fluffychat/lib/pangea/toolbar/widgets/practice_mode_transition_animation.dart

import 'package:flutter/material.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/config/themes.dart';
import 'package:fluffychat/pangea/toolbar/widgets/message_selection_positioner.dart';
import 'package:fluffychat/pangea/toolbar/widgets/overlay_center_content.dart';
import 'package:fluffychat/widgets/matrix.dart';

class PracticeModeTransitionAnimation extends StatefulWidget {
  final String targetId;
  final MessageSelectionPositionerState controller;
  const PracticeModeTransitionAnimation({
    super.key,
    required this.targetId,
    required this.controller,
  });

  @override
  State<PracticeModeTransitionAnimation> createState() =>
      PracticeModeTransitionAnimationState();
}

class PracticeModeTransitionAnimationState
    extends State<PracticeModeTransitionAnimation>
    with SingleTickerProviderStateMixin {
  AnimationController? _animationController;
  Animation<Offset>? _offsetAnimation;
  Animation<Size>? _sizeAnimation;

  bool _finishedAnimation = false;

  RenderBox? get _centerMessageRenderBox {
    try {
      return MatrixState.pAnyState.getRenderBox(widget.targetId);
    } catch (e) {
      return null;
    }
  }

  Offset? get _centerMessageOffset {
    final renderBox = _centerMessageRenderBox;
    if (renderBox == null) {
      return null;
    }
    return renderBox.localToGlobal(Offset.zero);
  }

  Size? get _centerMessageSize {
    final renderBox = _centerMessageRenderBox;
    if (renderBox == null) {
      return null;
    }
    return renderBox.size;
  }

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final startOffset = Offset(
        widget.controller.ownMessage
            ? widget.controller.messageRightOffset!
            : widget.controller.messageLeftOffset!,
        widget.controller.overlayMessageOffset!.dy,
      );

      final endOffset = Offset(
        _centerMessageOffset!.dx - widget.controller.columnWidth,
        _centerMessageOffset!.dy,
      );

      _animationController = AnimationController(
        vsync: this,
        duration: widget.controller.transitionAnimationDuration,
        // duration: const Duration(seconds: 3),
      );

      _offsetAnimation = Tween<Offset>(
        begin: startOffset,
        end: endOffset,
      ).animate(
        CurvedAnimation(
          parent: _animationController!,
          curve: FluffyThemes.animationCurve,
        ),
      );

      final startSize = Size(
        widget.controller.originalMessageSize.width,
        widget.controller.originalMessageSize.height,
      );

      _sizeAnimation = Tween<Size>(
        begin: startSize,
        end: _centerMessageSize!,
      ).animate(
        CurvedAnimation(
          parent: _animationController!,
          curve: FluffyThemes.animationCurve,
        ),
      );

      widget.controller.onStartedTransition();
      _animationController!.forward().then((_) {
        widget.controller.onFinishedTransition();
        if (mounted) {
          setState(() {
            _finishedAnimation = true;
          });
        }
      });
    });
  }

  @override
  void dispose() {
    _animationController?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (_offsetAnimation == null || _finishedAnimation) {
      return const SizedBox();
    }

    return AnimatedBuilder(
      animation: _offsetAnimation!,
      builder: (context, child) {
        return Positioned(
          top: _offsetAnimation!.value.dy,
          left:
              widget.controller.ownMessage ? null : _offsetAnimation!.value.dx,
          right:
              widget.controller.ownMessage ? _offsetAnimation!.value.dx : null,
          child: OverlayCenterContent(
            event: widget.controller.widget.event,
            overlayController: widget.controller.widget.overlayController,
            chatController: widget.controller.widget.chatController,
            nextEvent: widget.controller.widget.nextEvent,
            prevEvent: widget.controller.widget.prevEvent,
            hasReactions: widget.controller.hasReactions,
            sizeAnimation: _sizeAnimation,
            readingAssistanceMode: widget.controller.readingAssistanceMode,
          ),
        );
      },
    );
  }
}

class CenteredMessage extends StatelessWidget {
  final String targetId;
  final MessageSelectionPositionerState controller;

  const CenteredMessage({
    super.key,
    required this.targetId,
    required this.controller,
  });

  @override
  Widget build(BuildContext context) {
    return Opacity(
      opacity: controller.finishedTransition ? 1.0 : 0.0,
      child: GestureDetector(
        onTap: controller.widget.chatController.clearSelectedEvents,
        child: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              SizedBox(
                width:
                    controller.mediaQuery!.size.width - controller.columnWidth,
                height: 20.0,
              ),
              OverlayCenterContent(
                event: controller.widget.event,
                overlayController: controller.widget.overlayController,
                chatController: controller.widget.chatController,
                nextEvent: controller.widget.nextEvent,
                prevEvent: controller.widget.prevEvent,
                hasReactions: controller.hasReactions,
                overlayKey: MatrixState.pAnyState
                    .layerLinkAndKey(
                      "overlay_center_message_${controller.widget.event.eventId}",
                    )
                    .key,
                readingAssistanceMode: controller.readingAssistanceMode,
              ),
              const SizedBox(
                height: AppConfig.readingAssistanceInputBarHeight + 60.0,
              ),
            ],
          ),
        ),
      ),
    );
  }
}