extern crate toml;
extern crate crossbeam;
extern crate discord;
extern crate rand;

use std::collections::BTreeMap;
use toml::Table;

mod modules;
use modules::Module;
use modules::loader::{ModuleLoader, ModuleLoaderError};

mod event;
use event::Event;

use std::sync::Arc;
use std::sync::mpsc;
use std::sync::mpsc::Sender;

mod helpers;

pub struct Tenquestionmarks {
    modules: BTreeMap<String, Box<Module>>
}

impl Tenquestionmarks {
    pub fn with_modules (modules: BTreeMap<String, Box<Module>>) -> Tenquestionmarks {
        let tqm = Tenquestionmarks {
            modules: modules
        };

        for (key, module) in &tqm.modules {
            module.register(&tqm);
        }

        tqm
    }

    pub fn from_configuration (configuration: Table) -> Result<Tenquestionmarks, ModuleLoaderError> {
        let loader = ModuleLoader::new();
        let modules = loader.load_from_configuration(configuration)?;
        Result::Ok(Tenquestionmarks::with_modules(modules))
    }

    pub fn run (&self) {
        crossbeam::scope(|scope| {
            // Our event channel.
            // Modules push events to tenquestionmarks using this channel.
            let (ref sender, ref receiver) = mpsc::channel();

            // Module event consumer threads.
            // tenquestionmarks propagates all events to each Module through these
            // channels.
            let senders: Vec<Sender<Event>> = self.modules.values().map(|module| {
                let (sender, receiver) = mpsc::channel();
                scope.spawn(move || module.consume_events(receiver));
                sender
            }).collect();

            // Module event producer threads.
            // Each Module will produce events which tenquestionmarks will push
            // into all other Modules.
            for module in self.modules.values() {
                let module_sender = sender.clone();
                scope.spawn(move || module.produce_events(module_sender));
            }

            // tenquestionmarks main event loop.
            // tenquestionmarks receives events produced by Modules and pushes them
            // into all other Modules
            loop {
                match receiver.recv() {
                    Ok(event) => {
                        for sender in &senders {
                            sender.send(event.clone());
                        }
                    },
                    Err(_) => {}
                }
            }
        });
    }
}

#[derive(Clone)]
pub struct Channel {
    name: String,
    description: String,
    topic: String,
    sender: Arc<MessageSender>
}

impl Channel {
    pub fn send (&self, message: &str) {
        self.sender.send_message(message);
    }
}

#[derive(Clone)]
pub struct User {
    name: String,
    sender: Arc<MessageSender>
}

impl User {
    pub fn send (&self, message: &str) {
        self.sender.send_message(message);
    }
}

pub trait MessageSender : Sync + Send {
    fn send_message (&self, message: &str) {}
}