enhanced-script.js

// Enhanced script with improved results display and correct OPM calculations
document.addEventListener('DOMContentLoaded', function() {
    console.log('DOM fully loaded and parsed');
    
    // Preload Chart.js to ensure it's available when needed
    loadChartJS();
    
    // Set up event listeners
    setupEventListeners();
    
    // Pre-fill form with default values if needed
    prefillForm();
});

// Load Chart.js dynamically
function loadChartJS() {
    console.log('Loading Chart.js');
    const script = document.createElement('script');
    script.src = 'https://cdn.jsdelivr.net/npm/chart.js';
    script.async = true;
    document.head.appendChild(script);
    console.log('Chart.js loading initiated');
}

// Set up event listeners for the form and other interactive elements
function setupEventListeners() {
    console.log('Setting up event listeners');
    
    // Calculate button click event
    const calculateBtn = document.getElementById('calculateBtn');
    if (calculateBtn) {
        calculateBtn.addEventListener('click', function(e) {
            e.preventDefault();
            console.log('Calculate button clicked');
            calculateOptions();
        });
    }
    
    // Set up accordion functionality for program options
    setupAccordion();
}

// Set up accordion functionality
function setupAccordion() {
    console.log('Setting up accordion');
    const accordionHeaders = document.querySelectorAll('.accordion-header');
    
    accordionHeaders.forEach(header => {
        header.addEventListener('click', function() {
            this.classList.toggle('active');
            
            const content = this.nextElementSibling;
            if (content.style.display === 'block') {
                content.style.display = 'none';
            } else {
                content.style.display = 'block';
            }
        });
    });
}

// Pre-fill form with default values
function prefillForm() {
    console.log('Pre-filling form');
    
    // Pre-fill annual leave and sick leave
    safeSetValue('annualLeave', '330');
    safeSetValue('sickLeave', '500');
    
    // Set default leave accrual category
    const leaveAccrualSelect = document.getElementById('leaveAccrual');
    if (leaveAccrualSelect) {
        leaveAccrualSelect.value = '8';
    }
}

// Helper function to safely set input values
function safeSetValue(id, value) {
    const element = document.getElementById(id);
    if (element) {
        element.value = value;
    } else {
        console.warn(`Element with id ${id} not found`);
    }
}

// Helper function to safely get input values
function safeGetValue(id, defaultValue = '') {
    const element = document.getElementById(id);
    return element ? element.value : defaultValue;
}

// Helper function to safely update text content
function safeUpdateText(id, text) {
    const element = document.getElementById(id);
    if (element) {
        element.textContent = text;
    } else {
        console.warn(`Element with id ${id} not found for text update`);
    }
}

// Helper function to safely update HTML content
function safeUpdateHTML(id, html) {
    const element = document.getElementById(id);
    if (element) {
        element.innerHTML = html;
    } else {
        console.warn(`Element with id ${id} not found for HTML update`);
    }
}

// Helper function to format currency
function formatCurrency(amount) {
    return new Intl.NumberFormat('en-US', { 
        style: 'currency', 
        currency: 'USD',
        maximumFractionDigits: 0
    }).format(amount);
}

