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diff --git a/xbmc/addons/AddonInstaller.h b/xbmc/addons/AddonInstaller.h
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+/*
+ *  Copyright (C) 2011-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include "threads/Event.h"
+#include "utils/Job.h"
+
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+class CFileItemList;
+
+namespace ADDON
+{
+
+class CAddonVersion;
+
+class CAddonDatabase;
+
+class CRepository;
+using RepositoryPtr = std::shared_ptr<CRepository>;
+
+class IAddon;
+using AddonPtr = std::shared_ptr<IAddon>;
+using VECADDONS = std::vector<AddonPtr>;
+
+enum class BackgroundJob : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class ModalJob : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class AutoUpdateJob : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class DependencyJob : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class InstallModalPrompt : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class AllowCheckForUpdates : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+enum class RecurseOrphaned : bool
+{
+  CHOICE_YES = true,
+  CHOICE_NO = false,
+};
+
+class CAddonInstaller : public IJobCallback
+{
+public:
+  static CAddonInstaller &GetInstance();
+
+  bool IsDownloading() const;
+  void GetInstallList(ADDON::VECADDONS &addons) const;
+  bool GetProgress(const std::string& addonID, unsigned int& percent, bool& downloadFinshed) const;
+  bool Cancel(const std::string &addonID);
+
+  /*! \brief Installs the addon while showing a modal progress dialog
+   \param addonID the addon ID of the item to install.
+   \param addon [out] the installed addon for later use.
+   \param promptForInstall Whether or not to prompt the user before installing the addon.
+   \return true on successful install, false otherwise.
+   \sa Install
+   */
+  bool InstallModal(const std::string& addonID,
+                    ADDON::AddonPtr& addon,
+                    InstallModalPrompt promptForInstall);
+
+  /*! \brief Install an addon if it is available in a repository
+   \param addonID the addon ID of the item to install
+   \param background whether to install in the background or not.
+   \param modal whether to show a modal dialog when not installing in background
+   \return true on successful install, false on failure.
+   \sa DoInstall
+   */
+  bool InstallOrUpdate(const std::string& addonID, BackgroundJob background, ModalJob modal);
+
+  /*! \brief Install a dependency from a specific repository
+   \param dependsId the dependency to install
+   \param repo the repository to install the addon from
+   \return true on successful install, false on failure.
+   \sa DoInstall
+   */
+  bool InstallOrUpdateDependency(const ADDON::AddonPtr& dependsId,
+                                 const ADDON::RepositoryPtr& repo);
+
+  /*! \brief Remove a single dependency from the system
+   \param dependsId the dependency to remove
+   \return true on successful uninstall, false on failure.
+   */
+  bool RemoveDependency(const std::shared_ptr<IAddon>& dependsId) const;
+
+  /*!
+   * \brief Removes all orphaned add-ons recursively. Removal may orphan further
+   *        add-ons/dependencies, so loop until no orphaned is left on the system
+   * \return Names of add-ons that have effectively been removed
+   */
+  std::vector<std::string> RemoveOrphanedDepsRecursively() const;
+
+  /*! \brief Installs a vector of addons
+   *  \param addons the list of addons to install
+   *  \param wait if the method should wait for all the DoInstall jobs to finish or if it should return right away
+   *  \param allowCheckForUpdates indicates if content update checks are allowed
+   *         after installation of a repository addon from the vector
+   *  \sa DoInstall
+   */
+  void InstallAddons(const ADDON::VECADDONS& addons,
+                     bool wait,
+                     AllowCheckForUpdates allowCheckForUpdates);
+
+  /*! \brief Install an addon from the given zip path
+   \param path the zip file to install from
+   \return true if successful, false otherwise
+   \sa DoInstall
+   */
+  bool InstallFromZip(const std::string &path);
+
+   /*! Install an addon with a specific version and repository */
+  bool Install(const std::string& addonId,
+               const ADDON::CAddonVersion& version,
+               const std::string& repoId);
+
+  /*! Uninstall an addon, remove addon data if requested */
+  bool UnInstall(const ADDON::AddonPtr& addon, bool removeData);
+
+  /*! \brief Check whether dependencies of an addon exist or are installable.
