const path = require("path");
const jwt = require("jsonwebtoken");
const dotenv = require("dotenv");
const { expect } = require("@playwright/test");

dotenv.config({ path: path.resolve(__dirname, "../../.env") });

const PUBLIC_SECRET = process.env.PUBLIC_JWT_SECRET || "change_me_public";
const PUBLIC_COOKIE_NAME = process.env.PUBLIC_COOKIE_NAME || "public_jwt";
const ADMIN_EMAIL = process.env.E2E_ADMIN_EMAIL || "admin@example.com";
const ADMIN_PASSWORD = process.env.E2E_ADMIN_PASSWORD || "admin123";

function randomDigits(length) {
  let value = "";
  while (value.length < length) {
    value += String(Math.floor(Math.random() * 10));
  }
  return value.slice(0, length);
}

function randomPhone() {
  return `+79${randomDigits(9)}`;
}

function buildTinyPdfBuffer(label = "E2E PDF") {
  const safe = String(label || "E2E PDF").replace(/[()\\]/g, " ");
  const stream = `BT /F1 16 Tf 24 96 Td (${safe}) Tj ET`;
  const objects = [
    "<< /Type /Catalog /Pages 2 0 R >>",
    "<< /Type /Pages /Count 1 /Kids [3 0 R] >>",
    "<< /Type /Page /Parent 2 0 R /MediaBox [0 0 300 144] /Contents 4 0 R /Resources << /Font << /F1 5 0 R >> >> >>",
    `<< /Length ${Buffer.byteLength(stream, "utf-8")} >>\nstream\n${stream}\nendstream`,
    "<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>",
  ];

  let pdf = "%PDF-1.4\n";
  const offsets = [0];
  for (let i = 0; i < objects.length; i += 1) {
    offsets.push(Buffer.byteLength(pdf, "utf-8"));
    pdf += `${i + 1} 0 obj\n${objects[i]}\nendobj\n`;
  }

  const xrefOffset = Buffer.byteLength(pdf, "utf-8");
  pdf += `xref\n0 ${objects.length + 1}\n`;
  pdf += "0000000000 65535 f \n";
  for (let i = 1; i < offsets.length; i += 1) {
    pdf += `${String(offsets[i]).padStart(10, "0")} 00000 n \n`;
  }
  pdf += `trailer\n<< /Root 1 0 R /Size ${objects.length + 1} >>\nstartxref\n${xrefOffset}\n%%EOF\n`;
  return Buffer.from(pdf, "utf-8");
}

function detectMimeForFixture(fileName) {
  const lower = String(fileName || "").toLowerCase();
  if (lower.endsWith(".pdf")) return "application/pdf";
  if (lower.endsWith(".txt")) return "text/plain";
  if (lower.endsWith(".json")) return "application/json";
  return "application/octet-stream";
}

function createPublicCookieToken(phone) {
  return jwt.sign({ sub: phone, purpose: "CREATE_REQUEST" }, PUBLIC_SECRET, {
    algorithm: "HS256",
    expiresIn: "7d",
  });
}

function createPublicViewCookieToken(subject) {
  return jwt.sign({ sub: subject, purpose: "VIEW_REQUEST" }, PUBLIC_SECRET, {
    algorithm: "HS256",
    expiresIn: "7d",
  });
}

function createCleanupTracker() {
  const state = {
    track_numbers: new Set(),
    phones: new Set(),
    emails: new Set(),
    hasArtifacts: false,
  };
  return {
    addTrack(value) {
      const text = String(value || "").trim();
      if (!text) return;
      state.track_numbers.add(text);
      state.hasArtifacts = true;
    },
    addPhone(value) {
      const text = String(value || "").trim();
      if (!text) return;
      state.phones.add(text);
      state.hasArtifacts = true;
    },
    addEmail(value) {
      const text = String(value || "").trim().toLowerCase();
      if (!text) return;
      state.emails.add(text);
      state.hasArtifacts = true;
    },
    hasArtifacts() {
      return state.hasArtifacts;
    },
    toPayload() {
      return {
        track_numbers: Array.from(state.track_numbers),
        phones: Array.from(state.phones),
        emails: Array.from(state.emails),
        include_default_e2e_patterns: true,
      };
    },
  };
}

function _getCleanupTracker(testInfo) {
  if (!testInfo) return null;
  if (!testInfo._cleanupTracker) {
    testInfo._cleanupTracker = createCleanupTracker();
  }
  return testInfo._cleanupTracker;
}

function trackCleanupPhone(testInfo, phone) {
  const tracker = _getCleanupTracker(testInfo);
  if (tracker) tracker.addPhone(phone);
}

