/**
 * SkySlope Forms Scraper — via Utah Real Estate SSO
 *
 * Flow: utahrealestate.com login → Forms → MLS Forms → SkySlope → download all library PDFs
 *
 * Run: npm run scrape:forms
 *
 * Credentials read from .env.local:
 *   URE_USERNAME    — Utah Real Estate username
 *   URE_PASSWORD    — Utah Real Estate password
 */

import { chromium } from 'playwright';
import * as fs from 'node:fs/promises';
import * as path from 'node:path';
import { config } from 'dotenv';

config({ path: path.resolve(process.cwd(), '.env.local') });

const URE_USERNAME = process.env.URE_USERNAME;
const URE_PASSWORD = process.env.URE_PASSWORD;
const OUTPUT_DIR = path.resolve(process.cwd(), 'seeds/forms');

if (!URE_USERNAME || !URE_PASSWORD) {
  console.error('Missing required env vars: URE_USERNAME, URE_PASSWORD');
  process.exit(1);
}

async function main() {
  await fs.mkdir(OUTPUT_DIR, { recursive: true });

  const browser = await chromium.launch({ headless: false });
  const savedState = await fs.readFile(path.resolve(process.cwd(), 'scripts/.ure-session.json'), 'utf8').then(JSON.parse).catch(() => null);
  const context = await browser.newContext({
    acceptDownloads: true,
    storageState: savedState ?? undefined,
  });
  const page = await context.newPage();

  // ── Step 1: Login to Utah Real Estate ─────────────────────────────────────
  console.log('Navigating to utahrealestate.com...');
  await page.goto('https://www.utahrealestate.com/auth/login', { waitUntil: 'domcontentloaded', timeout: 30_000 });
  await page.waitForTimeout(2000);

  console.log(`Login page URL: ${page.url()}`);
  await page.screenshot({ path: 'scripts/debug-ure-login.png' });

  const COOKIE_FILE = path.resolve(process.cwd(), 'scripts/.ure-session.json');

  // Only fill login form if we're actually on the login page
  if (page.url().includes('/auth/login') || page.url().includes('/login')) {
    const usernameInput = page.locator('input[name="username"], input[name="user"], input[id*="user"], input[placeholder*="user" i]').first();
    const passwordInput = page.locator('input[type="password"]').first();

    await usernameInput.waitFor({ timeout: 10_000 });
    await usernameInput.fill(URE_USERNAME!);
    await passwordInput.fill(URE_PASSWORD!);

    console.log('Credentials filled, submitting...');
    await page.locator('button[type="submit"], input[type="submit"], button:has-text("Login"), button:has-text("Sign In"), button:has-text("Log In")').first().click();
    await page.waitForLoadState('domcontentloaded');
    await page.waitForTimeout(3000);
  } else {
    console.log('Already logged in (session restored).');
  }

  console.log(`After login URL: ${page.url()}`);
  await page.screenshot({ path: 'scripts/debug-ure-after-login.png' });

  // ── Step 1b: Handle 2FA if present ────────────────────────────────────────
  const pageText = await page.locator('body').innerText().catch(() => '');
  if (pageText.includes('verification code') || pageText.includes('one-time')) {
    console.log('\n⚡ 2FA detected — please complete it in the browser window.');
    console.log('   (Select Text/Email, enter the code, and click Submit)');
    console.log('   Waiting up to 2 minutes for you to finish...\n');

    // Poll every 2s until 2FA page is gone (up to 2 minutes)
    const deadline = Date.now() + 120_000;
    while (Date.now() < deadline) {
      await page.waitForTimeout(2000);
      const text = await page.locator('body').innerText().catch(() => '');
      if (!text.includes('verification code') && !text.includes('one-time')) break;
      process.stdout.write('.');
    }
    console.log();
    await page.waitForLoadState('domcontentloaded');
    await page.waitForTimeout(2000);
    console.log(`After 2FA URL: ${page.url()}`);

