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import { createContext, use } from "react";
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import { useActivePageState } from "@/client/components/active-page/use-active-page";
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import { deriveSharePagePresentation, type ShareRootPage } from "@/client/lib/share-page-model";
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import type { ResolvedViewerContext } from "@/shared/types";
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export type { ShareRootPage };
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export type ShareViewStatus = "loading" | "ready" | "error";
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interface ShareViewBaseState {
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  token: string;
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}
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export interface ShareViewLoadingState extends ShareViewBaseState {
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  status: "loading";
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  error: null;
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}
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export interface ShareViewErrorState extends ShareViewBaseState {
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  status: "error";
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  error: string;
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}
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export interface ShareViewReadyState extends ShareViewBaseState {
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  status: "ready";
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  error: null;
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  workspaceId: string;
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  viewer: ResolvedViewerContext;
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  rootPageId: string;
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  rootPage: ShareRootPage;
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  activePageId: string;
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  navigate: (pageId: string) => void;
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}
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export type ShareViewState = ShareViewLoadingState | ShareViewErrorState | ShareViewReadyState;
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export const ShareViewContext = createContext<ShareViewState | null>(null);
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export function useShareView(): ShareViewState {
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  const ctx = use(ShareViewContext);
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  if (!ctx) throw new Error("useShareView must be used inside ShareViewProvider");
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  return ctx;
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}
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export function useReadyShareView(): ShareViewReadyState {
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  const view = useShareView();
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  if (view.status !== "ready") {
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    throw new Error("useReadyShareView must be used in the ready share branch");
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  }
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  return view;
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}
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export function useSharedPagePresentation() {
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  const share = useReadyShareView();
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  const activePageState = useActivePageState();
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  const presentation = deriveSharePagePresentation(share.rootPage, share.activePageId, activePageState);
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  const isRootActive = presentation.isRootActive;
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  return {
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    ...presentation,
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    ancestors: isRootActive ? [] : presentation.ancestors,
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    isAncestorTrailLoading: isRootActive ? false : presentation.isAncestorTrailLoading,
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    rootPageId: share.rootPageId,
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    rootPage: share.rootPage,
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    workspaceId: share.workspaceId,
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    token: share.token,
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    navigate: share.navigate,
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    unavailableMessage: activePageState.kind === "unavailable" ? activePageState.message : null,
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  };
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}