// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd

use googletest::prelude::*;
use paste::paste;
use protobuf::{proto, AsMut, AsView, Repeated};
use unittest_rust_proto::{test_all_types, test_all_types::NestedMessage, TestAllTypes};

macro_rules! generate_repeated_numeric_test {
  ($(($t: ty, $field: ident)),*) => {
      paste! { $(
          #[gtest]
          fn [< test_repeated_ $field _accessors >]() {
              let mut msg = TestAllTypes::new();
              assert_that!(msg.[< repeated_ $field >](), is_empty());
              assert_that!(msg.[< repeated_ $field >]().len(), eq(0));
              assert_that!(msg.[<repeated_ $field >]().get(0), none());

              let mut mutator = msg.[<repeated_ $field _mut >]();
              mutator.push(1 as $t);
              assert_that!(mutator.len(), eq(1));
              assert_that!(mutator.iter().len(), eq(1));
              assert_that!(mutator.get(0), some(eq(1 as $t)));
              mutator.set(0, 2 as $t);
              assert_that!(mutator.get(0), some(eq(2 as $t)));
              mutator.push(1 as $t);

              mutator.push(3 as $t);
              mutator.set(2, 4 as $t);
              assert_that!(mutator.get(2), some(eq(4 as $t)));
              mutator.set(2, 0 as $t);

              assert_that!(
                mutator,
                elements_are![eq(2 as $t), eq(1 as $t), eq(0 as $t)]
              );
              assert_that!(
                mutator.as_view(),
                elements_are![eq(2 as $t), eq(1 as $t), eq(0 as $t)]
              );

              for i in 0..mutator.len() {
                  mutator.set(i, 0 as $t);
              }
              assert_that!(
                msg.[<repeated_ $field _mut >](),
                each(eq(0 as $t))
              );
          }

          #[gtest]
          fn [< test_repeated_ $field _set >]() {
              let mut msg = TestAllTypes::new();
              let mut msg2 = TestAllTypes::new();
              let mut mutator2 = msg2.[<repeated_ $field _mut>]();
              for i in 0..5 {
                  mutator2.push(i as $t);
              }

              msg.[<set_repeated_ $field >](mutator2.as_view());

              let view = msg.[<repeated_ $field>]();
              assert_that!(
                view.iter().collect::<Vec<_>>(),
                eq(&mutator2.iter().collect::<Vec<_>>())
              );
          }

          #[gtest]
          fn [< test_repeated_ $field _exact_size_iterator >]() {
            let mut msg = TestAllTypes::new();
            let mut mutator = msg.[<repeated_ $field _mut>]();
            for i in 0..5 {
                mutator.push(i as $t);
            }
            let mut iter = mutator.iter();
            // size_hint/len must indicate the _remaining_ items in the iterator.
            for i in 0..5 {
                assert_that!(iter.len(), eq(5 - i));
                assert_that!(iter.size_hint(), eq((5 - i, Some(5 - i))));
                assert_that!(iter.next(), eq(Some(i as $t)));
            }
            assert_that!(iter.size_hint(), eq((0, Some(0))));
            assert_that!(iter.len(), eq(0));
            assert_that!(iter.next(), eq(None));

            // Also check FusedIterator - calling `next` multiple times should return `None`.
            assert_that!(iter.next(), eq(None));
          }
      )* }
  };
}

generate_repeated_numeric_test!(
    (i32, int32),
    (u32, uint32),
    (i64, int64),
    (u64, uint64),
    (f32, float),
    (f64, double)
);

#[gtest]
fn test_repeated_bool_accessors() {
    let mut msg = TestAllTypes::new();
    assert_that!(msg.repeated_bool(), is_empty());
    assert_that!(msg.repeated_bool().len(), eq(0));
    assert_that!(msg.repeated_bool().get(0), none());

    let mut mutator = msg.repeated_bool_mut();
    mutator.push(true);
    assert_that!(mutator.len(), eq(1));
    assert_that!(mutator.get(0), some(eq(true)));
    mutator.set(0, false);
    assert_that!(mutator.get(0), some(eq(false)));
    mutator.push(true);

    mutator.push(false);
    mutator.set(2, true);
    assert_that!(mutator.get(2), some(eq(true)));
    mutator.set(2, false);
    assert_that!(mutator.get(2), some(eq(false)));

    assert_that!(mutator, elements_are![eq(false), eq(true), eq(false)]);
    assert_that!(mutator.as_view(), elements_are![eq(false), eq(true), eq(false)]);

    for i in 0..mutator.len() {
        mutator.set(i, false);
    }
    assert_that!(msg.repeated_bool(), each(eq(false)));
}

