var ssbRef = require('ssb-ref')
var mlib = require('ssb-msgs')

exports.new = function (project, title, text) {
  if (!ssbRef.isLink(project))
    throw new Error('invalid project id')
  var msg = { type: 'issue', project: project }
  if (text == null) {
    text = title
    title = null
  }
  if (title) {
    if (typeof title === 'string')
      msg.title = title
    else
      throw new Error('invalid issue title')
  }
  if (text) {
    if (typeof text === 'string')
      msg.text = text
    else
      throw new Error('invalid issue text')
  }
  return msg
}

exports.newLabel = function (project, name, issues) {
  if (!ssbRef.isLink(project))
    throw new Error('invalid project id')

  var msg = { type: 'issue-label', project: project }
  if (name) {
    if (typeof name === 'string')
      msg.name = name
    else
      throw new Error('invalid issue label name')
  }
  if (issues) {
    if (Array.isArray(issues) && issues.every(ssbRef.isMsg))
      msg.issues = issues
    else
      throw new Error('invalid issues list')
  }
  return msg
}

exports.edit = function (id, opts) {
  if (!ssbRef.isMsg(id))
    throw new Error('invalid issue id')
  var msg = {
    type: 'issue-edit',
    issues: [{
      link: id
    }]
  }
  var labels = {}
  if (opts.open != null)
    msg.issues[0].open = opts.open
  if (opts.title != null)
    msg.issues[0].title = opts.title
  if (opts.addLabels != null) {
    if (Array.isArray(opts.addLabels) && opts.addLabels.every(ssbRef.isMsg)) {
      msg.issues[0].labels = labels
      labels.add = opts.addLabels
    } else {
      throw new Error('invalid addLabels')
    }
  }
  if (opts.removeLabels != null) {
    if (Array.isArray(opts.removeLabels)
     && opts.removeLabels.every(ssbRef.isMsg)) {
      msg.issues[0].labels = labels
      labels.remove = opts.removeLabels
    } else {
      throw new Error('invalid removeLabels')
    }
  }
  return msg
}

exports.close = function (id) {
  return exports.edit(id, {open: false})
}

exports.reopen = function (id) {
  return exports.edit(id, {open: true})
}

function editMsg(msg, id, open) {
  if (!ssbRef.isMsg(id))
    throw new Error('invalid issue id')
  ;(msg.issues || (msg.issues = [])).push({
    link: id,
    open: open
  })
  return msg
}

exports.reopens = function (msg, id) {
  return editMsg(msg, id, true)
}

exports.closes = function (msg, id) {
  return editMsg(msg, id, false)
}