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//! Traits, types, and implementations related to reading, writing, and
//! counting bytes.
#![allow(clippy::module_name_repetitions)]
#![allow(clippy::use_self)]

#[cfg(feature = "derive")]
#[allow(unused_imports)]
#[macro_use]
extern crate eosio_bytes_derive;

#[cfg(feature = "derive")]
#[doc(hidden)]
pub use eosio_bytes_derive::*;

mod impls;
mod num_bytes;
mod read;
mod write;

pub use self::{impls::*, num_bytes::*, read::*, write::*};

#[cfg(test)]
mod tests {
    use crate::*;

    macro_rules! test_type {
        ($($i:ident, $t:ty, $e:expr)*) => ($(
            #[test]
            fn $i() {
                let expected_pos = $e.num_bytes();
                let mut bytes = [0u8; 100];
                let thing: $t = $e;

                let mut write_pos = 0;
                thing.write(&mut bytes, &mut write_pos).unwrap();
                assert_eq!(expected_pos, write_pos);

                let mut read_pos = 0;
                let result = <$t as Read>::read(&bytes, &mut read_pos).unwrap();
                assert_eq!(expected_pos, read_pos);

                assert_eq!($e, result);
                assert_eq!(write_pos, read_pos);
            }
        )*)
    }

    test_type!(
        test_u8, u8, 1_u8
        test_u16, u16, 1_u16
        test_u32, u32, 1_u32
        test_u64, u64, 1_u64
        // test_i8, i8, 1i8
        test_i16, i16, -1_i16
        test_i32, i32, -1_i32
        test_i64, i64, -1_i64
        test_bool_true, bool, true
        test_bool_false, bool, false
        // test_option_none, Option<u8>, None as Option<u8>
        // test_option_some, Option<u8>, Some(1)
        test_string, String, "neat".to_string()
        test_vec, Vec<u8>, vec![1_u8, 2_u8, 3_u8]
        test_tuple2, (u8, u16), (1_u8, 2_u16)
        test_tuple3, (u8, u16, u32), (1_u8, 2_u16, 3_u32)
        test_tuple4, (u8, u16, u32, u64), (1_u8, 2_u16, 3_u32, 4_u64)
        test_array1, [u8; 1], [1u8; 1]
        test_array2, [u8; 2], [1u8; 2]
        test_array3, [u8; 3], [1u8; 3]
        test_array4, [u8; 4], [1u8; 4]
        test_array5, [u8; 5], [1u8; 5]
        test_array6, [u8; 6], [1u8; 6]
        test_array7, [u8; 7], [1u8; 7]
        test_array8, [u8; 8], [1u8; 8]
        test_array9, [u8; 9], [1u8; 9]
        test_array10, [u8; 10], [1u8; 10]
        test_array11, [u8; 11], [1u8; 11]
        test_array12, [u8; 12], [1u8; 12]
        test_array13, [u8; 13], [1u8; 13]
        test_array14, [u8; 14], [1u8; 14]
        test_array15, [u8; 15], [1u8; 15]
        test_array16, [u8; 16], [1u8; 16]
        test_array17, [u8; 17], [1u8; 17]
        test_array18, [u8; 18], [1u8; 18]
        test_array19, [u8; 19], [1u8; 19]
        test_array20, [u8; 20], [1u8; 20]
        test_f32, f32, -0.12345_f32
        test_f64, f64, -0.12345_f64
    );

    // #[test]
    // fn test_struct_named_fields() {
    //     #[derive(Read, Write, PartialEq, Debug)]
    //     struct Thing {
    //         a: u64,
    //         b: u64,
    //         c: u32,
    //     }

    //     let thing1 = Thing { a: 1, b: 2, c: 3 };

    //     let mut bytes = [0u8; 100];
    //     let mut write_pos = 0;
    //     thing1.write(&mut bytes, &mut write_pos).unwrap();
    //     assert_eq!(write_pos, 20);

    //     let mut read_pos = 0;
    //     let thing2 = Thing::read(&bytes, &mut read_pos).unwrap();
    //     assert_eq!(read_pos, write_pos);

    //     assert_eq!(thing1, thing2);
    //     assert_eq!(thing1.a, 1);
    //     assert_eq!(thing1.b, 2);
    //     assert_eq!(thing1.c, 3);
    // }

    // #[test]
    // fn test_struct_unnamed_fields() {
    //     #[derive(Read, Write, PartialEq, Debug)]
    //     struct Thing(u64, u64, u32);

    //     let thing1 = Thing(1, 2, 3);

    //     let mut bytes = [0u8; 100];

    //     let mut write_pos = 0;
    //     thing1.write(&mut bytes, &mut write_pos).unwrap();
    //     assert_eq!(write_pos, 20);

    //     let mut read_pos = 0;
    //     let thing2 = Thing::read(&bytes, &mut read_pos).unwrap();
    //     assert_eq!(read_pos, write_pos);

    //     assert_eq!(thing1, thing2);
    //     assert_eq!(thing1.0, 1);
    //     assert_eq!(thing1.1, 2);
    //     assert_eq!(thing1.2, 3);
    // }

    #[test]
    fn test_read_pos() {
        let bytes = &[
            10, 9, 0, 1, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 20, 4, 3, 2, 1, 1,
            1, 1, 1,
        ];

        let mut pos = 0;
        u8::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 1);

        u8::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 2);

        u16::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 4);

        u32::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 8);

        u64::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 16);

        u64::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 24);

        pos = 2;
        u64::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 10);

        pos = 10;
        u64::read(bytes, &mut pos).unwrap();
        assert_eq!(pos, 18);
    }

    #[test]
    fn test_write_pos() {
        let bytes = &mut [0u8; 1000];

        let mut pos = 0;
        1u8.write(bytes, &mut pos).unwrap();
        assert_eq!(pos, 1);

        1_u16.write(bytes, &mut pos).unwrap();
        assert_eq!(pos, 3);

        1_u32.write(bytes, &mut pos).unwrap();
        assert_eq!(pos, 7);

        1_u64.write(bytes, &mut pos).unwrap();
        assert_eq!(pos, 15);
    }

}