/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

static StringArray readDeadMansPedalFile (const File& file)
{
    StringArray lines;
    file.readLines (lines);
    lines.removeEmptyStrings();
    return lines;
}

PluginDirectoryScanner::PluginDirectoryScanner (KnownPluginList& listToAddTo,
                                                AudioPluginFormat& formatToLookFor,
                                                FileSearchPath directoriesToSearch,
                                                const bool recursive,
                                                const File& deadMansPedal,
                                                bool allowPluginsWhichRequireAsynchronousInstantiation)
    : list (listToAddTo),
      format (formatToLookFor),
      deadMansPedalFile (deadMansPedal),
      allowAsync (allowPluginsWhichRequireAsynchronousInstantiation)
{
    directoriesToSearch.removeRedundantPaths();
    setFilesOrIdentifiersToScan (format.searchPathsForPlugins (directoriesToSearch, recursive, allowAsync));
}

PluginDirectoryScanner::~PluginDirectoryScanner()
{
    list.scanFinished();
}

//==============================================================================
void PluginDirectoryScanner::setFilesOrIdentifiersToScan (const StringArray& filesOrIdentifiers)
{
    filesOrIdentifiersToScan = filesOrIdentifiers;

    // If any plugins have crashed recently when being loaded, move them to the
    // end of the list to give the others a chance to load correctly.
    for (auto& crashed : readDeadMansPedalFile (deadMansPedalFile))
        for (int j = filesOrIdentifiersToScan.size(); --j >= 0;)
            if (crashed == filesOrIdentifiersToScan[j])
                filesOrIdentifiersToScan.move (j, -1);

    applyBlacklistingsFromDeadMansPedal (list, deadMansPedalFile);
    nextIndex.set (filesOrIdentifiersToScan.size());
}

String PluginDirectoryScanner::getNextPluginFileThatWillBeScanned() const
{
    return format.getNameOfPluginFromIdentifier (filesOrIdentifiersToScan [nextIndex.get() - 1]);
}

void PluginDirectoryScanner::updateProgress()
{
    progress = (1.0f - (float) nextIndex.get() / (float) filesOrIdentifiersToScan.size());
}

bool PluginDirectoryScanner::scanNextFile (bool dontRescanIfAlreadyInList,
                                           String& nameOfPluginBeingScanned)
{
    const int index = --nextIndex;

    if (index >= 0)
    {
        auto file = filesOrIdentifiersToScan [index];

        if (file.isNotEmpty() && ! (dontRescanIfAlreadyInList && list.isListingUpToDate (file, format)))
        {
            nameOfPluginBeingScanned = format.getNameOfPluginFromIdentifier (file);

            OwnedArray<PluginDescription> typesFound;

            // Add this plugin to the end of the dead-man's pedal list in case it crashes...
            auto crashedPlugins = readDeadMansPedalFile (deadMansPedalFile);
            crashedPlugins.removeString (file);
            crashedPlugins.add (file);
            setDeadMansPedalFile (crashedPlugins);

            list.scanAndAddFile (file, dontRescanIfAlreadyInList, typesFound, format);

            // Managed to load without crashing, so remove it from the dead-man's-pedal.
            crashedPlugins.removeString (file);
            setDeadMansPedalFile (crashedPlugins);

            if (typesFound.size() == 0 && ! list.getBlacklistedFiles().contains (file))
                failedFiles.add (file);
        }
    }

    updateProgress();
    return index > 0;
}

bool PluginDirectoryScanner::skipNextFile()
{
    updateProgress();
    return --nextIndex > 0;
}

void PluginDirectoryScanner::setDeadMansPedalFile (const StringArray& newContents)
{
    if (deadMansPedalFile.getFullPathName().isNotEmpty())
        deadMansPedalFile.replaceWithText (newContents.joinIntoString ("\n"), true, true);
}

void PluginDirectoryScanner::applyBlacklistingsFromDeadMansPedal (KnownPluginList& list, const File& file)
{
    // If any plugins have crashed recently when being loaded, move them to the
    // end of the list to give the others a chance to load correctly.
    for (auto& crashedPlugin : readDeadMansPedalFile (file))
        list.addToBlacklist (crashedPlugin);
}

} // namespace juce
