/**
 * Koha Donation System
 * Handles donation form functionality with CSP compliance
 */

// Form state
let selectedFrequency = 'monthly';
let selectedTier = '15';
let selectedAmount = 1500; // in cents (NZD)
let currentCurrency = typeof detectUserCurrency === 'function' ? detectUserCurrency() : 'NZD';

document.addEventListener('DOMContentLoaded', function() {
  // Initialize event listeners
  initializeFrequencyButtons();
  initializeTierCards();
  initializePublicAcknowledgement();
  initializeDonationForm();
});

/**
 * Initialize frequency selection buttons
 */
function initializeFrequencyButtons() {
  const monthlyBtn = document.getElementById('freq-monthly');
  const onetimeBtn = document.getElementById('freq-onetime');

  if (monthlyBtn) {
    monthlyBtn.addEventListener('click', function() {
      selectFrequency('monthly');
    });
  }

  if (onetimeBtn) {
    onetimeBtn.addEventListener('click', function() {
      selectFrequency('one_time');
    });
  }
}

/**
 * Initialize tier card click handlers
 */
function initializeTierCards() {
  const tierCards = document.querySelectorAll('[data-tier]');

  tierCards.forEach(card => {
    card.addEventListener('click', function() {
      const tier = this.dataset.tier;
      const amount = parseInt(this.dataset.amount);
      selectTier(tier, amount);
    });
  });
}

/**
 * Initialize public acknowledgement checkbox
 */
function initializePublicAcknowledgement() {
  const checkbox = document.getElementById('public-acknowledgement');

  if (checkbox) {
    checkbox.addEventListener('change', togglePublicName);
  }
}

/**
 * Initialize donation form submission
 */
function initializeDonationForm() {
  const form = document.getElementById('donation-form');

  if (form) {
    form.addEventListener('submit', handleFormSubmit);
  }
}

/**
 * Update prices when currency changes
 */
window.updatePricesForCurrency = function(currency) {
  currentCurrency = currency;

  if (typeof getTierPrices !== 'function' || typeof formatCurrency !== 'function') {
    console.warn('Currency utilities not loaded');
    return;
  }

  const prices = getTierPrices(currency);

  // Update tier card prices
  const tierCards = document.querySelectorAll('.tier-card');
  if (tierCards[0]) {
    const priceEl = tierCards[0].querySelector('.text-4xl');
    const currencyEl = tierCards[0].querySelector('.text-sm.text-gray-500');
    if (priceEl) priceEl.textContent = formatCurrency(prices.tier_5, currency).replace(/\.\d+$/, '');
    if (currencyEl) currencyEl.textContent = `${currency} / month`;
  }

  if (tierCards[1]) {
    const priceEl = tierCards[1].querySelector('.text-4xl');
    const currencyEl = tierCards[1].querySelector('.text-sm.text-gray-500');
    if (priceEl) priceEl.textContent = formatCurrency(prices.tier_15, currency).replace(/\.\d+$/, '');
    if (currencyEl) currencyEl.textContent = `${currency} / month`;
  }

  if (tierCards[2]) {
    const priceEl = tierCards[2].querySelector('.text-4xl');
    const currencyEl = tierCards[2].querySelector('.text-sm.text-gray-500');
    if (priceEl) priceEl.textContent = formatCurrency(prices.tier_50, currency).replace(/\.\d+$/, '');
    if (currencyEl) currencyEl.textContent = `${currency} / month`;
  }

  // Update custom amount placeholder
  const amountInput = document.getElementById('amount-input');
  if (amountInput) {
    amountInput.placeholder = 'Enter amount';
    const amountCurrencyLabel = amountInput.nextElementSibling;
    if (amountCurrencyLabel) {
      amountCurrencyLabel.textContent = currency;
    }
  }

  // Update help text
  const amountHelp = document.getElementById('amount-help');
  if (amountHelp && typeof formatCurrency === 'function') {
    amountHelp.textContent = `Minimum donation: ${formatCurrency(100, currency)}`;
  }
};

