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#include "clangfilesystemwatcher.h"

#include "translationunits.h"

#include <utf8stringvector.h>

#include <QStringList>

#include <algorithm>
#include <iterator>

namespace ClangBackEnd {

namespace {
QStringList toStringList(const QSet<Utf8String> &files)
{
    QStringList resultList;

    std::copy(files.cbegin(), files.cend(), std::back_inserter(resultList));

    return resultList;
}
}

ClangFileSystemWatcher::ClangFileSystemWatcher(TranslationUnits &translationUnits)
    : translationUnits(translationUnits)
{
    connect(&watcher,
            &QFileSystemWatcher::fileChanged,
            this,
            &ClangFileSystemWatcher::updateTranslationUnitsWithChangedDependencies);

    connect(&changedDiagnosticsTimer,
            &QTimer::timeout,
            this,
            &ClangFileSystemWatcher::sendChangedDiagnostics);

    changedDiagnosticsTimer.setSingleShot(true);
    changedDiagnosticsTimer.setInterval(100);
}

void ClangFileSystemWatcher::addFiles(const QSet<Utf8String> &filePaths)
{
    watcher.addPaths(toStringList(filePaths));
}

void ClangFileSystemWatcher::updateTranslationUnitsWithChangedDependencies(const QString &filePath)
{
    translationUnits.updateTranslationUnitsWithChangedDependencies(filePath);
    changedDiagnosticsTimer.start();
    watcher.addPath(filePath);
}

void ClangFileSystemWatcher::sendChangedDiagnostics()
{
    translationUnits.sendChangedDiagnostics();
}

} // namespace ClangBackEnd