// TeeTracker - Main Application
// Version 4.0: Local file storage in data/ directory

// ============================================
// Configuration
// ============================================

const STORAGE_KEY_TEAS = 'teatracker_teas';
const STORAGE_KEY_ENTRIES = 'teatracker_entries';
const DATA_DIRECTORY = 'data/';

// ============================================
// Local File Storage
// ============================================

class LocalFileStorage {
    constructor() {
        this.basePath = DATA_DIRECTORY;
        this.connected = false;
        this.lastError = null;
    }

    async testConnection() {
        try {
            // Try to create a test file
            const testFile = this.basePath + 'test_connection.txt';
            const response = await fetch(testFile, {
                method: 'PUT',
                body: 'test'
            });
            
            if (response.ok) {
                // Clean up test file
                await fetch(testFile, { method: 'DELETE' });
                this.connected = true;
                this.lastError = null;
                return true;
            } else {
                this.connected = false;
                this.lastError = `HTTP Error: ${response.status}`;
                return false;
            }
        } catch (error) {
            this.connected = false;
            this.lastError = error.message;
            console.log('Local file storage not available:', error.message);
            return false;
        }
    }

    async loadFile(filename) {
        try {
            const url = this.basePath + filename;
            const response = await fetch(url, {
                method: 'GET'
            });

            if (response.ok) {
                const text = await response.text();
                return text.trim() === '' ? [] : (text ? JSON.parse(text) : null);
            } else if (response.status === 404) {
                return null;
            }
            return null;
        } catch (error) {
            console.log(`Error loading ${filename}:`, error.message);
            return null;
        }
    }

    async saveFile(filename, data) {
        try {
            const url = this.basePath + filename;
            const response = await fetch(url, {
                method: 'PUT',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(data, null, 2)
            });
            return response.ok;
        } catch (error) {
            console.log(`Error saving ${filename}:`, error.message);
            return false;
        }
    }

    async fileExists(filename) {
        try {
            const url = this.basePath + filename;
            const response = await fetch(url, {
                method: 'HEAD'
            });
            return response.ok;
        } catch (error) {
            return false;
        }
    }
}

// ============================================
// Main TeeTracker Application
// ============================================

class TeeTracker {
    constructor() {
        // Storage
        this.fileStorage = new LocalFileStorage();
        this.useFileStorage = false;
        this.syncInProgress = false;
        
        // Data
        this.teas = [];
        this.entries = [];
        this.currentTeaId = null;
        this.charts = {};
        this.currentBgImage = null;
        
        // Tea Timer
        this.timer = null;
        this.timerSeconds = 180;
        this.timerRunning = false;
        this.timerPaused = false;
        this.remainingSeconds = 180;
        
        // Initialize
        this.initStorage();
        this.setupEventListeners();
        this.setupTimerListeners();
        this.loadData().then(() => {
            this.renderAll();
            this.initCharts();
            this.updateSettingsStats();
        });
    }
    
    // ============================================
    // Storage Initialization
    // ============================================
    
    async initStorage() {
        // Test if file storage is available
        this.useFileStorage = await this.fileStorage.testConnection();
        this.updateSyncStatus();
    }
    
    async loadData() {
        if (this.syncInProgress) return;
        this.syncInProgress = true;
        
        try {
            if (this.useFileStorage) {
                // Try to load from file storage first
                const teas = await this.fileStorage.loadFile('teas.json');
                const entries = await this.fileStorage.loadFile('entries.json');
                
                // Always load from localStorage as backup
                const localTeas = localStorage.getItem(STORAGE_KEY_TEAS);
                const localEntries = localStorage.getItem(STORAGE_KEY_ENTRIES);
                
                // Load from file storage if available, otherwise use local data
                if (teas) {
                    this.teas = teas.map(tea => ({
                        ...tea,
                        organic: tea.organic !== undefined ? tea.organic : false,
                        rating: tea.rating !== undefined ? tea.rating : 3
                    }));
                } else if (localTeas) {
                    try {
                        this.teas = JSON.parse(localTeas).map(tea => ({
                            ...tea,
                            organic: tea.organic !== undefined ? tea.organic : false,
                            rating: tea.rating !== undefined ? tea.rating : 3
                        }));
                    } catch (error) {
                        console.error('Error loading local teas:', error);
                        this.teas = [];
                    }
                } else {
                    this.teas = [];
                }
                
                if (entries) {
                    this.entries = entries.map(entry => ({
                        ...entry,
                        teaspoons: entry.teaspoons !== undefined ? entry.teaspoons : 1
                    }));
                } else if (localEntries) {
                    try {
                        this.entries = JSON.parse(localEntries).map(entry => ({
                            ...entry,
                            teaspoons: entry.teaspoons !== undefined ? entry.teaspoons : 1
                        }));
                    } catch (error) {
                        console.error('Error loading local entries:', error);
                        this.entries = [];
                    }
                } else {
                    this.entries = [];
                }
            } else {
                // Load from localStorage only
                this.loadFromLocalStorage();
            }
        } catch (error) {
            console.error('Error loading data:', error);
            this.loadFromLocalStorage();
        } finally {
            this.syncInProgress = false;
        }
    }
    
    loadFromLocalStorage() {
        const teasData = localStorage.getItem(STORAGE_KEY_TEAS);
        const entriesData = localStorage.getItem(STORAGE_KEY_ENTRIES);
        
        if (teasData) {
            try {
                this.teas = JSON.parse(teasData).map(tea => ({
                    ...tea,
                    organic: tea.organic !== undefined ? tea.organic : false,
                    rating: tea.rating !== undefined ? tea.rating : 3
                }));
            } catch (error) {
                this.teas = [];
            }
        }
        
        if (entriesData) {
            try {
                this.entries = JSON.parse(entriesData).map(entry => ({
                    ...entry,
                    teaspoons: entry.teaspoons !== undefined ? entry.teaspoons : 1
                }));
            } catch (error) {
                this.entries = [];
            }
        }
    }
    
    async saveData() {
        if (this.syncInProgress) return;
        this.syncInProgress = true;
        
        try {
            if (this.useFileStorage) {
                // Save to file storage
                const teasSaved = await this.fileStorage.saveFile('teas.json', this.teas);
                const entriesSaved = await this.fileStorage.saveFile('entries.json', this.entries);
                
