// Manager Approval Form Custom Script Engine
// This script provides dynamic behavior for the manager approval form

console.log('Manager Approval Form Script Loaded');

// Auto-set approval date to today
const setApprovalDate = () => {
  const today = new Date();
  const formattedDate = today.toISOString().split('T')[0]; // YYYY-MM-DD format
  setField('approval_date', formattedDate);
};

// Calculate and display recommended approval amounts
const calculateRecommendedAmounts = () => {
  const totalClaimed = parseFloat(getField('total_cost_display')) || 0;
  const policyLimit = parseFloat(getField('policy_limit_display')) || 0;
  const overBudget = parseFloat(getField('over_budget_amount_display')) || 0;
  
  if (totalClaimed > 0 && policyLimit > 0) {
    const percentageOver = ((overBudget / policyLimit) * 100).toFixed(1);
    showInfo(`This claim is ${percentageOver}% over the policy limit. Policy limit: RM${policyLimit.toFixed(2)}, Claimed: RM${totalClaimed.toFixed(2)}`);
  }
};

// Validate manager decision and provide guidance
const handleDecisionChange = (decision) => {
  const totalClaimed = parseFloat(getField('total_cost_display')) || 0;
  const policyLimit = parseFloat(getField('policy_limit_display')) || 0;
  
  console.log('Manager decision changed to:', decision);
  
  switch(decision) {
    case 'approve_full':
      showField('custom_approved_amount');
      showInfo(`💰 Approving full amount: RM${totalClaimed.toFixed(2)}. You can enter a custom amount if needed.`);
      setField('custom_approved_amount', totalClaimed.toString());
      break;
      
    case 'approve_policy':
      hideField('custom_approved_amount');
      showInfo(`⚖️ Approving policy limit only: RM${policyLimit.toFixed(2)}. Employee will be notified of the reduced amount.`);
      break;
      
    case 'reject':
      hideField('custom_approved_amount');
      showError('❌ Claim will be rejected. Please provide detailed comments explaining the rejection reason.');
      break;
      
    default:
      hideField('custom_approved_amount');
  }
};

// Validate custom approved amount
const validateCustomAmount = (amount) => {
  const numAmount = parseFloat(amount) || 0;
  const totalClaimed = parseFloat(getField('total_cost_display')) || 0;
  const policyLimit = parseFloat(getField('policy_limit_display')) || 0;
  
  if (numAmount < 0) {
    showError('Approved amount cannot be negative');
    return false;
  }
  
  if (numAmount > totalClaimed) {
    showError(`Approved amount (RM${numAmount}) cannot exceed claimed amount (RM${totalClaimed})`);
    return false;
  }
  
  if (numAmount > 0 && numAmount < policyLimit) {
    showInfo(`Custom amount (RM${numAmount}) is less than policy limit (RM${policyLimit}). Consider approving policy limit instead.`);
  }
  
  return true;
};

// Validate manager comments based on decision
const validateComments = (comments, decision) => {
  if (!comments || comments.trim().length < 10) {
    showError('Please provide detailed comments (minimum 10 characters)');
    return false;
  }
  
  if (decision === 'reject' && comments.length < 50) {
    showError('Rejection requires detailed explanation (minimum 50 characters)');
    return false;
  }
  
  if (decision === 'approve_full') {
    const totalClaimed = parseFloat(getField('total_cost_display')) || 0;
    const policyLimit = parseFloat(getField('policy_limit_display')) || 0;
    const overBudget = totalClaimed - policyLimit;
    
    if (overBudget > 500 && !comments.toLowerCase().includes('business')) {
      showInfo('Consider mentioning business justification for approving over-budget amounts > RM500');
    }
  }
  
  return true;
};

// Format manager name (title case)
const formatManagerName = (name) => {
  if (!name || typeof name !== 'string') return name;
  
  return name
    .toLowerCase()
    .split(' ')
    .map(word => word.charAt(0).toUpperCase() + word.slice(1))
    .join(' ');
};

// Form validation before submission
const validateApprovalForm = () => {
  let isValid = true;
  const errors = [];
  
  // Check required fields
  const requiredFields = {
    'manager_decision': 'Approval Decision',
    'manager_comments': 'Manager Comments',
    'manager_name': 'Manager Name',
    'approval_date': 'Approval Date'
  };
  
  Object.entries(requiredFields).forEach(([fieldName, displayName]) => {
    const value = getField(fieldName);
    if (!value || value.toString().trim() === '') {
      errors.push(`${displayName} is required`);
      isValid = false;
    }
  });
  
  // Validate decision-specific requirements
  const decision = getField('manager_decision');
  const comments = getField('manager_comments');
  const customAmount = getField('custom_approved_amount');
  
  if (decision && comments) {
    if (!validateComments(comments, decision)) {
      isValid = false;
    }
  }
  
  if (decision === 'approve_full' && customAmount) {
    if (!validateCustomAmount(customAmount)) {
      isValid = false;
    }
  }
  
  // Validate approval date is not in the future
  const approvalDate = getField('approval_date');
  if (approvalDate) {
    const selectedDate = new Date(approvalDate);
    const today = new Date();
    today.setHours(23, 59, 59, 999); // End of today
    
    if (selectedDate > today) {
      errors.push('Approval date cannot be in the future');
      isValid = false;
    }
  }
  
  // Show validation results
  if (errors.length > 0) {
    showError(`Please fix the following errors:\n• ${errors.join('\n• ')}`);
  } else {
    showSuccess('Form validation passed! Ready to submit approval decision.');
  }
  
  return isValid;
};

// Set up field change handlers
onFieldChange('manager_decision', (newValue) => {
  if (newValue) {
    handleDecisionChange(newValue);
  }
});

onFieldChange('custom_approved_amount', (newValue) => {
  if (newValue) {
    validateCustomAmount(newValue);
  }
});

onFieldChange('manager_comments', (newValue) => {
  const decision = getField('manager_decision');
  if (newValue && decision) {
    validateComments(newValue, decision);
  }
});

onFieldChange('manager_name', (newValue) => {
  if (newValue && typeof newValue === 'string') {
    const formatted = formatManagerName(newValue);
    if (formatted !== newValue) {
      setTimeout(() => {
        setField('manager_name', formatted);
      }, 100);
    }
  }
});

// Initialize form on load
setTimeout(() => {
  setApprovalDate();
  calculateRecommendedAmounts();
  
  // Make display fields read-only by adding visual styling
  const displayFields = [
    'claim_summary', 'employee_name_display', 'department_display',
    'trip_purpose_display', 'destination_display', 'total_cost_display',
    'policy_limit_display', 'over_budget_amount_display'
  ];
  
  displayFields.forEach(fieldName => {
    const fieldElement = document.querySelector(`[data-name="${fieldName}"] input`);
    if (fieldElement) {
      fieldElement.style.backgroundColor = '#f3f4f6';
      fieldElement.style.cursor = 'not-allowed';
      fieldElement.readOnly = true;
    }
  });
  
  showInfo('Review the claim details above and make your approval decision below.');
}, 1000);

// Expose validation function for form submission
window.validateManagerApprovalForm = validateApprovalForm;

console.log('Manager Approval Form Script initialized successfully');