Implement search history for Look Up page

1 files changed, 60 insertions, 0 deletions

diff --git a/Hutch/Views/Lookup/LookupHistoryStore.swift b/Hutch/Views/Lookup/LookupHistoryStore.swift
new file mode 100644
index 0000000..e127970
--- /dev/null
+++ b/Hutch/Views/Lookup/LookupHistoryStore.swift
@@ -0,0 +1,60 @@
+import Foundation
+
+struct LookupHistoryEntry: Codable, Hashable, Identifiable, Sendable {
+    let type: LookupType
+    let query: String
+    let createdAt: Date
+
+    var id: String {
+        "\(type.rawValue):\(query)"
+    }
+}
+
+enum LookupHistoryStore {
+    private static let maximumEntries = 20
+
+    static func load(defaults: UserDefaults = .standard) -> [LookupHistoryEntry] {
+        guard let data = defaults.data(forKey: AppStorageKeys.lookupHistory) else {
+            return []
+        }
+
+        do {
+            return try JSONDecoder().decode([LookupHistoryEntry].self, from: data)
+        } catch {
+            defaults.removeObject(forKey: AppStorageKeys.lookupHistory)
+            return []
+        }
+    }
+
+    static func record(
+        type: LookupType,
+        query: String,
+        defaults: UserDefaults = .standard,
+        now: Date = .now
+    ) {
+        let normalizedQuery = query.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !normalizedQuery.isEmpty else { return }
+
+        var entries = load(defaults: defaults)
+        entries.removeAll { $0.type == type && $0.query == normalizedQuery }
+        entries.insert(
+            LookupHistoryEntry(type: type, query: normalizedQuery, createdAt: now),
+            at: 0
+        )
+
+        if entries.count > maximumEntries {
+            entries = Array(entries.prefix(maximumEntries))
+        }
+
+        save(entries, defaults: defaults)
+    }
+
+    static func clear(defaults: UserDefaults = .standard) {
+        defaults.removeObject(forKey: AppStorageKeys.lookupHistory)
+    }
+
+    private static func save(_ entries: [LookupHistoryEntry], defaults: UserDefaults) {
+        guard let data = try? JSONEncoder().encode(entries) else { return }
+        defaults.set(data, forKey: AppStorageKeys.lookupHistory)
+    }
+}