mirajazz 0.2.0

A library for interfacing with Mirabox and Ajazz stream controller devices
Documentation 
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use std::{
    iter::zip,
    sync::{Arc, Mutex},
    time::Duration,
};

use crate::{device::Device, error::MirajazzError, types::DeviceInput};

/// Tells what changed in button states
#[derive(Copy, Clone, Debug, Hash)]
pub enum DeviceStateUpdate {
    /// Button got pressed down
    ButtonDown(u8),

    /// Button got released
    ButtonUp(u8),

    /// Encoder got pressed down
    EncoderDown(u8),

    /// Encoder was released from being pressed down
    EncoderUp(u8),

    /// Encoder was twisted
    EncoderTwist(u8, i8),
}

#[derive(Default)]
pub struct DeviceState {
    /// Buttons include Touch Points state
    pub buttons: Vec<bool>,
    pub encoders: Vec<bool>,
}

/// Button reader that keeps state of the device and returns events instead of full states
pub struct DeviceStateReader {
    pub device: Arc<Device>,
    pub states: Mutex<DeviceState>,
}

impl DeviceStateReader {
    /// Reads states and returns updates
    pub fn read(
        &self,
        timeout: Option<Duration>,
        process_input: impl Fn(u8, u8) -> Result<DeviceInput, MirajazzError>,
        supports_both_states: bool,
    ) -> Result<Vec<DeviceStateUpdate>, MirajazzError> {
        let input = self.device.read_input(timeout, process_input)?;
        let mut my_states = self.states.lock()?;

        let mut updates = vec![];

        match input {
            DeviceInput::ButtonStateChange(buttons) => {
                for (index, (their, mine)) in
                    zip(buttons.iter(), my_states.buttons.iter()).enumerate()
                {
                    if !supports_both_states {
                        if *their {
                            updates.push(DeviceStateUpdate::ButtonDown(index as u8));
                            updates.push(DeviceStateUpdate::ButtonUp(index as u8));
                        }
                    } else if their != mine {
                        if *their {
                            updates.push(DeviceStateUpdate::ButtonDown(index as u8));
                        } else {
                            updates.push(DeviceStateUpdate::ButtonUp(index as u8));
                        }
                    }
                }

                my_states.buttons = buttons;
            }

            DeviceInput::EncoderStateChange(encoders) => {
                for (index, (their, mine)) in
                    zip(encoders.iter(), my_states.encoders.iter()).enumerate()
                {
                    if !supports_both_states {
                        if *their {
                            updates.push(DeviceStateUpdate::EncoderDown(index as u8));
                            updates.push(DeviceStateUpdate::EncoderUp(index as u8));
                        }
                    } else if *their != *mine {
                        if *their {
                            updates.push(DeviceStateUpdate::EncoderDown(index as u8));
                        } else {
                            updates.push(DeviceStateUpdate::EncoderUp(index as u8));
                        }
                    }
                }

                my_states.encoders = encoders;
            }

            DeviceInput::EncoderTwist(twist) => {
                for (index, change) in twist.iter().enumerate() {
                    if *change != 0 {
                        updates.push(DeviceStateUpdate::EncoderTwist(index as u8, *change));
                    }
                }
            }
            _ => {}
        }

        drop(my_states);

        Ok(updates)
    }
}