import { test, expect } from "@playwright/test";
import { resolveUrl, getSessionCookie, parseSSEStream, lastSSEOfType } from "./helpers";

/**
 * E2E tests for comparison list and detail views.
 * Covers: /api/comparisons/[slug], /api/user/comparisons
 */
test.describe("Comparisons", () => {
  let cookie: string;
  let testSlug: string;

  test.beforeAll(async ({ page }) => {
    cookie = await getSessionCookie(page);

    // Create a comparison to ensure we have data
    const res = await page.request.post(resolveUrl("/api/compare"), {
      data: { query: "Cats vs Dogs", items: ["Cats", "Dogs"] },
      headers: { "Content-Type": "application/json", Cookie: cookie, Accept: "text/event-stream" },
      timeout: 120_000,
    });

    if (res.ok()) {
      const body = Buffer.from((await res.body()) ?? []).toString("utf-8");
      const events = await parseSSEStream(body);
      const done = lastSSEOfType(events, "done") as Record<string, unknown> | undefined;
      if (done) {
        testSlug = (done.done as Record<string, unknown>).slug as string;
      }
    }
  });

  test("1. User comparisons list returns 200 for authenticated user", async ({ page }) => {
    const res = await page.request.get(resolveUrl("/api/user/comparisons"), {
      headers: { Cookie: cookie },
    });
    expect(res.status()).toBe(200);
    const data = await res.json();
    expect(Array.isArray(data)).toBe(true);
  });

  test("2. User comparisons list requires auth", async ({ page }) => {
    const res = await page.request.get(resolveUrl("/api/user/comparisons"));
    expect(res.status()).toBe(401);
  });

  test("3. Get comparison by slug returns 200 with data", async ({ page }) => {
    if (!testSlug) { test.skip(); return; }

    const res = await page.request.get(resolveUrl(`/api/comparisons/${testSlug}`), {
      headers: { Cookie: cookie },
    });
    expect(res.status()).toBe(200);
    const data = await res.json();
    expect(data).toHaveProperty("slug", testSlug);
    expect(data).toHaveProperty("status");
    expect(["completed", "failed", "researching"]).toContain(data.status);
  });

  test("4. Get comparison by non-existent slug returns 404", async ({ page }) => {
    const res = await page.request.get(resolveUrl("/api/comparisons/this-slug-does-not-exist-xyz123"), {
      headers: { Cookie: cookie },
    });
    expect(res.status()).toBe(404);
  });

  test("5. Comparison slug increments view count", async ({ page }) => {
    if (!testSlug) { test.skip(); return; }

    const res1 = await page.request.get(resolveUrl(`/api/comparisons/${testSlug}`), {
      headers: { Cookie: cookie },
    });
    const viewsBefore = (await res1.json()).viewCount ?? 0;

    const res2 = await page.request.get(resolveUrl(`/api/comparisons/${testSlug}`), {
      headers: { Cookie: cookie },
    });
    const viewsAfter = (await res2.json()).viewCount ?? 0;

    expect(viewsAfter).toBeGreaterThanOrEqual(viewsBefore);
  });

  test("6. Comparison response includes all required fields", async ({ page }) => {
    if (!testSlug) { test.skip(); return; }

    const res = await page.request.get(resolveUrl(`/api/comparisons/${testSlug}`), {
      headers: { Cookie: cookie },
    });
    const data = await res.json();
    expect(data).toHaveProperty("id");
    expect(data).toHaveProperty("title");
    expect(data).toHaveProperty("slug");
    expect(data).toHaveProperty("status");
    expect(data).toHaveProperty("query");
  });
});