'use strict'

module.exports = statistics

// Get stats for a file, list of files, or list of messages.
function statistics(files) {
  var result = {true: 0, false: 0, null: 0}

  count(files)

  return {
    fatal: result.true,
    nonfatal: result.false + result.null,
    warn: result.false,
    info: result.null,
    total: result.true + result.false + result.null
  }

  function count(value) {
    if (value) {
      if (value[0] && value[0].messages) {
        // Multiple vfiles
        countInAll(value)
      } else {
        // One vfile / messages
        countAll(value.messages || value)
      }
    }
  }

  function countInAll(files) {
    var length = files.length
    var index = -1

    while (++index < length) {
      count(files[index].messages)
    }
  }

  function countAll(messages) {
    var length = messages.length
    var index = -1
    var fatal

    while (++index < length) {
      fatal = messages[index].fatal
      result[fatal === null || fatal === undefined ? null : Boolean(fatal)]++
    }
  }
}