final

BlueLaminate/BlueLaminate.Core/Tradeups/TradeupGraph.cs

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+namespace BlueLaminate.Core.Tradeups;
+
+/// <summary>
+/// A skin that can come OUT of a tradeup, carrying the float bounds needed to map an
+/// input average float onto this skin's own wear range. <see cref="StatTrakAvailable"/>
+/// is recorded so the listing-side query (Phase C) can filter ST vs non-ST outputs;
+/// the graph itself is ST-agnostic.
+/// </summary>
+public sealed record TradeupOutputSkin(
+    int SkinId,
+    string Name,
+    decimal FloatMin,
+    decimal FloatMax,
+    bool StatTrakAvailable);
+
+/// <summary>
+/// One tradeup "recipe slot": all eligible input skins of a single rarity within one
+/// collection, and the set of output skins they produce (the next rarity tier present
+/// in that collection). For a single-collection contract, ten inputs are drawn from
+/// <see cref="InputSkinIds"/> and each of <see cref="OutputSkins"/> is an equally likely
+/// outcome, so k_C = <c>OutputSkins.Count</c>.
+/// </summary>
+public sealed record TradeupInputGroup(
+    int CollectionId,
+    string CollectionName,
+    WeaponRarity InputRarity,
+    WeaponRarity OutputRarity,
+    IReadOnlyList<int> InputSkinIds,
+    IReadOnlyList<TradeupOutputSkin> OutputSkins);
+
+/// <summary>
+/// The full tradeup reference graph derived from the static catalogue: every
+/// (collection, input rarity) → (output rarity, output skins) edge that yields a
+/// 10-input weapon tradeup. Built once per process from the monthly-synced catalogue
+/// (see <see cref="TradeupGraphBuilder"/>); contains no pricing or listing data.
+/// </summary>
+public sealed record TradeupGraph(IReadOnlyList<TradeupInputGroup> Groups);