import { afterEach, expect, test, vi } from "vitest";
import { resetDiagnosticSessionStateForTest } from "../logging/diagnostic-session-state.js";
import type { ProcessSession } from "./bash-process-registry.js";
import {
  addSession,
  appendOutput,
  markExited,
  resetProcessRegistryForTests,
} from "./bash-process-registry.js";
import { createProcessTool } from "./bash-tools.process.js";

afterEach(() => {
  resetProcessRegistryForTests();
  resetDiagnosticSessionStateForTest();
});

function createBackgroundSession(id: string): ProcessSession {
  return {
    id,
    command: "test",
    startedAt: Date.now(),
    cwd: "/tmp",
    maxOutputChars: 10_000,
    pendingMaxOutputChars: 30_000,
    totalOutputChars: 0,
    pendingStdout: [],
    pendingStderr: [],
    pendingStdoutChars: 0,
    pendingStderrChars: 0,
    aggregated: "",
    tail: "",
    exited: false,
    exitCode: undefined,
    exitSignal: undefined,
    truncated: false,
    backgrounded: true,
  };
}

function createProcessSessionHarness(sessionId: string) {
  const processTool = createProcessTool();
  const session = createBackgroundSession(sessionId);
  addSession(session);
  return { processTool, session };
}

async function pollSession(
  processTool: ReturnType<typeof createProcessTool>,
  callId: string,
  sessionId: string,
  timeout?: number | string,
) {
  return processTool.execute(callId, {
    action: "poll",
    sessionId,
    ...(timeout === undefined ? {} : { timeout }),
  });
}

function retryMs(result: Awaited<ReturnType<ReturnType<typeof createProcessTool>["execute"]>>) {
  return (result.details as { retryInMs?: number }).retryInMs;
}

function pollStatus(result: Awaited<ReturnType<ReturnType<typeof createProcessTool>["execute"]>>) {
  return (result.details as { status?: string }).status;
}

test("process poll waits for completion when timeout is provided", async () => {
  vi.useFakeTimers();
  try {
    const sessionId = "sess";
    const { processTool, session } = createProcessSessionHarness(sessionId);

    setTimeout(() => {
      appendOutput(session, "stdout", "done\n");
      markExited(session, 0, null, "completed");
    }, 10);

    const pollPromise = pollSession(processTool, "toolcall", sessionId, 2000);

    let resolved = false;
    void pollPromise.finally(() => {
      resolved = true;
    });

    await vi.advanceTimersByTimeAsync(200);
    expect(resolved).toBe(false);

    await vi.advanceTimersByTimeAsync(100);
    const poll = await pollPromise;
    const details = poll.details as { status?: string; aggregated?: string };
    expect(details.status).toBe("completed");
    expect(details.aggregated ?? "").toContain("done");
  } finally {
    vi.useRealTimers();
  }
});

test("process poll accepts string timeout values", async () => {
  vi.useFakeTimers();
  try {
    const sessionId = "sess-2";
    const { processTool, session } = createProcessSessionHarness(sessionId);
    setTimeout(() => {
      appendOutput(session, "stdout", "done\n");
      markExited(session, 0, null, "completed");
    }, 10);

    const pollPromise = pollSession(processTool, "toolcall", sessionId, "2000");
    await vi.advanceTimersByTimeAsync(350);
    const poll = await pollPromise;
    const details = poll.details as { status?: string; aggregated?: string };
    expect(details.status).toBe("completed");
    expect(details.aggregated ?? "").toContain("done");
  } finally {
    vi.useRealTimers();
  }
});

test("process poll exposes adaptive retryInMs for repeated no-output polls", async () => {
  const sessionId = "sess-retry";
  const { processTool } = createProcessSessionHarness(sessionId);

  const polls = await Promise.all([
    pollSession(processTool, "toolcall-1", sessionId),
    pollSession(processTool, "toolcall-2", sessionId),
    pollSession(processTool, "toolcall-3", sessionId),
    pollSession(processTool, "toolcall-4", sessionId),
    pollSession(processTool, "toolcall-5", sessionId),
  ]);

  expect(polls.map((poll) => retryMs(poll))).toEqual([5000, 10000, 30000, 60000, 60000]);
});

test("process poll resets retryInMs when output appears and clears on completion", async () => {
  const sessionId = "sess-reset";
  const { processTool, session } = createProcessSessionHarness(sessionId);

  const poll1 = await pollSession(processTool, "toolcall-1", sessionId);
  const poll2 = await pollSession(processTool, "toolcall-2", sessionId);
  expect(retryMs(poll1)).toBe(5000);
  expect(retryMs(poll2)).toBe(10000);

  appendOutput(session, "stdout", "step complete\n");
  const pollWithOutput = await pollSession(processTool, "toolcall-output", sessionId);
  expect(retryMs(pollWithOutput)).toBe(5000);

  markExited(session, 0, null, "completed");
  const pollCompleted = await pollSession(processTool, "toolcall-completed", sessionId);
  expect(pollStatus(pollCompleted)).toBe("completed");
  expect(retryMs(pollCompleted)).toBeUndefined();

  const pollFinished = await pollSession(processTool, "toolcall-finished", sessionId);
  expect(pollStatus(pollFinished)).toBe("completed");
  expect(retryMs(pollFinished)).toBeUndefined();
});