/**
 * Newsletter Subscription Component
 * Reusable modal for newsletter subscriptions across the website
 */

class TractausNewsletter {
  constructor() {
    this.isOpen = false;
    this.isMobile = window.matchMedia('(max-width: 768px)').matches;
    this.csrfToken = null;
    this.init();
  }

  async init() {
    this.renderModal();
    this.attachEventListeners();
    await this.fetchCsrfToken();
  }

  async fetchCsrfToken() {
    try {
      const response = await fetch('/api/csrf-token');
      const data = await response.json();
      this.csrfToken = data.csrfToken;
    } catch (error) {
      console.error('[Newsletter] Failed to fetch CSRF token:', error);
    }
  }

  renderModal() {
    const modalHTML = `
      <div id="newsletter-modal" class="hidden fixed inset-0 z-50" role="dialog" aria-modal="true">
        <div id="newsletter-backdrop" class="absolute inset-0 bg-gray-900/60 backdrop-blur-sm"></div>

        <div class="absolute inset-0 flex items-center justify-center p-4">
          <div class="bg-white rounded-xl shadow-2xl w-full max-w-lg relative">
            <button id="newsletter-close"
                    class="absolute top-4 right-4 text-gray-400 hover:text-gray-600 transition-colors"
                    aria-label="Close newsletter modal">
              <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>

            <!-- Form Step -->
            <div id="newsletter-form-step" class="p-8">
              <div class="text-center mb-6">
                <div class="inline-flex items-center justify-center w-16 h-16 bg-blue-100 rounded-full mb-4">
                  <svg class="w-8 h-8 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
                  </svg>
                </div>
                <h2 class="text-2xl font-bold text-gray-900 mb-2">Stay Connected</h2>
                <p class="text-gray-600">
                  Get updates on AI governance research, framework developments, and implementation insights.
                  Choose what matters to you.
                </p>
              </div>

              <form id="newsletter-form" class="space-y-4">
                <div>
                  <label for="newsletter-email" class="block text-sm font-medium text-gray-700 mb-1">
                    Email Address <span class="text-red-500">*</span>
                  </label>
                  <input
                    type="email"
                    id="newsletter-email"
                    name="email"
                    required
                    placeholder="your.email@example.com"
                    class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                  />
                </div>

                <div>
                  <label for="newsletter-name" class="block text-sm font-medium text-gray-700 mb-1">
                    Name (Optional)
                  </label>
                  <input
                    type="text"
                    id="newsletter-name"
                    name="name"
                    placeholder="Your name"
                    class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                  />
                </div>

                <div>
                  <label class="block text-sm font-medium text-gray-700 mb-2">
                    Interests (Select all that apply)
                  </label>
                  <div class="space-y-2">
                    <label class="flex items-start cursor-pointer">
                      <input type="checkbox" name="interest" value="research" checked
                             class="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500" />
                      <span class="ml-2 text-sm text-gray-700">
                        Research Updates <em class="text-gray-500">(monthly)</em>
                      </span>
                    </label>
                    <label class="flex items-start cursor-pointer">
                      <input type="checkbox" name="interest" value="implementation"
                             class="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500" />
                      <span class="ml-2 text-sm text-gray-700">
                        Implementation Notes <em class="text-gray-500">(bi-weekly)</em>
                      </span>
                    </label>
                    <label class="flex items-start cursor-pointer">
                      <input type="checkbox" name="interest" value="governance"
                             class="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500" />
                      <span class="ml-2 text-sm text-gray-700">
                        Governance Discussions <em class="text-gray-500">(sporadic)</em>
                      </span>
                    </label>
                    <label class="flex items-start cursor-pointer">
                      <input type="checkbox" name="interest" value="project-updates"
                             class="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500" />
                      <span class="ml-2 text-sm text-gray-700">
                        Project Updates <em class="text-gray-500">(quarterly)</em>
                      </span>
                    </label>
                  </div>
                </div>

                <button type="submit" class="w-full bg-blue-600 text-white py-3 px-4 rounded-lg font-semibold hover:bg-blue-700 transition-colors">
                  Subscribe
                </button>

                <p class="text-xs text-center text-gray-500">
                  We respect your privacy. Unsubscribe anytime. No spam, ever.
                </p>
              </form>
            </div>

            <!-- Success Step -->
            <div id="newsletter-success-step" class="hidden p-8 text-center">
              <div class="inline-flex items-center justify-center w-16 h-16 bg-green-100 rounded-full mb-4">
                <svg class="w-8 h-8 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7" />
                </svg>
              </div>
              <h2 class="text-2xl font-bold text-gray-900 mb-2">You're All Set!</h2>
              <p class="text-gray-600 mb-6">
                Thanks for subscribing! You'll receive updates based on your interests.
                Watch your inbox for our next update.
              </p>
              <button id="newsletter-done-btn" class="bg-gray-200 text-gray-800 py-2 px-6 rounded-lg font-semibold hover:bg-gray-300 transition-colors">
                Done
              </button>
            </div>

