import * as fs from "fs";
import { watch, dest, src, series } from "gulp";
import * as nodemon from "gulp-nodemon";
import * as ts from "gulp-typescript";
import * as rename from "gulp-rename";

const jest = require("gulp-jest").default;

const tsProject = ts.createProject("tsconfig.json");

export function test() {
  // Unlike the jest CLI tool, gulp-jest does not automatically set process.env.NODE_ENV to be test
  process.env.NODE_ENV = "test";

  if (!fs.existsSync("src/test/.env.test")) {
    src(".env.example")
      .pipe(rename(".env.test"))
      .pipe(dest("src/test"));
  }

  return src("src/test").pipe(
    jest({
      detectOpenHandles: true,
      coverage: true
    })
  );
}

function createConf(cb: any) {
  if (!fs.existsSync("dist/.env")) {
    return src(".env.example")
      .pipe(rename(".env"))
      .pipe(dest("dist"));
  }
  cb();
}

function copyDocs() {
  return src("src/docs/**/*.yml").pipe(dest("dist/docs"));
}

function transpile() {
  process.env.NODE_ENV = "dev";
  return src(["src/**/*.ts", "!src/**/*.test.ts"])
    .pipe(tsProject())
    .pipe(dest("dist"));
}

function livereload(cb: any) {
  process.env.NODE_ENV = "dev";
  nodemon({ script: "dist/index.js", ext: "js, yml", delay: 1000, done: cb });
  watch(["src/**/*.ts", "!**/*.test.ts"], transpile);
  watch("src/**/*.test.ts", test);
  watch("src/docs/**/*.yml", copyDocs);
}

export default series(createConf, transpile, copyDocs, livereload);

export const dev = series(createConf, transpile, copyDocs, livereload);
export const build = series(test, transpile, createConf, copyDocs);