#include <gtest/gtest.h>
#include <jellyfish/simple_circular_buffer.hpp>

namespace {

static const int capa = 16;
typedef jellyfish::simple_circular_buffer::pre_alloc<int, capa> test_simple_circular_buffer;

TEST(SimpleCircularBufferTest, FillEmpty) {
  int ary[capa];
  test_simple_circular_buffer buffer(ary);
  EXPECT_EQ(capa, buffer.capacity());

  EXPECT_TRUE(buffer.empty());
  for(int i = 0; i < buffer.capacity(); ++i) {
    SCOPED_TRACE(::testing::Message() << "i=" << i);
    EXPECT_FALSE(buffer.full());
    EXPECT_EQ(i, buffer.size());
    buffer.push_back(i);
    EXPECT_EQ(i, buffer.back());
    EXPECT_FALSE(buffer.empty());
  }
  EXPECT_TRUE(buffer.full());

  for(int i = 0; i < buffer.capacity(); ++i) {
    SCOPED_TRACE(::testing::Message() << "i=" << i);
    EXPECT_FALSE(buffer.empty());
    EXPECT_EQ(i, buffer.front());
    EXPECT_EQ(buffer.capacity() - i, buffer.size());
    buffer.pop_front();
    EXPECT_FALSE(buffer.full());
  }
  EXPECT_TRUE(buffer.empty());
  EXPECT_EQ(0, buffer.size());
}

TEST(SimpleCircularBufferTest, Usefull) {
  int ary[capa];
  test_simple_circular_buffer buffer(ary);
  EXPECT_EQ(capa, buffer.capacity());

  int i = 0;
  for( ; i < buffer.capacity(); ++i) {
    EXPECT_TRUE(buffer.push_back());
    buffer.back() = i;
  }

  for( ; i < 10 * buffer.capacity(); ++i) {
    EXPECT_EQ(i - capa, buffer.front());
    buffer.pop_front();
    EXPECT_TRUE(buffer.push_back());
    buffer.back() = i;
  }
}

} // namespace {