// Verify MC Patient Intake Widget
// Production-grade, conversion-optimized form with AI assistance

(function() {
  'use strict';

  // State management
  const state = {
    formData: {},
    aiProcessing: false,
    sections: {
      personal: { fields: 5, filled: 0 },
      emergency: { fields: 3, filled: 0 },
      insurance: { fields: 4, filled: 0 },
      medical: { fields: 4, filled: 0 },
      visit: { fields: 2, filled: 0 }
    },
    totalFields: 18,
    filledFields: 0
  };

  // Initialize
  document.addEventListener('DOMContentLoaded', init);

  function init() {
    loadSavedData();
    attachEventListeners();
    updateProgress();
    initializePhoneFormatting();
  }

  // Event Listeners
  function attachEventListeners() {
    const form = document.getElementById('intakeForm');
    const inputs = form.querySelectorAll('input, select, textarea');

    inputs.forEach(input => {
      // Real-time validation and progress
      input.addEventListener('blur', () => validateField(input));
      input.addEventListener('input', () => {
        updateFieldStatus(input);
        debouncedProgressUpdate();
      });
      
      // AI suggestion on focus for certain fields
      if (input.name === 'symptoms' || input.name === 'medications') {
        input.addEventListener('focus', () => showAIHint(input));
      }
    });

    // Enter key in AI input
    document.getElementById('aiInput').addEventListener('keypress', (e) => {
      if (e.key === 'Enter') processAIInput();
    });

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

  // Phone number formatting
  function initializePhoneFormatting() {
    const phoneInputs = document.querySelectorAll('input[type="tel"]');
    phoneInputs.forEach(input => {
      input.addEventListener('input', (e) => {
        let value = e.target.value.replace(/\D/g, '');
        if (value.length >= 6) {
          value = `(${value.slice(0, 3)}) ${value.slice(3, 6)}-${value.slice(6, 10)}`;
        } else if (value.length >= 3) {
          value = `(${value.slice(0, 3)}) ${value.slice(3)}`;
        }
        e.target.value = value;
      });
    });
  }

  // Field validation
  function validateField(input) {
    const isRequired = input.hasAttribute('required');
    const isEmpty = !input.value.trim();
    
    if (isRequired && isEmpty) {
      input.classList.add('error');
      showFieldError(input, 'This field is required');
    } else if (input.type === 'email' && input.value && !isValidEmail(input.value)) {
      input.classList.add('error');
      showFieldError(input, 'Please enter a valid email');
    } else {
      input.classList.remove('error');
      clearFieldError(input);
    }
  }

  function isValidEmail(email) {
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
  }

  function showFieldError(input, message) {
    clearFieldError(input);
    const error = document.createElement('p');
    error.className = 'field-error text-verify-error text-xs mt-1.5 flex items-center gap-1';
    error.innerHTML = `<i data-lucide="alert-circle" class="w-3 h-3"></i>${message}`;
    input.parentNode.appendChild(error);
    lucide.createIcons();
  }

  function clearFieldError(input) {
    const existing = input.parentNode.querySelector('.field-error');
    if (existing) existing.remove();
  }

  // Progress tracking
  function updateFieldStatus(input) {
    const section = input.dataset.section;
    if (!section) return;

    const isFilled = input.type === 'checkbox' 
      ? input.checked 
      : input.value.trim().length > 0;

    state.formData[input.name] = isFilled ? input.value : null;
    
    // Auto-save to localStorage
    debouncedSave();
  }

  let progressDebounceTimer;
  function debouncedProgressUpdate() {
    clearTimeout(progressDebounceTimer);
    progressDebounceTimer = setTimeout(updateProgress, 100);
  }

  function updateProgress() {
    const sections = ['personal', 'emergency', 'insurance', 'medical', 'visit'];
    let totalFilled = 0;
    let totalCount = 0;

    sections.forEach(sectionKey => {
      const sectionEl = document.querySelector(`[data-section="${sectionKey}"]`)?.closest('section');
      if (!sectionEl) return;

      const fields = sectionEl.querySelectorAll('input, select, textarea');
      let filled = 0;
      let count = 0;

      fields.forEach(field => {
        // Skip checkboxes for simple counting, focus on text inputs
        if (field.type === 'checkbox') return;
        
        count++;
        totalCount++;
        
        const isFilled = field.value.trim().length > 0;
        if (isFilled) {
          filled++;
          totalFilled++;
        }
      });

