use std::collections::HashMap;
use std::cell::RefCell;
use sdl2::haptic::Haptic;
use sdl2::HapticSubsystem;
pub use sdl2::GameControllerSubsystem;
use sdl2::event::Event;
use sdl2::controller::GameController;
use std::rc::Rc;

//#[derive(Debug)]
pub struct ControllerManager {
    pub ctrl: GameControllerSubsystem,
    haptic: Rc<HapticSubsystem>,
    pub controllers: HashMap<u32, Rc<RefCell<Controller>>>,
}

//#[derive(Debug)]
pub struct Controller {
    pub ctrl: GameController,
    haptic: Option<Rc<RefCell<Haptic>>>,
}

impl ControllerManager {
    pub fn new(ctrl: GameControllerSubsystem, haptic: HapticSubsystem) -> Self {
	let mut c = ControllerManager {
	    ctrl,
	    haptic: Rc::new(haptic),
	    controllers: HashMap::new(),
	};
	c.init();
	c
    }

    fn init(&mut self) {
	for i in 0..self.ctrl.num_joysticks().unwrap() {
	    self.add_device(i);
	}
    }

    pub fn handle_event(&mut self, event: &Event) {
	match event {
	    Event::ControllerDeviceAdded { which, .. } => { self.add_device(*which) }
	    Event::ControllerDeviceRemoved { which, .. } => { self.remove_device(*which) }
	    Event::ControllerDeviceRemapped { which, .. } => { println!("device remapped ({})!", *which) }
	    Event::ControllerButtonDown { button, .. } => { println!("button {} down!", button.string()) }
	    Event::ControllerButtonUp { button, .. } => { println!("button {} up!", button.string()) }
	    Event::ControllerAxisMotion { axis, .. } => { println!("axis motion {}!", axis.string()) }
	    _ => {}
	}
    }

    pub fn add_device(&mut self, id: u32) {
	println!("device added ({})!", id);
	let mut ctrl = self.ctrl.open(id).unwrap();
	println!("opened {}", ctrl.name());

	/*
	note about set_rumble (for dualshock 3 at least):
	the active range for the low frequency is from 65536/4 to 65536 and escalates in large steps throughout the range
	the active range for the high frequency is from 256 to 65536 and effect is the same throughout the whole range
	 */
	let haptic = match ctrl.set_rumble(0, 256, 100) {
	    Ok(_) => self.haptic.open_from_joystick_id(id).ok(),
	    Err(_) => None
	};

	if self.controllers.contains_key(&id) {
	    return;
	}

	let detached = self.controllers.values().find(|c| !c.borrow().ctrl.attached());
	match detached {
	    Some(c) => {
		let mut c = c.borrow_mut();
		c.ctrl = ctrl;
		c.haptic = haptic.map(|h| Rc::new(RefCell::new(h)));
	    }
	    None => {
		let c = Rc::new(RefCell::new(Controller {ctrl, haptic: haptic.map(|h| Rc::new(RefCell::new(h)))}));
		self.controllers.insert(id, c);
	    }
	};
    }

    pub fn remove_device(&mut self, id: i32) {
	println!("device removed ({})!", id);
	// TODO
    }
}

impl Controller {
    /// strength [0 - 1]
    pub fn rumble(&self, strength: f32, duration_ms: u32) {
	if let Some(h) = &self.haptic {
	    h.borrow_mut().rumble_play(strength, duration_ms);
	}
    }
}