const express = require("express"),
fs = require("fs"),
path = require("path"),
WebSocket = require('ws'),
sharp = require("sharp")

const PORT = process.env.PORT || 8080

const cachePath = path.join(__dirname, "cache"),
cacheFile = path.join(__dirname, "cache.json")

var lanyardData

if (!fs.existsSync(cachePath)) { fs.mkdirSync(cachePath) }
if (!fs.existsSync(cacheFile)) { 
    fs.writeFileSync(cacheFile, fs.readFileSync(path.join(__dirname, "defaults/cache.json"))) 
}

var cacheDirs = ["songs", "imgs"]
for (var i = 0; i < cacheDirs.length; i++) {
    if (!fs.existsSync(path.join(cachePath, cacheDirs[i]))) {
        fs.mkdirSync(path.join(cachePath, cacheDirs[i]))
    }
}

const imgCache = path.join(cachePath, "imgs")

var app = express()

const imgWaitMax = 2

app.get("/cached/*", (req, res) => {
    var imgURL = req.originalUrl
    imgURL = imgURL.substring(imgURL.indexOf("/", 2) + 1)
    var imgData = cachedImages.imgs[imgURL]
    
    var imgWait = 0
    function waitForImage() {
        if (imgWait < imgWaitMax) {
            imgWait += 0.1
            setTimeout(() => {
                imgData = cachedImages.imgs[imgURL]
                if (imgData) {
                    fs.createReadStream(path.join(imgCache, imgData.file)).pipe(res)
                } else {
                    waitForImage()
                }
            }, 100);
        } else {
            fs.createReadStream(path.join(__dirname, "/imgs/notFound.png")).pipe(res)
        }
    }
    if (imgData) {
        fs.createReadStream(path.join(imgCache, imgData.file)).pipe(res)
    } else {
        waitForImage()
    }
})

app.listen(PORT, () => {
    console.log("Violet's cache is now listening on port: " + PORT)
})

var cachedImages = JSON.parse(fs.readFileSync(cacheFile))

var constants = JSON.parse(fs.readFileSync(path.join(__dirname, "constants.json")))
var activityImages = constants.activityImages

var thumborURL = "https://thumbor.violets-purgatory.dev/unsafe/"
var imgExtension = "png"
var thumborArgs = `filters:format(${imgExtension})/`

function get_img_url(activity, size = "large_image") {
    if ("assets" in activity) {
        var image = activity.assets[size]

        if (image) {
            if (image.includes("mp:external")) {
                return ('https://media.discordapp.net/external' + image.substr(image.indexOf('mp:external') + 11, image.length))
            } else if (image.includes("https/")) {
                return decodeURIComponent('https://' + image.substr(image.indexOf('https/') + 6, image.length))
            } else if (image.includes("spotify")) {
                return decodeURIComponent('https://i.scdn.co/image/' + image.substr(image.indexOf('spotify:') + 8, image.length))
            } else {
                return decodeURIComponent('https://cdn.discordapp.com/app-assets/' + activity.application_id + "/" + image + ".png")
            }
        }
    }

    if (!image && size == "large_image") {
        if (activity.name in activityImages) {
            return decodeURIComponent(activityImages[activity.name])
        }
    }
    return null
}

function socketeer() {
    var lanyard = new WebSocket('https://api.violets-purgatory.dev')

    lanyard.on("error", (error) => {
        console.log(error)
    })

    lanyard.on("close", () => {
        console.log("Connection Closed. Attempting Reconnect in 30 seconds.")
        setTimeout(() => {
            socketeer()
        }, 30000);
    })

    function ping(dur) {
        lanyard.send(JSON.stringify({
            op: 3
        }))
        setTimeout(() => {
            ping(dur)
            if (Date.now() - lastPong > 120000) {
                lanyard.close()
                console.log("Max duration since last pong exceeded- Closing socket.")
            }
        }, dur);
    }

    lanyard.addEventListener("message", async (res) => {
        var data = JSON.parse(res.data)
        // console.log(data.op)
        if (data.op == 1) {
            console.log("Connected to API Websocket!")
            ping(30000)
            lastPong = Date.now()
        } else if (data.op == 3) {
            lastPong = Date.now()
        } else if (data.op == 0) {
            lanyardData = data.d

            for (let index = 0; index < lanyardData.activities.length; index++) {
                const activity = lanyardData.activities[index];

                var imgType = undefined
                var imgRes = 512
                for (var i = 0; i < 2; i++) {
                    if (get_img_url(activity, imgType)) {
                        var url = get_img_url(activity, imgType)
                        var fn = Object.keys(cachedImages.imgs).length + "." + imgExtension
                        var fp = path.join(imgCache, fn)
    
                        if (!cachedImages.imgs[url]) {
                            const response = await (await fetch(url)).arrayBuffer()
    
                            const converted = await sharp(response)
                            .resize(imgRes, imgRes)
                            .png({ progressive: true })
                            .toBuffer()

                            fs.writeFileSync(fp, converted)
                            
                            cachedImages.imgs[url] = {
                                "file": fn,
                                "lastUpdated": Date.now()
                            }

                            fs.writeFileSync(cacheFile, JSON.stringify(cachedImages))
                        }
                        imgType = "small_image"
                        imgRes = 128
                    }
                }
            }

        }
    })
}

socketeer()