import { spawnSync, type SpawnSyncOptionsWithStringEncoding } from "node:child_process";
import { createHash } from "node:crypto";
import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { dirname, join } from "node:path";
import * as age from "age-encryption";
import { createRequire } from "node:module";
import { afterAll, describe, expect, it } from "vitest";
import { parseIdentityFile } from "./restore.js";
import { encryptBundleStream, drainToBuffer } from "./bundle.js";
import type { BundleManifest } from "./archive-index.js";

// The CLI runs as a subprocess so its process.exitCode handling is exercised.
const CLI = join(__dirname, "restore.ts");
const RUN_OPTS: SpawnSyncOptionsWithStringEncoding = { encoding: "utf8", timeout: 60_000 };

// tsx does not export its CLI path; walk up from the resolved package.json
// (pnpm symlinks point into the store, so dist/ sits beside package.json).
const RUNNER = join(
  dirname(createRequire(import.meta.url).resolve("tsx/package.json")),
  "dist", "cli.mjs",
);

const workDirs: string[] = [];
afterAll(async () => {
  await Promise.all(workDirs.map((d) => rm(d, { recursive: true, force: true }).catch(() => undefined)));
});

describe("parseIdentityFile", () => {
  it("reads one AGE-SECRET-KEY per line, ignoring comments and blanks", () => {
    const identity = "AGE-SECRET-KEY-1TESTKEYVALUENOTAREALKEY0000000";
    expect(parseIdentityFile(`# admin key\n\n${identity}\n`)).toEqual([identity]);
    expect(parseIdentityFile("")).toEqual([]);
  });
});

describe("restore CLI (end-to-end)", () => {
  it("round-trips a real bundle: encrypt → decrypt → verify → write", async () => {
    const identity = await age.generateIdentity();
    const recipient = await age.identityToRecipient(identity);

    const png = Uint8Array.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 4, 5, 6]);
    const pdf = new TextEncoder().encode("%PDF-1.7\nrestore me");
    const manifest: BundleManifest = {
      format: "chat-media-archive-bundle",
      version: 1,
      roomId: "!room:example.org",
      workspaceId: "w",
      groupId: "g",
      exportedAt: "2026-01-01T00:00:00.000Z",
      objectKey: null,
      recipients: [recipient],
      fileCount: 2,
      totalBytes: png.byteLength + pdf.byteLength,
      files: [
        {
          eventId: "$e1",
          mxcUri: "mxc://example.org/a",
          originalName: "cat.png",
          safeName: "cat.png",
          mime: "image/png",
          mimeClass: "image",
          byteSize: png.byteLength,
          sha256: createHash("sha256").update(png).digest("hex"),
          sender: "@alice:example.org",
          createdAt: "2026-01-02T00:00:00.000Z",
          ocisResourceId: "ocis-1",
          available: true,
        },
        {
          eventId: "$e2",
          mxcUri: "mxc://example.org/b",
          originalName: "doc.pdf",
          safeName: "doc.pdf",
          mime: "application/pdf",
          mimeClass: "document",
          byteSize: pdf.byteLength,
          sha256: createHash("sha256").update(pdf).digest("hex"),
          sender: "@bob:example.org",
          createdAt: "2026-01-03T00:00:00.000Z",
          ocisResourceId: "ocis-2",
          available: true,
        },
      ],
    };

    const dir = await mkdtemp(join(tmpdir(), "restore-cli-"));
    workDirs.push(dir);
    const bundlePath = join(dir, "bundle.tar.zst.age");
    const identityPath = join(dir, "identity.txt");
    const outDir = join(dir, "out");
    await writeFile(identityPath, `# admin\n${identity}\n`);

    const ciphertext = await drainToBuffer(await encryptBundleStream(
      { manifest, payloads: new Map([["files/$e1/cat.png", png], ["files/$e2/doc.pdf", pdf]]) },
      [recipient],
    ));
    await writeFile(bundlePath, ciphertext);
    // sanity: the bundle is ciphertext, not a readable tar
    expect(Buffer.from(ciphertext.subarray(257, 262)).toString("latin1")).not.toBe("ustar");

    const run = spawnSync(process.execPath, [RUNNER, CLI, "--bundle", bundlePath, "--identity", identityPath, "--out", outDir], RUN_OPTS);
    expect(run.stderr).toBe("");
    expect(run.stdout).toContain("2/2 files verified");
    expect(run.status).toBe(0);

    const restoredPng = await readFile(join(outDir, "files", "$e1", "cat.png"));
    expect(new Uint8Array(restoredPng)).toEqual(png);
    const restoredPdf = await readFile(join(outDir, "files", "$e2", "doc.pdf"));
    expect(new Uint8Array(restoredPdf)).toEqual(pdf);
    const manifestOnDisk = JSON.parse(await readFile(join(outDir, "manifest.json"), "utf8")) as BundleManifest;
    expect(manifestOnDisk.files).toHaveLength(2);
  }, 90_000);

  it("fails (non-zero exit) when a payload's sha256 does not match the manifest", async () => {
    const identity = await age.generateIdentity();
    const recipient = await age.identityToRecipient(identity);
    const good = new TextEncoder().encode("good bytes");
    const manifest: BundleManifest = {
      format: "chat-media-archive-bundle",
      version: 1,
      roomId: "!r:x",
      workspaceId: "w",
      groupId: "g",
      exportedAt: new Date(0).toISOString(),
      objectKey: null,
      recipients: [],
      fileCount: 1,
      totalBytes: good.byteLength,
      files: [{
        eventId: "$e1",
        mxcUri: "",
        originalName: "a.txt",
        safeName: "a.txt",
        mime: "text/plain",
        mimeClass: "document",
        byteSize: good.byteLength,
        sha256: createHash("sha256").update("tampered!").digest("hex"),
        sender: "@a:x",
        createdAt: new Date(0).toISOString(),
        ocisResourceId: "r",
        available: true,
      }],
    };
    const dir = await mkdtemp(join(tmpdir(), "restore-bad-"));
    workDirs.push(dir);
    const bundlePath = join(dir, "b.tar.zst.age");
    const identityPath = join(dir, "id.txt");
    await writeFile(identityPath, identity);
    await writeFile(bundlePath, await drainToBuffer(await encryptBundleStream(
      { manifest, payloads: new Map([["files/$e1/a.txt", good]]) },
      [recipient],
    )));
    const run = spawnSync(process.execPath, [RUNNER, CLI, "--bundle", bundlePath, "--identity", identityPath, "--out", join(dir, "out")], RUN_OPTS);
    expect(run.status).toBe(1);
    expect(run.stdout).toContain("failed");
  }, 90_000);
});