/*
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import * as functions from 'firebase-functions'

export const onMessageCreate = functions.database
.ref('/rooms/{roomId}/messages/{messageId}')
.onCreate(async (snapshot, context) => {
    const roomId = context.params.roomId
    const messageId = context.params.messageId
    console.log(`New message ${messageId} in room ${roomId}`)

    const messageData = snapshot.val()
    const text = addPizzazz(messageData.text)
    await snapshot.ref.update({ text: text })

    const countRef = snapshot.ref.parent.parent.child('messageCount')
    return countRef.transaction(count => {
        return count + 1
    })
})

export const onMessageDelete = functions.database
.ref('/rooms/{roomId}/messages/{messageId}')
.onDelete(async (snapshot, context) => {
    const countRef = snapshot.ref.parent.parent.child('messageCount')
    return countRef.transaction(count => {
        return count - 1
    })
})

function addPizzazz(text: string): string {
    return text.replace(/\bpizza\b/g, '🍕')
}

export const onMessageUpdate = functions.database
.ref('/rooms/{roomId}/messages/{messageId}')
.onUpdate((change, context) => {
    const before = change.before.val()
    const after = change.after.val()

    if (before.text === after.text) {
        console.log("Text didn't change")
        return null
    }

    const text = addPizzazz(after.text)
    const timeEdited = Date.now()
    return change.after.ref.update({ text, timeEdited })
})