use actix::{Actor, AsyncContext, Context, Handler};
use actix::Message;

use crate::constants::*;
use crate::data::access_token::AccessToken;
use crate::data::app_config::AppConfig;
use crate::data::client::ClientID;
use crate::data::code_challenge::CodeChallenge;
use crate::data::jwt_signer::JWTSigner;
use crate::data::user::UserID;
use crate::utils::err::Res;
use crate::utils::string_utils::rand_str;
use crate::utils::time::time;

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize, Eq, PartialEq)]
pub struct SessionID(pub String);

#[derive(Clone, Debug)]
pub struct Session {
    pub session_id: SessionID,
    pub client: ClientID,
    pub user: UserID,
    pub auth_time: u64,
    pub redirect_uri: String,

    pub authorization_code: String,
    pub authorization_code_expire_at: u64,

    pub access_token: Option<String>,
    pub access_token_expire_at: u64,
    pub refresh_token: String,
    pub refresh_token_expire_at: u64,

    pub nonce: Option<String>,
    pub code_challenge: Option<CodeChallenge>,
}

impl Session {
    pub fn is_expired(&self) -> bool {
        self.authorization_code_expire_at < time() && self.access_token_expire_at < time()
            && self.refresh_token_expire_at < time()
    }

    pub fn regenerate_access_and_refresh_tokens(&mut self,
                                                app_config: &AppConfig,
                                                jwt_signer: &JWTSigner) -> Res {
        let access_token = AccessToken {
            issuer: app_config.website_origin.to_string(),
            subject_identifier: self.user.clone(),
            issued_at: time(),
            exp_time: time() + OPEN_ID_ACCESS_TOKEN_TIMEOUT,
            rand_val: rand_str(OPEN_ID_ACCESS_TOKEN_LEN),
            nonce: self.nonce.clone(),
        };
        self.access_token_expire_at = access_token.exp_time;
        self.access_token = Some(jwt_signer.sign_token(access_token.to_jwt_claims())?);

        self.refresh_token = rand_str(OPEN_ID_REFRESH_TOKEN_LEN);
        self.refresh_token_expire_at = OPEN_ID_REFRESH_TOKEN_TIMEOUT + time();

        Ok(())
    }
}

#[derive(Message)]
#[rtype(result = "()")]
pub struct PushNewSession(pub Session);

#[derive(Message)]
#[rtype(result = "Option<Session>")]
pub struct FindSessionByAuthorizationCode(pub String);

#[derive(Message)]
#[rtype(result = "Option<Session>")]
pub struct FindSessionByRefreshToken(pub String);

#[derive(Message)]
#[rtype(result = "Option<Session>")]
pub struct FindSessionByAccessToken(pub String);

#[derive(Message)]
#[rtype(result = "()")]
pub struct UpdateSession(pub Session);

#[derive(Default)]
pub struct OpenIDSessionsActor {
    session: Vec<Session>,
}

impl OpenIDSessionsActor {
    pub fn clean_old_sessions(&mut self) {
        self.session.retain(|s| !s.is_expired());
    }
}

impl Actor for OpenIDSessionsActor {
    type Context = Context<Self>;

    fn started(&mut self, ctx: &mut Self::Context) {
        // Clean up at a regular interval failed attempts
        ctx.run_interval(OPEN_ID_SESSION_CLEANUP_INTERVAL, |act, _ctx| {
            log::trace!("Cleaning up old login sessions");
            act.clean_old_sessions();
        });
    }
}

impl Handler<PushNewSession> for OpenIDSessionsActor {
    type Result = ();

    fn handle(&mut self, msg: PushNewSession, _ctx: &mut Self::Context) -> Self::Result {
        self.session.push(msg.0)
    }
}

impl Handler<FindSessionByAuthorizationCode> for OpenIDSessionsActor {
    type Result = Option<Session>;

    fn handle(&mut self, msg: FindSessionByAuthorizationCode, _ctx: &mut Self::Context) -> Self::Result {
        self.session
            .iter()
            .find(|f| f.authorization_code.eq(&msg.0))
            .cloned()
    }
}

impl Handler<FindSessionByRefreshToken> for OpenIDSessionsActor {
    type Result = Option<Session>;

    fn handle(&mut self, msg: FindSessionByRefreshToken, _ctx: &mut Self::Context) -> Self::Result {
        self.session
            .iter()
            .find(|f| f.refresh_token.eq(&msg.0))
            .cloned()
    }
}

impl Handler<FindSessionByAccessToken> for OpenIDSessionsActor {
    type Result = Option<Session>;

    fn handle(&mut self, msg: FindSessionByAccessToken, _ctx: &mut Self::Context) -> Self::Result {
        self.session
            .iter()
            .find(|f| f.access_token.as_ref().map(|t| t.eq(&msg.0)).unwrap_or(false))
            .cloned()
    }
}

impl Handler<UpdateSession> for OpenIDSessionsActor {
    type Result = ();

    fn handle(&mut self, msg: UpdateSession, _ctx: &mut Self::Context) -> Self::Result {
        if let Some(r) = self.session.iter().enumerate()
            .find(|f| f.1.session_id.eq(&msg.0.session_id)).map(|f| f.0) {
            self.session[r] = msg.0;
        }
    }
}