use deku::prelude::*;

#[derive(DekuRead, DekuWrite)]
struct TestCount {
    field_a: u8,
    #[deku(count = "deku::byte_offset")]
    field_b: Vec<u8>,
}

#[derive(DekuRead, DekuWrite)]
struct TestBitRead {
    field_a: u8,
    #[deku(bits_read = "deku::bit_offset")]
    field_b: Vec<u8>,
}

#[derive(DekuRead, DekuWrite)]
struct TestBytesRead {
    field_a: u8,
    #[deku(bytes_read = "deku::bit_offset")]
    field_b: Vec<u8>,
}

#[derive(DekuRead, DekuWrite)]
struct TestUntil {
    field_a: u8,
    #[deku(until = "|v| *v as usize == deku::bit_offset")]
    field_b: Vec<u8>,
}

#[derive(DekuRead, DekuWrite)]
struct TestCond {
    field_a: u8,
    #[deku(cond = "deku::bit_offset == *field_a as usize")]
    field_b: u8,
}

#[derive(DekuRead, DekuWrite)]
struct TestDefault {
    field_a: u8,
    #[deku(skip, default = "deku::byte_offset")]
    field_b: usize,
}

#[derive(DekuRead, DekuWrite)]
struct TestMap {
    field_a: u8,
    #[deku(map = "|v: u8| -> Result<_, DekuError> { Ok(v as usize + deku::byte_offset) }")]
    field_b: usize,
}

fn dummy_reader<R: std::io::Read + std::io::Seek>(
    offset: usize,
    _reader: &mut Reader<R>,
) -> Result<usize, DekuError> {
    Ok(0)
}
#[derive(DekuRead, DekuWrite)]
struct TestReader {
    field_a: u8,
    #[deku(reader = "dummy_reader(deku::byte_offset, deku::reader)")]
    field_b: usize,
}

#[derive(DekuRead, DekuWrite)]
#[deku(ctx = "_byte_size: usize, _bit_size: usize")]
struct ChildCtx {}
#[derive(DekuRead, DekuWrite)]
struct TestCtx {
    field_a: u8,
    #[deku(ctx = "deku::byte_offset, deku::bit_offset")]
    field_b: ChildCtx,
}

fn dummy_writer<W: std::io::Write>(_offset: usize, _writer: &mut deku::writer::Writer<W>) -> Result<(), DekuError> {
    Ok(())
}
#[derive(DekuRead, DekuWrite)]
struct TestWriter {
    field_a: u8,
    #[deku(writer = "dummy_writer(deku::byte_offset, deku::writer)")]
    field_b: usize,
}

#[derive(DekuRead, DekuWrite)]
struct FailInternal {
    field_a: u8,
    #[deku(cond = "__deku_bit_offset == *field_a as usize")]
    field_b: u8,
}

fn main() {}