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extern crate actix;
extern crate actix_web;
extern crate bytes;
extern crate clap;
extern crate flate2;
extern crate futures;
extern crate futures_cpupool;
extern crate prettytable;
extern crate sha1;
extern crate tar;

#[macro_use]
extern crate lazy_static;
extern crate env_logger;

pub mod cli;
pub mod files;
mod output;
mod run_once;

pub use clap::{App, Arg, ArgMatches, SubCommand};
use futures::{future, prelude::*};
use std::{any::Any, sync::Arc};

pub use output::{AutocompleteModule, LogModule};

pub trait Decorator: Clone + Sync + Send {
    fn decorate_webapp<S: 'static>(&self, app: actix_web::App<S>) -> actix_web::App<S>;

    fn extract<T: Module + Any>(&self) -> Option<&T>
    where
        Self: Sized;
}

pub trait Module: Any {
    fn args_declare<'a, 'b>(&self, app: App<'a, 'b>) -> App<'a, 'b> {
        app
    }

    #[inline]
    fn args_autocomplete<F>(&self, _matches: &ArgMatches, _app_gen: &F) -> bool
    where
        F: Fn() -> App<'static, 'static>,
    {
        false
    }

    fn args_consume(&mut self, _matches: &ArgMatches) -> bool {
        false
    }

    fn prepare(&mut self) -> Box<Future<Item = (), Error = ()>> {
        Box::new(future::ok(()))
    }

    fn run<D: Decorator + Clone + 'static>(&self, _decorator: D) {}

    fn decorate_webapp<S: 'static>(&self, app: actix_web::App<S>) -> actix_web::App<S> {
        app
    }

    fn extract<T: Module + Any>(&self) -> Option<&T>
    where
        Self: Sized,
    {
        Any::downcast_ref::<T>(self)
    }
}

impl<M: Module + Sync + Send> Decorator for Arc<M> {
    fn decorate_webapp<S: 'static>(&self, app: actix_web::App<S>) -> actix_web::App<S> {
        (**self).decorate_webapp(app)
    }

    fn extract<T: Module + Any>(&self) -> Option<&T>
    where
        Self: Sized,
    {
        (**self).extract()
    }
}

pub trait ModuleChain<M>
where
    M: Module,
{
    type Output: Module;

    fn chain(self, rhs: M) -> Self::Output;
}

impl<M1, M2> ModuleChain<M2> for M1
where
    M1: Module,
    M2: Module,
{
    type Output = ChainModule<M1, M2>;

    fn chain(self, rhs: M2) -> Self::Output {
        ChainModule { m1: self, m2: rhs }
    }
}

pub struct ChainModule<M1: Module, M2: Module> {
    m1: M1,
    m2: M2,
}

impl<M1, M2> Module for ChainModule<M1, M2>
where
    M1: Module,
    M2: Module,
{
    #[inline]
    fn args_declare<'a, 'b>(&self, app: App<'a, 'b>) -> App<'a, 'b> {
        let app = self.m1.args_declare(app);
        self.m2.args_declare(app)
    }

    #[inline]
    fn args_autocomplete<F>(&self, matches: &ArgMatches, app_gen: &F) -> bool
    where
        F: Fn() -> App<'static, 'static>,
    {
        if self.m1.args_autocomplete(matches, app_gen) {
            true
        } else {
            self.m2.args_autocomplete(matches, app_gen)
        }
    }

    fn args_consume(&mut self, matches: &ArgMatches) -> bool {
        let b1 = self.m1.args_consume(matches);
        let b2 = self.m2.args_consume(matches);

        b1 || b2
    }

    fn prepare(&mut self) -> Box<Future<Item = (), Error = ()>> {
        Box::new(self.m1.prepare().join(self.m2.prepare()).map(|(_, _)| ()))
    }

    fn run<D: Decorator + Clone + 'static>(&self, decorator: D) {
        self.m1.run(decorator.clone());
        self.m2.run(decorator);
    }

    #[inline]
    fn decorate_webapp<S: 'static>(&self, app: actix_web::App<S>) -> actix_web::App<S> {
        let app = self.m1.decorate_webapp(app);
        self.m2.decorate_webapp(app)
    }

    fn extract<T: Module + Any>(&self) -> Option<&T>
    where
        Self: Sized,
    {
        if let Some(v) = self.m1.extract() {
            return Some(v);
        }
        if let Some(v) = self.m2.extract() {
            return Some(v);
        }
        None
    }
}

pub struct GuApp<F>(pub F)
where
    F: Fn() -> App<'static, 'static>;

impl<F> GuApp<F>
where
    F: Fn() -> App<'static, 'static>,
{
    pub fn run<M: Module + 'static + Sync + Send>(&mut self, mut module: M) {
        let matches = module.args_declare(self.0()).get_matches();

        if !(module.args_autocomplete(&matches, &|| module.args_declare(self.0()))
            || module.args_consume(&matches))
        {
            eprintln!("{}", matches.usage());
        } else {
            let rcmod = Arc::new(module);
            rcmod.run(rcmod.clone())
        }
    }
}

pub use run_once::run_once;