// tasks.ts

// write tasks file once, publish it and then reuse or even extend
// in all projects using `start.preset` option in `package.json`,
// something like `my-start-preset` package with everything included

import sequence from '@start/plugin-sequence'
import parallel from '@start/plugin-parallel'
import xargs from '@start/plugin-xargs'
import find from '@start/plugin-find'
import findGitStaged from '@start/plugin-find-git-staged'
import remove from '@start/plugin-remove'
import read from '@start/plugin-read'
import rename from '@start/plugin-rename'
import write from '@start/plugin-write'
import babel from '@start/plugin-lib-babel'
import typescriptGenerate from '@start/plugin-lib-typescript-generate'
import eslint from '@start/plugin-lib-eslint'
import {
  istanbulInstrument,
  istanbulReport,
  istanbulThresholds
} from '@start/plugin-lib-istanbul'
import tape from '@start/plugin-lib-tape'
import codecov from '@start/plugin-lib-codecov'

const babelConfig = {
  babelrc: false,
  presets: [
    [
      '@babel/preset-env',
      {
        targets: {
          node: 6
        },
        modules: false
      }
    ],
    '@babel/preset-typescript'
  ]
}

// each named export is a "task"
export const build = (packageName: string) =>
  sequence(
    find(`packages/${packageName}/src/**/*.ts`),
    read,
    babel(babelConfig),
    rename((file) => file.replace(/\.ts$/, '.js')),
    write(`packages/${packageName}/build/`)
  )

export const dts = (packageName: string) =>
  sequence(
    find(`packages/${packageName}/src/index.ts`),
    typescriptGenerate(`packages/${packageName}/build/`)
  )

export const pack = (packageName: string) =>
  sequence(
    find(`packages/${packageName}/build/`),
    remove,
    // child-processes
    parallel(['build', 'dts'])(packageName)
  )

// child processes
export const packs = xargs('pack')

export const dev = (packageName: string) =>
  watch(`packages/${packageName}/**/*.ts`)(
    build(packageName)
  )

export const lint = () =>
  sequence(
    findGitStaged(['packages/*/{src,test}/**/*.ts']),
    read,
    eslint()
  )

export const lintAll = () =>
  sequence(
    find(['packages/*/{src,test}/**/*.ts']),
    read,
    eslint()
  )

export const test = () =>
  sequence(
    find('coverage/'),
    remove,
    find('packages/*/src/**/*.ts'),
    istanbulInstrument({ esModules: true, extensions: ['.ts'] }),
    find('packages/*/test/**/*.ts'),
    tape(),
    istanbulReport(['lcovonly', 'html', 'text-summary']),
    istanbulThresholds({ functions: 100 })
  )

export const ci = () =>
  sequence(
    // nested task
    lintAll(),
    // nested task
    test(),
    find('coverage/lcov.info'),
    read,
    codecov
  )