import Module from '../Module.ts'
import Kernel from '../Kernel.ts'
import {Request} from '../../Request.ts'
import SetSessionCookie from './SetSessionCookie.ts'
import SessionManager from '../../session/SessionManager.ts'
import {Logging} from '../../../service/logging/Logging.ts'
import {Injectable} from '../../../../../di/src/decorator/Injection.ts'

/**
 * HTTP kernel module to retrieve and inject the session into the request.
 * @extends Module
 */
@Injectable()
export default class InjectSession extends Module {
    public static register(kernel: Kernel) {
        kernel.register(this).after(SetSessionCookie)
    }

    constructor(
        protected readonly sessions: SessionManager,
        protected readonly logger: Logging,
    ) {
        super()
    }

    /**
     * Lookup or create the session object and inject it into the request.
     * @param {Request} request
     */
    public async apply(request: Request): Promise<Request> {
        if ( request.session ) return request

        let key: string | undefined
        try {
            const result = await request.cookies.get('daton.session')
            key = result?.value
        } catch (e) {
            this.logger.error('Invalid Daton session cookie. The session will not be injected.')

            try {
                this.logger.debug(`Cookie: ${await request.cookies.get_raw('daton.session')}`)
            } catch (e2) {}

            this.logger.debug(e)
            return request
        }

        if ( !key ) {
            this.logger.warn(`No session key was found. Is the SetSessionCookie module registered?`)
            return request
        }

        const has_existing = await this.sessions.has_session(key)
        if ( has_existing ) {
            request.session = await this.sessions.get_session(key)
            return request
        }

        const new_session = await this.sessions.get_session()
        this.logger.verbose(`Populating new session: ${key}`)
        new_session.set_key(key)
        await new_session.persist()
        request.session = new_session

        return request
    }
}