/**
 * @file server-s3-system.test.js
 * @description S3 plan, P2 (one Linux user per account), with every sudo and
 * systemctl call faked: the system-unit service manager (host-owned env file,
 * sudo for start/stop/restart, pure-fs staleness), service-manager picking it,
 * Quit stopping it through sudo, the Linux-account layer (server.conf, name
 * rule, the exact provision argv), user create provisioning FIRST, disable
 * ending the logins first (and locking only an account that exists), and a
 * member's bootstrap doing nothing.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, before, after, beforeEach } = require("node:test");
const assert = require("node:assert/strict");
const path = require("node:path");
const fs = require("node:fs");
const os = require("node:os");

const TMP = fs.mkdtempSync(path.join(os.tmpdir(), "server-s3-system-"));
process.env.DASHBOARD_DB_PATH = path.join(TMP, "dashboard.db");
process.env.DASHBOARD_DATA_DIR = path.join(TMP, "data");
process.env.AGENTHUB_SYSTEM_UNIT_DIR = path.join(TMP, "units");
process.env.AGENTHUB_SERVER_CONF = path.join(TMP, "server.conf");
// `lin` has a Linux account; `pre` (made before S3) and `Old.Name` do not.
process.env.AGENTHUB_PASSWD = path.join(TMP, "passwd");
fs.writeFileSync(process.env.AGENTHUB_PASSWD, "ah-lin:x:5101:5101::/:/bin/sh\n");

const sys = require("../../scripts/systemd-system-service");
const linux = require("../lib/linux-accounts");
const auth = require("../lib/auth");
const { db } = require("../db");

const UNIT = path.join(process.env.AGENTHUB_SYSTEM_UNIT_DIR, "agenthub.service");
const writeUnit = () => {
  fs.mkdirSync(path.dirname(UNIT), { recursive: true });
  fs.writeFileSync(UNIT, `[Unit]\n${sys.MARKER}\n`);
};
const writeConf = (uid = 4242) => {
  linux.__resetConfCache();
  fs.writeFileSync(
    process.env.AGENTHUB_SERVER_CONF,
    `HOST_USER=host\nHOST_UID=${uid}\nUSERS_ROOT=/srv/agenthub/users\nPORT=4820\n`
  );
};

after(() => {
  sys.__reset();
  delete process.env.AGENTHUB_MODE;
  fs.rmSync(TMP, { recursive: true, force: true });
});

describe("the system-unit service manager", () => {
  let calls;
  beforeEach(() => {
    calls = [];
    fs.rmSync(path.dirname(UNIT), { recursive: true, force: true });
    fs.rmSync(sys.envPath(), { force: true });
    sys.__setExecImpl(
      (args) => {
        calls.push(["systemctl", ...args]);
        return { status: 0, stdout: args[0] === "is-active" ? "active\n" : "enabled\n" };
      },
      (args) => {
        calls.push(["sudo", "-n", "systemctl", ...args]);
        return { status: 0 };
      }
    );
  });

  it("is unavailable, and changes nothing, without its unit", () => {
    assert.equal(sys.unitIsOurs("agenthub"), false);
    assert.equal(sys.systemctlAvailable(), false);
    assert.equal(sys.writeUserService({ argv: ["/n", "/r/server/index.js"] }), "unavailable");
    assert.equal(sys.restartUserService("agenthub"), "unavailable");
    assert.deepEqual(calls, []);
  });

  it("repoints by rewriting the host-owned env file, never the unit", () => {
    writeUnit();
    const unitBefore = fs.readFileSync(UNIT, "utf8");
    const unit = {
      argv: ["/usr/bin/node", "/plugins/v2/server/index.js"],
      env: { NODE_ENV: "production" },
    };
    assert.equal(sys.writeUserService(unit), "written");
    assert.equal(sys.writeUserService(unit), "unchanged");
    const env = fs.readFileSync(sys.envPath(), "utf8");
    assert.match(env, /^AGENTHUB_NODE=\/usr\/bin\/node$/m);
    assert.match(env, /^AGENTHUB_ROOT=\/plugins\/v2$/m);
    assert.match(env, /^NODE_ENV=production$/m);
    assert.equal(fs.statSync(sys.envPath()).mode & 0o777, 0o600);
    assert.equal(fs.readFileSync(UNIT, "utf8"), unitBefore);
    assert.equal(sys.unitRoot("agenthub"), "/plugins/v2");
    assert.equal(sys.unitIsStale("agenthub", "/plugins/v2"), false);
    assert.equal(sys.unitIsStale("agenthub", "/plugins/v3"), true);
    assert.ok(!calls.some((c) => c[0] === "sudo"), "no root needed to repoint");
  });

