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

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

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

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

namespace juce
{

#if ! (defined (__IPHONE_16_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_16_0)
 JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
 #define JUCE_DEPRECATION_IGNORED 1
#endif

class FileChooser::Native  : public FileChooser::Pimpl,
                             public Component,
                             private AsyncUpdater
{
public:
    Native (FileChooser& fileChooser, int flags)
        : owner (fileChooser)
    {
        static FileChooserDelegateClass delegateClass;
        delegate.reset ([delegateClass.createInstance() init]);
        FileChooserDelegateClass::setOwner (delegate.get(), this);

        static FileChooserControllerClass controllerClass;
        auto* controllerClassInstance = controllerClass.createInstance();

        String firstFileExtension;
        auto utTypeArray = createNSArrayFromStringArray (getUTTypesForWildcards (owner.filters, firstFileExtension));

        if ((flags & FileBrowserComponent::saveMode) != 0)
        {
            auto currentFileOrDirectory = owner.startingFile;

            UIDocumentPickerMode pickerMode = currentFileOrDirectory.existsAsFile()
                                                ? UIDocumentPickerModeExportToService
                                                : UIDocumentPickerModeMoveToService;

            if (! currentFileOrDirectory.existsAsFile())
            {
                auto filename = getFilename (currentFileOrDirectory, firstFileExtension);
                auto tmpDirectory = File::createTempFile ("JUCE-filepath");

                if (tmpDirectory.createDirectory().wasOk())
                {
                    currentFileOrDirectory = tmpDirectory.getChildFile (filename);
                    currentFileOrDirectory.replaceWithText ("");
                }
                else
                {
                    // Temporary directory creation failed! You need to specify a
                    // path you have write access to. Saving will not work for
                    // current path.
                    jassertfalse;
                }
            }

            auto url = [[NSURL alloc] initFileURLWithPath: juceStringToNS (currentFileOrDirectory.getFullPathName())];

            controller.reset ([controllerClassInstance initWithURL: url
                                                            inMode: pickerMode]);

            [url release];
        }
        else
        {
            controller.reset ([controllerClassInstance initWithDocumentTypes: utTypeArray
                                                                      inMode: UIDocumentPickerModeOpen]);
            if (@available (iOS 11.0, *))
                [controller.get() setAllowsMultipleSelection: (flags & FileBrowserComponent::canSelectMultipleItems) != 0];
        }

        FileChooserControllerClass::setOwner (controller.get(), this);

        [controller.get() setDelegate: delegate.get()];
        [controller.get() setModalTransitionStyle: UIModalTransitionStyleCrossDissolve];

        setOpaque (false);

        if (fileChooser.parent != nullptr)
        {
            [controller.get() setModalPresentationStyle: UIModalPresentationFullScreen];

            auto chooserBounds = fileChooser.parent->getBounds();
            setBounds (chooserBounds);

            setAlwaysOnTop (true);
            fileChooser.parent->addAndMakeVisible (this);
        }
        else
        {
            if (SystemStats::isRunningInAppExtensionSandbox())
            {
                // Opening a native top-level window in an AUv3 is not allowed (sandboxing). You need to specify a
                // parent component (for example your editor) to parent the native file chooser window. To do this
                // specify a parent component in the FileChooser's constructor!
                jassertfalse;
                return;
            }

            auto chooserBounds = Desktop::getInstance().getDisplays().getPrimaryDisplay()->userArea;
            setBounds (chooserBounds);

            setAlwaysOnTop (true);
            setVisible (true);
            addToDesktop (0);
        }
    }

    ~Native() override
    {
        exitModalState (0);

        // Our old peer may not have received a becomeFirstResponder call at this point,
        // so the static currentlyFocusedPeer may be null.
        // We'll try to find an appropriate peer to focus.

