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gamemodes/ixhl2rp/plugins/cid/items/sh_fake_id_card.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+
+ITEM.name = "#00000's Identity Card"
+ITEM.model = Model("models/n7/props/n7_cid_card.mdl")
+ITEM.description = "A citizen identification card assigned to %s, CID #%s.\n\nCard Number: %s\nGenetic description:\n%s.\n\nThis card is property of the Combine Civil Administration. Illegal possession and identity fraud are punishable by law and will result in prosecution by Civil Protection. If found, please return this card immediately to the nearest Civil Protection team."
+ITEM.category = "Combine"
+ITEM.iconCam = {
+	pos = Vector(0, 0, 10),
+	ang = Angle(90, 90, 0),
+	fov = 45,
+}
+
+if (CLIENT) then
+	function ITEM:PaintOver(item, w, h)
+		surface.SetDrawColor(110, 255, 110, 100)
+		surface.DrawRect(w - 14, h - 14, 8, 8)
+	end
+end
+
+function ITEM:GetName()
+	return "#"  ..  self:GetData("cid", "00000")  ..  "'s Identity Card"
+end
+
+function ITEM:GetDescription()
+	return string.format(self.description,
+		self:GetData("name", "Nobody"),
+		self:GetData("cid", "00000"),
+		self:GetData("cardNumber", "00-0000-0000-00"),
+		self:GetData("geneticDesc", "N/A | N/A | N/A EYES | N/A HAIR"))
+end
+
+local prime = 9999999787 -- prime % 4 = 3! DO NOT CHANGE EVER
+local offset = 100000 -- slightly larger than sqrt(prime) is ok. DO NOT CHANGE EVER
+local block = 100000000
+local function generateCardNumber(id)
+	id = (id + offset) % prime
+
+	local cardNum = 0
+
+	for _ = 1, math.floor(id/block) do
+		cardNum = (cardNum + (id * block) % prime) % prime
+	end
+
+	cardNum = (cardNum + (id * (id % block) % prime)) % prime
+
+	if (2 * id < prime) then
+		return cardNum
+	else
+		return prime - cardNum
+	end
+end
+
+function ITEM:OnInstanced()
+	local cardNum = Schema:ZeroNumber(generateCardNumber(self:GetID()), 10)
+
+	self:SetData("cardNumber", string.utf8sub(cardNum, 1, 2) .. "-" .. string.utf8sub(cardNum, 3, 6) .. "-" .. string.utf8sub(cardNum, 7, 10) .. "-" .. Schema:ZeroNumber(cardNum % 97, 2))
+end