from components.ijvm import ijvm

class Ram:
	
	def __init__(self,components,size):
		self.data=dict()
		self.lastAddr=size-1
		self.c=components
	
	def loadRamFile(self,filepath):
		"""
			Load a Ram file into self.data
		"""
		data=dict()
		addr=0
		f=open(filepath,"r")
		for line in f.readlines():
			line=line.rstrip() # remove \n
			if line in ijvm:
				data[addr]=int(ijvm[line])
			else:
				try:
					value=int(line,0)
				except:
					raise ValueError("Invalide RAM entry: Address {} value {}".format(addr,line))
				if value>255:
					raise ValueError("Ram contain values that does not fit in a byte: value {} at address {}".format(value,addr)) 
				data[addr]=value
			addr+=1
		f.close()
		self.data=data
	
	def write(self):
		"""
			Write data to memory based Mic-1 architecture
		"""
		addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
		if addr>self.lastAddr:
			raise ValueError("You get out of the ram by trying to set a value at address {}, max address is {}".format(addr,self.lastAddr))
		#### Little endian ####
		self.data[addr]=self.c["MDR"] & 0xFF
		self.data[addr+1]=self.c["MDR"] & 0xFF00
		self.data[addr+2]=self.c["MDR"] & 0xFF0000
		self.data[addr+3]=self.c["MDR"] & 0xFF000000

	
	def read(self):
		"""
			Read data from memory based Mic-1 architecture
		"""
		addr=self.c["MAR"]*4 # Don't forget MAR address 32bits block of memory
		value=None
		try:
			#### Little endian ####
			value=(self.data[addr+3]<<24)|(self.data[addr+2]<<16)|(self.data[addr+1]<<8)|self.data[addr]
		except:
			if addr>self.lastAddr:
				raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
		if(value==None):
			return(0)
		return(value)
		
	def fetch(self):
		"""
			Fetch next byte from memory based Mic-1 architecture
		"""
		addr=self.c["PC"]
		value=None
		try:
			value=self.data[addr]
		except:
			if addr>self.lastAddr:
				raise ValueError("You get out of the ram by trying to get value at address {}, max address is {}".format(addr,self.lastAddr))
		if(value==None):
			return(0)
		return(value)
		
	def dump(self):
		"""
			Simple dump helper
		"""
		for key,value in self.data.items():
			#print("{}:{}".format(key,bin(value)[2:]))
			print("{}:{}".format(key,value))
		
	def dumpRange(self,start,end,step):
		"""
			Another dump helper
		"""
		for i in range(start,end+1,step):
			try:
				print("{}:{}".format(i,self.data[i]))
			except:
				print("{}:0".format(i))