                // Also save locally as backup
                this.saveToLocalStorage();
                
                if (teasSaved && entriesSaved) {
                    this.showToast('Daten erfolgreich in data/-Verzeichnis gespeichert!', 'success');
                } else {
                    this.showToast('Lokale Speicherung erfolgreich, Dateispeicherung fehlgeschlagen', 'warning');
                }
            } else {
                // Save only locally
                this.saveToLocalStorage();
            }
        } catch (error) {
            console.error('Error saving data:', error);
            this.showToast('Fehler beim Speichern der Daten', 'error');
        } finally {
            this.syncInProgress = false;
        }
    }
    
    saveToLocalStorage() {
        localStorage.setItem(STORAGE_KEY_TEAS, JSON.stringify(this.teas));
        localStorage.setItem(STORAGE_KEY_ENTRIES, JSON.stringify(this.entries));
    }
    
    updateSyncStatus() {
        const statusBadge = document.getElementById('sync-status');
        if (!statusBadge) return;
        
        if (this.useFileStorage) {
            statusBadge.textContent = 'Dateispeicherung aktiv';
            statusBadge.className = 'status-badge connected';
        } else {
            statusBadge.textContent = 'Lokaler Modus (localStorage)';
            statusBadge.className = 'status-badge local';
        }
    }
    
    // ============================================
    // Generate unique ID
    // ============================================
    
    generateId() {
        return Date.now().toString(36) + Math.random().toString(36).substr(2);
    }
    
    // ============================================
    // Get data by ID
    // ============================================
    
    getTeaById(id) {
        return this.teas.find(tea => tea.id === id);
    }
    
    getTeaIndexById(id) {
        return this.teas.findIndex(tea => tea.id === id);
    }
    
    // ============================================
    // Tea Management
    // ============================================
    
    addTea(tea) {
        const newTea = {
            id: this.generateId(),
            name: tea.name,
            type: tea.type,
            brand: tea.brand || '',
            description: tea.description || '',
            color: tea.color || '#8B4513',
            organic: tea.organic || false,
            rating: tea.rating || 3,
            image: tea.image || '',
            createdAt: new Date().toISOString()
        };
        this.teas.push(newTea);
        this.saveData();
        return newTea;
    }
    
    updateTea(id, updates) {
        const index = this.getTeaIndexById(id);
        if (index !== -1) {
            this.teas[index] = { ...this.teas[index], ...updates };
            this.saveData();
            return this.teas[index];
        }
        return null;
    }
    
    deleteTea(id) {
        const index = this.getTeaIndexById(id);
        if (index !== -1) {
            this.entries = this.entries.filter(entry => entry.teaId !== id);
            this.teas.splice(index, 1);
            this.saveData();
            return true;
        }
        return false;
    }
    
    // ============================================
    // Entry Management
    // ============================================
    
    addEntry(entry) {
        const newEntry = {
            id: this.generateId(),
            teaId: entry.teaId,
            date: entry.date,
            time: entry.time || '',
            amount: parseInt(entry.amount) || 1,
            teaspoons: parseInt(entry.teaspoons) || 1,
            notes: entry.notes || '',
            createdAt: new Date().toISOString()
        };
        this.entries.push(newEntry);
        this.saveData();
        return newEntry;
    }
    
    deleteEntry(id) {
        const index = this.entries.findIndex(entry => entry.id === id);
        if (index !== -1) {
            this.entries.splice(index, 1);
            this.saveData();
            return true;
        }
        return false;
    }
    
    // ============================================
    // Statistics
    // ============================================
    
    getTotalCups() {
        return this.entries.reduce((sum, entry) => sum + entry.amount, 0);
    }
    
    getTodayCups() {
        const today = new Date().toISOString().split('T')[0];
        return this.entries
            .filter(entry => entry.date === today)
            .reduce((sum, entry) => sum + entry.amount, 0);
    }
    
    getWeekCups() {
        const now = new Date();
        const weekAgo = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
        return this.entries
            .filter(entry => new Date(entry.date) >= weekAgo)
            .reduce((sum, entry) => sum + entry.amount, 0);
    }
    
    getEntriesByPeriod(period) {
        const now = new Date();
        let startDate;
        
        switch (period) {
            case 'today':
                startDate = new Date(now.getFullYear(), now.getMonth(), now.getDate());
                break;
            case 'week':
                startDate = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
                break;
            case 'month':
                startDate = new Date(now.getFullYear(), now.getMonth() - 1, now.getDate());
                break;
            case 'year':
                startDate = new Date(now.getFullYear() - 1, now.getMonth(), now.getDate());
                break;
            case 'all':
            default:
                startDate = new Date(0);
                break;
        }
        
        return this.entries.filter(entry => new Date(entry.date) >= startDate);
    }
    
    getCupsByPeriod(period) {
        const entries = this.getEntriesByPeriod(period);
        return entries.reduce((sum, entry) => sum + entry.amount, 0);
    }
    
    getCupsByTeaType(period = 'all') {
        const entries = this.getEntriesByPeriod(period);
        const typeCounts = {};
        
        entries.forEach(entry => {
            const tea = this.getTeaById(entry.teaId);
            if (tea && tea.type) {
                typeCounts[tea.type] = (typeCounts[tea.type] || 0) + entry.amount;
            }
        });
        
        return typeCounts;
    }
    
    getCupsByTea(period = 'all') {
        const entries = this.getEntriesByPeriod(period);
        const teaCounts = {};
        
        entries.forEach(entry => {
            const tea = this.getTeaById(entry.teaId);
            if (tea) {
                teaCounts[tea.id] = {
                    name: tea.name,
                    type: tea.type,
                    count: (teaCounts[tea.id] ? teaCounts[tea.id].count : 0) + entry.amount
                };
            }
        });
        
        return teaCounts;
    }
    
    getDailyConsumption(period = 'week') {
        const entries = this.getEntriesByPeriod(period);
        const dailyCounts = {};
        
        entries.forEach(entry => {
            const date = entry.date;
            dailyCounts[date] = (dailyCounts[date] || 0) + entry.amount;
        });
        
        return dailyCounts;
    }
    
    getMostConsumedTea(period = 'all') {
        const teaCounts = this.getCupsByTea(period);
        let maxCount = 0;
        let mostConsumed = null;
        
        for (const teaId in teaCounts) {
            if (teaCounts[teaId].count > maxCount) {
                maxCount = teaCounts[teaId].count;
                mostConsumed = teaCounts[teaId];
            }
        }
        
        return mostConsumed;
    }
    
    countUniqueDays(entries) {
        const days = new Set();
        entries.forEach(entry => {
            days.add(entry.date);
        });
        return days.size;
    }
    
