// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_WEBDRIVER_ELEMENT_DRIVER_H_
#define COBALT_WEBDRIVER_ELEMENT_DRIVER_H_

#include <memory>
#include <string>
#include <vector>

#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/threading/thread_checker.h"
#include "cobalt/base/token.h"
#include "cobalt/dom/element.h"
#include "cobalt/dom/keyboard_event_init.h"
#include "cobalt/dom/pointer_event_init.h"
#include "cobalt/webdriver/element_mapping.h"
#include "cobalt/webdriver/keyboard.h"
#include "cobalt/webdriver/protocol/button.h"
#include "cobalt/webdriver/protocol/element_id.h"
#include "cobalt/webdriver/protocol/keys.h"
#include "cobalt/webdriver/protocol/location.h"
#include "cobalt/webdriver/protocol/rect.h"
#include "cobalt/webdriver/protocol/search_strategy.h"
#include "cobalt/webdriver/protocol/size.h"
#include "cobalt/webdriver/screenshot.h"
#include "cobalt/webdriver/util/command_result.h"

namespace cobalt {
namespace webdriver {

class WindowDriver;

// ElementDriver could be considered a WebElement as described in the WebDriver
// spec.
// https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol#webelement
// Commands that interact with a WebElement, such as:
//     /session/:sessionId/element/:id/some_command
// will map to a method on this class.
class ElementDriver {
 public:
  typedef base::Callback<void(scoped_refptr<dom::Element>, const base::Token,
                              const dom::KeyboardEventInit&)>
      KeyboardEventInjector;
  typedef base::Callback<void(scoped_refptr<dom::Element>, const base::Token,
                              const dom::PointerEventInit&)>
      PointerEventInjector;

  ElementDriver(
      const protocol::ElementId& element_id,
      const base::WeakPtr<dom::Element>& element,
      ElementMapping* element_mapping,
      KeyboardEventInjector keyboard_event_injector,
      PointerEventInjector pointer_event_injector,
      const scoped_refptr<base::SingleThreadTaskRunner>& message_loop);
  const protocol::ElementId& element_id() { return element_id_; }

  util::CommandResult<std::string> GetTagName();
  util::CommandResult<std::string> GetText();
  util::CommandResult<bool> IsDisplayed();
  util::CommandResult<protocol::Rect> GetRect();
  util::CommandResult<protocol::Location> GetLocation();
  util::CommandResult<protocol::Size> GetSize();
  util::CommandResult<void> SendKeys(const protocol::Keys& keys);
  util::CommandResult<protocol::ElementId> FindElement(
      const protocol::SearchStrategy& strategy);
  util::CommandResult<std::vector<protocol::ElementId> > FindElements(
      const protocol::SearchStrategy& strategy);
  util::CommandResult<void> SendClick(const protocol::Button& button);
  util::CommandResult<bool> Equals(ElementDriver* other_element_driver);
  util::CommandResult<base::Optional<std::string> > GetAttribute(
      const std::string& attribute_name);
  util::CommandResult<std::string> GetCssProperty(
      const std::string& property_name);
  util::CommandResult<std::string> RequestScreenshot(
      Screenshot::GetScreenshotFunction);

 private:
  typedef std::vector<protocol::ElementId> ElementIdVector;

  // Get the dom::Element* that this ElementDriver wraps. This must be called
  // on |element_task_runner_|.
  dom::Element* GetWeakElement();

  util::CommandResult<void> SendKeysInternal(
      std::unique_ptr<Keyboard::KeyboardEventVector> keyboard_events);

  util::CommandResult<void> SendClickInternal(const protocol::Button& button);

  util::CommandResult<std::string> RequestScreenshotInternal(
      Screenshot::GetScreenshotFunction get_screenshot_function);

  // Shared logic between FindElement and FindElements.
  template <typename T>
  util::CommandResult<T> FindElementsInternal(
      const protocol::SearchStrategy& strategy);

  util::CommandResult<bool> EqualsInternal(
      const ElementDriver* other_element_driver);

  protocol::ElementId element_id_;

  // These should only be accessed from |element_task_runner_|.
  base::WeakPtr<dom::Element> element_;
  ElementMapping* element_mapping_;
  KeyboardEventInjector keyboard_event_injector_;
  PointerEventInjector pointer_event_injector_;
  scoped_refptr<base::SingleThreadTaskRunner> element_task_runner_;

  friend class WindowDriver;
};

}  // namespace webdriver
}  // namespace cobalt

#endif  // COBALT_WEBDRIVER_ELEMENT_DRIVER_H_