const express = require('express')
const app = express()
const helmet = require('helmet')
const bp = require('body-parser')
const cookieParser = require('cookie-parser')
const createDOMPurify = require('dompurify')
const { JSDOM } = require('jsdom')
const Controller = require('./source/controller')
const readfile = require('./source/readfile')
const session = require('./source/session')
const logger = require('./source/logger')()
const blog = require('./source/blog')
const mime = {
    html: 'text/html',
    txt: 'text/plain',
    css: 'text/css',
    gif: 'image/gif',
    jpg: 'image/jpeg',
    png: 'image/png',
    webp: 'image/webp',
    avif: 'image/avif',
    ico: 'image/ico',
    svg: 'image/svg+xml',
    js: 'application/javascript'
}
require('dotenv').config()

// Handles the routes
class App {
    constructor() {
        this.readfile = new readfile({baseUrl: process.env.baseUrl, mime: mime})
        this.controller = new Controller()
    }

    App() {
        app.use(bp.json())
        app.use(cookieParser())
        if (process.env.NODE_ENV === 'prod') {app.use(helmet())}

        app.get('/js/*', this.#Logger, (req, res) => {
            const data = this.readfile.GetFile(req.path)
            data.mime.then(output => this.#FileOpen({data: data, mime: output, res: res}))
        })
        app.get('/css/*', this.#Logger, (req, res) => {
            const data = this.readfile.GetFile(req.path)
            data.mime.then(output => this.#FileOpen({data: data, mime: output, res: res}))
        })
        app.get('/img/*', this.#Logger, (req, res) => {
            const data = this.readfile.GetFile(req.path)
            data.mime.then(output => this.#FileOpen({data: data, mime: output, res: res}))
        })

        app.route('*')
            .get(this.#ValidateCookie, this.#Logger, (req, res) => {
                this.controller.Main().then(output => {
                    this.path = {
                        split: req.path.split('/'),
                        string: req.path
                    }

                    switch (this.path.split[1]) {
                        case 'favicon.ico':
                            this.data = this.readfile.GetFavicon()
                            this.data.mime.then(output => this.#FileOpen({data: this.data, mime: output, res: res}))
                            break
                        case 'robots.txt':
                            console.log('hit')
                            this.data = this.readfile.GetRobots()
                            this.data.mime.then(output => this.#FileOpen({data: this.data, mime: output, res: res}))
                            break
                        default:
                            if (this.path.string.endsWith('/') && this.path.string.length > 1) this.path.string = this.path.string.substring(0, this.path.string.length - 1)
                            if (output.has(this.path.string)) {res.send(this.readfile.GetMain())} else {res.sendStatus(404)}
                            break

                    }
                })
            })
            .post(this.#Logger, (req, res) => {
                this.path = {
                    split: req.path.split('/'),
                    string: this.#RemoveBaseUrl(req.body.url)
                }

                if (this.path.string.endsWith('/') && this.path.string.length > 1) this.path.string = this.path.string.substring(0, this.path.string.length - 1)
                this.controller.Main(req.body.value).then(output => {
                    if (output.has(this.path.string)) {
                        const data = this.readfile.Create(output.get(this.path.string))
                        data.then(output => {
                            try {
                                const window = new JSDOM('').window
                                const DOMPurify = createDOMPurify(window)
                                const clean = DOMPurify.sanitize(output.layouts.header + output.layouts.data + output.layouts.footer)
                                res.send(clean)
                                //res.send(output.layouts.header + output.layouts.data + output.layouts.footer)
                            } catch (err) {
                                logger.Error(err)
                                res.send('Not Found')
                            }
                        })
                    } else {
                        res.send('Not Found')
                    }
                })
            })

        app.listen(3000)
    }

    #Logger(req, res, next) {
        const { cookies } = req
        try {
            logger.Info(`${req.method} ${req.path} from ${req.ip}:${cookies.session_id.replace('session_id', '')}`)
        } catch (err) {
            logger.Info(`${req.method} ${req.path} from ${req.ip}:n/a`)
        }
        next()
    }
    #FileOpen(x) {
        x.res.set('Content-Type', x.mime)
        x.data.file.on('open', () => x.data.file.pipe(x.res)).on('error', () => x.res.sendStatus(404))
    }
    #ValidateCookie(req, res, next) {
        const { cookies } = req
        session().Expired()
        if ('session_id' in cookies) {
            if (session().Exists(cookies.session_id.replace('session_id', ''))) {
                res.clearCookie('session_id')
                res.cookie('session_id', session().Create())
            }
        } else res.cookie('session_id', session().Create())
        next()
    }
    #RemoveBaseUrl(x) {
        const object = {
            baseUrlPattern: /^https?:\/\/[a-z\:0-9.]+/,
            result: '',
            url: ''
        }
        const match = object.baseUrlPattern.exec(x)
        if (match !== null) object.result = match[0]
        if (object.result.length > 0) object.result = match[0]
        if (object.result.length > 0) object.url = x.replace(object.result, '')
        return object.url
    }
}
new App().App()