import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_markdown/flutter_markdown.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';

import '../../../../core/theme/app_palette.dart';
import '../../../../data/models/emai_message.dart';

/// EMAI 助手的消息气泡。
///
/// 用户侧是纯文本（ASR 结果不会有 markdown），助手侧走 [MarkdownBody]——
/// 百炼应用的回复里经常有列表和加粗。长按复制。
class EmaiBubble extends StatelessWidget {
  const EmaiBubble({super.key, required this.message, required this.isDark});

  final EmaiMessage message;
  final bool isDark;

  @override
  Widget build(BuildContext context) {
    final isUser = message.isUser;

    final Color bg = message.isError
        ? AppPalette.error.withValues(alpha: isDark ? 0.18 : 0.10)
        : isUser
            ? AppPalette.accent
            : AppPalette.surface(isDark);

    final Color fg = message.isError
        ? AppPalette.error
        : isUser
            ? Colors.white
            : AppPalette.textPrimary(isDark);

    return Align(
      alignment: isUser ? Alignment.centerRight : Alignment.centerLeft,
      child: GestureDetector(
        onLongPress: () {
          if (message.text.trim().isEmpty) return;
          Clipboard.setData(ClipboardData(text: message.text));
          Get.snackbar('tip'.tr, 'copySuccess'.tr,
              snackPosition: SnackPosition.TOP,
              duration: const Duration(seconds: 1));
        },
        child: Container(
          constraints: BoxConstraints(maxWidth: 0.76.sw),
          margin: EdgeInsets.symmetric(vertical: 5.h),
          padding: EdgeInsets.symmetric(horizontal: 14.w, vertical: 10.h),
          decoration: BoxDecoration(
            color: bg,
            borderRadius: BorderRadius.only(
              topLeft: Radius.circular(16.r),
              topRight: Radius.circular(16.r),
              bottomLeft: Radius.circular(isUser ? 16.r : 4.r),
              bottomRight: Radius.circular(isUser ? 4.r : 16.r),
            ),
            border: isUser || message.isError
                ? null
                : Border.all(color: AppPalette.border(isDark)),
          ),
          child: Column(
            crossAxisAlignment:
                isUser ? CrossAxisAlignment.end : CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              _content(fg),
              // 耳机按键唤醒时聊的那些轮次，标一下来源，
              // 免得用户在页面上看到没印象的内容不知道哪来的
              if (message.fromEarphone) ...[
                SizedBox(height: 4.h),
                Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Icon(Icons.headset_mic,
                        size: 11.sp, color: fg.withValues(alpha: 0.55)),
                    SizedBox(width: 3.w),
                    Text(
                      'emaiViaEarphone'.tr,
                      style: TextStyle(
                          fontSize: 10.sp, color: fg.withValues(alpha: 0.55)),
                    ),
                  ],
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }

  Widget _content(Color fg) {
    // 还没收到第一个字的助手气泡：显示三个点，别让它空着闪一下
    if (!message.isUser && message.text.isEmpty && !message.isFinal) {
      return _TypingDots(color: fg);
    }
    if (message.isUser || message.isError) {
      return Text(
        message.text,
        style: TextStyle(fontSize: 15.sp, height: 1.4, color: fg),
      );
    }
    return MarkdownBody(
      data: message.text,
      selectable: false,
      styleSheet: MarkdownStyleSheet(
        p: TextStyle(fontSize: 15.sp, height: 1.45, color: fg),
        listBullet: TextStyle(fontSize: 15.sp, color: fg),
        strong: TextStyle(fontWeight: FontWeight.w600, color: fg),
        code: TextStyle(
          fontSize: 13.sp,
          color: fg,
          backgroundColor: Colors.transparent,
        ),
      ),
    );
  }
}

/// 等待首字时的省略号动画
class _TypingDots extends StatefulWidget {
  const _TypingDots({required this.color});
  final Color color;

  @override
  State<_TypingDots> createState() => _TypingDotsState();
}

class _TypingDotsState extends State<_TypingDots>
    with SingleTickerProviderStateMixin {
  late final AnimationController _c = AnimationController(
    vsync: this,
    duration: const Duration(milliseconds: 1100),
  )..repeat();

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

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _c,
      builder: (_, __) {
        return Row(
          mainAxisSize: MainAxisSize.min,
          children: List.generate(3, (i) {
            // 三个点依次亮起：把 0~1 的进度切成三段
            final phase = (_c.value * 3 - i).clamp(0.0, 1.0);
            final opacity = 0.3 + 0.7 * (phase < 0.5 ? phase * 2 : 1);
            return Container(
              width: 6.w,
              height: 6.w,
              margin: EdgeInsets.symmetric(horizontal: 2.w, vertical: 4.h),
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: widget.color.withValues(alpha: opacity.clamp(0.0, 1.0)),
              ),
            );
          }),
        );
      },
    );
  }
}