/**
 * AgentOS 2.0 - Base Agent Class
 * All department agents inherit from this class
 * Provides: memory, personality, voice, scoring, learning
 */

const fs = require('fs');
const path = require('path');
const apiCaller = require('../skills/api_caller');
const memory = require('../skills/memory');
const conversationMemory = require('../skills/conversation_memory');

const AGENTS_DB = path.join(__dirname, '../database/agents_db.json');
const METRICS_DB = path.join(__dirname, '../database/metrics_db.json');

class BaseAgent {
    constructor(config) {
        this.id = config.id;
        this.name = config.name;
        this.role = config.role;
        this.department = config.department;
        this.personality = config.personality;
        this.voice = config.voice;
        this.skills = config.skills || [];
        this.status = 'idle'; // idle, working, waiting, error
        this.lastActive = null;
        this.pulseInterval = config.pulseInterval || 15 * 60 * 1000; // 15 min default
        this.pulseTimer = null;
        
        // Load agent-specific memory
        this.agentMemory = this.loadAgentMemory();
        
        // Metrics
        this.metrics = {
            tasksCompleted: 0,
            tasksFailed: 0,
            avgScore: 0,
            totalActions: 0,
            learningLevel: 1
        };
        
        this.loadMetrics();
    }

    /**
     * Agent personality system - defines tone, style, behavior
     */
    getSystemPrompt() {
        return `You are ${this.name}, the ${this.role} in AgentOS.

PERSONALITY:
${this.personality.description}

VOICE & STYLE:
- Tone: ${this.personality.tone}
- Speaking style: ${this.personality.style}
- Emoji usage: ${this.personality.emojiUsage}
- Greeting: ${this.personality.greeting}
- Signoff: ${this.personality.signoff}

RESPONSIBILITIES:
${this.personality.responsibilities.join('\n')}

BEHAVIOR RULES:
1. Always be proactive - suggest next actions
2. Ask for feedback after completing tasks
3. Learn from user corrections
4. Score your own work (1-10) before submitting
5. If stuck, ask the CEO (APEX) for guidance
6. Maintain context across conversations
7. Document everything for legacy tracking

CURRENT CONTEXT:
- User: ${this.agentMemory.userProfile?.name || 'Unknown'}
- Company: ${this.agentMemory.userProfile?.company || 'Unknown'}
- Goals: ${JSON.stringify(this.agentMemory.userProfile?.goals || [])}
- Preferences: ${JSON.stringify(this.agentMemory.userProfile?.preferences || {})}`;
    }

    /**
     * Load agent-specific memory from DB
     */
    loadAgentMemory() {
        try {
            const db = JSON.parse(fs.readFileSync(AGENTS_DB, 'utf8'));
            return db.agents?.[this.id] || {
                userProfile: {},
                conversationHistory: [],
                learnedPatterns: [],
                feedbackHistory: [],
                skillLevels: {}
            };
        } catch (e) {
            return { userProfile: {}, conversationHistory: [], learnedPatterns: [], feedbackHistory: [], skillLevels: {} };
        }
    }

    /**
     * Save agent memory
     */
    saveAgentMemory() {
        try {
            const db = JSON.parse(fs.readFileSync(AGENTS_DB, 'utf8')) || { agents: {} };
            db.agents[this.id] = this.agentMemory;
            fs.writeFileSync(AGENTS_DB, JSON.stringify(db, null, 2));
            return true;
        } catch (e) {
            console.error(`[${this.name}] Failed to save memory:`, e.message);
            return false;
        }
    }

    /**
     * Load metrics from DB
     */
    loadMetrics() {
        try {
            const db = JSON.parse(fs.readFileSync(METRICS_DB, 'utf8'));
            const agentMetrics = db.agents?.[this.id];
            if (agentMetrics) {
                this.metrics = { ...this.metrics, ...agentMetrics };
            }
        } catch (e) {
            // No metrics yet
        }
    }

    /**
     * Save metrics
     */
    saveMetrics() {
        try {
            const db = JSON.parse(fs.readFileSync(METRICS_DB, 'utf8')) || { agents: {}, timestamp: new Date().toISOString() };
            db.agents[this.id] = this.metrics;
            db.timestamp = new Date().toISOString();
            fs.writeFileSync(METRICS_DB, JSON.stringify(db, null, 2));
            return true;
        } catch (e) {
            console.error(`[${this.name}] Failed to save metrics:`, e.message);
            return false;
        }
    }

    /**
     * Score an action (1-10)
     */
    scoreAction(action, score, feedback = '') {
        const record = {
            action,
            score,
            feedback,
            timestamp: new Date().toISOString(),
            agent: this.id
        };

        // Update running average
        const totalActions = this.metrics.totalActions + 1;
        this.metrics.avgScore = ((this.metrics.avgScore * this.metrics.totalActions) + score) / totalActions;
        this.metrics.totalActions = totalActions;

        // Store in feedback history
        this.agentMemory.feedbackHistory.push(record);
        if (this.agentMemory.feedbackHistory.length > 100) {
            this.agentMemory.feedbackHistory = this.agentMemory.feedbackHistory.slice(-100);
        }

        this.saveMetrics();
        this.saveAgentMemory();

        console.log(`[${this.name}] Action scored: ${score}/10 - ${action}`);
        return record;
    }

