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import { useMemo } from "react";
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import { useAuthStore } from "@/client/stores/auth-store";
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import { useWorkspaceMembers } from "@/client/stores/workspace-replica";
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import { useActivePageState } from "@/client/components/active-page/use-active-page";
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import { friendlyName } from "@/client/lib/friendly-name";
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import type { ResolveIdentity } from "@/client/lib/presence-identity";
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export interface CollabIdentity {
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  userId: string | null;
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  resolveIdentity: ResolveIdentity;
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}
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/**
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 * Derives collaboration identity for the active page. Returns the signed-in
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 * user's id (null when anonymous / share-token) and a memoized `resolveIdentity`
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 * that maps awareness userId+clientId to a display identity. Workspace members
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 * are the source of truth for names and avatars; share surfaces (where the
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 * viewer isn't a workspace member) fall back to a generated friendlyName.
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 *
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 * Memoization is keyed on the members array so `CanvasSurface`'s depsRef
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 * rebuild-avoidance stays intact — `resolveIdentity` only changes when members
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 * add or remove.
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 */
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export function useCollabIdentity(): CollabIdentity {
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  const userId = useAuthStore((s) => s.user?.id ?? null);
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  const state = useActivePageState();
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  const workspaceId = state.kind === "ready" ? state.snapshot.workspaceId : null;
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  const members = useWorkspaceMembers(workspaceId);
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  const resolveIdentity = useMemo<ResolveIdentity>(() => {
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    const byId = new Map(members.map((m) => [m.user_id, m.user]));
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    return (lookupUserId, clientId) => {
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      const real = lookupUserId ? byId.get(lookupUserId) : undefined;
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      if (real) return { name: real.name, avatar_url: real.avatar_url };
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      return { name: friendlyName(lookupUserId ?? String(clientId)), avatar_url: null };
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    };
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  }, [members]);
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  return { userId, resolveIdentity };
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}