import { beforeEach, describe, expect, it, vi } from "vitest";
import {
  cleanupOwnedProcessGroup,
  type ProcessOwnershipHost,
} from "./ProcessOwnership.js";
import {
  observeOwnedProcessGroups,
  observeOwnedProcessLineage,
} from "./ProcessOwnershipObservation.js";
import { createOwnership, host } from "./ProcessOwnership.fixture.js";
import { ProcessOwnershipEvidenceOwner } from "./ProcessOwnershipEvidence.js";

let ownership = createOwnership();
beforeEach(() => {
  ownership = createOwnership();
});

const processes = [100, 101].map((pid) => ({
  pid,
  parentPid: pid === 100 ? 1 : 100,
  processGroupId: 100,
  state: "S",
  command: "fixture",
}));

it("uses native same-generation group relations instead of stale table groups", async () => {
  const rows = [
    { ...processes[0]!, processGroupId: 200 },
    { ...processes[1]!, pid: 200, parentPid: 1, processGroupId: 100 },
  ];
  const host: ProcessOwnershipHost = {
    listProcesses: () => Promise.resolve(rows),
    environment: () => Promise.resolve({}),
    runTokens: (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            { state: "readable" as const, runId: ownership.runId },
          ]),
        ),
      ),
    processIdentities: (members) =>
      Promise.resolve(
        new Map(
          members.map((member) => [
            member.pid,
            {
              state: "readable" as const,
              identity: `start-${String(member.pid)}`,
              relation: {
                state: "observed" as const,
                parentPid: member.pid === 100 ? 1 : 100,
                processGroupId: member.pid === 100 ? 100 : 200,
              },
            },
          ]),
        ),
      ),
    signalGroup: vi.fn(),
  };

  await expect(
    observeOwnedProcessGroups(ownership.runId, [100, 200], host),
  ).resolves.toEqual(
    new Map([
      [100, { state: "alive" }],
      [200, { state: "alive" }],
    ]),
  );
});

it("does not report a native zombie as a live owned group member", async () => {
  const row = processes[0]!;
  const host: ProcessOwnershipHost = {
    listProcesses: () => Promise.resolve([row]),
    environment: () => Promise.resolve({ REA_PROCESS_RUN_ID: ownership.runId }),
    runTokens: (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            { state: "readable" as const, runId: ownership.runId },
          ]),
        ),
      ),
    processIdentities: (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            {
              state: "readable" as const,
              identity: `start-${String(pid)}`,
              lifecycle: {
                state: "observed" as const,
                lifecycle: "zombie" as const,
              },
              relation: {
                state: "observed" as const,
                parentPid: 1,
                processGroupId: 100,
              },
            },
          ]),
        ),
      ),
    signalGroup: vi.fn(),
  };

  await expect(
    observeOwnedProcessGroups(ownership.runId, [100], host),
  ).resolves.toEqual(new Map([[100, { state: "empty" }]]));
});

it("observes multiple groups from one process snapshot and token batch", async () => {
  const rows = [
    ...processes,
    {
      pid: 200,
      parentPid: 1,
      processGroupId: 200,
      state: "S",
      command: "other-owned-group",
    },
    {
      pid: 300,
      parentPid: 1,
      processGroupId: 300,
      state: "Z",
      command: "[exited]",
    },
  ];
  const listProcesses = vi.fn(() => Promise.resolve(rows));
  const environment = vi.fn(() => Promise.resolve({}));
  const runTokens = vi.fn<NonNullable<ProcessOwnershipHost["runTokens"]>>(
    (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            {
              state: "readable" as const,
              runId: pid === 200 ? "other-run" : ownership.runId,
            },
          ]),
        ),
      ),
  );

  await expect(
    observeOwnedProcessGroups(ownership.runId, [100, 200, 300], {
      listProcesses,
      environment,
      runTokens,
      signalGroup: vi.fn(),
    }),
  ).resolves.toEqual(
    new Map([
      [100, { state: "alive" }],
      [
        200,
        { state: "unverifiable", reason: "process ownership did not match" },
      ],
      [300, { state: "empty" }],
    ]),
  );
  expect(listProcesses).toHaveBeenCalledTimes(1);
  expect(runTokens).toHaveBeenCalledTimes(1);
  expect(runTokens).toHaveBeenCalledWith(
    rows.filter(({ state }) => state !== "Z"),
  );
  expect(environment).not.toHaveBeenCalled();
});

