// 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.

#ifndef ASH_COMMON_CAST_CONFIG_DELEGATE_H_
#define ASH_COMMON_CAST_CONFIG_DELEGATE_H_

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

#include "ash/ash_export.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "url/gurl.h"

namespace ash {

// This delegate allows the UI code in ash, e.g. |TrayCastDetailedView|,
// to access the cast extension.
class CastConfigDelegate {
 public:
  struct ASH_EXPORT Receiver {
    Receiver();
    ~Receiver();

    std::string id;
    base::string16 name;
  };

  struct ASH_EXPORT Activity {
    // The tab identifier that we are casting. These are the special tab values
    // taken from the chromecast extension itself. If an actual tab is being
    // casted, then the TabId will be >= 0.
    enum TabId {
      EXTENSION = -1,
      DESKTOP = -2,
      DISCOVERED_ACTIVITY = -3,
      EXTERNAL_EXTENSION_CLIENT = -4,

      // Not in the extension. Used when the extension does not give us a tabId
      // (ie, the cast is running from another device).
      UNKNOWN = -5
    };

    Activity();
    ~Activity();

    std::string id;
    base::string16 title;

    // Is the activity source this computer? ie, are we mirroring the display?
    bool is_local_source = false;

    // The id for the tab we are casting. Could be one of the TabId values,
    // or a value >= 0 that represents that tab index of the tab we are
    // casting. We default to casting the desktop, as a tab may not
    // necessarily exist.
    // TODO(jdufault): Remove tab_id once the CastConfigDelegateChromeos is
    // gone. See crbug.com/551132.
    int tab_id = TabId::DESKTOP;
  };

  struct ASH_EXPORT ReceiverAndActivity {
    ReceiverAndActivity();
    ~ReceiverAndActivity();

    Receiver receiver;
    Activity activity;
  };

  using ReceiversAndActivities = std::vector<ReceiverAndActivity>;

  class ASH_EXPORT Observer {
   public:
    // Invoked whenever there is new receiver or activity information available.
    virtual void OnDevicesUpdated(const ReceiversAndActivities& devices) = 0;

   protected:
    virtual ~Observer() {}

   private:
    DISALLOW_ASSIGN(Observer);
  };

  virtual ~CastConfigDelegate() {}

  // Returns true if cast extension is installed.
  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
  // gone. See crbug.com/551132.
  virtual bool HasCastExtension() const = 0;

  // Request fresh data from the backend. When the data is available, all
  // registered observers will get called.
  virtual void RequestDeviceRefresh() = 0;

  // Cast to a receiver specified by |receiver_id|.
  virtual void CastToReceiver(const std::string& receiver_id) = 0;

  // Stop an ongoing cast (this should be a user initiated stop). |activity_id|
  // is the identifier of the activity/route that should be stopped.
  virtual void StopCasting(const std::string& activity_id) = 0;

  // Does the device have a settings page?
  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
  // gone. See crbug.com/551132.
  virtual bool HasOptions() const = 0;

  // Opens Options page for cast.
  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
  // gone. See crbug.com/551132.
  virtual void LaunchCastOptions() = 0;

  // Add or remove an observer.
  virtual void AddObserver(Observer* observer) = 0;
  virtual void RemoveObserver(Observer* observer) = 0;

 private:
  DISALLOW_ASSIGN(CastConfigDelegate);
};

}  // namespace ash

#endif  // ASH_COMMON_CAST_CONFIG_DELEGATE_H_