import 'package:chicken_farm/apis/index.dart';
import 'package:chicken_farm/core/utils/logger.dart';
import 'package:flutter/material.dart';
import 'package:chicken_farm/components/vb_app_bar.dart';
import 'package:chicken_farm/core/utils/toast.dart';
import 'package:chicken_farm/core/services/pda/scan_channel.dart';
import 'package:chicken_farm/components/vb_rfid_field.dart';

class CageChangePage extends StatefulWidget {
  const CageChangePage({super.key});

  @override
  State<CageChangePage> createState() => _CageChangePageState();
}

class _CageChangePageState extends State<CageChangePage> {
  final List<String> _rfids = [];

  // 添加TextEditingControllers用于控制输入框
  final TextEditingController _sourceCageController = TextEditingController();
  final TextEditingController _targetCageController = TextEditingController();

  // 添加FocusNode用于控制焦点
  final FocusNode _sourceCageFocusNode = FocusNode();
  final FocusNode _targetCageFocusNode = FocusNode();

  // 扫描状态
  bool _isScanningSource = false;
  bool _isScanningTarget = false;
  int _scanTag = 1;

  @override
  void initState() {
    super.initState();

    _sourceCageController.clear();
    _targetCageController.clear();
    // 监听焦点变化以更新_scanTag值
    _sourceCageFocusNode.addListener(() {
      if (_sourceCageFocusNode.hasFocus) {
        _scanTag = 1;
      }
    });

    _targetCageFocusNode.addListener(() {
      if (_targetCageFocusNode.hasFocus) {
        _scanTag = 2;
      }
    });

    ScanChannel.openScanHead().then((success) {
      if (success) {
        logger.d("扫描头已打开");
      } else {
        logger.d("扫描头打开失败");
      }
    });
    // 初始化监听
    ScanChannel.initScanListener(
      onScanResult: (result) {
        if (_scanTag == 1) {
          // 源笼号
          setState(() {
            _sourceCageController.text = result;
            _isScanningSource = false;
          });
          if (_targetCageController.text.isEmpty) {
            // 源笼号扫描成功后自动延时扫描目标笼号
            ScanChannel.stopSingleScan();
            logger.d("自动扫描目标笼号");
            _targetCageFocusNode.requestFocus();
            _dealyScanCode(2);
          }
        } else if (_scanTag == 2) {
          // 目标笼号
          setState(() {
            _targetCageController.text = result;
            _isScanningTarget = false;
          });
        }
        // 扫码成功后停止解码（保留扫描头）
        ScanChannel.stopSingleScan();
      },
      onScanError: (error) {
        logger.d("扫码错误：$error");
        setState(() {
          _isScanningSource = false;
        });
      },
      onKeyPress: (bool isDouble, String keyCode) {
        if (isDouble && keyCode == "KEY_619") {
          _sourceCageController.clear();
          _targetCageController.clear();
          _scanTag = 1;
          ScanChannel.startScan();
        } else {
          logger.d("按键：$isDouble $keyCode");
        }
      },
    );
    _scanTag = 1;

    // 进入页面默认使原笼号获取到焦点
    // WidgetsBinding.instance.addPostFrameCallback((_) {
    //   _sourceCageFocusNode.requestFocus();
    // });
  }

  @override
  void dispose() {
    // 释放TextEditingControllers
    _sourceCageController.dispose();
    _targetCageController.dispose();

    // 释放FocusNode
    _sourceCageFocusNode.dispose();
    _targetCageFocusNode.dispose();

    // 手动关闭扫描头，立即释放资源
    ScanChannel.closeScanHead();
    // 释放通道
    ScanChannel.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: const VberAppBar(title: '换笼管理', showLeftButton: true),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // 源笼号区域
              _buildCageSection(1),

              const SizedBox(height: 15),

              // 目标笼号区域
              _buildCageSection(2),
              const SizedBox(height: 15),
              // 电子编号区域
              _buildRfidSection(),
              const SizedBox(height: 15),
              // 提交按钮
              SizedBox(
                width: double.infinity,
                child: ElevatedButton(
                  onPressed:
                      _sourceCageController.text.isNotEmpty &&
                          _targetCageController.text.isNotEmpty &&
                          _rfids.isNotEmpty
                      ? _handleSubmit
                      : null,
                  style: ElevatedButton.styleFrom(
                    backgroundColor:
                        (_sourceCageController.text.isNotEmpty &&
                            _targetCageController.text.isNotEmpty &&
                            _rfids.isNotEmpty)
                        ? Colors.blue
                        : Colors.grey,
                    foregroundColor: Colors.white,
                  ),
                  child: const Text('提交'),
                ),
              ),
              const SizedBox(height: 20),
              // 已识别的电子编号列表
              if (_rfids.isNotEmpty) ...[
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text(
                      '已识别的电子编号',
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    IconButton(
                      icon: const Icon(Icons.clear, size: 18),
                      onPressed: _clearRfids,
                      tooltip: '清空编号',
                    ),
                  ],
                ),
                const SizedBox(height: 10),
                Container(
                  padding: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.grey),
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: ListView.builder(
                    shrinkWrap: true,
                    physics: const NeverScrollableScrollPhysics(),
                    padding: EdgeInsets.zero,
                    itemCount: _rfids.length,
                    itemBuilder: (context, index) {
                      return ListTile(
                        visualDensity: VisualDensity.compact,
                        contentPadding: const EdgeInsets.symmetric(
                          horizontal: 2,
                          vertical: 0,
                        ),
                        title: Text(_rfids[index]),
                        trailing: IconButton(
                          icon: const Icon(
                            Icons.delete,
                            size: 18,
                            color: Colors.red,
                          ),
                          onPressed: () => _removeRfid(index),
                        ),
                      );
                    },
                  ),
                ),
              ],
              const SizedBox(height: 20),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildCageSection(int tag) {
    String title = '源笼号';
    TextEditingController controller = _sourceCageController;
    FocusNode focusNode = _sourceCageFocusNode;
    bool isScanning = _isScanningSource;

    if (tag != 1) {
      tag = 2;
      title = '目标笼号';
      controller = _targetCageController;
      focusNode = _targetCageFocusNode;
      isScanning = _isScanningTarget;
    }

