mod api_v1;

use std::sync::Arc;

use actix::Addr;
use actix_session::Session;
use actix_web::web::{scope, Data, Json, ServiceConfig};
use actix_web::{delete, get, post, HttpResponse};
use serde::{Deserialize, Serialize};

use crate::database::{AccountByIdentity, Database};
use crate::logic::encrypt_password;
use crate::model::{Account, Email, Login, PassHash, Password, PasswordConfirmation, Role};
use crate::routes::{RequireLogin, Result};
use crate::{database, model, routes, Config};

#[macro_export]
macro_rules! admin_send_db {
    ($db: expr, $msg: expr) => {{
        let db = $db;
        return match db.send($msg).await {
            Ok(Ok(res)) => Ok(HttpResponse::Ok().json(res)),
            Ok(Err(e)) => {
                log::error!("{}", e);
                Err(crate::routes::Error::Admin(Error::Database(e)))
            }
            Err(e) => {
                log::error!("{}", e);
                Err(crate::routes::Error::Admin(Error::DatabaseConnection))
            }
        };
    }};
}

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("Can't register new account")]
    Register,
    #[error("Can't hash password")]
    HashPass,
    #[error("Internal server error")]
    DatabaseConnection,
    #[error("{0}")]
    Database(#[from] database::Error),
}

#[derive(Serialize)]
pub struct LogoutResponse {}

#[delete("logout")]
async fn logout(session: Session) -> Result<HttpResponse> {
    session.require_admin()?;
    session.clear();

    Ok(HttpResponse::NotImplemented().body(""))
}

#[derive(Deserialize, Debug)]
pub struct SignInInput {
    login: Option<Login>,
    email: Option<Email>,
    password: Password,
}

#[post("/sign-in")]
async fn sign_in(
    session: Session,
    db: Data<Addr<Database>>,
    Json(payload): Json<SignInInput>,
) -> Result<HttpResponse> {
    log::debug!("{:?}", payload);
    let db = db.into_inner();
    let user: model::FullAccount = match db
        .send(AccountByIdentity {
            email: payload.email,
            login: payload.login,
        })
        .await
    {
        Ok(Ok(user)) => user,
        Ok(Err(e)) => {
            log::error!("{}", e);
            return Err(routes::Error::Unauthorized);
        }
        Err(e) => {
            log::error!("{}", e);
            return Err(routes::Error::Unauthorized);
        }
    };
    if let Err(e) = crate::logic::validate_password(&payload.password, &user.pass_hash) {
        log::error!("Password validation failed. {}", e);
        Err(routes::Error::Unauthorized)
    } else {
        if let Err(e) = session.insert("admin_id", *user.id) {
            log::error!("{:?}", e);
        }
        Ok(HttpResponse::Ok().json(model::Account::from(user)))
    }
}

#[derive(Deserialize)]
pub struct RegisterInput {
    pub login: Login,
    pub email: Email,
    pub password: Password,
    pub password_confirmation: PasswordConfirmation,
    pub role: Role,
}

#[derive(Serialize, Default)]
pub struct RegisterResponse {
    pub success: bool,
    pub errors: Vec<RegisterError>,
    pub account: Option<Account>,
}

#[derive(Serialize)]
pub enum RegisterError {
    PasswordDiffer,
}

// login_required
#[post("/register")]
async fn register(
    session: Session,
    Json(input): Json<RegisterInput>,
    db: Data<Addr<Database>>,
    config: Data<Arc<Config>>,
) -> Result<HttpResponse> {
    let mut response = RegisterResponse::default();
    session.require_admin()?;

    if input.password != input.password_confirmation {
        response.errors.push(RegisterError::PasswordDiffer);
    }

    let hash = match encrypt_password(&input.password, &config.pass_salt) {
        Ok(s) => s,
        Err(e) => {
            log::error!("{e:?}");
            return Err(routes::Error::Admin(Error::HashPass));
        }
    };

    match db
        .send(database::CreateAccount {
            email: input.email,
            login: input.login,
            pass_hash: PassHash(hash),
            role: input.role,
        })
        .await
    {
        Ok(Ok(account)) => {
            response.account = Some(account.into());
        }
        Ok(Err(e)) => {
            log::error!("{}", e);
            return Err(super::Error::Admin(Error::Register));
        }
        Err(e) => {
            log::error!("{}", e);
            return Err(super::Error::Admin(Error::Register));
        }
    };

    response.success = response.errors.is_empty();
    Ok(if response.success {
        HttpResponse::Ok().json(response)
    } else {
        HttpResponse::BadRequest().json(response)
    })
}

#[get("")]
async fn landing() -> Result<HttpResponse> {
    Ok(HttpResponse::NotImplemented()
        .append_header(("Content-Type", "text/html"))
        .body(include_str!("../../../assets/index.html")))
}

pub fn configure(config: &mut ServiceConfig) {
    config.service(
        scope("/admin")
            .service(sign_in)
            .service(logout)
            .service(register)
            .service(landing)
            .configure(api_v1::configure),
    );
}