#![allow(clippy::too_many_arguments)]
#![feature(decl_macro, proc_macro_hygiene, try_trait)]

#[macro_use]
extern crate gettext_macros;
#[macro_use]
extern crate rocket;
#[macro_use]
extern crate serde_json;
#[macro_use]
extern crate validator_derive;

use chrono::Utc;
use clap::App;
use diesel::r2d2::ConnectionManager;
use plume_models::{
    db_conn::{DbPool, PragmaForeignKey},
    instance::Instance,
    migrations::IMPORTED_MIGRATIONS,
    search::{Searcher as UnmanagedSearcher, SearcherError},
    Connection, Error, CONFIG,
};
use rocket_csrf::CsrfFairingBuilder;
use scheduled_thread_pool::ScheduledThreadPool;
use std::fs;
use std::path::Path;
use std::process::exit;
use std::sync::{Arc, Mutex};
use std::time::Duration;

init_i18n!(
    "plume", ar, bg, ca, cs, de, en, eo, es, fa, fr, gl, hi, hr, it, ja, nb, pl, pt, ro, ru, sr,
    sk, sv
);

mod api;
mod inbox;
mod mail;
#[macro_use]
mod template_utils;
mod routes;
#[macro_use]
extern crate shrinkwraprs;
#[cfg(feature = "test")]
mod test_routes;

include!(concat!(env!("OUT_DIR"), "/templates.rs"));

compile_i18n!();

/// Initializes a database pool.
fn init_pool() -> Option<DbPool> {
    match dotenv::dotenv() {
        Ok(path) => println!("Configuration read from {}", path.display()),
        Err(ref e) if e.not_found() => eprintln!("no .env was found"),
        e => e.map(|_| ()).unwrap(),
    }

    let manager = ConnectionManager::<Connection>::new(CONFIG.database_url.as_str());
    let mut builder = DbPool::builder()
        .connection_customizer(Box::new(PragmaForeignKey))
        .min_idle(CONFIG.db_min_idle);
    if let Some(max_size) = CONFIG.db_max_size {
        builder = builder.max_size(max_size);
    };
    let pool = builder.build(manager).ok()?;
    Instance::cache_local(&pool.get().unwrap());
    Some(pool)
}

fn main() {
    App::new("Plume")
        .bin_name("plume")
        .version(env!("CARGO_PKG_VERSION"))
        .about("Plume backend server")
        .after_help(
            r#"
The plume command should be run inside the directory
containing the `.env` configuration file and `static` directory.
See https://docs.joinplu.me/installation/config
and https://docs.joinplu.me/installation/init for more info.
        "#,
        )
        .get_matches();
    let dbpool = init_pool().expect("main: database pool initialization error");
    if IMPORTED_MIGRATIONS
        .is_pending(&dbpool.get().unwrap())
        .unwrap_or(true)
    {
        panic!(
            r#"
It appear your database migration does not run the migration required
by this version of Plume. To fix this, you can run migrations via
this command:

    plm migration run

Then try to restart Plume.
"#
        )
    }
    let workpool = ScheduledThreadPool::with_name("worker {}", num_cpus::get());
    // we want a fast exit here, so
    let mut open_searcher =
        UnmanagedSearcher::open(&CONFIG.search_index, &CONFIG.search_tokenizers);
    if let Err(Error::Search(SearcherError::InvalidIndexDataError)) = open_searcher {
        if UnmanagedSearcher::create(&CONFIG.search_index, &CONFIG.search_tokenizers).is_err() {
            let current_path = Path::new(&CONFIG.search_index);
            let backup_path = format!("{}.{}", &current_path.display(), Utc::now().timestamp());
            let backup_path = Path::new(&backup_path);
            fs::rename(current_path, backup_path)
                .expect("main: error on backing up search index directory for recreating");
            if UnmanagedSearcher::create(&CONFIG.search_index, &CONFIG.search_tokenizers).is_ok() {
                if fs::remove_dir_all(backup_path).is_err() {
                    eprintln!(
                        "error on removing backup directory: {}. it remains",
                        backup_path.display()
                    );
                }
            } else {
                panic!("main: error on recreating search index in new index format. remove search index and run `plm search init` manually");
            }
        }
        open_searcher = UnmanagedSearcher::open(&CONFIG.search_index, &CONFIG.search_tokenizers);
    }
    #[allow(clippy::match_wild_err_arm)]
    let searcher = match open_searcher {
        Err(Error::Search(e)) => match e {
            SearcherError::WriteLockAcquisitionError => panic!(
                r#"
Your search index is locked. Plume can't start. To fix this issue
make sure no other Plume instance is started, and run:

    plm search unlock

Then try to restart Plume.
"#
            ),
            SearcherError::IndexOpeningError => panic!(
                r#"
Plume was unable to open the search index. If you created the index
before, make sure to run Plume in the same directory it was created in, or
to set SEARCH_INDEX accordingly. If you did not yet create the search
index, run this command:

    plm search init

Then try to restart Plume
"#
            ),
            e => Err(e).unwrap(),
        },
        Err(_) => panic!("Unexpected error while opening search index"),
        Ok(s) => Arc::new(s),
    };

