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import { describe, expect, it } from "vitest";
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import { deriveSharePagePresentation } from "@/client/lib/share-page-model";
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import type { ActivePageState } from "@/client/lib/active-page-model";
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import type { ShareRootPage } from "@/client/components/share/use-share-view";
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const ROOT_PAGE: ShareRootPage = {
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  id: "page-root",
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  kind: "doc",
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  title: "Root",
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  icon: "📄",
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  cover_url: "/uploads/root-cover",
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  permission: "view",
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};
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describe("deriveSharePagePresentation", () => {
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  it("uses the ready page when the active page is loaded", () => {
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    const state: ActivePageState = {
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      kind: "ready",
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      backing: "live",
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      snapshot: { id: "page-child", workspaceId: "ws-1", kind: "doc", title: "Child", icon: "🌿", coverUrl: null },
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      access: { mode: "edit" },
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      ancestors: [],
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      ancestorsStatus: "ready",
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    };
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    expect(deriveSharePagePresentation(ROOT_PAGE, "page-child", state)).toMatchObject({
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      activePageId: "page-child",
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      isRootActive: false,
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      isPageLoading: false,
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      isAncestorTrailLoading: false,
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      displayTitle: "Child",
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      displayIcon: "🌿",
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      isViewOnly: false,
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    });
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  });
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  it("does not synthesize root metadata when the active page state is still loading", () => {
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    // Boundary remount + useState(initialSnapshot) makes this transient state
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    // unreachable for the root page in practice, but the derivation must not
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    // paper over loading with stale rootPage fallbacks — display stays empty.
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    const state: ActivePageState = { kind: "loading" };
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    expect(deriveSharePagePresentation(ROOT_PAGE, "page-root", state)).toMatchObject({
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      activePageId: "page-root",
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      isRootActive: true,
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      isPageLoading: true,
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      isAncestorTrailLoading: false,
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      displayTitle: "",
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      displayIcon: null,
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      displayCoverUrl: null,
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      isViewOnly: true,
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    });
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  });
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  it("does not leak stale ready data from a previous page id", () => {
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    const state: ActivePageState = {
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      kind: "ready",
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      backing: "live",
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      snapshot: { id: "page-old", workspaceId: "ws-1", kind: "doc", title: "Old", icon: null, coverUrl: null },
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      access: { mode: "view" },
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      ancestors: [],
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      ancestorsStatus: "ready",
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    };
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    expect(deriveSharePagePresentation(ROOT_PAGE, "page-next", state)).toMatchObject({
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      activePageId: "page-next",
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      isRootActive: false,
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      isPageLoading: true,
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      isAncestorTrailLoading: false,
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      page: null,
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      displayTitle: "",
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      displayIcon: null,
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      isViewOnly: true,
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    });
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  });
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  it("surfaces ancestor trail loading separately from page readiness", () => {
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    const state: ActivePageState = {
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      kind: "ready",
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      backing: "live",
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      snapshot: { id: "page-child", workspaceId: "ws-1", kind: "doc", title: "Child", icon: null, coverUrl: null },
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      access: { mode: "view" },
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      ancestors: [],
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      ancestorsStatus: "loading",
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    };
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    expect(deriveSharePagePresentation(ROOT_PAGE, "page-child", state)).toMatchObject({
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      activePageId: "page-child",
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      isPageLoading: false,
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      isAncestorTrailLoading: true,
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      page: { id: "page-child" },
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    });
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  });
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});