BigNumber.gd

extends Node

## solution for dealing with Big Friggin Numbers

#value is stored as a list of ints 0-999
#if an int > 999, remainder is carried over to a new int
# 10 = [10]
# 100 = [100]
# 1000 = [0,1]
# 1234 = [234,1]
# 100,000 = [0,100]
# 1,000,000 = [0,0,1]
# 314,159 = [159,314]

class BigNumber:
	var value = IntArray([0])
	
	#(this should really be somewhere else)
	var suffix = ['','K','M','B','T','q', 'Q', 's', 'S', 'O', 'N', 'd', 'U', 'D', '!', '@', '#', '$', '%', '^', '&', '*', '**']
	
	
	#init the instance with a starting value
	func _init(value=[0]):
		self.value = value

	#return TRUE if V < this value
	func can_afford(V):
		if V.value.size() > self.value.size():
			return false
		elif V.value.size() == self.value.size():
			if V.value[V.value.size()-1] > self.value[self.value.size()-1]:
				return false
		return true


	#add the value of another BigNumber to this one
	func add_value(V):
		var v = V
		if V extends Value.BigNumber:
			v = V.value
		print("Adding "+V.get_display_value()+" to "+self.get_display_value())
		for i in range(v.size()):
			_add(i,v[i])


	#subtract the value of another BigNumber from this
	#(assumes the difference is >= 0)
	func spend_value(V):
		var v = V
		if V extends Value.BigNumber:
			v = V.value
		print("Subtracting "+V.get_display_value()+" from "+self.get_display_value())
		for i in range(v.size()):
			_sub(i,v[i])
		#print(self.value)



	func _add(P,V):
		#add value V to digit P
		var diff = P+1 - self.value.size()
		if diff > 0:
			for i in range(diff):
				if i == diff-1:
					self.value.append(V)
				else:
					self.value.append(0)
		else:
			var new_value = self.value[P] + V
			if new_value >= 1000:
				var A = int(new_value / 1000)
				self.value[P] = new_value - (1000*A)
				_add(P+1,A)
			else:
				self.value[P] = new_value
	
	func _sub(P,V):
		#subtract value V from digit P
		var new_value = self.value[P] - V
		if new_value < 0:
			self.value[P] = 1000+new_value
			_sub(P+1,max(1,new_value/1000))
		else:
			self.value[P] = new_value


	#return a string displaying the full number value (123,456,789)
	func get_full_display_value():
		var TXT = ""
		var len = self.value.size()-1
		while len >= 0:
			var S = str(self.value[len])
			if S.length() < 3 && len != self.value.size()-1:
				for i in range(3-S.length()):
					TXT += "0"
			TXT += S
			if len != 0:
				TXT += ","
			len -= 1
		return TXT


	#return a string displaying short-hand number value (123.45M)
	func get_display_value():
		var first = str(self.value[self.value.size()-1])
		var second = ""
		var TXT1 = first
		var TXT2 = ""
		if self.value.size() > 1:
			TXT1 += '.'
			second = str(self.value[self.value.size()-2])
			if second.length() < 3:
				for i in range(3-second.length()):
					TXT2 += "0"
		TXT2 += second
		return TXT1+TXT2.left(2)+self.suffix[self.value.size()-1]