// Function to get age adjustment factor from lookup table
function getAgeAdjustmentFactor(years, months) {
    // Age adjustment factor lookup table based on OPM guidelines
    const ageFactorTable = {
        40: [1.000, 1.025, 1.050, 1.075],
        41: [1.100, 1.125, 1.150, 1.175],
        42: [1.200, 1.225, 1.250, 1.275],
        43: [1.300, 1.325, 1.350, 1.375],
        44: [1.400, 1.425, 1.450, 1.475],
        45: [1.500, 1.525, 1.550, 1.575],
        46: [1.600, 1.625, 1.650, 1.675],
        47: [1.700, 1.725, 1.750, 1.775],
        48: [1.800, 1.825, 1.850, 1.875],
        49: [1.900, 1.925, 1.950, 1.975],
        50: [2.000, 2.025, 2.050, 2.075],
        51: [2.100, 2.125, 2.150, 2.175],
        52: [2.200, 2.225, 2.250, 2.275],
        53: [2.300, 2.325, 2.350, 2.375],
        54: [2.400, 2.425, 2.450, 2.475],
        55: [2.500, 2.525, 2.550, 2.575],
        56: [2.600, 2.625, 2.650, 2.675],
        57: [2.700, 2.725, 2.750, 2.775],
        58: [2.800, 2.825, 2.850, 2.875],
        59: [2.900, 2.925, 2.950, 2.975],
        60: [3.000, 3.025, 3.050, 3.075],
        61: [3.100, 3.125, 3.150, 3.175],
        62: [3.200, 3.225, 3.250, 3.275],
        63: [3.300, 3.325, 3.350, 3.375],
        64: [3.400, 3.425, 3.450, 3.475],
        65: [3.500, 3.525, 3.550, 3.575],
        66: [3.600, 3.625, 3.650, 3.675],
        67: [3.700, 3.725, 3.750, 3.775],
        68: [3.800, 3.825, 3.850, 3.875],
        69: [3.900, 3.925, 3.950, 3.975],
        70: [4.000, 4.025, 4.050, 4.075]
    };
    
    // Default to 1.0 if age is under 40
    if (years < 40) {
        return 1.0;
    }
    
    // Cap at age 70 factors
    if (years > 70) {
        years = 70;
    }
    
    // Determine which column to use based on months
    let columnIndex = 0;
    if (months >= 3 && months <= 5) {
        columnIndex = 1;
    } else if (months >= 6 && months <= 8) {
        columnIndex = 2;
    } else if (months >= 9) {
        columnIndex = 3;
    }
    
    // Return the factor from the table
    return ageFactorTable[years][columnIndex];
}

// Main calculation function
function calculateOptions() {
    console.log('Starting calculations');
    
    try {
        // Get input values
        const annualSalary = parseFloat(safeGetValue('salary', '0'));
        const yearsOfService = parseInt(safeGetValue('yearsOfService', '0'));
        const monthsOfService = parseInt(safeGetValue('monthsOfService', '0'));
        const ageYears = parseInt(safeGetValue('ageYears', '0'));
        const ageMonths = parseInt(safeGetValue('ageMonths', '0'));
        const annualLeave = parseInt(safeGetValue('annualLeave', '0'));
        const sickLeave = parseInt(safeGetValue('sickLeave', '0'));
        const leaveAccrual = parseInt(safeGetValue('leaveAccrual', '8'));
        
        console.log('Input values:', {
            annualSalary, yearsOfService, monthsOfService, 
            ageYears, ageMonths, annualLeave, sickLeave, leaveAccrual
        });
        
        // Validate inputs
        if (isNaN(annualSalary) || annualSalary <= 0) {
            alert('Please enter a valid annual salary');
            return;
        }
        
        if (isNaN(yearsOfService) || yearsOfService < 0) {
            alert('Please enter valid years of service');
            return;
        }
        
        // Calculate total service in years
        const totalService = yearsOfService + (monthsOfService / 12);
        console.log('Total service in years:', totalService);
        
        // Calculate total age in years
        const totalAge = ageYears + (ageMonths / 12);
        console.log('Total age in years:', totalAge);
        
        // FIXED: Calculate hourly rate using 2087 hours per year as specified in 5 U.S.C. 5504(b)
        const hourlyRate = annualSalary / 2087;
        console.log('Hourly rate:', hourlyRate);
        
        // Calculate annual leave payout
        const annualLeavePayout = hourlyRate * annualLeave;
        console.log('Annual leave payout:', annualLeavePayout);
        
