/** Trusted Nix build driver. No package-defined build hooks run between generation and witnessing. */
import fs from "node:fs/promises";
import path from "node:path";
import { createHash } from "node:crypto";
import { builtinModules } from "node:module";
import { execFileSync } from "node:child_process";
import { pathToFileURL } from "node:url";
const config = JSON.parse(await fs.readFile(process.argv[2], "utf8"));
const compiler = await import(pathToFileURL(config.compiler));
const plan = JSON.parse(await fs.readFile(config.plan, "utf8"));
const pkg = plan.definition.packages.find((p) => p.revision === config.packageRevisionId);
if (!pkg || compiler.hexDigest(plan.definition) !== plan.digest) throw Error("Invalid checked execution plan/package");
const output = process.env.out;
if (!output) throw Error("Missing Nix output");
const digest = (bytes) => createHash("sha256").update(bytes).digest("hex");
const generatorDigest = digest(await fs.readFile(config.compiler));
const runtime = config.portable
  ? JSON.parse(await fs.readFile(path.join(config.sharedRuntime, "runtime.json"), "utf8"))
  : { files: [] };
const relative = (p) => compiler.artifactPath(p);
const implementations = [];
const generated = new Map();
const recordFile = async (p, mediaType) => {
  const bytes = await fs.readFile(path.join(output, relative(p)));
  return { path: p, digest: digest(bytes), bytes: bytes.length, mediaType };
};
const copyRuntime = async () => {
  await fs.mkdir(path.join(output, "share/quixos/shared"), { recursive: true });
  for (const file of runtime.files) {
    relative(file.path);
    const bytes = await fs.readFile(path.join(config.sharedRuntime, file.path));
    if (bytes.length !== file.bytes || digest(bytes) !== file.digest) throw Error("Shared runtime mismatch");
    await fs.writeFile(path.join(output, "share/quixos/shared", file.path), bytes);
  }
};
await copyRuntime();
const sharedFiles = await Promise.all(
  runtime.files.map((f) => recordFile(`share/quixos/shared/${f.path}`, f.mediaType)),
);
const coreFile = sharedFiles.find((f) => f.path.endsWith("/core.mjs"));
const coreURL = coreFile ? compiler.contentArtifactUrl(coreFile) : null;
const coreServer = path.join(config.sharedRuntime, "core.mjs");
await fs.mkdir(path.join(output, "share/quixos/generated"), { recursive: true });
const portable = config.portable;
if (portable && !/^[$A-Z_a-z][$\w]*$/.test(portable.registryExport))
  throw Error("Registry export must be a JavaScript identifier");
const targets = portable ? [...new Set([...portable.targets, "server"])] : [];
for (const target of targets) {
  if (!["browser", "server"].includes(target)) throw Error(`Unsupported JS build target ${target}`);
  const work = path.resolve(`work-${target}`);
  await fs.cp(config.source, work, { recursive: true, dereference: false });
  const writable = async (directory) => {
    await fs.chmod(directory, 0o755);
    for (const item of await fs.readdir(directory, { withFileTypes: true })) {
      const file = path.join(directory, item.name);
      if (item.isSymbolicLink()) throw Error("Authored package source cannot contain symlinks");
      if (item.isDirectory()) await writable(file);
      else await fs.chmod(file, 0o644);
    }
  };
  await writable(work);
  const modules = path.join(work, "node_modules");
  await fs.mkdir(path.join(modules, "@quixos"), { recursive: true });
  if (config.nodeModules) {
    for (const item of await fs.readdir(config.nodeModules, { withFileTypes: true })) {
      if (item.name === "@quixos") throw Error("Application dependencies cannot substitute the checked SDK");
      await fs.symlink(path.join(config.nodeModules, item.name), path.join(modules, item.name));
    }
  }
  await fs.symlink(config.core, path.join(modules, "@quixos/camino-replica-core"));
  await fs.writeFile(path.join(work, "package.json"), JSON.stringify({ type: "module" }));
  const bindingPath = relative(portable.bindingOutput);
  const source = compiler.generatePortableTypeScriptBindings(plan.definition.bindingSchema, pkg.revision, { target });
  await fs.mkdir(path.dirname(path.join(work, bindingPath)), { recursive: true });
  await fs.writeFile(path.join(work, bindingPath), source);
  generated.set(target, { file: path.join(work, bindingPath), source });
  await fs.writeFile(path.join(output, "share/quixos/generated", `${target}.ts`), source);
  const entry = relative(portable.entry);
  execFileSync(
    config.node,
    [
      config.tsc,
      "--noEmit",
      "--strict",
      "--skipLibCheck",
      "false",
      "--target",
      "es2024",
      "--lib",
      "es2024,dom,esnext.disposable",
      "--module",
      "nodenext",
      "--moduleResolution",
      "nodenext",
      entry,
    ],
    { cwd: work, stdio: "inherit" },
  );
  const bundlePath = `share/quixos/portable/${target}/module.mjs`;
  await fs.mkdir(path.dirname(path.join(output, bundlePath)), { recursive: true });
  const coreImport = target === "browser" ? coreURL : coreServer;
  const metadata = path.join(work, "bundle-meta.json");
  execFileSync(
    config.esbuild,
    [
      entry,
      "--bundle",
      `--platform=${target === "browser" ? "browser" : "node"}`,
      "--format=esm",
      "--target=es2024",
      `--outfile=${path.join(output, bundlePath)}`,
      `--metafile=${metadata}`,
      `--alias:@quixos/camino-replica-core=${coreImport}`,
      `--external:${coreImport}`,
    ],
    { cwd: work, stdio: "inherit" },
  );
  const meta = JSON.parse(await fs.readFile(metadata, "utf8"));
  const built = Object.values(meta.outputs).find((o) => o.entryPoint);
  if (!built?.exports.includes(portable.registryExport)) throw Error("Bundle lacks the declared registry export");
  // Portable modules must contain their ordinary source dependencies and share only the checked SDK.
