// ═══════════════════════════════════════════════
// A2P Compliance Wizard - Form Handler
// ═══════════════════════════════════════════════

document.addEventListener('DOMContentLoaded', () => {
  const form = document.getElementById('wizardForm');
  const submitBtn = document.getElementById('submitBtn');
  const overlay = document.getElementById('loadingOverlay');
  const errorBanner = document.getElementById('errorBanner');
  const logoInput = document.getElementById('logoInput');
  const logoUpload = document.querySelector('.logo-upload');
  const logoPreview = document.getElementById('logoPreview');
  const logoUploadText = document.querySelector('.logo-upload-text');

  // Logo upload preview
  logoUpload.addEventListener('click', () => logoInput.click());
  logoUpload.addEventListener('dragover', (e) => {
    e.preventDefault();
    logoUpload.style.borderColor = '#2563EB';
    logoUpload.style.background = '#EFF6FF';
  });
  logoUpload.addEventListener('dragleave', () => {
    logoUpload.style.borderColor = '';
    logoUpload.style.background = '';
  });
  logoUpload.addEventListener('drop', (e) => {
    e.preventDefault();
    logoUpload.style.borderColor = '';
    logoUpload.style.background = '';
    if (e.dataTransfer.files.length) {
      logoInput.files = e.dataTransfer.files;
      handleLogoSelect();
    }
  });

  logoInput.addEventListener('change', handleLogoSelect);

  function handleLogoSelect() {
    const file = logoInput.files[0];
    if (!file) return;

    if (!file.type.startsWith('image/')) {
      showError('Please upload an image file (PNG, JPG, SVG, WebP)');
      return;
    }

    if (file.size > 5 * 1024 * 1024) {
      showError('Logo must be under 5MB');
      return;
    }

    const reader = new FileReader();
    reader.onload = (e) => {
      logoPreview.src = e.target.result;
      logoPreview.style.display = 'block';
      logoUpload.classList.add('has-file');
      logoUploadText.textContent = file.name;
    };
    reader.readAsDataURL(file);
  }

  // Form submission
  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    hideError();

    // Validate
    if (!validateForm()) return;

    // Show loading
    overlay.classList.add('active');
    submitBtn.disabled = true;
    updateProgress(0, 'Preparing your request...');

    try {
      const formData = new FormData(form);

      // Simulate progress during generation
      const progressInterval = simulateProgress();

      const response = await fetch('/api/generate', {
        method: 'POST',
        body: formData,
      });

      clearInterval(progressInterval);

      const result = await response.json();

      if (!result.success) {
        throw new Error(result.error || 'Generation failed');
      }

      // Show completion
      updateProgress(100, 'Complete!');
      setStepDone(0);
      setStepDone(1);
      setStepDone(2);
      setStepDone(3);

      // Redirect to results
      setTimeout(() => {
        window.location.href = result.resultsUrl;
      }, 800);

    } catch (err) {
      overlay.classList.remove('active');
      submitBtn.disabled = false;
      showError(err.message || 'Something went wrong. Please try again.');
    }
  });

  function validateForm() {
    const required = ['agencyName', 'agencyEmail', 'businessName', 'businessAddress', 'businessEmail', 'businessPhone', 'businessDescription'];
    
    for (const field of required) {
      const input = form.querySelector(`[name="${field}"]`);
      if (!input || !input.value.trim()) {
        showError(`Please fill in all required fields`);
        input?.focus();
        return false;
      }
    }

    // Validate email
    const email = form.querySelector('[name="agencyEmail"]').value;
    if (!email.includes('@') || !email.includes('.')) {
      showError('Please enter a valid email address');
      return false;
    }

    // Validate checkbox
    const checkbox = form.querySelector('[name="tcpaConsent"]');
    if (!checkbox || !checkbox.checked) {
      showError('Please confirm TCPA compliance to continue');
      return false;
    }

    return true;
  }

  function simulateProgress() {
    let progress = 0;
    const steps = [
      { at: 10, msg: 'Generating AI content...' },
      { at: 45, msg: 'Building website pages...' },
      { at: 65, msg: 'Taking screenshots...' },
      { at: 85, msg: 'Assembling compliance packet...' },
    ];
    let stepIndex = 0;

    return setInterval(() => {
      if (progress < 90) {
        progress += Math.random() * 3 + 0.5;
        progress = Math.min(progress, 92);
        updateProgress(progress);

        if (stepIndex < steps.length && progress >= steps[stepIndex].at) {
          setStepActive(stepIndex);
          if (stepIndex > 0) setStepDone(stepIndex - 1);
          document.querySelector('.loading-message').textContent = steps[stepIndex].msg;
          stepIndex++;
        }
      }
    }, 500);
  }

  function updateProgress(pct, msg) {
    const fill = document.querySelector('.progress-fill');
    if (fill) fill.style.width = `${pct}%`;
    if (msg) {
      const el = document.querySelector('.loading-message');
      if (el) el.textContent = msg;
    }
  }

  function setStepActive(index) {
    const steps = document.querySelectorAll('.progress-step');
    if (steps[index]) {
      steps[index].classList.remove('done');
      steps[index].classList.add('active');
    }
  }

  function setStepDone(index) {
    const steps = document.querySelectorAll('.progress-step');
    if (steps[index]) {
      steps[index].classList.remove('active');
      steps[index].classList.add('done');
      const icon = steps[index].querySelector('.progress-step-icon');
      if (icon) icon.innerHTML = '<svg width="20" height="20" fill="none" stroke="currentColor" stroke-width="2.5" viewBox="0 0 24 24"><path d="M20 6L9 17l-5-5"/></svg>';
    }
  }

  function showError(msg) {
    errorBanner.textContent = msg;
    errorBanner.classList.add('visible');
    errorBanner.scrollIntoView({ behavior: 'smooth', block: 'center' });
  }

  function hideError() {
    errorBanner.classList.remove('visible');
  }
});