// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <memory>

#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gl/gl_egl_api_implementation.h"
#include "ui/gl/gl_surface_egl.h"
#include "ui/gl/gl_switches.h"
#include "ui/gl/init/gl_factory.h"

namespace gl {

class EGLApiTest : public testing::Test {
 public:
  void SetUp() override {
    fake_client_extension_string_ = "";
    fake_extension_string_ = "";

    g_driver_egl.fn.eglInitializeFn = &FakeInitialize;
    g_driver_egl.fn.eglTerminateFn = &FakeTerminate;
    g_driver_egl.fn.eglQueryStringFn = &FakeQueryString;
    g_driver_egl.fn.eglGetCurrentDisplayFn = &FakeGetCurrentDisplay;
    g_driver_egl.fn.eglGetDisplayFn = &FakeGetDisplay;
    g_driver_egl.fn.eglGetErrorFn = &FakeGetError;
    g_driver_egl.fn.eglGetProcAddressFn = &FakeGetProcAddress;

#if defined(OS_WIN)
    SetGLImplementation(kGLImplementationEGLANGLE);
#else
    SetGLImplementation(kGLImplementationEGLGLES2);
#endif
  }

  void TearDown() override {
    init::ShutdownGL(false);
    api_.reset(nullptr);

    fake_client_extension_string_ = "";
    fake_extension_string_ = "";
  }

  void InitializeAPI(const char* disabled_extensions) {
    api_ = std::make_unique<RealEGLApi>();
    g_current_egl_context = api_.get();
    api_->Initialize(&g_driver_egl);
    if (disabled_extensions) {
      SetDisabledExtensionsEGL(disabled_extensions);
    }
    g_driver_egl.InitializeClientExtensionBindings();
    GLSurfaceEGL::InitializeDisplay(EGLDisplayPlatform(EGL_DEFAULT_DISPLAY));
    g_driver_egl.InitializeExtensionBindings();
  }

  void SetFakeExtensionString(const char* fake_string,
                              const char* fake_client_string) {
    fake_extension_string_ = fake_string;
    fake_client_extension_string_ = fake_client_string;
  }

  static EGLBoolean GL_BINDING_CALL FakeInitialize(EGLDisplay display,
                                                   EGLint * major,
                                                   EGLint * minor) {
    return EGL_TRUE;
  }

  static EGLBoolean GL_BINDING_CALL FakeTerminate(EGLDisplay dpy) {
    return EGL_TRUE;
  }

  static const char* GL_BINDING_CALL FakeQueryString(EGLDisplay dpy,
                                                     EGLint name) {
    if (dpy == EGL_NO_DISPLAY) {
      return fake_client_extension_string_;
    } else {
      return fake_extension_string_;
    }
  }

  static EGLDisplay GL_BINDING_CALL FakeGetCurrentDisplay() {
    return reinterpret_cast<EGLDisplay>(0x1);
  }

  static EGLDisplay GL_BINDING_CALL FakeGetDisplay(
      EGLNativeDisplayType native_display) {
    return reinterpret_cast<EGLDisplay>(0x1);
  }

  static EGLint GL_BINDING_CALL FakeGetError() {
    return EGL_SUCCESS;
  }

  static __eglMustCastToProperFunctionPointerType GL_BINDING_CALL
  FakeGetProcAddress(const char* procname) {
    return nullptr;
  }

  std::pair<const char*, const char*> GetExtensions() {
    return std::make_pair(
        api_->eglQueryStringFn(EGL_NO_DISPLAY, EGL_EXTENSIONS),
        api_->eglQueryStringFn(api_->eglGetCurrentDisplayFn(), EGL_EXTENSIONS));
  }

 protected:
  static const char* fake_extension_string_;
  static const char* fake_client_extension_string_;

  std::unique_ptr<RealEGLApi> api_;
};

const char* EGLApiTest::fake_extension_string_ = "";
const char* EGLApiTest::fake_client_extension_string_ = "";

TEST_F(EGLApiTest, DisabledExtensionBitTest) {
  static const char* kFakeExtensions = "EGL_KHR_fence_sync";
  static const char* kFakeClientExtensions = "";
  static const char* kFakeDisabledExtensions = "EGL_KHR_fence_sync";

  SetFakeExtensionString(kFakeExtensions, kFakeClientExtensions);
  InitializeAPI(nullptr);

  EXPECT_TRUE(g_driver_egl.ext.b_EGL_KHR_fence_sync);

  InitializeAPI(kFakeDisabledExtensions);

  EXPECT_FALSE(g_driver_egl.ext.b_EGL_KHR_fence_sync);
}

TEST_F(EGLApiTest, DisabledExtensionStringTest) {
  static const char* kFakeExtensions =
      "EGL_EXT_1 EGL_KHR_fence_sync EGL_EXT_3 EGL_KHR_wait_sync";
  static const char* kFakeClientExtensions =
      "EGL_CLIENT_EXT_1 EGL_CLIENT_EXT_2";
  static const char* kFakeDisabledExtensions =
      "EGL_KHR_fence_sync,EGL_KHR_wait_sync";
  static const char* kFilteredExtensions = "EGL_EXT_1 EGL_EXT_3";
  static const char* kFilteredClientExtensions =
      "EGL_CLIENT_EXT_1 EGL_CLIENT_EXT_2";

  SetFakeExtensionString(kFakeExtensions, kFakeClientExtensions);
  InitializeAPI(nullptr);

  EXPECT_STREQ(kFakeClientExtensions, GetExtensions().first);
  EXPECT_STREQ(kFakeExtensions, GetExtensions().second);

  InitializeAPI(kFakeDisabledExtensions);

  EXPECT_STREQ(kFilteredClientExtensions, GetExtensions().first);
  EXPECT_STREQ(kFilteredExtensions, GetExtensions().second);
}

}  // namespace gl