/**
 * E2E API tests — runs against a running backend instance.
 * Usage: API_BASE=http://localhost:4001 vitest run
 */
import { describe, expect, it } from "vitest";

const BASE = process.env.API_BASE ?? "http://localhost:4001/api";

/** Result of a JSON API call: status + parsed body (or null for 204/empty). */
interface ApiResult {
  status: number;
  body: Record<string, unknown> | null;
}

async function api(path: string, init?: RequestInit): Promise<ApiResult> {
  const res = await fetch(`${BASE}${path}`, {
    ...init,
    headers: { "Content-Type": "application/json", ...init?.headers },
  });
  const body = res.status !== 204 ? await res.json().catch(() => null) : null;
  return { status: res.status, body };
}

describe("API Health", () => {
  it("GET /health returns 200 with status=healthy", async () => {
    const { status, body } = await api("/health");
    expect(status).toBe(200);
    expect(body?.status).toBe("healthy");
  });

  it("GET /metrics returns prometheus text", async () => {
    const base = BASE.endsWith("/api") ? BASE.slice(0, -4) : BASE;
    const res = await fetch(`${base}/api/metrics`);
    expect(res.status).toBe(200);
    const text = await res.text();
    expect(text).toContain("nodejs");
  });
});

describe("API Dashboard", () => {
  it("GET /dashboard/stats returns stats fields", async () => {
    const { status, body } = await api("/dashboard/stats");
    expect(status).toBe(200);
    expect(body).toHaveProperty("total_messages");
    expect(body).toHaveProperty("total_flagged");
    expect(body).toHaveProperty("active_users_24h");
    expect(typeof body.total_messages).toBe("number");
  });
});

describe("API Config", () => {
  it("GET /config returns 200", async () => {
    const { status } = await api("/config");
    expect(status).toBe(200);
  });
});

describe("API Negative", () => {
  it("GET /nonexistent returns 404", async () => {
    const { status } = await api("/nonexistent");
    expect(status).toBe(404);
  });

  it("GET /messages without channelId returns 400", async () => {
    const { status } = await api("/messages?limit=3");
    expect(status).toBe(400);
  });
});