    // Save session so we skip 2FA next time
    await context.storageState({ path: COOKIE_FILE });
    console.log('Session saved — 2FA will be skipped on next run.');
  }

  // ── Step 2: Navigate directly to SkySlope SSO URL ────────────────────────
  console.log('Navigating to SkySlope via SSO...');

  const [newPage] = await Promise.all([
    context.waitForEvent('page', { timeout: 15_000 }).catch(() => null),
    page.goto('https://www.utahrealestate.com/sso/connect/client/skyslope', { waitUntil: 'domcontentloaded' }),
  ]);

  // The SSO link opens a new tab
  const activePage = newPage ?? page;
  await activePage.waitForLoadState('domcontentloaded');
  await activePage.waitForTimeout(5000);
  console.log(`SkySlope URL: ${activePage.url()}`);
  await activePage.screenshot({ path: 'scripts/debug-skyslope-landing.png' });

  await downloadAllForms(activePage, context, OUTPUT_DIR);
  if (newPage) await newPage.close();

  await browser.close();
  console.log('\nDone.');
}

async function downloadAllForms(
  page: import('playwright').Page,
  context: import('playwright').BrowserContext,
  outputDir: string
) {
  const downloaded: string[] = [];
  const failed: string[] = [];

  // Handle NRDS auth if it appears
  await handleNRDSAuth(page);

  // Wait for forms library to load
  await page.waitForTimeout(4000);
  console.log(`Forms library URL: ${page.url()}`);

  // Navigate to Browse Libraries
  console.log('Clicking Browse Libraries...');
  const browseLink = page.locator('a:has-text("Browse Libraries"), a[href*="libraries"], nav a:has-text("Libraries")').first();
  if (await browseLink.isVisible({ timeout: 5_000 }).catch(() => false)) {
    await browseLink.click();
    await page.waitForLoadState('domcontentloaded');
    await page.waitForTimeout(3000);
  } else {
    await page.goto('https://forms.skyslope.com/libraries', { waitUntil: 'domcontentloaded' });
    await page.waitForTimeout(3000);
  }

  console.log(`Libraries URL: ${page.url()}`);
  await page.screenshot({ path: 'scripts/debug-libraries-page.png' });

  const bodyText2 = await page.locator('body').innerText().catch(() => '');
  console.log('Libraries page text (first 600):', bodyText2.slice(0, 600));

  // Find all library cards/links
  const libraryLinks = await page.locator(
    'a[href*="/library/"], a[href*="/libraries/"], [class*="library-card"], [class*="libraryCard"]'
  ).all();
  console.log(`Found ${libraryLinks.length} library links`);

  if (libraryLinks.length > 0) {
    const libraryHrefs: string[] = [];
    for (const link of libraryLinks) {
      const href = await link.getAttribute('href').catch(() => '');
      const name = await link.textContent().catch(() => '');
      if (href) {
        libraryHrefs.push(href);
        console.log(`  Library: ${name?.trim().slice(0, 50)} → ${href}`);
      }
    }

    for (const href of libraryHrefs) {
      const url = href.startsWith('http') ? href : `https://forms.skyslope.com${href}`;
      console.log(`\n── Opening library: ${url} ──`);
      await page.goto(url, { waitUntil: 'domcontentloaded' });
      await page.waitForTimeout(4000);
      await page.screenshot({ path: `scripts/debug-library-${Date.now()}.png` });
      await downloadFormsInView(page, context, outputDir, downloaded, failed);
    }
  } else {
    // Fallback: libraries might be listed as clickable items
    const bodyText = await page.locator('body').innerText().catch(() => '');
    const libraryNames = ['Data Forms - URE', 'Utah Association of Realtors', 'Utah CCIM'];

    for (const libName of libraryNames) {
      const libLink = page.locator(`a:has-text("${libName}"), button:has-text("${libName}")`).first();
      if (await libLink.isVisible({ timeout: 3_000 }).catch(() => false)) {
        console.log(`\n── Library: ${libName} ──`);
        await libLink.click();
        await page.waitForLoadState('domcontentloaded');
        await page.waitForTimeout(4000);
        await downloadFormsInView(page, context, outputDir, downloaded, failed);
        await page.goBack();
        await page.waitForTimeout(2000);
      }
    }

