import "../setup.ts";
import { assertEquals } from "@std/assert";
import { DatabaseSync } from "node:sqlite";
import { runMigrations } from "../../db/migrate.ts";

const SCHEMA = Deno.readTextFileSync(
  new URL("../../db/schema.sql", import.meta.url),
);

function freshDb(): DatabaseSync {
  const db = new DatabaseSync(":memory:");
  db.exec(SCHEMA);
  return db;
}

function schemaOf(db: DatabaseSync): string[] {
  return (db.prepare(
    `SELECT sql FROM sqlite_master WHERE sql IS NOT NULL AND name != 'schema_migrations' ORDER BY name;`,
  ).all() as { sql: string }[]).map((r) => r.sql);
}

Deno.test("runMigrations: a fresh database is left as schema.sql made it", () => {
  const db = freshDb();
  const before = schemaOf(db);
  runMigrations(db);
  assertEquals(schemaOf(db), before);
  const applied = db.prepare(`SELECT COUNT(*) as n FROM schema_migrations;`)
    .get() as {
      n: number;
    };
  assertEquals(applied.n, 19);
  // Running again applies nothing.
  runMigrations(db);
  assertEquals(
    (db.prepare(`SELECT COUNT(*) as n FROM schema_migrations;`).get() as {
      n: number;
    }).n,
    19,
  );
  db.close();
});