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

   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
{

//==============================================================================
class FileChooser::NonNative final : public std::enable_shared_from_this<NonNative>,
                                     public FileChooser::Pimpl
{
public:
    NonNative (FileChooser& fileChooser, int flags, FilePreviewComponent* preview)
        : owner (fileChooser),
          selectsDirectories ((flags & FileBrowserComponent::canSelectDirectories)   != 0),
          selectsFiles       ((flags & FileBrowserComponent::canSelectFiles)         != 0),
          warnAboutOverwrite ((flags & FileBrowserComponent::warnAboutOverwriting)   != 0),

          filter (selectsFiles ? owner.filters : String(), selectsDirectories ? "*" : String(), {}),
          browserComponent (flags, owner.startingFile, &filter, preview),
          dialogBox (owner.title, {}, browserComponent, warnAboutOverwrite,
                     browserComponent.findColour (AlertWindow::backgroundColourId), owner.parent)
    {}

    ~NonNative() override
    {
        dialogBox.exitModalState (0);
    }

    void launch() override
    {
        dialogBox.centreWithDefaultSize (nullptr);

        const std::weak_ptr<NonNative> ref (shared_from_this());
        auto* callback = ModalCallbackFunction::create ([ref] (int r)
        {
            if (auto locked = ref.lock())
                locked->modalStateFinished (r);
        });

        dialogBox.enterModalState (true, callback, true);
    }

    void runModally() override
    {
       #if JUCE_MODAL_LOOPS_PERMITTED
        modalStateFinished (dialogBox.show() ? 1 : 0);
       #else
        jassertfalse;
       #endif
    }

private:
    void modalStateFinished (int returnValue)
    {
        Array<URL> result;

        if (returnValue != 0)
        {
            for (int i = 0; i < browserComponent.getNumSelectedFiles(); ++i)
                result.add (URL (browserComponent.getSelectedFile (i)));
        }

        owner.finished (result);
    }

    //==============================================================================
    FileChooser& owner;
    bool selectsDirectories, selectsFiles, warnAboutOverwrite;

    WildcardFileFilter filter;
    FileBrowserComponent browserComponent;
    FileChooserDialogBox dialogBox;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NonNative)
};

//==============================================================================
FileChooser::FileChooser (const String& chooserBoxTitle,
                          const File& currentFileOrDirectory,
                          const String& fileFilters,
                          const bool useNativeBox,
                          const bool treatFilePackagesAsDirectories,
                          Component* parentComponentToUse)
    : title (chooserBoxTitle),
      filters (fileFilters),
      startingFile (currentFileOrDirectory),
      parent (parentComponentToUse),
      useNativeDialogBox (useNativeBox && isPlatformDialogAvailable()),
      treatFilePackagesAsDirs (treatFilePackagesAsDirectories)
{
   #ifndef JUCE_MAC
    ignoreUnused (treatFilePackagesAsDirs);
   #endif

    if (! fileFilters.containsNonWhitespaceChars())
        filters = "*";
}

FileChooser::~FileChooser()
{
    asyncCallback = nullptr;
}

#if JUCE_MODAL_LOOPS_PERMITTED
bool FileChooser::browseForFileToOpen (FilePreviewComponent* previewComp)
{
    return showDialog (FileBrowserComponent::openMode
                        | FileBrowserComponent::canSelectFiles,
                       previewComp);
}

bool FileChooser::browseForMultipleFilesToOpen (FilePreviewComponent* previewComp)
{
    return showDialog (FileBrowserComponent::openMode
                        | FileBrowserComponent::canSelectFiles
                        | FileBrowserComponent::canSelectMultipleItems,
                       previewComp);
}

bool FileChooser::browseForMultipleFilesOrDirectories (FilePreviewComponent* previewComp)
{
    return showDialog (FileBrowserComponent::openMode
                        | FileBrowserComponent::canSelectFiles
                        | FileBrowserComponent::canSelectDirectories
                        | FileBrowserComponent::canSelectMultipleItems,
                       previewComp);
}

