#!/usr/bin/env node
/* deno-lint-ignore-file */
/*
 Automatic test matrix for project root detection.
 Creates temporary fixtures for various ecosystems and validates findProjectRoot().
 No external options or flags required. Safe to run multiple times.
*/

const os = require("node:os");
const path = require("node:path");
const fs = require("fs-extra");
const { promisify } = require("node:util");
const { execFile } = require("node:child_process");
const process = require("node:process");
const execFileAsync = promisify(execFile);

const { findProjectRoot } = require("./projectRoot.js");

async function cmdAvailable(cmd) {
  try {
    await execFileAsync(cmd, ["--version"], { timeout: 500, windowsHide: true });
    return true;
  } catch {
    return false;
  }

async function testSvnMarker() {
  const root = await mkTmpDir("svn");
  const nested = path.join(root, "proj", "code");
  await fs.ensureDir(nested);
  await fs.ensureDir(path.join(root, ".svn"));
  const found = await findProjectRoot(nested);
  assertEqual(found, root, ".svn marker should be detected");
  return { name: "svn-marker", ok: true };
}

async function testSymlinkStart() {
  const root = await mkTmpDir("symlink-start");
  const nested = path.join(root, "a", "b");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, ".project-root"), "\n");
  const tmp = await mkTmpDir("symlink-tmp");
  const link = path.join(tmp, "link-to-b");
  try {
    await fs.symlink(nested, link);
  } catch {
    // symlink may not be permitted on some systems; skip
    return { name: "symlink-start", ok: true, skipped: true };
  }
  const found = await findProjectRoot(link);
  assertEqual(found, root, "should resolve symlinked start to real root");
  return { name: "symlink-start", ok: true };
}

async function testSubmoduleLikeInnerGitFile() {
  const root = await mkTmpDir("submodule-like");
  const mid = path.join(root, "mid");
  const leaf = path.join(mid, "leaf");
  await fs.ensureDir(leaf);
  // outer repo
  await fs.ensureDir(path.join(root, ".git"));
  // inner submodule-like .git file
  await fs.writeFile(path.join(mid, ".git"), "gitdir: ../.git/modules/mid\n");
  const found = await findProjectRoot(leaf);
  assertEqual(found, root, "outermost .git should win on tie weight");
  return { name: "submodule-like-gitfile", ok: true };
}
}

async function mkTmpDir(name) {
  const base = await fs.realpath(os.tmpdir());
  const dir = await fs.mkdtemp(path.join(base, `flattener-${name}-`));
  return dir;
}

function assertEqual(actual, expected, msg) {
  if (actual !== expected) {
    throw new Error(`${msg}: expected=\"${expected}\" actual=\"${actual}\"`);
  }
}

async function testSentinel() {
  const root = await mkTmpDir("sentinel");
  const nested = path.join(root, "a", "b", "c");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, ".project-root"), "\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "sentinel .project-root should win");
  return { name: "sentinel", ok: true };
}

async function testOtherSentinels() {
  const root = await mkTmpDir("other-sentinels");
  const nested = path.join(root, "x", "y");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, ".workspace-root"), "\n");
  const found1 = await findProjectRoot(nested);
  assertEqual(found1, root, "sentinel .workspace-root should win");

  await fs.remove(path.join(root, ".workspace-root"));
  await fs.writeFile(path.join(root, ".repo-root"), "\n");
  const found2 = await findProjectRoot(nested);
  assertEqual(found2, root, "sentinel .repo-root should win");
  return { name: "other-sentinels", ok: true };
}

async function testGitCliAndMarker() {
  const hasGit = await cmdAvailable("git");
  if (!hasGit) return { name: "git-cli", ok: true, skipped: true };

  const root = await mkTmpDir("git");
  const nested = path.join(root, "pkg", "src");
  await fs.ensureDir(nested);
  await execFileAsync("git", ["init"], { cwd: root, timeout: 2000 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "git toplevel should be detected");
  return { name: "git-cli", ok: true };
}

async function testHgMarkerOrCli() {
  // Prefer simple marker test to avoid requiring Mercurial install
  const root = await mkTmpDir("hg");
  const nested = path.join(root, "lib");
  await fs.ensureDir(nested);
  await fs.ensureDir(path.join(root, ".hg"));
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, ".hg marker should be detected");
  return { name: "hg-marker", ok: true };
}

async function testWorkspacePnpm() {
  const root = await mkTmpDir("pnpm-workspace");
  const pkgA = path.join(root, "packages", "a");
  await fs.ensureDir(pkgA);
  await fs.writeFile(path.join(root, "pnpm-workspace.yaml"), "packages:\n  - packages/*\n");
  const found = await findProjectRoot(pkgA);
  await assertEqual(found, root, "pnpm-workspace.yaml should be detected");
  return { name: "pnpm-workspace", ok: true };
}

