/*!
 * \file span.cpp
 * \brief
 *      Unit tests for span
 *
 * \copyright Copyright (C) 2020 Christos Choutouridis <christos@choutouridis.net>
 *
 * <dl class=\"section copyright\"><dt>License</dt><dd>
 * The MIT License (MIT)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * </dd></dl>
 *
 */
#include <cont/span.h>
#include <gtest/gtest.h>

#include <cont/deque.h>
#include <vector>
#include <type_traits>

// tests from https://github.com/tcbrindle/span/blob/master/test/test_span.cpp

namespace test_span {
   using namespace tbx;

   TEST (Tspan, default_constructors) {
       EXPECT_EQ (true, ( std::is_nothrow_default_constructible<span<int>>::value));
       EXPECT_EQ (true, ( std::is_nothrow_default_constructible<span<int, 0>>::value));
       EXPECT_EQ (true, (!std::is_nothrow_default_constructible<span<int, 42>>::value));

       constexpr span<int> s1{};

       EXPECT_EQ (0UL, s1.size());
       EXPECT_EQ (nullptr, s1.data());
       EXPECT_EQ (s1.begin(), s1.end());

       constexpr span<int, 0> s2{};

       EXPECT_EQ (0UL, s2.size());
       EXPECT_EQ (nullptr, s2.data());
       EXPECT_EQ (s2.begin(), s2.end());
   }

   TEST (Tspan, pointer_constructors) {
       // pointer length
       EXPECT_EQ (true, (std::is_constructible<span<int>, int*, int>::value));
       EXPECT_EQ (true, (std::is_constructible<span<const int>, int*, int>::value));
       EXPECT_EQ (true, (std::is_constructible<span<const int>, const int*, int>::value));
       EXPECT_EQ (true, (std::is_constructible<span<int, 42>, int*, int>::value));
       EXPECT_EQ (true, (std::is_constructible<span<const int, 42>, int*, int>::value));
       EXPECT_EQ (true, (std::is_constructible<span<const int, 42>, const int*, int>::value));

       int arr[] = {1, 2, 3};

       // dynamic size
       span<int> s1(arr, 3);
       EXPECT_EQ (3UL, s1.size());
       EXPECT_EQ (arr, s1.data());
       EXPECT_EQ (std::begin(arr), s1.begin());
       EXPECT_EQ (std::end(arr), s1.end());

       // fixed size
       span<int, 3> s2(arr, 3);
       EXPECT_EQ (3UL, s2.size());
       EXPECT_EQ (arr, s2.data());
       EXPECT_EQ (std::begin(arr), s2.begin());
       EXPECT_EQ (std::end(arr), s2.end());

       // pointer pointer
       EXPECT_EQ (true, (std::is_constructible<span<int>, int*, int*>::value));
       EXPECT_EQ (true, (std::is_constructible<span<float>, float*, float*>::value));
       EXPECT_EQ (true, (std::is_constructible<span<int, 42>, int*, int*>::value));
       EXPECT_EQ (true, (std::is_constructible<span<float, 42>, float*, float*>::value));

       // dynamic size
       span<int> s3(arr, arr + 3);
       EXPECT_EQ (3UL, s3.size());
       EXPECT_EQ (arr, s3.data());
       EXPECT_EQ (std::begin(arr), s3.begin());
       EXPECT_EQ (std::end(arr), s3.end());

       // fixed size
       span<int, 3> s4(arr, arr + 3);
       EXPECT_EQ (3UL, s4.size());
       EXPECT_EQ (arr, s4.data());
       EXPECT_EQ (std::begin(arr), s4.begin());
       EXPECT_EQ (std::end(arr), s4.end());
   }

   TEST (Tspan, C_array_constructors) {
       using int_array_t = int[3];
       using float_array_t = float[3];

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<int>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int>, float_array_t>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int>, int_array_t&>::value));
       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int>, float_array_t>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<int, 3>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, float_array_t&>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int, 3>, int_array_t&>::value));
       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int, 3>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 3>, float_array_t>::value));

       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, float_array_t&>::value));

       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, float_array_t&>::value));

       int arr[] = {1, 2, 3};

       // non-const dynamic size
       span<int> s1{arr};
       EXPECT_EQ (s1.size(), 3UL);
       EXPECT_EQ (s1.data(), arr);
       EXPECT_EQ (s1.begin(), std::begin(arr));
       EXPECT_EQ (s1.end(), std::end(arr));

       // non-const dynamic size
       span<const int> s2{arr};
       EXPECT_EQ (s2.size(), 3UL);
       EXPECT_EQ (s2.data(), arr);
       EXPECT_EQ (s2.begin(), std::begin(arr));
       EXPECT_EQ (s2.end(), std::end(arr));

