/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.

This file is part of Mod Organizer.

Mod Organizer is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Mod Organizer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PROFILE_H
#define PROFILE_H

#include "executableinfo.h"
#include "modinfo.h"
#include <delayedfilewriter.h>
#include <iprofile.h>

#include <QByteArray>
#include <QDir>
#include <QList>
#include <QObject>
#include <QSettings>
#include <QString>

#include <boost/shared_ptr.hpp>

#include <string>
#include <tuple>
#include <vector>

namespace MOBase
{
class IPluginGame;
}

class GameFeatures;

/**
 * @brief represents a profile
 **/
class Profile : public QObject, public MOBase::IProfile
{

  Q_OBJECT

public:
  using Ptr = boost::shared_ptr<Profile>;

public:
  // the minimum and maximum priority achievable by mods
  //
  static constexpr int MinimumPriority = 0;
  static constexpr int MaximumPriority = std::numeric_limits<int>::max();

public:
  /**
   * @brief constructor
   *
   * This constructor is used to create a new profile so it is to be assumed a profile
   * by this name does not yet exist
   * @param name name of the new profile
   * @param filter save game filter. Defaults to &lt;no filter&gt;.
   **/
  Profile(const QString& name, MOBase::IPluginGame const* gamePlugin,
          GameFeatures const& features, bool useDefaultSettings);

  /**
   * @brief constructor
   *
   * This constructor is used to open an existing profile though it will also try to
   *repair the profile if important files are missing (including the directory itself)
   *so technically, invoking this should always produce a working profile
   * @param directory directory to read the profile from
   **/
  Profile(const QDir& directory, MOBase::IPluginGame const* gamePlugin,
          GameFeatures const& features);

  Profile(const Profile& reference);

  ~Profile();

  /**
   * Determines the default settings for the profile based on the current state of the
   *profile's files.  This function should remain backwards compatible as much as
   *possible.
   **/

  void findProfileSettings(void);

  /**
   * @return true if this profile (still) exists on disc
   */
  bool exists() const;

  /**
   * @param name of the new profile
   * @param reference profile to copy from
   **/
  static Profile* createPtrFrom(const QString& name, const Profile& reference,
                                MOBase::IPluginGame const* gamePlugin);

  static void renameModInAllProfiles(const QString& oldName, const QString& newName);

  void writeModlist();

  void writeModlistNow(bool onlyIfPending = false);

  void cancelModlistWrite();

  /**
   * @brief test if this profile uses archive invalidation
   *
   * @param supported if this is not null, the parameter will be set to false if
   *invalidation is not supported in this profile
   * @return true if archive invalidation is active
   * @note currently, invalidation is not supported if the relevant entry in the ini
   *file does not exist
   **/
  bool invalidationActive(bool* supported) const;

  /**
   * @brief deactivate archive invalidation if it was active
   **/
  void deactivateInvalidation();

  /**
   * @brief activate archive invalidation
   **/
  void activateInvalidation();

  /**
   * @return true if this profile uses local save games
   */
  virtual bool localSavesEnabled() const override;

  /**
   * @brief enables or disables the use of local save games for this profile
   * when disabling the user will be asked if he wants to remove the save games
   * in the profile
   * @param enable if true, local saves are enabled, otherewise they are disabled
   */
  bool enableLocalSaves(bool enable);

  /**
   * @return true if this profile uses local ini files
   */
  virtual bool localSettingsEnabled() const override;

  /**
   * @brief enables or disables the use of local ini files for this profile
   * disabling this does not delete existing ini files but the global ones will be used
   * @param enable
   */
  bool enableLocalSettings(bool enable);

  /**
   * @return name of the profile (this is identical to its directory name)
   **/
  virtual QString name() const override { return m_Directory.dirName(); }

  /**
   * @return the path of the plugins file in this profile
   * @todo is this required? can the functionality using this function be moved to the
   *Profile-class?
   **/
  QString getPluginsFileName() const;

  /**
   * @return the path of the loadorder file in this profile
   **/
  QString getLoadOrderFileName() const;

  /**
   * @return the path of the file containing locked mod indices
   */
  QString getLockedOrderFileName() const;

  /**
   * @return the path of the modlist file in this profile
   */
  QString getModlistFileName() const;

  /**
   * @return path of the archives file in this profile
   */
  QString getArchivesFileName() const;

  /**
   * @return the path of the ini file in this profile
   * @todo since the game can contain multiple ini files (i.e. skyrim.ini
   *skyrimprefs.ini) the concept of this function is somewhat broken
   **/
  QString getIniFileName() const;

  /**
   * @brief Retrieve the absolute file to the corresponding file.
   *
   * @param iniFile INI file to retrieve a path for. This can either be the
   *     name of a file or a path to the absolute file outside of the profile.
   *
   * @return the absolute path for the given INI file for this profile.
   */
  QString absoluteIniFilePath(QString iniFile) const override;

  /**
   * @return the path of the tweak ini in this profile
   */
  QString getProfileTweaks() const;

  /**
   * @return path to this profile
   **/
  virtual QString absolutePath() const override;

  /**
   * @return path to this profile's save games
   **/
  QString savePath() const;

  /**
   * @brief rename profile
   * @param newName new name of profile
   */
  void rename(const QString& newName);

  /**
   * @brief create the ini file to be used by the game
   *
   * the tweaked ini file constructed by this file is a merger
   * of the game-ini of this profile with ini tweaks applied */
  void createTweakedIniFile();

