using System;
using System.Globalization;
using game;
using JetBrains.Annotations;
using UniRx;

public class DailyReward : ITimeReward
{
    public bool IsAvailable => _enterTime != null; //TODO: to reactive
    public int DayIndex { get; private set; } = 0;
    public int DaysCount => _rewards.days.Count;

    private DateTime _lastEntryTime = default;
    private DateTime _nextRewardTime = default;
    private readonly ConfDailyReward _rewards;
    private DateTime? _enterTime = null;

    public DailyReward(ConfDailyReward conf)
    {
        _rewards = conf;
        NetTime.Instance.IsAvailableAsObservable()
            .Subscribe(x =>
            {
                _enterTime = x ? (DateTime?)NetTime.Instance.Time : null;
            });
    }

    private bool HasRewardNotReceived()
    {
        return _enterTime >= _nextRewardTime || DayIndex <= 0;
    }

    public ConfRewardItem GetItemForTheDay(int day)
    {
        ConfDailyRewardDay dailyReward = _rewards.days[day];
        ConfDailyRewardItemsCollection itemsCollection = dailyReward.items;
        for (var i = 0; i < itemsCollection.uniqueItems.Count; i++)
        {
            var rewardItem = itemsCollection.uniqueItems[i];
            if (global::Save.Inventory.IsPurchasedItem(rewardItem.item.protoId) == false)
                return rewardItem;
        }

        return itemsCollection.reserveItem;
    }

    public bool TryGetReward([CanBeNull] out ConfRewardItem reward)
    {
        reward = null;

        if (RewardIsWasted())
        {
            ResetReward();
            return false;
        }

        if (HasRewardNotReceived())
            reward = GetItemForTheDay(DayIndex);
        else
            return false;

        return reward != null;
    }

    private void ResetReward()
    {
        DayIndex = 0;
        ResetTime();
    }

    private void ResetTime()
    {
        _lastEntryTime = NetTime.Instance.Time;
        _nextRewardTime = _lastEntryTime.AddHours(24);
    }

    public void Load(DataGame data)
    {
        DayIndex = (int)data.timeRewards.daily.dayIndex;

        if (string.IsNullOrEmpty(data.timeRewards.daily.lastEntryTime))
        {
            ResetTime();
        }
        else
        {
            _lastEntryTime = DateTime.Parse(data.timeRewards.daily.lastEntryTime);
            _nextRewardTime = DateTime.Parse(data.timeRewards.daily.nextRewardTime);
        }
    }

    private bool RewardIsWasted()
    {
        if (IsAvailable == false)
            return false;

        DateTime currentTime = (DateTime)_enterTime;
        DateTime nextRewardTime = _nextRewardTime;

        double current = currentTime.ToStamp();
        double next = nextRewardTime.ToStamp();

        return current - next > 60 * 60 * 24;
    }

    public void Save(DataGame data)
    {
        data.timeRewards.daily.dayIndex = (uint) DayIndex;
        data.timeRewards.daily.lastEntryTime = _lastEntryTime.ToString(CultureInfo.InvariantCulture);
        data.timeRewards.daily.nextRewardTime = _nextRewardTime.ToString(CultureInfo.InvariantCulture);
    }
}