       // non-const fixed size
       span<int, 3> s3{arr};
       EXPECT_EQ (s3.size(), 3UL);
       EXPECT_EQ (s3.data(), arr);
       EXPECT_EQ (s3.begin(), std::begin(arr));
       EXPECT_EQ (s3.end(), std::end(arr));

       // non-const fixed size
       span<const int, 3> s4{arr};
       EXPECT_EQ (s4.size(), 3UL);
       EXPECT_EQ (s4.data(), arr);
       EXPECT_EQ (s4.begin(), std::begin(arr));
       EXPECT_EQ (s4.end(), std::end(arr));
   }

   TEST (Tspan, array_constructors) {
       using int_array_t = std::array<int, 3>;
       using float_array_t = std::array<float, 3>;
       using zero_array_t = std::array<int, 0>;

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<int>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int>, float_array_t>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int>, int_array_t&>::value));
       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int>, float_array_t const&>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<int, 3>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, float_array_t>::value));

       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int, 3>, int_array_t&>::value));
       EXPECT_EQ (true, ( std::is_nothrow_constructible<span<const int, 3>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 3>, float_array_t const&>::value));

       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 42>, float_array_t const&>::value));

       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, int_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, int_array_t const&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<const int, 42>, float_array_t&>::value));

       EXPECT_EQ (true, ( std::is_constructible<span<int>, zero_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int>, const zero_array_t&>::value));
       EXPECT_EQ (true, ( std::is_constructible<span<const int>, zero_array_t&>::value));
       EXPECT_EQ (true, ( std::is_constructible<span<const int>, const zero_array_t&>::value));

       EXPECT_EQ (true, ( std::is_constructible<span<int, 0>, zero_array_t&>::value));
       EXPECT_EQ (true, (!std::is_constructible<span<int, 0>, const zero_array_t&>::value));
       EXPECT_EQ (true, ( std::is_constructible<span<const int, 0>, zero_array_t&>::value));
       EXPECT_EQ (true, ( std::is_constructible<span<const int, 0>, const zero_array_t&>::value));


       int_array_t arr = {1, 2, 3};

       // non-const, dynamic size
       span<int> s1{arr};
       EXPECT_EQ(s1.size(), 3UL);
       EXPECT_EQ(s1.data(), arr.data());
       EXPECT_EQ(s1.begin(), arr.data());
       EXPECT_EQ(s1.end(), arr.data() + 3);


       //const, dynamic size
       span<int const> s2{arr};
       EXPECT_EQ(s2.size(), 3UL);
       EXPECT_EQ(s2.data(), arr.data());
       EXPECT_EQ(s2.begin(), arr.data());
       EXPECT_EQ(s2.end(), arr.data() + 3);


       // non-const, static size
       span<int, 3> s3{arr};
       EXPECT_EQ(s3.size(), 3UL);
       EXPECT_EQ(s3.data(), arr.data());
       EXPECT_EQ(s3.begin(), arr.data());
       EXPECT_EQ(s3.end(), arr.data() + 3);

       // const, dynamic size
       span<int const, 3> s4{arr};
       EXPECT_EQ(s4.size(), 3UL);
       EXPECT_EQ(s4.data(), arr.data());
       EXPECT_EQ(s4.begin(), arr.data());
       EXPECT_EQ(s4.end(), arr.data() + 3);
   }

//   TEST (Tspan, containter_constructors) {
//       using container_t = tbx::deque<int, 3>;
//
//       EXPECT_EQ (true, ( std::is_constructible<span<int>, container_t&>::value));
//       EXPECT_EQ (true, (!std::is_constructible<span<int>, const container_t&>::value));
//
//       EXPECT_EQ (true, ( std::is_constructible<span<const int>, container_t&>::value));
//       EXPECT_EQ (true, ( std::is_constructible<span<const int>, const container_t&>::value));
//
//       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, container_t&>::value));
//       EXPECT_EQ (true, (!std::is_constructible<span<int, 3>, const container_t&>::value));
//
//       EXPECT_EQ (true, (!std::is_constructible<span<const int, 3>, container_t&>::value));
//       EXPECT_EQ (true, (!std::is_constructible<span<const int, 3>, const container_t&>::value));
//
//       container_t cont = {1, 2, 3};
//       const container_t ccont = {1, 2, 3};
//
//       // non-const, dynamic size
//       span<int> s1(cont);
//       EXPECT_EQ(s1.size(), 3UL);
//       EXPECT_EQ(s1.data(), cont.data());
//       EXPECT_EQ(s1.begin(), cont.data());
//       EXPECT_EQ(s1.end(), cont.data() + 3);
//
//
//       //const, dynamic size
//       span<int const> s2(cont);
//       EXPECT_EQ(s2.size(), 3UL);
//       EXPECT_EQ(s2.data(), cont.data());
//       EXPECT_EQ(s2.begin(), cont.data());
//       EXPECT_EQ(s2.end(), cont.data() + 3);
//
//   }

}