/**
 * @file Tests for codex-discovery.js: read-only discovery of Codex config
 * surfaces (skills, agents, rules, memory, config) across the user (CODEX_HOME)
 * and project (<cwd>/.codex) scopes.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const fs = require("node:fs");
const path = require("node:path");
const os = require("node:os");

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

function write(file, content) {
  fs.mkdirSync(path.dirname(file), { recursive: true });
  fs.writeFileSync(file, content);
}

describe("codex-discovery", () => {
  let TMP;
  let REPO;
  let prevCodexHome;
  let cx;

  before(() => {
    prevCodexHome = process.env.CODEX_HOME;
    TMP = fs.mkdtempSync(path.join(os.tmpdir(), "codex-disc-"));
    REPO = fs.mkdtempSync(path.join(os.tmpdir(), "codex-disc-repo-"));
    process.env.CODEX_HOME = TMP;
    delete require.cache[require.resolve("../lib/codex-home")];
    delete require.cache[require.resolve("../lib/codex-discovery")];
    cx = require("../lib/codex-discovery");
  });

  after(() => {
    if (prevCodexHome === undefined) delete process.env.CODEX_HOME;
    else process.env.CODEX_HOME = prevCodexHome;
    fs.rmSync(TMP, { recursive: true, force: true });
    fs.rmSync(REPO, { recursive: true, force: true });
  });

  it("reads a user skill and a project skill into one scoped list", () => {
    write(
      path.join(TMP, "skills", "release-guard", "SKILL.md"),
      "---\nname: release-guard\n---\nbody"
    );
    write(
      path.join(REPO, ".codex", "skills", "onboarding", "SKILL.md"),
      "---\nname: onboarding\n---\nb"
    );

    const rows = cx.readSkills({ cwd: REPO });
    assert.deepEqual(rows.map((r) => [r.scope, r.name]).sort(), [
      ["project", "onboarding"],
      ["user", "release-guard"],
    ]);
    assert.equal(rows.find((r) => r.name === "release-guard").frontmatter.name, "release-guard");
  });

  it("pulls an agent's identity out of its TOML without a TOML parser", () => {
    write(
      path.join(REPO, ".codex", "agents", "reviewer.toml"),
      'name = "reviewer"\ndescription = "Read-only review agent."\nmodel = "gpt-5.4"\n' +
        'developer_instructions = """\nmulti\nline\n"""\n'
    );

    const [agent] = cx.readAgents({ cwd: REPO, scope: "project" });
    assert.equal(agent.meta.name, "reviewer");
    assert.equal(agent.meta.description, "Read-only review agent.");
    assert.equal(agent.meta.model, "gpt-5.4");
  });

  it("does not mistake a key inside a triple-quoted block for a top-level field", () => {
    const meta = cx.readTomlMeta(
      'name = "implementer"\n' +
        'sandbox_mode = "workspace-write"\n' +
        'developer_instructions = """\n' +
        'model = "not-a-real-field"\n' +
        '"""\n' +
        'model = "gpt-5.3-codex-spark"\n'
    );
    assert.equal(meta.name, "implementer");
    assert.equal(meta.sandbox_mode, "workspace-write");
    assert.equal(meta.model, "gpt-5.3-codex-spark");
  });

  it("keeps a field with a trailing inline comment, and keeps a '#' that is inside the string", () => {
    const meta = cx.readTomlMeta(
      'model = "gpt-5.4"  # default\n' + 'description = "uses # for headings"\n'
    );
    assert.equal(meta.model, "gpt-5.4");
    assert.equal(meta.description, "uses # for headings");
  });

  it("does not let an escaped quote before a real trailing comment truncate the value", () => {
    const meta = cx.readTomlMeta('description = "say \\"hi\\""  # not a comment\n');
    assert.equal(meta.description, 'say \\"hi\\"');
  });

  it("recognises a quote preceded by an escaped backslash as a real terminator", () => {
    const meta = cx.readTomlMeta('path = "path\\\\" # c\n');
    assert.equal(meta.path, "path\\");
  });

  it("keeps counting backslash pairs correctly with four of them before the terminator", () => {
    const meta = cx.readTomlMeta('key = "a\\\\\\\\" # c\n');
    assert.equal(meta.key, "a\\\\");
  });

  it("reads a rule file's preview", () => {
    write(
      path.join(TMP, "rules", "no-force-push.rules"),
      "never force-push main\nask before deleting"
    );
    const [rule] = cx.readRules({ cwd: REPO, scope: "user" });
    assert.equal(rule.name, "no-force-push");
    assert.match(rule.preview, /never force-push main/);
  });

  it("reports a missing AGENTS.md as a row that does not exist, not a gap", () => {
    const rows = cx.readMemory({ cwd: REPO });
    const user = rows.find((r) => r.scope === "user");
    assert.equal(user.exists, false, "the UI offers to create it, so the row must be present");
  });

  it("reads project AGENTS.md from the repo root, not under .codex", () => {
    write(path.join(REPO, "AGENTS.md"), "# Project instructions");
    const rows = cx.readMemory({ cwd: REPO });
    const project = rows.find((r) => r.scope === "project");
    assert.equal(project.exists, true);
    assert.equal(project.file, path.join(REPO, "AGENTS.md"));
  });

  it("reads config.toml content for both scopes", () => {
    write(path.join(TMP, "config.toml"), 'model = "gpt-5.3-codex-spark"\n');
    const rows = cx.readConfig({ cwd: REPO });
    const user = rows.find((r) => r.scope === "user");
    assert.equal(user.exists, true);
    assert.match(user.content, /gpt-5\.3-codex-spark/);
    const project = rows.find((r) => r.scope === "project");
    assert.equal(project.exists, false);
  });

  it("follows a skill directory symlinked in from outside CODEX_HOME — a supported install pattern", () => {
    const outside = fs.mkdtempSync(path.join(os.tmpdir(), "codex-disc-outside-"));
    write(path.join(outside, "SKILL.md"), "---\nname: linked\n---\nbody");
    const linkPath = path.join(TMP, "skills", "linked");
    fs.symlinkSync(outside, linkPath, "dir");

    const [linked] = cx.readSkills({ cwd: REPO, scope: "user" });
    assert.equal(linked.scope, "user");
    assert.equal(linked.name, "linked");
    assert.equal(linked.frontmatter.name, "linked", "frontmatter must be read through the link");
    assert.equal(linked.file, path.join(linkPath, "SKILL.md"));
    fs.rmSync(outside, { recursive: true, force: true });
  });

  it("follows an agent .toml symlinked in from outside CODEX_HOME", () => {
    const outside = fs.mkdtempSync(path.join(os.tmpdir(), "codex-disc-outside-"));
    const realFile = path.join(outside, "reviewer.toml");
    write(realFile, 'name = "reviewer"\n');
    const linkPath = path.join(TMP, "agents", "reviewer.toml");
    fs.mkdirSync(path.dirname(linkPath), { recursive: true });
    fs.symlinkSync(realFile, linkPath, "file");

    const [agent] = cx.readAgents({ cwd: REPO, scope: "user" });
    assert.equal(agent.scope, "user");
    assert.equal(agent.name, "reviewer");
    assert.equal(agent.meta.name, "reviewer", "meta must be read through the link");
    assert.equal(agent.file, linkPath);
    fs.rmSync(outside, { recursive: true, force: true });
  });

  it("summarizes counts and roots in the overview", () => {
    const overview = cx.readOverview({ cwd: REPO });
    assert.equal(overview.roots.projectRoot, REPO);
    assert.ok(overview.counts.skills.user >= 1);
    assert.ok(overview.counts.agents.project >= 1);
  });
});