it("rechecks unavailable members individually before classifying their groups", async () => {
  const rows = [
    ...processes,
    {
      pid: 200,
      parentPid: 1,
      processGroupId: 200,
      state: "S",
      command: "unreadable-group",
    },
  ];
  const listProcesses = vi
    .fn<ProcessOwnershipHost["listProcesses"]>()
    .mockResolvedValueOnce(rows)
    .mockResolvedValueOnce(rows.filter(({ pid }) => pid !== 101))
    .mockResolvedValueOnce(rows);
  const runTokens = vi.fn<NonNullable<ProcessOwnershipHost["runTokens"]>>(
    (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            pid === 101 || pid === 200
              ? {
                  state: "unavailable" as const,
                  reason: `unreadable-${String(pid)}`,
                }
              : { state: "readable" as const, runId: ownership.runId },
          ]),
        ),
      ),
  );

  await expect(
    observeOwnedProcessGroups(ownership.runId, [100, 200], {
      listProcesses,
      environment: vi.fn(() => Promise.resolve({})),
      runTokens,
      signalGroup: vi.fn(),
    }),
  ).resolves.toEqual(
    new Map([
      [100, { state: "alive" }],
      [
        200,
        {
          state: "unverifiable",
          reason:
            "process ownership could not be revalidated for PID 200: unreadable-200",
        },
      ],
    ]),
  );
  expect(listProcesses).toHaveBeenCalledTimes(3);
  expect(runTokens).toHaveBeenCalledTimes(1);
});

describe("multi-group ownership observation cancellation", () => {
  it("cancels an unavailable-token liveness recheck before the host releases it", async () => {
    const controller = new AbortController();
    const reason = new Error("cancel process liveness recheck");
    const rows = [processes[0]!];
    let listCalls = 0;
    let releaseSecondList: (() => void) | undefined;
    let signalAtSecondList: AbortSignal | undefined;
    let announceSecondList: (() => void) | undefined;
    const secondListStarted = new Promise<void>((resolve) => {
      announceSecondList = resolve;
    });
    const listProcesses = vi.fn<ProcessOwnershipHost["listProcesses"]>(
      (signal) => {
        listCalls += 1;
        if (listCalls === 1) return Promise.resolve(rows);
        signalAtSecondList = signal;
        announceSecondList?.();
        return new Promise((resolve, reject) => {
          releaseSecondList = () => resolve(rows);
          if (signal === undefined) return;
          const rejectOnAbort = () => reject(signal.reason);
          signal.addEventListener("abort", rejectOnAbort, { once: true });
          if (signal.aborted) rejectOnAbort();
        });
      },
    );
    const signalGroup = vi.fn();
    const observed = observeOwnedProcessGroups(
      ownership.runId,
      [ownership.processGroupId],
      {
        listProcesses,
        environment: vi.fn(() => Promise.resolve({})),
        runTokens: vi.fn(() =>
          Promise.resolve(
            new Map([
              [
                ownership.leaderPid,
                { state: "unavailable" as const, reason: "token unavailable" },
              ],
            ]),
          ),
        ),
        signalGroup,
      },
      controller.signal,
    ).then(
      (value) => ({ kind: "resolved" as const, value }),
      (cause: unknown) => ({ kind: "rejected" as const, cause }),
    );
    let settled = false;
    const observedOutcome = observed.then((outcome) => {
      settled = true;
      return outcome;
    });
    let settledBeforeRelease = false;
    try {
      await secondListStarted;
      controller.abort(reason);
      await new Promise<void>((resolve) => setImmediate(resolve));
      settledBeforeRelease = settled;
    } finally {
      releaseSecondList?.();
    }

    const outcome = await observedOutcome;
    expect(settledBeforeRelease).toBe(true);
    expect(signalAtSecondList).toBe(controller.signal);
    expect(outcome.kind).toBe("rejected");
    if (outcome.kind !== "rejected")
      throw new Error(
        "The cancelled process observation unexpectedly resolved",
      );
    expect(outcome.cause).toBe(reason);
    expect(signalGroup).not.toHaveBeenCalled();
    expect(listProcesses).toHaveBeenCalledTimes(2);
  });

  it("preserves cancellation when a liveness recheck returns successfully after abort", async () => {
    const controller = new AbortController();
    const reason = new Error("cancel at liveness completion");
    const listProcesses = vi
      .fn<ProcessOwnershipHost["listProcesses"]>()
      .mockResolvedValueOnce(processes)
      .mockImplementation(async (signal) => {
        expect(signal).toBe(controller.signal);
        controller.abort(reason);
        return [];
      });
    const signalGroup = vi.fn();
    await expect(
      observeOwnedProcessGroups(
        ownership.runId,
        [ownership.processGroupId],
        {
          listProcesses,
          environment: async () => {
            throw new Error("token unavailable");
          },
          signalGroup,
        },
        controller.signal,
      ),
    ).rejects.toBe(reason);
    expect(listProcesses).toHaveBeenCalledTimes(2);
    expect(signalGroup).not.toHaveBeenCalled();
  });
});

