part of '../viewer_app_bar_settings.dart';

class _DemoView extends StatelessWidget {
  const _DemoView();

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: buildDarkTheme(context),
      child: Builder(
        builder: (context) => _BlocSelector(
          selector: (state) => state.buttons,
          builder: (context, buttons) {
            final appBar = AppBar(
              backgroundColor: Colors.black,
              leading: IgnorePointer(
                ignoring: true,
                child: BackButton(onPressed: () {}),
              ),
              title: const _DemoAppBarTitle(),
              actions: [
                ...buttons.map((e) => SizedBox.square(
                      dimension: 48,
                      child: my.Draggable<ViewerAppBarButtonType>(
                        data: e,
                        feedback: _DraggingButton(
                          child: _DemoButtonDelegate(e),
                        ),
                        onDropBefore: (data) {
                          context.addEvent(_MoveButton.before(
                            which: data,
                            target: e,
                          ));
                        },
                        onDropAfter: (data) {
                          context.addEvent(_MoveButton.after(
                            which: data,
                            target: e,
                          ));
                        },
                        child: _DemoButtonDelegate(e),
                      ),
                    )),
                const _DemoMoreButton(),
              ],
            );
            if (buttons.isEmpty) {
              return DragTarget<ViewerAppBarButtonType>(
                builder: (context, candidateData, rejectedData) => SizedBox(
                  height: kToolbarHeight,
                  child: Stack(
                    children: [
                      appBar,
                      IgnorePointer(
                        child: Opacity(
                          opacity: candidateData.isNotEmpty ? .35 : 0,
                          child: Container(
                            color: Theme.of(context).colorScheme.onSurface,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
                onAcceptWithDetails: (details) {
                  context.addEvent(_MoveButton.first(which: details.data));
                },
              );
            } else {
              return appBar;
            }
          },
        ),
      ),
    );
  }
}

class _DemoAppBarTitle extends StatelessWidget {
  const _DemoAppBarTitle();

  @override
  Widget build(BuildContext context) {
    final locale = Localizations.localeOf(context).languageCode;
    final localTime = DateTime.now();
    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: getRawPlatform() == NpPlatform.iOs
          ? CrossAxisAlignment.center
          : CrossAxisAlignment.start,
      children: [
        Text(
          (localTime.year == DateTime.now().year
                  ? DateFormat.MMMd(locale)
                  : DateFormat.yMMMd(locale))
              .format(localTime),
          style: Theme.of(context).textTheme.titleMedium,
        ),
        Text(
          DateFormat.jm(locale).format(localTime),
          style: Theme.of(context).textTheme.bodySmall,
        ),
      ],
    );
  }
}

class _DemoBottomView extends StatelessWidget {
  const _DemoBottomView();

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: buildDarkTheme(context),
      child: Container(
        height: kToolbarHeight,
        alignment: Alignment.center,
        color: Colors.black,
        child: _BlocSelector(
          selector: (state) => state.buttons,
          builder: (context, buttons) => buttons.isEmpty
              ? DragTarget<ViewerAppBarButtonType>(
                  builder: (context, candidateData, rejectedData) => Opacity(
                    opacity: candidateData.isNotEmpty ? .35 : 0,
                    child: Container(
                      color: Theme.of(context).colorScheme.onSurface,
                    ),
                  ),
                  onAcceptWithDetails: (details) {
                    context.addEvent(_MoveButton.first(which: details.data));
                  },
                )
              : Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  mainAxisSize: MainAxisSize.max,
                  children: buttons
                      .map((e) => Expanded(
                            flex: 1,
                            child: my.Draggable<ViewerAppBarButtonType>(
                              data: e,
                              feedback: _DraggingButton(
                                child: _DemoButtonDelegate(e),
                              ),
                              onDropBefore: (data) {
                                context.addEvent(_MoveButton.before(
                                  which: data,
                                  target: e,
                                ));
                              },
                              onDropAfter: (data) {
                                context.addEvent(_MoveButton.after(
                                  which: data,
                                  target: e,
                                ));
                              },
                              child: _DemoButtonDelegate(e),
                            ),
                          ))
                      .toList(),
                ),
        ),
      ),
    );
  }
}

class _DemoButtonDelegate extends StatelessWidget {
  const _DemoButtonDelegate(this.type);