  it("restarts, starts and enables only through sudo, restart without blocking", () => {
    writeUnit();
    assert.equal(sys.restartUserService("agenthub"), "restarted");
    assert.equal(sys.setUnitEnabled("agenthub", false), "ok");
    sys.installUserService({ name: "agenthub", argv: ["/n", "/r/server/index.js"] });
    const sudo = calls.filter((c) => c[0] === "sudo").map((c) => c.slice(3).join(" "));
    assert.deepEqual(sudo, [
      "restart --no-block agenthub.service",
      "disable agenthub.service",
      "start --no-block agenthub.service",
    ]);
    assert.deepEqual(sys.stopArgv("agenthub"), [
      "sudo",
      ["-n", "systemctl", "stop", "--no-block", "agenthub.service"],
    ]);
  });

  it("is what service-manager picks while the unit exists", () => {
    const load = () => {
      delete require.cache[require.resolve("../../scripts/service-manager")];
      return require("../../scripts/service-manager");
    };
    if (process.platform !== "linux") return;
    fs.rmSync(UNIT, { force: true });
    assert.notEqual(load().kind, "systemd-system");
    writeUnit();
    assert.equal(load().kind, "systemd-system");
  });

  it("lets Quit stop it through sudo, never by SIGTERM", () => {
    const { stopServer } = require("../lib/quit");
    const spawned = [];
    let killed = false;
    stopServer({
      svc: {
        ...sys,
        systemctlAvailable: () => true,
        unitIsOurs: () => true,
        unitIsActive: () => true,
      },
      spawn: (cmd, args) => {
        spawned.push([cmd, ...args]);
        return { unref() {} };
      },
      kill: () => (killed = true),
    });
    assert.deepEqual(spawned, [
      ["sudo", "-n", "systemctl", "stop", "--no-block", "agenthub.service"],
    ]);
    assert.equal(killed, false);
  });
});

describe("Linux accounts", () => {
  let argvs;
  let failNext;
  before(() => {
    linux.__setRunImpl((argv) => {
      argvs.push(argv);
      if (failNext) {
        failNext = false;
        throw Object.assign(new Error("exit 4"), { stderr: "agenthub-provision: ah-x exists\n" });
      }
      return `ok ${argv[1]} ${argv[2]}\n`;
    });
  });
  beforeEach(() => {
    argvs = [];
    failNext = false;
    writeConf();
    process.env.AGENTHUB_MODE = "server";
  });

  it("is off outside server mode or without server.conf", () => {
    delete process.env.AGENTHUB_MODE;
    assert.equal(linux.s3Enabled(), false);
    assert.equal(linux.provision("create", "anyone"), null);
    process.env.AGENTHUB_MODE = "server";
    fs.rmSync(process.env.AGENTHUB_SERVER_CONF);
    linux.__resetConfCache();
    assert.equal(linux.s3Enabled(), false);
    assert.equal(linux.accountFor("mia"), null);
    assert.deepEqual(argvs, []);
  });

  it("reads server.conf and maps a user to ah-<name> under USERS_ROOT", () => {
    assert.deepEqual(linux.serverConf(), {
      hostUser: "host",
      hostUid: 4242,
      usersRoot: "/srv/agenthub/users",
      port: 4820,
      bins: {},
    });
    assert.deepEqual(linux.accountFor("mia"), {
      login: "ah-mia",
      home: "/srv/agenthub/users/mia",
    });
  });

