/**
 * @file llpresetsmanager.cpp
 * @brief Implementation for the LLPresetsManager class.
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include <boost/assign/list_of.hpp>

#include "llpresetsmanager.h"

#include "lldiriterator.h"
#include "llfloater.h"
#include "llsdserialize.h"
#include "lltrans.h"
#include "lluictrlfactory.h"
#include "llviewercontrol.h"
#include "llfloaterpreference.h"
#include "llfloaterreg.h"
#include "llfeaturemanager.h"
#include "llagentcamera.h"
#include "llfile.h"

LLPresetsManager::LLPresetsManager()
{
}

LLPresetsManager::~LLPresetsManager()
{
    mCameraChangedSignal.disconnect();
}

void LLPresetsManager::triggerChangeCameraSignal()
{
    mPresetListChangeCameraSignal();
}

void LLPresetsManager::triggerChangeSignal()
{
    mPresetListChangeSignal();
}

void LLPresetsManager::createMissingDefault(const std::string& subdirectory)
{
    if(gDirUtilp->getLindenUserDir().empty())
    {
        return;
    }

    if (PRESETS_CAMERA == subdirectory)
    {
        createCameraDefaultPresets();
        return;
    }

    std::string default_file = gDirUtilp->getExpandedFilename(LL_PATH_PER_SL_ACCOUNT, PRESETS_DIR,
        subdirectory, PRESETS_DEFAULT + ".xml");
    if (!gDirUtilp->fileExists(default_file))
    {
        LL_INFOS() << "No default preset found -- creating one at " << default_file << LL_ENDL;

        // Write current settings as the default
        savePreset(subdirectory, PRESETS_DEFAULT, true);
    }
    else
    {
        LL_DEBUGS() << "default preset exists; no-op" << LL_ENDL;
    }
}

void LLPresetsManager::createCameraDefaultPresets()
{
    bool is_default_created = createDefaultCameraPreset(PRESETS_REAR_VIEW);
    is_default_created |= createDefaultCameraPreset(PRESETS_FRONT_VIEW);
    is_default_created |= createDefaultCameraPreset(PRESETS_SIDE_VIEW);

    if (is_default_created)
    {
        triggerChangeCameraSignal();
    }
}

void LLPresetsManager::startWatching(const std::string& subdirectory)
{
    if (PRESETS_CAMERA == subdirectory)
    {
        std::vector<std::string> name_list;
        getControlNames(name_list);

        for (std::vector<std::string>::iterator it = name_list.begin(); it != name_list.end(); ++it)
        {
            std::string ctrl_name = *it;
            if (gSavedSettings.controlExists(ctrl_name))
            {
                LLPointer<LLControlVariable> cntrl_ptr = gSavedSettings.getControl(ctrl_name);
                if (cntrl_ptr.isNull())
                {
                    LL_WARNS("Init") << "Unable to set signal on global setting '" << ctrl_name
                        << "'" << LL_ENDL;
                }
                else
                {
                    mCameraChangedSignal = cntrl_ptr->getCommitSignal()->connect(boost::bind(&settingChanged));
                }
            }
        }
    }
}

std::string LLPresetsManager::getPresetsDir(const std::string& subdirectory)
{
    std::string presets_path = gDirUtilp->getExpandedFilename(LL_PATH_PER_SL_ACCOUNT, PRESETS_DIR);

    LLFile::mkdir(presets_path);

    std::string dest_path = gDirUtilp->getExpandedFilename(LL_PATH_PER_SL_ACCOUNT, PRESETS_DIR, subdirectory);
    if (!gDirUtilp->fileExists(dest_path))
        LLFile::mkdir(dest_path);

    return dest_path;
}

void LLPresetsManager::loadPresetNamesFromDir(const std::string& subdirectory, preset_name_list_t& presets, EDefaultOptions default_option)
{
    bool IS_CAMERA = (PRESETS_CAMERA == subdirectory);
    bool IS_GRAPHIC = (PRESETS_GRAPHIC == subdirectory);

    std::string dir = LLPresetsManager::getInstance()->getPresetsDir(subdirectory);
    LL_INFOS("AppInit") << "Loading list of preset names from " << dir << LL_ENDL;

    mPresetNames.clear();

