import fs from "node:fs";
import path from "node:path";
import { performance } from "node:perf_hooks";
import { expect, test, type Route } from "@playwright/test";

const targetTenantId =
  process.env.TENANT_PROFILE_PERF_TENANT_ID ??
  "56cd0fd7-b62a-43c0-8db9-74a30468d7cb";
const evidenceDir = path.resolve("e2e-evidence");

type ApiTiming = {
  method: string;
  url: string;
  status: number;
  durationMs: number;
};

type Measurement = {
  sample: number;
  configFieldsVisibleMs: number;
  networkIdleMs: number;
  orgUnitType: string | null;
  visibility: string | null;
  worksmobileSync: string | null;
  apiTimings: ApiTiming[];
};

async function fulfillFromLocalApi(route: Route, targetUrl?: string) {
  const request = route.request();
  const corsHeaders = {
    "access-control-allow-headers": "authorization,content-type,x-test-role",
    "access-control-allow-methods": "GET,POST,PUT,PATCH,DELETE,OPTIONS",
    "access-control-allow-origin": "*",
  };

  if (request.method() === "OPTIONS") {
    await route.fulfill({ status: 204, headers: corsHeaders });
    return;
  }

  const headers = { ...request.headers(), "x-test-role": "super_admin" };
  delete headers.authorization;
  delete headers.host;

  const response = await route.fetch({ url: targetUrl, headers });
  await route.fulfill({
    response,
    headers: { ...response.headers(), ...corsHeaders },
  });
}

function resolveActualApiBaseUrl() {
  const explicitApiBaseUrl = process.env.TENANT_PROFILE_PERF_API_BASE_URL;
  if (explicitApiBaseUrl?.trim()) {
    return explicitApiBaseUrl.trim().replace(/\/$/, "");
  }

  const proxyTarget = process.env.API_PROXY_TARGET;
  if (proxyTarget?.trim()) {
    return new URL("/api", `${proxyTarget.trim().replace(/\/$/, "")}/`)
      .toString()
      .replace(/\/$/, "");
  }

  return "http://127.0.0.1:5173/api";
}

async function canFetchJsonFromLocalApi(apiBaseUrl: string) {
  const probeUrl = `${apiBaseUrl.replace(/\/$/, "")}/v1/user/me`;
  try {
    const response = await fetch(probeUrl, {
      headers: { "x-test-role": "super_admin" },
    });
    const contentType = response.headers.get("content-type") ?? "";
    return contentType.toLowerCase().includes("application/json");
  } catch {
    return false;
  }
}

function percentile(values: number[], ratio: number) {
  const sorted = [...values].sort((left, right) => left - right);
  const index = Math.min(
    sorted.length - 1,
    Math.ceil(sorted.length * ratio) - 1,
  );
  return sorted[index] ?? 0;
}

test.describe("Tenant profile local performance evidence", () => {
  test("loads org config fields through the local API within 500ms", async ({
    page,
  }, testInfo) => {
    const actualApiBaseUrl = resolveActualApiBaseUrl();
    test.skip(
      !(await canFetchJsonFromLocalApi(actualApiBaseUrl)),
      `Local API is not available at ${actualApiBaseUrl}; set TENANT_PROFILE_PERF_API_BASE_URL to run this evidence test.`,
    );
    const normalizedActualApiBaseUrl = actualApiBaseUrl.replace(/\/$/, "");

    fs.mkdirSync(evidenceDir, { recursive: true });
    await page.setViewportSize({ width: 1440, height: 900 });

    await page.addInitScript(() => {
      window.localStorage.setItem("locale", "ko");
      window.localStorage.setItem("X-Mock-Role-Enabled", "true");
      window.localStorage.setItem("X-Mock-Role", "super_admin");
      window.localStorage.removeItem("admin_session");
      for (const key of Object.keys(window.localStorage)) {
        if (key.startsWith("oidc.user:")) {
          window.localStorage.removeItem(key);
        }
      }
      (
        window as Window & typeof globalThis & { _IS_TEST_MODE?: boolean }
      )._IS_TEST_MODE = true;
    });

    await page.route("**/oidc/**", async (route) => {
      await route.fulfill({ json: { issuer: "http://localhost:5000/oidc" } });
    });

