class EveAI {
    constructor(config) {
        // Required parameters
        this.tenantId = config.tenantId;
        this.serverUrl = config.serverUrl;
        this.specialistId = config.specialistId;
        this.proxyUrl = config.proxyUrl;

        // Optional parameters with defaults
        this.language = config.language || 'en';
        this.languages = config.languages?.split(',') || ['en'];
        this.domain = config.domain || window.location.origin;

        // Internal state
        this.sessionToken = null;
        this.initialized = false;
    }

    async getSessionToken() {
        try {
            const headers = {
                'Content-Type': 'application/json'
            };

            // Add WordPress-specific headers if they exist
            if (window.eveaiWP?.nonce) {
                headers['X-WP-Nonce'] = window.eveaiWP.nonce;
            }

            const response = await fetch(this.proxyUrl, {
                method: 'POST',
                headers: headers,
                body: JSON.stringify({
                    tenant_id: this.tenantId,
                    domain: this.domain
                })
            });

            if (!response.ok) {
                throw new Error('Failed to get session token');
            }

            const data = await response.json();
            return data.session_token;
        } catch (error) {
            console.error('Error getting session token:', error);
            throw error;
        }
    }

    async initializeChat(containerId) {
        try {
            // Get session token before initializing chat
            this.sessionToken = await this.getSessionToken();

            const container = document.getElementById(containerId);
            if (!container) {
                throw new Error('Container not found');
            }

            const chatWidget = document.createElement('eveai-chat-widget');
            Object.entries({
                'tenant-id': this.tenantId,
                'session-token': this.sessionToken,
                'domain': this.domain,
                'language': this.language,
                'languages': this.languages.join(','),
                'server-url': this.serverUrl,
                'specialist-id': this.specialistId
            }).forEach(([attr, value]) => {
                chatWidget.setAttribute(attr, value);
            });

            container.appendChild(chatWidget);
            this.initialized = true;

            return chatWidget;
        } catch (error) {
            console.error('Failed to initialize chat:', error);
            // Re-throw to allow custom error handling
            throw error;
        }
    }
}

// Make available globally
window.EveAI = EveAI;