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use parking_lot::Mutex;
#[cfg(target_arch = "armv7")]
use rppal::gpio::{Error::InstanceExists, Gpio};
use std::io::{Error, ErrorKind};
use std::sync::Arc;

#[cfg(not(target_arch = "armv7"))]
pub type GpioArcMutex = Arc<Mutex<i32>>;

#[cfg(target_arch = "armv7")]
pub type GpioArcMutex = Arc<Mutex<Gpio>>;

#[cfg(not(target_arch = "armv7"))]
pub fn create_gpio_arc_mutex() -> Result<GpioArcMutex, String> {
    Ok(Arc::new(Mutex::new(0)))
}

#[cfg(target_arch = "armv7")]
pub fn create_gpio_arc_mutex() -> Result<GpioArcMutex, InstanceExists> {
    Arc::new(Mutex::new(Gpio::new()))?
}

#[cfg(not(target_arch = "armv7"))]
pub fn set_gpio_level_rpi(
    _gpio_num: i32,
    level: &str,
    gpio_arc_mutex: GpioArcMutex,
) -> Result<(), Error> {
    let mut data = gpio_arc_mutex.lock();
    match level {
        "high" => *data += 1,
        "low" => *data += 1,
        _ => {
            return Err(Error::new(
                ErrorKind::Other,
                format!("Invalid level: '{}'", level),
            ))
        }
    }
    Ok(())
}

#[cfg(target_arch = "armv7")]
pub fn set_gpio_level_rpi(
    gpio_num: i32,
    level: &str,
    gpio_arc_mutex: GpioArcMutex,
) -> Result<(), Error> {
    let gpio_instance = gpio_arc_mutex.lock();

    let mut gpio = gpio_instance.get(gpio_num)?.into_output();

    match level {
        "high" => gpio_instance.set_high(),
        "low" => gpio_instance.set_low(),
        _ => {
            return Err(Error::new(
                ErrorKind::Other,
                format!("Invalid level: '{}'", level),
            ))
        }
    }
    Ok(())
}