// Global state management and utility functions
class ClaudeAppState {
    constructor() {
        this.loadFromStorage();
    }

    loadFromStorage() {
        try {
            const history = localStorage.getItem('claudeChat_history');
            const model = localStorage.getItem('claudeChat_selectedModel');
            const timestamp = localStorage.getItem('claudeChat_timestamp');
            
            // Validate timestamp (clear if older than 24 hours)
            if (timestamp && Date.now() - parseInt(timestamp) > 24 * 60 * 60 * 1000) {
                this.clearStorage();
                return;
            }

            if (history) {
                window.claudeApp.conversationHistory = JSON.parse(history);
            }
            if (model) {
                window.claudeApp.selectedModel = model;
            }
        } catch (error) {
            console.error('Error loading from storage:', error);
            this.clearStorage();
        }
    }

    saveToStorage() {
        try {
            localStorage.setItem('claudeChat_history', JSON.stringify(window.claudeApp.conversationHistory));
            localStorage.setItem('claudeChat_selectedModel', window.claudeApp.selectedModel);
            localStorage.setItem('claudeChat_timestamp', Date.now().toString());
        } catch (error) {
            console.error('Error saving to storage:', error);
        }
    }

    clearStorage() {
        localStorage.removeItem('claudeChat_history');
        localStorage.removeItem('claudeChat_selectedModel');
        localStorage.removeItem('claudeChat_timestamp');
        window.claudeApp.conversationHistory = [];
        window.claudeApp.selectedModel = 'claude-sonnet-4-5';
    }

    addMessage(role, content, timestamp = Date.now()) {
        const message = {
            role,
            content,
            timestamp,
            id: this.generateId()
        };
        
        window.claudeApp.conversationHistory.push(message);
        
        // Maintain 50 message limit
        if (window.claudeApp.conversationHistory.length > 50) {
            window.claudeApp.conversationHistory.shift();
        }
        
        this.saveToStorage();
        return message;
    }

    generateId() {
        return Date.now().toString(36) + Math.random().toString(36).substr(2);
    }

    setModel(model) {
        const oldModel = window.claudeApp.selectedModel;
        window.claudeApp.selectedModel = model;
        
        // Add system message if switching models mid-conversation
        if (window.claudeApp.conversationHistory.length > 0 && oldModel !== model) {
            this.addMessage('system', `Model changed to ${this.getModelLabel(model)} — previous context retained`);
        }
        
        this.saveToStorage();
    }

    getModelLabel(model) {
        const modelLabels = {
            'claude-sonnet-4-5': 'Claude Sonnet 4.5',
            'claude-sonnet-4': 'Claude Sonnet 4',
            'claude-opus-4-1': 'Claude Opus 4.1',
            'claude-opus-4': 'Claude Opus 4',
            'claude-haiku-4-5': 'Claude Haiku 4.5'
        };
        
        return modelLabels[model] || model;
    }
}

// Initialize app state
const appState = new ClaudeAppState();

// API Communication
class ClaudeAPI {
    async sendMessage(message, stream = false) {
        if (window.claudeApp.isProcessing) {
            throw new Error('Another request is already in progress');
        }

        window.claudeApp.isProcessing = true;
        window.claudeApp.isStreaming = stream;

        try {
            const options = {
                model: window.claudeApp.selectedModel,
                stream: stream
            };

            if (stream) {
                return this.sendStreamingMessage(message, options);
            } else {
                return this.sendStandardMessage(message, options);
            }
        } catch (error) {
            window.claudeApp.isProcessing = false;
            window.claudeApp.isStreaming = false;
            throw error;
        }
    }

    async sendStandardMessage(message, options) {
        try {
            const response = await puter.ai.chat(message, options);
            window.claudeApp.isProcessing = false;
            
            return response.message.content[0].text;
        } catch (error) {
            window.claudeApp.isProcessing = false;
            throw new Error(`API Error: ${error.message}`);
        }
    }

    async sendStreamingMessage(message, options) {
        try {
            const response = await puter.ai.chat(message, options);
            let fullResponse = '';
            
            for await (const part of response) {
                if (part.type === 'content_block_delta' && part.delta?.text) {
                    fullResponse += part.delta.text;
                    // Update the UI with the current response
                    this.updateStreamingResponse(fullResponse);
                }
            }
            
            window.claudeApp.isProcessing = false;
            window.claudeApp.isStreaming = false;
            return fullResponse;
        } catch (error) {
            window.claudeApp.isProcessing = false;
            window.claudeApp.isStreaming = false;
            throw new Error(`Streaming Error: ${error.message}`);
        }
    }

    updateStreamingResponse(content) {
        // This will be implemented in the chat-container component
        const chatContainer = document.querySelector('claude-chat-container');
        if (chatContainer && chatContainer.updateStreamingMessage) {
            chatContainer.updateStreamingMessage(content);
        }
    }
}

// Event handling and coordination
document.addEventListener('DOMContentLoaded', function() {
    const api = new ClaudeAPI();
    
    // Global event listeners for cross-component communication
    document.addEventListener('claude-send-message', async (event) => {
        const { message, stream } = event.detail;
        
        try {
            // Add user message to history
            appState.addMessage('user', message);
            
            // Show typing indicator
            document.dispatchEvent(new CustomEvent('claude-show-typing'));
            
            const response = await api.sendMessage(message, stream);
            
            // Hide typing indicator and add assistant response
            document.dispatchEvent(new CustomEvent('claude-hide-typing'));
            appState.addMessage('assistant', response);
            
            // Show success status
            document.dispatchEvent(new CustomEvent('claude-show-status', {
                detail: { type: 'success', message: 'Response received' }
            }));
        } catch (error) {
            document.dispatchEvent(new CustomEvent('claude-hide-typing'));
            document.dispatchEvent(new CustomEvent('claude-show-status', {
                detail: { type: 'error', message: error.message }
            }));
        }
    });

    document.addEventListener('claude-change-model', (event) => {
        const { model } = event.detail;
        appState.setModel(model);
    });

    document.addEventListener('claude-new-chat', () => {
        appState.clearStorage();
        document.dispatchEvent(new CustomEvent('claude-clear-chat'));
    });

    // Keyboard shortcuts
    document.addEventListener('keydown', (event) => {
        const isCmdK = (event.metaKey || event.ctrlKey) && event.key === 'k';
        const isCmdN = (event.metaKey || event.ctrlKey) && event.key === 'n';
        
        if (isCmdK) {
            event.preventDefault();
            document.dispatchEvent(new CustomEvent('claude-clear-input'));
        }
        
        if (isCmdN) {
            event.preventDefault();
            document.dispatchEvent(new CustomEvent('claude-new-chat'));
        }
    });
});