Initial commit

Converters/BoolConverter.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ChrisKaczor.FeverClient.Converters
+{
+    public class BoolTimestampConverter : JsonConverter<bool>
+    {
+        public override bool Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType != JsonTokenType.Number)
+            {
+                throw new JsonException("Expected a numeric boolean value");
+            }
+
+            var number = reader.GetInt64();
+            return number == 1;
+        }
+
+        public override void Write(Utf8JsonWriter writer, bool value, JsonSerializerOptions options)
+        {
+            var number = value ? 1 : 0;
+            writer.WriteNumberValue(number);
+        }
+    }
+}

Converters/CommaSeparatedListConverter.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ChrisKaczor.FeverClient.Converters;
+
+internal class CommaSeparatedListConverter : JsonConverter<IEnumerable<int>>
+{
+    public override IEnumerable<int> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType != JsonTokenType.String)
+        {
+            throw new JsonException("Expected a string");
+        }
+
+        var commaSeparatedList = reader.GetString() ?? string.Empty;
+
+        return commaSeparatedList.Split(",").Select(int.Parse).AsEnumerable();
+    }
+
+    public override void Write(Utf8JsonWriter writer, IEnumerable<int> value, JsonSerializerOptions options)
+    {
+        var commaSeparatedList = string.Join(",", value);
+        writer.WriteStringValue(commaSeparatedList);
+    }
+}

Converters/EpochConverter.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ChrisKaczor.FeverClient.Converters;
+
+public class EpochConverter : JsonConverter<DateTimeOffset>
+{
+    public override DateTimeOffset Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType != JsonTokenType.Number)
+        {
+            throw new JsonException("Expected a numeric epoch timestamp");
+        }
+
+        var unixTimestamp = reader.GetInt64();
+        return DateTimeOffset.FromUnixTimeSeconds(unixTimestamp);
+    }
+
+    public override void Write(Utf8JsonWriter writer, DateTimeOffset value, JsonSerializerOptions options)
+    {
+        var unixTimestamp = value.ToUnixTimeSeconds();
+        writer.WriteNumberValue(unixTimestamp);
+    }
+}