    LLDirIterator dir_iter(dir, "*.xml");
    bool found = true;
    while (found)
    {
        std::string file;
        found = dir_iter.next(file);

        if (found)
        {
            std::string path = gDirUtilp->add(dir, file);
            std::string name = LLURI::unescape(gDirUtilp->getBaseFileName(path, /*strip_exten = */ true));
            LL_DEBUGS() << "  Found preset '" << name << "'" << LL_ENDL;

            if (IS_CAMERA)
            {
                if (isTemplateCameraPreset(name))
                {
                    continue;
                }
                if ((default_option == DEFAULT_HIDE) || (default_option == DEFAULT_BOTTOM))
                {
                    if (isDefaultCameraPreset(name))
                    {
                        continue;
                    }
                }
                mPresetNames.push_back(name);
            }
            if (IS_GRAPHIC)
            {
                if (PRESETS_DEFAULT != name)
                {
                    mPresetNames.push_back(name);
                }
                else
                {
                    switch (default_option)
                    {
                    case DEFAULT_SHOW:
                        mPresetNames.push_back(LLTrans::getString(PRESETS_DEFAULT));
                        break;

                    case DEFAULT_TOP:
                        mPresetNames.push_front(LLTrans::getString(PRESETS_DEFAULT));
                        break;

                    case DEFAULT_HIDE:
                    default:
                        break;
                    }
                }
            }
        }
    }

    if (IS_CAMERA)
    {
        mPresetNames.sort(LLStringUtil::precedesDict);
        if (default_option == DEFAULT_BOTTOM)
        {
            mPresetNames.push_back(PRESETS_FRONT_VIEW);
            mPresetNames.push_back(PRESETS_REAR_VIEW);
            mPresetNames.push_back(PRESETS_SIDE_VIEW);
        }
    }

    presets = mPresetNames;
}

bool LLPresetsManager::mCameraDirty = false;
bool LLPresetsManager::mIgnoreChangedSignal = false;

void LLPresetsManager::setCameraDirty(bool dirty)
{
    mCameraDirty = dirty;
}

bool LLPresetsManager::isCameraDirty()
{
    return mCameraDirty;
}

void LLPresetsManager::settingChanged()
{
    setCameraDirty(true);

    static LLCachedControl<std::string> preset_camera_active(gSavedSettings, "PresetCameraActive", "");
    std::string preset_name = preset_camera_active;
    if (!preset_name.empty() && !mIgnoreChangedSignal)
    {
        gSavedSettings.setString("PresetCameraActive", "");

        // Hack call because this is a static routine
        LLPresetsManager::getInstance()->triggerChangeCameraSignal();
    }
}

void LLPresetsManager::getControlNames(std::vector<std::string>& names)
{
    const std::vector<std::string> camera_controls = boost::assign::list_of
        // From panel_preferences_move.xml
        ("CameraAngle")
        ("CameraOffsetScale")
        // From llagentcamera.cpp
        ("CameraOffsetBuild")
        ("TrackFocusObject")
        ("CameraOffsetRearView")
        ("FocusOffsetRearView")
        ("AvatarSitRotation")
        ;
    names = camera_controls;
}

bool LLPresetsManager::savePreset(const std::string& subdirectory, std::string name, bool createDefault)
{
    bool IS_CAMERA = (PRESETS_CAMERA == subdirectory);
    bool IS_GRAPHIC = (PRESETS_GRAPHIC == subdirectory);

    if (LLTrans::getString(PRESETS_DEFAULT) == name)
    {
        name = PRESETS_DEFAULT;
    }
    if (!createDefault && name == PRESETS_DEFAULT)
    {
        LL_WARNS() << "Should not overwrite default" << LL_ENDL;
        return false;
    }

    if (isTemplateCameraPreset(name))
    {
        LL_WARNS() << "Should not overwrite template presets" << LL_ENDL;
        return false;
    }

    bool saved = false;
    std::vector<std::string> name_list;

    if (IS_GRAPHIC)
    {
        LLFloaterPreference* instance = LLFloaterReg::findTypedInstance<LLFloaterPreference>("preferences");
        if (instance && !createDefault)
        {
            gSavedSettings.setString("PresetGraphicActive", name);
            instance->getControlNames(name_list);
            LL_DEBUGS() << "saving preset '" << name << "'; " << name_list.size() << " names" << LL_ENDL;
            name_list.push_back("PresetGraphicActive");
        }
        else
        {
            LL_WARNS("Presets") << "preferences floater instance not found" << LL_ENDL;
        }
    }
    else if (IS_CAMERA)
    {
        name_list.clear();
        getControlNames(name_list);
        name_list.push_back("PresetCameraActive");
    }
    else
    {
        LL_ERRS() << "Invalid presets directory '" << subdirectory << "'" << LL_ENDL;
    }

    // make an empty llsd
    LLSD paramsData(LLSD::emptyMap());

