import 'package:flutter/material.dart';

enum BubbleNip { leftTop, rightBottom, none }

class BubbleEdges {
  const BubbleEdges.only({this.top = 0, this.bottom = 0, this.left = 0, this.right = 0});
  const BubbleEdges.all(double value)
      : top = value,
        bottom = value,
        left = value,
        right = value;

  final double top;
  final double bottom;
  final double left;
  final double right;

  EdgeInsets toEdgeInsets() => EdgeInsets.fromLTRB(left, top, right, bottom);
}

class BubbleStyle {
  const BubbleStyle({
    this.color,
    this.borderWidth = 0,
    this.elevation = 0,
    this.margin = const BubbleEdges.only(),
    this.padding = const BubbleEdges.all(8),
    this.alignment = Alignment.centerLeft,
    this.nip = BubbleNip.none,
    this.borderRadius = 12,
  });

  final Color? color;
  final double borderWidth;
  final double elevation;
  final BubbleEdges margin;
  final BubbleEdges padding;
  final Alignment alignment;
  final BubbleNip nip;
  final double borderRadius;
}

/// Lightweight chat bubble. Replaces the abandoned `bubble` package: renders a
/// rounded container with optional shadow / border. The nip is conveyed by
/// flattening one corner so the bubble visually anchors to the speaker side.
class Bubble extends StatelessWidget {
  const Bubble({required this.child, required this.style, super.key});

  final Widget child;
  final BubbleStyle style;

  BorderRadius _radius() {
    final r = Radius.circular(style.borderRadius);
    final flat = Radius.zero;
    switch (style.nip) {
      case BubbleNip.leftTop:
        return BorderRadius.only(topLeft: flat, topRight: r, bottomLeft: r, bottomRight: r);
      case BubbleNip.rightBottom:
        return BorderRadius.only(topLeft: r, topRight: r, bottomLeft: r, bottomRight: flat);
      case BubbleNip.none:
        return BorderRadius.all(r);
    }
  }

  @override
  Widget build(BuildContext context) {
    final radius = _radius();
    return Align(
      alignment: style.alignment,
      child: Container(
        margin: style.margin.toEdgeInsets(),
        decoration: BoxDecoration(
          color: style.color,
          borderRadius: radius,
          border: style.borderWidth > 0
              ? Border.all(color: Theme.of(context).dividerColor, width: style.borderWidth)
              : null,
          boxShadow: style.elevation > 0
              ? [BoxShadow(color: Colors.black26, blurRadius: style.elevation * 2, offset: Offset(0, style.elevation))]
              : null,
        ),
        padding: style.padding.toEdgeInsets(),
        child: child,
      ),
    );
  }
}