import assert from "node:assert/strict";
import { mkdir, mkdtemp, readFile, readdir, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import test from "node:test";

import { KeyManager } from "../dist/services/key-manager.js";
import { RepoCounterService } from "../dist/services/repo-counter.js";

async function createHarness(options = {}) {
  const root = await mkdtemp(path.join(os.tmpdir(), "loc-via-git-test-"));
  const fixture = path.join(root, "fixture");
  const bin = path.join(root, "bin");
  const cloneLog = path.join(root, "clone-log");
  await mkdir(fixture, { recursive: true });
  await mkdir(bin);
  await writeFile(path.join(bin, "git"), `#!/usr/bin/env node
import { appendFileSync, cpSync } from "node:fs";
const args = process.argv.slice(2);
const command = args.includes("clone") ? "clone" : args.includes("rev-parse") ? "rev-parse" : "other";
if (command === "clone") {
  appendFileSync(process.env.LOC_TEST_CLONE_LOG, "clone\\n");
  if (process.env.LOC_TEST_HANG === "1") setInterval(() => {}, 1000);
  cpSync(process.env.LOC_TEST_FIXTURE, args.at(-1), { recursive: true });
} else if (command === "rev-parse") {
  process.stdout.write("fixture-commit\\n");
}
`, { mode: 0o755 });

  const config = {
    allowedGitHosts: ["example.test"],
    apiKey: "",
    cacheSweepIntervalMs: 60_000,
    cacheTtlMs: 60_000,
    cloneTimeoutMs: 100,
    defaultSshKeyName: "",
    generateSshKeyIfMissing: false,
    maxConcurrentScans: 2,
    maxFilesPerScan: 100,
    maxFileSizeBytes: 1024 * 1024,
    maxScanBytes: 1024 * 1024,
    port: 3000,
    rateLimitMax: 30,
    rateLimitWindowMs: 60_000,
    sshKeysDir: path.join(root, "keys"),
    tempRoot: path.join(root, "tmp"),
    trustProxy: false,
    ...options
  };
  const originalPath = process.env.PATH;
  process.env.PATH = `${bin}:${originalPath}`;
  process.env.LOC_TEST_FIXTURE = fixture;
  process.env.LOC_TEST_CLONE_LOG = cloneLog;
  const keyManager = new KeyManager(config);
  const service = new RepoCounterService(config, keyManager);
  await keyManager.initialize();
  await service.initialize();

  return {
    cloneLog,
    config,
    fixture,
    root,
    service,
    async cleanup() {
      process.env.PATH = originalPath;
      delete process.env.LOC_TEST_FIXTURE;
      delete process.env.LOC_TEST_CLONE_LOG;
      delete process.env.LOC_TEST_HANG;
      await rm(root, { recursive: true, force: true });
    }
  };
}

test("scans fixture repositories, caches duplicate work, and cleans clone directories", async () => {
  const harness = await createHarness();
  try {
    await writeFile(path.join(harness.fixture, "main.ts"), "const value = 1;\n\nexport { value };\n");
    await mkdir(path.join(harness.fixture, "dist"));
    await writeFile(path.join(harness.fixture, "dist", "bundle.min.js"), "ignored\n");

    const request = { repo: "https://example.test/demo.git", ref: null, sshKey: null };
    const [first, second] = await Promise.all([harness.service.count(request), harness.service.count(request)]);
    const third = await harness.service.count(request);

    assert.equal(first.commit, "fixture-commit");
    assert.equal(second.lineCount, 2);
    assert.equal(third.cached, true);
    assert.equal((await readFile(harness.cloneLog, "utf8")).trim().split("\n").length, 1);
    assert.deepEqual(await readdir(harness.config.tempRoot), []);
  } finally {
    await harness.cleanup();
  }
});

test("rejects oversized files and still removes the temporary clone", async () => {
  const harness = await createHarness({ maxFileSizeBytes: 10 });
  try {
    await writeFile(path.join(harness.fixture, "large.ts"), "export const value = 123;\n");
    await assert.rejects(
      harness.service.count({ repo: "https://example.test/demo.git", ref: null, sshKey: null }),
      { statusCode: 413 }
    );
    assert.deepEqual(await readdir(harness.config.tempRoot), []);
  } finally {
    await harness.cleanup();
  }
});

test("times out stalled clones and rejects unsupported repository URLs", async () => {
  const harness = await createHarness({ cloneTimeoutMs: 50 });
  try {
    process.env.LOC_TEST_HANG = "1";
    await assert.rejects(
      harness.service.count({ repo: "https://example.test/demo.git", ref: null, sshKey: null }),
      { statusCode: 504 }
    );
    await assert.rejects(
      harness.service.count({ repo: "file:///private/repo", ref: null, sshKey: null }),
      { statusCode: 400 }
    );
  } finally {
    await harness.cleanup();
  }
});