import { installDependencies } from "./install-dependencies.mjs";
import { buildService } from "./build-service.mjs";
import { buildComponents } from "./build-components.mjs";
/** 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 || config.remote
    ? 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;
for (const target of Object.keys(portable?.entries ?? {}))
  if (!["browser", "server"].includes(target)) throw Error(`Unsupported portable entry target ${target}`);
for (const settings of [portable, config.remote].filter(Boolean))
  if (!/^[$A-Z_a-z][$\w]*$/.test(settings.registryExport))
    throw Error("Registry export must be a JavaScript identifier");
const targets = portable ? [...new Set([...portable.targets, "server"])] : [];
const builds = targets.map((target) => ({ target, mode: target, settings: portable }));
if (config.remote) builds.push({ target: "server", mode: "remote", settings: config.remote });
for (const { target, mode, settings } of builds) {
  if (!["browser", "server"].includes(target)) throw Error(`Unsupported JS build target ${target}`);
  const work = path.resolve(`work-${mode}`);
  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 });
  await installDependencies({
    destination: modules,
    application: config.nodeModules,
    selected: { "@quixos/camino-replica-core": config.core },
    reserved: ["@quixos/camino-replica-core", "@quixos/camino-replica-client", "@quixos/camino-replica-engine"],
  });
  const packageFile = path.join(work, "package.json");
  const packageMetadata = await fs.readFile(packageFile, "utf8").then(JSON.parse, (error) => {
    if (error.code === "ENOENT") return {};
    throw error;
  });
  await fs.writeFile(packageFile, JSON.stringify({ ...packageMetadata, type: "module" }));
  const bindingPath = relative(settings.bindingOutput);
  const source =
    mode === "remote"
      ? compiler.generateRemoteTypeScriptBindings(plan.definition.bindingSchema, pkg.revision)
      : 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(mode, { file: path.join(work, bindingPath), source });
  await fs.writeFile(path.join(output, "share/quixos/generated", `${mode}.ts`), source);
  const entry = relative(settings.entries?.[target] ?? settings.entry);
  execFileSync(
    config.node,
    [
      config.tsc,
      "--noEmit",
      "--strict",
      "--skipLibCheck",
      "false",
      "--target",
      "es2024",
      "--lib",
      "es2024,dom,esnext.disposable",
      "--module",
      "nodenext",
      "--moduleResolution",
      "nodenext",
      entry,
    ],
    { cwd: work, stdio: "inherit" },
  );
  const bundlePath =
    mode === "remote" ? "share/quixos/remote/server/module.mjs" : `share/quixos/portable/${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=${target === "browser" ? "browser" : "node"}`,
      "--format=esm",
      "--minify-whitespace",
      "--target=es2024",
      `--outfile=${path.join(output, bundlePath)}`,
      `--metafile=${metadata}`,
      `--alias:@quixos/camino-replica-core=${coreImport}`,
      `--external:${coreImport}`,
    ],
    { cwd: work, stdio: "inherit" },
  );
  const meta = JSON.parse(await fs.readFile(metadata, "utf8"));
  const built = Object.values(meta.outputs).find((o) => o.entryPoint);
  if (!built?.exports.includes(settings.registryExport)) throw Error("Bundle lacks the declared registry export");
  // Portable modules must contain their ordinary source dependencies and share only the checked SDK.
  if (
    Object.values(meta.outputs).some((o) =>
      o.imports.some(
        (i) =>
          i.external &&
          i.path !== coreImport &&
          !(target === "server" && builtinModules.includes(i.path.replace(/^node:/, ""))),
      ),
    )
  )
    throw Error("Unexpected external import in portable module");
  const exports = pkg.exports
    .filter((e) =>
      mode === "remote"
        ? e.execution.kind === "remote"
        : e.execution.kind !== "remote" && e.execution.targets.includes(target),
    )
    .map((e) => e.id);
  const body = {
    id: `${mode}-module`,
    target,
    compatibility: "quixos-js-module-v1",
    path: bundlePath,
    ports: "quixos-transaction-ports-v1",
    registryExport: settings.registryExport,
    exports,
    files: [await recordFile(bundlePath, "text/javascript"), ...sharedFiles],
  };
  implementations.push({ ...body, contentDigest: compiler.implementationDigest(body) });
}
const components =
  config.group && !config.components
    ? []
    : await buildComponents({ config, compiler, plan, pkg, output, recordFile, generated });
if (!config.group || config.service.entry)
  await buildService({ config, compiler, pkg, output, coreServer, sharedFiles, implementations, recordFile });

const manifest = compiler.parsePackageArtifacts({
  schemaVersion: 1,
  packageRevisionId: pkg.revision,
  bindingDigest: pkg.bindingDigest,
  sourceDigest: pkg.sourceDigest,
  versions: plan.definition.versions,
  implementations,
  ...(components.length ? { components } : {}),
});
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));