// content.js - Handles job extraction and login automation for app.andela.com

console.log('[Andela Content Script] Loaded on', window.location.href);

function isLoginPage() {
  var emailInput = document.querySelector('input[type="email"]#email');
  var emailLabel = document.querySelector('label[for="email"]');
  var hasLoginForm = !!(emailInput && emailLabel);
  var isLoginUrl = window.location.pathname.indexOf('/login') === 0;

  console.log(
    '[Andela Content Script] Login check - hasForm:',
    hasLoginForm,
    'isLoginUrl:',
    isLoginUrl,
  );
  return hasLoginForm || (isLoginUrl && !!emailInput);
}

function enterEmailAndClickLogin(email) {
  try {
    console.log('[Andela Content Script] Attempting to enter email:', email);

    var emailInput = document.querySelector('input[type="email"]#email');
    if (!emailInput) {
      console.log('[Andela Content Script] Email input not found');
      return false;
    }

    emailInput.focus();
    emailInput.value = email;
    emailInput.dispatchEvent(new Event('input', { bubbles: true }));
    emailInput.dispatchEvent(new Event('change', { bubbles: true }));
    emailInput.dispatchEvent(new KeyboardEvent('keyup', { bubbles: true }));

    console.log(
      '[Andela Content Script] Email entered, looking for submit button...',
    );

    setTimeout(function () {
      var submitButton = document.querySelector('button[type="submit"]');

      if (!submitButton) {
        var buttons = document.querySelectorAll('button');
        for (var i = 0; i < buttons.length; i++) {
          var btnText = buttons[i].textContent.toLowerCase();
          if (
            btnText.indexOf('login') !== -1 ||
            btnText.indexOf('sign in') !== -1 ||
            btnText.indexOf('continue') !== -1 ||
            btnText.indexOf('submit') !== -1
          ) {
            submitButton = buttons[i];
            break;
          }
        }
      }

      if (submitButton) {
        console.log(
          '[Andela Content Script] Clicking submit button:',
          submitButton.textContent,
        );
        submitButton.click();
      } else {
        console.log(
          '[Andela Content Script] Submit button not found, trying form submit',
        );
        var form = emailInput.closest('form');
        if (form) {
          if (form.requestSubmit) form.requestSubmit();
          else form.submit();
        }
      }
    }, 500);

    return true;
  } catch (err) {
    console.error('[Andela Content Script] Error entering email:', err);
    return false;
  }
}

// A section counts as "opportunities" if its heading contains this word —
// matches "Open Full-Stack Engineer opportunities", "Open AI Engineer
// opportunities", etc. Anything else (e.g. "Your applications") is
// treated as already-applied.
function isOpportunitySection(headingText) {
  return /opportunit/i.test(headingText || '');
}

// Walks the page in DOM order and tags every "See more" button and every
// job-posting link with the heading text of the section it falls under.
function getPageSections() {
  var elements = document.querySelectorAll(
    'h3, button, a[href*="/job-postings/"]',
  );
  var currentHeading = '';
  var seeMoreButtons = []; // { button, heading }
  var jobLinks = []; // { link, heading }

  elements.forEach(function (el) {
    if (el.tagName === 'H3') {
      currentHeading = el.textContent.trim();
      console.log(
        '[Andela Content Script] Section heading found:',
        currentHeading,
      );
      return;
    }
    if (el.tagName === 'BUTTON') {
      var text = (el.textContent || '').trim().toLowerCase();
      if (text.indexOf('see') === 0 && text.indexOf('more') !== -1) {
        seeMoreButtons.push({ button: el, heading: currentHeading });
      }
      return;
    }
    if (el.tagName === 'A') {
      jobLinks.push({ link: el, heading: currentHeading });
    }
  });

  return { seeMoreButtons: seeMoreButtons, jobLinks: jobLinks };
}

// Only expands "See more" under opportunity sections — leaves the
// applied-jobs section collapsed as-is.
function expandAllSeeMoreButtons(maxRounds) {
  maxRounds = maxRounds || 25;
  return new Promise(function (resolve) {
    var rounds = 0;

    function findSeeMoreButton() {
      var sections = getPageSections();
      for (var i = 0; i < sections.seeMoreButtons.length; i++) {
        var entry = sections.seeMoreButtons[i];
        if (isOpportunitySection(entry.heading)) {
          return entry.button;
        }
      }
      return null;
    }

