Energy

Read more about the Energies system in Hiro here.

Initializing the energies system #

The energies system relies on the Nakama System and an ILogger, both must be passed in as dependencies via the constructor.

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var energiesSystem = new EnergiesSystem(logger, nakamaSystem);
systems.Add(energiesSystem);

Subscribing to changes in the energy system #

You can listen for changes in the energy system so that you can respond appropriately, such as updating the UI, by implementing the IObserver pattern, or use the SystemObserver<T> type which handles it for you.

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var disposer = SystemObserver<EnergiesSystem>.Create(energiesSystem, system => {
    Instance.Logger.Info($"System updated.");

    // Update UI elements etc as necessary here...
});

Refreshing the energy system #

To ensure the energy system has the latest information from Nakama you can refresh it.

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await energiesSystem.RefreshAsync();

Listing available energy #

You can list the available energies for a user.

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foreach (var energyKvp in energiesSystem.Energies)
{
    var name = energyKvp.Key;
    var energy = energyKvp.Value;

    Debug.Log($"Energy {name} ({energy.Current}/{energy.Max})");
    Debug.Log($"Next refill in {(energy.NextRefillTimeSec - energy.CurrentTimeSec) / 1000}s");
}

Spending energy #

You can spend energy as a user, either as a single energy at a time or as multiple at once.

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// Spend a single energy
await energiesSystem.SpendEnergyAsync("lives", 1);

// Spend multiple energies
await energiesSystem.SpendEnergyAsync(new Dictionary<string, int>
{
    { "lives", 1 },
    { "hearts", 5 }
});

Spending energy with a custom refill start time #

Spend energy and specify when the refill timer should start. Pass a map of EnergySpendWithTime to set a different start time per energy.

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var spends = new Dictionary<string, EnergySpendWithTime>
{
    { "hearts", new EnergySpendWithTime { Amount = 1, RefillStartTimeDecoded = DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString() } },
    { "stamina", new EnergySpendWithTime { Amount = 3, RefillStartTimeDecoded = DateTimeOffset.UtcNow.AddMinutes(-5).ToUnixTimeSeconds().ToString() } }
};

await energiesSystem.SpendEnergyWithRefillStartTimeAsync(spends);

To apply the same refill start time to all energies at once, pass a spend map and a shared Unix timestamp.

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var energies = new Dictionary<string, int>
{
    { "hearts", 1 },
    { "stamina", 3 }
};
var refillStartTime = DateTimeOffset.UtcNow.ToUnixTimeSeconds();

await energiesSystem.SpendEnergyWithRefillStartTimeAsync(energies, refillStartTime);

Granting energy #

While energy can be granted as part of a reward, you can also grant it directly.

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await energiesSystem.GrantAsync(new Dictionary<string, int>
{
    { "lives", 1 },
    { "hearts", 5 }
});

Additional information #