/**
 * UI Management Module
 * Handles DOM updates, table rendering, and metric display
 */
class UIManager {
    constructor(calculator) {
        this.calculator = calculator;
    }

    updateSummaryMetrics() {
        try {
            const enabledResults = Object.values(this.calculator.results);
            if (enabledResults.length === 0) {
                this.setElementText('net-position', 'CHF 0');
                this.setElementText('csp-revenue', 'CHF 0');
                this.setElementText('roi-percentage', '0%');
                this.setElementText('breakeven-time', 'N/A');
                return;
            }

            // Calculate averages across enabled scenarios with enhanced financial metrics
            const avgNetPosition = enabledResults.reduce((sum, r) => sum + (r.netPosition || 0), 0) / enabledResults.length;
            const avgCSPRevenue = enabledResults.reduce((sum, r) => sum + r.cspRevenue, 0) / enabledResults.length;
            const avgROI = enabledResults.reduce((sum, r) => sum + r.roi, 0) / enabledResults.length;
            const avgBreakeven = enabledResults.filter(r => r.breakEvenMonth).reduce((sum, r) => sum + r.breakEvenMonth, 0) / enabledResults.filter(r => r.breakEvenMonth).length;

            // Update metrics with financial focus
            this.setElementText('net-position', this.formatCurrency(avgNetPosition));
            this.setElementText('csp-revenue', this.formatCurrency(avgCSPRevenue));
            this.setElementText('roi-percentage', this.formatPercentage(avgROI));
            this.setElementText('breakeven-time', isNaN(avgBreakeven) ? 'N/A' : `${Math.round(avgBreakeven)} months`);

            // Update metric card styling based on performance
            const netPositionElement = document.getElementById('net-position');
            if (netPositionElement) {
                if (avgNetPosition > 0) {
                    netPositionElement.className = 'metric-value text-success';
                } else if (avgNetPosition < 0) {
                    netPositionElement.className = 'metric-value text-danger';
                } else {
                    netPositionElement.className = 'metric-value';
                }
            }

            const roiElement = document.getElementById('roi-percentage');
            if (roiElement) {
                if (avgROI > 15) {
                    roiElement.className = 'metric-value text-success';
                } else if (avgROI > 5) {
                    roiElement.className = 'metric-value text-warning';
                } else if (avgROI < 0) {
                    roiElement.className = 'metric-value text-danger';
                } else {
                    roiElement.className = 'metric-value';
                }
            }
        } catch (error) {
            console.error('Error updating summary metrics:', error);
        }
    }

    updateComparisonTable() {
        try {
            const tbody = document.getElementById('comparison-tbody');
            if (!tbody) {
                console.error('Comparison table body not found');
                return;
            }
            
            tbody.innerHTML = '';

            Object.values(this.calculator.results).forEach(result => {
                const modelLabel = result.investmentModel === 'loan' ? 
                    '<span class="badge bg-warning">Loan</span>' : 
                    '<span class="badge bg-success">Direct</span>';
                
                const performanceInfo = result.investmentModel === 'direct' ? 
                    `<small class="text-muted d-block">Performance: ${result.performanceMultiplier.toFixed(2)}x</small>` +
                    `<small class="text-muted d-block">Grace: ${result.effectiveGracePeriod} months</small>` : 
                    '<small class="text-muted">Fixed returns</small>';
                
                const row = tbody.insertRow();
                row.innerHTML = `
                    <td><strong>${result.scenario}</strong><br>${performanceInfo}</td>
                    <td>${modelLabel}</td>
                    <td>${result.finalInstances.toLocaleString()}</td>
                    <td>${this.formatCurrencyDetailed(result.totalRevenue)}</td>
                    <td>${this.formatCurrencyDetailed(result.cspRevenue)}</td>
                    <td>${this.formatCurrencyDetailed(result.servalaRevenue)}</td>
                    <td class="${result.roi >= 0 ? 'text-success' : 'text-danger'}">
                        ${this.formatPercentage(result.roi)}
                        ${result.avgPerformanceBonus > 0 ? `<br><small class="text-info">+${this.formatPercentage(result.avgPerformanceBonus * 100)} bonus</small>` : ''}
                    </td>
                    <td>${result.breakEvenMonth ? result.breakEvenMonth + ' months' : 'N/A'}</td>
                `;
            });
        } catch (error) {
            console.error('Error updating comparison table:', error);
        }
    }

    updateMonthlyBreakdown() {
        try {
            const tbody = document.getElementById('monthly-tbody');
            if (!tbody) {
                console.error('Monthly breakdown table body not found');
                return;
            }
            
            tbody.innerHTML = '';

