// @vitest-environment jsdom

import { act, renderHook, waitFor } from "@testing-library/react";
import { renderToString } from "react-dom/server";
import { describe, expect, it, vi } from "vitest";

import {
  type ApplicationResult,
  useApplicationMutation,
} from "../../src/presentation/adapters/query/application-query.ts";
import { createFailure } from "../../src/contracts/errors.ts";
import { MUTATION_COORDINATOR_BOUNDS } from "../../src/contracts/server-state.ts";
import {
  RESOURCE_INVALIDATION_TOPIC,
  queryClient,
  scopeSnapshot,
  wrapper,
} from "./application-query-fixture.tsx";

describe("application mutation reconciliation bridge", () => {
  it.each([
    ["NOT_STARTED", ["existing"], 0, null],
    ["NOT_APPLIED", ["existing"], 0, null],
    ["APPLIED_CONFIRMED", ["existing", "created"], 1, null],
    [
      "MAYBE_APPLIED",
      ["existing", "created"],
      0,
      "mutation-effect-unknown",
    ],
  ] as const)(
    "settles an optimistic failure with %s certainty",
    async (effect, expectedData, expectedInvalidations, expectedIndicator) => {
      const client = queryClient();
      const key = ["resource", `certainty-${effect}`];
      client.setQueryData(key, ["existing"]);
      const invalidateQueries = vi.spyOn(client, "invalidateQueries");
      const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
        effect,
      });
      const hook = renderHook(
        () =>
          useApplicationMutation<string, string>({
            execute: async () => ({ ok: false, error: failure }),
            invalidate: [RESOURCE_INVALIDATION_TOPIC],
            currentData: client.getQueryData(key),
            optimistic: {
              queryKey: key,
              update: (previous, input) => [
                ...(previous as string[]),
                input,
              ],
            },
          }),
        { wrapper: wrapper(client) },
      );

      let outcome: ApplicationResult<string> | undefined;
      await act(async () => {
        outcome = await hook.result.current.submit("created");
      });

      expect(outcome).toMatchObject({
        ok: false,
        error: { kind: failure.kind, effect },
      });
      expect(client.getQueryData(key)).toEqual([...expectedData]);
      expect(invalidateQueries).toHaveBeenCalledTimes(expectedInvalidations);
      expect(hook.result.current.state.indicator).toBe(expectedIndicator);
      if (effect === "MAYBE_APPLIED") {
        expect(outcome).toMatchObject({
          ok: false,
          error: { retryable: false, action: "contact-support" },
        });
        expect(hook.result.current.state.overlay).toMatchObject({
          mutationEffectUnknown: true,
          mutationPending: false,
          mutationConflict: false,
        });
      }
      if (effect === "APPLIED_CONFIRMED") {
        expect(outcome).toMatchObject({
          ok: false,
          error: { retryable: false, action: "none" },
        });
      }
    },
  );

  it("keeps an applied-confirmed layer committed when invalidation fails", async () => {
    const client = queryClient();
    const key = ["resource", "applied-invalidation-failure"];
    client.setQueryData(key, ["base"]);
    const invalidateQueries = vi
      .spyOn(client, "invalidateQueries")
      .mockImplementation(async () => {
        expect(client.getQueryData(key)).toEqual(["base", "created"]);
        throw new Error("refresh failed");
      });
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "APPLIED_CONFIRMED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-applied-invalidation-failure-v1",
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          currentData: client.getQueryData(key),
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    let outcome: ApplicationResult<string> | undefined;
    await act(async () => {
      outcome = await hook.result.current.submit("created");
    });

    expect(outcome).toMatchObject({
      ok: false,
      error: {
        effect: "APPLIED_CONFIRMED",
        retryable: false,
        action: "none",
      },
    });
    expect(invalidateQueries).toHaveBeenCalledOnce();
    expect(client.getQueryData(key)).toEqual(["base", "created"]);
  });

  it("treats a command failure with missing effect certainty as maybe applied", async () => {
    const client = queryClient();
    const key = ["resource", "missing-effect"];
    client.setQueryData(key, ["existing"]);
    const invalidateQueries = vi.spyOn(client, "invalidateQueries");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0);
    const execute = vi.fn(async () => ({ ok: false as const, error: failure }));
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          execute,
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          currentData: client.getQueryData(key),
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    let outcome: ApplicationResult<string> | undefined;
    await act(async () => {
      outcome = await hook.result.current.submit("created");
    });

