import express, { Request, Response } from "express"
import { json as bodyParserJson, urlencoded as bodyParserUrlEncoded } from "body-parser"
import cookieParser from "cookie-parser"
import { Axios } from "axios"
import * as fs from "fs"

const sw = require("js-sensitivewords")

initSensitiveWordList()

const app = express()

app.use(bodyParserJson())
app.use(bodyParserUrlEncoded({ extended: true }))
app.use(cookieParser())

app.use(express.static(__dirname + "/public"))

app.get("/", (req: Request, res: Response) => {
    res.render("layout")
})

app.post("/register", async (req: Request, res: Response) => {
    let isRegistered = req.cookies.isRegistered
    if(isRegistered) {
        return res.send("服务器正在探索：利维坦，涅索斯轨道")
    }

    let username: string = req.body.RegisterUsername
    let password: string = req.body.RegisterPassword

    if(!username || !password) {
        return res.status(400).send("注册失败：无效的用户名或密码！")
    }

    if(sw.containsDfa(username)) {
        return res.status(500).send("服务器正在探索：过往灾祸，欧洲无人区")
    }

    if(username.length < 4) {
        return res.status(400).send("账号太短啦～")
    }
    if(password.length < 4) {
        return res.status(400).send("密码太短啦～")
    }

    if(await explode_does_user_exists(username)) {
        return res.status(400).send("名字撞车啦！")
    }

    let hasId = await explode_register(username, password)

    if(hasId != null) {
        // 使用 cookie 避免重复注册
        res.cookie("isRegistered", "1", {
            expires: new Date(Date.now() + 9000000),
            httpOnly: true
        })
        
        return res.send(`注册成功，用户ID：${hasId._id}。要记住哦！`)
    } else {
        return res.status(500).send("出错啦，注册失败了。")
    }
})

const server = app.listen(8090, () => console.log("Server is running..."))

////////// Interact with Explode Server

const _axios = new Axios({})

type HasId = {
    _id: string
}

async function explode_graphql<T>(query: string) {
    return _axios.post<T>("http://43.142.173.63:10483/graphql", JSON.stringify({
        "operationName": "",
        "query": query,
        variables: {}
    }), {
        // idk why is this happening, but it just happened that
        // the response is string which should be transformed to JSON auto.
        transformResponse: (resp) => JSON.parse(resp)
    })
}

async function explode_register(username: string, password: string) {
    let response = await explode_graphql<{
        data: {
            registerUser: HasId
        }
    }>(`mutation { registerUser(username: "${username}", password: "${password}") { _id } }`)

    return response.data.data.registerUser
}

async function explode_does_user_exists(username: string) {
    let response = await explode_graphql<{
        data: {
            userByUsername: HasId | undefined
        }
    }>(`query { userByUsername(username: "${username}") { _id } }`)

    return !!response.data.data.userByUsername
}

////////// The Sensitive Words Blocking

async function initSensitiveWordList() {
    console.log("Loading sensitive words")
    let words = fs.readFileSync(__dirname + "/tencent-sensitive-words/sensitive_words_lines.txt", {encoding: "utf-8"}).split("\n")
    sw.addWords(words)
}