import { afterEach, describe, expect, it, vi } from "vitest";
import type { GatewayService } from "./service.js";
import {
  describeGatewayServiceRestart,
  readGatewayServiceState,
  resolveGatewayService,
  startGatewayService,
} from "./service.js";
import { createMockGatewayService } from "./service.test-helpers.js";

const originalPlatformDescriptor = Object.getOwnPropertyDescriptor(process, "platform");

function setPlatform(value: NodeJS.Platform | "aix") {
  if (!originalPlatformDescriptor) {
    throw new Error("missing process.platform descriptor");
  }
  Object.defineProperty(process, "platform", {
    configurable: true,
    enumerable: originalPlatformDescriptor.enumerable ?? false,
    value,
  });
}

afterEach(() => {
  if (!originalPlatformDescriptor) {
    return;
  }
  Object.defineProperty(process, "platform", originalPlatformDescriptor);
});

function createService(overrides: Partial<GatewayService> = {}): GatewayService {
  return createMockGatewayService(overrides);
}

describe("resolveGatewayService", () => {
  it.each([
    { platform: "darwin" as const, label: "LaunchAgent", loadedText: "loaded" },
    { platform: "linux" as const, label: "systemd", loadedText: "enabled" },
    { platform: "win32" as const, label: "Scheduled Task", loadedText: "registered" },
  ])("returns the registered adapter for $platform", ({ platform, label, loadedText }) => {
    setPlatform(platform);
    const service = resolveGatewayService();
    expect(service.label).toBe(label);
    expect(service.loadedText).toBe(loadedText);
  });

  it("throws for unsupported platforms", () => {
    setPlatform("aix");
    expect(() => resolveGatewayService()).toThrow("Gateway service install not supported on aix");
  });

  it("describes scheduled restart handoffs consistently", () => {
    expect(describeGatewayServiceRestart("Gateway", { outcome: "scheduled" })).toEqual({
      scheduled: true,
      daemonActionResult: "scheduled",
      message: "restart scheduled, gateway will restart momentarily",
      progressMessage: "Gateway service restart scheduled.",
    });
  });
});

describe("readGatewayServiceState", () => {
  it("tracks installed, loaded, and running separately", async () => {
    const service = createService({
      isLoaded: vi.fn(async () => true),
      readCommand: vi.fn(async () => ({
        programArguments: ["openclaw", "gateway", "run"],
        environment: { OPENCLAW_GATEWAY_PORT: "18789" },
      })),
      readRuntime: vi.fn(async () => ({ status: "running" })),
    });

    const state = await readGatewayServiceState(service, {
      env: { OPENCLAW_GATEWAY_PORT: "1" },
    });

    expect(state.installed).toBe(true);
    expect(state.loaded).toBe(true);
    expect(state.running).toBe(true);
    expect(state.env.OPENCLAW_GATEWAY_PORT).toBe("18789");
  });
});

describe("startGatewayService", () => {
  it("returns missing-install without attempting restart", async () => {
    const service = createService();

    const result = await startGatewayService(service, {
      env: {},
      stdout: process.stdout,
    });

    expect(result.outcome).toBe("missing-install");
    expect(service.restart).not.toHaveBeenCalled();
  });

  it("restarts stopped installed services and returns post-start state", async () => {
    const readCommand = vi.fn(async () => ({
      programArguments: ["openclaw", "gateway", "run"],
      environment: { OPENCLAW_GATEWAY_PORT: "18789" },
    }));
    const isLoaded = vi
      .fn<GatewayService["isLoaded"]>()
      .mockResolvedValueOnce(false)
      .mockResolvedValueOnce(true);
    const readRuntime = vi
      .fn<GatewayService["readRuntime"]>()
      .mockResolvedValueOnce({ status: "stopped" })
      .mockResolvedValueOnce({ status: "running" });
    const service = createService({
      readCommand,
      isLoaded,
      readRuntime,
    });

    const result = await startGatewayService(service, {
      env: {},
      stdout: process.stdout,
    });

    expect(result.outcome).toBe("started");
    expect(service.restart).toHaveBeenCalledTimes(1);
    expect(result.state.installed).toBe(true);
    expect(result.state.loaded).toBe(true);
    expect(result.state.running).toBe(true);
  });

  it("falls back to missing-install when restart fails and install artifacts are gone", async () => {
    const readCommand = vi
      .fn<GatewayService["readCommand"]>()
      .mockResolvedValueOnce({
        programArguments: ["openclaw", "gateway", "run"],
      })
      .mockResolvedValueOnce(null);
    const service = createService({
      readCommand,
      restart: vi.fn(async () => {
        throw new Error("launchctl bootstrap failed");
      }),
    });

    const result = await startGatewayService(service, {
      env: {},
      stdout: process.stdout,
    });

    expect(result.outcome).toBe("missing-install");
    expect(result.state.installed).toBe(false);
  });
});