// Copyright 2015 The Chromium OS 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 LIBWEAVE_INCLUDE_WEAVE_DEVICE_H_
#define LIBWEAVE_INCLUDE_WEAVE_DEVICE_H_

#include <memory>
#include <set>
#include <string>

#include <weave/command.h>
#include <weave/export.h>
#include <weave/provider/bluetooth.h>
#include <weave/provider/config_store.h>
#include <weave/provider/dns_service_discovery.h>
#include <weave/provider/http_client.h>
#include <weave/provider/http_server.h>
#include <weave/provider/network.h>
#include <weave/provider/task_runner.h>
#include <weave/provider/wifi.h>

namespace weave {

// States of Gcd connection.
enum class GcdState {
  kUnconfigured,        // We have no credentials.
  kConnecting,          // We have credentials but not yet connected.
  kConnected,           // We're registered and connected to the cloud.
  kInvalidCredentials,  // Our registration has been revoked.
};

class Device {
 public:
  virtual ~Device() = default;

  // Returns reference the current settings.
  virtual const Settings& GetSettings() const = 0;

  // Callback type for AddSettingsChangedCallback.
  using SettingsChangedCallback =
      base::Callback<void(const Settings& settings)>;

  // Subscribes to notification settings changes.
  virtual void AddSettingsChangedCallback(
      const SettingsChangedCallback& callback) = 0;

  // Callback type for AddCommandAddedCallback and AddCommandRemovedCallback.
  using CommandCallback = base::Callback<void(Command*)>;

  // Adds notification callback for a new command being added to the queue.
  virtual void AddCommandAddedCallback(const CommandCallback& callback) = 0;

  // Adds notification callback for a command being removed from the queue.
  virtual void AddCommandRemovedCallback(const CommandCallback& callback) = 0;

  // Adds a new command to the command queue.
  virtual bool AddCommand(const base::DictionaryValue& command,
                          std::string* id,
                          ErrorPtr* error) = 0;

  // Finds a command by the command |id|. Returns nullptr if the command with
  // the given |id| is not found. The returned pointer should not be persisted
  // for a long period of time.
  virtual Command* FindCommand(const std::string& id) = 0;

  // Sets callback which is called when stat is changed.
  virtual void AddStateChangedCallback(const base::Closure& callback) = 0;

  // Returns value of the single property.
  // |name| is full property name, including package name. e.g. "base.network".
  virtual std::unique_ptr<base::Value> GetStateProperty(
      const std::string& name) const = 0;

  // Sets value of the single property.
  // |name| is full property name, including package name. e.g. "base.network".
  virtual bool SetStateProperty(const std::string& name,
                                const base::Value& value,
                                ErrorPtr* error) = 0;

  // Updates a multiple property values.
  virtual bool SetStateProperties(const base::DictionaryValue& property_set,
                                  ErrorPtr* error) = 0;

  // Returns aggregated state properties across all registered packages.
  virtual std::unique_ptr<base::DictionaryValue> GetState() const = 0;

  // Returns current state of GCD connection.
  virtual GcdState GetGcdState() const = 0;

  // Callback type for GcdStatusCallback.
  using GcdStateChangedCallback = base::Callback<void(GcdState state)>;

  // Sets callback which is called when state of server connection changed.
  virtual void AddGcdStateChangedCallback(
      const GcdStateChangedCallback& callback) = 0;

  // Registers the device. Returns a device ID on success.
  // This is testing method and should not be used by applications.
  virtual std::string Register(const std::string& ticket_id,
                               ErrorPtr* error) = 0;

  // Handler should display pin code to the user.
  using PairingBeginCallback =
      base::Callback<void(const std::string& session_id,
                          PairingType pairing_type,
                          const std::vector<uint8_t>& code)>;

  // Handler should stop displaying pin code.
  using PairingEndCallback =
      base::Callback<void(const std::string& session_id)>;
  // Subscribes to notification about client pairing events.

  virtual void AddPairingChangedCallbacks(
      const PairingBeginCallback& begin_callback,
      const PairingEndCallback& end_callback) = 0;

  LIBWEAVE_EXPORT static std::unique_ptr<Device> Create(
      provider::ConfigStore* config_store,
      provider::TaskRunner* task_runner,
      provider::HttpClient* http_client,
      provider::Network* network,
      provider::DnsServiceDiscovery* dns_sd,
      provider::HttpServer* http_server,
      provider::Wifi* wifi,
      provider::Bluetooth* bluetooth_provider);
};

}  // namespace weave

#endif  // LIBWEAVE_INCLUDE_WEAVE_DEVICE_H_