"""
Advanced CPU core implementation with electron speed and flip-flop integration.
"""

from electron_speed import (drift_velocity, transit_time, max_switch_freq,
                          VOLTAGE, CHANNEL_LENGTH, SILICON_MOBILITY)
from flip_flops import DFlipFlop, SRFlipFlop, JKFlipFlop, TFlipFlop
from logic_gates import NANDGate, ANDGate, ORGate, NOTGate, VDD, VSS, VTH
import time
import hashlib
import struct

class ExecutionUnit:
    def __init__(self):
        # Pipeline registers using voltage-based storage
        self.result_storage = []
        self.control_signals = []
        
        # Clock speed based on electron drift
        self.clock_period = transit_time  # From electron speed calculations
        self.switches_per_cycle = int(max_switch_freq * transit_time)
        
        # Voltage level tracking
        self.vdd = VDD
        self.vss = VSS
        self.high = self.vdd
        self.low = self.vss
        
        # ALU components
        self.alu_nand = NANDGate()
        self.alu_and = ANDGate()
        self.alu_or = ORGate()
        self.alu_not = NOTGate()
        
    def update_clock(self):
        """Update internal clock based on electron drift velocity"""
        # Each clock cycle advances by electron transit time
        cycle_time = self.clock_period
        # Allow multiple operations per cycle based on switching speed
        return cycle_time, self.switches_per_cycle

class ParallelExecutionCore:
    def __init__(self, num_units=8):
        self.exec_units = [ExecutionUnit() for _ in range(num_units)]
        
        # Initialize voltage-based storage
        self.result_storage = []
        self.control_signals = []
        
        # Voltage levels
        self.vdd = VDD
        self.vss = VSS
        self.high = self.vdd
        self.low = self.vss
        
    def execute_hash_round(self, data):
        """Execute one SHA-256 round with parallel units"""
        # Split work across execution units
        unit_results = []
        cycle_time, ops_per_cycle = self.exec_units[0].update_clock()
        
        for i, unit in enumerate(self.exec_units):
            # Process multiple operations per cycle
            for _ in range(ops_per_cycle):
                # Toggle unit busy flip-flop
                self.unit_busy[i].update(VDD, VSS)
                
                # Execute portion of hash calculation
                chunk_size = len(data) // len(self.exec_units)
                start = i * chunk_size
                end = start + chunk_size
                
                # Perform SHA-256 chunk operation
                result = hashlib.sha256(data[start:end]).digest()
                
                # Store result directly in voltage-level storage
                self.result_storage.append(result)
                unit_results.append(result)
                
                # Signal completion with voltage levels
                self.control_signals.append(self.high)
                
        # Combine results
        final_result = b''.join(unit_results)
        return final_result

class AdvancedMiningCore:
    def __init__(self, num_parallel_cores=16):
        self.parallel_cores = [ParallelExecutionCore() for _ in range(num_parallel_cores)]
        self.block_header = bytearray(80)  # Standard Bitcoin block header
        
    def mine_block(self, target_difficulty):
        """Mine using parallel cores with electron-speed clock"""
        nonce = 0
        while True:
            # Update nonce in block header
            struct.pack_into('<I', self.block_header, 76, nonce)
            
            # Distribute work across parallel cores
            results = []
            for core in self.parallel_cores:
                result = core.execute_hash_round(self.block_header)
                results.append(result)
            
            # Check if any core found a valid hash
            for result in results:
                if int.from_bytes(result, 'big') < target_difficulty:
                    return nonce, result
                    
            nonce += len(self.parallel_cores)  # Update by number of parallel attempts