/**
 * IndexedDB Service for Calendar App
 * Handles local storage of events and sync queue
 */
export class IndexedDBService {
    constructor() {
        this.db = null;
        this.initialized = false;
    }
    /**
     * Initialize and open the database
     */
    async initialize() {
        return new Promise((resolve, reject) => {
            const request = indexedDB.open(IndexedDBService.DB_NAME, IndexedDBService.DB_VERSION);
            request.onerror = () => {
                reject(new Error(`Failed to open IndexedDB: ${request.error}`));
            };
            request.onsuccess = () => {
                this.db = request.result;
                this.initialized = true;
                resolve();
            };
            request.onupgradeneeded = (event) => {
                const db = event.target.result;
                // Create events store
                if (!db.objectStoreNames.contains(IndexedDBService.EVENTS_STORE)) {
                    const eventsStore = db.createObjectStore(IndexedDBService.EVENTS_STORE, { keyPath: 'id' });
                    eventsStore.createIndex('start', 'start', { unique: false });
                    eventsStore.createIndex('end', 'end', { unique: false });
                    eventsStore.createIndex('syncStatus', 'syncStatus', { unique: false });
                }
                // Create operation queue store
                if (!db.objectStoreNames.contains(IndexedDBService.QUEUE_STORE)) {
                    const queueStore = db.createObjectStore(IndexedDBService.QUEUE_STORE, { keyPath: 'id' });
                    queueStore.createIndex('timestamp', 'timestamp', { unique: false });
                }
                // Create sync state store
                if (!db.objectStoreNames.contains(IndexedDBService.SYNC_STATE_STORE)) {
                    db.createObjectStore(IndexedDBService.SYNC_STATE_STORE, { keyPath: 'key' });
                }
            };
        });
    }
    /**
     * Check if database is initialized
     */
    isInitialized() {
        return this.initialized;
    }
    /**
     * Ensure database is initialized
     */
    ensureDB() {
        if (!this.db) {
            throw new Error('IndexedDB not initialized. Call initialize() first.');
        }
        return this.db;
    }
    // ========================================
    // Event CRUD Operations
    // ========================================
    /**
     * Get a single event by ID
     */
    async getEvent(id) {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.EVENTS_STORE], 'readonly');
            const store = transaction.objectStore(IndexedDBService.EVENTS_STORE);
            const request = store.get(id);
            request.onsuccess = () => {
                const event = request.result;
                resolve(event ? this.deserializeEvent(event) : null);
            };
            request.onerror = () => {
                reject(new Error(`Failed to get event ${id}: ${request.error}`));
            };
        });
    }
    /**
     * Get all events
     */
    async getAllEvents() {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.EVENTS_STORE], 'readonly');
            const store = transaction.objectStore(IndexedDBService.EVENTS_STORE);
            const request = store.getAll();
            request.onsuccess = () => {
                const events = request.result;
                resolve(events.map(e => this.deserializeEvent(e)));
            };
            request.onerror = () => {
                reject(new Error(`Failed to get all events: ${request.error}`));
            };
        });
    }
    /**
     * Save an event (create or update)
     */
    async saveEvent(event) {
        const db = this.ensureDB();
        const serialized = this.serializeEvent(event);
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.EVENTS_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.EVENTS_STORE);
            const request = store.put(serialized);
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to save event ${event.id}: ${request.error}`));
            };
        });
    }
    /**
     * Delete an event
     */
    async deleteEvent(id) {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.EVENTS_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.EVENTS_STORE);
            const request = store.delete(id);
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to delete event ${id}: ${request.error}`));
            };
        });
    }
    // ========================================
    // Queue Operations
    // ========================================
    /**
     * Add operation to queue
     */
    async addToQueue(operation) {
        const db = this.ensureDB();
        const queueItem = {
            ...operation,
            id: `${operation.type}-${operation.eventId}-${Date.now()}`
        };
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.QUEUE_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.QUEUE_STORE);
            const request = store.put(queueItem);
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to add to queue: ${request.error}`));
            };
        });
    }
    /**
     * Get all queue operations (sorted by timestamp)
     */
    async getQueue() {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.QUEUE_STORE], 'readonly');
            const store = transaction.objectStore(IndexedDBService.QUEUE_STORE);
            const index = store.index('timestamp');
            const request = index.getAll();
            request.onsuccess = () => {
