// Written by James Turner, started 2017.
//
// Copyright (C) 2017  James Turner
//
// This program 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 2 of the
// License, or (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

#include "config.h"

#include "unitTestHelpers.hxx"

#include <simgear/misc/test_macros.hxx>
#include <simgear/props/props_io.hxx>
#include <simgear/io/iostreams/sgstream.hxx>
#include <simgear/misc/sg_dir.hxx>

#include "Main/globals.hxx"
#include "Main/options.hxx"
#include "Main/fg_props.hxx"

using namespace flightgear;

void writeLegacyAutosave(SGPath userData, int majorVersion, int minorVersion)
{
    std::ostringstream os;
    os << "autosave_" << majorVersion << "_" << minorVersion << ".xml";

    sg_ofstream of(userData / os.str());
    {
        of << "<?xml version=\"1.0\"?>" \
            "<PropertyList>" \
            "<sim>" \
            "<window-height>42</window-height>" \
            "<presets>" \
            "<foo>12</foo>" \
            "<child><bar>12</bar></child>" \
            "</presets>" \
            "<presets n=\"1\">" \
            "<foo>13</foo>" \
            "</presets>" \
            "<rendering>" \
            "<msaa>10</msaa>" \
            "<texture-size>512</texture-size>" \
            "<texture-pack>" \
            "<foo>abc</foo>" \
            "<wibble>abc</wibble>" \
            "</texture-pack>" \
            "</rendering>" \
            "<gui>" \
            "<dialog n=\"1\">" \
            "<widget>button</widget>" \
            "</dialog>" \
            "<dialog n=\"2\">" \
            "<widget>slider</widget>" \
            "</dialog>"\
            "</gui>" \
            "</sim>" \
            "<some-setting>888</some-setting>" \
            "<views>" \
            "<view>" \
            "<new-prop>somevalue</new-prop>" \
            "<old-prop>somevalue</old-prop>" \
            "</view>" \
            "</views>" \
            "</PropertyList>";

    }
    of.close();
}

void writeLegacyAutosave2(SGPath userData, int majorVersion, int minorVersion)
{
    std::ostringstream os;
    os << "autosave_" << majorVersion << "_" << minorVersion << ".xml";

    sg_ofstream of(userData / os.str());
    {
        of << "<?xml version=\"1.0\"?>" \
        "<PropertyList>" \
        "<sim>" \
        "<bad>1</bad>" \
        "</sim>" \
        "</views>" \
        "</PropertyList>";

    }
    of.close();
}

void testMigration()
{
    fgtest::initTestGlobals("autosaveMigration");

    Options::reset();

    SGPath testUserDataPath = globals->get_fg_home() / "test_autosave_migrate";
    if (!testUserDataPath.exists()) {
        SGPath p = testUserDataPath / "foo";
        p.create_dir(0755);
    }

    simgear::Dir homeDir(testUserDataPath);
    for (auto path : homeDir.children(simgear::Dir::TYPE_FILE, ".xml")) {
        path.remove();
    }

    writeLegacyAutosave(testUserDataPath, 2016, 1);

    const string_list versionParts = simgear::strutils::split(VERSION, ".");
    SG_VERIFY(versionParts.size() == 3);
    const int currentMajor = simgear::strutils::to_int(versionParts[0]);
    const int currentMinor = simgear::strutils::to_int(versionParts[1]);

    // none of these should not be read
    writeLegacyAutosave2(testUserDataPath, 2016, 0);
    writeLegacyAutosave2(testUserDataPath, currentMajor, currentMinor + 1);
    writeLegacyAutosave2(testUserDataPath, currentMajor+1, currentMinor + 1);

    SGPath p = globals->autosaveFilePath(testUserDataPath);
    if (p.exists()) {
        SG_VERIFY(p.remove());
    }

    // write some blck-list rules to property tree
    SGPropertyNode_ptr blacklist = fgGetNode("/sim/autosave-migration/blacklist", true);
    blacklist->addChild("path")->setStringValue("/sim[0]/presets[0]/*");
    blacklist->addChild("path")->setStringValue("/sim[0]/rendering[0]/texture-");
    blacklist->addChild("path")->setStringValue("/views[0]/view[*]/old-prop");
    blacklist->addChild("path")->setStringValue("/sim[0]/gui");

    // execute method under test
    globals->loadUserSettings(testUserDataPath, true /* try migration */);

    SG_CHECK_EQUAL(globals->get_props()->getNode("sim")->getChildren("presets").size(), 2);
    SG_CHECK_EQUAL(globals->get_props()->getNode("sim")->getChildren("gui").size(), 0);

    SG_CHECK_EQUAL(globals->get_props()->getIntValue("sim/window-height"), 42);
    SG_CHECK_EQUAL(globals->get_props()->getIntValue("sim/presets/foo"), 0);
    SG_CHECK_EQUAL(globals->get_props()->getIntValue("sim/presets[1]/foo"), 13);

    SG_CHECK_EQUAL(globals->get_props()->getIntValue("some-setting"), 888);

    // if this is not zero, one of the bad autosaves was read
    SG_CHECK_EQUAL(globals->get_props()->getIntValue("sim/bad"), 0);


    fgtest::shutdownTestGlobals();
}

int main(int argc, char* argv[])
{
    testMigration();
    return EXIT_SUCCESS;
}