            // Combine all monthly data and sort by month and scenario
            const allData = [];
            Object.keys(this.calculator.monthlyData).forEach(scenario => {
                this.calculator.monthlyData[scenario].forEach(monthData => {
                    allData.push(monthData);
                });
            });

            allData.sort((a, b) => a.month - b.month || a.scenario.localeCompare(b.scenario));

            allData.forEach(data => {
                const row = tbody.insertRow();
                
                // Enhanced monthly breakdown with financial focus
                const performanceIcon = data.performanceBonus > 0 ? ' <i class="bi bi-star-fill text-warning" title="Performance Bonus Active"></i>' : '';
                const graceIcon = data.month <= (data.effectiveGracePeriod || 6) ? ' <i class="bi bi-shield-fill-check text-success" title="Grace Period Active"></i>' : '';
                const netPositionClass = (data.netPosition || 0) >= 0 ? 'text-success' : 'text-danger';
                
                row.innerHTML = `
                    <td><strong>${data.month}</strong>${graceIcon}</td>
                    <td><span class="badge bg-secondary">${data.scenario}</span>${performanceIcon}</td>
                    <td>+${data.newInstances}</td>
                    <td class="text-muted">-${data.churnedInstances}</td>
                    <td>${data.totalInstances.toLocaleString()}</td>
                    <td>${this.formatCurrencyDetailed(data.monthlyRevenue)}</td>
                    <td class="fw-bold">${this.formatCurrencyDetailed(data.cspRevenue)}</td>
                    <td class="text-muted">${this.formatCurrencyDetailed(data.servalaRevenue)}</td>
                    <td class="${netPositionClass} fw-bold">${this.formatCurrencyDetailed(data.netPosition || (data.cumulativeCSPRevenue - 500000))}</td>
                `;
            });
        } catch (error) {
            console.error('Error updating monthly breakdown:', error);
        }
    }

    setElementText(elementId, text) {
        const element = document.getElementById(elementId);
        if (element) {
            element.textContent = text;
        }
    }

    formatCurrency(amount) {
        try {
            // Use compact notation for large numbers in metric cards
            if (amount >= 1000000) {
                return new Intl.NumberFormat('de-CH', {
                    style: 'currency',
                    currency: 'CHF',
                    notation: 'compact',
                    minimumFractionDigits: 0,
                    maximumFractionDigits: 1
                }).format(amount);
            } else {
                return new Intl.NumberFormat('de-CH', {
                    style: 'currency',
                    currency: 'CHF',
                    minimumFractionDigits: 0,
                    maximumFractionDigits: 0
                }).format(amount);
            }
        } catch (error) {
            console.error('Error formatting currency:', error);
            return `CHF ${amount.toFixed(0)}`;
        }
    }

    formatCurrencyDetailed(amount) {
        try {
            // Use full formatting for detailed views (tables, exports)
            return new Intl.NumberFormat('de-CH', {
                style: 'currency',
                currency: 'CHF',
                minimumFractionDigits: 0,
                maximumFractionDigits: 0
            }).format(amount);
        } catch (error) {
            console.error('Error formatting detailed currency:', error);
            return `CHF ${amount.toFixed(0)}`;
        }
    }

    formatPercentage(value) {
        try {
            return new Intl.NumberFormat('de-CH', {
                style: 'percent',
                minimumFractionDigits: 1,
                maximumFractionDigits: 1
            }).format(value / 100);
        } catch (error) {
            console.error('Error formatting percentage:', error);
            return `${value.toFixed(1)}%`;
        }
    }
}