    function clickNext() {
      rounds++;
      var btn = findSeeMoreButton();
      if (!btn || rounds > maxRounds) {
        console.log(
          '[Andela Content Script] Done expanding opportunity "See more" buttons after',
          rounds - 1,
          'click(s)',
        );
        resolve();
        return;
      }
      console.log('[Andela Content Script] Clicking:', btn.textContent.trim());
      btn.click();
      setTimeout(clickNext, 700);
    }

    clickNext();
  });
}

function extractJobFromLink(link) {
  var href = link.getAttribute('href') || '';
  var idMatch = href.match(/\/job-postings\/(\d+)/);
  var id = idMatch ? idMatch[1] : href;

  var card =
    link.closest('div.rounded-lg.border.border-neutral-200.bg-white') ||
    link.parentElement;

  var title = '';
  var company = '';
  var titleEl = card
    ? card.querySelector('.text-primary-900.font-semibold')
    : null;

  if (titleEl) {
    var clone = titleEl.cloneNode(true);
    var companySpan = clone.querySelector('span.font-normal');
    if (companySpan) {
      company = companySpan.textContent.replace(/^[\s—-]+/, '').trim();
      companySpan.remove();
    }
    title = clone.textContent.trim();
  }

  var paragraphs = card ? card.querySelectorAll('p') : [];
  var startInfo = paragraphs[0] ? paragraphs[0].textContent.trim() : '';
  var locationInfo = paragraphs[1] ? paragraphs[1].textContent.trim() : '';

  var skillEls = card
    ? card.querySelectorAll('.flex.flex-wrap.gap-2 span')
    : [];
  var skills = Array.prototype.map.call(skillEls, function (s) {
    return s.textContent.trim();
  });

  var url = href;
  if (url && url.indexOf('http') !== 0) {
    url = window.location.origin + url;
  }

  return {
    id: id,
    title: title,
    company: company || 'Company',
    posted_date: startInfo || '',
    location: locationInfo || '',
    skills: skills,
    url: url,
  };
}

function extractJobsFromPage() {
  console.log('[Andela Content Script] Extracting jobs...');
  var jobs = [];
  var seen = {};
  var jobLinks = getPageSections().jobLinks;
  console.log(
    '[Andela Content Script] Found ' + jobLinks.length + ' job-posting links',
  );

  jobLinks.forEach(function (entry) {
    try {
      var job = extractJobFromLink(entry.link);
      if (!job.id || seen[job.id]) return;
      seen[job.id] = true;
      job.section = entry.heading;
      job.kind = isOpportunitySection(entry.heading)
        ? 'opportunity'
        : 'applied';
      if (job.title) {
        jobs.push(job);
        console.log(
          '[Andela Content Script] Extracted job:',
          job.title,
          '(' + job.id + ')',
          '-',
          job.kind,
        );
      }
    } catch (err) {
      console.error(
        '[Andela Content Script] Error extracting a job card:',
        err,
      );
    }
  });

  console.log(
    '[Andela Content Script] Extracted ' + jobs.length + ' jobs total',
  );
  return jobs;
}

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  console.log('[Andela Content Script] Received message:', request);

  if (request.action === 'extractJobs') {
    expandAllSeeMoreButtons().then(function () {
      setTimeout(function () {
        try {
          var jobs = extractJobsFromPage();
          sendResponse({ jobs: jobs });
        } catch (error) {
          console.error('[Andela Content Script] Error:', error);
          sendResponse({ jobs: [] });
        }
      }, 500);
    });
    return true;
  }

  if (request.action === 'checkLoginPage') {
    var result = isLoginPage();
    console.log('[Andela Content Script] Is login page:', result);
    sendResponse({ isLoginPage: result });
  }

  if (request.action === 'enterEmailAndLogin') {
    var success = enterEmailAndClickLogin(request.email);
    sendResponse({ success: success });
  }

  if (request.action === 'extractPostedDate') {
    var el = document.querySelector('span.text-success-500');
    var postedText = el ? el.textContent.trim() : '';
    console.log(
      '[Andela Content Script] Extracted posted date text:',
      postedText,
    );
    sendResponse({ postedDate: postedText });
  }

  return true;
});