import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../controllers/payment_controller.dart';

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

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    
    return Scaffold(
      backgroundColor: isDarkMode ? Colors.black : Colors.grey[50],
      appBar: AppBar(
        backgroundColor: isDarkMode ? Colors.black : Colors.white,
        elevation: 0.5,
        title: Text(
          '微信支付测试',
          style: TextStyle(
            fontSize: 18.sp,
            fontWeight: FontWeight.w600,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        centerTitle: true,
        leading: IconButton(
          icon: Icon(
            Icons.arrow_back_ios,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
          onPressed: () => Get.back(),
        ),
      ),
      body: SingleChildScrollView(
        padding: EdgeInsets.all(16.w),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _buildTestInfoCard(isDarkMode),
            SizedBox(height: 20.h),
            _buildAmountSelector(isDarkMode),
            SizedBox(height: 20.h),
            _buildPaymentButton(isDarkMode),
            SizedBox(height: 20.h),
            _buildStatusCard(isDarkMode),
            SizedBox(height: 20.h),
            _buildInstructions(isDarkMode),
          ],
        ),
      ),
    );
  }
  
  /// 测试信息卡片
  Widget _buildTestInfoCard(bool isDarkMode) {
    return Container(
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '测试订单信息',
            style: TextStyle(
              fontSize: 16.sp,
              fontWeight: FontWeight.w600,
              color: isDarkMode ? Colors.white : Colors.black,
            ),
          ),
          SizedBox(height: 12.h),
          Obx(() => _buildInfoRow('订单ID', controller.testOrderId.value, isDarkMode)),
          SizedBox(height: 8.h),
          _buildInfoRow('商品描述', '微信支付测试', isDarkMode),
          SizedBox(height: 8.h),
          Obx(() => _buildInfoRow('支付金额', '¥${controller.testAmount.value.toStringAsFixed(2)}', isDarkMode)),
        ],
      ),
    );
  }
  
  /// 信息行
  Widget _buildInfoRow(String label, String value, bool isDarkMode) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        SizedBox(
          width: 80.w,
          child: Text(
            '$label:',
            style: TextStyle(
              fontSize: 14.sp,
              color: isDarkMode ? Colors.grey[400] : Colors.grey[600],
            ),
          ),
        ),
        Expanded(
          child: Text(
            value,
            style: TextStyle(
              fontSize: 14.sp,
              color: isDarkMode ? Colors.white : Colors.black,
            ),
          ),
        ),
      ],
    );
  }
  
  /// 金额选择器
  Widget _buildAmountSelector(bool isDarkMode) {
    final amounts = [0.01, 0.10, 1.00, 10.00];
    
    return Container(
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '选择测试金额',
            style: TextStyle(
              fontSize: 16.sp,
              fontWeight: FontWeight.w600,
              color: isDarkMode ? Colors.white : Colors.black,
            ),
          ),
          SizedBox(height: 12.h),
          Wrap(
            spacing: 12.w,
            runSpacing: 8.h,
            children: amounts.map((amount) {
              return Obx(() => GestureDetector(
                onTap: () => controller.updateTestAmount(amount),
                child: Container(
                  padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
                  decoration: BoxDecoration(
                    color: controller.testAmount.value == amount
                        ? Colors.blue[600]
                        : (isDarkMode ? Colors.grey[800] : Colors.grey[200]),
                    borderRadius: BorderRadius.circular(20.r),
                  ),
                  child: Text(
                    '¥${amount.toStringAsFixed(2)}',
                    style: TextStyle(
                      fontSize: 14.sp,
                      color: controller.testAmount.value == amount
                          ? Colors.white
                          : (isDarkMode ? Colors.white : Colors.black),
                    ),
                  ),
                ),
              ));
            }).toList(),
          ),
        ],
      ),
    );
  }
  
