import type { Cookies } from "@sveltejs/kit";
import { SessionApp, type Session } from "./sessions";
import { UserApp, type User } from "./users";
import { JoseApp } from "$lib/server/utils/jtw-utils";
import { logger } from "$lib/server/utils/logger";
import { SESSION_COOKIE_NAME } from "$lib/shared/constants";

export class AppData {

    public session: Session
    public user: User

    public constructor(
        session: Session,
        user: User
    ) {
        this.session = session
        this.user = user
    }


    public async toCookie() {

        const signedSession = await JoseApp.signObject({token: this.session.sessionToken})
        const encodedSession = btoa(signedSession)

        return encodedSession
    }

    public static async extractAppDataFromCookies(cookies: Cookies) {

        const encodedSessionToken = cookies.get(SESSION_COOKIE_NAME)

        logger.debug(`Session Cookie: ${encodedSessionToken}`, "APP Session Building 1")

        if (!encodedSessionToken) {
            return null
        }

        const decodedSessionToken = atob(encodedSessionToken)

        logger.debug(`Session Cookie: ${decodedSessionToken}`, "APP Session Building 2")

        
        
        const candidateToken = (await JoseApp.verifyObject(decodedSessionToken))

        if (!candidateToken) {
            cookies.delete(SESSION_COOKIE_NAME, {
                path: "/"
            })
            return null
        }

        const sessionToken : string = candidateToken.token

        logger.debug(`Session Token: ${sessionToken}`, "APP Session Building 3")

        const session = SessionApp.getSessionFromToken(sessionToken)

        if (!session) {
            return null
        }

        const user = UserApp.getUserFromSession(
            session
        )

        return new AppData(
            session, 
            user
        )
    }

    public toString() {
        return `User:\t${this.user}\nSession:\t${this.session}`
    }

}