#!/usr/bin/env node
/**
 * Build the seeded template database, then clone it once per shard.
 *
 *   node integration/scripts/prepare-shards.mjs            # seed template + clone
 *   node integration/scripts/prepare-shards.mjs --clone    # clone only (per-run reset)
 *
 * Seeding has to happen here, not in vitest's globalSetup, because the order is
 * load-bearing and half of it is the app itself:
 *
 *   1. freight migrations            (freight-migration-e2e container, before us)
 *   2. the app's always-on boot seeders — org, units, positions, permissions
 *      (app.module.ts onApplicationBootstrap)
 *   3. the SQL fixtures, which declare those as prerequisites
 *      (seed-users.sql: "created by the API's always-on boot seeders")
 *
 * Step 2 needs a real Nest boot, and the app now lives inside the vitest workers
 * — which globalSetup runs in a different process from. So we boot it once here
 * against the template and every shard is a `CREATE DATABASE … TEMPLATE` copy of
 * the result: a file copy on the tmpfs postgres, versus re-running migrations
 * and five seeders per shard.
 *
 * Run by it.mjs, which owns the env. No dependencies beyond `pg`.
 */
import { createRequire } from "node:module";
import { readFileSync } from "node:fs";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";
import { Client } from "pg";

const itDir = resolve(dirname(fileURLToPath(import.meta.url)), "..");
const repoRoot = resolve(itDir, "..");
const freightDir = join(repoRoot, "apps", "edr-freight-api");

const TEMPLATE = process.env.IT_TEMPLATE_DB ?? "edr_freight_e2e";
const PREFIX = process.env.IT_DB_PREFIX ?? "edr_it_s";
const SHARDS = Number(process.env.IT_SHARDS ?? 1);

const admin = () =>
  new Client({
    host: process.env.DB_HOST ?? "localhost",
    port: Number(process.env.DB_PORT ?? 5543),
    user: process.env.DB_USER ?? "edr_e2e",
    password: process.env.DB_PASSWORD ?? "edr_e2e",
    // Never the template itself: CREATE DATABASE … TEMPLATE refuses while any
    // session is connected to the source.
    database: "postgres",
  });

const CYPRESS_FIXTURES = join(repoRoot, "e2e", "freight", "cypress", "fixtures");
const OWN_FIXTURES = join(itDir, "sql");

/** Order matters — company needs the users, everything needs the corridor. */
const SEEDS = [
  [CYPRESS_FIXTURES, "seed-users.sql"],
  [CYPRESS_FIXTURES, "seed-company.sql"],
  [CYPRESS_FIXTURES, "seed-import-corridor.sql"],
  [CYPRESS_FIXTURES, "seed-bulk-items.sql"],
  [CYPRESS_FIXTURES, "seed-g1-train.sql"],
  [CYPRESS_FIXTURES, "seed-g2-weight.sql"],
  [CYPRESS_FIXTURES, "seed-government.sql"],
  [OWN_FIXTURES, "seed-company-b.sql"],
  [OWN_FIXTURES, "seed-customs-service-type.sql"],
];

async function seedTemplate() {
  console.log(`it: seeding template ${TEMPLATE}`);

  process.env.DB_NAME = TEMPLATE;
  // No broker for the template boot: payment.module.ts skips RabbitMQModule
  // entirely when this is unset, and nothing here publishes.
  delete process.env.PAYMENT_RABBITMQ_URL;

  const { createFreightApp } = createRequire(join(freightDir, "package.json"))("./dist/main.js");

  // createFreightApp() only builds the graph. `init()` is what fires
  // onApplicationBootstrap — the seeders we are here for. We never listen.
  const app = await createFreightApp();
  try {
    await app.init();
    console.log("it: boot seeders done (org, units, positions, permissions)");
  } finally {
    await app.close();
  }

  const client = new Client({
    host: process.env.DB_HOST ?? "localhost",
    port: Number(process.env.DB_PORT ?? 5543),
    user: process.env.DB_USER ?? "edr_e2e",
    password: process.env.DB_PASSWORD ?? "edr_e2e",
    database: TEMPLATE,
  });
  await client.connect();
  try {
    for (const [dir, file] of SEEDS) {
      await client.query(readFileSync(join(dir, file), "utf8"));
      console.log(`it: seeded ${file}`);
    }
  } finally {
    await client.end();
  }
}

async function cloneShards() {
  const pg = admin();
  await pg.connect();
  try {
    // The app's pool and any stray psql hold the template open; without this the
    // CREATE below fails with "source database is being accessed by other users".
    await pg.query(
      `SELECT pg_terminate_backend(pid) FROM pg_stat_activity
        WHERE datname = $1 AND pid <> pg_backend_pid()`,
      [TEMPLATE],
    );

    for (let i = 0; i < SHARDS; i++) {
      const db = `${PREFIX}${i}`;
      await pg.query(
        `SELECT pg_terminate_backend(pid) FROM pg_stat_activity
          WHERE datname = $1 AND pid <> pg_backend_pid()`,
        [db],
      );
      await pg.query(`DROP DATABASE IF EXISTS ${db}`);
      await pg.query(`CREATE DATABASE ${db} TEMPLATE ${TEMPLATE}`);
      console.log(`it: shard ${i} → ${db}`);
    }
  } finally {
    await pg.end();
  }
}

const cloneOnly = process.argv.includes("--clone");
if (!cloneOnly) await seedTemplate();
await cloneShards();