    if (libraryLinks.length === 0) {
      // We're already on the all-forms page — download directly
      console.log('All forms visible on current page — downloading...');
      await downloadFormsInView(page, context, outputDir, downloaded, failed);
    }
  }

  console.log(`\n✓ Downloaded ${downloaded.length} forms`);
  if (failed.length > 0) console.log(`✗ Failed: ${failed.length} — ${failed.join(', ')}`);
}

async function handleNRDSAuth(page: import('playwright').Page) {
  const LAST_NAME = process.env.SKYSLOPE_LAST_NAME || 'Copeland';
  const NRDS_ID = process.env.SKYSLOPE_NRDS_ID || '837075029';

  // Check if NRDS auth page appears
  const isNRDS = await page.locator('input[placeholder*="last" i], input[placeholder*="nrds" i]').first().isVisible({ timeout: 5_000 }).catch(() => false);
  if (!isNRDS) return;

  console.log('NRDS authorization required — filling...');
  const inputs = await page.locator('input').all();
  if (inputs.length >= 2) {
    await inputs[0].fill(LAST_NAME);
    await inputs[1].fill(NRDS_ID);
    await page.locator('button:has-text("Next"), button[type="submit"]').first().click();
    await page.waitForLoadState('domcontentloaded');
    await page.waitForTimeout(3000);
    console.log(`After NRDS URL: ${page.url()}`);
  }
}

async function downloadFormsInView(
  page: import('playwright').Page,
  context: import('playwright').BrowserContext,
  outputDir: string,
  downloaded: string[],
  failed: string[]
) {
  // Flow: click form name → preview opens → click Download button → save file

  // Extract form names from the page body text — the list renders as "Name\nAdd\nName\nAdd..."
  const bodyText = await page.locator('body').innerText().catch(() => '');
  const lines = bodyText.split('\n').map(l => l.trim()).filter(l => l.length > 3);
  const formNames: string[] = [];
  for (let i = 0; i < lines.length; i++) {
    if (lines[i] === 'Add' && i > 0 && lines[i - 1] !== 'Add' && lines[i - 1].length > 3) {
      formNames.push(lines[i - 1]);
    }
  }
  const names = [...new Set(formNames)];

  console.log(`  Found ${names.length} forms to download`);
  if (names.length === 0) {
    await page.screenshot({ path: `scripts/debug-no-forms-${Date.now()}.png` });
    return;
  }

  for (const formName of names) {
    const sanitized = formName.replace(/[^a-z0-9 ._-]/gi, ' ').replace(/\s+/g, ' ').trim().slice(0, 100);
    const destPath = path.join(outputDir, `${sanitized}.pdf`);

    // Skip already downloaded
    try { await fs.access(destPath); process.stdout.write(`  ⊙ skip: ${sanitized}\n`); continue; } catch { /* proceed */ }

    // Click the form name to open preview
    const nameEl = page.locator(`text="${formName}"`).first();
    if (!await nameEl.isVisible({ timeout: 3_000 }).catch(() => false)) {
      process.stdout.write(`  ⚠ not found: ${sanitized}\n`);
      failed.push(sanitized);
      continue;
    }

    await nameEl.click().catch(() => {});
    // Wait for preview/modal to appear (up to 5s)
    await page.waitForTimeout(2000);

