import 'package:flisp_app/models/reminder.dart';
import 'package:flisp_app/provider/reminder_provider.dart';
import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import 'package:flisp_app/utils/date_utils.dart';

class ReminderForm extends StatefulWidget {
  final GlobalKey<FormBuilderState> formKey;
  final bool isEditing;
  final Reminder? initialReminder;

  const ReminderForm({
    super.key,
    required this.formKey,
    required this.isEditing,
    this.initialReminder,
  });

  @override
  State<ReminderForm> createState() => _ReminderFormState();
}

class _ReminderFormState extends State<ReminderForm> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final int maxTitleCount = 10;
    final int maxContentCount = 20;
    final provider = Provider.of<ReminderProvider>(context);

    Widget buildTitle() {
      return Row(
        children: [
          Icon(
            widget.isEditing ? Icons.edit_note : Icons.add_task,
            color: Colors.orange,
            size: 24,
          ),
          SizedBox(width: 8),
          Text(
            widget.isEditing ? '编辑提醒事项' : '添加提醒事项',
            style: TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.bold,
              color: Colors.orange,
            ),
          ),
        ],
      );
    }

    FormBuilderTextField buildTitleField() {
      return FormBuilderTextField(
        name: 'title',
        initialValue: provider.formItem.title,
        onChanged: (value) {
          setState(() {
            provider.formItem.title = value ?? '';
          });
        },
        decoration: InputDecoration(
          labelText: '标题',
          hintText: '请输入提醒事项标题...',
          counterText: '',
          suffixText: '${provider.formItem.title.length}/$maxTitleCount',
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.orange),
          ),
          filled: true,
          fillColor: Colors.white,
          prefixIcon: Icon(Icons.title, color: Colors.blue),
          contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 14),
        ),
        maxLength: maxTitleCount,
        validator: (value) {
          if (value == null || value.isEmpty) {
            return '请输入标题';
          }
          if (value.length > maxTitleCount) {
            return '标题不能超过$maxTitleCount个字符';
          }
          return null;
        },
      );
    }

    FormBuilderTextField buildContentField() {
      return FormBuilderTextField(
        name: 'content',
        initialValue: provider.formItem.content,
        onChanged: (value) {
          setState(() {
            provider.formItem.content = value ?? '';
          });
        },
        decoration: InputDecoration(
          labelText: '内容',
          hintText: '请输入提醒事项内容...',
          counterText: '',
          suffixText: '${provider.formItem.content.length}/$maxContentCount',
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.orange),
          ),
          filled: true,
          fillColor: Colors.white,
          prefixIcon: Icon(Icons.description, color: Colors.green),
          contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 14),
        ),
        maxLines: 2,
        maxLength: maxContentCount,
        validator: (value) {
          if (value != null && value.length > maxContentCount) {
            return '内容不能超过$maxContentCount个字符';
          }
          return null;
        },
      );
    }

    FormBuilderDateTimePicker buildDateField() {
      return FormBuilderDateTimePicker(
        name: 'dueDate',
        format: DateFormat('yyyy-MM-dd HH:mm:ss'),
        initialValue: provider.formItem.scheduledTime,
        inputType: InputType.both,
        onChanged: (value) {
          setState(() {
            provider.formItem.scheduledTime = value!;
          });
        },
        decoration: InputDecoration(
          labelText: '提醒时间',
          labelStyle: TextStyle(color: Colors.black87),
          prefixIcon: Icon(Icons.calendar_today, color: Colors.purple),
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.grey.shade200),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: BorderSide(color: Colors.orange),
          ),
          filled: true,
          fillColor: Colors.white,
          contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 14),
        ),
        validator: (value) {
          if (value != null && value.isBefore(DateTime.now())) {
            return '不能选择过去的时间';
          }
          return null;
        },
      );
    }

    FormBuilder buildForm() {
      return FormBuilder(
        key: widget.formKey,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            buildTitleField(),
            SizedBox(height: 12),
            buildContentField(),
            SizedBox(height: 12),
            buildDateField(),
          ],
        ),
      );
    }

    return Padding(
      padding: const EdgeInsets.all(16),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [buildTitle(), SizedBox(height: 20), buildForm()],
      ),
    );
  }
}