/**
 * @file Tests for AgentHub's own git credential store and the credential
 * helper that hands it to git: save/list/remove at 0600, a list that never
 * carries the secret, auth-failure detection, and a REAL `git credential fill`
 * run through the helper — stored and use-once.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

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

const ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "git-creds-"));
process.env.CLAUDE_HOME = path.join(ROOT, ".claude");

const creds = require("../lib/git-credentials");

function fill(dir, cfg, env = {}) {
  // Exactly what git-ops passes, then git's own credential lookup.
  const out = execFileSync("git", [...cfg.args, "credential", "fill"], {
    cwd: dir,
    input: "protocol=https\nhost=git.example.test\n\n",
    env: { ...process.env, GIT_TERMINAL_PROMPT: "0", ...cfg.env, ...env },
    encoding: "utf8",
  });
  return Object.fromEntries(
    out
      .trim()
      .split("\n")
      .map((l) => [l.slice(0, l.indexOf("=")), l.slice(l.indexOf("=") + 1)])
  );
}

beforeEach(() => fs.rmSync(path.join(ROOT, ".claude"), { recursive: true, force: true }));

describe("git credential store", () => {
  it("saves one record per protocol+host at 0600 and never lists the secret", () => {
    creds.save({ protocol: "https", host: "Git.Example.Test", username: "a", password: "t1" });
    creds.save({ protocol: "https", host: "git.example.test", username: "b", password: "t2" });
    const list = creds.list();
    assert.equal(list.length, 1);
    assert.equal(list[0].host, "git.example.test");
    assert.equal(list[0].username, "b");
    assert.equal(list[0].hasToken, true);
    assert.ok(!JSON.stringify(list).includes("t2"));
    assert.equal(fs.statSync(creds.credentialsFile()).mode & 0o777, 0o600);
    assert.equal(creds.remove("https", "git.example.test"), true);
    assert.deepEqual(creds.list(), []);
  });

  it("refuses a host that is not a host", () => {
    for (const host of ["", "a/b", "x y", "../etc", "h\nost"]) {
      assert.throws(() => creds.save({ protocol: "https", host, username: "u", password: "p" }), {
        code: "EBADHOST",
      });
    }
    assert.throws(() => creds.save({ protocol: "ssh", host: "h", username: "u", password: "p" }), {
      code: "EBADHOST",
    });
  });

  it("recognises git's auth failures and names the host", () => {
    assert.deepEqual(
      creds.authFailure(
        "fatal: could not read Username for 'https://git.smartgift.io.vn': terminal prompts disabled"
      ),
      { protocol: "https", host: "git.smartgift.io.vn" }
    );
    assert.deepEqual(
      creds.authFailure(
        "remote: Invalid username or password.\nfatal: Authentication failed for 'http://h.local:3000/o/r.git/'"
      ),
      { protocol: "http", host: "h.local:3000" }
    );
    assert.equal(creds.authFailure("! [rejected] main -> main (fetch first)"), null);
  });
});

describe("git credential helper, through real git", () => {
  const repo = fs.mkdtempSync(path.join(ROOT, "repo-"));
  execFileSync("git", ["init", "-q", repo]);
  execFileSync("git", ["-C", repo, "remote", "add", "origin", "https://git.example.test/o/r.git"]);

  it("answers from the store, and only our helper is asked", async () => {
    creds.save({ protocol: "https", host: "git.example.test", username: "u1", password: "stored" });
    const cfg = await creds.gitConfigFor(repo);
    assert.equal(cfg.args[1], "credential.helper=");
    const got = fill(repo, cfg);
    assert.equal(got.username, "u1");
    assert.equal(got.password, "stored");
    assert.ok(!cfg.args.join(" ").includes("stored"), "secret must not reach argv");
  });

  it("prefers a use-once credential, which never touches the store", async () => {
    creds.save({ protocol: "https", host: "git.example.test", username: "u1", password: "stored" });
    const once = { protocol: "https", host: "git.example.test", username: "u2", password: "once" };
    const cfg = await creds.gitConfigFor(repo, once);
    const got = fill(repo, cfg);
    assert.equal(got.password, "once");
    assert.equal(creds.list()[0].username, "u1");
    assert.ok(!cfg.args.join(" ").includes("once"));
  });

  it("changes nothing when AgentHub holds nothing for the repo's hosts", async () => {
    const cfg = await creds.gitConfigFor(repo);
    assert.deepEqual(cfg, { args: [], env: {} });
  });

  it("refuses a use-once credential for a host the repo does not use", async () => {
    await assert.rejects(
      creds.gitConfigFor(repo, {
        protocol: "https",
        host: "evil.test",
        username: "u",
        password: "p",
      }),
      { code: "EBADHOST" }
    );
  });
});