import 'dart:async' show Future;
import 'dart:convert';
import 'package:event/event.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'package:pikapika/basic/Common.dart';

import '../Method.dart';

const _versionUrl =
    "https://api.github.com/repos/niuhuan/pikapika/releases/latest";
const _versionAssets = 'lib/assets/version.txt';

late String _version;
String? _latestVersion;
String? _latestVersionInfo;

const _propertyName = "checkVersionPeriod";
late int _period = -1;

Future initVersion() async {
  // 当前版本
  try {
    _version = (await rootBundle.loadString(_versionAssets)).trim();
  } catch (e) {
    _version = "dirty";
  }
  // 检查周期
  _period = int.parse(await method.loadProperty(_propertyName, "0"));
  if (_period > 0) {
    if (DateTime.now().millisecondsSinceEpoch > _period) {
      await method.saveProperty(_propertyName, "0");
      _period = 0;
    }
  }
}

var versionEvent = Event<EventArgs>();

String currentVersion() {
  return _version;
}

String? latestVersion() {
  return _latestVersion;
}

String? latestVersionInfo() {
  return _latestVersionInfo;
}

Future autoCheckNewVersion() {
  if (_period != 0) {
    // -1 不检查, >0 未到检查时间
    return Future.value();
  }
  return _versionCheck();
}

Future manualCheckNewVersion(BuildContext context) async {
  try {
    defaultToast(context, "检查更新中");
    await _versionCheck();
    defaultToast(context, "检查更新成功");
  } catch (e) {
    defaultToast(context, "检查更新失败 : $e");
  }
}

bool dirtyVersion() {
  return "dirty" == _version;
}

// maybe exception
Future _versionCheck() async {
  if (!dirtyVersion()) {
    // 检查更新只能使用defaultHttpClient, 而不能使用pika的client, 否则会 "tls handshake failure"
    var json = jsonDecode(await method.defaultHttpClientGet(_versionUrl));
    if (json["name"] != null) {
      String latestVersion = (json["name"]);
      if (latestVersion != _version) {
        _latestVersion = latestVersion;
        _latestVersionInfo = json["body"] ?? "";
      }
    }
  } // else dirtyVersion
  versionEvent.broadcast();
}

String _periodText() {
  if (_period < 0) {
    return "自动检查更新已关闭";
  }
  if (_period == 0) {
    return "自动检查更新已开启";
  }
  return "下次检查时间 : " +
      formatDateTimeToDateTime(
        DateTime.fromMillisecondsSinceEpoch(_period),
      );
}

Future _choosePeriod(BuildContext context) async {
  var result = await chooseListDialog(
    context,
    "自动检查更新",
    ["开启", "一周后", "一个月后", "一年后", "关闭"],
    tips: "重启后红点会消失",
  );
  switch (result) {
    case "开启":
      await method.saveProperty(_propertyName, "0");
      _period = 0;
      break;
    case "一周后":
      var time = DateTime.now().millisecondsSinceEpoch + (1000 * 3600 * 24 * 7);
      await method.saveProperty(_propertyName, "$time");
      _period = time;
      break;
    case "一个月后":
      var time =
          DateTime.now().millisecondsSinceEpoch + (1000 * 3600 * 24 * 30);
      await method.saveProperty(_propertyName, "$time");
      _period = time;
      break;
    case "一年后":
      var time =
          DateTime.now().millisecondsSinceEpoch + (1000 * 3600 * 24 * 365);
      await method.saveProperty(_propertyName, "$time");
      _period = time;
      break;
    case "关闭":
      await method.saveProperty(_propertyName, "-1");
      _period = -1;
      break;
  }
}

Widget autoUpdateCheckSetting() {
  return StatefulBuilder(
    builder: (BuildContext context, void Function(void Function()) setState) {
      return ListTile(
        title: const Text("自动检查更新"),
        subtitle: Text(_periodText()),
        onTap: () async {
          await _choosePeriod(context);
          setState(() {});
        },
      );
    },
  );
}

String formatDateTimeToDateTime(DateTime c) {
  try {
    return "${add0(c.year, 4)}-${add0(c.month, 2)}-${add0(c.day, 2)} ${add0(c.hour, 2)}:${add0(c.minute, 2)}";
  } catch (e) {
    return "-";
  }
}