import { createHash } from "node:crypto";
import { readdirSync, readFileSync, writeFileSync } from "node:fs";
import { join, resolve } from "node:path";

const projectRoot = resolve(import.meta.dir, "..");
const migrationsDir = join(projectRoot, "drizzle");
const outputPath = join(projectRoot, ".build", "migrations-data.ts");

function generateMigrationsData() {
  let entries: string[];
  try {
    entries = readdirSync(migrationsDir)
      .filter((f) => f.endsWith(".sql"))
      .sort();
  } catch {
    entries = [];
  }

  const records = entries.map((filename) => {
    const sql = readFileSync(join(migrationsDir, filename), "utf-8");
    const id = filename.replace(/\.sql$/, "");
    const checksum = createHash("sha256").update(sql).digest("hex").slice(0, 16);
    return { checksum, id, sql: sql.trim() };
  });

  const lines = [
    `import type { MigrationRecord } from "../src/server/db/load-migrations";`,
    ``,
    `export const MIGRATIONS: MigrationRecord[] = [`,
    ...records.map(
      (r) =>
        `  { id: ${JSON.stringify(r.id)}, sql: ${JSON.stringify(r.sql)}, checksum: ${JSON.stringify(r.checksum)} },`,
    ),
    `];`,
    ``,
  ].join("\n");

  writeFileSync(outputPath, lines);
  console.log(`Generated ${outputPath} with ${records.length} migration(s)`);
}

generateMigrationsData();