    let commiter = searcher.clone();
    workpool.execute_with_fixed_delay(
        Duration::from_secs(5),
        Duration::from_secs(60 * 30),
        move || commiter.commit(),
    );

    let search_unlocker = searcher.clone();
    ctrlc::set_handler(move || {
        search_unlocker.commit();
        search_unlocker.drop_writer();
        exit(0);
    })
    .expect("Error setting Ctrl-c handler");

    let mail = mail::init();
    if mail.is_none() && CONFIG.rocket.as_ref().unwrap().environment.is_prod() {
        println!("Warning: the email server is not configured (or not completely).");
        println!("Please refer to the documentation to see how to configure it.");
    }

    let rocket = rocket::custom(CONFIG.rocket.clone().unwrap())
        .mount(
            "/",
            routes![
                routes::blogs::details,
                routes::blogs::activity_details,
                routes::blogs::outbox,
                routes::blogs::outbox_page,
                routes::blogs::new,
                routes::blogs::new_auth,
                routes::blogs::create,
                routes::blogs::delete,
                routes::blogs::edit,
                routes::blogs::update,
                routes::blogs::atom_feed,
                routes::comments::create,
                routes::comments::delete,
                routes::comments::activity_pub,
                routes::instance::index,
                routes::instance::admin,
                routes::instance::admin_mod,
                routes::instance::admin_instances,
                routes::instance::admin_users,
                routes::instance::admin_email_blocklist,
                routes::instance::add_email_blocklist,
                routes::instance::delete_email_blocklist,
                routes::instance::edit_users,
                routes::instance::toggle_block,
                routes::instance::update_settings,
                routes::instance::shared_inbox,
                routes::instance::interact,
                routes::instance::nodeinfo,
                routes::instance::about,
                routes::instance::privacy,
                routes::instance::web_manifest,
                routes::likes::create,
                routes::likes::create_auth,
                routes::medias::list,
                routes::medias::new,
                routes::medias::upload,
                routes::medias::details,
                routes::medias::delete,
                routes::medias::set_avatar,
                routes::notifications::notifications,
                routes::notifications::notifications_auth,
                routes::posts::details,
                routes::posts::activity_details,
                routes::posts::edit,
                routes::posts::update,
                routes::posts::new,
                routes::posts::new_auth,
                routes::posts::create,
                routes::posts::delete,
                routes::posts::remote_interact,
                routes::posts::remote_interact_post,
                routes::reshares::create,
                routes::reshares::create_auth,
                routes::search::search,
                routes::session::new,
                routes::session::create,
                routes::session::delete,
                routes::session::password_reset_request_form,
                routes::session::password_reset_request,
                routes::session::password_reset_form,
                routes::session::password_reset,
                routes::theme_files,
                routes::plume_static_files,
                routes::static_files,
                routes::plume_media_files,
                routes::tags::tag,
                routes::timelines::details,
                routes::timelines::new,
                routes::timelines::create,
                routes::timelines::edit,
                routes::timelines::update,
                routes::timelines::delete,
                routes::user::me,
                routes::user::details,
                routes::user::dashboard,
                routes::user::dashboard_auth,
                routes::user::followers,
                routes::user::followed,
                routes::user::edit,
                routes::user::edit_auth,
                routes::user::update,
                routes::user::delete,
                routes::user::follow,
                routes::user::follow_not_connected,
                routes::user::follow_auth,
                routes::user::activity_details,
                routes::user::outbox,
                routes::user::outbox_page,
                routes::user::inbox,
                routes::user::ap_followers,
                routes::user::new,
                routes::user::create,
                routes::user::atom_feed,
                routes::well_known::host_meta,
                routes::well_known::nodeinfo,
                routes::well_known::webfinger,
                routes::errors::csrf_violation
            ],
        )
        .mount(
            "/api/v1",
            routes![
                api::oauth,
                api::apps::create,
                api::posts::get,
                api::posts::list,
                api::posts::create,
                api::posts::delete,
            ],
        )
        .register(catchers![
            routes::errors::not_found,
            routes::errors::unprocessable_entity,
            routes::errors::server_error
        ])
        .manage(Arc::new(Mutex::new(mail)))
        .manage::<Arc<Mutex<Vec<routes::session::ResetRequest>>>>(Arc::new(Mutex::new(vec![])))
        .manage(dbpool)
        .manage(Arc::new(workpool))
        .manage(searcher)
        .manage(include_i18n!())
        .attach(
            CsrfFairingBuilder::new()
                .set_default_target(
                    "/csrf-violation?target=<uri>".to_owned(),
                    rocket::http::Method::Post,
                )
                .add_exceptions(vec![
                    ("/inbox".to_owned(), "/inbox".to_owned(), None),
                    (
                        "/@/<name>/inbox".to_owned(),
                        "/@/<name>/inbox".to_owned(),
                        None,
                    ),
                    ("/api/<path..>".to_owned(), "/api/<path..>".to_owned(), None),
                ])
                .finalize()
                .expect("main: csrf fairing creation error"),
        );

    #[cfg(feature = "test")]
    let rocket = rocket.mount("/test", routes![test_routes::health,]);
    rocket.launch();
}