  it("refuses a name Linux cannot take, before any sudo", () => {
    for (const bad of ["Mia", "1mia", "mi.a", "-x", "a".repeat(30), "root;id", "../x"]) {
      assert.throws(() => linux.provision("create", bad), { code: "EBADUSER" }, bad);
    }
    assert.throws(() => linux.provision("delete", "mia"), /unknown provision action/);
    assert.deepEqual(argvs, []);
  });

  it("calls exactly the provision helper with an action and a name", () => {
    linux.provision("create", "mia");
    linux.provision("disable", "mia");
    assert.deepEqual(argvs, [
      ["/opt/agenthub/sbin/agenthub-provision", "create", "mia"],
      ["/opt/agenthub/sbin/agenthub-provision", "disable", "mia"],
    ]);
  });

  it("creates the Linux account BEFORE the user, and no user when that fails", async () => {
    const made = await auth.createUser("lin", "member-pass-1", "developer");
    assert.equal(made.username, "lin");
    assert.deepEqual(argvs[0], ["/opt/agenthub/sbin/agenthub-provision", "create", "lin"]);
    failNext = true;
    await assert.rejects(auth.createUser("lux", "member-pass-1", "developer"), {
      code: "EPROVISION",
      message: /ah-x exists/,
    });
    assert.equal(db.prepare("SELECT 1 FROM users WHERE username = 'lux'").get(), undefined);
    await assert.rejects(auth.createUser("Lux", "member-pass-1", "developer"), {
      code: "EBADUSER",
    });
  });

  it("ends the logins first on disable, then locks the Linux account", () => {
    argvs = [];
    failNext = true;
    // A failed lock is still reported — but the dashboard access is gone.
    assert.throws(() => auth.setDisabled("lin", true), { code: "EPROVISION" });
    assert.equal(db.prepare("SELECT disabled FROM users WHERE username = 'lin'").get().disabled, 1);
    auth.setDisabled("lin", false);
    assert.equal(db.prepare("SELECT disabled FROM users WHERE username = 'lin'").get().disabled, 0);
    auth.setDisabled("lin", true);
    assert.equal(db.prepare("SELECT disabled FROM users WHERE username = 'lin'").get().disabled, 1);
    assert.deepEqual(
      argvs.map((a) => a[1]),
      ["disable", "enable", "disable"]
    );
  });

  it("disables and enables a user who has no Linux account, with no sudo", () => {
    argvs = [];
    for (const n of ["pre", "Old.Name"]) {
      db.prepare("INSERT INTO users (username, password_hash) VALUES (?, 'x')").run(n);
      const id = db.prepare("SELECT id FROM users WHERE username = ?").get(n).id;
      db.prepare(
        "INSERT INTO auth_sessions (token_hash, user_id, expires_at) VALUES (?, ?, '2999-01-01')"
      ).run(`h-${n}`, id);
      auth.setDisabled(n, true);
      const row = db.prepare("SELECT disabled FROM users WHERE id = ?").get(id);
      assert.equal(row.disabled, 1, n);
      assert.equal(
        db.prepare("SELECT 1 FROM auth_sessions WHERE user_id = ?").get(id),
        undefined,
        `${n}'s logins end`
      );
      auth.setDisabled(n, false);
      assert.equal(db.prepare("SELECT disabled FROM users WHERE id = ?").get(id).disabled, 0, n);
    }
    assert.deepEqual(argvs, []);
  });
});

describe("a member's plugin bootstrap", () => {
  it("does nothing under another uid than the host's", () => {
    const { notTheHost, bootstrap } = require("../../scripts/plugin-bootstrap");
    writeConf(process.getuid() + 1);
    assert.equal(notTheHost(), true);
    assert.equal(bootstrap(path.join(TMP, "member-rt")), "not-host");
    assert.equal(fs.existsSync(path.join(TMP, "member-rt")), false);
    writeConf(process.getuid());
    assert.equal(notTheHost(), false);
    fs.rmSync(process.env.AGENTHUB_SERVER_CONF);
    assert.equal(notTheHost(), false);
  });
});