// Common code for a discussion are a of messages about something

//

var UI = {

authn: require('./signin'),

icons: require('./iconBase'),

log: require('./log'),

ns: require('./ns'),

pad: require('./'),

rdf: require('rdflib'),

store: require('./store'),

style: require('./style'),

widgets: require('./widgets')

}

const utils = require('./utils')

// var buttonStyle = 'font-size: 100%; margin: 0.8em; padding:0.5em; background-color: white;'

module.exports = function (dom, kb, subject, messageStore, options) {

kb = kb || UI.store

messageStore = messageStore.doc() // No hash

var ns = UI.ns

var WF = $rdf.Namespace('http://www.w3.org/2005/01/wf/flow#')

var DCT = $rdf.Namespace('http://purl.org/dc/terms/')

options = options || {}

var newestFirst = !!options.newestFirst

var messageBodyStyle = 'white-space: pre-wrap; width: 90%; font-size:100%; border: 0.07em solid #eee; padding: .2em 0.5em; margin: 0.1em 1em 0.1em 1em;'

// 'font-size: 100%; margin: 0.1em 1em 0.1em 1em; background-color: white; white-space: pre-wrap; padding: 0.1em;'

var div = dom.createElement('div')

var messageTable // Shared by initial build and addMessageFromBindings

var me

var updater = UI.store.updater

var anchor = function (text, term) { // If there is no link return an element anyway

var a = dom.createElement('a')

if (term && term.uri) {

a.setAttribute('href', term.uri)

a.addEventListener('click', UI.widgets.openHrefInOutlineMode, true)

a.setAttribute('style', 'color: #3B5998; text-decoration: none; ') // font-weight: bold

}

a.textContent = text

return a

}

var mention = function mention (message, style) {

var pre = dom.createElement('pre')

pre.setAttribute('style', style || 'color: grey')

div.appendChild(pre)

pre.appendChild(dom.createTextNode(message))

return pre

}

var announce = {

log: function (message) { mention(message, 'color: #111;') },

warn: function (message) { mention(message, 'color: #880;') },

error: function (message) { mention(message, 'color: #800;') }

}

// Form for a new message

//

var newMessageForm = function () {

var form = dom.createElement('tr')

var lhs = dom.createElement('td')

var middle = dom.createElement('td')

var rhs = dom.createElement('td')

form.appendChild(lhs)

form.appendChild(middle)

form.appendChild(rhs)

form.AJAR_date = '9999-01-01T00:00:00Z' // ISO format for field sort

var sendMessage = function () {

// titlefield.setAttribute('class','pendingedit')

// titlefield.disabled = true

field.setAttribute('class', 'pendingedit')

field.disabled = true

var sts = []

var now = new Date()

var timestamp = '' + now.getTime()

var dateStamp = $rdf.term(now)

// http://www.w3schools.com/jsref/jsref_obj_date.asp

var message = kb.sym(messageStore.uri + '#' + 'Msg' + timestamp)

sts.push(new $rdf.Statement(subject, ns.wf('message'), message, messageStore))

// sts.push(new $rdf.Statement(message, ns.dc('title'), kb.literal(titlefield.value), messageStore))

sts.push(new $rdf.Statement(message, ns.sioc('content'), kb.literal(field.value), messageStore))

sts.push(new $rdf.Statement(message, DCT('created'), dateStamp, messageStore))

if (me) sts.push(new $rdf.Statement(message, ns.foaf('maker'), me, messageStore))

var sendComplete = function (uri, success, body) {

if (!success) {

form.appendChild(UI.widgets.errorMessageBlock(

dom, 'Error writing message: ' + body))

} else {

var bindings = { '?msg': message,

'?content': kb.literal(field.value),

'?date': dateStamp,

'?creator': me}

renderMessage(bindings, false) // not green

field.value = '' // clear from out for reuse

field.setAttribute('class', '')

field.disabled = false

}

}

updater.update([], sts, sendComplete)

}

form.appendChild(dom.createElement('br'))

var field, sendButton

var turnOnInput = function () {

creatorAndDate(lhs, me, '', null)

field = dom.createElement('textarea')

middle.innerHTML = ''

middle.appendChild(field)

field.rows = 3

// field.cols = 40

field.setAttribute('style', messageBodyStyle + 'background-color: #eef;')

field.addEventListener('keyup', function (e) { // User preference?

if (e.keyCode === 13) {

if (!e.altKey) { // Alt-Enter just adds a new line

sendMessage()

}

}

}, false)

rhs.innerHTML = ''

sendButton = UI.widgets.button(dom, UI.icons.iconBase + 'noun_383448.svg', 'Send')

sendButton.setAttribute('style', UI.style.buttonStyle + 'float: right;')

sendButton.addEventListener('click', sendMessage, false)

rhs.appendChild(sendButton)

}

let context = {div: middle, dom: dom}

UI.authn.logIn(context).then(context => {

me = context.me

turnOnInput()

})

return form

}

function nick (person) {

var s = UI.store.any(person, UI.ns.foaf('nick'))

if (s) return '' + s.value

return '' + utils.label(person)