    expect(execute).toHaveBeenCalledOnce();
    expect(outcome).toMatchObject({
      ok: false,
      error: {
        effect: "MAYBE_APPLIED",
        retryable: false,
        action: "contact-support",
      },
    });
    expect(client.getQueryData(key)).toEqual(["existing", "created"]);
    expect(invalidateQueries).not.toHaveBeenCalled();
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
  });

  it.each([
    ["APPLIED", ["existing", "created"], 1],
    ["NOT_APPLIED", ["existing"], 0],
  ] as const)(
    "reconciles an unknown optimistic effect as %s exactly once",
    async (resolution, expectedData, expectedInvalidations) => {
      const client = queryClient();
      const scope = scopeSnapshot();
      const key = ["resource", `reconcile-${resolution}`];
      client.setQueryData(key, ["existing"]);
      const invalidateQueries = vi.spyOn(client, "invalidateQueries");
      const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
        effect: "MAYBE_APPLIED",
      });
      const hook = renderHook(
        () =>
          useApplicationMutation<string, string>({
            definitionId: `reconcile-${resolution}-v1`,
            definitionVersion: 1,
            operationId: "CREATE",
            requiresIdempotencyKey: true,
            owner: "platform-test",
            duplicatePolicy: "REJECT_WHILE_ACTIVE",
            scope,
            execute: async () => ({ ok: false, error: failure }),
            invalidate: [RESOURCE_INVALIDATION_TOPIC],
            optimistic: {
              queryKey: key,
              update: (previous, input) => [
                ...(previous as string[]),
                input,
              ],
            },
          }),
        { wrapper: wrapper(client) },
      );

      await act(() => hook.result.current.submit("created"));
      expect(hook.result.current.state.indicator).toBe(
        "mutation-effect-unknown",
      );

      await act(() => hook.result.current.reconcileUnknownEffect(resolution));
      await act(() =>
        hook.result.current.reconcileUnknownEffect(
          resolution === "APPLIED" ? "NOT_APPLIED" : "APPLIED",
        ),
      );

      expect(client.getQueryData(key)).toEqual([...expectedData]);
      expect(invalidateQueries).toHaveBeenCalledTimes(expectedInvalidations);
      expect(hook.result.current.state.indicator).toBeNull();
    },
  );

  it("reconciles parallel unknown effects without losing either lease", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const key = ["resource", "parallel-unknown"];
    client.setQueryData(key, ["base"]);
    const invalidateQueries = vi.spyOn(client, "invalidateQueries");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const resolvers: Array<(value: ApplicationResult<string>) => void> = [];
    const execute = vi.fn(
      (_input: string) =>
        new Promise<ApplicationResult<string>>((resolve) => {
          resolvers.push(resolve);
        }),
    );
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "parallel-unknown-v1",
          definitionVersion: 1,
          operationId: "CREATE",
          requiresIdempotencyKey: true,
          owner: "platform-test",
          duplicatePolicy: "ALLOW_PARALLEL",
          scope,
          execute,
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    let first: Promise<ApplicationResult<string>> | undefined;
    let second: Promise<ApplicationResult<string>> | undefined;
    act(() => {
      first = hook.result.current.submit("created");
      second = hook.result.current.submit("created");
    });
    await waitFor(() => expect(resolvers).toHaveLength(2));
    act(() => resolvers[0]?.({ ok: false, error: failure }));
    if (!first) throw new Error("expected first mutation");
    await act(() => first);
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    act(() => resolvers[1]?.({ ok: false, error: failure }));
    if (!second) throw new Error("expected second mutation");
    await act(() => second);

    expect(client.getQueryData(key)).toEqual(["base", "created", "created"]);
    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(client.getQueryData(key)).toEqual(["base", "created"]);
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );

    await act(() => hook.result.current.reconcileUnknownEffect("APPLIED"));
    expect(client.getQueryData(key)).toEqual(["base", "created"]);
    expect(invalidateQueries).toHaveBeenCalledOnce();
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("closes an unknown optimistic effect safely after scope expiry", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const key = ["resource", "expired-unknown"];
    client.setQueryData(key, ["existing"]);
    const invalidateQueries = vi.spyOn(client, "invalidateQueries");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "expired-unknown-v1",
          definitionVersion: 1,
          operationId: "CREATE",
          requiresIdempotencyKey: true,
          owner: "platform-test",
          duplicatePolicy: "REJECT_WHILE_ACTIVE",
          scope,
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    await act(() => hook.result.current.submit("created"));
    scope.fence();
    await act(() => hook.result.current.reconcileUnknownEffect("APPLIED"));

