve): void => {
    let content = "";
    process.stdin.resume();
    process.stdin.on("data", (buf) => {
      content += buf.toString("utf8");
    });
    process.stdin.on("end", () => resolve(content));
  });
}

export function writeFile(filePath: string, content: string): void {
  return fs.writeFileSync(filePath, content);
}

export function appendFileSync(filePath: string, content: string): void {
  return fs.appendFileSync(filePath, content);
}

export function execute(cmd: string): string {
  return childProcess.execSync(cmd).toString("utf8");
}

export function removeFile(filePath: string): void {
  if (fs.existsSync(filePath)) {
    return fs.unlinkSync(filePath);
  }
}