#[gtest]
fn test_repeated_enum_accessors() {
    use test_all_types::NestedEnum;

    let mut msg = TestAllTypes::new();
    assert_that!(msg.repeated_nested_enum(), is_empty());
    assert_that!(msg.repeated_nested_enum().len(), eq(0));
    assert_that!(msg.repeated_nested_enum().get(0), none());

    let mut mutator = msg.repeated_nested_enum_mut();
    mutator.push(NestedEnum::Foo);
    assert_that!(mutator.len(), eq(1));
    assert_that!(mutator.get(0), some(eq(NestedEnum::Foo)));
    mutator.set(0, NestedEnum::Bar);
    assert_that!(mutator.get(0), some(eq(NestedEnum::Bar)));
    mutator.push(NestedEnum::Baz);

    mutator.push(NestedEnum::Foo);
    mutator.set(2, NestedEnum::Neg);
    assert_that!(mutator.get(2), some(eq(NestedEnum::Neg)));
    mutator.set(2, NestedEnum::Foo);
    assert_that!(mutator.get(2), some(eq(NestedEnum::Foo)));

    assert_that!(
        mutator,
        elements_are![eq(NestedEnum::Bar), eq(NestedEnum::Baz), eq(NestedEnum::Foo)]
    );
    assert_that!(
        mutator.as_view(),
        elements_are![eq(NestedEnum::Bar), eq(NestedEnum::Baz), eq(NestedEnum::Foo)]
    );

    for i in 0..mutator.len() {
        mutator.set(i, NestedEnum::Foo);
    }
    assert_that!(msg.repeated_nested_enum(), each(eq(NestedEnum::Foo)));
}

#[gtest]
fn test_repeated_enum_set() {
    use test_all_types::NestedEnum;

    let mut msg = TestAllTypes::new();
    msg.set_repeated_nested_enum([NestedEnum::Foo, NestedEnum::Bar, NestedEnum::Baz].into_iter());
    assert_that!(
        msg.repeated_nested_enum(),
        elements_are![eq(NestedEnum::Foo), eq(NestedEnum::Bar), eq(NestedEnum::Baz)]
    );
}

#[gtest]
fn test_repeated_bool_set() {
    let mut msg = TestAllTypes::new();
    let mut msg2 = TestAllTypes::new();
    let mut mutator2 = msg2.repeated_bool_mut();
    for _ in 0..5 {
        mutator2.push(true);
    }

    msg.set_repeated_bool(mutator2.as_view());

    let view = msg.repeated_bool();
    assert_that!(&view.iter().collect::<Vec<_>>(), eq(&mutator2.iter().collect::<Vec<_>>()));
}

#[gtest]
fn test_repeated_message() {
    let mut msg = TestAllTypes::new();
    assert_that!(msg.repeated_nested_message().len(), eq(0));
    let mut nested = NestedMessage::new();
    nested.set_bb(1);
    msg.repeated_nested_message_mut().push(nested);
    assert_that!(msg.repeated_nested_message().get(0).unwrap().bb(), eq(1));

    let mut msg2 = TestAllTypes::new();
    for _i in 0..2 {
        msg2.repeated_nested_message_mut().push(NestedMessage::new());
    }
    assert_that!(msg2.repeated_nested_message().len(), eq(2));

    msg2.repeated_nested_message_mut().copy_from(msg.repeated_nested_message());
    assert_that!(msg2.repeated_nested_message().len(), eq(1));
    assert_that!(msg2.repeated_nested_message().get(0).unwrap().bb(), eq(1));

    let mut nested2 = NestedMessage::new();
    nested2.set_bb(2);

    msg.repeated_nested_message_mut().set(0, nested2);
    assert_that!(msg.repeated_nested_message().get(0).unwrap().bb(), eq(2));

    assert_that!(
        msg.repeated_nested_message(),
        elements_are![predicate(|m: protobuf::View<NestedMessage>| m.bb() == 2)],
    );

    msg.repeated_nested_message_mut().get_mut(0).unwrap().set_bb(3);
    assert_that!(
        msg.repeated_nested_message(),
        elements_are![predicate(|m: protobuf::View<NestedMessage>| m.bb() == 3)],
    );

    drop(msg);

    assert_that!(msg2.repeated_nested_message().get(0).unwrap().bb(), eq(1));
    msg2.repeated_nested_message_mut().clear();
    assert_that!(msg2.repeated_nested_message().len(), eq(0));
}