    expect(client.getQueryState(key)).toBeUndefined();
    expect(invalidateQueries).not.toHaveBeenCalled();
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("reconciles a legacy unknown effect without an optimistic layer", async () => {
    const client = queryClient();
    const invalidateQueries = vi.spyOn(client, "invalidateQueries");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-no-layer-reconcile-v1",
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
        }),
      { wrapper: wrapper(client) },
    );

    await act(() => hook.result.current.submit("created"));
    expect(invalidateQueries).not.toHaveBeenCalled();

    await act(() => hook.result.current.reconcileUnknownEffect("APPLIED"));
    expect(invalidateQueries).toHaveBeenCalledOnce();
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("preserves a later legacy commit when an earlier unknown effect is not applied", async () => {
    const client = queryClient();
    const key = ["resource", "legacy-ordered-unknown"];
    client.setQueryData(key, ["base"]);
    const uncertainFailure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const resolvers = new Map<
      string,
      (value: ApplicationResult<string>) => void
    >();
    const execute = vi.fn(
      (input: string) =>
        new Promise<ApplicationResult<string>>((resolve) => {
          resolvers.set(input, resolve);
        }),
    );
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-active-after-unknown-v1",
          duplicatePolicy: "ALLOW_PARALLEL",
          execute,
          currentData: client.getQueryData(key),
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    let first: Promise<ApplicationResult<string>> | undefined;
    let second: Promise<ApplicationResult<string>> | undefined;
    act(() => {
      first = hook.result.current.submit("first");
      second = hook.result.current.submit("second");
    });
    await waitFor(() => expect(resolvers.size).toBe(2));
    act(() =>
      resolvers.get("first")?.({ ok: false, error: uncertainFailure }),
    );
    if (!first) throw new Error("expected first mutation");
    await act(() => first);
    act(() =>
      resolvers.get("second")?.({ ok: true, value: "second" }),
    );
    if (!second) throw new Error("expected second mutation");
    await act(() => second);

    expect(client.getQueryData(key)).toEqual(["base", "first", "second"]);
    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(client.getQueryData(key)).toEqual(["base", "second"]);
  });

  it("keeps a newer submit pending while reconciling an older unknown effect", async () => {
    const client = queryClient();
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    let completeSecond: (value: ApplicationResult<string>) => void = () => {};
    const execute = vi.fn((input: string) =>
      input === "first"
        ? Promise.resolve({ ok: false as const, error: failure })
        : new Promise<ApplicationResult<string>>((resolve) => {
            completeSecond = resolve;
          }),
    );
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-active-after-unknown-no-layer-v1",
          duplicatePolicy: "ALLOW_PARALLEL",
          execute,
        }),
      { wrapper: wrapper(client) },
    );

    await act(() => hook.result.current.submit("first"));
    let second: Promise<ApplicationResult<string>> | undefined;
    act(() => {
      second = hook.result.current.submit("second");
    });
    await waitFor(() => expect(execute).toHaveBeenCalledTimes(2));
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );

    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(hook.result.current.state.indicator).toBe("mutation-pending");

    completeSecond({ ok: true, value: "second" });
    if (!second) throw new Error("expected second mutation");
    await act(() => second);
    await waitFor(() => expect(hook.result.current.state.indicator).toBeNull());
  });

  it("serializes reconciliation so a double action cannot settle the next intent", async () => {
    const client = queryClient();
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    let finishInvalidation: () => void = () => {};
    const invalidation = new Promise<void>((resolve) => {
      finishInvalidation = resolve;
    });
    vi.spyOn(client, "invalidateQueries").mockImplementation(
      async () => invalidation,
    );
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-applied-double-action-v1",
          duplicatePolicy: "ALLOW_PARALLEL",
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
        }),
      { wrapper: wrapper(client) },
    );

    await act(async () => {
      await Promise.all([
        hook.result.current.submit("first"),
        hook.result.current.submit("second"),
      ]);
    });

    let firstResolution: Promise<void> | undefined;
    let duplicateResolution: Promise<void> | undefined;
    act(() => {
      firstResolution = hook.result.current.reconcileUnknownEffect("APPLIED");
      duplicateResolution = hook.result.current.reconcileUnknownEffect(
        "NOT_APPLIED",
      );
    });
    await expect(duplicateResolution).resolves.toBeUndefined();
    expect(hook.result.current.state.indicator).toBe("mutation-pending");