                resolve(request.result);
            };
            request.onerror = () => {
                reject(new Error(`Failed to get queue: ${request.error}`));
            };
        });
    }
    /**
     * Remove operation from queue
     */
    async removeFromQueue(id) {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.QUEUE_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.QUEUE_STORE);
            const request = store.delete(id);
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to remove from queue: ${request.error}`));
            };
        });
    }
    /**
     * Clear entire queue
     */
    async clearQueue() {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.QUEUE_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.QUEUE_STORE);
            const request = store.clear();
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to clear queue: ${request.error}`));
            };
        });
    }
    // ========================================
    // Sync State Operations
    // ========================================
    /**
     * Save sync state value
     */
    async setSyncState(key, value) {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.SYNC_STATE_STORE], 'readwrite');
            const store = transaction.objectStore(IndexedDBService.SYNC_STATE_STORE);
            const request = store.put({ key, value });
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to set sync state ${key}: ${request.error}`));
            };
        });
    }
    /**
     * Get sync state value
     */
    async getSyncState(key) {
        const db = this.ensureDB();
        return new Promise((resolve, reject) => {
            const transaction = db.transaction([IndexedDBService.SYNC_STATE_STORE], 'readonly');
            const store = transaction.objectStore(IndexedDBService.SYNC_STATE_STORE);
            const request = store.get(key);
            request.onsuccess = () => {
                const result = request.result;
                resolve(result ? result.value : null);
            };
            request.onerror = () => {
                reject(new Error(`Failed to get sync state ${key}: ${request.error}`));
            };
        });
    }
    // ========================================
    // Serialization Helpers
    // ========================================
    /**
     * Serialize event for IndexedDB storage (convert Dates to ISO strings)
     */
    serializeEvent(event) {
        return {
            ...event,
            start: event.start instanceof Date ? event.start.toISOString() : event.start,
            end: event.end instanceof Date ? event.end.toISOString() : event.end
        };
    }
    /**
     * Deserialize event from IndexedDB (convert ISO strings to Dates)
     */
    deserializeEvent(event) {
        return {
            ...event,
            start: typeof event.start === 'string' ? new Date(event.start) : event.start,
            end: typeof event.end === 'string' ? new Date(event.end) : event.end
        };
    }
    /**
     * Close database connection
     */
    close() {
        if (this.db) {
            this.db.close();
            this.db = null;
        }
    }
    /**
     * Delete entire database (for testing/reset)
     */
    static async deleteDatabase() {
        return new Promise((resolve, reject) => {
            const request = indexedDB.deleteDatabase(IndexedDBService.DB_NAME);
            request.onsuccess = () => {
                resolve();
            };
            request.onerror = () => {
                reject(new Error(`Failed to delete database: ${request.error}`));
            };
        });
    }
    /**
     * Seed IndexedDB with mock data if empty
     */
    async seedIfEmpty(mockDataUrl = 'data/mock-events.json') {
        try {
            const existingEvents = await this.getAllEvents();
            if (existingEvents.length > 0) {
                console.log(`IndexedDB already has ${existingEvents.length} events - skipping seed`);
                return;
            }
            console.log('IndexedDB is empty - seeding with mock data');
            // Check if online to fetch mock data
            if (!navigator.onLine) {
                console.warn('Offline and IndexedDB empty - starting with no events');
                return;
            }
            // Fetch mock events
            const response = await fetch(mockDataUrl);
            if (!response.ok) {
                throw new Error(`Failed to fetch mock events: ${response.statusText}`);
            }
            const mockEvents = await response.json();
            // Convert and save to IndexedDB
            for (const event of mockEvents) {
                const calendarEvent = {
                    ...event,
                    start: new Date(event.start),
                    end: new Date(event.end),
                    allDay: event.allDay || false,
                    syncStatus: 'synced'
                };
                await this.saveEvent(calendarEvent);
            }
            console.log(`Seeded IndexedDB with ${mockEvents.length} mock events`);
        }
        catch (error) {
            console.error('Failed to seed IndexedDB:', error);
            // Don't throw - allow app to start with empty calendar
        }
    }
}
IndexedDBService.DB_NAME = 'CalendarDB';
IndexedDBService.DB_VERSION = 1;
IndexedDBService.EVENTS_STORE = 'events';
IndexedDBService.QUEUE_STORE = 'operationQueue';
IndexedDBService.SYNC_STATE_STORE = 'syncState';
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