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

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "remoting/host/mouse_shape_pump.h"

#include <stdint.h>

#include <utility>

#include "base/functional/bind.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "remoting/proto/control.pb.h"
#include "remoting/protocol/cursor_shape_stub.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
#include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
#include "third_party/webrtc/modules/desktop_capture/mouse_cursor_monitor.h"

namespace {
// Poll mouse shape at least 10 times a second.
constexpr base::TimeDelta kMaxCursorCaptureInterval = base::Milliseconds(100);

// Poll mouse shape at most 100 times a second.
constexpr base::TimeDelta kMinCursorCaptureInterval = base::Milliseconds(10);
}  // namespace

namespace remoting {

MouseShapePump::MouseShapePump(
    std::unique_ptr<webrtc::MouseCursorMonitor> mouse_cursor_monitor,
    protocol::CursorShapeStub* cursor_shape_stub)
    : mouse_cursor_monitor_(std::move(mouse_cursor_monitor)),
      cursor_shape_stub_(cursor_shape_stub) {
  mouse_cursor_monitor_->Init(this,
                              webrtc::MouseCursorMonitor::SHAPE_AND_POSITION);
  StartCaptureTimer(kMaxCursorCaptureInterval);
}

MouseShapePump::~MouseShapePump() {
  DCHECK(thread_checker_.CalledOnValidThread());
}

void MouseShapePump::SetCursorCaptureInterval(base::TimeDelta new_interval) {
  StartCaptureTimer(std::clamp(new_interval, kMinCursorCaptureInterval,
                               kMaxCursorCaptureInterval));
}

void MouseShapePump::SetMouseCursorMonitorCallback(
    webrtc::MouseCursorMonitor::Callback* callback) {
  callback_ = callback;
}

void MouseShapePump::Capture() {
  DCHECK(thread_checker_.CalledOnValidThread());

  mouse_cursor_monitor_->Capture();
}

void MouseShapePump::StartCaptureTimer(base::TimeDelta capture_interval) {
  capture_timer_.Start(
      FROM_HERE, std::move(capture_interval),
      base::BindRepeating(&MouseShapePump::Capture, base::Unretained(this)));
}

void MouseShapePump::OnMouseCursor(webrtc::MouseCursor* cursor) {
  DCHECK(thread_checker_.CalledOnValidThread());

  if (!cursor) {
    return;
  }

  std::unique_ptr<webrtc::MouseCursor> owned_cursor(cursor);

  if (cursor_shape_stub_) {
    std::unique_ptr<protocol::CursorShapeInfo> cursor_proto(
        new protocol::CursorShapeInfo());

    cursor_proto->set_data(std::string());
    if (cursor->image() && cursor->image()->data()) {
      cursor_proto->set_width(cursor->image()->size().width());
      cursor_proto->set_height(cursor->image()->size().height());
      cursor_proto->set_hotspot_x(cursor->hotspot().x());
      cursor_proto->set_hotspot_y(cursor->hotspot().y());

      uint8_t* current_row = cursor->image()->data();
      for (int y = 0; y < cursor->image()->size().height(); ++y) {
        cursor_proto->mutable_data()->append(
            current_row,
            current_row + cursor->image()->size().width() *
                              webrtc::DesktopFrame::kBytesPerPixel);
        current_row += cursor->image()->stride();
      }
    } else {
      cursor_proto->set_width(0);
      cursor_proto->set_height(0);
      cursor_proto->set_hotspot_x(0);
      cursor_proto->set_hotspot_y(0);
    }

    cursor_shape_stub_->SetCursorShape(*cursor_proto);
  }

  if (callback_) {
    callback_->OnMouseCursor(owned_cursor.release());
  }
}

void MouseShapePump::OnMouseCursorPosition(
    const webrtc::DesktopVector& position) {
  if (callback_) {
    callback_->OnMouseCursorPosition(position);
  }
}

}  // namespace remoting