    /**
     * Learn from feedback
     */
    async learnFromFeedback(task, feedback, correction) {
        const learning = {
            task,
            feedback,
            correction,
            timestamp: new Date().toISOString(),
            lesson: await this.extractLesson(task, feedback, correction)
        };

        this.agentMemory.learnedPatterns.push(learning);
        this.metrics.learningLevel = Math.min(10, Math.floor(this.agentMemory.learnedPatterns.length / 5) + 1);
        
        this.saveAgentMemory();
        this.saveMetrics();

        console.log(`[${this.name}] Learned: ${learning.lesson}`);
        return learning;
    }

    /**
     * Extract lesson from feedback using AI
     */
    async extractLesson(task, feedback, correction) {
        const prompt = [
            { role: 'system', content: 'Extract a concise lesson from this feedback. Max 1 sentence.' },
            { role: 'user', content: `Task: ${task}\nFeedback: ${feedback}\nCorrection: ${correction}\n\nLesson:` }
        ];

        const result = await apiCaller.callOpenRouter(prompt, 'meta-llama/llama-3.3-70b-instruct:free');
        return result.success ? result.data : 'Learned from feedback';
    }

    /**
     * Execute a task with scoring
     */
    async execute(task, options = {}) {
        const startTime = Date.now();
        this.status = 'working';
        this.lastActive = new Date().toISOString();

        try {
            // Pre-task: Check context
            const context = await this.gatherContext(task);
            
            // Execute task using appropriate skill
            const result = await this.performTask(task, context, options);
            
            // Self-score before user feedback
            const selfScore = await this.selfScore(result);
            
            // Post-task: Update metrics
            this.metrics.tasksCompleted++;
            const duration = ((Date.now() - startTime) / 1000).toFixed(2);
            
            this.status = 'idle';
            
            return {
                success: true,
                agent: this.name,
                result,
                selfScore,
                duration,
                timestamp: new Date().toISOString()
            };
        } catch (error) {
            this.metrics.tasksFailed++;
            this.status = 'error';
            
            return {
                success: false,
                agent: this.name,
                error: error.message,
                timestamp: new Date().toISOString()
            };
        } finally {
            this.saveMetrics();
        }
    }

    /**
     * Gather context for task (RAG-style)
     */
    async gatherContext(task) {
        const context = {
            userProfile: this.agentMemory.userProfile,
            relevantHistory: this.agentMemory.conversationHistory.slice(-10),
            learnedPatterns: this.agentMemory.learnedPatterns.slice(-5),
            similarTasks: await this.findSimilarTasks(task)
        };
        return context;
    }

    /**
     * Find similar tasks from history
     */
    async findSimilarTasks(task) {
        // Simple keyword matching - can be enhanced with vector search
        const history = this.agentMemory.conversationHistory;
        const taskKeywords = task.toLowerCase().split(' ').filter(w => w.length > 4);
        
        return history.filter(h => 
            taskKeywords.some(k => h.content?.toLowerCase().includes(k))
        ).slice(-3);
    }

    /**
     * Self-score result before user feedback
     */
    async selfScore(result) {
        const prompt = [
            { role: 'system', content: 'Score this task result from 1-10 based on completeness and quality.' },
            { role: 'user', content: `Result: ${JSON.stringify(result).substring(0, 500)}\n\nScore (1-10):` }
        ];

        const res = await apiCaller.callOpenRouter(prompt, 'meta-llama/llama-3.3-70b-instruct:free');
        const score = parseInt(res.data.match(/\d+/)?.[0]) || 5;
        return Math.min(10, Math.max(1, score));
    }

    /**
     * Abstract method - override in subclasses
     */
    async performTask(task, context, options) {
        throw new Error('performTask must be implemented by subclass');
    }

    /**
     * Start pulse/heartbeat
     */
    startPulse() {
        if (this.pulseTimer) clearInterval(this.pulseTimer);
        
        this.pulseTimer = setInterval(() => {
            this.pulse();
        }, this.pulseInterval);
        
        console.log(`[${this.name}] Pulse started (${this.pulseInterval/1000}s interval)`);
    }

    /**
     * Pulse heartbeat - check pending tasks
     */
    async pulse() {
        console.log(`[${this.name}] Pulse check at ${new Date().toISOString()}`);
        // Override in subclasses for specific pulse behavior
    }

    /**
     * Stop pulse
     */
    stopPulse() {
        if (this.pulseTimer) {
            clearInterval(this.pulseTimer);
            this.pulseTimer = null;
            console.log(`[${this.name}] Pulse stopped`);
        }
    }

    /**
     * Get agent status
     */
    getStatus() {
        return {
            id: this.id,
            name: this.name,
            role: this.role,
            status: this.status,
            lastActive: this.lastActive,
            metrics: this.metrics,
            learningLevel: this.metrics.learningLevel
        };
    }

    /**
     * Interview user to learn preferences
     */
    async interviewUser(chatId, topic = 'general') {
        const questions = await this.generateInterviewQuestions(topic);
        
        return {
            agent: this.name,
            topic,
            questions,
            instructions: 'Answer these questions to help me understand your needs better.'
        };
    }

    /**
     * Generate interview questions
     */
    async generateInterviewQuestions(topic) {
        const prompt = [
            { role: 'system', content: `You are ${this.name}. Generate 5 interview questions to understand user's ${topic} needs.` },
            { role: 'user', content: `Generate 5 concise questions about: ${topic}` }
        ];

        const result = await apiCaller.callOpenRouter(prompt, 'meta-llama/llama-3.3-70b-instruct:free');
        return result.success ? result.data.split('\n').filter(q => q.trim()) : [];
    }
}

module.exports = BaseAgent;