import queue
from Memory import Memory
from error import *
import pathlib
import program
import importlib


class Core:
    def __init__(self, id, registers: int, dtMemory: int, cmdMemory: int):
        self.id = id
        # 创建存储器
        self.registers = Memory(registers)
        self.dtMemory = Memory(dtMemory)
        self.cmdMemory = Memory(cmdMemory)

        # 设置存储器
        self.registers.name = f"寄存器 - Core{id}"
        self.dtMemory.name = f"数据内存 - Core{id}"
        self.cmdMemory.name = f"程序内存 - Core{id}"

        self.pc = 0  # 程序计数器
        self.stack = queue.LifoQueue(maxsize=10 * self.registers.size)  # 栈

        self.ASMs = {}

        for file in pathlib.Path("ASM").iterdir():
            if file.is_dir():
                continue
                
            if str(file).split('.')[-1] not in ['py', 'pyc', 'pyd', 'so']:
                continue
            module = "ASM." + file.name.split(".")[0]
            module = importlib.import_module(module)
            for cmd in module.CMDs:
                self.ASMs[cmd] = module

    def loadProgram(self, code):
        # 加载程序至cmdMemroy
        self.cmdMemory.write_batch(0,code)

    def fetchInstruction(self):
        # 取指令
        if self.pc < len(self.cmdMemory):
            instruction = self.cmdMemory[self.pc]
            self.pc += 1
            return instruction
        else:
            return None  # 返回None表示程序已经执行完毕

    def init(self):
        # 初始化内存和寄存器
        self.pc = 0
        self.dtMemory.init()
        self.registers.init()

    def executeInstruction(self, instruction):
        # 执行指令
        if instruction is None:
            return False  # 程序已执行完毕，返回False
        
        lists = instruction.split(" ")

        # 解析指令
        opcode = lists[0]  # 操作码
        operand = program.Operand(lists[1:], self)  # 操作数

        if opcode in self.ASMs:
            ins = getattr(self.ASMs[opcode], opcode)
            ret = ins(self, operand)
            if ret is None:
                return True
            elif ret is False:
                return False
            else:
                return True
            
        else:
            
            raise InvalidInstruction(instruction)

    def run(self):
        # 开始执行
        while True:
            instruction = self.fetchInstruction()
            if not self.executeInstruction(instruction):
                break


class MultiCoreCPU:
    def __init__(self, num_cores, registers, dt_memory, cmd_memory_size=-1):
        self.cores = []

        self.programs = queue.Queue(maxsize=num_cores)
        if cmd_memory_size <= 0:
            cmd_memory_size = dt_memory.size
        for i in range(num_cores):
            cmdMem = Memory(cmd_memory_size)
            core = Core(i, registers, dt_memory, cmdMem)
            self.cores.append(core)

    def load_program(self, program):
        self.programs.put_nowait(program)

    def run(self):
        oldCore = -1
        while not self.programs.empty():
            oldCore += 1
            self.cores[oldCore].loadProgram(self.programs.get())

    def halt(self):
        for core in self.cores:
            core.is_running = False


class CPU(Core):
    def __init__(self, registers, dtMemory, cmdMemory):
        super().__init__(0, registers, dtMemory, cmdMemory)


if __name__ == "__main__":
    cpu = CPU(registers=64, dtMemory=1024, cmdMemory=10)
    program.Operand(["r0"], cpu)[0].set(2)
    f = open('Example/加法器.txt')
    code = f.read().split('\n')
    cpu.loadProgram(code)
    cpu.dtMemory.write_batch(0, [0, 1])
    cpu.run()
    # print(cpu.registers[0])