import { execFile } from "node:child_process";
import { existsSync, mkdtempSync, mkdirSync, rmSync, symlinkSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { promisify } from "node:util";
import { afterEach, expect, test } from "vitest";
import {
  GitWorkspaceRepository,
  WorkspaceRepositoryLock,
  normalizeRepositoryIdentity,
} from "../src/workspaces/git-repository.js";
import type { WorkspaceRegistryConfig } from "../src/workspaces/types.js";

const validYaml = `workspace:
  schema_version: 2
  id: psd-clinical
  name: Policlinico San Donato
  language: it
dwh:
  engine: postgres
  database: postgres
  schema: datawarehouse
  supported_transports: [postgres_direct]
semantic_index:
  vector_store:
    engine: pgvector
    database: postgres
    schema: vectors
    collection: clinical_documents
    dimensions: 768
    distance: cosine
    supported_transports: [pgvector_direct]
  embedding:
    provider: ollama_compatible
    model: nomic-embed-text-v2-moe
    dimensions: 768
llm_policy:
  allowed: [zai/glm-5.2]
`;

const runFile = promisify(execFile);
const temporaryRoots: string[] = [];

afterEach(() => {
  temporaryRoots.splice(0).forEach((root) => rmSync(root, { recursive: true, force: true }));
});

async function git(cwd: string, args: string[]): Promise<void> {
  await runFile("git", args, { cwd });
}

async function temporaryRemote(): Promise<{ root: string; remote: string; source: string; initialCommit: string }> {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-"));
  temporaryRoots.push(root);
  const remote = join(root, "remote.git");
  const source = join(root, "source");
  await git(root, ["init", "--bare", "--initial-branch=main", remote]);
  mkdirSync(source);
  await git(source, ["init", "--initial-branch=main"]);
  await git(source, ["config", "user.name", "Workspace Registry Test"]);
  await git(source, ["config", "user.email", "workspace-registry@example.invalid"]);
  writeFileSync(join(source, "thoth-workspaces.yaml"), "schema_version: 1\nworkspaces: [{id: psd-clinical, name: Policlinico San Donato}, {id: research, name: Policlinico San Donato}]\n");
  mkdirSync(join(source, "psd-clinical"), { recursive: true });
  mkdirSync(join(source, "research"), { recursive: true });
  writeFileSync(join(source, "psd-clinical", "workspace.yaml"), validYaml);
  writeFileSync(join(source, "research", "workspace.yaml"), validYaml
    .replace("id: psd-clinical", "id: research"));
  mkdirSync(join(source, "research", "evidence"), { recursive: true });
  mkdirSync(join(source, "other", "evidence"), { recursive: true });
  mkdirSync(join(source, "blob"), { recursive: true });
  mkdirSync(join(source, "link"), { recursive: true });
  writeFileSync(join(source, "research", "evidence", "guide.md"), "guide v1\n");
  writeFileSync(join(source, "other", "evidence", "other.md"), "other\n");
  writeFileSync(join(source, "blob", "evidence"), "not a tree\n");
  symlinkSync("../research/evidence", join(source, "link", "evidence"));
  symlinkSync("guide.md", join(source, "research", "evidence", "nested-link"));
  await git(source, ["add", "-A"]);
  await git(source, ["commit", "-m", "Initial workspace"]);
  await git(source, ["remote", "add", "origin", remote]);
  await git(source, ["push", "origin", "main"]);
  const { stdout } = await runFile("git", ["rev-parse", "HEAD"], { cwd: source });
  return { root, remote, source, initialCommit: stdout.trim() };
}

function config(root: string, remoteUrl: string): WorkspaceRegistryConfig {
  return {
    root,
    remoteUrl,
    branch: "main",
    gitAuthorName: "Workspace Registry Test",
    gitAuthorEmail: "workspace-registry@example.invalid",
    installationId: "test",
    secretRoots: [],
    maxImportBytes: 1024,
    maxImportEntries: 1,
  };
}

test("does not expose repository mutation or publication operations", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));

