// Copyright 2017 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 "services/shape_detection/text_detection_impl_mac.h"

#include "base/bind.h"
#include "base/command_line.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_nsobject.h"
#include "base/mac/sdk_forward_declarations.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/utils/mac/SkCGUtils.h"
#include "ui/gl/gl_switches.h"

namespace shape_detection {

ACTION_P(RunClosure, closure) {
  closure.Run();
}

class TextDetectionImplMacTest : public ::testing::Test {
 public:
  ~TextDetectionImplMacTest() override = default;

  void DetectCallback(std::vector<mojom::TextDetectionResultPtr> results) {
    // CIDetectorTypeText doesn't return the decoded text, juts bounding boxes.
    Detection(results.size());
  }
  MOCK_METHOD1(Detection, void(size_t));

  API_AVAILABLE(macosx(10.11)) std::unique_ptr<TextDetectionImplMac> impl_;
  const base::MessageLoop message_loop_;
};

TEST_F(TextDetectionImplMacTest, CreateAndDestroy) {}

// This test generates an image with a single text line and scans it back.
TEST_F(TextDetectionImplMacTest, ScanOnce) {
  // Text detection needs at least MAC OS X 10.11, and GPU infrastructure.
  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kUseGpuInTests) ||
      !base::mac::IsAtLeastOS10_11()) {
    return;
  }

  if (@available(macOS 10.11, *)) {
    impl_.reset(new TextDetectionImplMac);
    base::ScopedCFTypeRef<CGColorSpaceRef> rgb_colorspace(
        CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));

    const int width = 200;
    const int height = 50;
    base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
        nullptr, width, height, 8 /* bitsPerComponent */,
        width * 4 /* rowBytes */, rgb_colorspace,
        kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));

    // Draw a white background.
    CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
    CGContextFillRect(context, CGRectMake(0.0, 0.0, width, height));

    // Create a line of Helvetica 16 text, and draw it in the |context|.
    base::scoped_nsobject<NSFont> helvetica(
        [NSFont fontWithName:@"Helvetica" size:16]);
    NSDictionary* attributes = [NSDictionary
        dictionaryWithObjectsAndKeys:helvetica, kCTFontAttributeName, nil];

    base::scoped_nsobject<NSAttributedString> info([[NSAttributedString alloc]
        initWithString:@"https://www.chromium.org"
            attributes:attributes]);

    base::ScopedCFTypeRef<CTLineRef> line(
        CTLineCreateWithAttributedString((CFAttributedStringRef)info.get()));

    CGContextSetTextPosition(context, 10.0, height / 2.0);
    CTLineDraw(line, context);

    // Extract a CGImage and its raw pixels from |context|.
    base::ScopedCFTypeRef<CGImageRef> cg_image(
        CGBitmapContextCreateImage(context));
    EXPECT_EQ(static_cast<size_t>(width), CGImageGetWidth(cg_image));
    EXPECT_EQ(static_cast<size_t>(height), CGImageGetHeight(cg_image));

    SkBitmap bitmap;
    ASSERT_TRUE(SkCreateBitmapFromCGImage(&bitmap, cg_image));

    base::RunLoop run_loop;
    base::Closure quit_closure = run_loop.QuitClosure();
    // Send the image to Detect() and expect the response in callback.
    EXPECT_CALL(*this, Detection(1)).WillOnce(RunClosure(quit_closure));
    impl_->Detect(bitmap, base::Bind(&TextDetectionImplMacTest::DetectCallback,
                                     base::Unretained(this)));

    run_loop.Run();
  }
}

}  // shape_detection namespace