    // ============================================
    // Initialization
    // ============================================
    
    init() {
        // Ensure data directory exists by attempting to save
        this.saveData().catch(() => {});
    }
    
    setupEventListeners() {
        // Tab navigation
        document.querySelectorAll('.tab-button').forEach(button => {
            button.addEventListener('click', () => {
                this.switchTab(button.dataset.tab);
            });
        });
        
        // Add tea button
        const addTeaBtn = document.getElementById('add-tea-btn');
        if (addTeaBtn) {
            addTeaBtn.addEventListener('click', () => this.openTeaModal());
        }
        
        // Tea modal
        const teaModal = document.getElementById('tea-modal');
        if (teaModal) {
            teaModal.addEventListener('click', (e) => {
                if (e.target.id === 'tea-modal') this.closeTeaModal();
            });
        }
        
        // Tea form
        const teaForm = document.getElementById('tea-form');
        if (teaForm) {
            teaForm.addEventListener('submit', (e) => this.handleTeaFormSubmit(e));
        }
        
        // Cancel tea button
        const cancelTeaBtn = document.getElementById('cancel-tea-btn');
        if (cancelTeaBtn) {
            cancelTeaBtn.addEventListener('click', () => this.closeTeaModal());
        }
        
        // Track form
        const trackForm = document.getElementById('track-form');
        if (trackForm) {
            trackForm.addEventListener('submit', (e) => this.handleTrackFormSubmit(e));
        }
        
        // Export/Import/Clear data buttons
        const exportBtn = document.getElementById('export-data');
        if (exportBtn) {
            exportBtn.addEventListener('click', () => this.exportData());
        }
        
        const importBtn = document.getElementById('import-data');
        if (importBtn) {
            importBtn.addEventListener('click', () => this.openImportModal());
        }
        
        const clearBtn = document.getElementById('clear-data');
        if (clearBtn) {
            clearBtn.addEventListener('click', () => this.showClearDataConfirm());
        }
        
        // Import modal
        const importModal = document.getElementById('import-modal');
        if (importModal) {
            importModal.addEventListener('click', (e) => {
                if (e.target.id === 'import-modal') this.closeImportModal();
            });
        }
        
        const closeImportBtn = document.getElementById('close-import-modal');
        if (closeImportBtn) {
            closeImportBtn.addEventListener('click', () => this.closeImportModal());
        }
        
        const cancelImportBtn = document.getElementById('cancel-import-btn');
        if (cancelImportBtn) {
            cancelImportBtn.addEventListener('click', () => this.closeImportModal());
        }
        
        const importDataBtn = document.getElementById('import-data-btn');
        if (importDataBtn) {
            importDataBtn.addEventListener('click', () => this.handleImportData());
        }
        
        // Confirm modal
        const confirmModal = document.getElementById('confirm-modal');
        if (confirmModal) {
            confirmModal.addEventListener('click', (e) => {
                if (e.target.id === 'confirm-modal') this.closeConfirmModal();
            });
        }
        
        const cancelConfirmBtn = document.getElementById('confirm-no');
        if (cancelConfirmBtn) {
            cancelConfirmBtn.addEventListener('click', () => this.closeConfirmModal());
        }
        
        const confirmBtn = document.getElementById('confirm-yes');
        if (confirmBtn) {
            confirmBtn.addEventListener('click', () => this.confirmAction());
        }
        
        // Background settings
        this.setupBackgroundListeners();
    }
    
    setupTimerListeners() {
        // Timer controls
        const startTimerBtn = document.getElementById('start-timer');
        const pauseTimerBtn = document.getElementById('pause-timer');
        const resetTimerBtn = document.getElementById('reset-timer');
        const timerInput = document.getElementById('timer-input');
        
        if (startTimerBtn) {
            startTimerBtn.addEventListener('click', () => this.startTimer());
        }
        
        if (pauseTimerBtn) {
            pauseTimerBtn.addEventListener('click', () => this.pauseTimer());
        }
        
        if (resetTimerBtn) {
            resetTimerBtn.addEventListener('click', () => this.resetTimer());
        }
        
        if (timerInput) {
            timerInput.addEventListener('change', (e) => this.updateTimerFromInput(e));
            timerInput.addEventListener('input', (e) => this.validateTimerInput(e));
        }
    }
    
    setupBackgroundListeners() {
        // Background image upload
        const bgUpload = document.getElementById('bg-image-upload');
        if (bgUpload) {
            bgUpload.addEventListener('change', (e) => this.handleBackgroundUpload(e));
        }
        
        // Background enable toggle
        const bgEnabled = document.getElementById('bg-enabled');
        if (bgEnabled) {
            bgEnabled.addEventListener('change', () => this.toggleBackground());
        }
        
        // Save background button
        const saveBgBtn = document.getElementById('save-bg');
        if (saveBgBtn) {
            saveBgBtn.addEventListener('click', () => this.saveBackgroundSettings());
        }
        
        // Remove background button
        const removeBgBtn = document.getElementById('remove-bg');
        if (removeBgBtn) {
            removeBgBtn.addEventListener('click', () => this.removeBackground());
        }
        