            <!-- Error Step -->
            <div id="newsletter-error-step" class="hidden p-8 text-center">
              <div class="inline-flex items-center justify-center w-16 h-16 bg-red-100 rounded-full mb-4">
                <svg class="w-8 h-8 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
                </svg>
              </div>
              <h2 class="text-2xl font-bold text-gray-900 mb-2">Something Went Wrong</h2>
              <p id="newsletter-error-message" class="text-gray-600 mb-6">
                We couldn't process your subscription. Please try again.
              </p>
              <button id="newsletter-retry-btn" class="bg-gray-200 text-gray-800 py-2 px-6 rounded-lg font-semibold hover:bg-gray-300 transition-colors">
                Try Again
              </button>
            </div>
          </div>
        </div>
      </div>
    `;

    document.body.insertAdjacentHTML('beforeend', modalHTML);
  }

  attachEventListeners() {
    const modal = document.getElementById('newsletter-modal');
    const backdrop = document.getElementById('newsletter-backdrop');
    const closeBtn = document.getElementById('newsletter-close');
    const form = document.getElementById('newsletter-form');
    const doneBtn = document.getElementById('newsletter-done-btn');
    const retryBtn = document.getElementById('newsletter-retry-btn');

    // Close handlers
    backdrop.addEventListener('click', () => this.close());
    closeBtn.addEventListener('click', () => this.close());
    doneBtn.addEventListener('click', () => this.close());
    retryBtn.addEventListener('click', () => this.showStep('form'));

    // Form submission
    form.addEventListener('submit', (e) => {
      e.preventDefault();
      this.handleSubmit(e);
    });

    // Escape key to close
    document.addEventListener('keydown', (e) => {
      if (e.key === 'Escape' && this.isOpen) {
        this.close();
      }
    });

    // Global trigger - look for elements with data-newsletter-trigger
    document.addEventListener('click', (e) => {
      if (e.target.closest('[data-newsletter-trigger]')) {
        e.preventDefault();
        this.open();
      }
    });
  }

  open() {
    const modal = document.getElementById('newsletter-modal');
    modal.classList.remove('hidden');
    this.isOpen = true;
    document.body.classList.add('overflow-hidden');
    this.showStep('form');
  }

  close() {
    const modal = document.getElementById('newsletter-modal');
    modal.classList.add('hidden');
    this.isOpen = false;
    document.body.classList.remove('overflow-hidden');

    // Reset form
    const form = document.getElementById('newsletter-form');
    form.reset();

    // Re-check the research interest by default
    const researchCheckbox = form.querySelector('input[value="research"]');
    if (researchCheckbox) {
      researchCheckbox.checked = true;
    }
  }

  showStep(step) {
    const steps = {
      form: 'newsletter-form-step',
      success: 'newsletter-success-step',
      error: 'newsletter-error-step'
    };

    Object.values(steps).forEach(stepId => {
      const el = document.getElementById(stepId);
      if (el) el.classList.add('hidden');
    });

    const targetStep = document.getElementById(steps[step]);
    if (targetStep) {
      targetStep.classList.remove('hidden');
    }
  }

  async handleSubmit(e) {
    const form = e.target;
    const submitBtn = form.querySelector('button[type="submit"]');
    const originalBtnText = submitBtn.textContent;

    try {
      // Disable submit button
      submitBtn.disabled = true;
      submitBtn.textContent = 'Subscribing...';

      // Collect form data
      const formData = new FormData(form);
      const email = formData.get('email');
      const name = formData.get('name');
      const interestCheckboxes = form.querySelectorAll('input[name="interest"]:checked');
      const interests = Array.from(interestCheckboxes).map(cb => cb.value);

      // Prepare request data
      const data = {
        email,
        name: name || undefined,
        source: window.location.pathname,
        interests
      };

      // Submit to API
      const response = await fetch('/api/newsletter/subscribe', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-CSRF-Token': this.csrfToken
        },
        credentials: 'include',
        body: JSON.stringify(data)
      });

      const result = await response.json();

      if (response.ok && result.success) {
        this.showStep('success');
      } else {
        throw new Error(result.error || 'Subscription failed');
      }

    } catch (error) {
      console.error('[Newsletter] Subscription error:', error);
      const errorMsg = document.getElementById('newsletter-error-message');
      errorMsg.textContent = error.message || 'We couldn\'t process your subscription. Please try again.';
      this.showStep('error');
    } finally {
      submitBtn.disabled = false;
      submitBtn.textContent = originalBtnText;
    }
  }
}

// Auto-initialize when DOM is ready
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', () => {
    window.tractausNewsletter = new TractausNewsletter();
  });
} else {
  window.tractausNewsletter = new TractausNewsletter();
}