/**
 * Tests for `run` in `src/cli-run.ts`, which every CLI command goes through.
 */

import { PassThrough } from "node:stream";
import { describe, it, expect } from "vitest";

import { ApiError } from "../../src/api/client.js";
import { run } from "../../src/cli-run.js";

// A stream whose written text is kept in `text`; writes finish at once, so
// nothing is left waiting to drain.
const collector = (): { stream: PassThrough; text: () => string } => {
    const stream = new PassThrough();
    const chunks: string[] = [];
    stream.on("data", (chunk: Buffer) => chunks.push(chunk.toString()));
    return { stream, text: () => chunks.join("") };
};

const runToExit = async (
    command: Promise<number>,
): Promise<{ code: number; stdout: string; stderr: string }> => {
    const stdout = collector();
    const stderr = collector();
    const code = await new Promise<number>((resolve) => {
        void run(command, stdout.stream, stderr.stream, resolve);
    });
    return { code, stdout: stdout.text(), stderr: stderr.text() };
};

describe("run", () => {
    it("exits with the code the command returns", async () => {
        const result = await runToExit(Promise.resolve(3));
        expect(result).toEqual({ code: 3, stdout: "", stderr: "" });
    });

    it("prints a thrown error as one line without a stack trace and exits 1", async () => {
        const failing = async (): Promise<number> => {
            throw new Error(
                "ENOTDIR: not a directory, mkdir '/dev/null/x/originals'",
            );
        };
        const result = await runToExit(failing());
        expect(result.code).toBe(1);
        expect(result.stdout).toBe("");
        expect(result.stderr).toBe(
            "quak: ENOTDIR: not a directory, mkdir '/dev/null/x/originals'\n",
        );
    });

    // Node's `fetch` rejects every failure below HTTP with a TypeError that
    // says only "fetch failed", and hangs the reason, with its errno, off
    // `cause`. The printed line carries the reason, so a cron log tells a
    // refused connection from a name that did not resolve.
    it("prints the reason a fetch failed, from the error's cause", async () => {
        const refused = new TypeError("fetch failed", {
            cause: Object.assign(
                new Error("connect ECONNREFUSED 1.2.3.4:443"),
                { code: "ECONNREFUSED" },
            ),
        });
        const result = await runToExit(Promise.reject(refused));
        expect(result).toEqual({
            code: 1,
            stdout: "",
            stderr: "quak: fetch failed: connect ECONNREFUSED 1.2.3.4:443\n",
        });
    });

    // When the host has several addresses and every one refuses, Node's
    // `fetch` gives as the cause an AggregateError with an empty message and
    // one error per address. The printed line gives each address's reason.
    it("prints the reason for each address a fetch could not reach", async () => {
        const refusedAt = (address: string): Error =>
            Object.assign(new Error(`connect ECONNREFUSED ${address}`), {
                code: "ECONNREFUSED",
            });
        const refused = new TypeError("fetch failed", {
            cause: Object.assign(
                new AggregateError([
                    refusedAt("2001:db8::1:443"),
                    refusedAt("1.2.3.4:443"),
                ]),
                { code: "ECONNREFUSED" },
            ),
        });
        const result = await runToExit(Promise.reject(refused));
        expect(result).toEqual({
            code: 1,
            stdout: "",
            stderr: "quak: fetch failed: connect ECONNREFUSED 2001:db8::1:443, connect ECONNREFUSED 1.2.3.4:443\n",
        });
    });

    // An error that already quotes its cause's message is printed as it is.
    it("does not print a cause's message twice", async () => {
        const reset = new Error("read ECONNRESET");
        const wrapped = new Error(`download: file 7: ${reset.message}`, {
            cause: reset,
        });
        const result = await runToExit(Promise.reject(wrapped));
        expect(result.stderr).toBe("quak: download: file 7: read ECONNRESET\n");
    });

    // OpenSSL ends its message for a failed TLS connection, such as one to a
    // server that answers in plain HTTP, with a newline. The printed line is
    // still one line.
    it("prints a cause's message without the white space around it", async () => {
        const wrongVersion = new TypeError("fetch failed", {
            cause: Object.assign(
                new Error(
                    "C0B73A55A47F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354:\n",
                ),
                { code: "ERR_SSL_WRONG_VERSION_NUMBER" },
            ),
        });
        const result = await runToExit(Promise.reject(wrongVersion));
        expect(result.stderr).toBe(
            "quak: fetch failed: C0B73A55A47F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354:\n",
        );
    });

    it("prints a thrown value that is not an Error", async () => {
        const result = await runToExit(Promise.reject("offline"));
        expect(result).toEqual({
            code: 1,
            stdout: "",
            stderr: "quak: offline\n",
        });
    });

    // A cause that is not an Error, such as a thrown string, is printed as a
    // thrown value that is not an Error is.
    it("prints a cause that is not an Error", async () => {
        const wrapped = new Error("ML data", { cause: "offline" });
        const result = await runToExit(Promise.reject(wrapped));
        expect(result.stderr).toBe("quak: ML data: offline\n");
    });

    it("on a 401 from the server says to run quak login, on one line, and exits 3", async () => {
        const result = await runToExit(
            Promise.reject(new ApiError("unauthorized", 401)),
        );
        expect(result).toEqual({
            code: 3,
            stdout: "",
            stderr: `quak: the saved session is no longer valid; run "quak login"\n`,
        });
    });

    it("prints another HTTP error as it is and exits 1", async () => {
        const result = await runToExit(
            Promise.reject(new ApiError("forbidden", 403)),
        );
        expect(result).toEqual({
            code: 1,
            stdout: "",
            stderr: "quak: forbidden\n",
        });
    });
});