        // Load saved background settings
        this.loadBackgroundSettings();
    }
    
    // ============================================
    // Background Functions
    // ============================================
    
    handleBackgroundUpload(e) {
        const file = e.target.files[0];
        if (!file) return;
        
        const preview = document.getElementById('bg-preview-img');
        const previewContainer = document.getElementById('bg-image-preview');
        const removeBtn = document.getElementById('remove-bg');
        
        if (file.type.startsWith('image/')) {
            const reader = new FileReader();
            reader.onload = (event) => {
                preview.src = event.target.result;
                previewContainer.style.display = 'block';
                removeBtn.style.display = 'inline-flex';
                this.currentBgImage = event.target.result;
            };
            reader.readAsDataURL(file);
        }
    }
    
    toggleBackground() {
        const enabled = document.getElementById('bg-enabled').checked;
        if (enabled && this.currentBgImage) {
            document.documentElement.style.setProperty('--bg-image', `url("${this.currentBgImage}")`);
        } else {
            document.documentElement.style.setProperty('--bg-image', 'none');
        }
    }
    
    saveBackgroundSettings() {
        const enabled = document.getElementById('bg-enabled').checked;
        const settings = {
            enabled: enabled,
            image: this.currentBgImage || ''
        };
        localStorage.setItem('teatracker_bg_settings', JSON.stringify(settings));
        this.showToast('Hintergrundeinstellungen gespeichert!', 'success');
    }
    
    removeBackground() {
        this.currentBgImage = null;
        document.getElementById('bg-image-upload').value = '';
        document.getElementById('bg-preview-img').src = '';
        document.getElementById('bg-image-preview').style.display = 'none';
        document.getElementById('remove-bg').style.display = 'none';
        document.documentElement.style.setProperty('--bg-image', 'none');
        document.getElementById('bg-enabled').checked = false;
    }
    
    loadBackgroundSettings() {
        const settings = localStorage.getItem('teatracker_bg_settings');
        if (settings) {
            try {
                const bgSettings = JSON.parse(settings);
                this.currentBgImage = bgSettings.image || null;
                
                if (bgSettings.enabled && this.currentBgImage) {
                    document.getElementById('bg-enabled').checked = true;
                    document.getElementById('bg-preview-img').src = this.currentBgImage;
                    document.getElementById('bg-image-preview').style.display = 'block';
                    document.getElementById('remove-bg').style.display = 'inline-flex';
                    this.toggleBackground();
                }
            } catch (error) {
                console.error('Error loading background settings:', error);
            }
        }
    }
    
    // ============================================
    // Timer Functions
    // ============================================
    
    startTimer() {
        if (this.timerRunning) return;
        
        if (this.timerPaused) {
            this.timerPaused = false;
        } else {
            const input = document.getElementById('timer-input');
            if (input) {
                this.timerSeconds = parseInt(input.value) || 180;
                this.remainingSeconds = this.timerSeconds;
            } else {
                this.remainingSeconds = this.timerSeconds;
            }
        }
        
        this.timerRunning = true;
        this.updateTimerDisplay();
        
        this.timer = setInterval(() => {
            this.remainingSeconds--;
            this.updateTimerDisplay();
            
            if (this.remainingSeconds <= 0) {
                this.stopTimer();
                this.showToast('⏰ Tee ist fertig!', 'success');
                const audio = new Audio('data:audio/wav;base64,UklGRnoGAABXQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YQoGAACBhYqFbF1fdJivrJBhNjVgodDbq2EcBj+a2teleQAA');
                audio.play().catch(() => {});
            }
        }, 1000);
    }
    
    pauseTimer() {
        if (!this.timerRunning) return;
        
        clearInterval(this.timer);
        this.timerRunning = false;
        this.timerPaused = true;
    }
    
    stopTimer() {
        clearInterval(this.timer);
        this.timerRunning = false;
        this.timerPaused = false;
    }
    
    resetTimer() {
        this.stopTimer();
        const input = document.getElementById('timer-input');
        if (input) {
            this.timerSeconds = parseInt(input.value) || 180;
        } else {
            this.timerSeconds = 180;
        }
        this.remainingSeconds = this.timerSeconds;
        this.updateTimerDisplay();
    }
    
    updateTimerDisplay() {
        const display = document.getElementById('timer-display');
        if (display) {
            const minutes = Math.floor(this.remainingSeconds / 60);
            const seconds = this.remainingSeconds % 60;
            display.textContent = `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
        }
    }
    
    updateTimerFromInput(e) {
        const value = parseInt(e.target.value);
        if (value >= 10 && value <= 1800) {
            this.timerSeconds = value;
            this.remainingSeconds = value;
            this.updateTimerDisplay();
        }
    }
    
    validateTimerInput(e) {
        const value = e.target.value;
        if (value && (parseInt(value) < 10 || parseInt(value) > 1800)) {
            e.target.value = this.timerSeconds;
        }
    }
    
    // ============================================
    // Data Export/Import
    // ============================================
    
    exportData() {
        const data = {
            teas: this.teas,
            entries: this.entries,
            exportedAt: new Date().toISOString()
        };
        
        const dataStr = JSON.stringify(data, null, 2);
        const dataBlob = new Blob([dataStr], { type: 'application/json' });
        const url = URL.createObjectURL(dataBlob);
        
        const link = document.createElement('a');
        link.href = url;
        link.download = `teatracker_export_${new Date().toISOString().split('T')[0]}.json`;
        document.body.appendChild(link);
        
        link.click();
        document.body.removeChild(link);
        URL.revokeObjectURL(url);
        
        this.showToast('Daten wurden exportiert!', 'success');
    }
    
    openImportModal() {
        const modal = document.getElementById('import-modal');
        if (modal) {
            document.getElementById('import-data-textarea').value = '';
            modal.classList.add('active');
        }
    }
    
    async handleImportData() {
        const textarea = document.getElementById('import-data-textarea');
        if (!textarea) return;
        
        try {
            const data = JSON.parse(textarea.value);
            
            if (data.teas && data.entries) {
                // Merge or replace data
                if (confirm('Sollen die importierten Daten die bestehenden ersetzen?')) {
                    this.teas = data.teas.map(tea => ({
                        ...tea,
                        organic: tea.organic !== undefined ? tea.organic : false
                    }));
                    this.entries = data.entries;
                } else {
                    // Merge data
                    this.teas = [...this.teas, ...data.teas.map(tea => ({
                        ...tea,
                        organic: tea.organic !== undefined ? tea.organic : false
                    }))];
                    this.entries = [...this.entries, ...data.entries];
                }
                
