#include <gtest/gtest.h>

#include "buffer.hh"

#include <cstring>

TEST(buffer_fixed, empty) {
  auto buffer = Buffer::fixed(10);
  EXPECT_TRUE(buffer->empty());
  EXPECT_FALSE(buffer->full());
  size_t avail;
  buffer->rptr(avail);
  EXPECT_EQ(0, avail);
  buffer->wptr(avail);
  EXPECT_EQ(10, avail);
}

TEST(buffer_dynamic, empty) {
  auto buffer = Buffer::dynamic(10, 100);
  EXPECT_TRUE(buffer->empty());
  EXPECT_FALSE(buffer->full());
  size_t avail;
  buffer->rptr(avail);
  EXPECT_EQ(0, avail);
  buffer->wptr(avail);
  EXPECT_EQ(10, avail);
}

TEST(buffer_fixed, write_read) {
  auto buffer = Buffer::fixed(10);
  size_t avail;
  auto* wptr = buffer->wptr(avail);
  EXPECT_EQ(10, avail);
  memcpy(wptr, "Hello", 6);
  buffer->commit(6);
  EXPECT_FALSE(buffer->empty());
  auto* rptr = buffer->rptr(avail);
  EXPECT_EQ(6, avail);
  EXPECT_STREQ("Hello", reinterpret_cast<const char*>(rptr));
  buffer->consume(3);
  rptr = buffer->rptr(avail);
  EXPECT_EQ(3, avail);
  EXPECT_STREQ("lo", reinterpret_cast<const char*>(rptr));
  buffer->consume(3);
  EXPECT_TRUE(buffer->empty());
}

TEST(buffer_dynamic, write_read) {
  auto buffer = Buffer::dynamic(10, 100);
  size_t avail;
  auto* wptr = buffer->wptr(avail);
  EXPECT_EQ(10, avail);
  memcpy(wptr, "Hello", 6);
  buffer->commit(6);
  EXPECT_FALSE(buffer->empty());
  auto* rptr = buffer->rptr(avail);
  EXPECT_EQ(6, avail);
  EXPECT_STREQ("Hello", reinterpret_cast<const char*>(rptr));
  buffer->consume(3);
  rptr = buffer->rptr(avail);
  EXPECT_EQ(3, avail);
  EXPECT_STREQ("lo", reinterpret_cast<const char*>(rptr));
  buffer->consume(3);
  EXPECT_TRUE(buffer->empty());
}