import fs from "node:fs/promises";
import path from "node:path";
import {contentDigest} from "../capability-model/evolution.js";
import {validateMigrationCatalog, type MigrationCatalog} from "../capability-model/migrations.js";
import {applyStructure, planStructure} from "./structural-plan.js";

/** Explicitly acknowledge edited migration code. This does not change retained
 * contracts or grant activation approval; the immutable checker verifies it. */
export async function sealMigrations(directory: string) {
  const root = await fs.realpath(directory);
  const file = "quixos.migrations.json";
  const before = await fs.readFile(path.join(root, file), "utf8");
  const catalog = JSON.parse(before) as MigrationCatalog;
  for (const migration of catalog.migrations) {
    const implementation = await fs.realpath(path.join(root, migration.implementation.file));
    if (!implementation.startsWith(root + path.sep)) throw new Error("Migration implementation escapes package");
    migration.implementation.digest = contentDigest(await fs.readFile(implementation, "utf8"));
  }
  validateMigrationCatalog(catalog);
  return applyStructure(await planStructure(root, {kind: "package", validation: "syntax", files: [
    {file, expected: before, replace: JSON.stringify(catalog, null, 2) + "\n"},
  ]}));
}