// Stats Display Module for Index Page
class StatsDisplay {
    constructor() {
        this.init();
    }

    init() {
        this.setupEventListeners();
        this.loadStats();
    }

    setupEventListeners() {
        // Reset stats modal listeners
        document.getElementById('reset-stats-btn')?.addEventListener('click', () => {
            this.showResetStatsModal();
        });

        document.getElementById('resetStatsModalClose')?.addEventListener('click', () => {
            this.hideResetStatsModal();
        });

        document.getElementById('resetStatsModalCancel')?.addEventListener('click', () => {
            this.hideResetStatsModal();
        });

        document.getElementById('resetStatsBackdrop')?.addEventListener('click', () => {
            this.hideResetStatsModal();
        });

        document.getElementById('confirmResetStats')?.addEventListener('click', () => {
            this.resetStats();
        });

        // Keyboard support for modal
        document.addEventListener('keydown', (e) => {
            const modal = document.getElementById('resetStatsModal');
            if (modal && modal.style.display === 'block') {
                if (e.key === 'Escape') {
                    this.hideResetStatsModal();
                } else if (e.key === 'Enter') {
                    const focusedElement = document.activeElement;
                    if (focusedElement.id === 'confirmResetStats') {
                        this.resetStats();
                    } else {
                        this.hideResetStatsModal();
                    }
                }
            }
        });
    }

    loadStats() {
        // Load statistics from localStorage
        let stats = {
            total_answered: 0,
            correct_answers: 0,
            incorrect_answers: 0,
            accuracy: 0
        };

        // Try to load from localStorage
        try {
            const savedStats = localStorage.getItem('balotario_stats');
            if (savedStats) {
                const parsedStats = JSON.parse(savedStats);
                stats = {
                    total_answered: parsedStats.totalAnswered || 0,
                    correct_answers: parsedStats.correctAnswers || 0,
                    incorrect_answers: parsedStats.incorrectAnswers || 0,
                    accuracy: parsedStats.accuracy || 0
                };
            }
        } catch (error) {
            console.warn('Error loading stats from localStorage:', error);
        }

        // Update UI
        this.updateStatsDisplay(stats);
    }

    updateStatsDisplay(stats) {
        const totalAnsweredEl = document.getElementById('total-answered');
        const accuracyEl = document.getElementById('accuracy');
        const accuracyBarEl = document.getElementById('accuracy-bar');
        const resetBtnEl = document.getElementById('reset-stats-btn');

        if (totalAnsweredEl) totalAnsweredEl.textContent = stats.total_answered;
        if (accuracyEl) accuracyEl.textContent = stats.accuracy + '%';
        if (accuracyBarEl) accuracyBarEl.style.width = stats.accuracy + '%';

        // Show/hide reset button based on stats
        if (resetBtnEl) {
            if (stats.total_answered > 0) {
                resetBtnEl.style.display = 'inline-block';
            } else {
                resetBtnEl.style.display = 'none';
            }
        }
    }

    showResetStatsModal() {
        if (window.Utils) {
            Utils.playSound('click');
        }

        const modal = document.getElementById('resetStatsModal');
        if (modal) {
            modal.style.display = 'block';
            document.body.classList.add('modal-open');

            // Focus cancel button for accessibility
            setTimeout(() => {
                const cancelBtn = document.getElementById('resetStatsModalCancel');
                if (cancelBtn) cancelBtn.focus();
            }, 100);
        }
    }

    hideResetStatsModal() {
        const dialog = document.getElementById('resetStatsDialog');
        if (dialog) {
            dialog.classList.add('modal-closing');

            setTimeout(() => {
                const modal = document.getElementById('resetStatsModal');
                if (modal) {
                    modal.style.display = 'none';
                    document.body.classList.remove('modal-open');
                    dialog.classList.remove('modal-closing');
                }
            }, 200);
        }
    }

    resetStats() {
        // Show loading in button
        const confirmBtn = document.getElementById('confirmResetStats');
        if (!confirmBtn) return;

        const originalText = confirmBtn.innerHTML;
        confirmBtn.innerHTML = '<i class="fas fa-spinner fa-spin me-1"></i>Restableciendo...';
        confirmBtn.disabled = true;

        // Reset statistics directly in localStorage
        try {
            // Reset using statsManager if available
            if (window.statsManager) {
                window.statsManager.resetStats();
            } else {
                // Reset directly in localStorage
                const resetStats = {
                    totalAnswered: 0,
                    correctAnswers: 0,
                    incorrectAnswers: 0,
                    accuracy: 0,
                    studyTime: 0,
                    examsTaken: 0,
                    bestScore: 0,
                    streak: 0,
                    lastActivity: null
                };
                localStorage.setItem('balotario_stats', JSON.stringify(resetStats));
            }

            // Simulate a small pause for better UX
            setTimeout(() => {
                // Reload statistics
                this.loadStats();

                // Hide modal
                this.hideResetStatsModal();

                // Restore button
                confirmBtn.innerHTML = originalText;
                confirmBtn.disabled = false;

                // Show success notification
                if (window.Utils) {
                    Utils.showNotification('Estadísticas restablecidas correctamente', 'success', 4000);
                    Utils.playSound('complete');
                } else {
                    alert('Estadísticas restablecidas correctamente');
                }

                // Small animation on stats card
                const statsCard = document.querySelector('.stats-card');
                if (statsCard) {
                    statsCard.style.transform = 'scale(1.05)';
                    statsCard.style.transition = 'transform 0.3s ease';

                    setTimeout(() => {
                        statsCard.style.transform = 'scale(1)';
                    }, 300);
                }

            }, 800);

        } catch (error) {
            console.error('Error resetting stats:', error);

            // Restore button on error
            confirmBtn.innerHTML = originalText;
            confirmBtn.disabled = false;

            if (window.Utils) {
                Utils.showNotification('Error al restablecer estadísticas', 'danger');
            } else {
                alert('Error al restablecer estadísticas');
            }
        }
    }
}

// Auto-initialize when DOM is ready
document.addEventListener('DOMContentLoaded', function() {
    if (document.getElementById('stats-content')) {
        window.statsDisplay = new StatsDisplay();
    }
});

// Export for global use
window.StatsDisplay = StatsDisplay;