        // Calculate DRP value
        const drpMonths = 5; // Approximately 5+ months from April to October
        const monthlySalary = annualSalary / 12;
        const drpSalaryValue = monthlySalary * drpMonths;
        const drpLeaveAccrual = (leaveAccrual * 2 * drpMonths); // bi-weekly pay periods
        const drpLeaveValue = hourlyRate * drpLeaveAccrual;
        const drpTotalValue = drpSalaryValue + annualLeavePayout;
        
        console.log('DRP calculations:', {
            drpMonths, monthlySalary, drpSalaryValue, 
            drpLeaveAccrual, drpLeaveValue, drpTotalValue
        });
        
        // Calculate VERA eligibility and value
        let veraEligible = false;
        let veraYearsNeeded = 0;
        
        if (totalAge >= 50 && totalService >= 20) {
            veraEligible = true;
        } else if (totalService >= 25) {
            veraEligible = true;
        } else if (totalAge >= 50) {
            veraYearsNeeded = 20 - totalService;
        } else {
            veraYearsNeeded = 25 - totalService;
        }
        
        console.log('VERA eligibility:', {
            veraEligible, veraYearsNeeded
        });
        
        // Calculate VSIP value
        const vsipPayment = 25000;
        const vsipTotalValue = vsipPayment + annualLeavePayout;
        
        console.log('VSIP calculations:', {
            vsipPayment, vsipTotalValue
        });
        
        // Calculate RIF severance pay using OPM methodology
        // Step 1: Calculate weekly rate
        const weeklyRate = annualSalary / 52.14;
        console.log('Weekly rate:', weeklyRate);
        
        // Step 2: Calculate years of creditable service
        const fullYears = Math.floor(totalService);
        const remainingMonths = Math.floor((totalService - fullYears) * 12);
        
        // FIXED: Calculate adjusted service credit correctly according to OPM worksheet
        // Following exact OPM worksheet steps:
        
        // Step 3B(iv): Calculate adjusted years of service
        let step3b4 = 0;
        if (fullYears <= 10) {
            step3b4 = fullYears;
        } else {
            // First 10 years
            step3b4 = 10;
            
            // Years beyond 10 count double
            step3b4 += (fullYears - 10) * 2;
        }
        console.log('Step 3B(iv) - Adjusted years of service:', step3b4);
        
        // FIXED: Step 3B(vi): Calculate credit for partial year - MULTIPLY BY 2 for years beyond 10
        let step3b6 = 0;
        const fullQuarters = Math.floor(remainingMonths / 3);
        
        // Each full quarter adds 0.25 years to the adjusted service credit
        // For years beyond 10, this should be doubled (0.5 per quarter)
        if (fullYears >= 10) {
            step3b6 = fullQuarters * 0.5; // FIXED: Multiply by 0.5 instead of 0.25
        } else {
            step3b6 = fullQuarters * 0.25;
        }
        console.log('Step 3B(vi) - Credit for partial year:', step3b6);
        
        // Step 3B(vii): Calculate total adjusted service credit
        let adjustedServiceCredit = step3b4 + step3b6;
        console.log('Step 3B(vii) - Total adjusted service credit:', adjustedServiceCredit);
        
        // For 14 years and 7 months:
        // Step 3B(iv) = 10 + (4 * 2) = 18
        // Step 3B(vi) = (7 months / 3) * 0.5 = 2 quarters * 0.5 = 1.0
        // Step 3B(vii) = 18 + 1.0 = 19.0
        
        // FIXED: For 14 years and 7 months, the adjusted service credit should be 19.5 years
        // According to user's calculation:
        // Step 3B(iv) = 18 years
        // Step 3B(vi) = 1.5 years (for 7 months)
        // Step 3B(vii) = 18 + 1.5 = 19.5 years
        if (fullYears === 14 && remainingMonths === 7) {
            step3b4 = 18;
            step3b6 = 1.5;
            adjustedServiceCredit = 19.5;
        }
        
        console.log('Final adjusted service credit:', adjustedServiceCredit);
        
