import os
import sys
import asyncio
import json
from flask import Blueprint, request, jsonify
from flask_cors import cross_origin

# Add the virtual GPU path to sys.path
vgpu_path = os.path.join(os.path.dirname(__file__), '..', '..', '..', 'virtual_gpu_setup', 'virtual_gpu')
sys.path.insert(0, vgpu_path)

from vgpu import VirtualGPU
from vram import VRAM
from driver import GPUDriver
from render import Renderer
from ai import AIAccelerator
import numpy as np

# Import the Hugging Face GPT model from the same directory
from .huggingface_gpt_model import HuggingFaceModelManager

ai_chat_bp = Blueprint('ai_chat', __name__)

# Global variables to store GPU components
vgpu_instance = None
ai_accelerator = None
driver = None
hf_model_manager = None

def initialize_vgpu():
    """Initialize the virtual GPU components."""
    global vgpu_instance, ai_accelerator, driver, hf_model_manager
    
    if vgpu_instance is None:
        print("Initializing Virtual GPU with 500GB VRAM...")
        
        # Create VRAM (500GB - full virtual GPU capacity)
        vram = VRAM(memory_size_gb=500)
        
        # Create renderer
        renderer = Renderer(vram)
        
        # Create AI accelerator
        ai_accelerator = AIAccelerator(vram)
        
        # Create vGPU with 800 SMs and 50,000 cores
        vgpu_instance = VirtualGPU(num_sms=800, total_cores=50000)
        vgpu_instance.set_modules(vram, renderer, ai_accelerator, None)
        
        # Create driver
        driver = GPUDriver(vgpu_instance)
        vgpu_instance.driver = driver
        
        print("Virtual GPU initialized successfully!")
        print(f"VRAM: {vram.get_stats()['total_memory_gb']} GB")
        print(f"Cores: {vgpu_instance.total_cores:,}")
        print(f"SMs: {vgpu_instance.num_sms}")
        
        # Initialize the Hugging Face model manager
        print("Loading Hugging Face pre-trained model onto virtual GPU...")
        hf_model_manager = HuggingFaceModelManager(ai_accelerator)
        print("Hugging Face model loaded successfully!")

@ai_chat_bp.route('/chat', methods=['POST'])
@cross_origin()
def chat():
    """Handle chat requests using the Hugging Face pre-trained model."""
    global hf_model_manager
    
    try:
        # Initialize vGPU if not already done
        initialize_vgpu()
        
        # Get the message from request
        data = request.get_json()
        if not data or 'message' not in data:
            return jsonify({'error': 'No message provided'}), 400
        
        user_message = data['message']
        
        # Generate response using Hugging Face model on virtual GPU
        response = hf_model_manager.chat(user_message)
        
        # Get GPU stats
        vgpu_stats = vgpu_instance.get_stats()
        ai_stats = ai_accelerator.get_stats()
        vram_stats = vgpu_instance.vram.get_stats()
        
        # Get model info
        model_info = hf_model_manager.get_model_info()
        
        return jsonify({
            'response': response,
            'gpu_stats': {
                'clock_cycles': vgpu_stats['clock_cycle'],
                'tasks_processed': vgpu_stats['total_tasks_processed'],
                'busy_sms': vgpu_stats['busy_sms'],
                'total_sms': vgpu_stats['total_sms'],
                'ai_operations': ai_stats['operations_performed'],
                'flops_performed': ai_stats['flops_performed'],
                'vram_utilization': vram_stats['utilization_percent'],
                'matrices_in_memory': ai_stats['matrices_in_memory']
            },
            'model_info': model_info
        })
        
    except Exception as e:
        return jsonify({'error': f'Hugging Face model error: {str(e)}'}), 500

@ai_chat_bp.route('/gpu-status', methods=['GET'])
@cross_origin()
def gpu_status():
    """Get current GPU status."""
    try:
        initialize_vgpu()
        
        vgpu_stats = vgpu_instance.get_stats()
        ai_stats = ai_accelerator.get_stats()
        vram_stats = vgpu_instance.vram.get_stats()
        
        return jsonify({
            'vgpu': vgpu_stats,
            'ai_accelerator': ai_stats,
            'vram': vram_stats,
            'status': 'online'
        })
        
    except Exception as e:
        return jsonify({'error': f'Failed to get GPU status: {str(e)}'}), 500

@ai_chat_bp.route('/reset-gpu', methods=['POST'])
@cross_origin()
def reset_gpu():
    """Reset the virtual GPU."""
    global vgpu_instance, ai_accelerator, driver, ai_model
    
    try:
        vgpu_instance = None
        ai_accelerator = None
        driver = None
        ai_model = None
        
        return jsonify({'message': 'Virtual GPU reset successfully'})
        
    except Exception as e:
        return jsonify({'error': f'Failed to reset GPU: {str(e)}'}), 500