/*
 * This file is part of espanso.
 *
 * Copyright (C) 2019-2021 Federico Terzi
 *
 * espanso is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * espanso is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
 */

use log::debug;

use self::{
    dispatch::Dispatcher,
    event::{Event, EventType, ExitMode},
    funnel::{Funnel, FunnelResult},
    process::Processor,
};

pub mod dispatch;
pub mod event;
pub mod funnel;
pub mod process;

pub struct Engine<'a> {
    funnel: &'a dyn Funnel,
    processor: &'a mut dyn Processor,
    dispatcher: &'a dyn Dispatcher,
}

impl<'a> Engine<'a> {
    pub fn new(
        funnel: &'a dyn Funnel,
        processor: &'a mut dyn Processor,
        dispatcher: &'a dyn Dispatcher,
    ) -> Self {
        Self {
            funnel,
            processor,
            dispatcher,
        }
    }

    pub fn run(&mut self) -> ExitMode {
        loop {
            match self.funnel.receive() {
                FunnelResult::Event(event) => {
                    let processed_events = self.processor.process(event);
                    for event in processed_events {
                        if let EventType::Exit(mode) = &event.etype {
                            debug!("exit event received with mode {mode:?}, exiting engine");
                            return mode.clone();
                        }

                        self.dispatcher.dispatch(event);
                    }
                }
                FunnelResult::EndOfStream => {
                    debug!("end of stream received");
                    return ExitMode::Exit;
                }
                FunnelResult::Skipped => {
                    // This event has been skipped, no need to handle it
                }
            }
        }
    }
}