/**
 * Select donation frequency (monthly or one-time)
 */
function selectFrequency(freq) {
  selectedFrequency = freq;

  // Update button styles
  const monthlyBtn = document.getElementById('freq-monthly');
  const onetimeBtn = document.getElementById('freq-onetime');

  if (freq === 'monthly') {
    monthlyBtn.className = 'flex-1 py-3 px-6 border-2 border-blue-600 bg-blue-600 text-white rounded-lg font-semibold hover:bg-blue-700 transition';
    onetimeBtn.className = 'flex-1 py-3 px-6 border-2 border-gray-300 bg-white text-gray-700 rounded-lg font-semibold hover:border-blue-600 transition';

    // Show tier selection, hide custom amount
    const tierSelection = document.getElementById('tier-selection');
    const customAmount = document.getElementById('custom-amount');
    if (tierSelection) tierSelection.classList.remove('hidden');
    if (customAmount) customAmount.classList.add('hidden');
  } else {
    monthlyBtn.className = 'flex-1 py-3 px-6 border-2 border-gray-300 bg-white text-gray-700 rounded-lg font-semibold hover:border-blue-600 transition';
    onetimeBtn.className = 'flex-1 py-3 px-6 border-2 border-blue-600 bg-blue-600 text-white rounded-lg font-semibold hover:bg-blue-700 transition';

    // Hide tier selection, show custom amount
    const tierSelection = document.getElementById('tier-selection');
    const customAmount = document.getElementById('custom-amount');
    if (tierSelection) tierSelection.classList.add('hidden');
    if (customAmount) customAmount.classList.remove('hidden');

    const amountInput = document.getElementById('amount-input');
    if (amountInput) amountInput.focus();
  }
}

/**
 * Select tier amount
 */
function selectTier(tier, amountNZDCents) {
  selectedTier = tier;

  // Calculate amount in current currency
  if (typeof getTierPrices === 'function') {
    const prices = getTierPrices(currentCurrency);
    selectedAmount = prices[`tier_${tier}`];
  } else {
    selectedAmount = amountNZDCents;
  }

  // Update card styles
  const cards = document.querySelectorAll('.tier-card');
  cards.forEach(card => {
    card.classList.remove('selected');
  });

  // Add selected class to clicked card
  const selectedCard = document.querySelector(`[data-tier="${tier}"]`);
  if (selectedCard) {
    selectedCard.classList.add('selected');
  }
}

/**
 * Toggle public name field visibility
 */
function togglePublicName() {
  const checkbox = document.getElementById('public-acknowledgement');
  const nameField = document.getElementById('public-name-field');

  if (checkbox && nameField) {
    if (checkbox.checked) {
      nameField.classList.remove('hidden');
      const publicNameInput = document.getElementById('public-name');
      if (publicNameInput) publicNameInput.focus();
    } else {
      nameField.classList.add('hidden');
    }
  }
}

/**
 * Handle form submission
 */
async function handleFormSubmit(e) {
  e.preventDefault();

  const submitBtn = e.target.querySelector('button[type="submit"]');
  submitBtn.disabled = true;
  submitBtn.textContent = 'Processing...';

  try {
    // Get form data
    const donorName = document.getElementById('donor-name').value.trim() || 'Anonymous';
    const donorEmail = document.getElementById('donor-email').value.trim();
    const donorCountry = document.getElementById('donor-country').value.trim();
    const publicAck = document.getElementById('public-acknowledgement').checked;
    const publicName = document.getElementById('public-name').value.trim();

    // Validate email
    if (!donorEmail) {
      alert('Please enter your email address.');
      submitBtn.disabled = false;
      submitBtn.textContent = 'Proceed to Secure Payment';
      return;
    }

    // Get amount
    let amount;
    if (selectedFrequency === 'monthly') {
      amount = selectedAmount;
    } else {
      const customAmount = parseFloat(document.getElementById('amount-input').value);
      if (!customAmount || customAmount < 1) {
        const minAmount = typeof formatCurrency === 'function'
          ? formatCurrency(100, currentCurrency)
          : `${currentCurrency} 1.00`;
        alert(`Please enter a donation amount of at least ${minAmount}.`);
        submitBtn.disabled = false;
        submitBtn.textContent = 'Proceed to Secure Payment';
        return;
      }
      amount = Math.round(customAmount * 100); // Convert to cents
    }

