Fix nostr event fetching issues

spec/services/nostr_manager/fetch_latest_event_spec.rb

@@ -0,0 +1,88 @@
+require 'rails_helper'
+
+RSpec.describe NostrManager::FetchLatestEvent, type: :model do
+  let(:filter) { Nostr::Filter.new(authors: ["pubkey"], kinds: [0], limit: 1) }
+  let(:event_v1) { { "id" => "aaa", "created_at" => 1000, "content" => "v1" } }
+  let(:event_v2) { { "id" => "bbb", "created_at" => 2000, "content" => "v2" } }
+
+  describe "with no events found" do
+    it "returns nil" do
+      allow(NostrManager::FetchEvent).to receive(:call).and_return(nil)
+
+      result = described_class.call(relays: ["wss://a", "wss://b"], filter: filter)
+      expect(result).to be_nil
+    end
+  end
+
+  describe "with event on 1 relay only" do
+    it "returns the event" do
+      allow(NostrManager::FetchEvent).to receive(:call) do |args|
+        case args[:relay_url]
+        when "wss://a" then event_v1
+        else nil
+        end
+      end
+
+      result = described_class.call(
+        relays: ["wss://a", "wss://b", "wss://c"], filter: filter
+      )
+      expect(result).to eq(event_v1)
+    end
+  end
+
+  describe "with events on 2 relays, different versions" do
+    it "returns the latest event (max created_at)" do
+      allow(NostrManager::FetchEvent).to receive(:call) do |args|
+        case args[:relay_url]
+        when "wss://a" then event_v1
+        when "wss://b" then event_v2
+        end
+      end
+
+      result = described_class.call(relays: ["wss://a", "wss://b"], filter: filter)
+      expect(result).to eq(event_v2)
+    end
+  end
+
+  describe "with duplicate events (same ID) on 2 relays" do
+    it "returns the single event without double-counting" do
+      allow(NostrManager::FetchEvent).to receive(:call).and_return(event_v1)
+
+      result = described_class.call(relays: ["wss://a", "wss://b"], filter: filter)
+      expect(result).to eq(event_v1)
+    end
+  end
+
+  describe "with timeout after finding 1 event" do
+    it "still returns the found event" do
+      allow(NostrManager::FetchEvent).to receive(:call) do |args|
+        case args[:relay_url]
+        when "wss://a" then event_v1
+        when "wss://b" then raise Timeout::Error
+        end
+      end
+
+      result = described_class.call(relays: ["wss://a", "wss://b"], filter: filter)
+      expect(result).to eq(event_v1)
+    end
+  end
+
+  describe "with max_events reached" do
+    it "stops querying further relays" do
+      call_count = 0
+      allow(NostrManager::FetchEvent).to receive(:call) do |args|
+        call_count += 1
+        raise "should not query wss://c" if args[:relay_url] == "wss://c"
+        case args[:relay_url]
+        when "wss://a" then event_v1
+        when "wss://b" then event_v2
+        end
+      end
+
+      described_class.call(
+        relays: ["wss://a", "wss://b", "wss://c"], filter: filter
+      )
+      expect(call_count).to eq(2)
+    end
+  end
+end