import { beforeEach, describe, expect, it, vi } from "vitest";
import { EventEmitter } from "node:events";
// ── Mock node:child_process ────────────────────────────────────────────────
const { mockSpawn } = vi.hoisted(() => ({ mockSpawn: vi.fn() }));
vi.mock("node:child_process", () => ({ spawn: mockSpawn }));
import { probeHermesBinary } from "../probe.js";
// ── Helpers ────────────────────────────────────────────────────────────────
/** Yields to the microtask and I/O queue so awaited code can continue. */
function flushAsync() {
    return new Promise((resolve) => setImmediate(resolve));
}
function makeFakeChild() {
    const main = new EventEmitter();
    const stdoutEmitter = new EventEmitter();
    const stderrEmitter = new EventEmitter();
    main.stdout = stdoutEmitter;
    main.stderr = stderrEmitter;
    main.kill = vi.fn();
    return {
        child: main,
        emitStdout: (data) => stdoutEmitter.emit("data", Buffer.from(data)),
        emitStderr: (data) => stderrEmitter.emit("data", Buffer.from(data)),
        emitError: (err) => main.emit("error", err),
        emitClose: (code) => main.emit("close", code),
    };
}
// ── Tests ──────────────────────────────────────────────────────────────────
describe("probeHermesBinary", () => {
    beforeEach(() => {
        vi.clearAllMocks();
    });
    it("returns available: false with not-found reason on ENOENT", async () => {
        // probeHermesBinary first awaits tryResolveBinaryPath (which/where spawn),
        // then spawns the --version process. We must drive them sequentially.
        const whichChild = makeFakeChild();
        const versionChild = makeFakeChild();
        mockSpawn
            .mockReturnValueOnce(whichChild.child) // which hermes
            .mockReturnValueOnce(versionChild.child); // hermes --version
        const promise = probeHermesBinary({ timeoutMs: 500 });
        // Settle the `which` call — which causes tryResolveBinaryPath to resolve.
        whichChild.emitClose(1);
        // Yield so the awaited tryResolveBinaryPath continuation runs and spawns
        // the version child before we emit its error.
        await flushAsync();
        const enoent = Object.assign(new Error("ENOENT"), { code: "ENOENT" });
        versionChild.emitError(enoent);
        const result = await promise;
        expect(result.available).toBe(false);
        expect(result.reason).toMatch(/not found on PATH/);
        expect(result.probeDurationMs).toBeGreaterThanOrEqual(0);
    });
    it("returns available: true with parsed version on success", async () => {
        const whichChild = makeFakeChild();
        const versionChild = makeFakeChild();
        mockSpawn
            .mockReturnValueOnce(whichChild.child)
            .mockReturnValueOnce(versionChild.child);
        const promise = probeHermesBinary({ binaryPath: "hermes", timeoutMs: 500 });
        whichChild.emitStdout("/usr/local/bin/hermes\n");
        whichChild.emitClose(0);
        await flushAsync();
        versionChild.emitStdout("Hermes Agent v1.2.3\n");
        versionChild.emitClose(0);
        const result = await promise;
        expect(result.available).toBe(true);
        expect(result.version).toBe("Hermes Agent v1.2.3");
        expect(result.binaryPath).toBe("/usr/local/bin/hermes");
        expect(result.reason).toBeUndefined();
        expect(result.probeDurationMs).toBeGreaterThanOrEqual(0);
    });
    it("returns available: false when version exits non-zero", async () => {
        const whichChild = makeFakeChild();
        const versionChild = makeFakeChild();
        mockSpawn
            .mockReturnValueOnce(whichChild.child)
            .mockReturnValueOnce(versionChild.child);
        const promise = probeHermesBinary({ timeoutMs: 500 });
        whichChild.emitClose(1);
        await flushAsync();
        versionChild.emitStderr("error: something went wrong");
        versionChild.emitClose(2);
        const result = await promise;
        expect(result.available).toBe(false);
        expect(result.reason).toContain("error: something went wrong");
    });
    it("uses custom binaryPath when provided", async () => {
        const whichChild = makeFakeChild();
        const versionChild = makeFakeChild();
        mockSpawn
            .mockReturnValueOnce(whichChild.child)
            .mockReturnValueOnce(versionChild.child);
        const promise = probeHermesBinary({ binaryPath: "/opt/bin/hermes", timeoutMs: 500 });
        whichChild.emitClose(1);
        await flushAsync();
        versionChild.emitStdout("Hermes Agent v2.0.0\n");
        versionChild.emitClose(0);
        const result = await promise;
        expect(result.available).toBe(true);
        expect(result.version).toBe("Hermes Agent v2.0.0");
        // Verify the version spawn used our custom path.
        const versionSpawnArgs = mockSpawn.mock.calls[1];
        expect(versionSpawnArgs[0]).toBe("/opt/bin/hermes");
        expect(versionSpawnArgs[1]).toEqual(["--version"]);
    });
});
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