#!/usr/bin/env node

var Mdx = require('../index')
var Extractor = Mdx.Extractor

if (!process.parent) run()

/**
 * Runs.
 */

function run () {
  var read = require('read-input')
  var cli = getcli()

  var ex = new Extractor({
    excludeTags: cli.flags.excludeTag
  })

  read(cli.input).then(function (res) {
    // non-fatal errors
    if (res.error) console.warn(res.error.message)

    res.files.forEach(function (f) {
      ex.push(f.name, f.data)
    })

    var output = ex.toJson()

    if (cli.flags.format === 'json') {
      console.log(JSON.stringify(output, null, 2))

    } else if (cli.flags.format === 'markdown') {
      output = Mdx.renderTemplate(output)
      process.stdout.write(output)

    } else {
      console.error('unknown format: ' + cli.flags.format)
    }

  }).catch(function (err) {
    console.error(err.stack)
    process.exit(1)
  })
}

function getcli () {
  var cli = require('meow')(`
    Usage: mdx [options] [files...]

    Options:
      -f, --format FMT        set output format {json, markdown}
      -m, --markdown          short for --format=markdown
          --json              short for --format=json
      -x, --exclude-tag TAG   excludes certain tag (can be repeated)

    Other options:
      -h, --help              show usage information
      -v, --version           print version info and exit

    Examples:
      mdx lib/*.js
      cat lib/*.js | mdx -x internal -f markdown
  `, {
    alias: {
      h: 'help', v: 'version', f: 'format', x: 'exclude-tag',
      m: 'markdown'
    },
    boolean: ['markdown', 'json'],
    string: ['exclude-tag', 'format'],
    default: { format: 'json' },
    '--': true
  })

  if (cli.flags.markdown) cli.flags.format = 'markdown'
  if (cli.flags.json) cli.flags.format = 'json'

  if (!cli.flags.excludeTag) {
    cli.flags.excludeTag = []
  } else if (!Array.isArray(cli.flags.excludeTag)) {
    cli.flags.excludeTag = [cli.flags.excludeTag]
  }

  return cli
}