    finishInvalidation();
    if (!firstResolution) throw new Error("expected reconciliation");
    await act(() => firstResolution);
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("keeps the next intent unresolved after a synchronous not-applied double action", async () => {
    const client = queryClient();
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-not-applied-double-action-v1",
          duplicatePolicy: "ALLOW_PARALLEL",
          execute: async () => ({ ok: false, error: failure }),
        }),
      { wrapper: wrapper(client) },
    );

    await act(async () => {
      await Promise.all([
        hook.result.current.submit("first"),
        hook.result.current.submit("second"),
      ]);
    });

    let firstResolution: Promise<void> | undefined;
    let duplicateResolution: Promise<void> | undefined;
    act(() => {
      firstResolution = hook.result.current.reconcileUnknownEffect(
        "NOT_APPLIED",
      );
      duplicateResolution = hook.result.current.reconcileUnknownEffect(
        "APPLIED",
      );
    });
    await expect(duplicateResolution).resolves.toBeUndefined();
    if (!firstResolution) throw new Error("expected reconciliation");
    await act(() => firstResolution);

    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("clears every stale-scope unknown effect without touching new data", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const key = ["resource", "scope-unknown-queue"];
    client.setQueryData(key, ["base"]);
    const invalidateQueries = vi.spyOn(client, "invalidateQueries");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "scope-unknown-queue-v1",
          definitionVersion: 1,
          operationId: "CREATE",
          requiresIdempotencyKey: true,
          owner: "platform-test",
          duplicatePolicy: "ALLOW_PARALLEL",
          scope,
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    await act(async () => {
      await Promise.all([
        hook.result.current.submit("created"),
        hook.result.current.submit("created"),
      ]);
    });
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );

    act(() => scope.fence());
    await waitFor(() => expect(hook.result.current.state.indicator).toBeNull());
    expect(client.getQueryState(key)).toBeUndefined();
    client.setQueryData(key, ["new-generation"]);
    await act(() => hook.result.current.reconcileUnknownEffect("APPLIED"));

    expect(client.getQueryData(key)).toEqual(["new-generation"]);
    expect(invalidateQueries).not.toHaveBeenCalled();
  });

  it("restores a bound unknown-effect head after controller remount", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const key = ["resource", "durable-unknown"];
    client.setQueryData(key, ["base"]);
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const mutationOptions = {
      definitionId: "durable-unknown-v1",
      definitionVersion: 1,
      operationId: "CREATE",
      requiresIdempotencyKey: true,
      owner: "platform-test",
      duplicatePolicy: "REJECT_WHILE_ACTIVE" as const,
      scope,
      execute: vi.fn(async () => ({ ok: false as const, error: failure })),
      invalidate: [] as const,
      optimistic: {
        queryKey: key,
        update: (previous: unknown, input: string) => [
          ...(previous as string[]),
          input,
        ],
      },
    };
    const first = renderHook(
      () => useApplicationMutation<string, string>(mutationOptions),
      { wrapper: wrapper(client) },
    );

    await act(() => first.result.current.submit("created"));
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    first.unmount();

    const remounted = renderHook(
      () => useApplicationMutation<string, string>(mutationOptions),
      { wrapper: wrapper(client) },
    );
    expect(remounted.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    await act(() =>
      remounted.result.current.reconcileUnknownEffect("NOT_APPLIED"),
    );

    expect(client.getQueryData(key)).toEqual(["base"]);
    expect(remounted.result.current.state.indicator).toBeNull();
    expect(mutationOptions.execute).toHaveBeenCalledOnce();
  });

  it("restores a non-optimistic legacy unknown effect by stable definition after remount", async () => {
    const client = queryClient();
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const mutationOptions = {
      definitionId: "legacy-durable-create-v1",
      execute: vi.fn(async () => ({ ok: false as const, error: failure })),
    };
    const first = renderHook(
      () => useApplicationMutation<string, string>(mutationOptions),
      { wrapper: wrapper(client) },
    );

    await act(() => first.result.current.submit("created"));
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    first.unmount();

    const remounted = renderHook(
      () => useApplicationMutation<string, string>(mutationOptions),
      { wrapper: wrapper(client) },
    );
    expect(remounted.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    await act(() =>
      remounted.result.current.reconcileUnknownEffect("NOT_APPLIED"),
    );