async function testPackageJsonWorkspaces() {
  const root = await mkTmpDir("package-workspaces");
  const pkgA = path.join(root, "packages", "a");
  await fs.ensureDir(pkgA);
  await fs.writeJson(path.join(root, "package.json"), { private: true, workspaces: ["packages/*"] }, { spaces: 2 });
  const found = await findProjectRoot(pkgA);
  await assertEqual(found, root, "package.json workspaces should be detected");
  return { name: "package.json-workspaces", ok: true };
}

async function testLockfiles() {
  const root = await mkTmpDir("lockfiles");
  const nested = path.join(root, "src");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "yarn.lock"), "\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "yarn.lock should be detected");
  return { name: "lockfiles", ok: true };
}

async function testLanguageConfigs() {
  const root = await mkTmpDir("lang-configs");
  const nested = path.join(root, "x", "y");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "pyproject.toml"), "[tool.poetry]\nname='tmp'\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "pyproject.toml should be detected");
  return { name: "language-configs", ok: true };
}

async function testPreferOuterOnTie() {
  const root = await mkTmpDir("tie");
  const mid = path.join(root, "mid");
  const leaf = path.join(mid, "leaf");
  await fs.ensureDir(leaf);
  // same weight marker at two levels
  await fs.writeFile(path.join(root, "requirements.txt"), "\n");
  await fs.writeFile(path.join(mid, "requirements.txt"), "\n");
  const found = await findProjectRoot(leaf);
  await assertEqual(found, root, "outermost directory should win on equal weight");
  return { name: "prefer-outermost-tie", ok: true };
}

// Additional coverage: Bazel, Nx/Turbo/Rush, Go workspaces, Deno, Java/Scala, PHP, Rust, Nix, Changesets, env markers,
// and priority interaction between package.json and lockfiles.

async function testBazelWorkspace() {
  const root = await mkTmpDir("bazel");
  const nested = path.join(root, "apps", "svc");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "WORKSPACE"), "workspace(name=\"tmp\")\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "Bazel WORKSPACE should be detected");
  return { name: "bazel-workspace", ok: true };
}

async function testNx() {
  const root = await mkTmpDir("nx");
  const nested = path.join(root, "apps", "web");
  await fs.ensureDir(nested);
  await fs.writeJson(path.join(root, "nx.json"), { npmScope: "tmp" }, { spaces: 2 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "nx.json should be detected");
  return { name: "nx", ok: true };
}

async function testTurbo() {
  const root = await mkTmpDir("turbo");
  const nested = path.join(root, "packages", "x");
  await fs.ensureDir(nested);
  await fs.writeJson(path.join(root, "turbo.json"), { pipeline: {} }, { spaces: 2 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "turbo.json should be detected");
  return { name: "turbo", ok: true };
}

async function testRush() {
  const root = await mkTmpDir("rush");
  const nested = path.join(root, "apps", "a");
  await fs.ensureDir(nested);
  await fs.writeJson(path.join(root, "rush.json"), { projectFolderMinDepth: 1 }, { spaces: 2 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "rush.json should be detected");
  return { name: "rush", ok: true };
}

async function testGoWorkAndMod() {
  const root = await mkTmpDir("gowork");
  const mod = path.join(root, "modA");
  const nested = path.join(mod, "pkg");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "go.work"), "go 1.22\nuse ./modA\n");
  await fs.writeFile(path.join(mod, "go.mod"), "module example.com/a\ngo 1.22\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "go.work should define the workspace root");
  return { name: "go-work", ok: true };
}

async function testDenoJson() {
  const root = await mkTmpDir("deno");
  const nested = path.join(root, "src");
  await fs.ensureDir(nested);
  await fs.writeJson(path.join(root, "deno.json"), { tasks: {} }, { spaces: 2 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "deno.json should be detected");
  return { name: "deno-json", ok: true };
}

async function testGradleSettings() {
  const root = await mkTmpDir("gradle");
  const nested = path.join(root, "app");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "settings.gradle"), "rootProject.name='tmp'\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "settings.gradle should be detected");
  return { name: "gradle-settings", ok: true };
}

async function testMavenPom() {
  const root = await mkTmpDir("maven");
  const nested = path.join(root, "module");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "pom.xml"), "<project></project>\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "pom.xml should be detected");
  return { name: "maven-pom", ok: true };
}

