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import _ from 'lodash'
const empty = (chatId) => {
return {
idIndex: {},
messages: [],
newMessageCount: 0,
lastSeenTimestamp: 0,
chatId: chatId,
minId: undefined,
lastMessage: undefined
}
}
const clear = (storage) => {
storage.idIndex = {}
storage.messages.splice(0, storage.messages.length)
storage.newMessageCount = 0
storage.lastSeenTimestamp = 0
storage.minId = undefined
storage.lastMessage = undefined
}
const deleteMessage = (storage, messageId) => {
if (!storage) { return }
storage.messages = storage.messages.filter(m => m.id !== messageId)
delete storage.idIndex[messageId]
if (storage.lastMessage && (storage.lastMessage.id === messageId)) {
storage.lastMessage = _.maxBy(storage.messages, 'id')
}
if (storage.minId === messageId) {
storage.minId = _.minBy(storage.messages, 'id')
}
}
const add = (storage, { messages: newMessages }) => {
if (!storage) { return }
for (let i = 0; i < newMessages.length; i++) {
const message = newMessages[i]
// sanity check
if (message.chat_id !== storage.chatId) { return }
if (!storage.minId || message.id < storage.minId) {
storage.minId = message.id
}
if (!storage.lastMessage || message.id > storage.lastMessage.id) {
storage.lastMessage = message
}
if (!storage.idIndex[message.id]) {
if (storage.lastSeenTimestamp < message.created_at) {
storage.newMessageCount++
}
storage.messages.push(message)
storage.idIndex[message.id] = message
}
}
}
const resetNewMessageCount = (storage) => {
if (!storage) { return }
storage.newMessageCount = 0
storage.lastSeenTimestamp = new Date()
}
// Inserts date separators and marks the head and tail if it's the chain of messages made by the same user
const getView = (storage) => {
if (!storage) { return [] }
const result = []
const messages = _.sortBy(storage.messages, ['id', 'desc'])
const firstMessages = messages[0]
let prev = messages[messages.length - 1]
let currentMessageChainId
if (firstMessages) {
const date = new Date(firstMessages.created_at)
date.setHours(0, 0, 0, 0)
result.push({
type: 'date',
date,
id: date.getTime().toString()
})
}
let afterDate = false
for (let i = 0; i < messages.length; i++) {
const message = messages[i]
const nextMessage = messages[i + 1]
const date = new Date(message.created_at)
date.setHours(0, 0, 0, 0)
// insert date separator and start a new message chain
if (prev && prev.date < date) {
result.push({
type: 'date',
date,
id: date.getTime().toString()
})
prev['isTail'] = true
currentMessageChainId = undefined
afterDate = true
}
const object = {
type: 'message',
data: message,
date,
id: message.id,
messageChainId: currentMessageChainId
}
// end a message chian
if ((nextMessage && nextMessage.account_id) !== message.account_id) {
object['isTail'] = true
currentMessageChainId = undefined
}
// start a new message chain
if ((prev && prev.data && prev.data.account_id) !== message.account_id || afterDate) {
currentMessageChainId = _.uniqueId()
object['isHead'] = true
object['messageChainId'] = currentMessageChainId
}
result.push(object)
prev = object
afterDate = false
}
return result
}
const ChatService = {
add,
empty,
getView,
deleteMessage,
resetNewMessageCount,
clear
}
export default ChatService
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