    expect(remounted.result.current.state.indicator).toBeNull();
    expect(mutationOptions.execute).toHaveBeenCalledOnce();
  });

  it("does not allocate unknown-effect channels for abandoned server renders", async () => {
    const client = queryClient();
    const selectedScopes = Array.from(
      { length: MUTATION_COORDINATOR_BOUNDS.activeDefinitionsPerRuntime },
      (_, index) => scopeSnapshot(1, `server-render-scope-${index}`),
    );

    function AbandonedMutation({ index }: Readonly<{ index: number }>) {
      useApplicationMutation<string, string>({
        definitionId: `server-render-abandoned-${index}`,
        definitionVersion: 1,
        operationId: "CREATE",
        requiresIdempotencyKey: true,
        owner: "platform-test",
        duplicatePolicy: "REJECT_WHILE_ACTIVE",
        scope: selectedScopes[index]!,
        execute: async (input) => ({ ok: true, value: input }),
        invalidate: [],
      });
      return null;
    }

    const ServerWrapper = wrapper(client);
    renderToString(
      <ServerWrapper>
        {selectedScopes.map((_, index) => (
          <AbandonedMutation key={index} index={index} />
        ))}
      </ServerWrapper>,
    );

    const scope = scopeSnapshot(1, "committed-after-server-render");
    const execute = vi.fn(async (input: string) => ({
      ok: true as const,
      value: input,
    }));
    const committed = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "committed-after-server-render",
          definitionVersion: 1,
          operationId: "CREATE",
          requiresIdempotencyKey: true,
          owner: "platform-test",
          duplicatePolicy: "REJECT_WHILE_ACTIVE",
          scope,
          execute,
          invalidate: [],
        }),
      { wrapper: wrapper(client) },
    );

    await expect(committed.result.current.submit("created")).resolves.toEqual({
      ok: true,
      value: "created",
    });
    expect(execute).toHaveBeenCalledOnce();
  });

  it("isolates channels when a reused fingerprint advances generation", async () => {
    const client = queryClient();
    const firstScope = scopeSnapshot(1, "reused-scope-fingerprint");
    const secondScope = scopeSnapshot(2, "reused-scope-fingerprint");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const definition = {
      definitionId: "generation-channel-v1",
      definitionVersion: 1,
      operationId: "CREATE",
      requiresIdempotencyKey: true,
      owner: "platform-test",
      duplicatePolicy: "REJECT_WHILE_ACTIVE" as const,
      invalidate: [] as const,
    };
    const first = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: firstScope,
          execute: async () => ({ ok: false, error: failure }),
        }),
      { wrapper: wrapper(client) },
    );
    await act(() => first.result.current.submit("first"));
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );

    const secondExecute = vi.fn(async () => ({
      ok: true as const,
      value: "second",
    }));
    const second = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: secondScope,
          execute: secondExecute,
        }),
      { wrapper: wrapper(client) },
    );

    expect(second.result.current.state.indicator).toBeNull();
    await expect(second.result.current.submit("second")).resolves.toEqual({
      ok: true,
      value: "second",
    });
    expect(secondExecute).toHaveBeenCalledOnce();
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
  });

  it("isolates unrelated non-optimistic legacy controllers", async () => {
    const client = queryClient();
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const first = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-isolation-first-v1",
          execute: async () => ({ ok: false, error: failure }),
        }),
      { wrapper: wrapper(client) },
    );
    const second = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "legacy-isolation-second-v1",
          execute: async (input) => ({ ok: true, value: input }),
        }),
      { wrapper: wrapper(client) },
    );

    await act(() => first.result.current.submit("first"));
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    expect(second.result.current.state.indicator).toBeNull();
    await act(() => second.result.current.reconcileUnknownEffect("APPLIED"));
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
  });

  it("fails closed when identical bound metadata is mounted with a different scope owner", async () => {
    const client = queryClient();
    const firstScope = scopeSnapshot(1, "same-owner-fingerprint");
    const secondScope = scopeSnapshot(1, "same-owner-fingerprint");
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const definition = {
      definitionId: "scope-owner-channel-v1",
      definitionVersion: 1,
      operationId: "CREATE",
      requiresIdempotencyKey: true,
      owner: "platform-test",
      duplicatePolicy: "REJECT_WHILE_ACTIVE" as const,
      invalidate: [] as const,
    };
    const first = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: firstScope,
          execute: async () => ({ ok: false, error: failure }),
        }),
      { wrapper: wrapper(client) },
    );
    await act(() => first.result.current.submit("first"));

