#!/usr/bin/env node
var fs = require('fs')
var path = require('path')
var root = path.resolve(__dirname, '..')
var glob = require('glob')
var conversion = { 'cli': 1, 'api': 3, 'files': 5, 'misc': 7 }

glob(root + '/{README.md,doc/*/*.md}', function (er, files) {
  if (er) throw er

  output(files.map(function (f) {
    var b = path.basename(f)
    if (b === 'README.md') return [0, b]
    if (b === 'index.md') return null
    var s = conversion[path.basename(path.dirname(f))]
    return [s, f]
  }).filter(function (f) {
    return f
  }).sort(function (a, b) {
    return (a[0] === b[0])
            ? (path.basename(a[1]) === 'npm.md' ? -1
            : path.basename(b[1]) === 'npm.md' ? 1
            : a[1] > b[1] ? 1 : -1)
            : a[0] - b[0]
  }))
})

function output (files) {
  console.log(
    'npm-index(7) -- Index of all npm documentation\n' +
    '==============================================\n')

  writeLines(files, 0)
  writeLines(files, 1, 'Command Line Documentation', 'Using npm on the command line')
  writeLines(files, 3, 'API Documentation', 'Using npm in your Node programs')
  writeLines(files, 5, 'Files', 'File system structures npm uses')
  writeLines(files, 7, 'Misc', 'Various other bits and bobs')
}

function writeLines (files, sxn, heading, desc) {
  if (heading) {
    console.log('## %s\n\n%s\n', heading, desc)
  }
  files.filter(function (f) {
    return f[0] === sxn
  }).forEach(writeLine)
}

function writeLine (sd) {
  var sxn = sd[0] || 1
  var doc = sd[1]
  var d = path.basename(doc, '.md')

  var content = fs.readFileSync(doc, 'utf8').split('\n')[0].split('-- ')[1]

  console.log('### %s(%d)\n', d, sxn)
  console.log(content + '\n')
}