import express, {Application} from "express"
import path from "path"
import cookieParser from "cookie-parser"
import bodyParser from "body-parser"
import { ParseToken } from "../middleware/ParseToken"
import cors from "cors"
import {Router} from "./RouteServiceProvider";
import {IMiddlewareCollection} from "../middleware/IMiddleware";
import {IController} from "../controllers/IController";
import fs from "fs"

export class AppServiceProvider {
    #app: Application;
    #port: string;
    #router: Router;
    #baseDir: string;
    #controllers: IController[] = [];
    static #instance: AppServiceProvider;

    constructor() {
        this.#app = express();

        this.#app.use(cors());
        this.#app.use(cookieParser());
        this.#app.use(bodyParser.json());
        this.#app.use(bodyParser.urlencoded({ extended: false }));
        this.#app.use(ParseToken);

        this.#app.set("view engine", "ejs");
        this.#app.set("views", path.join(__dirname, "..", "views"))

        this.#router = Router.create();
    }

    public async loadControllers() {
        const normalizedPath = path.join(this.getBaseDir(), "controllers");

        for (const file of fs.readdirSync(normalizedPath)) {
            const importedFile = await import(this.getBaseDir() + "/controllers/" + file);
            const controller: IController = new importedFile.default() as IController;
            this.#controllers.push(controller)
        }
    }

    public static getControllers() {
        return this.getInstance().#controllers;
    }

    public static create() {
        this.#instance = new this();
        return this.#instance;
    }

    public static getInstance() {
        return this.#instance
    }

    public setBaseDir(dir) {
        this.#baseDir = dir;
    }

    public getBaseDir() {
        return this.#baseDir;
    }

    public setPort(port) {
        this.#port = port;
    }

    public getRouter() {
        return this.#router;
    }

    public registerMiddlewares(middlewareCollection: IMiddlewareCollection) {
        this.#router.setMiddlewares(middlewareCollection);
    }

    public async loadRoutes() {
        await import(this.getBaseDir()+"/routes")
    }

    public async setup(cb) {
        await cb();
    }

    public async listen() {
        console.log(this.#controllers)
        this.#app.use(this.#router.getRouter());
        console.log(this.#router.routes)
        this.#router.run()

        return this.#app.listen(this.#port, () => {
            console.log(`App started on port ${this.#port}`);
        })
    }
}