"""
Bitcoin Mining Pipeline
Integrates Bitcoin protocol with hardware acceleration
"""
from src.core.bitcoin import BitcoinMiner, BitcoinBlock, BTCWallet
from src.hardware.hardware_manager import HardwareManager
from src.utils.logger import Logger
from cpu.enhanced_cpu import CPUGrid, CPUGroupType, CPUInstruction, InstructionType
import numpy as np
import hashlib
import struct
import time
from typing import Optional, Dict, Tuple

class BitcoinMiningPipeline:
    def __init__(self, wallet_private_key: Optional[str] = None):
        self.logger = Logger()
        self.cpu_grid = CPUGrid()
        self.hardware = HardwareManager()
        self.bitcoin_miner = BitcoinMiner()
        self.wallet = BTCWallet(wallet_private_key)
        
        # Initialize mining state
        self.current_block: Optional[BitcoinBlock] = None
        self.current_target: Optional[int] = None
        self.nonce_ranges: Dict[int, Tuple[int, int]] = {}  # CPU_id -> (start, end)
        
    def initialize(self):
        """Initialize the mining pipeline"""
        self.logger.info("Initializing Bitcoin mining pipeline...")
        
        # Initialize hardware
        self.hardware.initialize()
        
        # Get computation CPUs for mining
        self.computation_cpus = []
        for cpu_id in range(500, 1000):  # Computation group
            cpu = self.cpu_grid.get_cpu(cpu_id)
            if cpu:
                self.computation_cpus.append(cpu)
        
        self.logger.info(f"Mining with {len(self.computation_cpus)} computation CPUs")
        self.logger.info(f"Mining to wallet address: {self.wallet.get_address()}")

    def prepare_block_template(self, prev_hash: str, transactions: list) -> None:
        """Prepare a new block for mining"""
        # Calculate merkle root from transactions
        merkle_root = self._calculate_merkle_root(transactions)
        
        # Get current network difficulty bits
        bits = self._get_network_difficulty()
        
        # Prepare block
        self.bitcoin_miner.prepare_block(prev_hash, merkle_root, bits)
        self.current_block = self.bitcoin_miner.block
        self.current_target = self.bitcoin_miner.target

    def _calculate_merkle_root(self, transactions: list) -> str:
        """Calculate merkle root from transaction list"""
        if not transactions:
            return "0" * 64
            
        def hash_pair(hash1: str, hash2: str) -> str:
            # Double SHA256 of the concatenated hashes
            concat = bytes.fromhex(hash1) + bytes.fromhex(hash2)
            return hashlib.sha256(hashlib.sha256(concat).digest()).hexdigest()

        # First transaction is coinbase
        merkle_hashes = [tx['hash'] for tx in transactions]
        
        while len(merkle_hashes) > 1:
            if len(merkle_hashes) % 2 != 0:
                merkle_hashes.append(merkle_hashes[-1])
            merkle_hashes = [
                hash_pair(merkle_hashes[i], merkle_hashes[i + 1])
                for i in range(0, len(merkle_hashes), 2)
            ]
            
        return merkle_hashes[0]

    def _get_network_difficulty(self) -> int:
        """Get current network difficulty bits"""
        # Implementation to fetch network difficulty
        # For now using a fixed difficulty
        return 0x1d00ffff

    def distribute_mining_work(self):
        """Distribute mining work across CPUs"""
        if not self.current_block:
            raise RuntimeError("No block template prepared")

        # Get block header template
        header_template = self.current_block.get_header()
        
        # Calculate nonce ranges for each CPU
        nonces_per_cpu = (2**32) // len(self.computation_cpus)
        
        for i, cpu in enumerate(self.computation_cpus):
            start_nonce = i * nonces_per_cpu
            end_nonce = start_nonce + nonces_per_cpu if i < len(self.computation_cpus) - 1 else 2**32
            self.nonce_ranges[cpu.cpu_id] = (start_nonce, end_nonce)
            
            # Create mining instruction
            instruction = CPUInstruction(
                type=InstructionType.ARITHMETIC,
                opcode=0x01,  # Mining computation
                operands=[start_nonce, end_nonce],
                data=header_template
            )
            
            # Schedule the instruction
            cpu.schedule_instruction(instruction)

    def process_mining_result(self, cpu_id: int, nonce: int, block_hash: str) -> bool:
        """Process mining result from a CPU"""
        if self.bitcoin_miner.verify_hash(int(block_hash, 16)):
            # Valid block found!
            self.logger.info(f"Block found! Nonce: {nonce}, Hash: {block_hash}")
            
            # Update block with winning nonce
            self.current_block.nonce = nonce
            
            # Sign block with our wallet
            self._sign_block(self.current_block)
            
            return True
        return False

    def _sign_block(self, block: BitcoinBlock) -> None:
        """Sign a mined block with our wallet"""
        block_header = block.get_header()
        signature = self.wallet.sign_message(block_header)
        # Add signature to block (implementation depends on Bitcoin protocol version)

    def start_mining(self):
        """Start the mining process"""
        self.logger.info("Starting Bitcoin mining operations...")
        
        while True:
            try:
                # Get new block template
                self.prepare_block_template(
                    prev_hash="000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
                    transactions=[]  # Add transaction handling
                )
                
                # Distribute work
                self.distribute_mining_work()
                
                # Monitor hardware
                status = self.monitor_status()
                self.logger.info(f"Mining Status: {status}")
                
                # Sleep briefly to prevent busy-waiting
                time.sleep(1)
                
            except Exception as e:
                self.logger.error(f"Mining error: {str(e)}")
                time.sleep(5)

    def monitor_status(self) -> Dict:
        """Monitor mining status"""
        cpu_status = {
            'active_cpus': sum(1 for cpu in self.computation_cpus if cpu.busy_cores > 0),
            'total_cpus': len(self.computation_cpus),
            'total_hash_rate': self._calculate_hash_rate(),
            'target': hex(self.current_target) if self.current_target else None,
            'wallet_address': self.wallet.get_address()
        }

        hardware_status = self.hardware.monitor_hardware_status()

        return {
            'cpu_status': cpu_status,
            'hardware_status': hardware_status
        }

    def _calculate_hash_rate(self) -> float:
        """Calculate current hash rate"""
        # Implementation for hash rate calculation
        # Based on CPU performance metrics
        return 0.0  # TODO: Implement actual calculation

    def cleanup(self):
        """Cleanup mining resources"""
        self.logger.info("Shutting down Bitcoin mining pipeline...")
        self.cpu_grid.shutdown()
        self.hardware.cleanup_resources()