      // Update section progress indicator
      const progressEl = document.getElementById(`${sectionKey}Progress`);
      if (progressEl) {
        progressEl.textContent = `${filled}/${count}`;
        if (filled === count) {
          progressEl.className = 'text-verify-teal text-xs ml-auto font-medium';
        } else {
          progressEl.className = 'text-verify-muted text-xs ml-auto';
        }
      }
    });

    // Update main progress bars
    const percentage = Math.round((totalFilled / totalCount) * 100) || 0;
    
    document.getElementById('progressBar').style.width = `${percentage}%`;
    document.getElementById('bottomProgress').style.width = `${percentage}%`;
    document.getElementById('completionText').textContent = `${percentage}% complete`;

    // Visual feedback on completion milestones
    if (percentage === 100 && !state.completedShown) {
      state.completedShown = true;
      showToast('All fields completed! Ready to submit.');
    }
  }

  // AI Processing
  window.processAIInput = async function() {
    const input = document.getElementById('aiInput');
    const btn = document.getElementById('aiTryBtn');
    const suggestions = document.getElementById('aiSuggestions');
    
    const text = input.value.trim();
    if (!text) return;

    // Show processing state
    state.aiProcessing = true;
    btn.disabled = true;
    btn.innerHTML = `<i data-lucide="loader-2" class="w-4 h-4 animate-spin"></i><span>Processing...</span>`;
    lucide.createIcons();

    // Simulate AI processing (in production, this would call an API)
    await new Promise(r => setTimeout(r, 1500));

    // Parse and extract information
    const extracted = extractInfoFromText(text);
    
    // Display suggestions
    displayAISuggestions(extracted, suggestions);
    
    // Reset button
    btn.disabled = false;
    btn.innerHTML = `<i data-lucide="wand-2" class="w-4 h-4"></i><span class="hidden sm:inline">Try it</span>`;
    lucide.createIcons();
    state.aiProcessing = false;
  };

  function extractInfoFromText(text) {
    const info = {};
    const lower = text.toLowerCase();

    // Name extraction
    const nameMatch = text.match(/(?:name is|i am|my name is)\s+([A-Z][a-z]+(?:\s+[A-Z][a-z]+)+)/i) ||
                     text.match(/^([A-Z][a-z]+(?:\s+[A-Z][a-z]+)+)/);
    if (nameMatch) info.fullName = nameMatch[1];

    // Date extraction (various formats)
    const dateMatch = text.match(/(?:born|birth|dob|birthday)[\s,]*([A-Za-z]+\s+\d{1,2}[,.]?\s*\d{4}|\d{1,2}[\/\-.]\d{1,2}[\/\-.]\d{2,4})/i);
    if (dateMatch) {
      info.dateOfBirth = parseDate(dateMatch[1]);
    }

    // Phone extraction
    const phoneMatch = text.match(/(\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4})/);
    if (phoneMatch) info.phone = phoneMatch[1];

    // Email extraction
    const emailMatch = text.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/);
    if (emailMatch) info.email = emailMatch[1];

    // Allergies
    if (lower.includes('allergic to') || lower.includes('allergy')) {
      const allergyMatch = text.match(/allergic to\s+([^,.]+)/i);
      if (allergyMatch) info.allergies = allergyMatch[1];
    }

    // Medications
    if (lower.includes('take') || lower.includes('medication')) {
      const medMatch = text.match(/(?:take|taking|on)\s+([^,.]+(?:mg|daily|twice|once)[^,.]*)/i);
      if (medMatch) info.medications = medMatch[1];
    }