                await this.saveData();
                this.closeImportModal();
                this.showToast('Daten wurden erfolgreich importiert!', 'success');
                this.renderAll();
                this.updateSettingsStats();
            } else {
                this.showToast('Ungültiges Datenformat!', 'error');
            }
        } catch (error) {
            this.showToast('Fehler beim Importieren der Daten!', 'error');
        }
    }
    
    closeImportModal() {
        const modal = document.getElementById('import-modal');
        if (modal) {
            modal.classList.remove('active');
        }
    }
    
    showClearDataConfirm() {
        const message = 'Möchtest du wirklich ALLE Daten löschen? Dieser Vorgang kann nicht rückgängig gemacht werden!';
        document.getElementById('confirm-message').textContent = message;
        document.getElementById('confirm-modal').classList.add('active');
        
        // Set action type
        this.tempConfirmAction = 'clearData';
    }
    
    async confirmAction() {
        if (this.tempConfirmAction === 'clearData') {
            await this.confirmClearData();
        } else if (this.tempConfirmAction === 'deleteTea') {
            this.handleDeleteTea();
        }
        this.tempConfirmAction = null;
    }
    
    async confirmClearData() {
        this.teas = [];
        this.entries = [];
        
        // Clear localStorage
        localStorage.removeItem(STORAGE_KEY_TEAS);
        localStorage.removeItem(STORAGE_KEY_ENTRIES);
        
        // Clear file storage if available
        if (this.useFileStorage) {
            await this.fileStorage.saveFile('teas.json', []);
            await this.fileStorage.saveFile('entries.json', []);
        }
        
        this.closeConfirmModal();
        this.showToast('Alle Daten wurden gelöscht!', 'success');
        this.renderAll();
        this.updateSettingsStats();
    }
    
    // ============================================
    // Tab Navigation
    // ============================================
    
    switchTab(tabId) {
        document.querySelectorAll('.tab-button').forEach(button => {
            button.classList.toggle('active', button.dataset.tab === tabId);
        });
        
        document.querySelectorAll('.tab-pane').forEach(pane => {
            pane.classList.toggle('active', pane.id === tabId);
        });
        
        if (tabId === 'teas') {
            this.renderTeasList();
        } else if (tabId === 'track') {
            this.renderTrackForm();
        } else if (tabId === 'stats') {
            this.updateStats();
        } else if (tabId === 'dashboard') {
            this.updateDashboard();
        } else if (tabId === 'settings') {
            this.updateSettingsStats();
        }
    }
    
    renderAll() {
        this.updateDashboard();
        this.renderTeasList();
        this.renderTrackForm();
        this.updateStats();
        this.updateSettingsStats();
    }
    
    updateSettingsStats() {
        const totalCups = document.getElementById('settings-total-cups');
        const totalTeas = document.getElementById('settings-total-teas');
        const firstEntry = document.getElementById('settings-first-entry');
        const lastEntry = document.getElementById('settings-last-entry');
        
        if (totalCups) totalCups.textContent = this.getTotalCups();
        if (totalTeas) totalTeas.textContent = this.teas.length;
        
        if (firstEntry) {
            if (this.entries.length > 0) {
                const first = this.entries.reduce((a, b) => new Date(a.createdAt) < new Date(b.createdAt) ? a : b);
                firstEntry.textContent = new Date(first.createdAt).toLocaleDateString('de-DE');
            } else {
                firstEntry.textContent = '-';
            }
        }
        
        if (lastEntry) {
            if (this.entries.length > 0) {
                const last = this.entries.reduce((a, b) => new Date(a.createdAt) > new Date(b.createdAt) ? a : b);
                lastEntry.textContent = new Date(last.createdAt).toLocaleDateString('de-DE');
            } else {
                lastEntry.textContent = '-';
            }
        }
    }
    
    // ============================================
    // Dashboard
    // ============================================
    
    updateDashboard() {
        const totalCups = document.getElementById('total-cups');
        const todayCups = document.getElementById('today-cups');
        const weekCups = document.getElementById('week-cups');
        const totalTeas = document.getElementById('total-teas');
        const recentActivities = document.getElementById('recent-entries');
        
        if (totalCups) totalCups.textContent = this.getTotalCups();
        if (todayCups) todayCups.textContent = this.getTodayCups();
        if (weekCups) weekCups.textContent = this.getWeekCups();
        if (totalTeas) totalTeas.textContent = this.teas.length;
        
        this.renderRecentEntries();
    }
    
    renderRecentEntries() {
        const container = document.getElementById('recent-entries');
        if (!container) return;
        
        const recentEntries = [...this.entries]
            .sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt))
            .slice(0, 5);
        
        if (recentEntries.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <div class="empty-state-icon">📝</div>
                    <div class="empty-state-text">Keine Aktivitäten vorhanden</div>
                    <div class="empty-state-subtext">Fange an, deinen Tee-Konsum zu tracken!</div>
                </div>
            `;
            return;
        }
        
        container.innerHTML = recentEntries.map(entry => {
            const tea = this.getTeaById(entry.teaId);
            const date = new Date(entry.date);
            const formattedDate = date.toLocaleDateString('de-DE');
            const formattedTime = entry.time ? entry.time.substring(0, 5) : '';
            
            return `
                <div class="activity-item">
                    <div class="activity-info">
                        <div class="activity-tea">${tea ? tea.name : 'Unbekannter Tee'} ${tea && tea.organic ? '<span class="organic-badge" title="Bio-Tee">🌱</span>' : ''}</div>
                        <div class="activity-details">${formattedDate} ${formattedTime ? `um ${formattedTime}` : ''}</div>
                    </div>
                    <div class="activity-amount">${entry.amount} Tasse${entry.amount > 1 ? 'n' : ''}${entry.teaspoons ? ` (${entry.teaspoons} TL)` : ''}</div>
                </div>
            `;
        }).join('');
    }
    
