use twitch_api2::types::RewardId;
use warp::{
    Filter, Reply,
    filters::BoxedFilter,
    http::Uri,
};
use crate::app::{
    State,
    config::Redemption,
    web::{
        CustomRejection,
        template::redemptions::{RedemptionsTemplate, AddRedemptionTemplate},
    },
};
use std::{
    collections::HashMap,
    convert::Infallible,
    sync::Arc,
};

pub fn redemptions_routes(state: Arc<State>) -> BoxedFilter<(impl Reply, )> {
    warp::get()
        .and(
            redemptions_get(Arc::clone(&state))
                .or(redemptions_add_get())
        )
        .or(warp::post().and(
            redemptions_add_post(Arc::clone(&state))
                .or(redemptions_delete_post(Arc::clone(&state)))
        ))
        .boxed()
}

fn redemptions_get(state: Arc<State>) -> BoxedFilter<(impl Reply, )> {
    warp::path("redemptions")
        .and(warp::path::end())
        .and_then(move || {
            let state = Arc::clone(&state);
            async move {
                Result::<RedemptionsTemplate, Infallible>::Ok(RedemptionsTemplate {
                    redemptions: state.config.read().await.redemptions.clone(),
                })
            }
        })
        .boxed()
}

fn redemptions_add_get() -> BoxedFilter<(impl Reply, )> {
    warp::path("redemptions")
        .and(warp::path("add"))
        .and(warp::path::end())
        .map(|| AddRedemptionTemplate)
        .boxed()
}

fn redemptions_add_post(state: Arc<State>) -> BoxedFilter<(impl Reply, )> {
    warp::path("redemptions")
        .and(warp::path("add"))
        .and(warp::path::end())
        .and(warp::body::content_length_limit(1024 * 5))
        .and(warp::body::form())
        .and_then(move |mut form: HashMap<String, String>| {
            let state = Arc::clone(&state);
            async move {
                let form_get = try {
                    let name = form.remove("name")?;
                    let twitch_id = form.remove("twitch_id")?;
                    let rhai = form.remove("rhai")?;
                    (name, twitch_id, rhai)
                };

                let (name, twitch_id, rhai) = match form_get {
                    Some(x) => x,
                    None => return Err(warp::reject::custom(CustomRejection::InvalidForm)),
                };

                let redemption = Redemption {
                    name,
                    twitch_id: RewardId::new(twitch_id),
                    rhai,
                };

                state.config.write().await.redemptions.push(redemption);

                Ok(warp::redirect(Uri::from_static("/redemptions")))
            }
        })
        .boxed()
}

fn redemptions_delete_post(state: Arc<State>) -> BoxedFilter<(impl Reply, )> {
    warp::path("redemptions")
        .and(warp::path("delete"))
        .and(warp::path::end())
        .and(warp::body::content_length_limit(1024 * 5))
        .and(warp::body::form())
        .and_then(move |mut form: HashMap<String, String>| {
            let state = Arc::clone(&state);
            async move {
                let name = match form.remove("name") {
                    Some(n) => n,
                    None => return Err(warp::reject::custom(CustomRejection::InvalidForm)),
                };

                state.config.write().await.redemptions.drain_filter(|redemption| redemption.name == name);

                Ok(warp::redirect(Uri::from_static("/redemptions")))
            }
        })
        .boxed()
}