"""
Hardware Abstraction Layer (HAL) for VGPU
Bridges Helium to physical hardware through driver abstraction
"""
from typing import Dict, List, Optional, Union, Tuple
import array
from enum import Enum

class HardwareType(Enum):
    COMPUTE_UNIT = "compute_unit"
    TENSOR_CORE = "tensor_core"
    SHADER_UNIT = "shader_unit"
    MEMORY_CONTROLLER = "memory_controller"
    DMA_ENGINE = "dma_engine"

class VGPUHardwareState:
    """Tracks physical hardware state"""
    def __init__(self):
        self.compute_units = []
        self.tensor_cores = []
        self.shader_units = []
        self.memory_controllers = []
        self.dma_engines = []
        self.clock_speed = 0
        self.memory_frequency = 0
        self.power_state = "idle"
        
class HardwareAbstractionLayer:
    """
    Hardware Abstraction Layer
    Maps high-level operations to hardware instructions
    
    Hardware Stack:
    Helium → HAL → Driver → Hardware Components
    """
    def __init__(self):
        self.hw_state = VGPUHardwareState()
        self.instruction_queue = []
        self.memory_map = {}
        self.hardware_queues = {
            HardwareType.COMPUTE_UNIT: [],
            HardwareType.TENSOR_CORE: [],
            HardwareType.SHADER_UNIT: [],
            HardwareType.MEMORY_CONTROLLER: [],
            HardwareType.DMA_ENGINE: []
        }
        
    def queue_instruction(self, hw_type: HardwareType, instruction: Dict):
        """Queue instruction for specific hardware component"""
        self.hardware_queues[hw_type].append(instruction)
        
    def flush_queues(self):
        """Execute all queued instructions"""
        for hw_type, queue in self.hardware_queues.items():
            while queue:
                instr = queue.pop(0)
                self._execute_instruction(hw_type, instr)
                
    def _execute_instruction(self, hw_type: HardwareType, instruction: Dict):
        """Execute single hardware instruction"""
        if hw_type == HardwareType.COMPUTE_UNIT:
            self._execute_compute(instruction)
        elif hw_type == HardwareType.TENSOR_CORE:
            self._execute_tensor_op(instruction)
        elif hw_type == HardwareType.SHADER_UNIT:
            self._execute_shader(instruction)
        elif hw_type == HardwareType.MEMORY_CONTROLLER:
            self._execute_memory_op(instruction)
        elif hw_type == HardwareType.DMA_ENGINE:
            self._execute_dma(instruction)
            
    def _execute_compute(self, instruction: Dict):
        """Execute general compute instruction"""
        op_type = instruction['op']
        if op_type == 'add':
            self._hw_add(instruction['src1'], instruction['src2'], instruction['dst'])
        elif op_type == 'mul':
            self._hw_multiply(instruction['src1'], instruction['src2'], instruction['dst'])
        elif op_type == 'div':
            self._hw_divide(instruction['src1'], instruction['src2'], instruction['dst'])
            
    def _execute_tensor_op(self, instruction: Dict):
        """Execute tensor operation on tensor cores"""
        op_type = instruction['op']
        if op_type == 'matmul':
            self._hw_matmul(instruction['mat1'], instruction['mat2'], instruction['dst'])
        elif op_type == 'transform':
            self._hw_transform(instruction['input'], instruction['weights'], instruction['dst'])
            
    def _execute_shader(self, instruction: Dict):
        """Execute shader program"""
        shader_type = instruction['type']
        if shader_type == 'compute':
            self._hw_compute_shader(instruction['program'], instruction['inputs'])
        elif shader_type == 'pixel':
            self._hw_pixel_shader(instruction['program'], instruction['fragments'])
            
    def _execute_memory_op(self, instruction: Dict):
        """Execute memory operation"""
        op_type = instruction['op']
        if op_type == 'load':
            self._hw_load(instruction['src'], instruction['dst'])
        elif op_type == 'store':
            self._hw_store(instruction['src'], instruction['dst'])
        elif op_type == 'copy':
            self._hw_memcpy(instruction['src'], instruction['dst'], instruction['size'])
            
    def _execute_dma(self, instruction: Dict):
        """Execute DMA transfer"""
        transfer_type = instruction['type']
        if transfer_type == 'h2d':  # Host to Device
            self._hw_dma_h2d(instruction['src'], instruction['dst'], instruction['size'])
        elif transfer_type == 'd2h':  # Device to Host
            self._hw_dma_d2h(instruction['src'], instruction['dst'], instruction['size'])
            
    # Hardware-level operations
    def _hw_add(self, src1, src2, dst):
        """Hardware add operation"""
        pass  # Hardware implementation
        
    def _hw_multiply(self, src1, src2, dst):
        """Hardware multiply operation"""
        pass  # Hardware implementation
        
    def _hw_divide(self, src1, src2, dst):
        """Hardware divide operation"""
        pass  # Hardware implementation
        
    def _hw_matmul(self, mat1, mat2, dst):
        """Hardware matrix multiplication"""
        pass  # Hardware implementation
        
    def _hw_transform(self, input_data, weights, dst):
        """Hardware tensor transformation"""
        pass  # Hardware implementation
        
    def _hw_compute_shader(self, program, inputs):
        """Hardware compute shader execution"""
        pass  # Hardware implementation
        
    def _hw_pixel_shader(self, program, fragments):
        """Hardware pixel shader execution"""
        pass  # Hardware implementation
        
    def _hw_load(self, src, dst):
        """Hardware memory load"""
        pass  # Hardware implementation
        
    def _hw_store(self, src, dst):
        """Hardware memory store"""
        pass  # Hardware implementation
        
    def _hw_memcpy(self, src, dst, size):
        """Hardware memory copy"""
        pass  # Hardware implementation
        
    def _hw_dma_h2d(self, src, dst, size):
        """Hardware DMA host to device"""
        pass  # Hardware implementation
        
    def _hw_dma_d2h(self, src, dst, size):
        """Hardware DMA device to host"""
        pass  # Hardware implementation
