import chalk from 'chalk'
import { indent, foldLines, colorize } from './utils/formatting'
import { startSpaces, optionSpaces } from './utils/constants'
import getCommand from './commands'

export default async function listCommands () {
  const commandsOrder = ['dev', 'build', 'generate', 'start', 'help']

  // Load all commands
  const _commands = await Promise.all(
    commandsOrder.map(cmd => getCommand(cmd))
  )

  let maxLength = 0
  const commandsHelp = []

  for (const command of _commands) {
    commandsHelp.push([command.usage, command.description])
    maxLength = Math.max(maxLength, command.usage.length)
  }

  const _cmds = commandsHelp.map(([cmd, description]) => {
    const i = indent(maxLength + optionSpaces - cmd.length)
    return foldLines(
      chalk.green(cmd) + i + description,
      startSpaces + maxLength + optionSpaces * 2,
      startSpaces + optionSpaces
    )
  }).join('\n')

  const usage = foldLines('Usage: nuxt <command> [--help|-h]', startSpaces)
  const cmds = foldLines('Commands:', startSpaces) + '\n\n' + _cmds

  process.stderr.write(colorize(`${usage}\n\n${cmds}\n\n`))
}