  /**
   * @brief re-read the modlist.txt and update the mod status from it
   **/
  void refreshModStatus();

  /**
   * @brief retrieve a list of mods that are enabled in this profile
   *
   * @return list of active mods sorted by priority (ascending). "first" is the mod
   *name, "second" is its path
   **/
  std::vector<std::tuple<QString, QString, int>> getActiveMods();

  /**
   * @brief retrieve a mod of the indexes ordered by priority
   *
   * @return map of indexes by priority
   **/
  const std::map<int, unsigned int>& getAllIndexesByPriority()
  {
    return m_ModIndexByPriority;
  }

  /**
   * retrieve the number of mods for which this object has status information.
   * This is usually the same as ModInfo::getNumMods() except between
   * calls to ModInfo::updateFromDisc() and the Profile::refreshModStatus()
   *
   * @return number of mods for which the profile has status information
   **/
  size_t numMods() const { return m_ModStatus.size(); }

  /**
   * @brief enable or disable a mod
   *
   * @param index index of the mod to enable/disable
   * @param enabled true if the mod is to be enabled, false if it is to be disabled
   **/
  void setModEnabled(unsigned int index, bool enabled);

  /**
   * @brief enable or disable multiple mods at once
   * This is an abbreviated process and should be immediately followed by a full refresh
   * to maintain data consistency.
   *
   * @param modsToEnable list of mod indicies to enable
   * @param modsToDisable list of mod indicies to disable
   **/
  void setModsEnabled(const QList<unsigned int>& modsToEnable,
                      const QList<unsigned int>& modsToDisable);

  // set the priority of a mod, and the priority of other mods in the range
  // [old priority, new priority] such that no gaps are possible
  //
  // the priority is clamped in the range of valid priority (>= 0, and lower than
  // the number of "regular" mods), you should use MinimumPriority or MaximumPriority
  // to send a mod to the "top" or "bottom" of the priority list
  //
  // the function returns true if the priority was changed, or false if the mod
  // was already at the given priority (or if the priority of the mod cannot be
  // set)
  //
  bool setModPriority(unsigned int index, int& newPriority);

  /**
   * @brief determine if a mod is enabled
   *
   * @param index index of the mod to look up
   * @return true if the mod is enabled, false otherwise
   **/
  bool modEnabled(unsigned int index) const;

  /**
   * @brief query the priority of a mod
   *
   * @param index index of the mod to look up
   * @return priority of the specified mod
   **/
  int getModPriority(unsigned int index) const;

  void dumpModStatus() const;

  QVariant setting(const QString& section, const QString& name,
                   const QVariant& fallback = {}) const;

  void storeSetting(const QString& section, const QString& name,
                    const QVariant& value = {});

  void removeSetting(const QString& section, const QString& name);

  QVariantMap settingsByGroup(const QString& section) const;
  void storeSettingsByGroup(const QString& section, const QVariantMap& values);

  QList<QVariantMap> settingsByArray(const QString& prefix) const;
  void storeSettingsByArray(const QString& prefix, const QList<QVariantMap>& values);

  bool forcedLibrariesEnabled(const QString& executable) const;
  void setForcedLibrariesEnabled(const QString& executable, bool enabled);
  QList<MOBase::ExecutableForcedLoadSetting>
  determineForcedLibraries(const QString& executable) const;
  void storeForcedLibraries(const QString& executable,
                            const QList<MOBase::ExecutableForcedLoadSetting>& values);
  void removeForcedLibraries(const QString& executable);

  void debugDump() const;

  Profile& operator=(const Profile& reference) = delete;

signals:

  /**
   * @brief emitted whenever the status (enabled/disabled) of a mod changed
   *
   * @param index index of the mod that changed
   **/
  void modStatusChanged(unsigned int index);

  /**
   * @brief emitted whenever the status (enabled/disabled) of multiple mods change
   *
   * @param index list of indices of the mods that changed
   **/
  void modStatusChanged(QList<unsigned int> index);

protected slots:

  // should only be called by DelayedFileWriter, use writeModlist() and
  // writeModlistNow() instead
  void doWriteModlist();

private:
  class ModStatus
  {
    friend class Profile;

  public:
    ModStatus() : m_Enabled(false), m_Priority(-1) {}

  private:
    bool m_Enabled;
    int m_Priority;
  };

private:
  void updateIndices();

  void copyFilesTo(QString& target) const;

  std::vector<std::wstring> splitDZString(const wchar_t* buffer) const;
  void mergeTweak(const QString& tweakName, const QString& tweakedIni) const;
  void mergeTweaks(ModInfo::Ptr modInfo, const QString& tweakedIni) const;
  void touchFile(QString fileName);

  static void renameModInList(QFile& modList, const QString& oldName,
                              const QString& newName);

private:
  QDir m_Directory;

  QSettings* m_Settings;

  const GameFeatures& m_GameFeatures;
  const MOBase::IPluginGame* m_GamePlugin;

  std::vector<ModStatus> m_ModStatus;
  std::map<int, unsigned int> m_ModIndexByPriority;

  // "regular" here means mods with modifiable priority (i.e. not backups
  // or overwrite)
  std::size_t m_NumRegularMods;

  MOBase::DelayedFileWriter m_ModListWriter;
};

#endif  // PROFILE_H