function trackCleanupTrack(testInfo, trackNumber) {
  const tracker = _getCleanupTracker(testInfo);
  if (tracker) tracker.addTrack(trackNumber);
}

function trackCleanupEmail(testInfo, email) {
  const tracker = _getCleanupTracker(testInfo);
  if (tracker) tracker.addEmail(email);
}

async function cleanupTrackedTestData(page, testInfo) {
  const tracker = testInfo && testInfo._cleanupTracker;
  if (!tracker || !tracker.hasArtifacts()) {
    return;
  }

  const baseUrl = process.env.E2E_BASE_URL || "http://localhost:8081";
  let token = "";
  const loginResponse = await page.request.post(`${baseUrl}/api/admin/auth/login`, {
    data: { email: ADMIN_EMAIL, password: ADMIN_PASSWORD },
    failOnStatusCode: false,
  });
  if (loginResponse.ok()) {
    const body = await loginResponse.json().catch(() => ({}));
    token = String(body?.access_token || "");
  }
  if (!token) {
    throw new Error(`E2E cleanup failed: admin login ${loginResponse.status()}`);
  }

  const cleanupResponse = await page.request.post(`${baseUrl}/api/admin/test-utils/cleanup-test-data`, {
    headers: { Authorization: `Bearer ${token}` },
    data: tracker.toPayload(),
    failOnStatusCode: false,
  });
  if (!cleanupResponse.ok()) {
    const text = await cleanupResponse.text().catch(() => "");
    throw new Error(`E2E cleanup failed: ${cleanupResponse.status()} ${text}`);
  }
}

async function installPromptAutoAccept(page, code = "000000") {
  page.on("dialog", async (dialog) => {
    if (dialog.type() === "prompt") {
      await dialog.accept(code);
      return;
    }
    await dialog.accept();
  });
}

async function installOtpBypassRoutes(page) {
  await page.route("**/api/public/otp/send", async (route) => {
    let purpose = "CREATE_REQUEST";
    try {
      const body = JSON.parse(route.request().postData() || "{}");
      purpose = String(body.purpose || purpose);
    } catch (_) {}

    await route.fulfill({
      status: 200,
      contentType: "application/json",
      body: JSON.stringify({
        status: "sent",
        purpose,
        ttl_seconds: 600,
        sms_response: { provider: "e2e", status: "accepted", message: "ok" },
      }),
    });
  });

  await page.route("**/api/public/otp/verify", async (route) => {
    let purpose = "CREATE_REQUEST";
    try {
      const body = JSON.parse(route.request().postData() || "{}");
      purpose = String(body.purpose || purpose);
    } catch (_) {}

    await route.fulfill({
      status: 200,
      contentType: "application/json",
      body: JSON.stringify({ status: "verified", purpose }),
    });
  });
}

async function preparePublicSession(context, page, appUrl, phone) {
  await context.addCookies([
    {
      name: PUBLIC_COOKIE_NAME,
      value: createPublicCookieToken(phone),
      url: `${appUrl}/`,
      httpOnly: true,
      sameSite: "Lax",
    },
  ]);

  await installPromptAutoAccept(page);
  await installOtpBypassRoutes(page);
}

async function createRequestViaLanding(page, options = {}) {
  const phone = options.phone || randomPhone();
  const name = options.name || `Клиент E2E ${Date.now()}`;
  const description = options.description || "Проверка создания заявки через UI";

  await page.goto("/");
  await expect(page.getByRole("heading", { name: "Решаем сложные юридические задачи в интересах вашего бизнеса." })).toBeVisible();

  await page.getByRole("button", { name: "Оставить заявку" }).first().click();
  await expect(page.getByRole("heading", { name: "Создание заявки" })).toBeVisible();

  await page.locator("#name").fill(name);
  await page.locator("#phone").fill(phone);
  const topicSelect = page.locator("#topic");
  await topicSelect.waitFor();
  await topicSelect.selectOption({ index: 1 });
  await page.locator("#description").fill(description);
  await page.getByRole("button", { name: "Отправить заявку" }).click();

  const otpModal = page.locator("#otp-modal");
  const otpCodeInput = page.locator("#otp-modal-code");
  const otpSubmit = page.locator("#otp-modal-submit");
  if (await otpModal.isVisible().catch(() => false)) {
    await otpCodeInput.fill("000000");
    await otpSubmit.click();
  } else {
    await otpModal.waitFor({ state: "visible", timeout: 5000 }).catch(() => null);
    if (await otpModal.isVisible().catch(() => false)) {
      await otpCodeInput.fill("000000");
      await otpSubmit.click();
    }
  }

  await expect(page.locator("#form-status")).toContainText("Заявка принята. Номер:");
  const statusText = await page.locator("#form-status").innerText();
  const match = statusText.match(/TRK-[A-Z0-9-]+/);
  if (!match) throw new Error("Track number not found in form status");

