-- This file is part of the SAMP.Lua project.
-- Licensed under the MIT License.
-- Copyright (c) 2016, FYP @ BlastHack Team <blast.hk>
-- https://github.com/THE-FYP/SAMP.Lua

local ffi = require 'ffi'
local utils = {}

function utils.decompress_health_and_armor(hpAp)
	local hp = math.min(bit.rshift(hpAp, 4) * 7, 100)
	local armor = math.min(bit.band(hpAp, 0x0F) * 7, 100)
	return hp, armor
end

function utils.compress_health_and_armor(health, armor)
	local hp = health >= 100 and 0xF0 or bit.lshift(health / 7, 4)
	local ap = armor >= 100 and 0x0F or bit.band(armor / 7, 0x0F)
	return bit.bor(hp, ap)
end

function utils.create_sync_data(st)
	require 'samp.synchronization'
	return ffi.new(st)
end

function utils.read_sync_data(bs, st)
	local dataStruct = utils.create_sync_data(st)
	local ptr = tonumber(ffi.cast('intptr_t', ffi.cast('void*', dataStruct)))
	raknetBitStreamReadBuffer(bs, ptr, ffi.sizeof(dataStruct))
	return dataStruct
end

function utils.write_sync_data(bs, st, ffiobj)
	require 'samp.synchronization'
	local ptr = tonumber(ffi.cast('intptr_t', ffi.cast('void*', ffiobj)))
	raknetBitStreamWriteBuffer(bs, ptr, ffi.sizeof(st))
end

function utils.process_outcoming_sync_data(bs, st)
	local data = raknetBitStreamGetDataPtr(bs) + 1
	require 'samp.synchronization'
	return {ffi.cast(st .. '*', data)}
end

return utils