}

function creatorAndDate (td1, creator, date, message) {

var nickAnchor = td1.appendChild(anchor(nick(creator), creator))

if (creator.uri) {

UI.store.fetcher.nowOrWhenFetched(creator.doc(), undefined, function (ok, body) {

nickAnchor.textContent = nick(creator)

})

}

td1.appendChild(dom.createElement('br'))

td1.appendChild(anchor(date, message))

}

// ///////////////////////////////////////////////////////////////////////

function syncMessages (about, messageTable) {

var displayed = {}

var ele, ele2

for (ele = messageTable.firstChild; ele; ele = ele.nextSibling) {

if (ele.AJAR_subject) {

displayed[ele.AJAR_subject.uri] = true

}

}

var messages = kb.each(about, ns.wf('message'))

var stored = {}

messages.map(function (m) {

stored[m.uri] = true

if (!displayed[m.uri]) {

addMessage(m)

}

})

for (ele = messageTable.firstChild; ele;) {

ele2 = ele.nextSibling

if (ele.AJAR_subject && !stored[ele.AJAR_subject.uri]) {

messageTable.removeChild(ele)

}

ele = ele2

}

}

var deleteMessage = function (message) {

var deletions = kb.statementsMatching(message).concat(

kb.statementsMatching(undefined, undefined, message))

updater.update(deletions, [], function (uri, ok, body) {

if (!ok) {

announce.error('Cant delete messages:' + body)

} else {

syncMessages(subject, messageTable)

}

})

}

var addMessage = function (message) {

var bindings = {

'?msg': message,

'?creator': kb.any(message, ns.foaf('maker')),

'?date': kb.any(message, DCT('created')),

'?content': kb.any(message, ns.sioc('content'))

}

renderMessage(bindings, true) // fresh from elsewhere

}

var renderMessage = function (bindings, fresh) {

var creator = bindings['?creator']

var message = bindings['?msg']

var date = bindings['?date']

var content = bindings['?content']

var dateString = date.value

var tr = dom.createElement('tr')

tr.AJAR_date = dateString

tr.AJAR_subject = message

var done = false

for (var ele = messageTable.firstChild; ; ele = ele.nextSibling) {

if (!ele) { // empty

break

}

if (((dateString > ele.AJAR_date) && newestFirst) ||

((dateString < ele.AJAR_date) && !newestFirst)) {

messageTable.insertBefore(tr, ele)

done = true

break

}

}

if (!done) {

messageTable.appendChild(tr)

}

var td1 = dom.createElement('td')

tr.appendChild(td1)

creatorAndDate(td1, creator, UI.widgets.shortDate(dateString), message)

var td2 = dom.createElement('td')

tr.appendChild(td2)

var pre = dom.createElement('p')

pre.setAttribute('style', messageBodyStyle +

(fresh ? 'background-color: #e8ffe8;' : 'background-color: #white;'))

td2.appendChild(pre)

pre.textContent = content.value

var td3 = dom.createElement('td')

tr.appendChild(td3)

var delButton = dom.createElement('button')

td3.appendChild(delButton)

delButton.textContent = '-'

tr.setAttribute('class', 'hoverControl') // See tabbedtab.css (sigh global CSS)

delButton.setAttribute('class', 'hoverControlHide')

delButton.setAttribute('style', 'color: red;')

delButton.addEventListener('click', function (e) {

td3.removeChild(delButton) // Ask -- are you sure?

var cancelButton = dom.createElement('button')

cancelButton.textContent = 'cancel'

td3.appendChild(cancelButton).addEventListener('click', function (e) {

td3.removeChild(sureButton)

td3.removeChild(cancelButton)

td3.appendChild(delButton)

}, false)

var sureButton = dom.createElement('button')

sureButton.textContent = 'Delete message'

td3.appendChild(sureButton).addEventListener('click', function (e) {

td3.removeChild(sureButton)

td3.removeChild(cancelButton)

deleteMessage(message)

}, false)

}, false)

}

// Messages with date, author etc

messageTable = dom.createElement('table')

messageTable.fresh = false

div.appendChild(messageTable)

messageTable.setAttribute('style', 'width: 100%;') // fill that div!

var tr = newMessageForm()

if (newestFirst) {

messageTable.insertBefore(tr, messageTable.firstChild) // If newestFirst

} else {

messageTable.appendChild(tr) // not newestFirst

}

var query

// Do this with a live query to pull in messages from web

if (options.query) {

query = options.query

} else {

query = new $rdf.Query('Messages')

var v = {} // semicolon needed

var vs = ['msg', 'date', 'creator', 'content']

vs.map(function (x) {

query.vars.push(v[x] = $rdf.variable(x))

})

query.pat.add(subject, WF('message'), v['msg'])

query.pat.add(v['msg'], ns.dct('created'), v['date'])

query.pat.add(v['msg'], ns.foaf('maker'), v['creator'])

query.pat.add(v['msg'], ns.sioc('content'), v['content'])

}

function doneQuery () {

messageTable.fresh = true // any new are fresh and so will be greenish

}

kb.query(query, renderMessage, undefined, doneQuery)

div.refresh = function () {

syncMessages(subject, messageTable)

}

// syncMessages(subject, messageTable) // no the query will do this async

return div

}