/**
 * @file Tests server/lib/settings-env.js — where a setting saved from the
 * dashboard persists (a file outside the repo and outside CLAUDE_HOME, so a
 * plugin update cannot wipe it), the startup load order (real env, then the
 * checkout's `.env`, both owned, then the settings file), a save replacing
 * every earlier line for its key and writing through a symlink, and the one
 * path check both editable homes share. Every file lives in a temp dir.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

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

const ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-settings-env-"));
after(() => fs.rmSync(ROOT, { recursive: true, force: true }));

const envSettings = require("../lib/settings-env");

describe("settings-env", () => {
  let n = 0;
  let file;
  let repoEnv;
  let env;
  beforeEach(() => {
    n += 1;
    file = path.join(ROOT, `cfg${n}`, "agenthub", "settings.env");
    repoEnv = path.join(ROOT, `repo${n}.env`);
    env = {};
  });

  it("resolves its file from AGENTHUB_SETTINGS_FILE, else XDG_CONFIG_HOME, else ~/.config", () => {
    assert.equal(envSettings.settingsFilePath({ AGENTHUB_SETTINGS_FILE: "/x/s.env" }), "/x/s.env");
    assert.equal(
      envSettings.settingsFilePath({ XDG_CONFIG_HOME: "/cfg" }),
      path.join("/cfg", "agenthub", "settings.env")
    );
    assert.equal(
      envSettings.settingsFilePath({}),
      path.join(os.homedir(), ".config", "agenthub", "settings.env")
    );
  });

  it("writes one line per key, replacing in place, with no blank-line growth, at 0600", () => {
    envSettings.writeSetting("CLAUDE_HOME", "/a", file);
    envSettings.writeSetting("CODEX_HOME", "/b", file);
    envSettings.writeSetting("CLAUDE_HOME", "/c", file);
    envSettings.writeSetting("CLAUDE_HOME", "/d", file);
    assert.equal(fs.readFileSync(file, "utf8"), "CLAUDE_HOME=/d\nCODEX_HOME=/b\n");
    assert.equal(fs.statSync(file).mode & 0o777, 0o600);
    assert.equal(fs.statSync(path.dirname(file)).mode & 0o777, 0o700);
  });

  it("loads the real env first, then the checkout's .env (owned), then the settings file", () => {
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(
      file,
      "CLAUDE_HOME=/from-settings\nCODEX_HOME=~/codex\nDASHBOARD_DATA_DIR=/live\n# note\n"
    );
    fs.writeFileSync(repoEnv, 'DASHBOARD_DATA_DIR=/dev-data\nOTHER="quoted"\nCODEX_HOME=/repo\n');
    env.CODEX_HOME = "/from-env";
    const owned = envSettings.loadEnvFiles({ env, owned: [repoEnv], files: [file] });
    assert.equal(env.CODEX_HOME, "/from-env");
    // A dev checkout's own data dir wins over the one the dashboard pinned.
    assert.equal(env.DASHBOARD_DATA_DIR, "/dev-data");
    assert.equal(env.CLAUDE_HOME, "/from-settings");
    assert.equal(env.OTHER, "quoted");
    assert.ok(owned.has("CODEX_HOME"));
    assert.ok(owned.has("DASHBOARD_DATA_DIR"), "a .env key is the environment's");
    assert.ok(!owned.has("CLAUDE_HOME"));
    assert.equal(env.AGENTHUB_FILE_KEYS, "CLAUDE_HOME");
  });

  it("reads the settings file a .env names in AGENTHUB_SETTINGS_FILE", () => {
    const other = path.join(ROOT, "other", "settings.env");
    fs.mkdirSync(path.dirname(other), { recursive: true });
    fs.writeFileSync(other, "CLAUDE_HOME=/from-other\n");
    fs.writeFileSync(repoEnv, `AGENTHUB_SETTINGS_FILE=${other}\n`);
    delete env.AGENTHUB_SETTINGS_FILE;
    envSettings.loadEnvFiles({ env, owned: [repoEnv] });
    assert.equal(env.CLAUDE_HOME, "/from-other");
  });

