/**
 * @file Tests for Node.js project detection and profile scaffolding
 * (server/lib/lane-detect.js): layout precedence, script selection, the
 * shell-identifier validator, scaffold output, and the profile checker.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

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

const SUITE_ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "ccam-detect-"));
// Must be set before the first require of anything that transitively loads
// server/lib/secrets.js (lane-detect.js does, for checkProfile) — SECRETS_PATH
// is bound once at that module's first load, and without this a test run on a
// machine with a real ~/.ccam/secrets.env would read that file instead of a
// deterministic, isolated one.
process.env.CCAM_SECRETS_PATH = path.join(SUITE_ROOT, "secrets.env");
process.env.DASHBOARD_DB_PATH = path.join(SUITE_ROOT, "dashboard.db");
process.env.LANES_ROOT = path.join(SUITE_ROOT, "lanes");
after(() => fs.rmSync(SUITE_ROOT, { recursive: true, force: true }));

const detect = require("../lib/lane-detect");

let repoSeq = 0;
function makeRepo() {
  repoSeq += 1;
  const dir = path.join(SUITE_ROOT, `repo-${repoSeq}`);
  fs.mkdirSync(dir, { recursive: true });
  return dir;
}

function writePkg(dir, scripts) {
  fs.mkdirSync(dir, { recursive: true });
  fs.writeFileSync(path.join(dir, "package.json"), JSON.stringify({ scripts }, null, 2));
}

describe("detectNode: layout", () => {
  it("returns null when nothing is detected", () => {
    const repo = makeRepo();
    assert.equal(detect.detectNode(repo), null);
  });

  it("detects single-service from a root package.json", () => {
    const repo = makeRepo();
    writePkg(repo, { start: "node index.js" });
    const facts = detect.detectNode(repo);
    assert.equal(facts.layout, "single-service");
    assert.equal(facts.services.app.script, "start");
  });

  it("prefers monorepo when both backend/ and frontend/ package.json exist, even with a root one too", () => {
    const repo = makeRepo();
    writePkg(repo, { start: "node root.js" });
    writePkg(path.join(repo, "backend"), { start: "node server.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite" });
    const facts = detect.detectNode(repo);
    assert.equal(facts.layout, "monorepo");
    assert.equal(facts.services.backend.script, "start");
    assert.equal(facts.services.frontend.script, "dev");
  });

  it("does not detect a backend/ with no matching frontend/", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node server.js" });
    assert.equal(detect.detectNode(repo), null);
  });
});

describe("detectNode: script selection", () => {
  it("backend prefers start over dev", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node a.js", dev: "node b.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite" });
    assert.equal(detect.detectNode(repo).services.backend.script, "start");
  });

  it("frontend prefers preview over dev", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node a.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite", preview: "vite preview" });
    assert.equal(detect.detectNode(repo).services.frontend.script, "preview");
  });

  it("falls back to null (not a guess) when no candidate script exists", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { test: "jest" });
    writePkg(path.join(repo, "frontend"), { build: "vite build" });
    const facts = detect.detectNode(repo);
    assert.equal(facts.services.backend.script, null);
    assert.equal(facts.services.frontend.script, null);
  });
});

describe("IDENTIFIER_RE", () => {
  it("accepts plain identifiers", () => {
    for (const ok of ["start", "dev:watch", "build.prod", "api-server"]) {
      assert.ok(detect.IDENTIFIER_RE.test(ok), ok);
    }
  });

  it("rejects shell metacharacters", () => {
    for (const bad of ["start; rm -rf /", "$(id)", "a b", "a|b", "a`b`"]) {
      assert.ok(!detect.IDENTIFIER_RE.test(bad), bad);
    }
  });
});

function writeCompose(repo, servicesYaml) {
  fs.writeFileSync(path.join(repo, "docker-compose.yml"), `services:\n${servicesYaml}\n`);
}

describe("detectNode: database + Redis + env wiring", () => {
  it("detects a postgres service in docker-compose.yml", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node server.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite" });
    writeCompose(repo, "  postgres:\n    image: postgres:16\n");
    const facts = detect.detectNode(repo);
    assert.equal(facts.database.dbKind, "postgres");
    assert.equal(facts.database.dbService, "postgres");
    assert.match(facts.database.dbPrefix, /_l$/);
    assert.equal(facts.redis, false);
  });

  it("detects redis independently of postgres", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node server.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite" });
    writeCompose(repo, "  cache_redis:\n    image: redis:7\n");
    const facts = detect.detectNode(repo);
    assert.equal(facts.database, null);
    assert.equal(facts.redis, true);
  });

  it("finds no database when there is no docker-compose.yml", () => {
    const repo = makeRepo();
    writePkg(repo, { start: "node index.js" });
    const facts = detect.detectNode(repo);
    assert.equal(facts.database, null);
    assert.equal(facts.redis, false);
    assert.equal(facts.env, null);
  });

  it("wires ENV_REWRITE when a database is found and backend/.env.example exists", () => {
    const repo = makeRepo();
    writePkg(path.join(repo, "backend"), { start: "node server.js" });
    writePkg(path.join(repo, "frontend"), { dev: "vite" });
    writeCompose(repo, "  postgres:\n    image: postgres:16\n  redis:\n    image: redis:7\n");
    fs.writeFileSync(path.join(repo, "backend", ".env.example"), "FOO=bar\n");
    const facts = detect.detectNode(repo);
    assert.equal(facts.env.file, "backend/.env");
    assert.equal(facts.env.source, "backend/.env.example");
    assert.equal(facts.env.fromExample, true);
    assert.deepEqual(facts.env.rewrite, ["DATABASE_URL", "REDIS_URL"]);
  });

  it("leaves env null when a database is found but there is no .env or .env.example", () => {
    const repo = makeRepo();
    writePkg(repo, { start: "node index.js" });
    writeCompose(repo, "  postgres:\n    image: postgres:16\n");
    assert.equal(detect.detectNode(repo).env, null);
  });

  it("rejects a docker-compose service name that fails the shell-identifier check", () => {
    const repo = makeRepo();
    writePkg(repo, { start: "node index.js" });
    writeCompose(repo, '  "postgres; rm -rf /":\n    image: postgres:16\n');
    assert.equal(detect.detectNode(repo).database, null);
  });
});