/**
 * TASK-0135: routing-helper unit tests. The PrismaClient is LAZY (no
 * connection at construction), so these assert the ROUTING without a DB:
 * which client `db.read()` / `db.write()` return, and the hasReplica flag.
 * The live behavior (a write-then-read-your-write on the same request
 * always hits the primary) is covered by
 * tests/integration/replica-routing.integration.test.ts.
 */
import { describe, expect, it } from "vitest";
import { createDatabaseClients } from "./index.js";

const PRIMARY = "postgresql://factory:factory@localhost:5432/factory";
const REPLICA = "postgresql://factory:factory@localhost:5433/factory";

describe("createDatabaseClients routing (TASK-0135)", () => {
  it("with a replica URL: read() → replica, write() → primary, hasReplica true", () => {
    const db = createDatabaseClients({ databaseUrl: PRIMARY, databaseReplicaUrl: REPLICA });
    try {
      expect(db.hasReplica).toBe(true);
      expect(db.write()).toBe(db.primary);
      expect(db.read()).toBe(db.reader);
      expect(db.reader).not.toBe(db.primary); // a distinct replica client
    } finally {
      void db.disconnect();
    }
  });

  it("without a replica URL: the reader IS the primary (single-node dev/CI)", () => {
    const db = createDatabaseClients({ databaseUrl: PRIMARY });
    try {
      expect(db.hasReplica).toBe(false);
      expect(db.read()).toBe(db.primary);
      expect(db.write()).toBe(db.primary);
      expect(db.reader).toBe(db.primary);
    } finally {
      void db.disconnect();
    }
  });

  it("write() is ALWAYS the primary, regardless of replica config", () => {
    for (const replica of [REPLICA, undefined, ""]) {
      const db = createDatabaseClients({ databaseUrl: PRIMARY, databaseReplicaUrl: replica });
      try {
        expect(db.write()).toBe(db.primary);
      } finally {
        void db.disconnect();
      }
    }
  });
});