    // 确保光标在文本末尾
    if (controller.text.isNotEmpty) {
      controller.selection = TextSelection.fromPosition(
        TextPosition(offset: controller.text.length),
      );
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(title, style: const TextStyle(fontWeight: FontWeight.bold)),
        const SizedBox(height: 10),
        Container(
          padding: const EdgeInsets.fromLTRB(16, 2, 16, 2),
          decoration: BoxDecoration(
            border: Border.all(color: Colors.grey),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Row(
            children: [
              Expanded(
                // 将Text替换为TextField
                child: TextField(
                  focusNode: focusNode,
                  controller: controller,
                  enabled: controller.text.isEmpty,
                  decoration: InputDecoration(
                    border: InputBorder.none,
                    hintText: controller.text.isNotEmpty ? null : '未扫描',
                    hintStyle: TextStyle(
                      color: controller.text.isNotEmpty
                          ? Colors.black
                          : Colors.grey,
                      fontSize: 16,
                    ),
                  ),
                  style: TextStyle(
                    color: controller.text.isNotEmpty
                        ? Colors.black
                        : Colors.grey,
                    fontSize: 16,
                  ),
                  onChanged: (text) {
                    setState(() {
                      // 文本更改由controller自动处理
                    });
                  },
                ),
              ),
              if (controller.text.isNotEmpty) ...[
                IconButton(
                  icon: const Icon(Icons.refresh, size: 20),
                  onPressed: () {
                    _handleChangeCageCode(tag);
                  },
                ),
              ] else ...[
                IconButton(
                  icon: isScanning
                      ? const SizedBox(
                          width: 20,
                          height: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Icon(Icons.qr_code_scanner, size: 20),
                  onPressed: () {
                    _handleScanCageCode(tag);
                  },
                ),
              ],
            ],
          ),
        ),
      ],
    );
  }

  Widget _buildRfidSection() {
    return VberRfidField(
      rfids: _rfids,
      onRfidScanned: (rfid) {
        // 检查是否已存在相同的RFID标签
        bool isDuplicate = _rfids.any((existingRfid) => existingRfid == rfid);
        if (isDuplicate) {
          ToastUtil.info("电子编号已存在");
        } else {
          // 如果不重复，添加到列表中
          setState(() {
            _rfids.insert(0, rfid);
          });
          ToastUtil.success("成功添加新的电子编号");
        }
      },
      multiple: true,
      multipleScan: false,
      label: '电子编号',
      multiplePlaceholder: '未识别',
      multipleFormat: '已识别 %d 枚电子编号',
    );
  }

  void _dealyScanCode(int scanTag, {int? dealy}) async {
    dealy ??= 800;
    _scanTag = scanTag;
    logger.d("开始扫码: $_scanTag");
    await Future.delayed(Duration(milliseconds: dealy));
    bool success = await ScanChannel.startScan();
    if (!success) {
      ToastUtil.error("扫码失败");
    }
  }

  void _handleScanCageCode(int tag) async {
    if (_isScanningTarget || _isScanningSource) return;
    setState(() {
      if (tag == 1) {
        _isScanningSource = true;
      } else if (tag == 2) {
        _isScanningTarget = true;
      }
    });
    _scanTag = tag;
    logger.d("开始扫码: $_scanTag");
    bool success = await ScanChannel.startScan();
    if (!success) {
      ToastUtil.error("扫码失败");
    }
  }

  void _handleChangeCageCode(int tag) {
    setState(() {
      if (tag == 1) {
        _sourceCageController.clear();
      } else {
        _targetCageController.clear();
      }
    });
    _dealyScanCode(tag);
  }

  // 移除指定索引的电子编号
  void _removeRfid(int index) {
    setState(() {
      _rfids.removeAt(index);
    });
  }

  // 清空所有已识别的电子编号
  void _clearRfids() {
    setState(() {
      _rfids.clear();
    });
    ToastUtil.info('已清空所有电子编号');
  }

  // 提交数据
  void _handleSubmit() {
    final data = {
      'source_cage': _sourceCageController.text,
      'target_cage': _targetCageController.text,
      'rfids': _rfids,
    };
    apis.breeding.submitApi
        .cageChange(data)
        .then((_) {
          if (mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(
                content: Text('换笼提交成功'),
                backgroundColor: Colors.green,
              ),
            );
            // 提交后重置表单
            setState(() {
              _sourceCageController.clear();
              _targetCageController.clear();
              _rfids.clear();
            });
          }
        })
        .catchError((err) {
          ToastUtil.error('换笼提交失败');
          if (mounted && err != null) {
            String errorMessage = err.toString();
            if (err is Exception) {
              errorMessage = err.toString();
            }
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(
                content: Text(errorMessage),
                backgroundColor: Colors.red,
              ),
            );
          }
        });
  }
}