        for (auto i = 0; i < ComponentPeer::getNumPeers(); ++i)
            if (auto* p = ComponentPeer::getPeer (i))
                if (p != getPeer())
                    if (auto* view = (UIView*) p->getNativeHandle())
                        [view becomeFirstResponder];
    }

    void launch() override
    {
        enterModalState (true, nullptr, true);
    }

    void runModally() override
    {
       #if JUCE_MODAL_LOOPS_PERMITTED
        runModalLoop();
       #else
        jassertfalse;
       #endif
    }

    void parentHierarchyChanged() override
    {
        auto* newPeer = dynamic_cast<UIViewComponentPeer*> (getPeer());

        if (peer != newPeer)
        {
            peer = newPeer;

            if (peer != nullptr)
            {
                if (auto* parentController = peer->controller)
                    [parentController showViewController: controller.get() sender: parentController];

                peer->toFront (false);
            }
        }
    }

private:
    //==============================================================================
    void handleAsyncUpdate() override
    {
        pickerWasCancelled();
    }

    //==============================================================================
    static StringArray getUTTypesForWildcards (const String& filterWildcards, String& firstExtension)
    {
        auto filters = StringArray::fromTokens (filterWildcards, ";", "");
        StringArray result;

        firstExtension = {};

        if (! filters.contains ("*") && filters.size() > 0)
        {
            for (auto filter : filters)
            {
                if (filter.isEmpty())
                    continue;

                // iOS only supports file extension wild cards
                jassert (filter.upToLastOccurrenceOf (".", true, false) == "*.");

                auto fileExtension = filter.fromLastOccurrenceOf (".", false, false);
                CFUniquePtr<CFStringRef> fileExtensionCF (fileExtension.toCFString());

                if (firstExtension.isEmpty())
                    firstExtension = fileExtension;

                if (auto tag = CFUniquePtr<CFStringRef> (UTTypeCreatePreferredIdentifierForTag (kUTTagClassFilenameExtension, fileExtensionCF.get(), nullptr)))
                    result.add (String::fromCFString (tag.get()));
            }
        }
        else
        {
            result.add ("public.data");
        }

        return result;
    }

    static String getFilename (const File& path, const String& fallbackExtension)
    {
        auto filename  = path.getFileNameWithoutExtension();
        auto extension = path.getFileExtension().substring (1);

        if (filename.isEmpty())
            filename = "Untitled";

        if (extension.isEmpty())
            extension = fallbackExtension;

        if (extension.isNotEmpty())
            filename += "." + extension;

        return filename;
    }

    //==============================================================================
    void didPickDocumentsAtURLs (NSArray<NSURL*>* urls)
    {
        cancelPendingUpdate();

        const auto isWriting =  controller.get().documentPickerMode == UIDocumentPickerModeExportToService
                             || controller.get().documentPickerMode == UIDocumentPickerModeMoveToService;
        const auto accessOptions = isWriting ? 0 : NSFileCoordinatorReadingWithoutChanges;

        auto* fileCoordinator = [[[NSFileCoordinator alloc] initWithFilePresenter: nil] autorelease];
        auto* intents = [[[NSMutableArray alloc] init] autorelease];

        for (NSURL* url in urls)
        {
            auto* fileAccessIntent = isWriting
                                   ? [NSFileAccessIntent writingIntentWithURL: url options: accessOptions]
                                   : [NSFileAccessIntent readingIntentWithURL: url options: accessOptions];
            [intents addObject: fileAccessIntent];
        }

        [fileCoordinator coordinateAccessWithIntents: intents queue: [NSOperationQueue mainQueue] byAccessor: ^(NSError* err)
        {
            if (err != nil)
            {
                auto desc = [err localizedDescription];
                ignoreUnused (desc);
                jassertfalse;
                return;
            }

            Array<URL> result;

            for (NSURL* url in urls)
            {
                [url startAccessingSecurityScopedResource];

                NSError* error = nil;

                auto* bookmark = [url bookmarkDataWithOptions: 0
                               includingResourceValuesForKeys: nil
                                                relativeToURL: nil
                                                        error: &error];

                [bookmark retain];

                [url stopAccessingSecurityScopedResource];