  it("replaces a hand-written `KEY = value` line, and writes through a symlink", () => {
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(file, "# mine\nCODEX_HOME = /old\nCODEX_HOME=/older\nX=1\n");
    envSettings.writeSetting("CODEX_HOME", "/new", file);
    assert.equal(fs.readFileSync(file, "utf8"), "# mine\nCODEX_HOME=/new\nX=1\n");
    const real = path.join(ROOT, `dotfiles${n}.env`);
    fs.renameSync(file, real);
    fs.symlinkSync(real, file);
    envSettings.writeSetting("CODEX_HOME", "/newer", file);
    assert.ok(fs.lstatSync(file).isSymbolicLink());
    assert.match(fs.readFileSync(real, "utf8"), /CODEX_HOME=\/newer/);
  });

  it("expands ~/ in a loaded value and skips missing files", () => {
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(file, "CODEX_HOME=~/codex\n");
    envSettings.loadEnvFiles({ env, files: [path.join(ROOT, "missing.env"), file] });
    assert.equal(env.CODEX_HOME, path.join(os.homedir(), "codex"));
  });

  it("names the file-loaded keys, and a successor inheriting them re-reads the file", () => {
    fs.mkdirSync(path.dirname(file), { recursive: true });
    fs.writeFileSync(file, "CLAUDE_HOME=/saved\n");
    env.CODEX_HOME = "/from-env";
    envSettings.loadEnvFiles({ env, files: [file] });
    assert.equal(env.AGENTHUB_FILE_KEYS, "CLAUDE_HOME");
    // A self-restart hands this env on; the file changed meanwhile.
    fs.writeFileSync(file, "CLAUDE_HOME=/saved-later\n");
    const owned = envSettings.loadEnvFiles({ env, files: [file] });
    assert.ok(!owned.has("CLAUDE_HOME"), "a file-loaded key is not the real env's");
    assert.ok(owned.has("CODEX_HOME"));
    assert.equal(env.CLAUDE_HOME, "/saved-later");
  });

  it("refuses a value with a line break, which would inject a second key", () => {
    assert.throws(
      () => envSettings.writeSetting("CLAUDE_HOME", "/a\nNODE_OPTIONS=x", file),
      /line break/
    );
    assert.ok(!fs.existsSync(file));
  });

  describe("validateHomeDir", () => {
    const dir = () => fs.mkdtempSync(path.join(ROOT, "home-"));

    for (const bad of ["/", "/.", os.homedir(), `${os.homedir()}/`, "~/"]) {
      it(`refuses ${JSON.stringify(bad)} as too broad`, () => {
        assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", bad), { code: "EBADHOME" });
      });
    }

    it("refuses a parent of the home dir, and a symlink resolving to one", () => {
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", path.dirname(os.homedir())), {
        code: "EBADHOME",
      });
      const link = path.join(ROOT, "link-to-root");
      fs.symlinkSync("/", link);
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", link), { code: "EBADHOME" });
      const homeLink = path.join(ROOT, "link-to-home");
      fs.symlinkSync(os.homedir(), homeLink);
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", homeLink), {
        code: "EBADHOME",
      });
    });

    it("refuses a relative path, a missing path and a file", () => {
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", "rel"), /absolute path/);
      assert.throws(
        () => envSettings.validateHomeDir("CODEX_HOME", path.join(ROOT, "nope")),
        /does not exist/
      );
      const f = path.join(ROOT, "a-file");
      fs.writeFileSync(f, "");
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", f), /Not a directory/);
    });

    it("returns the normalized absolute path, trimmed", () => {
      const d = dir();
      assert.equal(envSettings.validateHomeDir("CODEX_HOME", ` ${d}/./ `), d);
    });

    it("refuses control characters with INVALID_PATH", () => {
      assert.throws(() => envSettings.validateHomeDir("CODEX_HOME", `${dir()}\nX=1`), {
        code: "INVALID_PATH",
      });
    });
  });
});