46 lines
1.2 KiB
C#
46 lines
1.2 KiB
C#
using System.Text.Json;
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using Backend.DatabaseHandler;
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using Backend.Interface;
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namespace Backend.ServiceHandler;
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public sealed class PriceThresholdEvaluator : IAlertEvaluator
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{
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public string AlertType => "price_threshold";
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public Task<AlertEvaluation> EvaluateAsync(AlertRecord alert, MarketDataService marketData)
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{
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var parameters = JsonSerializer.Deserialize<PriceThresholdParameters>(alert.Parameters)
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?? throw new InvalidOperationException($"Invalid parameters for alert {alert.Id}");
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var snapshot = marketData.GetLiveQuote(alert.Symbol);
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if (!snapshot.LastPrice.HasValue)
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{
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return Task.FromResult(new AlertEvaluation { Triggered = false });
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}
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double price = snapshot.LastPrice.Value;
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bool triggered = parameters.Direction.ToLowerInvariant() switch
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{
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"above" => price >= parameters.Target,
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"below" => price <= parameters.Target,
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_ => false
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};
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string updatedState = JsonSerializer.Serialize(new { lastPrice = price });
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return Task.FromResult(new AlertEvaluation
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{
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Triggered = triggered,
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UpdatedLastState = updatedState
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});
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}
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private sealed class PriceThresholdParameters
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{
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public string Direction { get; set; } = string.Empty;
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public double Target { get; set; }
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}
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}
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