describe("multi-group observation short-circuit", () => {
  it("stops missing-row fallbacks once every live group is unverifiable", async () => {
    const listProcesses = vi.fn(() => Promise.resolve(processes));
    const environment = vi.fn((pid: number) =>
      Promise.resolve({
        REA_PROCESS_RUN_ID: pid === 100 ? "other-run" : ownership.runId,
      }),
    );
    const runTokens = vi.fn<NonNullable<ProcessOwnershipHost["runTokens"]>>(
      () => Promise.resolve(new Map()),
    );

    await expect(
      observeOwnedProcessGroups(ownership.runId, [100], {
        listProcesses,
        environment,
        runTokens,
        signalGroup: vi.fn(),
      }),
    ).resolves.toEqual(
      new Map([
        [
          100,
          { state: "unverifiable", reason: "process ownership did not match" },
        ],
      ]),
    );
    expect(runTokens).toHaveBeenCalledTimes(1);
    expect(environment.mock.calls).toEqual([[100]]);
    expect(listProcesses).toHaveBeenCalledTimes(1);
  });
});

it("builds lineage from same-generation native parent/group facts", async () => {
  const rows = [
    { ...processes[0]!, pid: 100, parentPid: 1, processGroupId: 100 },
    { ...processes[1]!, pid: 101, parentPid: 1, processGroupId: 200 },
  ];
  const host: ProcessOwnershipHost = {
    listProcesses: () => Promise.resolve(rows),
    environment: () => Promise.resolve({}),
    runTokens: (members) =>
      Promise.resolve(
        new Map(
          members.map(({ pid }) => [
            pid,
            { state: "readable" as const, runId: ownership.runId },
          ]),
        ),
      ),
    processIdentities: (members) =>
      Promise.resolve(
        new Map(
          members.map((member) => [
            member.pid,
            {
              state: "readable" as const,
              identity: `start-${String(member.pid)}`,
              relation: {
                state: "observed" as const,
                parentPid: member.pid === 100 ? 1 : 100,
                processGroupId: member.pid === 100 ? 100 : 200,
              },
            },
          ]),
        ),
      ),
    signalGroup: vi.fn(),
  };

  await expect(
    observeOwnedProcessLineage(ownership, host),
  ).resolves.toMatchObject({
    status: "verified",
    lineage: {
      launcherParentPid: 1,
      processGroupId: 100,
      descendants: [{ pid: 101, parentPid: 100, processGroupId: 200 }],
    },
  });
});

it("observes group and lineage with one batch each and falls back only for missing rows", async () => {
  const { adapter } = host({
    100: { REA_PROCESS_RUN_ID: ownership.runId },
    101: { REA_PROCESS_RUN_ID: ownership.runId },
  });
  const environment = vi.fn(adapter.environment);
  const runTokens = vi.fn<NonNullable<ProcessOwnershipHost["runTokens"]>>(() =>
    Promise.resolve(
      new Map([[100, { state: "readable", runId: ownership.runId }]]),
    ),
  );
  const observedHost = { ...adapter, environment, runTokens };
  await expect(
    observeOwnedProcessGroups(
      ownership.runId,
      [ownership.processGroupId],
      observedHost,
    ),
  ).resolves.toEqual(new Map([[ownership.processGroupId, { state: "alive" }]]));
  await expect(
    observeOwnedProcessLineage(ownership, observedHost),
  ).resolves.toMatchObject({
    status: "verified",
    lineage: {
      descendants: [{ pid: 101, parentPid: 100, processGroupId: 100 }],
    },
  });
  expect(runTokens.mock.calls).toEqual([[processes], [processes]]);
  expect(environment.mock.calls).toEqual([[101], [101]]);
});

it.each(["batch", "environment"] as const)(
  "preserves cancellation during %s reads, including successful completion races",
  async (boundary) => {
    const controller = new AbortController();
    const reason = new Error("cancelled ownership read");
    const listProcesses = vi.fn(() => Promise.resolve(processes));
    const environment = vi.fn<ProcessOwnershipHost["environment"]>(
      async (_pid, signal) => {
        expect(signal).toBe(controller.signal);
        controller.abort(reason);
        return { REA_PROCESS_RUN_ID: ownership.runId };
      },
    );
    const runTokens = vi.fn<NonNullable<ProcessOwnershipHost["runTokens"]>>(
      async (_processes, signal) => {
        expect(signal).toBe(controller.signal);
        if (boundary === "batch") controller.abort(reason);
        return new Map();
      },
    );
    await expect(
      observeOwnedProcessGroups(
        ownership.runId,
        [ownership.processGroupId],
        { listProcesses, environment, runTokens, signalGroup: vi.fn() },
        controller.signal,
      ),
    ).rejects.toBe(reason);
    expect(listProcesses).toHaveBeenCalledTimes(1);
    expect(environment).toHaveBeenCalledTimes(boundary === "batch" ? 0 : 1);
  },
);

