#[macro_use]
extern crate rocket;

mod config;
mod feed;
mod meta;
mod scrape;
mod torrent;

use btracker_fs::public::{Order, Sort, Storage};
use btracker_scrape::Scrape;
use config::Config;
use feed::Feed;
use meta::Meta;
use rocket::{State, http::Status, response::content::RawXml, serde::Serialize};
use rocket_dyn_templates::{Template, context};
use std::str::FromStr;
use torrent::Torrent;

#[get("/?<search>&<page>")]
fn index(
    search: Option<&str>,
    page: Option<usize>,
    scrape: &State<Scrape>,
    storage: &State<Storage>,
    meta: &State<Meta>,
) -> Result<Template, Status> {
    #[derive(Serialize)]
    #[serde(crate = "rocket::serde")]
    struct R {
        created: Option<String>,
        files: Option<usize>,
        indexed: String,
        magnet: String,
        scrape: Option<scrape::Result>,
        size: String,
        torrent: Torrent,
    }
    let (total, torrents) = storage
        .torrents(
            search,
            Some((Sort::Modified, Order::Desc)),
            page.map(|p| if p > 0 { p - 1 } else { p } * storage.default_limit),
            Some(storage.default_limit),
        )
        .map_err(|e| {
            error!("Torrents public storage read error: `{e}`");
            Status::InternalServerError
        })?;
    Ok(Template::render(
        "index",
        context! {
            title: {
                let mut t = String::new();
                if let Some(q) = search && !q.is_empty() {
                    t.push_str(q);
                    t.push_str(S);
                    t.push_str("Search");
                    t.push_str(S)
                }
                if let Some(p) = page && p > 1 {
                    t.push_str(&format!("Page {p}"));
                    t.push_str(S)
                }
                t.push_str(&meta.title);
                if let Some(ref description) = meta.description
                        && page.is_none_or(|p| p == 1) && search.is_none_or(|q| q.is_empty()) {
                    t.push_str(S);
                    t.push_str(description)
                }
                t
            },
            meta: meta.inner(),
            back: page.map(|p| uri!(index(search, if p > 2 { Some(p - 1) } else { None }))),
            next: if page.unwrap_or(1) * storage.default_limit >= total { None }
                    else { Some(uri!(index(search, Some(page.map_or(2, |p| p + 1))))) },
            rows: torrents
                .into_iter()
                .filter_map(|t| match Torrent::from_public(&t.bytes, t.time) {
                    Ok(torrent) => Some(R {
                        created: torrent.creation_date.map(|t| t.format(&meta.format_time).to_string()),
                        files: torrent.files(),
                        indexed: torrent.time.format(&meta.format_time).to_string(),
                        magnet: torrent.magnet(meta.trackers.as_ref()),
                        scrape: scrape::get(scrape, torrent.id.0),
                        size: torrent.size(),
                        torrent
                    }),
                    Err(e) => {
                        error!("Torrent storage read error: `{e}`");
                        None
                    }
                })
                .collect::<Vec<R>>(),
            page: page.unwrap_or(1),
            pages: (total as f64 / storage.default_limit as f64).ceil(),
            total,
            search
        },
    ))
}

#[get("/<info_hash>")]
fn info(
    info_hash: &str,
    storage: &State<Storage>,
    scrape: &State<Scrape>,
    meta: &State<Meta>,
) -> Result<Template, Status> {
    let i = librqbit_core::Id20::from_str(info_hash).map_err(|_| Status::NotFound)?;
    match storage.torrent(i) {
        Some(t) => {
            #[derive(Serialize)]
            #[serde(crate = "rocket::serde")]
            struct F {
                href: Option<String>,
                path: String,
                size: String,
            }
            let torrent = Torrent::from_public(&t.bytes, t.time).map_err(|e| {
                error!("Torrent parse error: `{e}`");
                Status::InternalServerError
            })?;
            Ok(Template::render(
                "info",
                context! {
                    title: {
                        let mut t = String::new();
                        if let Some(ref name) = torrent.name {
                            t.push_str(name);
                            t.push_str(S)
                        }
                        t.push_str(&meta.title);
                        t
                    },
                    meta: meta.inner(),
                    created: torrent.creation_date.map(|t| t.format(&meta.format_time).to_string()),
                    files_total: torrent.files(),
                    files_list: torrent.files.as_ref().map(|f| {
                        f.iter()
                            .map(|f| {
                                let p = f.path();
                                F {
                                    href: storage.href(&torrent.info_hash, &p),
                                    path: p,
                                    size: f.size(),
                                }
                            })
                            .collect::<Vec<F>>()
                    }),
                    indexed: torrent.time.format(&meta.format_time).to_string(),
                    magnet: torrent.magnet(meta.trackers.as_ref()),
                    scrape: scrape::get(scrape, i.0),
                    size: torrent.size(),
                    torrent
                },
            ))
        }
        None => Err(Status::NotFound),
    }
}

#[get("/rss")]
fn rss(meta: &State<Meta>, storage: &State<Storage>) -> Result<RawXml<String>, Status> {
    let mut f = Feed::new(
        &meta.title,
        meta.description.as_deref(),
        meta.canonical.clone(),
        1024, // @TODO
    );
    for t in storage
        .torrents(
            None,
            Some((Sort::Modified, Order::Desc)),
            None,
            Some(storage.default_limit),
        )
        .map_err(|e| {
            error!("Torrent storage read error: `{e}`");
            Status::InternalServerError
        })?
        .1
    {
        f.push(Torrent::from_public(&t.bytes, t.time).map_err(|e| {
            error!("Torrent parse error: `{e}`");
            Status::InternalServerError
        })?)
    }
    Ok(RawXml(f.commit()))
}

#[launch]
fn rocket() -> _ {
    use clap::Parser;
    let config = Config::parse();
    if config.canonical_url.is_none() {
        warn!("Canonical URL option is required for the RSS feed by the specification!") // @TODO
    }
    let scrape = Scrape::init(
        config
            .scrape
            .map(|u| {
                u.into_iter()
                    .map(|url| {
                        use std::str::FromStr;
                        if url.scheme() == "tcp" {
                            todo!("TCP scrape is not implemented")
                        }
                        if url.scheme() != "udp" {
                            todo!("Scheme `{}` is not supported", url.scheme())
                        }
                        std::net::SocketAddr::new(
                            std::net::IpAddr::from_str(
                                url.host_str()
                                    .expect("Required valid host value")
                                    .trim_start_matches('[')
                                    .trim_end_matches(']'),
                            )
                            .unwrap(),
                            url.port().expect("Required valid port value"),
                        )
                    })
                    .collect()
            })
            .map(|a| (config.udp, a)),
    );
    rocket::build()
        .attach(Template::fairing())
        .configure(rocket::Config {
            port: config.port,
            address: config.host,
            ..if config.debug {
                rocket::Config::debug_default()
            } else {
                rocket::Config::release_default()
            }
        })
        .manage(scrape)
        .manage(Storage::init(&config.public, config.list_limit, config.capacity).unwrap())
        .manage(Meta {
            canonical: config.canonical_url,
            description: config.description,
            format_time: config.format_time,
            title: config.title,
            trackers: config.tracker,
            version: env!("CARGO_PKG_VERSION").into(),
        })
        .mount("/", rocket::fs::FileServer::from(config.public))
        .mount("/", routes![index, rss, info])
}

const S: &str = " • ";