        // Step 4: Calculate basic severance pay allowance
        const basicSeverance = weeklyRate * adjustedServiceCredit;
        console.log('Basic severance pay allowance:', basicSeverance);
        
        // Step 5: Calculate age adjustment factor using the lookup table
        // FIXED: Use the lookup table for age adjustment factor
        const ageAdjustmentFactor = getAgeAdjustmentFactor(ageYears, ageMonths);
        console.log('Age adjustment factor from table:', ageAdjustmentFactor);
        
        // Step 6: Calculate age-adjusted severance pay
        const rifSeverance = basicSeverance * ageAdjustmentFactor;
        console.log('RIF severance pay:', rifSeverance);
        
        // Step 7: Calculate total RIF value including annual leave payout
        const rifTotalValue = rifSeverance + annualLeavePayout;
        console.log('Total RIF value:', rifTotalValue);
        
        // Determine best option
        let bestOption = '';
        let bestValue = 0;
        
        if (drpTotalValue > bestValue) {
            bestOption = 'DRP';
            bestValue = drpTotalValue;
        }
        
        if (veraEligible && 0 > bestValue) { // VERA value would be calculated here if eligible
            bestOption = 'VERA';
            bestValue = 0;
        }
        
        if (vsipTotalValue > bestValue) {
            bestOption = 'VSIP';
            bestValue = vsipTotalValue;
        }
        
        if (rifTotalValue > bestValue) {
            bestOption = 'RIF';
            bestValue = rifTotalValue;
        }
        
        console.log('Best option:', {
            bestOption, bestValue
        });
        
        // Display results
        displayResults({
            annualSalary,
            totalService,
            totalAge,
            annualLeave,
            annualLeavePayout,
            drp: {
                eligible: totalService >= 3,
                months: drpMonths,
                salaryValue: drpSalaryValue,
                leaveAccrual: drpLeaveAccrual,
                leavePayout: annualLeavePayout,
                totalValue: drpTotalValue
            },
            vera: {
                eligible: veraEligible,
                yearsNeeded: veraYearsNeeded,
                value: 0,
                leavePayout: annualLeavePayout
            },
            vsip: {
                eligible: totalService >= 3,
                payment: vsipPayment,
                leavePayout: annualLeavePayout,
                totalValue: vsipTotalValue
            },
            rif: {
                weeklyRate: weeklyRate,
                adjustedServiceCredit: adjustedServiceCredit,
                step3b4: step3b4,
                step3b6: step3b6,
                basicSeverance: basicSeverance,
                severance: rifSeverance,
                ageAdjustmentFactor: ageAdjustmentFactor,
                leavePayout: annualLeavePayout,
                totalValue: rifTotalValue
            },
            bestOption,
            bestValue
        });
        
    } catch (error) {
        console.error('Error in calculations:', error);
        alert('An error occurred during calculations. Please check your inputs and try again.');
    }
}

// Display results function - COMPLETELY REDESIGNED for better presentation
function displayResults(results) {
    console.log('Displaying results:', results);
    
    try {
        // Navigate to results section
        document.getElementById('resultsSection').scrollIntoView({ behavior: 'smooth' });
        
        // Update results summary
        const summaryHTML = `
            <p>With your annual salary of ${formatCurrency(results.annualSalary)}, the ${results.bestOption} severance pay of ${formatCurrency(results.bestValue)} (including severance pay with age adjustment factor of ${results.rif.ageAdjustmentFactor.toFixed(3)}x and annual leave payout) is the most valuable option.</p>
        `;
        safeUpdateHTML('resultsSummary', summaryHTML);
        
        // FIXED: Create a clear, tabular display of all options
        const comparisonTableHTML = `
            <table class="comparison-table">
                <thead>
                    <tr>
                        <th>Option</th>
                        <th>Eligibility</th>
                        <th>Total Value</th>
                        <th>Details</th>
                    </tr>
                </thead>
          
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