  expect(repository).not.toHaveProperty("createRegistryFile");
  expect(repository).not.toHaveProperty("writeRegistryFile");
  expect(repository).not.toHaveProperty("removeRegistryFile");
  expect(repository).not.toHaveProperty("commitAndPush");
});

test.each([
  ["https://github.com/aritmolab/workspaces.git", {
    host: "github.com", repository: "aritmolab/workspaces", transport: "https",
  }],
  ["ssh://git@gitlab.example.org/clinical/workspaces.git", {
    host: "gitlab.example.org", repository: "clinical/workspaces", transport: "ssh",
  }],
  ["git@gitea.example.org:clinical/workspaces.git", {
    host: "gitea.example.org", repository: "clinical/workspaces", transport: "ssh",
  }],
] as const)("normalizes the safe repository identity for %s", (remote, expected) => {
  expect(normalizeRepositoryIdentity(remote)).toEqual(expected);
});

test.each([
  "https://user:secret@github.com/aritmolab/workspaces.git",
  "https://github.com/aritmolab/workspaces.git?token=secret",
  "ssh://git:secret@gitlab.example.org/clinical/workspaces.git",
])("rejects a remote that could expose embedded credentials: %s", (remote) => {
  expect(() => normalizeRepositoryIdentity(remote)).toThrow("Workspace Git remote is invalid");
});

test("bootstraps a persistent checkout from a local bare repository", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));

  const status = await repository.bootstrap();

  expect(status).toMatchObject({
    branch: "main",
    head: fixture.initialCommit,
    ahead: 0,
    behind: 0,
    degraded: false,
  });
});

test("accepts only a tree at the declared Evidence root for the requested revision", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();

  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "research/evidence",
  )).resolves.toBeUndefined();
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "missing/evidence",
  )).rejects.toMatchObject({ code: "workspace_invalid" });
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "blob/evidence",
  )).rejects.toMatchObject({ code: "workspace_invalid" });
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "link/evidence",
  )).rejects.toMatchObject({ code: "workspace_invalid" });
});

test("redacts Git failures while checking an Evidence tree", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();
  rmSync(repository.repoPath, { recursive: true, force: true });

  const error = await repository.assertTreeAtRevision(
    fixture.initialCommit,
    "research/evidence",
  ).catch((failure: unknown) => failure);
  expect(error).toMatchObject({ code: "git_unavailable", message: "Workspace Git operation failed" });
  expect((error as Error).message).not.toContain(fixture.root);
});

test("classifies repository corruption as unavailable rather than invalid Evidence", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();
  rmSync(join(repository.repoPath, ".git", "objects"), { recursive: true, force: true });

  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "research/evidence",
  )).rejects.toMatchObject({ code: "git_unavailable", message: "Workspace Git operation failed" });
});

test("binds Evidence tree validation to old and new content-only commits", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();
  writeFileSync(join(fixture.source, "research", "evidence", "guide.md"), "guide v2\n");
  await git(fixture.source, ["add", "research/evidence/guide.md"]);
  await git(fixture.source, ["commit", "-m", "Update Evidence content"]);
  await git(fixture.source, ["push", "origin", "main"]);
  const { stdout } = await runFile("git", ["rev-parse", "HEAD"], { cwd: fixture.source });
  const newCommit = stdout.trim();
  await repository.pull();
  const oldTree = (await runFile("git", ["rev-parse", `${fixture.initialCommit}:research/evidence`], {
    cwd: fixture.source,
  })).stdout.trim();
  const newTree = (await runFile("git", ["rev-parse", `${newCommit}:research/evidence`], {
    cwd: fixture.source,
  })).stdout.trim();

  expect(newTree).not.toBe(oldTree);
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "research/evidence",
  )).resolves.toBeUndefined();
  await expect(repository.assertTreeAtRevision(
    newCommit,
    "research/evidence",
  )).resolves.toBeUndefined();
});

test("defers nested Evidence symlink containment to P6", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();

