import 'package:flutter/material.dart';
import '../../../core/localization/app_localizations.dart';
import '../../../core/theme/app_theme.dart';
import '../../../shared/utils/constants.dart';
import '../../../shared/widgets/common_button.dart';
import '../../programs/models/step.dart' as models;

/// 步骤参数表单
class StepForm extends StatefulWidget {
  final int programId;
  final models.Step? step;
  final bool isNew;
  final void Function(models.Step) onSave;

  const StepForm({
    super.key,
    required this.programId,
    this.step,
    this.isNew = false,
    required this.onSave,
  });

  @override
  State<StepForm> createState() => _StepFormState();
}

class _StepFormState extends State<StepForm> {
  final _formKey = GlobalKey<FormState>();

  late TextEditingController _nameController;
  late TextEditingController _mixTimeController;
  late TextEditingController _magnetTimeController;
  late TextEditingController _volumeController;
  late TextEditingController _blowTimeController;

  String _position = 'A1';
  String _mixSpeed = '中速';
  String _blowSpeed = '中速';
  int _needleSpeed = 5;

  @override
  void initState() {
    super.initState();
    _nameController = TextEditingController(text: widget.step?.name ?? '');
    _mixTimeController = TextEditingController(text: '${widget.step?.mixTime ?? 0}');
    _magnetTimeController = TextEditingController(text: '${widget.step?.magnetTime ?? 0}');
    _volumeController = TextEditingController(text: '${widget.step?.volume ?? 0}');
    _blowTimeController = TextEditingController(text: '${widget.step?.blowTime ?? 0}');

    _position = widget.step?.position ?? 'A1';
    _mixSpeed = widget.step?.mixSpeed ?? '中速';
    _blowSpeed = widget.step?.blowSpeed ?? '中速';
    _needleSpeed = widget.step?.needleSpeed ?? 5;
  }

  @override
  void dispose() {
    _nameController.dispose();
    _mixTimeController.dispose();
    _magnetTimeController.dispose();
    _volumeController.dispose();
    _blowTimeController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);

    return Padding(
      padding: const EdgeInsets.all(24),
      child: Form(
        key: _formKey,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 标题
            Text(
              widget.isNew ? '添加步骤' : '编辑步骤',
              style: TextStyle(
                color: AppTheme.textPrimary,
                fontSize: 18,
                fontWeight: FontWeight.w600,
              ),
            ),
            const SizedBox(height: 24),

            // 步骤名称
            TextFormField(
              controller: _nameController,
              decoration: InputDecoration(
                labelText: l10n?.stepName ?? '步骤名称',
                hintText: '例如: 混合、吸磁、吹气',
                border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
              ),
              validator: (value) {
                if (value == null || value.trim().isEmpty) {
                  return '请输入步骤名称';
                }
                return null;
              },
            ),
            const SizedBox(height: 16),

            // 孔位选择
            Row(
              children: [
                Text(l10n?.position ?? '孔位', style: TextStyle(color: AppTheme.textPrimary)),
                const SizedBox(width: 16),
                Expanded(
                  child: DropdownButtonFormField<String>(
                    value: _position,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    items: Constants.positions.map((p) => DropdownMenuItem(value: p, child: Text(p))).toList(),
                    onChanged: (value) {
                      if (value != null) setState(() => _position = value);
                    },
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // 时间参数行
            Row(
              children: [
                Expanded(
                  child: TextFormField(
                    controller: _mixTimeController,
                    decoration: InputDecoration(
                      labelText: '${l10n?.mixTime ?? '混合时间'} (${Constants.timeUnitSeconds})',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    keyboardType: TextInputType.number,
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: TextFormField(
                    controller: _magnetTimeController,
                    decoration: InputDecoration(
                      labelText: '${l10n?.magnetTime ?? '吸磁时间'} (${Constants.timeUnitSeconds})',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    keyboardType: TextInputType.number,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // 容积和吹气时间
            Row(
              children: [
                Expanded(
                  child: TextFormField(
                    controller: _volumeController,
                    decoration: InputDecoration(
                      labelText: '${l10n?.volume ?? '容积'} (${Constants.volumeUnit})',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    keyboardType: TextInputType.number,
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: TextFormField(
                    controller: _blowTimeController,
                    decoration: InputDecoration(
                      labelText: '${l10n?.blowTime ?? '吹气时间'} (${Constants.timeUnitMinutes})',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    keyboardType: TextInputType.number,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // 速度选择
            Row(
              children: [
                Expanded(
                  child: DropdownButtonFormField<String>(
                    value: _mixSpeed,
                    decoration: InputDecoration(
                      labelText: l10n?.mixSpeed ?? '混合速度',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    items: Constants.speedOptions.map((s) => DropdownMenuItem(value: s, child: Text(s))).toList(),
                    onChanged: (value) {
                      if (value != null) setState(() => _mixSpeed = value);
                    },
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: DropdownButtonFormField<String>(
                    value: _blowSpeed,
                    decoration: InputDecoration(
                      labelText: l10n?.blowSpeed ?? '吹气速度',
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                    ),
                    items: Constants.speedOptions.map((s) => DropdownMenuItem(value: s, child: Text(s))).toList(),
                    onChanged: (value) {
                      if (value != null) setState(() => _blowSpeed = value);
                    },
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // 下针速度滑块
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('${l10n?.needleSpeed ?? '下针速度'}: $_needleSpeed 档', style: TextStyle(color: AppTheme.textPrimary)),
                Slider(
                  value: _needleSpeed.toDouble(),
                  min: 1,
                  max: 10,
                  divisions: 9,
                  activeColor: AppTheme.primaryColor,
                  onChanged: (value) {
                    setState(() => _needleSpeed = value.round());
                  },
                ),
              ],
            ),

            const SizedBox(height: 24),

            // 保存按钮
            CommonButton(
              text: l10n?.save ?? '保存',
              icon: Icons.save,
              type: ButtonType.primary,
              onPressed: _saveStep,
            ),
          ],
        ),
      ),
    );
  }

  /// 保存步骤
  void _saveStep() {
    if (!_formKey.currentState!.validate()) return;

    final step = models.Step(
      id: widget.step?.id,
      programId: widget.programId,
      stepNo: widget.step?.stepNo ?? 1,
      position: _position,
      name: _nameController.text.trim(),
      mixTime: int.tryParse(_mixTimeController.text) ?? 0,
      magnetTime: int.tryParse(_magnetTimeController.text) ?? 0,
      volume: int.tryParse(_volumeController.text) ?? 0,
      mixSpeed: _mixSpeed,
      blowSpeed: _blowSpeed,
      blowTime: int.tryParse(_blowTimeController.text) ?? 0,
      needleSpeed: _needleSpeed,
    );

    widget.onSave(step);
  }
}