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use alloc::fmt;

macro_rules! impl_unit_display {
    ($Type:ident) => {
        impl fmt::Display for $Type {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                write!(f, "{}", self.0)
            }
        }
    };
}

macro_rules! impl_unit_anon_display {
    ($Type:ident) => {
        impl fmt::Display for $Type<'_> {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                write!(f, "{}", self.0)
            }
        }
    };
}

macro_rules! impl_enum_anon_display {
    ($Type:ident, $($Tag:ident),*) => {
        impl fmt::Display for $Type<'_> {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                match self {
                    $(
                        $Type::$Tag(data) => write!(f, "{}", data),
                    )*
                }
            }
        }
    };
}

macro_rules! parser {
    ($(#[$outer:meta])* $Type:ident, $parser:expr) => {
        impl<'a, E: Error<'a>> Parse<'a, E> for $Type<'a> {
            $(#[$outer])*
            fn parse(x: &'a [u8]) -> Result<Self, E> {
                $parser(x)
            }
        }
    };
}

macro_rules! parser_no_lifetime {
    ($(#[$outer:meta])* $Type:ident, $parser:expr) => {
        impl<'a, E: Error<'a>> Parse<'a, E> for $Type {
            $(#[$outer])*
            fn parse(x: &'a [u8]) -> Result<Self, E> {
                $parser(x)
            }
        }
    };
}

macro_rules! unit_parser {
    ($(#[$outer:meta])* $name:ident, $parser:expr) => {
        $(#[$outer])*
        pub fn $name<'a, E: Error<'a>>(x: &'a [u8]) -> Result<(), E> {
            $parser(x)
        }
    }
}

macro_rules! slice_parser {
    ($(#[$outer:meta])* $name:ident, $parser:expr) => {
        $(#[$outer])*
        pub fn $name<'a, E: Error<'a>>(x: &'a [u8]) -> Result<&'a[u8], E> {
            $parser(x)
        }
    }
}

pub(crate) fn fmt_list<T: fmt::Display>(
    f: &mut fmt::Formatter,
    sep: &'static str,
    args: &[T],
) -> fmt::Result {
    if args.is_empty() {
        return Ok(());
    }

    let mut args = args.iter();
    write!(f, "{}", args.next().unwrap())?;
    for arg in args {
        write!(f, "{}{}", sep, arg)?;
    }
    Ok(())
}