    // ============================================
    // Tea List
    // ============================================
    
    renderTeasList() {
        const container = document.getElementById('teas-list');
        if (!container) return;
        
        if (this.teas.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <div class="empty-state-icon">🍃</div>
                    <div class="empty-state-text">Keine Tee-Sorten vorhanden</div>
                    <div class="empty-state-subtext">Füge deine erste Tee-Sorte hinzu!</div>
                    <button class="btn btn-primary" onclick="app.openTeaModal()">➕ Tee hinzufügen</button>
                </div>
            `;
            return;
        }
        
        this.filterTeas();
    }
    
    filterTeas() {
        const searchInput = document.getElementById('tea-search');
        const typeFilter = document.getElementById('tea-type-filter');
        
        if (!searchInput) return;
        
        const searchTerm = searchInput.value.toLowerCase();
        const selectedType = typeFilter ? typeFilter.value : 'all';
        
        const filteredTeas = this.teas.filter(tea => {
            const matchesSearch = !searchTerm || 
                tea.name.toLowerCase().includes(searchTerm) ||
                tea.brand.toLowerCase().includes(searchTerm) ||
                tea.description.toLowerCase().includes(searchTerm);
            
            const matchesType = selectedType === 'all' || tea.type === selectedType;
            
            return matchesSearch && matchesType;
        });
        
        this.renderFilteredTeas(filteredTeas);
    }
    
    renderFilteredTeas(teas) {
        const container = document.getElementById('teas-list');
        if (!container) return;
        
        if (teas.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <div class="empty-state-icon">🔍</div>
                    <div class="empty-state-text">Keine Tee-Sorten gefunden</div>
                    <div class="empty-state-subtext">Versuche andere Suchbegriffe oder Filter</div>
                </div>
            `;
            return;
        }
        
        container.innerHTML = teas.map(tea => `
            <div class="tea-card" style="--tea-color: ${tea.color}">
                <div class="tea-card-header">
                    <div class="tea-card-name">${tea.name} ${tea.organic ? '<span class="organic-badge" title="Bio-Tee">🌱</span>' : ''}</div>
                    <div class="tea-card-type">${tea.type}</div>
                </div>
                <div class="tea-card-body">
                    ${tea.brand ? `<div class="tea-card-brand">Marke: ${tea.brand}</div>` : ''}
                    ${tea.description ? `<div class="tea-card-description">${tea.description}</div>` : ''}
                    ${tea.rating ? this.renderStarRatingStatic(tea.rating) : ''}
                </div>
                <div class="tea-card-footer">
                    <button class="btn-icon" onclick="app.editTea('${tea.id}')" title="Bearbeiten">
                        <span class="icon">✏️</span>
                    </button>
                    <button class="btn-icon btn-danger" onclick="app.showDeleteTeaConfirm('${tea.id}')" title="Löschen">
                        <span class="icon">🗑️</span>
                    </button>
                </div>
            </div>
        `).join('');
    }
    
    // ============================================
    // Tea Modal
    // ============================================
    
    openTeaModal(teaId = null) {
        const modal = document.getElementById('tea-modal');
        const form = document.getElementById('tea-form');
        
        if (modal) {
            if (teaId) {
                const tea = this.getTeaById(teaId);
                if (tea) {
                    document.getElementById('tea-id').value = tea.id;
                    document.getElementById('tea-name').value = tea.name;
                    document.getElementById('tea-type').value = tea.type;
                    document.getElementById('tea-brand').value = tea.brand || '';
                    document.getElementById('tea-description').value = tea.description || '';
                    document.getElementById('tea-color').value = tea.color || '#8B4513';
                    document.getElementById('tea-organic').checked = tea.organic || false;
                    document.getElementById('tea-image-preview-img').src = tea.image || '';
                    document.getElementById('tea-image-preview').style.display = tea.image ? 'block' : 'none';
                    
                    this.renderStarRating(tea.rating || 3, 'tea-rating');
                    this.currentTeaId = tea.id;
                }
            } else {
                // New tea
                form.reset();
                document.getElementById('tea-color').value = '#8B4513';
                document.getElementById('tea-organic').checked = false;
                document.getElementById('tea-image-preview-img').src = '';
                document.getElementById('tea-image-preview').style.display = 'none';
                this.renderStarRating(3, 'tea-rating');
                this.currentTeaId = null;
            }
            
            modal.classList.add('active');
        }
    }
    
    closeTeaModal() {
        const modal = document.getElementById('tea-modal');
        if (modal) {
            modal.classList.remove('active');
        }
        this.currentTeaId = null;
    }
    
    handleTeaFormSubmit(e) {
        e.preventDefault();
        
        const id = document.getElementById('tea-id').value;
        const name = document.getElementById('tea-name').value.trim();
        const type = document.getElementById('tea-type').value;
        const brand = document.getElementById('tea-brand').value.trim();
        const description = document.getElementById('tea-description').value.trim();
        const color = document.getElementById('tea-color').value;
        const organic = document.getElementById('tea-organic').checked;
        const image = document.getElementById('tea-image-preview').src || '';
        
        // Get rating from star rating
        const rating = this.getStarRating('tea-rating');
        
        if (!name || !type) {
            this.showToast('Bitte fülle alle Pflichtfelder aus!', 'error');
            return;
        }
        
        const teaData = { name, type, brand, description, color, organic, rating, image };
        
        if (id) {
            // Update existing tea
            this.updateTea(id, teaData);
            this.showToast('Tee-Sorte erfolgreich aktualisiert!', 'success');
        } else {
            // Add new tea
            this.addTea(teaData);
            this.showToast('Tee-Sorte erfolgreich hinzugefügt!', 'success');
        }
        
        this.closeTeaModal();
        this.renderTeasList();
        this.renderTrackForm();
        this.updateSettingsStats();
    }
    
    renderStarRating(rating, containerId) {
        const container = document.getElementById(containerId);
        if (!container) return;
        
        container.innerHTML = '';
        for (let i = 1; i <= 5; i++) {
            const star = document.createElement('span');
            star.className = 'star';
            star.textContent = i <= rating ? '★' : '☆';
            star.dataset.value = i;
            star.addEventListener('click', () => this.handleStarRatingClick(star, containerId));
            container.appendChild(star);
        }
    }
    
