import 'package:flutter/material.dart';
import '../../models/record.dart';

class MonthlyOverview extends StatelessWidget {
  final List<Record> records;
  final bool isYearView;

  const MonthlyOverview({
    Key? key,
    required this.records,
    this.isYearView = false,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final totalExpense = records
        .where((r) => r.type == RecordType.expense)
        .fold(0.0, (sum, r) => sum + r.amount);
    
    final totalIncome = records
        .where((r) => r.type == RecordType.income)
        .fold(0.0, (sum, r) => sum + r.amount);
    
    final balance = totalIncome - totalExpense;
    
    // 计算日均支出
    final daysInPeriod = isYearView 
        ? (records.isNotEmpty ? _getDaysInYear(records.first.createTime.year) : 365)
        : (records.isNotEmpty ? _getDaysInMonth(records.first.createTime) : 30);
    final dailyAverage = totalExpense / daysInPeriod;

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(12),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        children: [
          Row(
            children: [
              Expanded(
                child: _buildOverviewItem(
                  label: '${isYearView ? "年" : "月"}支出',
                  amount: totalExpense,
                  textColor: Colors.red,
                ),
              ),
              Expanded(
                child: _buildOverviewItem(
                  label: '${isYearView ? "年" : "月"}收入',
                  amount: totalIncome,
                  textColor: Colors.green,
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          Row(
            children: [
              Expanded(
                child: _buildOverviewItem(
                  label: '结余',
                  amount: balance,
                  textColor: balance >= 0 ? Colors.green : Colors.red,
                  showSign: true,
                ),
              ),
              Expanded(
                child: _buildOverviewItem(
                  label: '日均支出',
                  amount: dailyAverage,
                  textColor: Colors.grey[800]!,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  int _getDaysInMonth(DateTime date) {
    return DateTime(date.year, date.month + 1, 0).day;
  }

  int _getDaysInYear(int year) {
    return DateTime(year).isLeapYear ? 366 : 365;
  }

  Widget _buildOverviewItem({
    required String label,
    required double amount,
    required Color textColor,
    bool showSign = false,
  }) {
    String amountText = '¥${amount.toStringAsFixed(2)}';
    if (showSign && amount > 0) {
      amountText = '+$amountText';
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: TextStyle(
            fontSize: 14,
            color: Colors.grey[600],
          ),
        ),
        const SizedBox(height: 4),
        Text(
          amountText,
          style: TextStyle(
            fontSize: 20,
            fontWeight: FontWeight.bold,
            color: textColor,
          ),
        ),
      ],
    );
  }
}

extension DateTimeExtension on DateTime {
  bool get isLeapYear {
    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
  }
}