Added the catalogue models and seed to support phase 5 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Public/Models/Want.swift

@@ -0,0 +1,78 @@
+import Foundation
+
+/// A `Sendable` snapshot of a copy an account is looking for, with the listings that meet it.
+public struct Want: Sendable, Equatable {
+
+    // MARK: Properties
+
+    /// The want's identifier.
+    public let id: UUID
+    /// What is wanted: words that must each appear in a listing's title, e.g. `Nightward #7`.
+    public let title: String
+    /// The lowest grade wanted, or `nil` for any.
+    public let minGrade: Double?
+    /// The most the account would pay, in euro cents, or `nil` for any price.
+    public let maxPriceCents: Int?
+    /// Whether only slabbed copies are wanted.
+    public let slabbedOnly: Bool
+    /// Whether new matches alert the account.
+    public let alerts: Bool
+    /// The listings for sale that meet the want, newest first. Wants match within the EU alone.
+    public let matches: [Listing]
+    /// The number of matches listed since the account last looked at its wants.
+    public let newMatchCount: Int
+
+    // MARK: Initializers
+
+    public init(
+        id: UUID,
+        title: String,
+        minGrade: Double?,
+        maxPriceCents: Int?,
+        slabbedOnly: Bool,
+        alerts: Bool,
+        matches: [Listing],
+        newMatchCount: Int
+    ) {
+        self.id = id
+        self.title = title
+        self.minGrade = minGrade
+        self.maxPriceCents = maxPriceCents
+        self.slabbedOnly = slabbedOnly
+        self.alerts = alerts
+        self.matches = matches
+        self.newMatchCount = newMatchCount
+    }
+
+}
+
+// MARK: - Extensions
+
+public extension Want {
+
+    // MARK: Computed
+
+    /// The filter finding the want's matches: the title's words, within the limits set, shipping from the EU.
+    var filter: ListingFilter {
+        Self.filter(title: title, minGrade: minGrade, maxPriceCents: maxPriceCents, slabbedOnly: slabbedOnly)
+    }
+
+    // MARK: Methods
+
+    /// The filter finding a want's matches.
+    static func filter(
+        title: String,
+        minGrade: Double?,
+        maxPriceCents: Int?,
+        slabbedOnly: Bool
+    ) -> ListingFilter {
+        .init(
+            query: title.replacingOccurrences(of: "·", with: " "),
+            isSlabbed: slabbedOnly ? true : nil,
+            gradeMin: minGrade,
+            priceMax: maxPriceCents,
+            shipsFrom: .eu
+        )
+    }
+
+}