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//! Gamepad utility functions.
//!
//! This is going to be a bit of a work-in-progress as gamepad input
//! gets fleshed out.  The `gilrs` crate needs help to add better
//! cross-platform support.  Why not give it a hand?
#![cfg(feature = "gamepad")]

use gilrs::ConnectedGamepadsIterator;
use std::fmt;

pub use gilrs::{self, Event, Gamepad, Gilrs};

/// A unique identifier for a particular GamePad
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub struct GamepadId(pub(crate) gilrs::GamepadId);

use crate::context::Context;
use crate::error::GameResult;

/// A structure that contains gamepad state using `gilrs`.
pub struct GamepadContext {
    pub(crate) gilrs: Gilrs,
}

impl fmt::Debug for GamepadContext {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "<GilrsGamepadContext: {:p}>", self)
    }
}

impl GamepadContext {
    pub(crate) fn new() -> GameResult<Self> {
        let gilrs = Gilrs::new()?;
        Ok(GamepadContext { gilrs })
    }
}

impl From<Gilrs> for GamepadContext {
    /// Converts from a `Gilrs` custom instance to a `GilrsGamepadContext`
    fn from(gilrs: Gilrs) -> Self {
        Self { gilrs }
    }
}

impl GamepadContext {
    /// Returns a gamepad event.
    pub fn next_event(&mut self) -> Option<Event> {
        self.gilrs.next_event()
    }

    /// Returns the `Gamepad` associated with an `id`.
    pub fn gamepad(&self, id: GamepadId) -> Gamepad {
        self.gilrs.gamepad(id.0)
    }

    /// Return an iterator of all the `Gamepads` that are connected.
    pub fn gamepads(&self) -> GamepadsIterator {
        GamepadsIterator {
            wrapped: self.gilrs.gamepads(),
        }
    }
}

/// An iterator of the connected gamepads
pub struct GamepadsIterator<'a> {
    wrapped: ConnectedGamepadsIterator<'a>,
}

impl<'a> fmt::Debug for GamepadsIterator<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "<GamepadsIterator: {:p}>", self)
    }
}

impl<'a> Iterator for GamepadsIterator<'a> {
    type Item = (GamepadId, Gamepad<'a>);

    fn next(&mut self) -> Option<(GamepadId, Gamepad<'a>)> {
        self.wrapped.next().map(|(id, gp)| (GamepadId(id), gp))
    }
}

/// Returns the `Gamepad` associated with an `id`.
#[deprecated(since = "0.8.0", note = "Use `ctx.gamepad.gamepad` instead")]
pub fn gamepad(ctx: &Context, id: GamepadId) -> Gamepad {
    ctx.gamepad.gamepad(id)
}

/// Return an iterator of all the `Gamepads` that are connected.
#[deprecated(since = "0.8.0", note = "Use `ctx.gamepad.gamepads` instead")]
pub fn gamepads(ctx: &Context) -> GamepadsIterator {
    ctx.gamepad.gamepads()
}

// Properties gamepads might want:
// Number of buttons
// Number of axes
// Name/ID
// Is it connected?  (For consoles?)
// Whether or not they support vibration

/*
/// Lists all gamepads.  With metainfo, maybe?
pub fn list_gamepads() {
    unimplemented!()
}

/// Returns the state of the given axis on a gamepad.
pub fn axis() {
    unimplemented!()
}

/// Returns the state of the given button on a gamepad.
pub fn button_pressed() {
    unimplemented!()
}
*/

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn gilrs_init() {
        assert!(GamepadContext::new().is_ok());
    }
}