    const secondExecute = vi.fn(async () => ({
      ok: true as const,
      value: "second",
    }));
    const second = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: secondScope,
          execute: secondExecute,
        }),
      { wrapper: wrapper(client) },
    );

    expect(second.result.current.state.indicator).toBeNull();
    await expect(second.result.current.submit("second")).resolves.toMatchObject({
      ok: false,
      error: {
        kind: "IDENTITY_INTERN_LIMIT_EXCEEDED",
        code: "UNKNOWN_EFFECT_CHANNEL_LIMIT_EXCEEDED",
        effect: "NOT_STARTED",
      },
    });
    expect(secondExecute).not.toHaveBeenCalled();
    expect(first.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
  });

  it("releases empty unmounted channels after their active mutation settles", async () => {
    const client = queryClient();
    const firstScope = scopeSnapshot(1, "release-owner-fingerprint");
    const secondScope = scopeSnapshot(1, "release-owner-fingerprint");
    let resolveFirst: (value: ApplicationResult<string>) => void = () => {};
    const definition = {
      definitionId: "release-channel-v1",
      definitionVersion: 1,
      operationId: "CREATE",
      requiresIdempotencyKey: true,
      owner: "platform-test",
      duplicatePolicy: "ALLOW_PARALLEL" as const,
      invalidate: [] as const,
    };
    const first = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: firstScope,
          execute: () =>
            new Promise((resolve) => {
              resolveFirst = resolve;
            }),
        }),
      { wrapper: wrapper(client) },
    );
    let pending: Promise<ApplicationResult<string>> | undefined;
    act(() => {
      pending = first.result.current.submit("created");
    });
    await waitFor(() =>
      expect(first.result.current.state.indicator).toBe("mutation-pending"),
    );
    first.unmount();
    resolveFirst({ ok: true, value: "created" });
    if (!pending) throw new Error("expected active mutation");
    await act(() => pending);

    const execute = vi.fn(async () => ({
      ok: true as const,
      value: "after-release",
    }));
    const afterRelease = renderHook(
      () =>
        useApplicationMutation<string, string>({
          ...definition,
          scope: secondScope,
          execute,
        }),
      { wrapper: wrapper(client) },
    );

    await expect(afterRelease.result.current.submit("created")).resolves.toEqual({
      ok: true,
      value: "after-release",
    });
    expect(execute).toHaveBeenCalledOnce();
  });

  it("enforces the active intent bound across all QueryClient channels", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const never = () => new Promise<ApplicationResult<string>>(() => {});
    const options = (definitionId: string) => ({
      definitionId,
      definitionVersion: 1,
      operationId: "CREATE",
      requiresIdempotencyKey: true,
      owner: "platform-test",
      duplicatePolicy: "ALLOW_PARALLEL" as const,
      scope,
      execute: never,
      invalidate: [] as const,
    });
    const first = renderHook(
      () => useApplicationMutation<string, string>(options("bound-a")),
      { wrapper: wrapper(client) },
    );
    const second = renderHook(
      () => useApplicationMutation<string, string>(options("bound-b")),
      { wrapper: wrapper(client) },
    );
    const half = MUTATION_COORDINATOR_BOUNDS.activeIntentsTotal / 2;

    act(() => {
      for (let index = 0; index < half; index += 1) {
        void first.result.current.submit("same-input");
        void second.result.current.submit("same-input");
      }
    });

    await expect(first.result.current.submit("same-input")).resolves.toMatchObject({
      ok: false,
      error: {
        kind: "IDENTITY_INTERN_LIMIT_EXCEEDED",
        code: "UNKNOWN_EFFECT_CHANNEL_LIMIT_EXCEEDED",
        effect: "NOT_STARTED",
      },
    });
    act(() => scope.fence());
  });

