import { describe, it, expect, beforeEach, afterAll } from "vitest";
import { createPool, resetDB } from "./helpers";

const pool = createPool();

beforeEach(async () => {
  await resetDB(pool);
});

afterAll(async () => {
  await pool.end();
});

// This tests the name-substitution logic applied in /api/participants GET.
// The rule: the participant matching the current user's ID gets name "Me";
// everyone else keeps their real name.
function substituteMe(
  participants: { id: number; name: string }[],
  currentUserId: number
) {
  return participants.map((p) =>
    p.id === currentUserId ? { ...p, name: "Me" } : p
  );
}

describe("participant Me substitution", () => {
  it("replaces the current user's name with Me", async () => {
    const r = await pool.query(
      `INSERT INTO participants (name) VALUES ('Siddharth') RETURNING id`
    );
    const userId = r.rows[0].id;
    const participants = [
      { id: userId, name: "Siddharth" },
      { id: userId + 1, name: "Sonu" },
    ];

    const result = substituteMe(participants, userId);
    expect(result.find((p) => p.id === userId)?.name).toBe("Me");
    expect(result.find((p) => p.id === userId + 1)?.name).toBe("Sonu");
  });

  it("leaves all names unchanged when currentUserId does not match", () => {
    const participants = [
      { id: 1, name: "Siddharth" },
      { id: 2, name: "Sonu" },
    ];
    const result = substituteMe(participants, 999);
    expect(result).toEqual(participants);
  });

  it("Sonu sees Me for herself and Siddharth for the primary user", async () => {
    const r1 = await pool.query(
      `INSERT INTO participants (name) VALUES ('Siddharth') RETURNING id`
    );
    const r2 = await pool.query(
      `INSERT INTO participants (name, email) VALUES ('Sonu', 'sonu@example.com') RETURNING id`
    );
    const siddharthId = r1.rows[0].id;
    const sonuId = r2.rows[0].id;

    const rawParticipants = [
      { id: siddharthId, name: "Siddharth" },
      { id: sonuId, name: "Sonu" },
    ];

    // Siddharth's view
    const siddharthView = substituteMe(rawParticipants, siddharthId);
    expect(siddharthView.find((p) => p.id === siddharthId)?.name).toBe("Me");
    expect(siddharthView.find((p) => p.id === sonuId)?.name).toBe("Sonu");

    // Sonu's view
    const sonuView = substituteMe(rawParticipants, sonuId);
    expect(sonuView.find((p) => p.id === siddharthId)?.name).toBe("Siddharth");
    expect(sonuView.find((p) => p.id === sonuId)?.name).toBe("Me");
  });
});