REG_STATUS_TO_COLOR = {
	"insert": "green",
	"change": "yellow",
	"remove": "red",
	"none":   "black",
	"jump":   "orange"
}

class TikzPainter:

	def __init__ (self, registers=None, max_stack_size=8):
		self.registers = registers if registers else REGISTERS
		self.text = []
		self.pos_x = 0
		self.max_stack_size = max_stack_size

	def addText (self, str, *args):
		self.text.append(str.format(*args))

	def getRegColor (self, reg_state):
		return REG_STATUS_TO_COLOR[reg_state]

	def drawState (self, emu, line_nr=None):
		x = (self.pos_x+1)*2.5-0.5
		self.pos_x += 1

		# Draw register cells
		pos = 0.5
		for reg_name in self.registers:
			pos -= 0.5
			if reg_name =="":
				continue
			reg_state = emu.regState(reg_name)
			reg_dect = "register_node, fill="+self.getRegColor(reg_state)+"!10"
			self.addText("\t\\node[{}]() at ({}, {}){{{}}};\n",
					reg_dect, x, pos, emu.getVal(reg_name))

		# Draw stack
		pos -= 1.5
		base_sp = max(emu.last_sp, emu.getVal('%rsp'))
		if emu.last_sp - 1 == emu.getVal('%rsp'):
			pos += 0.5
		for index in range(base_sp, max(-1, base_sp-self.max_stack_size),-1):
			reg_state = emu.regState("m"+str(index))
			reg_dect = "register_node, fill="+self.getRegColor(reg_state)+"!10"
			self.addText("\t\\node[{}]() at ({}, {}){{{}}};\n",
					reg_dect, x, pos, emu.stack[index])
			pos -= 0.5

		# Draw line signature
		if line_nr == None:
			return
		pos = 2
		signature = emu.getLineSignature(line_nr)
		for token in signature:
			self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n", x-1.25, pos, token)
			pos -= 0.5

	def drawNames (self, emu):
		x = 0
		pos = 0
		for reg_name in self.registers:
			self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n", x, pos, reg_name[1:])
			pos -= 0.5

		self.addText("\t\\node[text_node]() at ({}, {}){{TOS+1}};\n", x, pos-0.5)
		self.addText("\t\\node[text_node]() at ({}, {}){{TOS}};\n", x, pos-1.0)
		pos -= 1
		for index in range(1,self.max_stack_size):
			pos -= 0.5
			self.addText("\t\\node[text_node]() at ({}, {}){{TOS-{}}};\n", x, pos, index)

	def __str__ (self):
		return "".join(self.text)