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//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "base/call_wrapper.h"
#include "base/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace {

int global_int = 0;

void SetGlobalInt5() {
  global_int = 5;
}
void SetGlobalInt(int x) {
  global_int = x;
}
void SetInt(int* p, int x) {
  *p = x;
}
void SetIntAdd2(int* p, int x, int y) {
  *p = x + y;
}
void SetIntAdd3(int* p, int x, int y, int z) {
  *p = x + y + z;
}
void SetIntAdd4(int* p, int x, int y, int z, int w) {
  *p = x + y + z + w;
}

}  // namespace

TEST(CallWrapperTest, FunctionCall) {
  // Function call with 0 arguments.
  {
    EXPECT_EQ(0, global_int);
    scoped_ptr<base::CallWrapper> wrapper(
        base::NewFunctionCallWrapper(&SetGlobalInt5));

    EXPECT_EQ(0, global_int);
    wrapper->Run();
    EXPECT_EQ(5, global_int);

    global_int = 0;
    wrapper->Run();
    EXPECT_EQ(5, global_int);
  }
  // Function call with 1 argument.
  {
    EXPECT_EQ(5, global_int);
    scoped_ptr<base::CallWrapper> wrapper(
        base::NewFunctionCallWrapper(&SetGlobalInt, 0));

    EXPECT_EQ(5, global_int);
    wrapper->Run();
    EXPECT_EQ(0, global_int);

    global_int = 5;
    wrapper->Run();
    EXPECT_EQ(0, global_int);
  }
  // Function call with 2 arguments.
  {
    int stack_int = 4;
    scoped_ptr<base::CallWrapper> wrapper;

    wrapper.reset(base::NewFunctionCallWrapper(&SetInt, &global_int, 8));
    EXPECT_EQ(4, stack_int);
    EXPECT_EQ(0, global_int);
    wrapper->Run();
    EXPECT_EQ(4, stack_int);
    EXPECT_EQ(8, global_int);

    wrapper.reset(base::NewFunctionCallWrapper(&SetInt, &stack_int, 8));
    EXPECT_EQ(4, stack_int);
    EXPECT_EQ(8, global_int);
    wrapper->Run();
    EXPECT_EQ(8, stack_int);
    EXPECT_EQ(8, global_int);
  }
  // Function call with 3-5 arguments.
  {
    int stack_int = 12;
    scoped_ptr<base::CallWrapper> wrapper;

    wrapper.reset(
        base::NewFunctionCallWrapper(&SetIntAdd2, &stack_int, 1, 6));
    EXPECT_EQ(12, stack_int);
    wrapper->Run();
    EXPECT_EQ(7, stack_int);

    wrapper.reset(
        base::NewFunctionCallWrapper(&SetIntAdd3, &stack_int, 1, 6, 2));
    EXPECT_EQ(7, stack_int);
    wrapper->Run();
    EXPECT_EQ(9, stack_int);

    wrapper.reset(
        base::NewFunctionCallWrapper(&SetIntAdd4, &stack_int, 1, 6, 2, 3));
    EXPECT_EQ(9, stack_int);
    wrapper->Run();
    EXPECT_EQ(12, stack_int);

    global_int = 2;
    wrapper->Run();
    EXPECT_EQ(12, stack_int);
  }
}

namespace {

class Incrementer {
 public:
  Incrementer(int* ptr) : ptr_(ptr) { }
  void IncrementBy(int x) { *ptr_ += x; }
  void Increment() { IncrementBy(1); }
  void SetIntAdd2(int x, int y) { *ptr_ = x + y; }
  void SetIntAdd3(int x, int y, int z) { *ptr_ = x + y + z; }
  void SetIntAdd4(int x, int y, int z, int w) { *ptr_ = x + y + z + w; }
 private:
  int* ptr_;
};

}  // namespace

TEST(CallWrapperTest, MethodCall) {
  // Method call with 0 and 1 arguments.
  {
    int stack_int = 0;
    Incrementer incr(&stack_int);
    scoped_ptr<base::CallWrapper> wrapper;

    wrapper.reset(
        base::NewMethodCallWrapper(&incr, &Incrementer::Increment));
    EXPECT_EQ(0, stack_int);
    wrapper->Run();
    EXPECT_EQ(1, stack_int);

    wrapper.reset(
        base::NewMethodCallWrapper(&incr, &Incrementer::IncrementBy, 10));
    EXPECT_EQ(1, stack_int);
    wrapper->Run();
    EXPECT_EQ(11, stack_int);
    wrapper->Run();
    EXPECT_EQ(21, stack_int);
    wrapper->Run();
    EXPECT_EQ(31, stack_int);
  }
  // Method call with 2-5 arguments.
  {
    int stack_int = 0;
    Incrementer incr(&stack_int);
    scoped_ptr<base::CallWrapper> wrapper;

    wrapper.reset(
        base::NewMethodCallWrapper(&incr, &Incrementer::SetIntAdd2, 1, 5));
    EXPECT_EQ(0, stack_int);
    wrapper->Run();
    EXPECT_EQ(6, stack_int);

    wrapper.reset(
        base::NewMethodCallWrapper(&incr, &Incrementer::SetIntAdd3, 1, 5, 7));
    EXPECT_EQ(6, stack_int);
    wrapper->Run();
    EXPECT_EQ(13, stack_int);

    wrapper.reset(
        base::NewMethodCallWrapper(&incr,
                                   &Incrementer::SetIntAdd4, 1, 5, 7, 2));
    EXPECT_EQ(13, stack_int);
    wrapper->Run();
    EXPECT_EQ(15, stack_int);

    stack_int = 2;
    wrapper->Run();
    EXPECT_EQ(15, stack_int);
  }
}