    // Click Download button in the preview
    const downloadBtn = page.locator(
      'button:has-text("Download"), a:has-text("Download"), [aria-label*="download" i], button[title*="download" i]'
    ).first();

    if (!await downloadBtn.isVisible({ timeout: 5_000 }).catch(() => false)) {
      process.stdout.write(`  ⚠ no Download button found for: ${sanitized}\n`);
      await page.screenshot({ path: `scripts/debug-no-download-btn-${Date.now()}.png` });
      await page.keyboard.press('Escape').catch(() => {});
      await page.waitForTimeout(500);
      failed.push(sanitized);
      continue;
    }

    try {
      const [download] = await Promise.all([
        page.waitForEvent('download', { timeout: 20_000 }),
        downloadBtn.click(),
      ]);
      await download.saveAs(destPath);
      process.stdout.write(`  ✓ ${sanitized}.pdf\n`);
      downloaded.push(sanitized);
    } catch (err) {
      process.stdout.write(`  ✗ download failed: ${sanitized} — ${(err as Error).message.slice(0, 60)}\n`);
      failed.push(sanitized);
    }

    // Close preview and return to list
    await page.keyboard.press('Escape').catch(() => {});
    await page.waitForTimeout(800);
  }
}

async function downloadViaTextRows(
  page: import('playwright').Page,
  outputDir: string,
  downloaded: string[],
  failed: string[]
) {
  // Legacy fallback — kept for safety but downloadFormsInView handles all cases now
  console.log('  (downloadViaTextRows called — should not reach here normally)');
  const rows = await page.evaluate(() => {
    const candidates = Array.from(document.querySelectorAll('tr, li, [class*="row"], [class*="item"]'));
    return candidates
      .map(el => ({
        text: el.textContent?.replace(/\s+/g, ' ').trim() ?? '',
        hasAdd: el.textContent?.includes('Add') ?? false,
      }))
      .filter(r => r.hasAdd && r.text.length > 10)
      .map(r => r.text.replace(/\s*Add\s*$/, '').trim());
  });

  console.log(`  Found ${rows.length} form names via text extraction`);

  for (const formName of rows) {
    if (!formName || formName.length < 3) continue;
    const sanitized = formName.replace(/[^a-z0-9 ._-]/gi, ' ').replace(/\s+/g, ' ').trim().slice(0, 100);
    const destPath = path.join(outputDir, `${sanitized}.pdf`);

    try { await fs.access(destPath); process.stdout.write(`  ⊙ skip: ${sanitized}\n`); continue; } catch { /* proceed */ }

    const el = page.locator(`text="${formName}"`).first();
    if (!await el.isVisible({ timeout: 2_000 }).catch(() => false)) {
      process.stdout.write(`  ⚠ not visible: ${sanitized}\n`);
      continue;
    }

    const pdfUrl = await interceptPdfOnClick(page, el);
    if (pdfUrl) {
      try {
        const buf = await page.evaluate(async (url) => {
          const r = await fetch(url, { credentials: 'include' });
          const ab = await r.arrayBuffer();
          return Array.from(new Uint8Array(ab));
        }, pdfUrl);
        await fs.writeFile(destPath, Buffer.from(buf));
        process.stdout.write(`  ✓ ${sanitized}.pdf\n`);
        downloaded.push(sanitized);
      } catch {
        process.stdout.write(`  ✗ ${sanitized}\n`);
        failed.push(sanitized);
      }
    } else {
      process.stdout.write(`  ⚠ no PDF: ${sanitized}\n`);
      failed.push(sanitized);
    }

    await page.keyboard.press('Escape').catch(() => {});
    await page.waitForTimeout(500);
  }
}

async function interceptPdfOnClick(
  page: import('playwright').Page,
  row: import('playwright').Locator
): Promise<string | null> {
  return new Promise(async (resolve) => {
    let resolved = false;
    const handler = (response: import('playwright').Response) => {
      const ct = response.headers()['content-type'] ?? '';
      if (!resolved && (ct.includes('pdf') || response.url().endsWith('.pdf'))) {
        resolved = true;
        resolve(response.url());
      }
    };
    page.on('response', handler);
    await row.click({ timeout: 3_000 }).catch(() => {});
    await page.waitForTimeout(2000);
    page.off('response', handler);
    if (!resolved) resolve(null);
  });
}

main().catch(err => {
  console.error('Fatal:', err.message);
  process.exit(1);
});