extern crate toml;
extern crate crossbeam;

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

mod plugins;
use plugins::Plugin;
use plugins::loader::{PluginLoader, PluginLoaderError};

mod event;
use event::Event;

use std::sync::mpsc;
use std::sync::mpsc::{Sender, Receiver};

pub struct Tenquestionmarks {
    plugins: BTreeMap<String, Box<Plugin>>
}

impl Tenquestionmarks {
    pub fn with_plugins (plugins: BTreeMap<String, Box<Plugin>>) -> Tenquestionmarks {
        let tqm = Tenquestionmarks {
            plugins: plugins
        };

        for (key, plugin) in &tqm.plugins {
            plugin.register(&tqm);
        }

        tqm
    }

    pub fn from_configuration (configuration: Table) -> Result<Tenquestionmarks, PluginLoaderError> {
        let loader = PluginLoader::new();
        let plugins = loader.load_from_configuration(configuration)?;
        Result::Ok(Tenquestionmarks::with_plugins(plugins))
    }

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

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

            // Plugin event producer threads.
            // Each plugin will produce events which tenquestionmarks will push
            // into all other plugins.
            for plugin in self.plugins.values() {
                let plugin_sender = sender.clone();
                scope.spawn(move || plugin.produce_events(plugin_sender));
            }

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

#[derive(Debug, Clone)]
pub struct Channel {
    name: String,
    description: String,
    topic: String
}

#[derive(Debug, Clone)]
pub struct User {
    name: String
}