    renderStarRatingStatic(rating) {
        let html = '<div class="tea-rating">';
        for (let i = 1; i <= 5; i++) {
            html += `<span class="star">${i <= rating ? '★' : '☆'}</span>`;
        }
        html += '</div>';
        return html;
    }
    
    getStarRating(containerId) {
        const container = document.getElementById(containerId);
        if (!container) return 3;
        
        const stars = container.querySelectorAll('.star');
        for (let i = 0; i < stars.length; i++) {
            if (stars[i].textContent === '★') {
                return i + 1;
            }
        }
        return 0;
    }
    
    handleStarRatingClick(star, containerId) {
        const value = parseInt(star.dataset.value);
        const container = document.getElementById(containerId);
        if (!container) return;
        
        const stars = container.querySelectorAll('.star');
        stars.forEach((s, index) => {
            s.textContent = index < value ? '★' : '☆';
        });
    }
    
    handleImageUpload(e) {
        const file = e.target.files[0];
        if (!file) return;
        
        const preview = document.getElementById('tea-image-preview-img');
        const previewContainer = document.getElementById('tea-image-preview');
        
        if (file.type.startsWith('image/')) {
            const reader = new FileReader();
            reader.onload = (event) => {
                preview.src = event.target.result;
                previewContainer.style.display = 'block';
            };
            reader.readAsDataURL(file);
        }
    }
    
    editTea(teaId) {
        this.openTeaModal(teaId);
    }
    
    showDeleteTeaConfirm(teaId) {
        const tea = this.getTeaById(teaId);
        const message = `Möchtest du wirklich die Tee-Sorte "${tea ? tea.name : 'Unbekannt'}" löschen? Alle damit verbundenen Einträge werden ebenfalls gelöscht!`;
        document.getElementById('confirm-message').textContent = message;
        document.getElementById('confirm-modal').classList.add('active');
        
        this.tempConfirmAction = 'deleteTea';
        this.currentTeaId = teaId;
    }
    
    handleDeleteTea() {
        if (this.currentTeaId) {
            const tea = this.getTeaById(this.currentTeaId);
            if (tea) {
                this.deleteTea(this.currentTeaId);
                this.showToast(`Tee-Sorte "${tea.name}" wurde gelöscht!`, 'success');
                this.renderTeasList();
                this.renderTrackForm();
                this.updateSettingsStats();
            }
        }
        this.currentTeaId = null;
    }
    
    confirmDelete() {
        this.handleDeleteTea();
    }
    
    closeConfirmModal() {
        const modal = document.getElementById('confirm-modal');
        if (modal) {
            modal.classList.remove('active');
        }
        this.tempConfirmAction = null;
        this.currentTeaId = null;
    }
    
    // ============================================
    // Track Form
    // ============================================
    
    renderTrackForm() {
        const teaSelect = document.getElementById('track-tea');
        const today = new Date().toISOString().split('T')[0];
        
        if (!teaSelect) return;
        
        document.getElementById('track-date').value = today;
        
        if (this.teas.length === 0) {
            teaSelect.innerHTML = '<option value="">-- Keine Tee-Sorten verfügbar --</option>';
        } else {
            teaSelect.innerHTML = '<option value="">-- Wähle eine Tee-Sorte --</option>' +
                this.teas.map(tea => 
                    `<option value="${tea.id}">${tea.name} (${tea.type})${tea.organic ? ' 🌱' : ''}</option>`
                ).join('');
        }
        
        this.renderTrackRecentEntries();
    }
    
    handleTrackFormSubmit(e) {
        e.preventDefault();
        
        const teaId = document.getElementById('track-tea').value;
        const date = document.getElementById('track-date').value;
        const time = document.getElementById('track-time').value;
        const amount = document.getElementById('track-amount').value;
        const teaspoons = document.getElementById('track-teaspoons').value;
        const notes = document.getElementById('track-notes').value.trim();
        
        if (!teaId || !date || !amount) {
            this.showToast('Bitte fülle alle Pflichtfelder aus!', 'error');
            return;
        }
        
        const entry = {
            teaId,
            date,
            time,
            amount,
            teaspoons,
            notes
        };
        
        this.addEntry(entry);
        this.showToast('Tee-Konsum erfolgreich getrackt!', 'success');
        
        this.resetTrackForm();
        
        this.updateDashboard();
        this.updateStats();
        this.renderTrackRecentEntries();
        this.updateSettingsStats();
    }
    
    resetTrackForm() {
        const form = document.getElementById('track-form');
        if (form) {
            form.reset();
            const today = new Date().toISOString().split('T')[0];
            document.getElementById('track-date').value = today;
            document.getElementById('track-amount').value = 1;
        }
    }
    
    renderTrackRecentEntries() {
        const container = document.getElementById('track-recent-entries');
        if (!container) return;
        
        const recentEntries = [...this.entries]
            .sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt))
            .slice(0, 10);
        
        if (recentEntries.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <div class="empty-state-icon">📝</div>
                    <div class="empty-state-text">Keine Einträge vorhanden</div>
                    <div class="empty-state-subtext">Fange an, deinen Tee-Konsum zu tracken!</div>
                </div>
            `;
            return;
        }
        
        container.innerHTML = recentEntries.map(entry => {
            const tea = this.getTeaById(entry.teaId);
            const date = new Date(entry.date);
            const formattedDate = date.toLocaleDateString('de-DE');
            const formattedTime = entry.time ? entry.time.substring(0, 5) : '';
            
            return `
                <div class="activity-item">
                    <div class="activity-info">
                        <div class="activity-tea">${tea ? tea.name : 'Unbekannter Tee'} ${tea && tea.organic ? '<span class="organic-badge" title="Bio-Tee">🌱</span>' : ''}</div>
                        <div class="activity-details">${formattedDate} ${formattedTime ? `um ${formattedTime}` : ''}</div>
                    </div>
                    <div class="activity-amount">${entry.amount} Tasse${entry.amount > 1 ? 'n' : ''}${entry.teaspoons ? ` (${entry.teaspoons} TL)` : ''}</div>
                </div>
            `;
        }).join('');
    }
    