it.each([100, 101])(
  "rechecks unavailable batch rows for exited PID %i without overriding them through fallback",
  async (exitedPid) => {
    const listProcesses = vi
      .fn<ProcessOwnershipHost["listProcesses"]>()
      .mockResolvedValueOnce(processes)
      .mockResolvedValue(processes.filter(({ pid }) => pid !== exitedPid));
    const environment = vi.fn(() =>
      Promise.resolve({ REA_PROCESS_RUN_ID: ownership.runId }),
    );
    const observedHost: ProcessOwnershipHost = {
      listProcesses,
      environment,
      signalGroup: vi.fn(),
      runTokens: () =>
        Promise.resolve(
          new Map(
            processes.map(({ pid }) => [
              pid,
              pid === exitedPid
                ? { state: "unavailable" as const, reason: "process exited" }
                : { state: "readable" as const, runId: ownership.runId },
            ]),
          ),
        ),
    };
    const result = await observeOwnedProcessLineage(ownership, observedHost);
    if (exitedPid === 100)
      expect(result).toMatchObject({
        status: "unavailable",
        reason: "owned launcher exited during lineage validation",
      });
    else
      expect(result).toMatchObject({
        status: "verified",
        lineage: { descendants: [] },
      });
    expect(environment).not.toHaveBeenCalled();
  },
);

describe("token sweep batch failures", () => {
  it("cleans token-owned groups when a failed batch has readable fallback observations", async () => {
    const { adapter, signalGroup } = host({
      100: { REA_PROCESS_RUN_ID: ownership.runId },
      101: { REA_PROCESS_RUN_ID: ownership.runId },
    });
    await expect(
      cleanupOwnedProcessGroup(
        { ...ownership, sweepTokenOwnedProcesses: true, captureBaseline: [] },
        {
          ...adapter,
          runTokens: () =>
            Promise.reject(new Error("batch reader unavailable")),
        },
      ),
    ).resolves.toEqual({ cleaned: true, signaled: true });
    expect(signalGroup.mock.calls).toEqual([[100, "SIGKILL"]]);
  });

  it("uses fallback ownership when the initial batch fails and preserves both failures through retries", async () => {
    const signalGroup = vi.fn();
    const adapter: ProcessOwnershipHost = {
      listProcesses: () => Promise.resolve(processes),
      environment: (pid) =>
        pid === 100
          ? Promise.resolve({ REA_PROCESS_RUN_ID: ownership.runId })
          : Promise.reject(new Error("individual unreadable")),
      runTokens: () => Promise.reject(new Error("batch reader unavailable")),
      signalGroup,
    };
    const result = await cleanupOwnedProcessGroup(
      { ...ownership, sweepTokenOwnedProcesses: true, captureBaseline: [] },
      adapter,
    );
    expect(result).toMatchObject({
      cleaned: false,
      failures: expect.arrayContaining([
        expect.objectContaining({
          pid: 101,
          diagnostic:
            "individual unreadable; run-token batch failed: batch reader unavailable",
        }),
      ]),
    });
    expect(signalGroup).not.toHaveBeenCalled();
  });
});

it.each(["parent", "group"] as const)(
  "keeps a changed native launcher %s relation unavailable instead of publishing the earlier relation",
  async (changedRelation) => {
    const evidenceOwner = new ProcessOwnershipEvidenceOwner();
    const launcher = {
      pid: 100,
      parentPid: 20,
      processGroupId: 100,
      state: "S",
      command: "fixture",
    };
    let tokenRead = false;
    const currentRelation = () => ({
      state: "observed" as const,
      parentPid: tokenRead && changedRelation === "parent" ? 1 : 20,
      processGroupId: tokenRead && changedRelation === "group" ? 200 : 100,
    });
    const host: ProcessOwnershipHost = {
      listProcesses: async () => [launcher],
      environment: async () => ({}),
      runTokens: async (members) => {
        tokenRead = true;
        return new Map(
          members.map(({ pid }) => [
            pid,
            { state: "readable" as const, runId: "run" },
          ]),
        );
      },
      processIdentities: async (members) =>
        new Map(
          members.map(({ pid }) => [
            pid,
            {
              state: "readable" as const,
              identity: "same-launcher-generation",
              relation: currentRelation(),
            },
          ]),
        ),
      signalGroup: vi.fn(),
    };
    const result = await observeOwnedProcessLineage(
      {
        runId: "run",
        leaderPid: 100,
        processGroupId: 100,
        expectedParentPid: 20,
        evidenceOwner,
      },
      host,
    );
    expect(result).toMatchObject({ status: "unavailable" });
    expect(evidenceOwner.candidates).toMatchObject([
      {
        pid: 100,
        applicability: "token-verified",
        relation: currentRelation(),
      },
    ]);
    expect(host.signalGroup).not.toHaveBeenCalled();
  },
);