  /// 支付按钮
  Widget _buildPaymentButton(bool isDarkMode) {
    return Obx(() => SizedBox(
      width: double.infinity,
      height: 50.h,
      child: ElevatedButton(
        onPressed: controller.isLoading.value ? null : controller.testWechatPayment,
        style: ElevatedButton.styleFrom(
          backgroundColor: Colors.green[600],
          foregroundColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12.r),
          ),
          elevation: 2,
        ),
        child: controller.isLoading.value
            ? Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  SizedBox(
                    width: 20.w,
                    height: 20.w,
                    child: const CircularProgressIndicator(
                      strokeWidth: 2,
                      valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                    ),
                  ),
                  SizedBox(width: 12.w),
                  const Text('处理中...'),
                ],
              )
            : Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Icon(Icons.payment, size: 20.w),
                  SizedBox(width: 8.w),
                  Text(
                    '发起微信支付',
                    style: TextStyle(
                      fontSize: 16.sp,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ],
              ),
      ),
    ));
  }
  
  /// 状态卡片
  Widget _buildStatusCard(bool isDarkMode) {
    return Obx(() {
      if (controller.paymentStatus.value.isEmpty) {
        return const SizedBox.shrink();
      }
      
      final isError = controller.errorMessage.value.isNotEmpty;
      
      return Container(
        padding: EdgeInsets.all(16.w),
        decoration: BoxDecoration(
          color: isError 
              ? (isDarkMode ? Colors.red[900] : Colors.red[50])
              : (isDarkMode ? Colors.green[900] : Colors.green[50]),
          borderRadius: BorderRadius.circular(12.r),
          border: Border.all(
            color: isError ? Colors.red[300]! : Colors.green[300]!,
            width: 1,
          ),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Icon(
                  isError ? Icons.error : Icons.check_circle,
                  color: isError ? Colors.red[600] : Colors.green[600],
                  size: 20.w,
                ),
                SizedBox(width: 8.w),
                Text(
                  '支付状态',
                  style: TextStyle(
                    fontSize: 16.sp,
                    fontWeight: FontWeight.w600,
                    color: isError ? Colors.red[600] : Colors.green[600],
                  ),
                ),
              ],
            ),
            SizedBox(height: 8.h),
            Text(
              controller.paymentStatus.value,
              style: TextStyle(
                fontSize: 14.sp,
                color: isDarkMode ? Colors.white : Colors.black,
              ),
            ),
            if (controller.errorMessage.value.isNotEmpty) ...[
              SizedBox(height: 8.h),
              Text(
                '错误信息: ${controller.errorMessage.value}',
                style: TextStyle(
                  fontSize: 12.sp,
                  color: Colors.red[600],
                ),
              ),
            ],
            SizedBox(height: 12.h),
            SizedBox(
              width: double.infinity,
              child: OutlinedButton(
                onPressed: controller.resetStatus,
                style: OutlinedButton.styleFrom(
                  side: BorderSide(
                    color: isError ? Colors.red[600]! : Colors.green[600]!,
                  ),
                ),
                child: Text(
                  '重新测试',
                  style: TextStyle(
                    color: isError ? Colors.red[600] : Colors.green[600],
                  ),
                ),
              ),
            ),
          ],
        ),
      );
    });
  }
  
  /// 使用说明
  Widget _buildInstructions(bool isDarkMode) {
    return Container(
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.blue[50],
        borderRadius: BorderRadius.circular(12.r),
        border: Border.all(
          color: Colors.blue[200]!,
          width: 1,
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(
                Icons.info_outline,
                color: Colors.blue[600],
                size: 20.w,
              ),
              SizedBox(width: 8.w),
              Text(
                '使用说明',
                style: TextStyle(
                  fontSize: 16.sp,
                  fontWeight: FontWeight.w600,
                  color: Colors.blue[600],
                ),
              ),
            ],
          ),
          SizedBox(height: 12.h),
          Text(
            '1. 选择测试金额（建议使用0.01元进行测试）\n'
            '2. 点击"发起微信支付"按钮\n'
            '3. 系统将调用微信支付SDK\n'
            '4. 在微信中完成支付流程\n'
            '5. 返回应用查看支付结果\n\n'
            '注意：这是测试环境，实际不会产生真实扣费',
            style: TextStyle(
              fontSize: 14.sp,
              color: isDarkMode ? Colors.grey[300] : Colors.grey[700],
              height: 1.5,
            ),
          ),
        ],
      ),
    );
  }
}