use crate::simple::database::PgSharedPool;
use crate::simple::http::reply_json;

use warp::{Filter, Rejection, Reply};

use warp::filters::{body, method, query as params};
use warp::http::StatusCode;

use serde::{Deserialize, Serialize};

use crate::app;

#[derive(Deserialize)]
struct PaginationOptions {
    pub offset: i64,
    pub limit: i64,
}

#[derive(Serialize)]
struct Pagination<T> {
    pub data: Vec<T>,
    pub next: bool,
}

// add a new robot entry
async fn create(
    shared: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
    r: app::forms::GetRobot,
) -> Result<impl Reply, Rejection> {
    reply_json(app::robots::add_robot(shared, r).await)
}

// retrieve information of a single robot
async fn get(
    shared: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
    id: i64,
) -> Result<impl Reply, Rejection> {
    reply_json(app::robots::get_robot(shared, id).await)
}

// updates robot information
async fn update(
    pool: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
    id: i64,
    r: app::forms::GetRobot,
) -> Result<impl Reply, Rejection> {
    reply_json(app::robots::update_robot(pool, id, r).await)
}

// returns a pagination of all robots
async fn get_all(
    pool: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
    p: PaginationOptions,
) -> Result<impl Reply, Rejection> {
    reply_json(
        app::robots::get_all(pool, p.offset, p.limit)
            .await
            .map(|(r, next)| Pagination {
                data: r,
                next: next,
            }),
    )
}

// will delete the requested robot
async fn delete(
    pool: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
    id: i64,
) -> Result<impl Reply, Rejection> {
    match app::robots::delete_robot(pool, id).await {
        Ok(_) => Ok(warp::reply::with_status(
            warp::reply(),
            StatusCode::NO_CONTENT,
        )),
        Err(e) => Err(warp::reject::custom(e)),
    }
}

// builds the route structure for "/robots" endpoint
pub fn all(
    base: warp::filters::BoxedFilter<(impl Reply + 'static,)>,
    pool: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
) -> warp::filters::BoxedFilter<(impl Reply,)> {
    // create a prefix that injects a database connection for every request
    // every filter is added after the prefix so it receives a database connection
    let prefix = warp::path!("robots").map(move || pool.clone());

    base.or(
        // filter for creating new robots
        prefix
            .clone()
            // match HTTP POST method
            .and(method::post())
            // attempts to parse the request's body as JSON
            .and(body::json())
            // bind the handler
            .and_then(create),
    )
    .or(
        // filter for retrieving a pagination of robots
        prefix
            .clone()
            // match HTTP GET method
            .and(method::get())
            // add pagination query parameters
            .and(params::query())
            // bind the handler
            .and_then(get_all),
    )
    .boxed()
}

// builds the route structure for the "/robot/{id}" endpoint
pub fn with_id(
    base: warp::filters::BoxedFilter<(impl Reply + 'static,)>,
    pool: std::sync::Arc<std::boxed::Box<crate::simple::shared::SharedContainer>>,
) -> warp::filters::BoxedFilter<(impl Reply,)> {
    // we create a prefix containing the id of a robot and a shared database connection
    // every filter is added after the prefix
    // so it receives a robot's id and a database connection
    let prefix = warp::path!("robot" / i64)
        .map(move |id| (pool.clone(), id))
        .untuple_one();

    // append the routes to the base filter
    base.or(
        // filter to get information on a robot
        prefix
            .clone()
            // match HTTP GET method
            .and(method::get())
            // bind the handler
            .and_then(get),
    )
    .or(
        // filter for updating individual robots
        prefix
            .clone()
            // match HTTP POST method
            .and(method::put())
            // attempts to parse the request's body as JSON
            .and(body::json())
            // bind the handler
            .and_then(update),
    )
    .or(
        // filter that deletes a robot entry
        prefix
            .clone()
            // match HTTP DELETE method
            .and(method::delete())
            // bind the handler
            .and_then(delete),
    )
    .boxed()
}