  // Task 2 validates only the declared root object. Recursive containment remains a P6 boundary.
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    "research/evidence",
  )).resolves.toBeUndefined();
});

test("rejects malformed revisions and shell-like paths without executing them", async () => {
  const fixture = await temporaryRemote();
  const repository = new GitWorkspaceRepository(config(join(fixture.root, "registry"), fixture.remote));
  await repository.bootstrap();
  const marker = join(fixture.root, "shell-marker");

  await expect(repository.assertTreeAtRevision(
    "HEAD",
    "research/evidence",
  )).rejects.toMatchObject({ code: "workspace_invalid" });
  await expect(repository.assertTreeAtRevision(
    fixture.initialCommit,
    `research/evidence;touch ${marker}`,
  )).rejects.toMatchObject({ code: "workspace_invalid" });
  expect(existsSync(marker)).toBe(false);
});

test("redacts failed Git checkout details behind a stable error code", async () => {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-missing-"));
  temporaryRoots.push(root);
  const remote = join(root, "missing.git");
  const repository = new GitWorkspaceRepository(config(join(root, "registry"), remote));

  const error = await repository.bootstrap().catch((error: unknown) => error);
  expect(error).toMatchObject({
    code: "git_unavailable",
    message: "Workspace Git operation failed",
  });
  expect((error as Error).message).not.toContain(remote);
});

test("maps registry-layout failures to a stable redacted error", async () => {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-layout-"));
  temporaryRoots.push(root);
  const file = join(root, "not-a-directory");
  writeFileSync(file, "occupied");
  const repository = new GitWorkspaceRepository(config(file, join(root, "remote.git")));

  const error = await repository.bootstrap().catch((error: unknown) => error);

  expect(error).toMatchObject({
    code: "git_unavailable",
    message: "Workspace registry storage is unavailable",
  });
  expect((error as Error).message).not.toContain(file);
});

test("maps lock filesystem failures to a stable redacted error", async () => {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-lock-"));
  temporaryRoots.push(root);
  const file = join(root, "not-a-directory");
  writeFileSync(file, "occupied");
  const lock = new WorkspaceRepositoryLock(file);

  const error = await lock.run(async () => undefined).catch((error: unknown) => error);

  expect(error).toMatchObject({
    code: "git_unavailable",
    message: "Workspace registry lock is unavailable",
  });
  expect((error as Error).message).not.toContain(file);
});

test("releases its queue after a malformed lock failure so a later attempt can acquire", async () => {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-queue-"));
  temporaryRoots.push(root);
  const locks = join(root, "locks");
  mkdirSync(join(locks, "repository.lock"), { recursive: true });
  const lock = new WorkspaceRepositoryLock(locks);

  await expect(lock.run(async () => "unreachable")).rejects.toMatchObject({ code: "git_unavailable" });
  rmSync(join(locks, "repository.lock"), { recursive: true, force: true });

  const result = await Promise.race([
    lock.run(async () => "recovered"),
    new Promise<string>((resolve) => setTimeout(() => resolve("timed out"), 2_000)),
  ]);
  expect(result).toBe("recovered");
});

test("parallel contenders recover a stale lock file without overlapping critical sections", async () => {
  const root = mkdtempSync(join(tmpdir(), "thoth-workspace-git-contenders-"));
  temporaryRoots.push(root);
  const locks = join(root, "locks");
  mkdirSync(locks);
  writeFileSync(join(locks, "repository.lock"), JSON.stringify({ pid: 999_999_999 }));
  const first = new WorkspaceRepositoryLock(locks);
  const second = new WorkspaceRepositoryLock(locks);
  let active = 0;
  let maximum = 0;
  const critical = async () => {
    active += 1;
    maximum = Math.max(maximum, active);
    await new Promise((resolve) => setTimeout(resolve, 25));
    active -= 1;
  };

  const results = await Promise.allSettled([first.run(critical), second.run(critical)]);

  expect(results.filter((result) => result.status === "fulfilled")).toHaveLength(1);
  expect(results.filter((result) => result.status === "rejected")).toHaveLength(1);
  expect(maximum).toBe(1);
});