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';
import '../widgets/voice_input_panel.dart';

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

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        final tts = Get.find<VolcanoTtsService>();
        await tts.stop();
        return true;
      },
      child: Scaffold(
        backgroundColor: Colors.white,
        appBar: _buildAppBar(),
        body: SafeArea(
          child: Column(
            children: [
              Expanded(
                child: _buildMessageList(),
              ),
              _buildInputSection(),
            ],
          ),
        ),
      ),
    );
  }

  PreferredSizeWidget _buildAppBar() {
    return 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.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: () => _showMoreOptions(),
        ),
      ],
    );
  }

  Widget _buildMessageList() {
    return Stack(
      children: [
        Obx(() => ListView.builder(
          controller: controller.scrollController,
          padding: EdgeInsets.only(
            top: 16.h,
            bottom: controller.isVoiceInputVisible.value ? 140.h : 80.h,
          ),
          itemCount: controller.messages.length,
          itemBuilder: (context, index) => _buildMessage(controller.messages[index]),
          physics: const AlwaysScrollableScrollPhysics(),
          clipBehavior: Clip.none,
          keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
        )),
        Obx(() {
          if (!controller.isLoading.value) return const SizedBox.shrink();
          return Positioned(
            bottom: controller.isVoiceInputVisible.value ? 150.h : 90.h,
            left: 0,
            right: 0,
            child: 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],
                    ),
                  ),
                ],
              ),
            ),
          );
        }),
      ],
    );
  }

  Widget _buildInputSection() {
    return Obx(() {
      if (controller.isVoiceInputVisible.value) {
        return VoiceInputPanel(
          onRecordingResult: controller.handleVoiceResult,
          onClose: controller.stopVoiceInput,
          onRecognizing: controller.handleRecognizing,
        );
      }
      return _buildTextInput();
    });
  }

  Widget _buildTextInput() {
    return 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: Row(
        children: [
          Expanded(
            child: Container(
              padding: EdgeInsets.symmetric(horizontal: 16.w),
              decoration: BoxDecoration(
                color: Colors.grey[100],
                borderRadius: BorderRadius.circular(24.r),
              ),
              child: Row(
                children: [
                  IconButton(
                    icon: Icon(
                      Icons.mic,
                      color: Colors.grey[600],
                      size: 24.sp,
                    ),
                    onPressed: controller.startVoiceInput,
                  ),
                  Expanded(
                    child: TextField(
                      controller: controller.messageController,
                      decoration: const InputDecoration(
                        hintText: '输入消息...',
                        border: InputBorder.none,
                      ),
                      maxLines: null,
                      keyboardType: TextInputType.multiline,
                      textInputAction: TextInputAction.send,
                      onSubmitted: (_) => controller.sendMessage(),
                    ),
                  ),
                  IconButton(
                    icon: const Icon(Icons.send),
                    color: const Color(0xFF4A6FE5),
                    onPressed: controller.sendMessage,
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _showMoreOptions() {
    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();
              },
            ),
          ],
        ),
      ),
    );
  }

  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,
              ),
            ),
          ],
        ],
      ),
    );
  }
}