  @override
  Widget build(BuildContext context) {
    switch (type) {
      case ViewerAppBarButtonType.livePhoto:
        return const _DemoLivePhotoButton();
      case ViewerAppBarButtonType.favorite:
        return const _DemoFavoriteButton();
      case ViewerAppBarButtonType.share:
        return const _DemoShareButton();
      case ViewerAppBarButtonType.edit:
        return const _DemoEditButton();
      case ViewerAppBarButtonType.enhance:
        return const _DemoEnhanceButton();
      case ViewerAppBarButtonType.download:
        return const _DemoDownloadButton();
      case ViewerAppBarButtonType.delete:
        return const _DemoDeleteButton();
      case ViewerAppBarButtonType.archive:
        return const _DemoArchiveButton();
      case ViewerAppBarButtonType.slideshow:
        return const _DemoSlideshowButton();
      case ViewerAppBarButtonType.setAs:
        return const _DemoSetAsButton();
    }
  }

  final ViewerAppBarButtonType type;
}

class _CandidateGrid extends StatelessWidget {
  const _CandidateGrid();

  @override
  Widget build(BuildContext context) {
    return DragTarget<ViewerAppBarButtonType>(
      builder: (context, candidateData, rejectedData) => Stack(
        children: [
          _BlocSelector(
            selector: (state) => state.buttons,
            builder: (context, buttons) => GridView.extent(
              padding: const EdgeInsets.symmetric(
                horizontal: 16,
                vertical: 8,
              ),
              physics: const NeverScrollableScrollPhysics(),
              maxCrossAxisExtent: 72,
              childAspectRatio: 0.8,
              crossAxisSpacing: 8,
              mainAxisSpacing: 16,
              shrinkWrap: true,
              children: ViewerAppBarButtonType.values
                  .where((e) => !buttons.contains(e))
                  .map((e) => my.Draggable<ViewerAppBarButtonType>(
                        data: e,
                        feedback: _DraggingButton(
                          child: _DemoButtonDelegate(e),
                        ),
                        child: _CandidateButtonDelegate(e),
                      ))
                  .toList(),
            ),
          ),
          IgnorePointer(
            child: Opacity(
              opacity: candidateData.isNotEmpty ? .1 : 0,
              child: Container(
                color: Theme.of(context).colorScheme.onSurface,
              ),
            ),
          ),
        ],
      ),
      onAcceptWithDetails: (details) {
        context.addEvent(_RemoveButton(details.data));
      },
      onWillAcceptWithDetails: (details) {
        // moving down
        return context.state.buttons.contains(details.data);
      },
    );
  }
}

class _CandidateButtonDelegate extends StatelessWidget {
  const _CandidateButtonDelegate(this.type);

  @override
  Widget build(BuildContext context) {
    switch (type) {
      case ViewerAppBarButtonType.livePhoto:
        return const _GridLivePhotoButton();
      case ViewerAppBarButtonType.favorite:
        return const _GridFavoriteButton();
      case ViewerAppBarButtonType.share:
        return const _GridShareButton();
      case ViewerAppBarButtonType.edit:
        return const _GridEditButton();
      case ViewerAppBarButtonType.enhance:
        return const _GridEnhanceButton();
      case ViewerAppBarButtonType.download:
        return const _GridDownloadButton();
      case ViewerAppBarButtonType.delete:
        return const _GridDeleteButton();
      case ViewerAppBarButtonType.archive:
        return const _GridArchiveButton();
      case ViewerAppBarButtonType.slideshow:
        return const _GridSlideshowButton();
      case ViewerAppBarButtonType.setAs:
        return const _GridSetAsButton();
    }
  }

  final ViewerAppBarButtonType type;
}

class _DraggingButton extends StatelessWidget {
  const _DraggingButton({
    required this.child,
  });

  @override
  Widget build(BuildContext context) {
    return ClipOval(
      child: Container(
        width: 48,
        height: 48,
        color: Theme.of(context).colorScheme.surfaceVariant,
        child: child,
      ),
    );
  }

  final Widget child;
}