import delay from "delay";
import range from "lodash/range";
import hash from "object-hash";
import type { Shard } from "../../abstract/Shard";
import { mapJoin, nullthrows } from "../../internal/misc";
import { PgSchema } from "../PgSchema";
import type { TestPgClient } from "./test-utils";
import { recreateTestTables, shardRun, testCluster } from "./test-utils";

const schema = new PgSchema(
  'pg-schema.stress"table',
  {
    id: { type: String, autoInsert: "id_gen()" },
    prefix: { type: String },
    name: { type: String },
  },
  ["prefix", "name"],
);

let shard: Shard<TestPgClient>;

beforeEach(async () => {
  await recreateTestTables([
    {
      CREATE: [
        `CREATE TABLE %T(
          id bigint NOT NULL PRIMARY KEY,
          prefix text NOT NULL,
          name text NOT NULL,
          UNIQUE (prefix, name)
        )`,
      ],
      SCHEMA: schema,
      SHARD_AFFINITY: [],
    },
  ]);

  shard = await testCluster.randomShard();
});

test("stress", async () => {
  await runStress(50, 18, async (uniq) => {
    const names = range(2).map((i) => i + "-" + uniq);

    const ids = await mapJoin(names, async (name) =>
      shardRun(shard, schema.insert({ prefix: "pfx", name })),
    );

    await mapJoin(ids, async (id, i) => {
      const row = nullthrows(
        await shardRun(shard, schema.load(nullthrows(id))),
      );
      expect(row.name).toEqual(names[i]);
    });

    await mapJoin(ids, async (id, i) => {
      const row = nullthrows(
        await shardRun(shard, schema.loadBy({ prefix: "pfx", name: names[i] })),
      );
      expect(row.id).toEqual(id);
    });

    await mapJoin(ids, async (id, i) => {
      const updated = await shardRun(
        shard,
        schema.update(nullthrows(id), { name: `upd${names[i]}` }),
      );
      expect(updated).toBeTruthy();
      const row = nullthrows(
        await shardRun(shard, schema.load(nullthrows(id))),
      );
      expect(row.name).toEqual(`upd${names[i]}`);
    });
  });
});

async function runStress(
  parallelism: number,
  iterations: number,
  func: (uniq: string) => Promise<void>,
): Promise<void> {
  let uniq = "";
  await mapJoin(range(parallelism), async () => {
    for (let i = 0; i < iterations; i++) {
      await delay(Math.round(Math.random() * 5));
      uniq = hash(uniq);
      await func(uniq);
    }
  });
}