// Validates the built Signage package and its migrations the way the platform reads them, with only
// Ekklesia's published module-development packages: no Ekklesia checkout, no database.
//
//   pnpm build && pnpm validate
//
// What it checks:
//   - the manifest parses, and its id and version match package.json and the built runtime;
//   - every declared entrypoint exists in the built package;
//   - the built runtime declares the same Module Database ABI as the manifest (Core refuses a
//     mismatch);
//   - the built schema entrypoint's only export is plain ABI v1 metadata for this module's own,
//     namespaced tables, and every foreign key targets one of them;
//   - the installed module SDK satisfies the manifest's `compatibility.moduleSdk`;
//   - the migration journal and policy parse, name the same migrations in the same order, and every
//     migration's SQL is present.
//
// What it cannot check, because only Ekklesia itself can: compatibility with a particular platform
// installation, capability and module dependencies between installed modules, and a migration's
// checksum against a database's applied history. The module packager and the platform's package
// verifier re-check all of the above when Signage is built as a Module Package.
import { readFile, stat } from "node:fs/promises";
import { fileURLToPath, pathToFileURL } from "node:url";
import { defineModuleSchemaMetadata, moduleTablePrefix } from "@ekklesia/module-database";
import {
  parseDrizzleMigrationJournal,
  parseModuleManifest,
  parseModuleMigrationPolicy,
} from "@ekklesia/module-sdk";

const root = fileURLToPath(new URL("..", import.meta.url));
const failures = [];
const passes = [];

function check(condition, description) {
  (condition ? passes : failures).push(description);
}

async function json(relative) {
  return JSON.parse(await readFile(new URL(relative, pathToFileURL(root)), "utf8"));
}

async function exists(relative) {
  try {
    return (await stat(new URL(relative, pathToFileURL(root)))).isFile();
  } catch {
    return false;
  }
}

/** A caret range, `^X.Y.Z`, as the platform's manifests write them. Anything else is refused here
 * rather than half understood. */
function satisfiesCaret(version, range) {
  const wanted = /^\^(\d+)\.(\d+)\.(\d+)$/u.exec(range);
  const actual = /^(\d+)\.(\d+)\.(\d+)$/u.exec(version);
  if (!wanted || !actual) {
    return false;
  }
  const [w, a] = [wanted.slice(1).map(Number), actual.slice(1).map(Number)];
  if (w[0] !== a[0] || (w[0] === 0 && w[1] !== a[1])) {
    return false;
  }
  for (let index = 0; index < 3; index += 1) {
    if (a[index] !== w[index]) {
      return a[index] > w[index];
    }
  }
  return true;
}

const packageJson = await json("package.json");
const manifest = parseModuleManifest(await json("ekklesia.module.json"));
check(true, "ekklesia.module.json is a valid manifest");
check(packageJson.version === manifest.version, "package.json and the manifest name one version");
check(packageJson.type === "module", "the package is ESM");
check(packageJson.ekklesia?.layer === "module", "the package carries the module layer marker");

const { server, schema, migrations, ui, display } = manifest.entrypoints;
for (const entrypoint of [server, schema, ui, display?.artifact].filter(Boolean)) {
  check(await exists(entrypoint), `the built package has ${entrypoint}`);
}

const runtime = (await import(new URL(server, pathToFileURL(root)).href)).default;
check(runtime?.id === manifest.id, "the built runtime's id is the manifest's");
check(runtime?.version === manifest.version, "the built runtime's version is the manifest's");
check(
  JSON.stringify(runtime?.database ?? null) === JSON.stringify(manifest.database ?? null),
  "the built runtime declares the manifest's database ABI",
);

if (schema) {
  const namespace = await import(new URL(schema, pathToFileURL(root)).href);
  check(
    Object.keys(namespace).join() === "default",
    "the schema entrypoint exports nothing but its metadata",
  );
  const metadata = defineModuleSchemaMetadata(namespace.default);
  check(
    JSON.stringify(JSON.parse(JSON.stringify(metadata))) === JSON.stringify(metadata),
    "the schema metadata is plain data",
  );
  check(metadata.moduleId === manifest.id, "the schema metadata is this module's");
  const prefix = moduleTablePrefix(manifest.id);
  const owned = new Set(metadata.tables.map((table) => table.name));
  check(
    metadata.tables.every((table) => table.name.startsWith(prefix)),
    `every table is in the ${prefix} namespace`,
  );
  check(
    metadata.tables.every((table) => table.foreignKeys.every((key) => owned.has(key.table))),
    "every foreign key targets one of this module's own tables",
  );
}

const sdkVersion = (await json("node_modules/@ekklesia/module-sdk/package.json")).version;
check(
  satisfiesCaret(sdkVersion, manifest.compatibility.moduleSdk),
  `the installed module SDK ${sdkVersion} satisfies compatibility.moduleSdk ${manifest.compatibility.moduleSdk}`,
);

if (migrations) {
  const directory = migrations.endsWith("/") ? migrations : `${migrations}/`;
  const journal = parseDrizzleMigrationJournal(await json(`${directory}meta/_journal.json`));
  const policy = parseModuleMigrationPolicy(await json(`${directory}meta/_ekklesia.json`));
  check(policy.moduleId === manifest.id, "the migration policy is this module's");
  check(
    journal.entries.map((entry) => entry.tag).join() ===
      policy.entries.map((entry) => entry.tag).join(),
    "the migration journal and policy name the same migrations in the same order",
  );
  for (const entry of journal.entries) {
    check(await exists(`${directory}${entry.tag}.sql`), `${entry.tag}.sql is present`);
  }
}

for (const description of passes) {
  console.log(`ok   ${description}`);
}
for (const description of failures) {
  console.log(`FAIL ${description}`);
}
if (failures.length > 0) {
  console.error(`validate: ${failures.length} check(s) failed.`);
  process.exit(1);
}
console.log(`validate: ${manifest.id}@${manifest.version} passed ${passes.length} checks.`);