bool FileChooser::browseForFileToSave (const bool warnAboutOverwrite)
{
    return showDialog (FileBrowserComponent::saveMode
                        | FileBrowserComponent::canSelectFiles
                        | (warnAboutOverwrite ? FileBrowserComponent::warnAboutOverwriting : 0),
                       nullptr);
}

bool FileChooser::browseForDirectory()
{
    return showDialog (FileBrowserComponent::openMode
                        | FileBrowserComponent::canSelectDirectories,
                       nullptr);
}

bool FileChooser::showDialog (const int flags, FilePreviewComponent* const previewComp)
{
    detail::FocusRestorer focusRestorer;

    pimpl = createPimpl (flags, previewComp);
    pimpl->runModally();

    // ensure that the finished function was invoked
    jassert (pimpl == nullptr);

    return (results.size() > 0);
}
#endif

void FileChooser::launchAsync (int flags, std::function<void (const FileChooser&)> callback,
                               FilePreviewComponent* previewComp)
{
    // You must specify a callback when using launchAsync
    jassert (callback);

    // you cannot run two file chooser dialog boxes at the same time
    jassert (asyncCallback == nullptr);

    asyncCallback = std::move (callback);

    pimpl = createPimpl (flags, previewComp);
    pimpl->launch();
}

std::shared_ptr<FileChooser::Pimpl> FileChooser::createPimpl (int flags, FilePreviewComponent* previewComp)
{
    results.clear();

    // the preview component needs to be the right size before you pass it in here..
    jassert (previewComp == nullptr || (previewComp->getWidth() > 10
                                         && previewComp->getHeight() > 10));

    if (pimpl != nullptr)
    {
        // you cannot run two file chooser dialog boxes at the same time
        jassertfalse;
        pimpl.reset();
    }

    // You've set the flags for both saveMode and openMode!
    jassert (! (((flags & FileBrowserComponent::saveMode) != 0)
                && ((flags & FileBrowserComponent::openMode) != 0)));

   #if JUCE_WINDOWS
    const bool selectsFiles       = (flags & FileBrowserComponent::canSelectFiles) != 0;
    const bool selectsDirectories = (flags & FileBrowserComponent::canSelectDirectories) != 0;

    if (useNativeDialogBox && ! (selectsFiles && selectsDirectories))
   #else
    if (useNativeDialogBox)
   #endif
    {
        return showPlatformDialog (*this, flags, previewComp);
    }

    return std::make_unique<NonNative> (*this, flags, previewComp);
}

Array<File> FileChooser::getResults() const noexcept
{
    Array<File> files;

    for (auto url : getURLResults())
        if (url.isLocalFile())
            files.add (url.getLocalFile());

    return files;
}

File FileChooser::getResult() const
{
    auto fileResults = getResults();

    // if you've used a multiple-file select, you should use the getResults() method
    // to retrieve all the files that were chosen.
    jassert (fileResults.size() <= 1);

    return fileResults.getFirst();
}

URL FileChooser::getURLResult() const
{
    // if you've used a multiple-file select, you should use the getResults() method
    // to retrieve all the files that were chosen.
    jassert (results.size() <= 1);

    return results.getFirst();
}

void FileChooser::finished (const Array<URL>& asyncResults)
{
    const auto callback = std::exchange (asyncCallback, nullptr);

    results = asyncResults;

    pimpl.reset();

    if (callback)
        callback (*this);
}

#if ! JUCE_ANDROID
void FileChooser::registerCustomMimeTypeForFileExtension ([[maybe_unused]] const String& mimeType,
                                                          [[maybe_unused]] const String& fileExtension)
{
}
#endif

//==============================================================================
FilePreviewComponent::FilePreviewComponent() {}
FilePreviewComponent::~FilePreviewComponent() {}

} // namespace juce