perf: cache danbooru page token floor and reuse search-history payloadsHEADmain

1 files changed, 63 insertions, 0 deletions

diff --git a/SoraTests/ViewDerivedDataTests.swift b/SoraTests/ViewDerivedDataTests.swift
index 6a27667..d19b51a 100644
--- a/SoraTests/ViewDerivedDataTests.swift
+++ b/SoraTests/ViewDerivedDataTests.swift
@@ -872,6 +872,69 @@ final class ViewDerivedDataTests: XCTestCase {  // swiftlint:disable:this type_b
     )
   }
 
+  func testBooruManagerDanbooruPaginationCachesMinimumPostIDForCursorToken() throws {
+    let source = try loadSource(at: "Sora/Data/Booru/BooruManager.swift")
+    let pageTokenFunctionSection = try extractFunction(
+      named: "private func danbooruPageToken(for page: Int, tags: [String]) -> String",
+      from: source
+    )
+    let updatePostsSection = try extractFunction(
+      named: "private func updatePosts(_ newPosts: [BooruPost], replace: Bool)",
+      from: source
+    )
+    let cachedMinimumPostIDStorageCount = tokenCount(
+      matching: #"private\s+var\s+cachedMinimumPostID:\s*Int\?"#,
+      in: source
+    )
+    let cachedTokenGuardCount = tokenCount(
+      matching: #"guard\s+let\s+minimumPostID\s*=\s*cachedMinimumPostID"#,
+      in: pageTokenFunctionSection
+    )
+    let directPostsMinScanCount = tokenCount(
+      matching: #"posts\s*\.\s*lazy\s*\.\s*compactMap\s*\(\s*\{\s*Int\(\$0\.id\)\s*\}\s*\)\s*\.\s*min"#,
+      in: pageTokenFunctionSection
+    )
+    let cacheInvalidationOnReplaceCount = tokenCount(
+      matching: #"cachedMinimumPostID\s*=\s*nil"#,
+      in: updatePostsSection
+    )
+    let cacheRefreshCount = tokenCount(
+      matching: #"cachedMinimumPostID\s*=\s*min\("#,
+      in: updatePostsSection
+    )
+
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      cachedMinimumPostIDStorageCount,
+      0,
+      "BooruManager should store a cached minimum post ID for Danbooru pagination."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      cachedTokenGuardCount,
+      0,
+      "Danbooru page token generation should use cached minimum post ID."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertEqual(
+      directPostsMinScanCount,
+      0,
+      "Danbooru page token generation should avoid rescanning all posts for minimum ID."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      cacheInvalidationOnReplaceCount,
+      0,
+      "Replacing posts should invalidate cached Danbooru minimum post ID."
+    )
+    // swiftlint:disable:next prefer_nimble
+    XCTAssertGreaterThan(
+      cacheRefreshCount,
+      0,
+      "Appending posts should refresh cached Danbooru minimum post ID incrementally."
+    )
+  }
+
   func testBooruManagerDoesNotForceClientSidePostResort() throws {
     let source = try loadSource(at: "Sora/Data/Booru/BooruManager.swift")
     let retrySection = try extractFunction(