    // ============================================
    // Charts
    // ============================================
    
    initCharts() {
        // Check if Chart.js is loaded
        if (typeof Chart === 'undefined') {
            console.log('Chart.js not loaded, skipping charts initialization');
            return;
        }
        
        this.createTeaTypeChart();
        this.createDailyChart();
    }
    
    createTeaTypeChart() {
        const ctx = document.getElementById('tea-type-chart');
        if (!ctx) return;
        
        const typeCounts = this.getCupsByTeaType('all');
        const labels = Object.keys(typeCounts);
        const data = Object.values(typeCounts);
        
        // Define colors for each tea type
        const typeColors = {
            'Schwarztee': '#8B4513',
            'Grüntee': '#228B22',
            'Weißtee': '#F5F5DC',
            'Oolong': '#DAA520',
            'Pu-Erh': '#654321',
            'Früchtetee': '#FF6347',
            'Kräutertee': '#9ACD32',
            'Sonstiges': '#808080'
        };
        
        const backgroundColors = labels.map(label => typeColors[label] || '#8B4513');
        
        if (this.charts.teaType) {
            this.charts.teaType.destroy();
        }
        
        this.charts.teaType = new Chart(ctx, {
            type: 'doughnut',
            data: {
                labels: labels,
                datasets: [{
                    data: data,
                    backgroundColor: backgroundColors,
                    borderWidth: 1
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: true,
                plugins: {
                    legend: {
                        position: 'bottom',
                        labels: {
                            font: { size: 12 },
                            padding: 10
                        }
                    },
                    tooltip: {
                        callbacks: {
                            label: function(context) {
                                const label = context.label || '';
                                const value = context.raw || 0;
                                return `${label}: ${value} Tasse${value !== 1 ? 'n' : ''}`;
                            }
                        }
                    }
                }
            }
        });
    }
    
    createDailyChart() {
        const ctx = document.getElementById('daily-chart');
        if (!ctx) return;
        
        const dailyCounts = this.getDailyConsumption('week');
        const labels = Object.keys(dailyCounts).sort();
        const data = labels.map(date => dailyCounts[date] || 0);
        
        // Format dates for display
        const formattedLabels = labels.map(date => {
            const d = new Date(date);
            return d.toLocaleDateString('de-DE', { weekday: 'short', day: 'numeric' });
        });
        
        if (this.charts.daily) {
            this.charts.daily.destroy();
        }
        
        this.charts.daily = new Chart(ctx, {
            type: 'bar',
            data: {
                labels: formattedLabels,
                datasets: [{
                    label: 'Tassen pro Tag',
                    data: data,
                    backgroundColor: 'rgba(139, 69, 19, 0.7)',
                    borderColor: 'rgba(139, 69, 19, 1)',
                    borderWidth: 1
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: true,
                scales: {
                    y: {
                        beginAtZero: true,
                        ticks: {
                            stepSize: 1
                        }
                    }
                },
                plugins: {
                    legend: {
                        display: false
                    },
                    tooltip: {
                        callbacks: {
                            label: function(context) {
                                const value = context.raw || 0;
                                return `${value} Tasse${value !== 1 ? 'n' : ''}`;
                            }
                        }
                    }
                }
            }
        });
    }
    
    // ============================================
    // Statistics
    // ============================================
    
    updateStats() {
        this.updateDetailedStats('all');
        
        // Update charts
        this.createTeaTypeChart();
        this.createDailyChart();
    }
    
    renderDetailedStats(period) {
        const totalCups = this.getCupsByPeriod(period);
        const avgPerDay = this.calculateAveragePerDay(period);
        const activeDays = this.calculateActiveDays(period);
        const uniqueTeas = this.calculateUniqueTeas(period);
        const mostConsumed = this.getMostConsumedTea(period);
        
        const statsContainer = document.getElementById('detailed-stats');
        if (!statsContainer) return;
        
        statsContainer.innerHTML = `
            <div class="stat-card">
                <div class="stat-value">${totalCups}</div>
                <div class="stat-label">Gesamt getrunken</div>
            </div>
            <div class="stat-card">
                <div class="stat-value">${avgPerDay.toFixed(1)}</div>
                <div class="stat-label">Durchschnitt pro Tag</div>
            </div>
            <div class="stat-card">
                <div class="stat-value">${activeDays}</div>
                <div class="stat-label">Aktive Tage</div>
            </div>
            <div class="stat-card">
                <div class="stat-value">${uniqueTeas}</div>
                <div class="stat-label">Verschiedene Tees</div>
            </div>
            <div class="stat-card">
                <div class="stat-value">${mostConsumed ? mostConsumed.name : '-'}</div>
                <div class="stat-label">Meist getrunkener Tee</div>
            </div>
        `;
    }
    
    calculateAveragePerDay(period) {
        const entries = this.getEntriesByPeriod(period);
        if (entries.length === 0) return 0;
        
        const totalCups = this.getCupsByPeriod(period);
        const days = this.countUniqueDays(entries);
        return days > 0 ? totalCups / days : 0;
    }
    
    calculateActiveDays(period) {
        const entries = this.getEntriesByPeriod(period);
        return this.countUniqueDays(entries);
    }
    
    calculateUniqueTeas(period) {
        const entries = this.getEntriesByPeriod(period);
        const teaIds = new Set();
        entries.forEach(entry => teaIds.add(entry.teaId));
        return teaIds.size;
    }
    
    // ============================================
    // Toast Notifications
    // ============================================
    
    showToast(message, type = 'info') {
        const toastContainer = document.getElementById('toast-container');
        if (!toastContainer) return;
        
        const toast = document.createElement('div');
        toast.className = `toast toast-${type}`;
        toast.textContent = message;
        toastContainer.appendChild(toast);
        
        setTimeout(() => {
            toast.classList.add('show');
        }, 100);
        
        setTimeout(() => {
            toast.classList.remove('show');
            setTimeout(() => toast.remove(), 300);
        }, 3000);
    }
}

// Initialize application
let app;
document.addEventListener('DOMContentLoaded', () => {
    app = new TeeTracker();
});