use std::env;

use actix_web::{
  get, post, web, HttpResponse, ResponseError,
  cookie::{Cookie, time::Duration},
  HttpRequest,
};
use log::error;
use redis::AsyncCommands;
use siren::ServiceError;

use crate::{
  auth::{InsertUser, Auth, LoginRequest, QueryUser, RegisterUser, Session, SESSION_COOKIE_NAME},
  storage::{self},
};

use super::verify_hash;

#[post("/register")]
async fn register(user: web::Json<RegisterUser>) -> HttpResponse {
  let register_user = user.0;
  let insert_user: InsertUser = match register_user.convert_to_insert() {
    Ok(user) => user,
    Err(err) => return ResponseError::error_response(&err),
  };
  match InsertUser::insert(insert_user) {
    Ok(_) => HttpResponse::Created().finish(),
    Err(err) => {
      // Obfuscate the service error message to prevent leaking database details
      if err.status == 409 {
        return HttpResponse::Conflict().finish();
      } else {
        return ResponseError::error_response(&err);
      }
    }
  }
}

#[post("/login")]
async fn login(request: HttpRequest, login_request: web::Json<LoginRequest>) -> HttpResponse {
  let email = login_request.email.clone();
  // Get IP address
  let ip_address = request.peer_addr().unwrap().ip().to_string();

  let query_user = match QueryUser::get_by_email(&email) {
    Ok(query_user) => query_user,
    Err(_) => {
      return ResponseError::error_response(&ServiceError {
        status: 401,
        message: "The email or password was incorrect.".to_string(),
      })
    }
  };
  // Verify password
  if verify_hash(&login_request.password, &query_user.hash) {
    let session = Session::new(&email, &ip_address);

    let mut conn = match storage::redis_async_connection().await {
      Ok(conn) => conn,
      Err(err) => {
        error!("Failed to get redis connection: {}", err);
        return ResponseError::error_response(&err);
      }
    };

    let session_ttl = env::var("SESSION_TTL")
      .expect("SESSION_TTL must be set")
      .parse::<i64>()
      .expect("SESSION_TTL must be an integer");

    let session_result: redis::RedisResult<()> = conn
      .set_ex(
        session.id.to_string(),
        &serde_json::to_string(&session).unwrap(),
        (session_ttl * 60) as usize,
      )
      .await;
    if let Err(err) = session_result {
      error!("Failed to set access token in redis: {}", err);
      return ResponseError::error_response(&ServiceError::from(err));
    };

    let session_cookie = Cookie::build(SESSION_COOKIE_NAME, session.id.clone())
      .path("/")
      .max_age(Duration::new(session_ttl * 60, 0))
      .http_only(true)
      .secure(true)
      .finish();
    let user_id_cookie = Cookie::build("user_id", session.user_id.clone())
      .path("/")
      .max_age(Duration::new(session_ttl * 60, 0))
      .http_only(false)
      .finish();

    HttpResponse::Ok()
      .cookie(session_cookie)
      .cookie(user_id_cookie)
      .json(Auth {
        id: session.id,
        user: query_user.into(),
      })
  } else {
    return ResponseError::error_response(&ServiceError {
      status: 401,
      message: "The email or password was incorrect.".to_string(),
    });
  }
}

#[get("/refresh")]
async fn refresh(req: HttpRequest, auth: Auth) -> HttpResponse {
  let ip_address = req.peer_addr().unwrap().ip().to_string();

  let mut conn = match storage::redis_async_connection().await {
    Ok(conn) => conn,
    Err(err) => {
      error!("Failed to get redis connection: {}", err);
      return ResponseError::error_response(&err);
    }
  };

  let session_ttl = env::var("SESSION_TTL")
    .expect("SESSION_TTL must be set")
    .parse::<i64>()
    .expect("SESSION_TTL must be an integer");

  // Delete old session
  let _: redis::RedisResult<()> = conn.del(auth.id).await;

  // Create new session
  let session = Session::new(&auth.user.email, &ip_address);
  let session_result: redis::RedisResult<()> = conn
    .set_ex(
      session.id.to_string(),
      &serde_json::to_string(&session).unwrap(),
      (session_ttl * 60) as usize,
    )
    .await;
  if let Err(err) = session_result {
    error!("Failed to set session id in redis: {}", err);
    return ResponseError::error_response(&ServiceError::from(err));
  };

  // Create cookies
  let session_cookie = session.create_cookie();
  let user_id_cookie = Cookie::build("user_id", session.user_id.clone())
    .path("/")
    .max_age(Duration::new(session_ttl * 60, 0))
    .http_only(false)
    .finish();

  HttpResponse::Ok()
    .cookie(session_cookie)
    .cookie(user_id_cookie)
    .json(Auth {
      id: session.id,
      user: auth.user,
    })
}

#[post("/logout")]
async fn logout(auth: Auth) -> HttpResponse {
  let mut conn = match storage::redis_async_connection().await {
    Ok(conn) => conn,
    Err(err) => {
      error!("Failed to get redis connection: {}", err);
      return ResponseError::error_response(&err);
    }
  };

  let session_result: redis::RedisResult<()> = conn.del(&auth.id.to_string()).await;
  if let Err(err) = session_result {
    error!("Failed to remove session id in redis: {}", err);
    return ResponseError::error_response(&ServiceError::from(err));
  };

  let session_cookie = Cookie::build(SESSION_COOKIE_NAME, "")
    .path("/")
    .max_age(Duration::new(-1, 0))
    .secure(true)
    .http_only(true)
    .finish();
  let user_id_cookie = Cookie::build("user_id", "")
    .path("/")
    .max_age(Duration::new(-1, 0))
    .http_only(true)
    .finish();

  HttpResponse::Ok()
    .cookie(session_cookie)
    .cookie(user_id_cookie)
    .finish()
}

#[get("/me")]
async fn me(auth: Auth) -> HttpResponse {
  HttpResponse::Ok().json(auth)
}

#[get("/roles")]
async fn roles() -> HttpResponse {
  HttpResponse::Ok().json(vec!["admin", "user"])
}

pub fn init_routes(config: &mut web::ServiceConfig) {
  // TODO: Remove this when deploying
  let r = RegisterUser {
    email: "admin".to_string(),
    password: "admin".to_string(),
    first_name: "Admin".to_string(),
    last_name: "Admin".to_string(),
  };
  let mut u = r.convert_to_insert().unwrap();
  u.role = "admin".to_string();
  u.verified = true;
  let _ = InsertUser::insert(u);
  config.service(
    web::scope("auth")
      .service(register)
      .service(login)
      .service(refresh)
      .service(logout)
      .service(me)
      .service(roles),
  );
}