/**
 * Alexa Skill Lambda - OpenClaw/Grok Integration
 * Connects Alexa to your personal AI gateway
 */

const https = require('https');
const http = require('http');

// Gateway configuration - set via environment variables or Account Linking
const DEFAULT_GATEWAY_URL = process.env.OPENCLAW_GATEWAY_URL || '';
const DEFAULT_GATEWAY_PASSWORD = process.env.OPENCLAW_GATEWAY_PASSWORD || '';

// Fallback to Grok API
const XAI_API_KEY = process.env.XAI_API_KEY || '';

// Call OpenClaw gateway using OpenAI-compatible endpoint
async function callGateway(message) {
    return new Promise((resolve, reject) => {
        const url = new URL(DEFAULT_GATEWAY_URL);

        // OpenClaw uses OpenAI-compatible chat completions endpoint
        const postData = JSON.stringify({
            model: 'openclaw',
            messages: [
                {
                    role: 'system',
                    content: 'You are Smart Claw, a helpful AI assistant connected via Alexa. Keep responses concise and suitable for voice output (under 150 words).'
                },
                {
                    role: 'user',
                    content: message
                }
            ],
            stream: false
        });

        const options = {
            hostname: url.hostname,
            port: 443,
            path: '/v1/chat/completions',
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Content-Length': Buffer.byteLength(postData),
                'Authorization': `Bearer ${DEFAULT_GATEWAY_PASSWORD}`
            },
            timeout: 25000
        };

        console.log('Calling OpenClaw gateway:', DEFAULT_GATEWAY_URL + '/v1/chat/completions');

        const req = https.request(options, (res) => {
            let data = '';
            res.on('data', chunk => data += chunk);
            res.on('end', () => {
                console.log('Gateway response status:', res.statusCode);
                console.log('Gateway response data:', data.substring(0, 500));

                // If gateway returns HTML or error, fall back to Grok
                if (res.statusCode !== 200 || data.includes('<!DOCTYPE') || data.includes('<html')) {
                    reject(new Error(`Gateway returned status ${res.statusCode}`));
                    return;
                }

                try {
                    const json = JSON.parse(data);
                    // OpenAI-compatible response format
                    if (json.choices && json.choices[0] && json.choices[0].message) {
                        resolve(json.choices[0].message.content);
                    } else if (json.error) {
                        reject(new Error(json.error.message || 'Gateway error'));
                    } else {
                        reject(new Error('Unexpected gateway response format'));
                    }
                } catch (e) {
                    reject(new Error('Could not parse gateway response: ' + e.message));
                }
            });
        });

        req.on('error', (e) => {
            console.error('Gateway request error:', e.message);
            reject(e);
        });

        req.on('timeout', () => {
            console.error('Gateway request timeout');
            req.destroy();
            reject(new Error('Gateway timeout'));
        });

        req.write(postData);
        req.end();
    });
}

// Call Grok API directly (fallback)
async function callGrok(message) {
    return new Promise((resolve, reject) => {
        const postData = JSON.stringify({
            model: 'grok-3-fast',
            messages: [
                {
                    role: 'system',
                    content: 'You are a helpful AI assistant called Smart Claw. Keep responses concise and suitable for voice output (under 150 words).'
                },
                {
                    role: 'user',
                    content: message
                }
            ],
            max_tokens: 400
        });

        const options = {
            hostname: 'api.x.ai',
            port: 443,
            path: '/v1/chat/completions',
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Content-Length': Buffer.byteLength(postData),
                'Authorization': `Bearer ${XAI_API_KEY}`
            }
        };

        const req = https.request(options, (res) => {
            let data = '';
            res.on('data', chunk => data += chunk);
            res.on('end', () => {
                try {
                    const json = JSON.parse(data);
                    if (json.choices && json.choices[0] && json.choices[0].message) {
                        resolve(json.choices[0].message.content);
                    } else {
                        resolve('Sorry, I could not process that request.');
                    }
                } catch (e) {
                    resolve('Sorry, I encountered an error.');
                }
            });
        });

        req.on('error', reject);
        req.write(postData);
        req.end();
    });
}

// Main handler
exports.handler = async (event) => {
    console.log('Alexa Request:', JSON.stringify(event, null, 2));

    const requestType = event.request.type;

    // Launch request
    if (requestType === 'LaunchRequest') {
        return buildResponse(
            'Welcome to Smart Claw, connected to your OpenClaw gateway. What would you like to know?',
            false
        );
    }

    // Intent request
    if (requestType === 'IntentRequest') {
        const intentName = event.request.intent.name;

        if (intentName === 'AMAZON.HelpIntent') {
            return buildResponse(
                'I am connected to your OpenClaw AI gateway. You can ask me anything. Try saying: scan my network, or tell me a joke.',
                false
            );
        }

        if (intentName === 'AMAZON.StopIntent' || intentName === 'AMAZON.CancelIntent') {
            return buildResponse('Goodbye!', true);
        }

        if (intentName === 'AMAZON.FallbackIntent') {
            return buildResponse('I did not catch that. Please try again.', false);
        }

        // Handle ChatIntent - main conversation
        if (intentName === 'ChatIntent') {
            const userMessage = event.request.intent.slots?.query?.value || 'Hello';
            console.log('User message:', userMessage);

            try {
                let response;

                // Try gateway first
                try {
                    console.log('Attempting gateway call...');
                    response = await callGateway(userMessage);
                    console.log('Gateway success:', response?.substring(0, 100));
                } catch (gatewayError) {
                    console.log('Gateway failed, using Grok:', gatewayError.message);
                    // Fallback to Grok
                    if (XAI_API_KEY) {
                        response = await callGrok(userMessage);
                    } else {
                        response = 'Sorry, I could not connect to the gateway. Please check if OpenClaw is running.';
                    }
                }

                // Clean and truncate response
                let speechResponse = String(response).trim();
                if (speechResponse.length > 6000) {
                    speechResponse = speechResponse.substring(0, 5900) + '... That is all for now.';
                }

                return buildResponse(speechResponse, false);
            } catch (error) {
                console.error('Handler error:', error);
                return buildResponse('Sorry, I encountered an error. Please try again.', false);
            }
        }
    }

    // Session ended
    if (requestType === 'SessionEndedRequest') {
        return { version: '1.0', response: {} };
    }

    return buildResponse('I did not understand that. Please try again.', false);
};

function buildResponse(speechText, shouldEndSession) {
    return {
        version: '1.0',
        response: {
            outputSpeech: {
                type: 'PlainText',
                text: speechText
            },
            shouldEndSession: shouldEndSession,
            reprompt: shouldEndSession ? undefined : {
                outputSpeech: {
                    type: 'PlainText',
                    text: 'What else would you like to know?'
                }
            }
        }
    };
}