    // Create a default graphics preset from hw recommended settings
    if (IS_GRAPHIC && createDefault && name == PRESETS_DEFAULT)
    {
        paramsData = LLFeatureManager::getInstance()->getRecommendedSettingsMap();
        if (gSavedSettings.getU32("RenderAvatarMaxComplexity") == 0)
        {
            // use the recommended setting as an initial one (MAINT-6435)
            gSavedSettings.setU32("RenderAvatarMaxComplexity", paramsData["RenderAvatarMaxComplexity"]["Value"].asInteger());
        }
    }
    else
    {
        ECameraPreset new_camera_preset = (ECameraPreset)gSavedSettings.getU32("CameraPresetType");
        if (IS_CAMERA)
        {
            if (isDefaultCameraPreset(name))
            {
                if (PRESETS_REAR_VIEW == name)
                {
                    new_camera_preset = CAMERA_PRESET_REAR_VIEW;
                }
                else if (PRESETS_SIDE_VIEW == name)
                {
                    new_camera_preset = CAMERA_PRESET_GROUP_VIEW;
                }
                else if (PRESETS_FRONT_VIEW == name)
                {
                    new_camera_preset = CAMERA_PRESET_FRONT_VIEW;
                }
            }
            else
            {
                new_camera_preset = CAMERA_PRESET_CUSTOM;
            }
        }
        for (std::vector<std::string>::iterator it = name_list.begin(); it != name_list.end(); ++it)
        {
            std::string ctrl_name = *it;

            LLControlVariable* ctrl = gSavedSettings.getControl(ctrl_name).get();
            if (ctrl)
            {
                std::string comment = ctrl->getComment();
                std::string type = LLControlGroup::typeEnumToString(ctrl->type());
                LLSD value = ctrl->getValue();

                paramsData[ctrl_name]["Comment"] = comment;
                paramsData[ctrl_name]["Persist"] = 1;
                paramsData[ctrl_name]["Type"] = type;
                paramsData[ctrl_name]["Value"] = value;
            }
        }
        if (IS_CAMERA)
        {
            gSavedSettings.setU32("CameraPresetType", new_camera_preset);
        }
    }

    std::string pathName(getPresetsDir(subdirectory) + gDirUtilp->getDirDelimiter() + LLURI::escape(name) + ".xml");

 // If the active preset name is the only thing in the list, don't save the list
    if (paramsData.size() > 1)
    {
        // write to file
        llofstream presetsXML(pathName.c_str());
        if (presetsXML.is_open())
        {
            LLPointer<LLSDFormatter> formatter = new LLSDXMLFormatter();
            formatter->format(paramsData, presetsXML, LLSDFormatter::OPTIONS_PRETTY);
            presetsXML.close();
            saved = true;

            LL_DEBUGS() << "saved preset '" << name << "'; " << paramsData.size() << " parameters" << LL_ENDL;

            if (IS_GRAPHIC)
            {
                gSavedSettings.setString("PresetGraphicActive", name);
                // signal interested parties
                triggerChangeSignal();
            }

            if (IS_CAMERA)
            {
                gSavedSettings.setString("PresetCameraActive", name);
                setCameraDirty(false);
                // signal interested parties
                triggerChangeCameraSignal();
            }
        }
        else
        {
            LL_WARNS("Presets") << "Cannot open for output preset file " << pathName << LL_ENDL;
        }
    }
    else
    {
        LL_INFOS() << "No settings available to be saved" << LL_ENDL;
    }

    return saved;
}

bool LLPresetsManager::setPresetNamesInComboBox(const std::string& subdirectory, LLComboBox* combo, EDefaultOptions default_option)
{
    bool sts = true;

    combo->clearRows();
    combo->setEnabled(true);

    std::list<std::string> preset_names;
    loadPresetNamesFromDir(subdirectory, preset_names, default_option);

    if (preset_names.begin() != preset_names.end())
    {
        for (std::list<std::string>::const_iterator it = preset_names.begin(); it != preset_names.end(); ++it)
        {
            const std::string& name = *it;
            combo->add(name, name);
        }
    }
    else
    {
        combo->setLabel(LLTrans::getString("preset_combo_label"));
        combo->setEnabled(PRESETS_CAMERA != subdirectory);
        sts = false;
    }

    return sts;
}

void LLPresetsManager::loadPreset(const std::string& subdirectory, std::string name)
{
    if (LLTrans::getString(PRESETS_DEFAULT) == name)
    {
        name = PRESETS_DEFAULT;
    }

    std::string full_path(getPresetsDir(subdirectory) + gDirUtilp->getDirDelimiter() + LLURI::escape(name) + ".xml");

    LL_DEBUGS() << "attempting to load preset '"<<name<<"' from '"<<full_path<<"'" << LL_ENDL;

    bool appearance_camera_movement = gSavedSettings.getBOOL("AppearanceCameraMovement");
    bool edit_camera_movement = gSavedSettings.getBOOL("EditCameraMovement");

    mIgnoreChangedSignal = true;
    if(gSavedSettings.loadFromFile(full_path, false, true) > 0)
    {
        mIgnoreChangedSignal = false;
        if(PRESETS_GRAPHIC == subdirectory)
        {
            gSavedSettings.setString("PresetGraphicActive", name);

