import { execFile } from "node:child_process";
import { mkdtempSync, mkdirSync, readFileSync, rmSync, 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 { WorkspaceRegistry } from "../src/workspaces/registry.js";
import type { WorkspaceRegistryConfig } from "../src/workspaces/types.js";

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<string> {
  const { stdout } = await runFile("git", args, { cwd });
  return stdout.trim();
}

const descriptor = `workspace:
  schema_version: 4
  id: research
  name: Research
  language: en
dwh:
  engine: postgres
  database: analytics
  schema: mart
  supported_transports: [postgres_direct]
evidence:
  source:
    type: filesystem
    uri: research/evidence
`;

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

async function fixture(): Promise<{ root: string; remote: string; commit: string }> {
  const root = mkdtempSync(join(tmpdir(), "thoth-registry-evidence-"));
  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", "Evidence Registry Test"]);
  await git(source, ["config", "user.email", "evidence-registry@example.invalid"]);
  writeFileSync(join(source, "thoth-workspaces.yaml"), "schema_version: 1\nworkspaces:\n  - id: research\n    name: Research\n");
  mkdirSync(join(source, "research", "evidence"), { recursive: true });
  writeFileSync(join(source, "research", "workspace.yaml"), descriptor);
  writeFileSync(join(source, "research", "evidence", "guide.md"), "# guide\n");
  await git(source, ["add", "-A"]);
  await git(source, ["commit", "-m", "initial"]);
  await git(source, ["remote", "add", "origin", remote]);
  await git(source, ["push", "origin", "main"]);
  const commit = await git(source, ["rev-parse", "HEAD"]);
  return { root, remote, commit };
}

test("activation materializes filesystem Evidence and chains its manifest into snapshot.json", async () => {
  const fixtureValue = await fixture();
  const registryRoot = join(fixtureValue.root, "registry");
  const registry = new WorkspaceRegistry(config(registryRoot, fixtureValue.remote));

  await registry.bootstrap();

  const evidence = join(registryRoot, "snapshots", fixtureValue.commit, "research", "evidence");
  const manifestPath = join(registryRoot, "snapshots", fixtureValue.commit, "research", "evidence.manifest.json");
  expect(readFileSync(join(evidence, "guide.md"), "utf8")).toBe("# guide\n");
  const manifest = JSON.parse(readFileSync(manifestPath, "utf8"));
  expect(manifest).toMatchObject({ schemaVersion: 1, workspace: "research", commit: fixtureValue.commit, entryCount: 1 });
  const snapshotManifest = JSON.parse(readFileSync(join(registryRoot, "snapshots", fixtureValue.commit, "snapshot.json"), "utf8"));
  expect(snapshotManifest.files["research/evidence.manifest.json"]).toMatch(/^[0-9a-f]{64}$/);

  // Re-activation verifies the existing materialized root.
  await expect(registry.bootstrap()).resolves.toMatchObject({ degraded: false });
});

test("activation fails closed when the materialized Evidence manifest is tampered", async () => {
  const fixtureValue = await fixture();
  const registryRoot = join(fixtureValue.root, "registry");
  const registry = new WorkspaceRegistry(config(registryRoot, fixtureValue.remote));
  await registry.bootstrap();

  const manifestPath = join(registryRoot, "snapshots", fixtureValue.commit, "research", "evidence.manifest.json");
  writeFileSync(manifestPath, `${JSON.stringify({ schemaVersion: 1, workspace: "research", commit: fixtureValue.commit, tree: "0".repeat(40), entryCount: 0, totalBytes: 0, files: {} })}\n`);

  await expect(registry.bootstrap()).rejects.toMatchObject({ code: "workspace_invalid" });
});