import 'dart:io';

import 'package:intl/intl.dart';
import 'package:path_provider/path_provider.dart';

class AppUtils {

  static String getAge(DateTime brt) {
    int age = 0;
    DateTime dateTime = DateTime.now();
    if (dateTime.isBefore(brt)) {
      //出生日期晚于当前时间，无法计算
      return '出生日期不正確';
    }
    int yearNow = dateTime.year; //当前年份
    int monthNow = dateTime.month; //当前月份
    int dayOfMonthNow = dateTime.day; //当前日期

    int yearBirth = brt.year;
    int monthBirth = brt.month;
    int dayOfMonthBirth = brt.day;
    age = yearNow - yearBirth; //计算整岁数
    if (monthNow <= monthBirth) {
      if (monthNow == monthBirth) {
        if (dayOfMonthNow < dayOfMonthBirth) age--; //当前日期在生日之前，年龄减一
      } else {
        age--; //当前月份在生日之前，年龄减一
      }
    }
    return age.toString();
  }

  static String getAgeByString(String birth) {
    if (birth == null || birth == "") return "";
    int age = 0;
    DateTime brt = DateFormat("yyyy-MM-dd").parse(birth);

    DateTime dateTime = DateTime.now();
    if (dateTime.isBefore(brt)) {
      //出生日期晚于当前时间，无法计算
      return '出生日期不正確';
    }
    int yearNow = dateTime.year; //当前年份
    int monthNow = dateTime.month; //当前月份
    int dayOfMonthNow = dateTime.day; //当前日期

    int yearBirth = brt.year;
    int monthBirth = brt.month;
    int dayOfMonthBirth = brt.day;
    age = yearNow - yearBirth; //计算整岁数
    if (monthNow <= monthBirth) {
      if (monthNow == monthBirth) {
        if (dayOfMonthNow < dayOfMonthBirth) age--; //当前日期在生日之前，年龄减一
      } else {
        age--; //当前月份在生日之前，年龄减一
      }
    }
    return age.toString();
  }

  static String getHourMinuteByString(String birth) {
    if (birth == null || birth == "") return "";
    DateTime brt = DateFormat("yyyy-MM-dd HH:mm:ss").parse(birth);
    return DateFormat("HH:mm").format(brt);
  }

  static String getHourMinuteAfter30mByString(String birth) {
    if (birth == null || birth == "") return "";
    DateTime brt = DateFormat("yyyy-MM-dd HH:mm:ss").parse(birth);
    DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(brt.millisecondsSinceEpoch + 30 * 60 * 1000);
    return DateFormat("HH:mm").format(dateTime); //分钟
  }

  /// 获取缓存大小
  static Future<int> total() async {
    Directory tempDir = await getTemporaryDirectory();
    if (tempDir == null) return 0;
    int total = await _reduce(tempDir);
    return total;
  }

  /// 清除缓存
  static Future<int> clear() async {
    Directory tempDir = await getTemporaryDirectory();
    if (tempDir == null) return 0;
    await _delete(tempDir);
  }

  /// 递归缓存目录，计算缓存大小
  static Future<int> _reduce(FileSystemEntity file) async {
    /// 如果是一个文件，则直接返回文件大小
    if (file is File) {
      int length = await file.length();
      return length;
    }
    /// 如果是目录，则遍历目录并累计大小
    if (file is Directory) {
      final List<FileSystemEntity> children = file.listSync();
      int total = 0;
      if (children != null && children.isNotEmpty)
        for (final FileSystemEntity child in children)
          total += await _reduce(child);
      return total;
    }
    return 0;
  }

  /// 递归删除缓存目录和文件
  static Future<int> _delete(FileSystemEntity file) async {
    if (file is Directory) {
      final List<FileSystemEntity> children = file.listSync();
      for (final FileSystemEntity child in children) {
        await child.delete(recursive: true);
      }
    } else {
      await file.delete();
    }
  }

  /// 递归删除缓存目录和文件
  static Future<int> deleteDirectory(FileSystemEntity file) async {
    if (file is Directory) {
      final List<FileSystemEntity> children = file.listSync();
      for (final FileSystemEntity child in children) {
        child.deleteSync(recursive: true);
      }
    }
  }

}