    // Create checkout session
    const response = await fetch('/api/koha/checkout', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        amount: amount,
        currency: currentCurrency,
        frequency: selectedFrequency,
        tier: selectedFrequency === 'monthly' ? selectedTier : 'custom',
        donor: {
          name: donorName,
          email: donorEmail,
          country: donorCountry
        },
        public_acknowledgement: publicAck,
        public_name: publicAck ? (publicName || donorName) : null
      })
    });

    const data = await response.json();

    if (data.success && data.data.checkoutUrl) {
      // Redirect to Stripe Checkout
      window.location.href = data.data.checkoutUrl;
    } else {
      throw new Error(data.error || 'Failed to create checkout session');
    }

  } catch (error) {
    console.error('Donation error:', error);
    alert('An error occurred while processing your donation. Please try again or contact support.');
    submitBtn.disabled = false;
    submitBtn.textContent = 'Proceed to Secure Payment';
  }
}

/**
 * Initialize manage subscription functionality
 */
document.addEventListener('DOMContentLoaded', function() {
  const manageBtn = document.getElementById('manage-subscription-btn');
  const emailInput = document.getElementById('manage-email');

  if (manageBtn && emailInput) {
    manageBtn.addEventListener('click', handleManageSubscription);
    emailInput.addEventListener('keypress', function(e) {
      if (e.key === 'Enter') {
        e.preventDefault();
        handleManageSubscription();
      }
    });
  }
});

/**
 * Handle manage subscription button click
 */
async function handleManageSubscription() {
  const emailInput = document.getElementById('manage-email');
  const manageBtn = document.getElementById('manage-subscription-btn');
  const errorDiv = document.getElementById('manage-error');
  const loadingDiv = document.getElementById('manage-loading');

  const email = emailInput.value.trim();

  // Validate email
  if (!email) {
    showManageError('Please enter your email address.');
    emailInput.focus();
    return;
  }

  if (!isValidEmail(email)) {
    showManageError('Please enter a valid email address.');
    emailInput.focus();
    return;
  }

  // Hide error, show loading
  hideManageError();
  showManageLoading();
  manageBtn.disabled = true;

  try {
    const response = await fetch('/api/koha/portal', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ email })
    });

    const data = await response.json();

    if (data.success && data.data.url) {
      // Redirect to Stripe Customer Portal
      window.location.href = data.data.url;
    } else if (response.status === 404) {
      showManageError('No subscription found for this email address. Please check your email and try again.');
      manageBtn.disabled = false;
      hideManageLoading();
    } else {
      throw new Error(data.error || 'Failed to access subscription portal');
    }

  } catch (error) {
    console.error('Manage subscription error:', error);
    showManageError('An error occurred. Please try again or contact support@agenticgovernance.digital');
    manageBtn.disabled = false;
    hideManageLoading();
  }
}

/**
 * Validate email format
 */
function isValidEmail(email) {
  const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  return re.test(email);
}

/**
 * Show error message
 */
function showManageError(message) {
  const errorDiv = document.getElementById('manage-error');
  if (errorDiv) {
    errorDiv.textContent = message;
    errorDiv.classList.remove('hidden');
  }
}

/**
 * Hide error message
 */
function hideManageError() {
  const errorDiv = document.getElementById('manage-error');
  if (errorDiv) {
    errorDiv.classList.add('hidden');
  }
}

/**
 * Show loading indicator
 */
function showManageLoading() {
  const loadingDiv = document.getElementById('manage-loading');
  if (loadingDiv) {
    loadingDiv.classList.remove('hidden');
  }
}

/**
 * Hide loading indicator
 */
function hideManageLoading() {
  const loadingDiv = document.getElementById('manage-loading');
  if (loadingDiv) {
    loadingDiv.classList.add('hidden');
  }
}