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#![feature(decl_macro, never_type, plugin, proc_macro_hygiene, try_from)]

#[macro_use]
pub extern crate bson;

extern crate base64;
extern crate bcrypt;
#[macro_use]
extern crate error_chain;
extern crate jsonwebtoken;
extern crate mongodb;
#[macro_use]
extern crate parker_codegen;
extern crate pulldown_cmark;
#[macro_use]
extern crate rocket;
extern crate rocket_contrib;
#[macro_use]
extern crate serde;

// Re-export macros
pub use bson::{bson, doc};
pub use mongodb::coll::options::FindOptions;

use std::{collections::HashMap as Map, convert::TryFrom};

use mongodb::db::Database;
use rocket::{fairing::AdHoc, routes, Config as RocketConfig, Rocket};
use rocket_contrib::{serve::StaticFiles, templates::Template};

// Local modules
mod config;
mod doc;
mod error;
mod jwt;
mod merge;
mod query;
mod render;
mod routes;
mod user;
mod view;
mod views;
mod webpage;

pub use crate::{query::Query, view::View};

use crate::{
    config::ParkerConfig, error::Result, jwt::JwtHandler, user::UserRolesToken,
    views::Views,
};

#[derive(Default)]
pub struct Parker {
    views: Map<String, View>,
}

impl Parker {
    pub fn new() -> Self {
        Self::default()
    }

    pub fn view(mut self, name: &str, view: View) -> Self {
        self.views.insert(name.to_string(), view);
        self
    }

    pub fn launch(self) {
        // Configure Rocket and start the server
        rocket::ignite()
            // Fairings for additional functionality
            .attach(Template::custom(render::init_template_engines))
            .attach(AdHoc::on_attach("Parker Initialization", |rocket| {
                // Initialize all required objects. If any error occurs, this
                // will fail and scrub the launch.
                match InitObject::init(self, rocket.config()) {
                    Ok(init_obj) => Ok(init_obj.apply(rocket)),
                    Err(_) => {
                        // TODO log error here
                        Err(rocket)
                    }
                }
            }))
            // Routes that don't require configuration
            .mount(
                "/",
                routes![
                    routes::index_get,
                    routes::page_get,
                    routes::page_post,
                    routes::user_post,
                    routes::login_post,
                    routes::logout_post
                ],
            )
            // Up, up, and away!!
            .launch();
    }
}

/// A container for all of the objects that will be passed to Rocket during
/// init. These are kept together so that they can all be created in one
/// function to consolidate failures.
struct InitObject {
    db: Database,
    views: Views,
    roles_jwt: JwtHandler<UserRolesToken>,
    static_files: StaticFiles,
}

impl InitObject {
    /// Create all the components needed for initialization. First,all necessary
    /// data is loaded from the Rocket config. If any data is missing or the
    /// incorrect type, this will fail. Then, each required object is
    /// constructed.
    ///
    /// # Errors
    /// * If the Rocket config is missing key(s) or has incorrect type(s)
    /// * If an error occurs during any object initialization
    fn init(parker: Parker, cfg: &RocketConfig) -> Result<Self> {
        let parker_cfg = ParkerConfig::try_from(cfg)?;
        let db = Database::try_from(&parker_cfg)?;
        let views = Views::new(db.clone(), parker.views);
        let roles_jwt = JwtHandler::try_from(&parker_cfg)?;
        Ok(Self {
            db,
            views,
            roles_jwt,
            static_files: StaticFiles::from(&parker_cfg.static_dir),
        })
    }

    /// Adds all components in this struct to the given Rocket instance.
    fn apply(self, rocket: Rocket) -> Rocket {
        rocket
            .manage(self.db)
            .manage(self.views)
            .manage(self.roles_jwt)
            .mount("/static", self.static_files)
    }
}