            LLFloaterPreference* instance = LLFloaterReg::findTypedInstance<LLFloaterPreference>("preferences");
            if (instance)
            {
                instance->refreshEnabledGraphics();
            }
            triggerChangeSignal();
        }
        if(PRESETS_CAMERA == subdirectory)
        {
            gSavedSettings.setString("PresetCameraActive", name);
            triggerChangeCameraSignal();

            //SL-20277 old preset files may contain settings that should be ignored when loading camera presets
            if (appearance_camera_movement != (bool)gSavedSettings.getBOOL("AppearanceCameraMovement"))
            {
                gSavedSettings.setBOOL("AppearanceCameraMovement", appearance_camera_movement);
            }
            if (edit_camera_movement != (bool)gSavedSettings.getBOOL("EditCameraMovement"))
            {
                gSavedSettings.setBOOL("EditCameraMovement", edit_camera_movement);
            }
        }
    }
    else
    {
        mIgnoreChangedSignal = false;
        LL_WARNS("Presets") << "failed to load preset '"<<name<<"' from '"<<full_path<<"'" << LL_ENDL;
    }
}

bool LLPresetsManager::deletePreset(const std::string& subdirectory, std::string name)
{
    if (LLTrans::getString(PRESETS_DEFAULT) == name)
    {
        name = PRESETS_DEFAULT;
    }

    bool sts = true;

    if (PRESETS_DEFAULT == name)
    {
        // This code should never execute
        LL_WARNS("Presets") << "You are not allowed to delete the default preset." << LL_ENDL;
        sts = false;
    }

    if (gDirUtilp->deleteFilesInDir(getPresetsDir(subdirectory), LLURI::escape(name) + ".xml") < 1)
    {
        LL_WARNS("Presets") << "Error removing preset " << name << " from disk" << LL_ENDL;
        sts = false;
    }

    // If you delete the preset that is currently marked as loaded then also indicate that no preset is loaded.
    if(PRESETS_GRAPHIC == subdirectory)
    {
        if (gSavedSettings.getString("PresetGraphicActive") == name)
        {
            gSavedSettings.setString("PresetGraphicActive", "");
        }
        // signal interested parties
        triggerChangeSignal();
    }

    if(PRESETS_CAMERA == subdirectory)
    {
        if (gSavedSettings.getString("PresetCameraActive") == name)
        {
            gSavedSettings.setString("PresetCameraActive", "");
        }
        // signal interested parties
        triggerChangeCameraSignal();
    }

    return sts;
}

bool LLPresetsManager::isDefaultCameraPreset(std::string preset_name)
{
    return (preset_name == PRESETS_REAR_VIEW || preset_name == PRESETS_SIDE_VIEW || preset_name == PRESETS_FRONT_VIEW);
}

bool LLPresetsManager::isTemplateCameraPreset(std::string preset_name)
{
    return (preset_name == PRESETS_REAR || preset_name == PRESETS_SIDE || preset_name == PRESETS_FRONT);
}

void LLPresetsManager::resetCameraPreset(std::string preset_name)
{
    if (isDefaultCameraPreset(preset_name))
    {
        createDefaultCameraPreset(preset_name, true);

        if (gSavedSettings.getString("PresetCameraActive") == preset_name)
        {
            loadPreset(PRESETS_CAMERA, preset_name);
        }
    }
}

bool LLPresetsManager::createDefaultCameraPreset(std::string preset_name, bool force_reset)
{
    std::string preset_file = gDirUtilp->getExpandedFilename(LL_PATH_PER_SL_ACCOUNT, PRESETS_DIR,
        PRESETS_CAMERA, LLURI::escape(preset_name) + ".xml");
    if (!gDirUtilp->fileExists(preset_file) || force_reset)
    {
        std::string template_name = preset_name.substr(0, preset_name.size() - PRESETS_VIEW_SUFFIX.size());
        std::string default_template_file = gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, PRESETS_CAMERA, template_name + ".xml");
        return LLFile::copy(default_template_file, preset_file);
    }
    return false;
}

boost::signals2::connection LLPresetsManager::setPresetListChangeCameraCallback(const preset_list_signal_t::slot_type& cb)
{
    return mPresetListChangeCameraSignal.connect(cb);
}

boost::signals2::connection LLPresetsManager::setPresetListChangeCallback(const preset_list_signal_t::slot_type& cb)
{
    return mPresetListChangeSignal.connect(cb);
}