+  Iterates through the addon's dependencies, checking they're installed or installable.
+  Each dependency must also satisfies CheckDependencies in turn.
+  \param addon the addon to check
+  \param database the database instance to update. Defaults to NULL.
+  \return true if dependencies are available, false otherwise.
+  */
+  bool CheckDependencies(const ADDON::AddonPtr& addon, CAddonDatabase* database = nullptr);
+
+  /*! \brief Check whether dependencies of an addon exist or are installable.
+   Iterates through the addon's dependencies, checking they're installed or installable.
+   Each dependency must also satisfies CheckDependencies in turn.
+   \param addon the addon to check
+   \param failedDep Dependency addon that isn't available
+   \param database the database instance to update. Defaults to NULL.
+   \return true if dependencies are available, false otherwise.
+   */
+  bool CheckDependencies(const ADDON::AddonPtr& addon,
+                         std::pair<std::string, std::string>& failedDep,
+                         CAddonDatabase* database = nullptr);
+
+  /*! \brief Check if an installation job for a given add-on is already queued up
+   *  \param ID The ID of the add-on
+   *  \return true if a job exists, false otherwise
+   */
+  bool HasJob(const std::string& ID) const;
+
+  void OnJobComplete(unsigned int jobID, bool success, CJob* job) override;
+  void OnJobProgress(unsigned int jobID, unsigned int progress, unsigned int total, const CJob *job) override;
+
+  class CDownloadJob
+  {
+  public:
+    explicit CDownloadJob(unsigned int id) : jobID(id) { }
+
+    unsigned int jobID;
+    unsigned int progress = 0;
+    bool downloadFinshed = false;
+  };
+
+  typedef std::map<std::string, CDownloadJob> JobMap;
+
+private:
+  // private construction, and no assignments; use the provided singleton methods
+  CAddonInstaller();
+  CAddonInstaller(const CAddonInstaller&) = delete;
+  CAddonInstaller const& operator=(CAddonInstaller const&) = delete;
+  ~CAddonInstaller() override;
+
+  /*! \brief Install an addon from a repository or zip
+   *  \param addon the AddonPtr describing the addon
+   *  \param repo the repository to install addon from
+   *  \param background whether to install in the background or not.
+   *  \param modal whether to install in modal mode or not.
+   *  \param autoUpdate whether the addon is installed in auto update mode.
+   *         (i.e. no notification)
+   *  \param dependsInstall whether this is the installation of a dependency addon
+   *  \param allowCheckForUpdates whether content update check after installation of
+   *         a repository addon is allowed
+   *  \return true on successful install, false on failure.
+   */
+  bool DoInstall(const ADDON::AddonPtr& addon,
+                 const ADDON::RepositoryPtr& repo,
+                 BackgroundJob background,
+                 ModalJob modal,
+                 AutoUpdateJob autoUpdate,
+                 DependencyJob dependsInstall,
+                 AllowCheckForUpdates allowCheckForUpdates);
+
+  /*! \brief Check whether dependencies of an addon exist or are installable.
+   Iterates through the addon's dependencies, checking they're installed or installable.
+   Each dependency must also satisfies CheckDependencies in turn.
+   \param addon the addon to check
+   \param preDeps previous dependencies encountered during recursion. aids in avoiding infinite recursion
+   \param database database instance to update
+   \param failedDep Dependency addon that isn't available
+   \return true if dependencies are available, false otherwise.
+   */
+  bool CheckDependencies(const ADDON::AddonPtr &addon, std::vector<std::string>& preDeps, CAddonDatabase &database, std::pair<std::string, std::string> &failedDep);
+
+  void PrunePackageCache();
+  int64_t EnumeratePackageFolder(std::map<std::string, std::unique_ptr<CFileItemList>>& result);
+
+  mutable CCriticalSection m_critSection;
+  JobMap m_downloadJobs;
+  CEvent m_idle;
+};
+
+}; // namespace ADDON