import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../controllers/chat_controller.dart';
import '../models/message_model.dart';
import '../../../data/services/volcano_tts_service.dart';

class ChatView extends GetView<ChatController> {
  const ChatView({Key? key}) : super(key: key);

  Widget _buildMessage(Message message) {
    final isUser = message.role == 'user';
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
      child: Row(
        mainAxisAlignment: isUser ? MainAxisAlignment.end : MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (!isUser) ...[
            CircleAvatar(
              radius: 20.r,
              backgroundImage: AssetImage(controller.agentAvatar),
              backgroundColor: Colors.transparent,
            ),
            SizedBox(width: 12.w),
          ],
          Flexible(
            child: Container(
              padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 12.h),
              decoration: BoxDecoration(
                color: isUser ? const Color(0xFF4A6FE5) : const Color(0xFFF5F5F5),
                borderRadius: BorderRadius.only(
                  topLeft: Radius.circular(isUser ? 18.r : 4.r),
                  topRight: Radius.circular(isUser ? 4.r : 18.r),
                  bottomLeft: Radius.circular(18.r),
                  bottomRight: Radius.circular(18.r),
                ),
              ),
              child: Text(
                message.content,
                style: TextStyle(
                  fontSize: 16.sp,
                  color: isUser ? Colors.white : Colors.black87,
                  height: 1.5,
                ),
              ),
            ),
          ),
          if (isUser) ...[
            SizedBox(width: 12.w),
            CircleAvatar(
              radius: 20.r,
              backgroundColor: const Color(0xFFEEF4FF),
              child: Icon(
                Icons.person,
                color: const Color(0xFF4A6FE5),
                size: 24.sp,
              ),
            ),
          ],
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    // 添加布局完成后的回调
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (controller.scrollController.hasClients) {
        controller.scrollController.jumpTo(
          controller.scrollController.position.maxScrollExtent,
        );
      }
    });

    return WillPopScope(
      onWillPop: () async {
        final tts = Get.find<VolcanoTtsService>();
        await tts.stop();
        Get.delete<ChatController>();  // 删除控制器
        return true;
      },
      child: Scaffold(
        backgroundColor: Colors.white,
        appBar: AppBar(
          backgroundColor: Colors.white,
          elevation: 0,
          leading: IconButton(
            icon: Icon(
              Icons.arrow_back_ios,
              color: Colors.black,
              size: 20.sp,
            ),
            onPressed: () async {
              final tts = Get.find<VolcanoTtsService>();
              await tts.stop();
              Get.delete<ChatController>();  // 删除控制器
              Get.back();
            },
          ),
          title: Column(
            children: [
              Text(
                controller.agentName,
                style: TextStyle(
                  fontSize: 17.sp,
                  fontWeight: FontWeight.w600,
                  color: Colors.black,
                ),
              ),
              if (controller.agentSubtitle != null)
                Text(
                  controller.agentSubtitle!,
                  style: TextStyle(
                    fontSize: 12.sp,
                    color: Colors.grey[600],
                  ),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
            ],
          ),
          centerTitle: true,
          actions: [
            IconButton(
              icon: Obx(() => Icon(
                Get.find<VolcanoTtsService>().isEnabled.value
                  ? Icons.volume_up
                  : Icons.volume_off,
                color: Colors.black,
                size: 24.sp,
              )),
              onPressed: controller.toggleTTS,
            ),
            IconButton(
              icon: Icon(
                Icons.more_horiz,
                color: Colors.black,
                size: 24.sp,
              ),
              onPressed: () {
                Get.bottomSheet(
                  Container(
                    padding: EdgeInsets.all(20.w),
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.only(
                        topLeft: Radius.circular(20.r),
                        topRight: Radius.circular(20.r),
                      ),
                    ),
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        ListTile(
                          leading: const Icon(Icons.delete_outline, color: Colors.red),
                          title: const Text('清空对话'),
                          onTap: () {
                            Get.back();
                            controller.clearChat();
                          },
                        ),
                      ],
                    ),
                  ),
                );
              },
            ),
          ],
        ),
        body: Column(
          children: [
            Expanded(
              child: Obx(() => ListView.builder(
                controller: controller.scrollController,
                padding: EdgeInsets.symmetric(vertical: 16.h),
                itemCount: controller.messages.length,
                itemBuilder: (context, index) => _buildMessage(controller.messages[index]),
                physics: const AlwaysScrollableScrollPhysics(),
                clipBehavior: Clip.none,
                keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
              )),
            ),
            Obx(() => controller.isLoading.value
              ? Container(
                  padding: EdgeInsets.symmetric(vertical: 8.h),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      SizedBox(
                        width: 16.w,
                        height: 16.w,
                        child: const CircularProgressIndicator(
                          strokeWidth: 2,
                          valueColor: AlwaysStoppedAnimation<Color>(Color(0xFF4A6FE5)),
                        ),
                      ),
                      SizedBox(width: 8.w),
                      Text(
                        '正在思考...',
                        style: TextStyle(
                          fontSize: 14.sp,
                          color: Colors.grey[600],
                        ),
                      ),
                    ],
                  ),
                )
              : const SizedBox.shrink(),
            ),
            Container(
              padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
              decoration: BoxDecoration(
                color: Colors.white,
                border: Border(
                  top: BorderSide(
                    color: Colors.grey[200]!,
                    width: 1,
                  ),
                ),
              ),
              child: SafeArea(
                child: Row(
                  children: [
                    Expanded(
                      child: Container(
                        padding: EdgeInsets.symmetric(horizontal: 16.w),
                        decoration: BoxDecoration(
                          color: Colors.grey[100],
                          borderRadius: BorderRadius.circular(24.r),
                        ),
                        child: TextField(
                          controller: controller.textController,
                          decoration: InputDecoration(
                            hintText: '发消息...',
                            hintStyle: TextStyle(
                              color: Colors.grey[400],
                              fontSize: 16.sp,
                            ),
                            border: InputBorder.none,
                          ),
                          style: TextStyle(
                            fontSize: 16.sp,
                          ),
                          maxLines: 1,
                          textInputAction: TextInputAction.send,
                          onSubmitted: controller.sendMessage,
                        ),
                      ),
                    ),
                    SizedBox(width: 12.w),
                    GestureDetector(
                      onTap: () {
                        if (controller.textController.text.isNotEmpty) {
                          controller.sendMessage(controller.textController.text);
                        }
                      },
                      child: Container(
                        width: 40.w,
                        height: 40.w,
                        decoration: BoxDecoration(
                          color: const Color(0xFF4A6FE5),
                          borderRadius: BorderRadius.circular(20.r),
                        ),
                        child: Icon(
                          Icons.send,
                          color: Colors.white,
                          size: 20.sp,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}