-- IndustrialTest
-- Copyright (C) 2023 mrkubax10

-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.

-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.

-- You should have received a copy of the GNU General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

industrialtest.api={}

industrialtest.api.addPowerStorage=function(meta,capacity,flow,ioConfig)
	meta:set_int("industrialtest.powerCapacity",capacity)
	meta:set_int("industrialtest.powerFlow",flow)
	meta:set_int("industrialtest.powerAmount",0)
	meta:set_string("industrialtest.ioConfig",ioConfig)
end
industrialtest.api.hasPowerStorage=function(meta)
	local values={"industrialtest.powerCapacity","industrialtest.powerFlow","industrialtest.powerAmount","industrialtest.ioConfig"}
	for _,value in ipairs(values) do
		if not meta:contains(value) then
			return false
		end
	end
	return true
end
industrialtest.api.isFullyCharged=function(meta)
	return meta:get_int("industrialtest.powerAmount")>=meta:get_int("industrialtest.powerCapacity")
end
industrialtest.api.addPower=function(meta,amount)
	local powerAmount=meta:get_int("industrialtest.powerAmount")
	local powerCapacity=meta:get_int("industrialtest.powerCapacity")
	if powerAmount+amount>powerCapacity then
		local addedAmount=powerCapacity-powerAmount
		meta:set_int("industrialtest.powerAmount",powerCapacity)
		return addedAmount
	end
	meta:set_int("industrialtest.powerAmount",powerAmount+amount)
	return amount
end
industrialtest.api.addPowerToItem=function(itemstack,amount)
	local meta=itemstack:get_meta()
	if not industrialtest.api.hasPowerStorage(meta) then
		return 0
	end
	local added=industrialtest.api.addPower(meta,amount)
	itemstack:set_wear(65535-meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*65535)
	return added
end
industrialtest.api.transferPower=function(srcMeta,destMeta,amount)
	local currentFlow=math.min(srcMeta:get_int("industrialtest.powerAmount"),amount)
	if currentFlow==0 then
		return 0
	end
	local actualFlow=industrialtest.api.addPower(destMeta,currentFlow)
	srcMeta:set_int("industrialtest.powerAmount",srcMeta:get_int("industrialtest.powerAmount")-actualFlow)
	return actualFlow
end
industrialtest.api.transferPowerToItem=function(srcMeta,itemstack,amount)
	local currentFlow=math.min(srcMeta:get_int("industrialtest.powerAmount"),amount)
	if currentFlow==0 then
		return 0
	end
	local actualFlow=industrialtest.api.addPowerToItem(itemstack,currentFlow)
	srcMeta:set_int("industrialtest.powerAmount",srcMeta:get_int("industrialtest.powerAmount")-actualFlow)
	return actualFlow
end
industrialtest.api.powerFlow=function(pos)
	local meta=minetest.get_meta(pos)
	if not industrialtest.api.hasPowerStorage(meta) then
		return
	end
	local neighbourPositions={
		vector.offset(pos,-1,0,0),
		vector.offset(pos,1,0,0),
		vector.offset(pos,0,-1,0),
		vector.offset(pos,0,1,0),
		vector.offset(pos,0,0,-1),
		vector.offset(pos,0,0,1)
	}
	local neighbours={}
	for key,value in ipairs(neighbourPositions) do
		neighbours[key]=minetest.get_meta(value)
	end
	local neighboursContainingPower=0
	for key,value in ipairs(neighbours) do
		if industrialtest.api.hasPowerStorage(value) and value:get_string("industrialtest.ioConfig")[key%2==0 and key+1 or key-1]=="i" then
			neighboursContainingPower=neighboursContainingPower+1
		else
			neighbourPositions[key]=nil
			neighbours[key]=nil
		end
	end
	if neighboursContainingPower==0 then
		return
	end
	local powerFlow=meta:get_int("industrialtest.powerFlow")
	local powerDistribution=math.floor(powerFlow/neighboursContainingPower)
	-- TODO: if supplying machine power flow is too large for receiving machine to handle then that machine should explode
	for _,value in ipairs(neighbours) do
		industrialtest.api.transferPower(meta,value,powerDistribution)
	end
end