// content.js - Handles job extraction, login automation, and profile
// title switching 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;
  return hasLoginForm || (isLoginUrl && !!emailInput);
}

function enterEmailAndClickLogin(email) {
  try {
    var emailInput = document.querySelector('input[type="email"]#email');
    if (!emailInput) 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 }));

    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 t = buttons[i].textContent.toLowerCase();
          if (
            t.indexOf('login') !== -1 ||
            t.indexOf('sign in') !== -1 ||
            t.indexOf('continue') !== -1 ||
            t.indexOf('submit') !== -1
          ) {
            submitButton = buttons[i];
            break;
          }
        }
      }
      if (submitButton) {
        submitButton.click();
      } else {
        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 || '');
}

function getPageSections() {
  var elements = document.querySelectorAll(
    'h3, button, a[href*="/job-postings/"]',
  );
  var currentHeading = '';
  var seeMoreButtons = [];
  var jobLinks = [];

  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 };
}

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) {
        resolve();
        return;
      }
      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() {
  var jobs = [];
  var seen = {};
  var jobLinks = getPageSections().jobLinks;

  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);
    } catch (err) {
      console.error(
        '[Andela Content Script] Error extracting a job card:',
        err,
      );
    }
  });

  return jobs;
}

// ============================================
// Profile title switching (used to surface jobs for other roles)
// ============================================

function getCurrentProfileTitle() {
  var el = document.querySelector('.text-primary-600.mt-0\\.5.text-sm');
  return el ? el.textContent.trim() : '';
}

function waitFor(conditionFn, timeoutMs, intervalMs) {
  timeoutMs = timeoutMs || 5000;
  intervalMs = intervalMs || 200;
  return new Promise(function (resolve) {
    var elapsed = 0;
    function check() {
      var result = conditionFn();
      if (result) {
        resolve(result);
        return;
      }
      elapsed += intervalMs;
      if (elapsed >= timeoutMs) {
        resolve(null);
        return;
      }
      setTimeout(check, intervalMs);
    }
    check();
  });
}

// Plain .click() doesn't reliably open this dropdown when dispatched
// programmatically — needs the full pointer-event sequence instead.
function dispatchFullClick(el) {
  el.focus();
  ['pointerdown', 'mousedown', 'pointerup', 'mouseup', 'click'].forEach(
    function (type) {
      el.dispatchEvent(
        new MouseEvent(type, { bubbles: true, cancelable: true, view: window }),
      );
    },
  );
}

async function setProfessionalTitle(title) {
  console.log(
    '[Andela Content Script] setProfessionalTitle: looking for edit button...',
  );
  var editBtn = await waitFor(function () {
    return document.querySelector('button[aria-label="Edit profile details"]');
  }, 6000);
  if (!editBtn) {
    console.log('[Andela Content Script] STEP FAILED: edit button not found');
    return false;
  }
  console.log(
    '[Andela Content Script] STEP OK: edit button found, clicking...',
  );
  editBtn.click();

  console.log(
    '[Andela Content Script] looking for professional_title input...',
  );
  var titleInput = await waitFor(function () {
    return document.querySelector('#professional_title');
  }, 5000);
  if (!titleInput) {
    console.log(
      '[Andela Content Script] STEP FAILED: professional_title input not found (modal may not have opened)',
    );
    return false;
  }
  console.log(
    '[Andela Content Script] STEP OK: input found, opening dropdown...',
  );
  dispatchFullClick(titleInput);

  console.log('[Andela Content Script] looking for option matching:', title);
  var optionEl = await waitFor(
    function () {
      var options = document.querySelectorAll('[role="option"]');
      for (var i = 0; i < options.length; i++) {
        var span = options[i].querySelector('span.col-start-2') || options[i];
        if (
          span &&
          span.textContent.trim().toLowerCase() === title.toLowerCase()
        ) {
          return options[i];
        }
      }
      return null;
    },
    5000,
    400,
  );
  if (!optionEl) {
    console.log(
      '[Andela Content Script] STEP FAILED: no option matched "' + title + '"',
    );
    return false;
  }
  console.log('[Andela Content Script] STEP OK: option found, clicking...');
  optionEl.click();

  await new Promise(function (r) {
    setTimeout(r, 400);
  });

  console.log('[Andela Content Script] looking for save button...');
  var saveBtn = document.querySelector(
    'button[type="submit"][form="edit-profile-details-form"]',
  );
  if (!saveBtn) {
    console.log('[Andela Content Script] STEP FAILED: save button not found');
    return false;
  }
  console.log(
    '[Andela Content Script] STEP OK: save button found, clicking...',
  );
  saveBtn.click();

  console.log('[Andela Content Script] waiting for modal to close...');
  var closed = await waitFor(function () {
    return !document.querySelector('#professional_title');
  }, 15000);

  console.log(
    '[Andela Content Script] setProfessionalTitle(' + title + ') closed modal:',
    !!closed,
  );
  return !!closed;
}

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

  if (request.action === 'checkLoginPage') {
    sendResponse({ isLoginPage: isLoginPage() });
    return true;
  }

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

  if (request.action === 'extractPostedDate') {
    var el = document.querySelector('span.text-success-500');
    sendResponse({ postedDate: el ? el.textContent.trim() : '' });
    return true;
  }

  if (request.action === 'getCurrentProfileTitle') {
    sendResponse({ title: getCurrentProfileTitle() });
    return true;
  }

  if (request.action === 'setProfessionalTitle') {
    setProfessionalTitle(request.title).then(function (success) {
      sendResponse({ success: success });
    });
    return true;
  }

  return true;
});