part of '../chat_view.dart';

class _DragOverlay extends StatefulWidget {
  final PyramidTheme pt;
  final bool active;
  const _DragOverlay({required this.pt, required this.active});

  @override
  State<_DragOverlay> createState() => _DragOverlayState();
}

class _DragOverlayState extends State<_DragOverlay>
    with SingleTickerProviderStateMixin {
  // Sanftes Auf-und-ab des Icons, solange das Overlay aktiv ist.
  late final AnimationController _bob = AnimationController(
    vsync: this,
    duration: const Duration(milliseconds: 900),
  );

  @override
  void initState() {
    super.initState();
    if (widget.active) _bob.repeat(reverse: true);
  }

  @override
  void didUpdateWidget(_DragOverlay old) {
    super.didUpdateWidget(old);
    if (widget.active && !old.active) {
      _bob.repeat(reverse: true);
    } else if (!widget.active && old.active) {
      _bob.stop();
    }
  }

  @override
  void dispose() {
    _bob.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final pt = widget.pt;
    return Container(
      color: pt.bg0.withAlpha(200),
      child: Center(
        child: AnimatedScale(
          scale: widget.active ? 1.0 : 0.88,
          duration: const Duration(milliseconds: 220),
          curve: Curves.easeOutBack,
          child: Container(
            padding: const EdgeInsets.symmetric(horizontal: 40, vertical: 32),
            decoration: BoxDecoration(
              color: pt.bg2,
              borderRadius: BorderRadius.circular(20),
              border: Border.all(color: pt.accent, width: 2),
              boxShadow: [
                BoxShadow(
                  color: pt.accent.withAlpha(60),
                  blurRadius: 32,
                  spreadRadius: 4,
                ),
              ],
            ),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                AnimatedBuilder(
                  animation: _bob,
                  builder: (_, child) => Transform.translate(
                    offset: Offset(
                        0, -7 * Curves.easeInOut.transform(_bob.value)),
                    child: child,
                  ),
                  child:
                      Icon(Icons.upload_file_rounded, size: 56, color: pt.accent),
                ),
                const SizedBox(height: 16),
                Text(
                  'Datei hier ablegen',
                  style: TextStyle(
                    color: pt.fg,
                    fontSize: 20,
                    fontWeight: FontWeight.w600,
                  ),
                ),
                const SizedBox(height: 8),
                Text(
                  'Loslassen zum Hochladen',
                  style: TextStyle(color: pt.fgMuted, fontSize: 14),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

// Placeholder shown when no room is selected
class NoChatSelected extends StatelessWidget {
  const NoChatSelected({super.key});

  @override
  Widget build(BuildContext context) {
    final pt = PyramidTheme.of(context);
    return Container(
      color: pt.bg1,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.forum_outlined, size: 64, color: pt.fgDim),
            const SizedBox(height: 16),
            Text(
              'Select a room to start chatting',
              style: TextStyle(color: pt.fgMuted, fontSize: 16),
            ),
            const SizedBox(height: 8),
            Text(
              'Choose from the sidebar on the left',
              style: TextStyle(color: pt.fgDim, fontSize: 13),
            ),
          ],
        ),
      ),
    );
  }
}