Reactions View

Changelog-Added: Added Reactions View

damus/Models/ReactionsModel.swift

@@ -0,0 +1,75 @@
+//
+//  LikesModel.swift
+//  damus
+//
+//  Created by William Casarin on 2023-01-11.
+//
+
+import Foundation
+
+
+class ReactionsModel: ObservableObject {
+    let state: DamusState
+    let target: String
+    let sub_id: String
+    @Published var reactions: [NostrEvent]
+    
+    init (state: DamusState, target: String) {
+        self.state = state
+        self.target = target
+        self.sub_id = UUID().description
+        self.reactions = []
+    }
+    
+    func get_filter() -> NostrFilter {
+        var filter = NostrFilter.filter_kinds([7])
+        filter.referenced_ids = [target]
+        filter.limit = 500
+        return filter
+    }
+    
+    func subscribe() {
+        let filter = get_filter()
+        let filters = [filter]
+        self.state.pool.subscribe(sub_id: sub_id, filters: filters, handler: handle_nostr_event)
+    }
+    
+    func unsubscribe() {
+        self.state.pool.unsubscribe(sub_id: sub_id)
+    }
+    
+    func handle_event(relay_id: String, ev: NostrEvent) {
+        guard ev.kind == 7 else {
+            return
+        }
+        
+        guard let reacted_to = last_etag(tags: ev.tags) else {
+            return
+        }
+        
+        guard reacted_to == self.target else {
+            return
+        }
+        
+        if insert_uniq_sorted_event(events: &self.reactions, new_ev: ev, cmp: { a, b in a.created_at < b.created_at } ) {
+            objectWillChange.send()
+        }
+    }
+    
+    func handle_nostr_event(relay_id: String, ev: NostrConnectionEvent) {
+        guard case .nostr_event(let nev) = ev else {
+            return
+        }
+        
+        switch nev {
+        case .event(_, let ev):
+            handle_event(relay_id: relay_id, ev: ev)
+            
+        case .notice(_):
+            break
+        case .eose(_):
+            load_profiles(profiles_subid: UUID().description, relay_id: relay_id, events: reactions, damus_state: state)
+            break
+        }
+    }
+}