Revert "Simplifying reactions"

This reverts commit 3834c6b.

see nostrability/nostrability#48

Author: fiatjaf

25.md

@@ -25,24 +25,23 @@ consider it a "+".
 Tags
 ----
 
-The reaction event SHOULD include `a`, `e` and `p` tags pointing to the note the user is
-reacting to. The `p` tag allows authors to be notified. The `e` tags enables clients 
-to pull all the reactions to individual events and `a` tags enables clients to seek reactions
-for all versions of a replaceable event. 
+The reaction event SHOULD include `e` and `p` tags from the note the user is reacting to (and optionally `a` tags if the target is a replaceable event). This allows users to be notified of reactions to posts they were mentioned in. Including the `e` tags enables clients to pull all the reactions associated with individual posts or all the posts in a thread. `a` tags enables clients to seek reactions for all versions of a replaceable event.
 
-The `e` tag MUST be the `id` of the note that is being reacted to. 
+The last `e` tag MUST be the `id` of the note that is being reacted to.
 
-The `a` tag MUST contain the coordinates (`kind:pubkey:d-tag`) of the replaceable being reacted to. 
+The last `p` tag MUST be the `pubkey` of the event being reacted to.
 
-The `p` tag MUST be the `pubkey` of the event being reacted to.
+The `a` tag MUST contain the coordinates (`kind:pubkey:d-tag`) of the replaceable being reacted to.
 
-The reaction event MAY include a `k` tag with the stringified kind number
-of the reacted event as its value.
+The reaction event MAY include a `k` tag with the stringified kind number of the reacted event as its value.
 
 Example code
 
 ```swift
 func make_like_event(pubkey: String, privkey: String, liked: NostrEvent) -> NostrEvent {
+    var tags: [[String]] = liked.tags.filter {
+    	tag in tag.count >= 2 && (tag[0] == "e" || tag[0] == "p")
+    }
     tags.append(["e", liked.id])
     tags.append(["p", liked.pubkey])
     tags.append(["k", liked.kind])