/**
 * ClinicAgent: An agentic orchestrator for Curio.
 * It uses natural language understanding to map user requests to hospital tools.
 */

const patientManager = require('./patientManager');
const queueManager = require('./queueManager');
const pharmacyAgent = require('./pharmacyAgent');
const configManager = require('./configManager');
const Anthropic = require('@anthropic-ai/sdk');

const anthropic = new Anthropic({
    apiKey: process.env.ANTHROPIC_API_KEY, // Defaults to process.env.ANTHROPIC_API_KEY
});
const LLM_MODEL = process.env.LLM_MODEL || 'claude-3-haiku-20240307';

class ClinicAgent {
    getSystemPrompt() {
        const today = new Date().toISOString().split('T')[0];
        return `
        You are 'Curio AI', the highly empathetic and intelligent medical assistant for Curio Health.
        Today's date is ${today}.
        
        Your goal is to help patients book, cancel, or reschedule appointments, and answer basic clinic questions.
        Be extremely concise, warm, empathetic, and natural. Do not use markdown formatting.
        
        AVAILABLE CLINICS/DEPARTMENTS:
        - Cardiology (Dr. Sharma)
        - General Medicine (Apollo)
        - Pediatrics
        - Orthopedics

        INTENT 1: BOOKING
        To book an appointment, you MUST collect:
        1. Department/Clinic
        2. Date (Format as YYYY-MM-DD)
        3. Time (Format as HH:MM)

        If any booking info is missing, naturally ask the user. Do NOT output JSON until you have ALL THREE pieces.
        If you have all three, reply with ONLY JSON:
        {"action": "BOOK", "department": "Cardiology", "date": "${today}", "time": "10:00"}

        INTENT 2: CANCEL
        If they want to cancel, ask them to confirm the date and time of the appointment they want to cancel. Once confirmed, reply with ONLY JSON:
        {"action": "CANCEL", "date": "${today}", "time": "10:00"}
        
        INTENT 3: GENERAL QUERY
        If they ask general questions (e.g., location, hours), just answer naturally as the assistant. If they express pain or worry, respond with empathy before helping them.
        `;
    }

    async processMessage(phone, transcript) {
        console.log(`[Agent] Processing for ${phone} via Claude`);

        try {
            const response = await anthropic.messages.create({
                model: LLM_MODEL,
                max_tokens: 300,
                temperature: 0.2,
                system: this.getSystemPrompt(),
                messages: transcript
            });

            const replyContent = response.content[0].text.trim();

            // Try to parse JSON intent
            try {
                const cleanJson = replyContent.replace(/```json/g, '').replace(/```/g, '').trim();
                const intent = JSON.parse(cleanJson);
                
                if (intent.action === 'BOOK') {
                    let timeVal = "10:00"; 
                    const timeMatch = intent.time.match(/(\d{1,2}:\d{2})/);
                    if (timeMatch) timeVal = timeMatch[1];
                    
                    let dateVal = new Date().toISOString().split('T')[0];
                    if (intent.date && intent.date.match(/^\d{4}-\d{2}-\d{2}$/)) {
                        dateVal = intent.date;
                    }
                    
                    let tenantId = 'sharma-clinic'; // Default
                    if (intent.department && intent.department.toLowerCase().includes('general')) tenantId = 'apollo-hospitals';

                    const result = await queueManager.bookOnline(dateVal, timeVal, phone, tenantId);
                    if (result.success) {
                        return { reply: `Awesome! Your appointment for ${intent.department} is booked for ${dateVal} at ${timeVal}. Your token is ${result.token}. We look forward to seeing you!` };
                    } else {
                        return { reply: `I'm so sorry, but ${result.message.toLowerCase()} Would you like to try a different time or day?` };
                    }
                } else if (intent.action === 'CANCEL') {
                    let dateVal = intent.date || new Date().toISOString().split('T')[0];
                    let timeVal = intent.time || "10:00";
                    const result = await queueManager.cancelBooking(dateVal, timeVal, 'sharma-clinic');
                    if (result.success) {
                        return { reply: `Done. I've cancelled your appointment for ${dateVal} at ${timeVal}. Let me know if you need to book a new one!` };
                    } else {
                        return { reply: `Hmm, I couldn't find a booking for ${dateVal} at ${timeVal} to cancel. Could you double-check the time for me?` };
                    }
                }
            } catch (e) {
                // Not JSON, just regular conversational text
                return { reply: replyContent };
            }
            
            return { reply: replyContent };
        } catch (error) {
            console.error('[ClinicAgent] LLM Error:', error.message);
            return { reply: "I'm having trouble connecting to my AI brain right now. Please try again in a moment." };
        }
    }
}

module.exports = new ClinicAgent();