#![warn(clippy::too_many_arguments)]
use rocket::{
    request::{Form, Request},
    response::{self, Responder},
};
use rocket_contrib::json::Json;

use plume_common::utils::random_hex;
use plume_models::{api_tokens::*, apps::App, users::User, Error, PlumeRocket};

type Api<T> = Result<Json<T>, ApiError>;

#[derive(Debug)]
pub struct ApiError(Error);

impl From<Error> for ApiError {
    fn from(err: Error) -> ApiError {
        ApiError(err)
    }
}

impl From<std::option::NoneError> for ApiError {
    fn from(err: std::option::NoneError) -> ApiError {
        ApiError(err.into())
    }
}

#[rocket::async_trait]
impl<'r> Responder<'r> for ApiError {
    async fn respond_to(self, req: &'r Request<'_>) -> response::Result<'r> {
        match self.0 {
            Error::NotFound => {
                Json(json!({
                    "error": "Not found"
                }))
                .respond_to(req)
                .await
            }
            Error::Unauthorized => {
                Json(json!({
                    "error": "You are not authorized to access this resource"
                }))
                .respond_to(req)
                .await
            }
            _ => {
                Json(json!({
                    "error": "Server error"
                }))
                .respond_to(req)
                .await
            }
        }
    }
}

#[derive(FromForm)]
pub struct OAuthRequest {
    client_id: String,
    client_secret: String,
    password: String,
    username: String,
    scopes: String,
}

#[get("/oauth2?<query..>")]
pub async fn oauth(
    query: Form<OAuthRequest>,
    rockets: PlumeRocket,
) -> Result<Json<serde_json::Value>, ApiError> {
    let conn = &*rockets.conn;
    let app = App::find_by_client_id(conn, &query.client_id)?;
    if app.client_secret == query.client_secret {
        if let Ok(user) = User::find_by_fqn(&rockets, &query.username).await {
            if user.auth(&query.password) {
                let token = ApiToken::insert(
                    conn,
                    NewApiToken {
                        app_id: app.id,
                        user_id: user.id,
                        value: random_hex(),
                        scopes: query.scopes.clone(),
                    },
                )?;
                Ok(Json(json!({
                    "token": token.value
                })))
            } else {
                Ok(Json(json!({
                    "error": "Invalid credentials"
                })))
            }
        } else {
            // Making fake password verification to avoid different
            // response times that would make it possible to know
            // if a username is registered or not.
            User::get(conn, 1)?.auth(&query.password);
            Ok(Json(json!({
                "error": "Invalid credentials"
            })))
        }
    } else {
        Ok(Json(json!({
            "error": "Invalid client_secret"
        })))
    }
}

pub mod apps;
pub mod authorization;
pub mod posts;