import { describe, expect, test } from "bun:test";
import {
  compareVersions,
  createVersionObserver,
  installVersion,
  waitForVersionUpdate,
} from "../../lib/version-update";

const tick = () => new Promise<void>((resolve) => setTimeout(resolve, 0));

describe("server version updates", () => {
  test("compares strict SemVer precedence including prereleases and ignores build metadata", () => {
    expect(compareVersions("2.6.1", "2.6.1-rc3")).toBe(1);
    expect(compareVersions("2.6.1-rc.10", "2.6.1-rc.3")).toBe(1);
    expect(compareVersions("2.6.1-alpha.1", "2.6.1-alpha.beta")).toBe(-1);
    expect(compareVersions("2.6.1-rc3.1", "2.6.1-rc3")).toBe(1);
    expect(compareVersions("2.6.1+new", "2.6.1+old")).toBe(0);
    expect(compareVersions("3.0.0", "2.6.1")).toBe(1);
    for (const invalid of [
      "",
      "v3.0.0",
      "3.0",
      "03.0.0",
      "3.0.0-rc.01",
      "3.0.0-",
      "3.0.0+",
      "3.0.0;touch /tmp/pwned",
      "3.0.0\n",
      "3.0.0-💥",
      "9".repeat(129) + ".0.0",
    ]) {
      expect(compareVersions(invalid, "2.6.1-rc3")).toBeUndefined();
    }
  });

  test("rejects invalid install arguments before spawning", async () => {
    expect(await installVersion("2.7.0;echo hacked")).toBe(false);
  });

  test("uses a quiet Bun install with explicit inherited environment", async () => {
    const calls: string[][] = [];
    const spawn = (
      argv: string[],
      options: {
        stdin: "ignore";
        stdout: "ignore";
        stderr: "ignore";
        env: NodeJS.ProcessEnv;
      },
    ) => {
      calls.push(argv);
      expect(options).toEqual({
        stdin: "ignore",
        stdout: "ignore",
        stderr: "ignore",
        env: process.env,
      });
      expect(options.env.PATH).toBe(process.env.PATH);
      return {
        exited: Promise.resolve(0),
        kill: () => {
          throw new Error("unexpected kill");
        },
      };
    };
    expect(await installVersion("2.7.0-rc.1+build.2", spawn, 2)).toBe(true);
    expect(calls).toEqual([
      [
        process.execPath,
        "i",
        "-g",
        "--no-cache",
        "@dmgnr/kuber@2.7.0-rc.1+build.2",
      ],
    ]);
  });

  test("kills a stalled installer and treats late success as failure", async () => {
    let finish!: (code: number) => void;
    const exited = new Promise<number>((resolve) => {
      finish = resolve;
    });
    const signals: (NodeJS.Signals | undefined)[] = [];
    const installing = installVersion(
      "2.7.0",
      () => ({
        exited,
        kill: (signal) => {
          signals.push(signal);
          finish(0);
        },
      }),
      1,
    );
    expect(await installing).toBe(false);
    expect(signals).toEqual([undefined]);
  });

  test("handles spawn errors and bounds an unresponsive child", async () => {
    expect(
      await installVersion("2.7.0", () => {
        throw new Error("spawn failed");
      }),
    ).toBe(false);
    const signals: (NodeJS.Signals | undefined)[] = [];
    expect(
      await installVersion(
        "2.7.0",
        () => ({
          exited: new Promise<number>(() => {}),
          kill: (signal) => {
            signals.push(signal);
          },
        }),
        1,
      ),
    ).toBe(false);
    expect(signals).toEqual([undefined, "SIGKILL"]);
  });

  test("ignores malformed and exactly equal headers without attempting an install", async () => {
    const runs: string[] = [];
    const lines: string[] = [];
    const observe = createVersionObserver({
      currentVersion: "2.6.1-rc3",
      runner: async (version) => {
        runs.push(version);
        return true;
      },
      report: (line) => lines.push(line),
    });
    for (const version of [null, "garbage", "2.6.1-rc3"]) observe(version);
    await tick();
    expect(runs).toEqual([]);
    expect(lines).toEqual([]);
  });

  test("starts once for concurrent newer responses, reports success in gray on stderr", async () => {
    let finish!: (value: boolean) => void;
    const pending = new Promise<boolean>((resolve) => {
      finish = resolve;
    });
    const runs: string[] = [];
    const lines: string[] = [];
    const observe = createVersionObserver({
      currentVersion: "2.6.1-rc3",
      runner: (version) => {
        runs.push(version);
        return pending;
      },
      report: (line) => lines.push(line),
    });
    observe("2.6.1");
    observe("9.0.0");
    expect(runs).toEqual([]);
    await tick();
    expect(runs).toEqual(["2.6.1"]);
    expect(lines).toEqual([]);
    finish(true);
    await waitForVersionUpdate();
    expect(lines).toEqual(["\x1b[90m+ Updated to 2.6.1\x1b[0m\n"]);
    observe("10.0.0");
    await tick();
    expect(runs).toHaveLength(1);
  });

  test("reports failure or rejection once without throwing into requests", async () => {
    for (const runner of [
      async () => false,
      async () => {
        throw new Error("offline");
      },
    ]) {
      const lines: string[] = [];
      const observe = createVersionObserver({
        currentVersion: "2.6.1-rc3",
        runner,
        report: (line) => lines.push(line),
      });
      observe("2.7.0");
      observe("2.8.0");
      await tick();
      expect(lines).toEqual([
        "\x1b[90m+ New version available: 2.7.0\x1b[0m\n",
      ]);
    }
  });

  test("a short subprocess emits one outcome to stderr when its runner settles", async () => {
    const url = new URL("../../lib/version-update.ts", import.meta.url).href;
    for (const result of ["true", "false", "reject"]) {
      const script = `
        const { createVersionObserver } = await import(${JSON.stringify(url)});
        createVersionObserver({ currentVersion: '2.6.1',
          runner: async () => ${result === "reject" ? "Promise.reject(Error('offline'))" : result} })('2.7.0');
        await new Promise(resolve => setTimeout(resolve, 20));
      `;
      const child = Bun.spawn([process.execPath, "-e", script], {
        stdin: "ignore",
        stdout: "pipe",
        stderr: "pipe",
      });
      expect(await child.exited).toBe(0);
      expect(await new Response(child.stdout).text()).toBe("");
      expect(await new Response(child.stderr).text()).toBe(
        `\x1b[90m+ ${result === "true" ? "Updated to " : "New version available: "}2.7.0\x1b[0m\n`,
      );
    }
  });
});