  it("reconciles parallel unknown effects in submit order after reverse completion", async () => {
    const client = queryClient();
    const key = ["resource", "reverse-completion"];
    client.setQueryData(key, ["base"]);
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const resolvers = new Map<
      string,
      (value: ApplicationResult<string>) => void
    >();
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          duplicatePolicy: "ALLOW_PARALLEL",
          execute: (input) =>
            new Promise((resolve) => {
              resolvers.set(input, resolve);
            }),
          currentData: client.getQueryData(key),
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    let first: Promise<ApplicationResult<string>> | undefined;
    let second: Promise<ApplicationResult<string>> | undefined;
    act(() => {
      first = hook.result.current.submit("first");
      second = hook.result.current.submit("second");
    });
    await waitFor(() => expect(resolvers.size).toBe(2));
    act(() => resolvers.get("second")?.({ ok: false, error: failure }));
    if (!second) throw new Error("expected second mutation");
    await act(() => second);
    expect(hook.result.current.state.indicator).toBe("mutation-pending");

    act(() => resolvers.get("first")?.({ ok: false, error: failure }));
    if (!first) throw new Error("expected first mutation");
    await act(() => first);
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );

    await act(() => hook.result.current.reconcileUnknownEffect("NOT_APPLIED"));
    expect(client.getQueryData(key)).toEqual(["base", "second"]);
    expect(hook.result.current.state.indicator).toBe(
      "mutation-effect-unknown",
    );
    await act(() => hook.result.current.reconcileUnknownEffect("APPLIED"));
    expect(client.getQueryData(key)).toEqual(["base", "second"]);
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it("removes committed old-scope data when scope fences during reconciliation invalidation", async () => {
    const client = queryClient();
    const scope = scopeSnapshot();
    const key = ["resource", "reconcile-fence-race"];
    client.setQueryData(key, ["base"]);
    let finishInvalidation: () => void = () => {};
    const invalidation = new Promise<void>((resolve) => {
      finishInvalidation = resolve;
    });
    const invalidateQueries = vi
      .spyOn(client, "invalidateQueries")
      .mockImplementation(async () => invalidation);
    const failure = createFailure("SERVER_FAILURE", "CREATE", 0, {
      effect: "MAYBE_APPLIED",
    });
    const hook = renderHook(
      () =>
        useApplicationMutation<string, string>({
          definitionId: "reconcile-fence-race-v1",
          definitionVersion: 1,
          operationId: "CREATE",
          requiresIdempotencyKey: true,
          owner: "platform-test",
          duplicatePolicy: "REJECT_WHILE_ACTIVE",
          scope,
          execute: async () => ({ ok: false, error: failure }),
          invalidate: [RESOURCE_INVALIDATION_TOPIC],
          optimistic: {
            queryKey: key,
            update: (previous, input) => [
              ...(previous as string[]),
              input,
            ],
          },
        }),
      { wrapper: wrapper(client) },
    );

    await act(() => hook.result.current.submit("created"));
    let reconciliation: Promise<void> | undefined;
    act(() => {
      reconciliation = hook.result.current.reconcileUnknownEffect("APPLIED");
    });
    await waitFor(() => expect(invalidateQueries).toHaveBeenCalledOnce());
    act(() => scope.fence());
    finishInvalidation();
    if (!reconciliation) throw new Error("expected reconciliation");
    await act(() => reconciliation);

    expect(client.getQueryState(key)).toBeUndefined();
    expect(hook.result.current.state.indicator).toBeNull();
  });

  it.each(["NOT_APPLICABLE", undefined] as const)(
    "treats %s conflict effect certainty as unknown without conflict retry",
    async (effect) => {
      const client = queryClient();
      const key = ["resource", `ambiguous-conflict-${String(effect)}`];
      client.setQueryData(key, ["base"]);
      const conflict = createFailure("CONFLICT", "CREATE", 0, {
        ...(effect ? { effect } : {}),
      });
      const hook = renderHook(
        () =>
          useApplicationMutation<string, string>({
            execute: async () => ({ ok: false, error: conflict }),
            currentData: client.getQueryData(key),
            optimistic: {
              queryKey: key,
              update: (previous, input) => [
                ...(previous as string[]),
                input,
              ],
            },
          }),
        { wrapper: wrapper(client) },
      );

      let outcome: ApplicationResult<string> | undefined;
      await act(async () => {
        outcome = await hook.result.current.submit("created");
      });

      expect(outcome).toMatchObject({
        ok: false,
        error: {
          effect: "MAYBE_APPLIED",
          retryable: false,
          action: "contact-support",
        },
      });
      expect(client.getQueryData(key)).toEqual(["base", "created"]);
      expect(hook.result.current.state.indicator).toBe(
        "mutation-effect-unknown",
      );
    },
  );

});