Move domain stuff to sub directory, clean up base classes

packages/domain/src/kinds/PollResponse.ts

@@ -0,0 +1,62 @@
+import {uniq, first} from "@welshman/lib"
+import {POLL_RESPONSE, getTagValue, getTagValues} from "@welshman/util"
+import {EventReader} from "../EventReader.js"
+import {EventBuilder} from "../EventBuilder.js"
+
+// NIP-88 kind-1018 poll vote. Empty content; the target poll is referenced via
+// an "e" tag and each chosen option id lives in its own "response" tag. Tags-only
+// content, so it extends EventReader/EventBuilder directly.
+export class PollResponse extends EventReader {
+  readonly kind = POLL_RESPONSE
+
+  pollId() {
+    return getTagValue("e", this.event.tags) || ""
+  }
+
+  selections() {
+    return uniq(getTagValues("response", this.event.tags))
+  }
+
+  builder() {
+    return new PollResponseBuilder(this)
+  }
+}
+
+export class PollResponseBuilder extends EventBuilder<PollResponse> {
+  readonly kind = POLL_RESPONSE
+
+  pollId = ""
+  selections: string[] = []
+
+  constructor(readonly reader?: PollResponse) {
+    super(reader)
+
+    // Consume the represented tags out of the carried-over extraTags so they
+    // round-trip through the structured fields below rather than being emitted
+    // twice (once from buildTags, once from the base's extraTags pass-through).
+    this.pollId = first(this.consumeTags("e"))?.[1] ?? ""
+    this.selections = uniq(this.consumeTags("response").map(t => t[1]))
+  }
+
+  setPollId(pollId: string) {
+    this.pollId = pollId
+
+    return this
+  }
+
+  addSelection(id: string) {
+    this.selections = uniq([...this.selections, id])
+
+    return this
+  }
+
+  protected validate() {
+    if (!this.pollId) {
+      throw new Error("PollResponse requires a pollId")
+    }
+  }
+
+  protected buildTags() {
+    return [["e", this.pollId], ...this.selections.map(id => ["response", id])]
+  }
+}