    // Insurance
    const insuranceKeywords = {
      'aetna': 'aetna',
      'anthem': 'anthem',
      'blue cross': 'bcbs',
      'bluecross': 'bcbs',
      'cigna': 'cigna',
      'kaiser': 'kaiser',
      'medicare': 'medicare',
      'medicaid': 'medicaid',
      'united': 'united'
    };

    for (const [keyword, value] of Object.entries(insuranceKeywords)) {
      if (lower.includes(keyword)) {
        info.insuranceProvider = value;
        break;
      }
    }

    // Conditions
    const conditions = [];
    if (lower.includes('diabetes')) conditions.push('diabetes');
    if (lower.includes('hypertension') || lower.includes('high blood pressure')) conditions.push('hypertension');
    if (lower.includes('asthma')) conditions.push('asthma');
    if (lower.includes('heart')) conditions.push('heart-disease');
    if (conditions.length) info.conditions = conditions;

    return info;
  }

  function parseDate(dateStr) {
    // Try to parse various date formats and return YYYY-MM-DD
    const tryParse = new Date(dateStr);
    if (!isNaN(tryParse)) {
      return tryParse.toISOString().split('T')[0];
    }
    return null;
  }

  function displayAISuggestions(extracted, container) {
    container.innerHTML = '';
    container.classList.remove('hidden');

    const suggestions = Object.entries(extracted).filter(([key, value]) => value);

    if (suggestions.length === 0) {
      container.innerHTML = `
        <div class="ai-suggestion p-3 bg-amber-50 border border-amber-200 rounded-xl flex items-center gap-2">
          <i data-lucide="alert-circle" class="w-4 h-4 text-amber-600"></i>
          <span class="text-amber-800 text-sm">We couldn't extract specific information. Try being more specific with names, dates, and numbers.</span>
        </div>
      `;
      lucide.createIcons();
      return;
    }

    suggestions.forEach(([field, value]) => {
      const div = document.createElement('div');
      div.className = 'ai-suggestion p-3 bg-white border border-verify-teal/30 rounded-xl flex items-center justify-between gap-3';
      
      const displayField = field.replace(/([A-Z])/g, ' $1').replace(/^./, str => str.toUpperCase());
      const displayValue = Array.isArray(value) ? value.join(', ') : value;
      
      div.innerHTML = `
        <div class="flex items-center gap-2 flex-1">
          <i data-lucide="check-circle-2" class="w-4 h-4 text-verify-teal flex-shrink-0"></i>
          <div class="min-w-0">
            <span class="text-verify-muted text-xs">${displayField}</span>
            <p class="text-verify-text text-sm font-medium truncate">${displayValue}</p>
          </div>
        </div>
        <button onclick="applyAIValue('${field}', '${Array.isArray(value) ? value.join(',') : value}')" 
                class="px-3 py-1.5 bg-verify-teal text-white text-xs font-medium rounded-lg hover:bg-verify-teal-hover transition-colors flex-shrink-0">
          Apply
        </button>
      `;
      container.appendChild(div);
    });

    lucide.createIcons();
  }

  window.applyAIValue = function(field, value) {
    const input = document.querySelector(`[name="${field}"]`);
    if (!input) return;

    if (field === 'conditions') {
      const conditions = value.split(',');
      conditions.forEach(c => {
        const checkbox = document.querySelector(`[name="conditions"][value="${c}"]`);
        if (checkbox) checkbox.checked = true;
      });
    } else {
      input.value = value;
    }

    updateFieldStatus(input);
    updateProgress();

    // Remove applied suggestion
    const suggestions = document.getElementById('aiSuggestions');
    const applied = suggestions.querySelector(`button[onclick*="${field}"]`)?.closest('.ai-suggestion');
    if (applied) {
      applied.style.opacity = '0.5';
      applied.querySelector('button').textContent = 'Applied';
      applied.querySelector('button').disabled = true;
    }

    showToast(`${field.replace(/([A-Z])/g, ' $1')} applied`);
  };