                URL juceUrl (nsStringToJuce ([url absoluteString]));

                if (error == nil)
                {
                    setURLBookmark (juceUrl, (void*) bookmark);
                }
                else
                {
                    auto desc = [error localizedDescription];
                    ignoreUnused (desc);
                    jassertfalse;
                }

                result.add (std::move (juceUrl));
            }

            owner.finished (std::move (result));
        }];
    }

    void didPickDocumentAtURL (NSURL* url)
    {
        didPickDocumentsAtURLs (@[url]);
    }

    void pickerWasCancelled()
    {
        cancelPendingUpdate();
        owner.finished ({});
        // Calling owner.finished will delete this Pimpl instance, so don't call any more member functions here!
    }

    //==============================================================================
    struct FileChooserDelegateClass  : public ObjCClass<NSObject<UIDocumentPickerDelegate>>
    {
        FileChooserDelegateClass()  : ObjCClass<NSObject<UIDocumentPickerDelegate>> ("FileChooserDelegate_")
        {
            addIvar<Native*> ("owner");

            addMethod (@selector (documentPicker:didPickDocumentAtURL:),   didPickDocumentAtURL);
            addMethod (@selector (documentPicker:didPickDocumentsAtURLs:), didPickDocumentsAtURLs);
            addMethod (@selector (documentPickerWasCancelled:),            documentPickerWasCancelled);

            addProtocol (@protocol (UIDocumentPickerDelegate));

            registerClass();
        }

        static void setOwner (id self, Native* owner)   { object_setInstanceVariable (self, "owner", owner); }
        static Native* getOwner (id self)               { return getIvar<Native*> (self, "owner"); }

        //==============================================================================
        static void didPickDocumentAtURL (id self, SEL, UIDocumentPickerViewController*, NSURL* url)
        {
            if (auto* picker = getOwner (self))
                picker->didPickDocumentAtURL (url);
        }

        static void didPickDocumentsAtURLs (id self, SEL, UIDocumentPickerViewController*, NSArray<NSURL*>* urls)
        {
            if (auto* picker = getOwner (self))
                picker->didPickDocumentsAtURLs (urls);
        }

        static void documentPickerWasCancelled (id self, SEL, UIDocumentPickerViewController*)
        {
            if (auto* picker = getOwner (self))
                picker->pickerWasCancelled();
        }
    };

    struct FileChooserControllerClass  : public ObjCClass<UIDocumentPickerViewController>
    {
        FileChooserControllerClass()  : ObjCClass<UIDocumentPickerViewController> ("FileChooserController_")
        {
            addIvar<Native*> ("owner");
            addMethod (@selector (viewDidDisappear:), viewDidDisappear);

            registerClass();
        }

        static void setOwner (id self, Native* owner)   { object_setInstanceVariable (self, "owner", owner); }
        static Native* getOwner (id self)               { return getIvar<Native*> (self, "owner"); }

        //==============================================================================
        static void viewDidDisappear (id self, SEL, BOOL animated)
        {
            sendSuperclassMessage<void> (self, @selector (viewDidDisappear:), animated);

            if (auto* picker = getOwner (self))
                picker->triggerAsyncUpdate();
        }
    };

    //==============================================================================
    FileChooser& owner;
    NSUniquePtr<NSObject<UIDocumentPickerDelegate>> delegate;
    NSUniquePtr<UIDocumentPickerViewController> controller;
    UIViewComponentPeer* peer = nullptr;

    static FileChooserDelegateClass fileChooserDelegateClass;
    static FileChooserControllerClass fileChooserControllerClass;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Native)
};

//==============================================================================
bool FileChooser::isPlatformDialogAvailable()
{
   #if JUCE_DISABLE_NATIVE_FILECHOOSERS
    return false;
   #else
    return true;
   #endif
}

std::shared_ptr<FileChooser::Pimpl> FileChooser::showPlatformDialog (FileChooser& owner, int flags,
                                                                     FilePreviewComponent*)
{
    return std::make_shared<FileChooser::Native> (owner, flags);
}

#if JUCE_DEPRECATION_IGNORED
 JUCE_END_IGNORE_WARNINGS_GCC_LIKE
#endif

} // namespace juce