    await page.route("**/api/**", async (route) => {
      await fulfillFromLocalApi(route);
    });

    await page.route("http://playwright-mock/api/**", async (route) => {
      const request = route.request();
      const source = new URL(request.url());
      const target = `${normalizedActualApiBaseUrl}${source.pathname.replace(
        /^\/api/,
        "",
      )}${source.search}`;
      await fulfillFromLocalApi(route, target);
    });

    const requestStartedAt = new Map<string, number>();
    const apiTimings: ApiTiming[] = [];

    page.on("request", (request) => {
      const url = request.url();
      if (url.includes("/api/v1/") || url.includes("playwright-mock/api")) {
        requestStartedAt.set(request.url(), performance.now());
      }
    });
    page.on("response", (response) => {
      const request = response.request();
      const startedAt = requestStartedAt.get(request.url());
      if (startedAt === undefined) {
        return;
      }
      const timing = {
        method: request.method(),
        url: response.url(),
        status: response.status(),
        durationMs: Math.round(performance.now() - startedAt),
      };
      apiTimings.push(timing);
    });
    page.on("requestfailed", (request) => {
      const url = request.url();
      if (url.includes("/api/v1/") || url.includes("playwright-mock/api")) {
        console.log(
          "api-request-failed",
          JSON.stringify({
            method: request.method(),
            url,
            failure: request.failure()?.errorText,
          }),
        );
      }
    });

    const measurements: Measurement[] = [];
    const sampleCount = 5;

    for (let sample = 1; sample <= sampleCount; sample += 1) {
      apiTimings.length = 0;
      const startedAt = performance.now();

      await page.goto(`/tenants/${targetTenantId}`, {
        waitUntil: "domcontentloaded",
      });

      const orgUnitTypeSelect = page.getByTestId("tenant-org-unit-type-select");
      await expect(orgUnitTypeSelect).toBeVisible({ timeout: 15000 });
      await expect(page.locator("#tenant-visibility")).toBeVisible();
      await expect(page.locator("#worksmobileExcluded")).toBeVisible();

      const configFieldsVisibleMs = Math.round(performance.now() - startedAt);
      await page.waitForLoadState("networkidle", { timeout: 15000 });
      const networkIdleMs = Math.round(performance.now() - startedAt);

      measurements.push({
        sample,
        configFieldsVisibleMs,
        networkIdleMs,
        orgUnitType: await orgUnitTypeSelect.inputValue(),
        visibility: await page.locator("#tenant-visibility").inputValue(),
        worksmobileSync: await page
          .locator("#worksmobileExcluded")
          .inputValue(),
        apiTimings: [...apiTimings],
      });
    }

    const screenshotPath = path.join(
      evidenceDir,
      "tenant-profile-performance-local.png",
    );
    await page.screenshot({ path: screenshotPath, fullPage: true });

    const configTimes = measurements.map(
      (measurement) => measurement.configFieldsVisibleMs,
    );
    const networkIdleTimes = measurements.map(
      (measurement) => measurement.networkIdleMs,
    );
    const evidence = {
      metric: "tenant-profile-local-performance",
      tenantId: targetTenantId,
      actualApiBaseUrl,
      measuredAt: new Date().toISOString(),
      browser: testInfo.project.name,
      samples: measurements,
      summary: {
        configFieldsVisibleMs: {
          min: Math.min(...configTimes),
          max: Math.max(...configTimes),
          p50: percentile(configTimes, 0.5),
          p95: percentile(configTimes, 0.95),
        },
        networkIdleMs: {
          min: Math.min(...networkIdleTimes),
          max: Math.max(...networkIdleTimes),
          p50: percentile(networkIdleTimes, 0.5),
          p95: percentile(networkIdleTimes, 0.95),
        },
      },
      screenshotPath,
    };
    const evidencePath = path.join(
      evidenceDir,
      "tenant-profile-performance-local.json",
    );
    fs.writeFileSync(evidencePath, `${JSON.stringify(evidence, null, 2)}\n`);

    console.log(JSON.stringify(evidence, null, 2));

    const configVisibleBudgetMs =
      testInfo.project.name === "firefox" ? 1200 : 500;
    expect(evidence.summary.configFieldsVisibleMs.p95).toBeLessThanOrEqual(
      configVisibleBudgetMs,
    );
  });
});