#[gtest]
fn test_repeated_message_setter() {
    let mut msg = TestAllTypes::new();
    let mut nested = NestedMessage::new();
    nested.set_bb(1);
    msg.set_repeated_nested_message([nested].into_iter());
    assert_that!(msg.repeated_nested_message().get(0).unwrap().bb(), eq(1));
}

#[gtest]
fn test_empty_repeated_message_drop() {
    let _ = Repeated::<TestAllTypes>::new();
}

#[gtest]
fn test_repeated_message_drop() {
    let mut repeated = Repeated::<TestAllTypes>::new();
    repeated.as_mut().push(TestAllTypes::new());

    {
        let v: Vec<TestAllTypes> = vec![proto!(TestAllTypes { optional_int32: 1 })];
        repeated.as_mut().extend(v.iter().cloned());
    }
}

#[gtest]
fn test_repeated_strings() {
    let mut older_msg = TestAllTypes::new();
    {
        let mut msg = TestAllTypes::new();
        assert_that!(msg.repeated_string(), is_empty());
        {
            let s = String::from("set from Mut");
            msg.repeated_string_mut().push(s);
        }
        msg.repeated_string_mut().push("second str");
        {
            let s2 = String::from("set second str");
            msg.repeated_string_mut().set(1, s2);
        }
        assert_that!(msg.repeated_string().len(), eq(2));
        assert_that!(msg.repeated_string().get(0).unwrap(), eq("set from Mut"));
        assert_that!(msg.repeated_string().get(1).unwrap(), eq("set second str"));
        assert_that!(
            msg.repeated_string(),
            elements_are![eq("set from Mut"), eq("set second str")]
        );
        older_msg.repeated_string_mut().copy_from(msg.repeated_string());
    }

    assert_that!(older_msg.repeated_string().len(), eq(2));
    assert_that!(
        older_msg.repeated_string(),
        elements_are![eq("set from Mut"), eq("set second str")]
    );

    older_msg.repeated_string_mut().clear();
    assert_that!(older_msg.repeated_string(), is_empty());
}

#[gtest]
fn test_repeated_bytes() {
    let mut older_msg = TestAllTypes::new();
    {
        let mut msg = TestAllTypes::new();
        assert_that!(msg.repeated_bytes(), is_empty());
        {
            let s = Vec::from(b"set from Mut");
            msg.repeated_bytes_mut().push(s);
        }
        msg.repeated_bytes_mut().push(b"second bytes");
        {
            let s2 = Vec::from(b"set second bytes");
            msg.repeated_bytes_mut().set(1, s2);
        }
        assert_that!(msg.repeated_bytes().len(), eq(2));
        assert_that!(msg.repeated_bytes().get(0).unwrap(), eq(b"set from Mut"));
        assert_that!(msg.repeated_bytes().get(1).unwrap(), eq(b"set second bytes"));
        assert_that!(
            msg.repeated_bytes().iter().collect::<Vec<_>>(),
            elements_are![eq(b"set from Mut"), eq(b"set second bytes")]
        );
        older_msg.repeated_bytes_mut().copy_from(msg.repeated_bytes());
    }

    assert_that!(older_msg.repeated_bytes().len(), eq(2));
    assert_that!(older_msg.repeated_bytes().get(0).unwrap(), eq(b"set from Mut"));
    assert_that!(older_msg.repeated_bytes().get(1).unwrap(), eq(b"set second bytes"));
    assert_that!(
        older_msg.repeated_bytes().iter().collect::<Vec<_>>(),
        elements_are![eq(b"set from Mut"), eq(b"set second bytes")]
    );

    older_msg.repeated_bytes_mut().clear();
    assert_that!(older_msg.repeated_bytes(), is_empty());
}
