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use esp8266_hal::gpio::*;
use esp8266_hal::target::GPIO;
use paste;

// This macro is a helper for defining a `Pins` type within a board support
// crate. This type is used to provide more meaningful aliases for the various
// GPIO pins for a given board.
macro_rules! define_pins {
    (
        $(
            $(#[$attr:meta])*
            pin $name:ident = ($pin_ident:ident, $pin_mode:ty)
        ),+ ,
    ) => {

paste::item! {
    /// Maps labelled pin names to their physical pins.
    pub struct Pins {
        $(
            $(#[$attr])*
            pub $name: [<$pin_ident:camel>]<$pin_mode>
        ),+
    }
}

impl Pins {
    /// Returns the pins for the device.
    pub fn new(gpio: GPIO) -> Self {
        let pins = gpio.split();

        Self {
            $( $name: pins.$pin_ident ),+
        }
    }
}

    };
}

define_pins!(
    /// Digital pin 0
    pin d0 = (gpio16, Input<Floating>),
    /// Digital pin 1, SCL
    pin d1 = (gpio5, Input<Floating>),
    /// Digital pin 2, SDA
    pin d2 = (gpio4, Input<Floating>),
    /// Digital pin 3 (10k pull-up)
    pin d3 = (gpio0, Input<Floating>),
    /// Digital pin 4 (10k pull-up), built-in LED
    pin d4 = (gpio2, Input<Floating>),
    /// Digital pin 5, SCK
    pin d5 = (gpio14, UnInitialized),
    /// Digital pin 6, MISO
    pin d6 = (gpio12, UnInitialized),
    /// Digital pin 7, MOSI, CTS
    pin d7 = (gpio13, UART),
    /// Digital pin 8 (10k pull-down), SS, RTS
    pin d8 = (gpio15, UART),

    /// UART receive pin
    pin rx = (gpio3, UART),
    /// UART transmit pin
    pin tx = (gpio1, UART),
);