  return { trackNumber: match[0], phone, name };
}

async function openPublicCabinet(page, trackNumber) {
  const baseUrl = process.env.E2E_BASE_URL || "http://localhost:8081";
  await page.context().addCookies([
    {
      name: PUBLIC_COOKIE_NAME,
      value: createPublicViewCookieToken(String(trackNumber || "").trim().toUpperCase()),
      url: `${baseUrl}/`,
      httpOnly: true,
      sameSite: "Lax",
    },
  ]);
  await page.goto(`/client.html?track=${encodeURIComponent(trackNumber)}`);
  await expect(page.locator("#cabinet-summary")).toBeVisible();
  await expect(page.locator("#cabinet-request-status")).not.toHaveText("-");
}

async function sendCabinetMessage(page, text) {
  await page.locator("#cabinet-chat-body").fill(text);
  await page.locator("#cabinet-chat-send").click();
  await expect(page.locator("#client-page-status")).toContainText("Сообщение отправлено.");
  await expect(page.locator("#cabinet-messages")).toContainText(text);
}

async function uploadCabinetFile(page, fileName = "e2e.txt", bodyText = "E2E file") {
  let lastError = null;
  const mimeType = detectMimeForFixture(fileName);
  const buffer = mimeType === "application/pdf" ? buildTinyPdfBuffer(bodyText) : Buffer.from(bodyText, "utf-8");
  for (let attempt = 1; attempt <= 2; attempt += 1) {
    await page.locator("#cabinet-file-input").setInputFiles({
      name: fileName,
      mimeType,
      buffer,
    });
    await page.locator("#cabinet-chat-send").click();

    try {
      await expect(page.locator("#client-page-status")).toContainText("Файл загружен.", { timeout: 20_000 });
      lastError = null;
      break;
    } catch (error) {
      lastError = error;
      await page.waitForTimeout(500);
    }
  }
  if (lastError) throw lastError;
  const filesTab = page.getByRole("tab", { name: /Файлы/ });
  if (await filesTab.count()) {
    await filesTab.click();
  }
  await expect(page.locator("#cabinet-files")).toContainText(fileName);
}

async function loginAdminPanel(page, creds) {
  await page.goto("/admin");
  await expect(page.getByRole("heading", { name: "Панель администратора" })).toBeVisible();

  let loginVisible = false;
  const startedAt = Date.now();
  while (Date.now() - startedAt < 15_000) {
    loginVisible = await page.locator("#login-email").isVisible().catch(() => false);
    if (loginVisible) break;
    const badge = (await page.locator(".badge").first().textContent().catch(() => "")) || "";
    if (badge && !badge.includes("роль: -")) break;
    await page.waitForTimeout(200);
  }

  if (loginVisible) {
    await page.locator("#login-email").fill(creds.email);
    await page.locator("#login-password").fill(creds.password);
    await page.getByRole("button", { name: "Войти" }).click();
  }

  await expect(page.getByRole("heading", { name: "Панель администратора" })).toBeVisible();
}

async function openRequestsSection(page) {
  await page.locator("aside .menu button[data-section='requests']").click();
  await expect(page.locator("#section-requests h2")).toHaveText("Заявки");
}

function rowByTrack(page, sectionSelector, trackNumber) {
  return page.locator(`${sectionSelector} table tbody tr`).filter({ hasText: trackNumber });
}

async function openDictionaryTree(page) {
  const treeButton = page.locator("aside .menu button", { hasText: "Справочники" }).first();
  await treeButton.click();
  const afterFirstClick = await treeButton.innerText();
  if (afterFirstClick.includes("▸")) {
    await treeButton.click();
  }
  await expect(page.locator("#section-config h2")).toHaveText("Справочники");
  await expect(treeButton).toContainText("▾");
  await expect.poll(async () => page.locator("aside .menu .menu-tree button").count(), { timeout: 30_000 }).toBeGreaterThan(0);
}

async function selectDictionaryNode(page, label) {
  await page.locator("aside .menu .menu-tree").getByRole("button", { name: label, exact: true }).click();
  await expect(page.locator("#section-config .config-panel h3")).toContainText(label);
}

module.exports = {
  randomPhone,
  createCleanupTracker,
  trackCleanupPhone,
  trackCleanupTrack,
  trackCleanupEmail,
  cleanupTrackedTestData,
  preparePublicSession,
  createRequestViaLanding,
  openPublicCabinet,
  sendCabinetMessage,
  uploadCabinetFile,
  loginAdminPanel,
  openRequestsSection,
  rowByTrack,
  openDictionaryTree,
  selectDictionaryNode,
  buildTinyPdfBuffer,
};