async function testSbtBuild() {
  const root = await mkTmpDir("sbt");
  const nested = path.join(root, "sub");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "build.sbt"), "name := \"tmp\"\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "build.sbt should be detected");
  return { name: "sbt-build", ok: true };
}

async function testComposer() {
  const root = await mkTmpDir("composer");
  const nested = path.join(root, "src");
  await fs.ensureDir(nested);
  await fs.writeJson(path.join(root, "composer.json"), { name: "tmp/pkg" }, { spaces: 2 });
  await fs.writeFile(path.join(root, "composer.lock"), "{}\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "composer.{json,lock} should be detected");
  return { name: "composer", ok: true };
}

async function testCargo() {
  const root = await mkTmpDir("cargo");
  const nested = path.join(root, "src");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "Cargo.toml"), "[package]\nname='tmp'\nversion='0.0.0'\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "Cargo.toml should be detected");
  return { name: "cargo", ok: true };
}

async function testNixFlake() {
  const root = await mkTmpDir("nix");
  const nested = path.join(root, "work");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "flake.nix"), "{ }\n");
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, "flake.nix should be detected");
  return { name: "nix-flake", ok: true };
}

async function testChangesetConfig() {
  const root = await mkTmpDir("changeset");
  const nested = path.join(root, "pkg");
  await fs.ensureDir(nested);
  await fs.ensureDir(path.join(root, ".changeset"));
  await fs.writeJson(path.join(root, ".changeset", "config.json"), { $schema: "https://unpkg.com/@changesets/config@2.3.1/schema.json" }, { spaces: 2 });
  const found = await findProjectRoot(nested);
  await assertEqual(found, root, ".changeset/config.json should be detected");
  return { name: "changesets", ok: true };
}

async function testEnvCustomMarker() {
  const root = await mkTmpDir("env-marker");
  const nested = path.join(root, "dir");
  await fs.ensureDir(nested);
  await fs.writeFile(path.join(root, "MY_ROOT"), "\n");
  const prev = process.env.PROJECT_ROOT_MARKERS;
  process.env.PROJECT_ROOT_MARKERS = "MY_ROOT";
  try {
    const found = await findProjectRoot(nested);
    await assertEqual(found, root, "custom env marker should be honored");
  } finally {
    if (prev === undefined) delete process.env.PROJECT_ROOT_MARKERS; else process.env.PROJECT_ROOT_MARKERS = prev;
  }
  return { name: "env-custom-marker", ok: true };
}

async function testPackageLowPriorityVsLock() {
  const root = await mkTmpDir("pkg-vs-lock");
  const nested = path.join(root, "nested");
  await fs.ensureDir(path.join(nested, "deep"));
  await fs.writeJson(path.join(nested, "package.json"), { name: "nested" }, { spaces: 2 });
  await fs.writeFile(path.join(root, "yarn.lock"), "\n");
  const found = await findProjectRoot(path.join(nested, "deep"));
  await assertEqual(found, root, "lockfile at root should outrank nested package.json");
  return { name: "package-vs-lock-priority", ok: true };
}

async function run() {
  const tests = [
    testSentinel,
    testOtherSentinels,
    testGitCliAndMarker,
    testHgMarkerOrCli,
    testWorkspacePnpm,
    testPackageJsonWorkspaces,
    testLockfiles,
    testLanguageConfigs,
    testPreferOuterOnTie,
    testBazelWorkspace,
    testNx,
    testTurbo,
    testRush,
    testGoWorkAndMod,
    testDenoJson,
    testGradleSettings,
    testMavenPom,
    testSbtBuild,
    testComposer,
    testCargo,
    testNixFlake,
    testChangesetConfig,
    testEnvCustomMarker,
    testPackageLowPriorityVsLock,
    testSvnMarker,
    testSymlinkStart,
    testSubmoduleLikeInnerGitFile,
  ];

  const results = [];
  for (const t of tests) {
    try {
      const r = await t();
      results.push({ ...r, ok: true });
      console.log(`✔ ${r.name}${r.skipped ? " (skipped)" : ""}`);
    } catch (err) {
      console.error(`✖ ${t.name}:`, err && err.message ? err.message : err);
      results.push({ name: t.name, ok: false, error: String(err) });
    }
  }

  const failed = results.filter((r) => !r.ok);
  console.log("\nSummary:");
  for (const r of results) {
    console.log(`- ${r.name}: ${r.ok ? "ok" : "FAIL"}${r.skipped ? " (skipped)" : ""}`);
  }

  if (failed.length) {
    process.exitCode = 1;
  }
}

run().catch((e) => {
  console.error("Fatal error:", e);
  process.exit(1);
});