  if (
    Object.values(meta.outputs).some((o) =>
      o.imports.some(
        (i) =>
          i.external &&
          i.path !== coreImport &&
          !(target === "server" && builtinModules.includes(i.path.replace(/^node:/, ""))),
      ),
    )
  )
    throw Error("Unexpected external import in portable module");
  const exports = pkg.exports
    .filter((e) => e.execution.kind !== "remote" && e.execution.targets.includes(target))
    .map((e) => e.id);
  const body = {
    id: `${target}-module`,
    target,
    compatibility: "quixos-js-module-v1",
    path: bundlePath,
    ports: "quixos-transaction-ports-v1",
    registryExport: portable.registryExport,
    exports,
    files: [await recordFile(bundlePath, "text/javascript"), ...sharedFiles],
  };
  implementations.push({ ...body, contentDigest: compiler.implementationDigest(body) });
}
await fs.mkdir(path.join(output, "bin"), { recursive: true });
await fs.mkdir(path.join(output, "share/quixos/service"), { recursive: true });
let serviceEntry;
if (config.service.entry) {
  if (!/\.m?js$/.test(config.service.entry))
    throw Error("Custom service entry must be JavaScript; use a separate typed/language build before packaging");
  serviceEntry = path.join(config.source, relative(config.service.entry));
} else {
  if (!portable) throw Error("Generated service requires a portable registry");
  if (pkg.exports.some((e) => e.execution.kind === "remote" || !e.execution.targets.includes("server")))
    throw Error("Generated service does not cover every package export; provide a custom service");
  serviceEntry = path.resolve("service-entry.mjs");
  await fs.writeFile(
    serviceEntry,
    `import { ${portable.registryExport} as registry } from ${JSON.stringify(path.join(output, "share/quixos/portable/server/module.mjs"))};\nimport {servePortableRegistry} from ${JSON.stringify(config.serviceAdapter)};\nservePortableRegistry(registry);\n`,
  );
}
const serviceModule = "share/quixos/service/main.mjs";
execFileSync(
  config.esbuild,
  [
    serviceEntry,
    "--bundle",
    "--platform=node",
    "--format=esm",
    "--target=es2024",
    `--external:${coreServer}`,
    `--outfile=${path.join(output, serviceModule)}`,
  ],
  { stdio: "inherit" },
);
await fs.writeFile(
  path.join(output, "bin/service"),
  `#!${config.shell}\nexec ${config.node} ${output}/${serviceModule} "$@"\n`,
  { mode: 0o755 },
);
const serviceBody = {
  id: "service",
  target: "server",
  compatibility: "quixos-service-v1",
  path: "bin/service",
  ports: "quixos-transaction-ports-v1",
  exports: pkg.exports.map((e) => e.id),
  files: [
    await recordFile("bin/service", "text/x-shellscript"),
    await recordFile(serviceModule, "text/javascript"),
    ...sharedFiles,
  ],
};
implementations.unshift({ ...serviceBody, contentDigest: compiler.implementationDigest(serviceBody) });
const manifest = compiler.parsePackageArtifacts({
  schemaVersion: 1,
  packageRevisionId: pkg.revision,
  bindingDigest: pkg.bindingDigest,
  sourceDigest: pkg.sourceDigest,
  versions: plan.definition.versions,
  implementations,
});
for (const { file, source } of generated.values())
  if ((await fs.readFile(file, "utf8")) !== source) throw Error("Generated bindings changed during build");
const { receipt, sources } = compiler.expectedArtifactReceipt(plan, manifest, generatorDigest);
for (const [file, bytes] of sources)
  if (!Buffer.from(bytes).equals(await fs.readFile(path.join(output, file))))
    throw Error("Receipt generation differs from compiled bindings");
await fs.writeFile(path.join(output, "share/quixos/package-artifacts.json"), JSON.stringify(manifest, null, 2));
await fs.writeFile(path.join(output, "share/quixos/build-receipt.json"), JSON.stringify(receipt, null, 2));