// Copyright (c) 2012 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 "ui/gfx/platform_font_linux.h"

#include <string>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/font.h"
#include "ui/gfx/font_render_params.h"
#include "ui/gfx/linux_font_delegate.h"
#include "ui/gfx/test/fontconfig_util_linux.h"

namespace gfx {

// Implementation of LinuxFontDelegate used to control the default font
// description on Linux.
class TestFontDelegate : public LinuxFontDelegate {
 public:
  TestFontDelegate()
      : size_pixels_(0), style_(Font::NORMAL), weight_(Font::Weight::NORMAL) {}
  ~TestFontDelegate() override {}

  void set_family(const std::string& family) { family_ = family; }
  void set_size_pixels(int size_pixels) { size_pixels_ = size_pixels; }
  void set_style(int style) { style_ = style; }
  void set_weight(gfx::Font::Weight weight) { weight_ = weight; }
  void set_params(const FontRenderParams& params) { params_ = params; }

  FontRenderParams GetDefaultFontRenderParams() const override {
    NOTIMPLEMENTED();
    return FontRenderParams();
  }

  void GetDefaultFontDescription(std::string* family_out,
                                 int* size_pixels_out,
                                 int* style_out,
                                 Font::Weight* weight_out,
                                 FontRenderParams* params_out) const override {
    *family_out = family_;
    *size_pixels_out = size_pixels_;
    *style_out = style_;
    *weight_out = weight_;
    *params_out = params_;
  }

 private:
  // Default values to be returned.
  std::string family_;
  int size_pixels_;
  int style_;
  gfx::Font::Weight weight_;
  FontRenderParams params_;

  DISALLOW_COPY_AND_ASSIGN(TestFontDelegate);
};

class PlatformFontLinuxTest : public testing::Test {
 public:
  PlatformFontLinuxTest() {
    SetUpFontconfig();
    original_font_delegate_ = LinuxFontDelegate::instance();
    LinuxFontDelegate::SetInstance(&test_font_delegate_);
  }

  ~PlatformFontLinuxTest() override {
    LinuxFontDelegate::SetInstance(
        const_cast<LinuxFontDelegate*>(original_font_delegate_));
    PlatformFontLinux::ReloadDefaultFont();
    TearDownFontconfig();
  }

 protected:
  TestFontDelegate test_font_delegate_;

 private:
  // Originally-registered delegate.
  const LinuxFontDelegate* original_font_delegate_;

  DISALLOW_COPY_AND_ASSIGN(PlatformFontLinuxTest);
};

// Test that PlatformFontLinux's default constructor initializes the instance
// with the correct parameters.
TEST_F(PlatformFontLinuxTest, DefaultFont) {
  ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
  ASSERT_TRUE(LoadSystemFontIntoFontconfig("times_new_roman.ttf"));

#if defined(OS_CHROMEOS)
  PlatformFontLinux::SetDefaultFontDescription("Arial,Times New Roman,13px");
#else
  test_font_delegate_.set_family("Arial");
  test_font_delegate_.set_size_pixels(13);
  test_font_delegate_.set_style(Font::NORMAL);
  FontRenderParams params;
  params.antialiasing = false;
  params.hinting = FontRenderParams::HINTING_FULL;
  test_font_delegate_.set_params(params);
#endif
  scoped_refptr<gfx::PlatformFontLinux> font(new gfx::PlatformFontLinux());
  EXPECT_EQ("Arial", font->GetFontName());
  EXPECT_EQ(13, font->GetFontSize());
  EXPECT_EQ(gfx::Font::NORMAL, font->GetStyle());
#if !defined(OS_CHROMEOS)
  // On Linux, the FontRenderParams returned by the the delegate should be used.
  EXPECT_EQ(params.antialiasing, font->GetFontRenderParams().antialiasing);
  EXPECT_EQ(params.hinting, font->GetFontRenderParams().hinting);
#endif

  // Drop the old default font and check that new settings are loaded.
#if defined(OS_CHROMEOS)
  PlatformFontLinux::SetDefaultFontDescription(
      "Times New Roman,Arial,Bold Italic 15px");
#else
  test_font_delegate_.set_family("Times New Roman");
  test_font_delegate_.set_size_pixels(15);
  test_font_delegate_.set_style(gfx::Font::ITALIC);
  test_font_delegate_.set_weight(gfx::Font::Weight::BOLD);
#endif
  PlatformFontLinux::ReloadDefaultFont();
  scoped_refptr<gfx::PlatformFontLinux> font2(new gfx::PlatformFontLinux());
  EXPECT_EQ("Times New Roman", font2->GetFontName());
  EXPECT_EQ(15, font2->GetFontSize());
  EXPECT_NE(font2->GetStyle() & Font::ITALIC, 0);
  EXPECT_EQ(gfx::Font::Weight::BOLD, font2->GetWeight());
}

}  // namespace gfx