  // Allergy tag toggle
  window.toggleAllergy = function(btn, allergy) {
    const input = document.getElementById('allergiesInput');
    const current = input.value.split(',').map(s => s.trim()).filter(s => s);
    
    if (btn.classList.contains('bg-verify-teal')) {
      // Remove
      btn.classList.remove('bg-verify-teal', 'text-white');
      btn.classList.add('bg-gray-100', 'text-verify-muted');
      const idx = current.indexOf(allergy);
      if (idx > -1) current.splice(idx, 1);
    } else {
      // Add
      btn.classList.remove('bg-gray-100', 'text-verify-muted');
      btn.classList.add('bg-verify-teal', 'text-white');
      if (!current.includes(allergy)) current.push(allergy);
    }
    
    input.value = current.join(', ');
    updateFieldStatus(input);
  };

  // Form submission
  window.submitForm = async function() {
    const form = document.getElementById('intakeForm');
    const required = form.querySelectorAll('[required]');
    let valid = true;

    required.forEach(field => {
      validateField(field);
      if (!field.value.trim()) valid = false;
    });

    if (!valid) {
      showToast('Please fill in all required fields');
      // Scroll to first error
      const firstError = form.querySelector('.error');
      if (firstError) {
        firstError.scrollIntoView({ behavior: 'smooth', block: 'center' });
        firstError.focus();
      }
      return;
    }

    // Simulate submission
    const submitBtn = document.querySelector('button[type="submit"]');
    const originalText = submitBtn.innerHTML;
    submitBtn.disabled = true;
    submitBtn.innerHTML = `<i data-lucide="loader-2" class="w-4 h-4 animate-spin"></i><span>Submitting...</span>`;
    lucide.createIcons();

    await new Promise(r => setTimeout(r, 2000));

    // Clear saved data
    localStorage.removeItem('verifyMC_intakeDraft');
    
    // Show success
    document.getElementById('successModal').classList.remove('hidden');
    document.getElementById('successModal').classList.add('flex');
  };

  window.closeModal = function() {
    document.getElementById('successModal').classList.add('hidden');
    document.getElementById('successModal').classList.remove('flex');
    // Reset form
    document.getElementById('intakeForm').reset();
    updateProgress();
  };

  // Draft saving
  window.saveDraft = function() {
    const form = document.getElementById('intakeForm');
    const data = new FormData(form);
    const saved = {};
    
    for (const [key, value] of data.entries()) {
      if (saved[key]) {
        if (!Array.isArray(saved[key])) saved[key] = [saved[key]];
        saved[key].push(value);
      } else {
        saved[key] = value;
      }
    }

    localStorage.setItem('verifyMC_intakeDraft', JSON.stringify(saved));
    showToast('Draft saved — you can return anytime');
  };

  function loadSavedData() {
    const saved = localStorage.getItem('verifyMC_intakeDraft');
    if (!saved) return;

    try {
      const data = JSON.parse(saved);
      Object.entries(data).forEach(([key, value]) => {
        const field = document.querySelector(`[name="${key}"]`);
        if (!field) return;

        if (field.type === 'checkbox') {
          field.checked = true;
        } else if (Array.isArray(value)) {
          // Handle multi-select checkboxes
          value.forEach(v => {
            const cb = document.querySelector(`[name="${key}"][value="${v}"]`);
            if (cb) cb.checked = true;
          });
        } else {
          field.value = value;
        }
      });
    } catch (e) {
      console.error('Failed to load saved data:', e);
    }
  }

  let saveDebounceTimer;
  function debouncedSave() {
    clearTimeout(saveDebounceTimer);
    saveDebounceTimer = setTimeout(() => {
      const form = document.getElementById('intakeForm');
      const data = new FormData(form);
      const saved = {};
      for (const [key, value] of data.entries()) {
        saved[key] = value;
      }
      localStorage.setItem('verifyMC_intakeDraft', JSON.stringify(saved));
    }, 2000);
  }

  // Toast notifications
  function showToast(message) {
    const toast = document.getElementById('toast');
    document.getElementById('toastMessage').textContent = message;
    toast.classList.remove('hidden');
    toast.classList.add('flex');
    
    setTimeout(() => {
      toast.classList.add('hidden');
      toast.classList.remove('flex');
    }, 3000);
  }

  // AI hints for specific fields
  function showAIHint(input) {
    // Could show contextual AI suggestions based on field type
    // Currently minimal to avoid intrusion
  }

})();