-- 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/>.

local S=minetest.get_translator("industrialtest")

industrialtest.api={}
industrialtest.api.maceratorRecipes={}
industrialtest.api.compressorRecipes={}
industrialtest.api.extractorRecipes={}
industrialtest.api.geothermalGeneratorFuels={}

industrialtest.api.lvPowerFlow=600
industrialtest.api.mvPowerFlow=2400
industrialtest.api.hvPowerFlow=10200
industrialtest.api.evPowerFlow=40800
industrialtest.api.ivPowerFlow=163800

industrialtest.internal={}
industrialtest.internal.clamp=function(num,min,max)
	return math.max(math.min(num,max),min)
end

-- \brief Adds power storage to metadata
-- \param capacity How much EU item/node can store
-- \param flow How much EU can flow in or out item/node per industrialtest.updateDelay
-- \param ioConfig Input/Output configuration in following side order: -X, +X, -Y, +Y, -Z, +Z
--                 a - bidirectional, i - input, o - output
-- \returns nil
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
-- \brief Takes rotated node and side and outputs normalized side that can be used for ioConfig lookups
-- \param pos Vector with node position
-- \param side Node side. See industrialtest.api.addPowerStorage for possible values
-- \returns Normalized side or in case of failure side argument back
industrialtest.api.normalizeSide=function(pos,side)
	local node=minetest.get_node(pos)
	-- FIXME: improve code quality there
	local translation={
		[0]={
			1,2,3,4,5,6
		},
		[1]={
			5,6,3,4,2,1
		},
		[2]={
			1,2,3,4,6,5
		},
		[3]={
			6,5,3,4,1,2
		}
	}
	if node.param2>3 then
		return side
	end
	return translation[node.param2][side]
end
-- \brief Checks if metadata contains power storage
-- \param meta MetaDataRef which should be checked
-- \returns true if metadata contains power storage, false otherwise
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
-- \brief Updates itemstack description to show current power storage information, additionally updates item wear bar.
--        Function doesn't check if itemstack contains power storage so you should be sure that it does before calling this function
-- \param itemstack ItemStack which should be updated
-- \returns nil
industrialtest.api.updateItemPowerText=function(itemstack)
	local meta=itemstack:get_meta()
	local def=minetest.registered_tools[itemstack:get_name()]
	meta:set_string("description",S("@1\n@2 / @3 EU",def.description,meta:get_int("industrialtest.powerAmount"),meta:get_int("industrialtest.powerCapacity")))
	itemstack:set_wear(65535-meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*65534)
end
-- \brief Adds power storage to item depending on it's definition
-- \param itemstack ItemStack to which item storage should be added
-- \returns true if power storage was successfully added, false otherwise
industrialtest.api.preparePowerStorageItem=function(itemstack)
	local meta=itemstack:get_meta()
	local def=minetest.registered_tools[itemstack:get_name()]
	if industrialtest.api.hasPowerStorage(meta) or not def or not def._industrialtest_powerStorage or not def._industrialtest_powerCapacity or not def._industrialtest_powerFlow then
		return false
	end
	industrialtest.api.addPowerStorage(meta,def._industrialtest_powerCapacity,def._industrialtest_powerFlow,"n/a")
	industrialtest.api.updateItemPowerText(itemstack)
	return true
end
-- \brief Sets uses metadata value depending on item's definition
-- \param itemstack ItemStack which should be altered
-- \returns true if value was successfully added, false otherwise
industrialtest.api.prepareToolItem=function(itemstack)
	local def=minetest.registered_tools[itemstack:get_name()]
	if not def or not def._industrialtest_tool or not def.tool_capabilities or not def.tool_capabilities.uses then
		return false
	end
	local meta=itemstack:get_meta()
	meta:set_int("industrialtest.uses",def.tool_capabilities.uses)
	return true
end
-- \brief Adds wear to item after it's use
-- \param itemstack ItemStack to which wear should be added
-- \returns nil
industrialtest.api.afterToolUse=function(itemstack)
	local meta=itemstack:get_meta()
	local def=minetest.registered_tools[itemstack:get_name()]
	if not def or not def._industrialtest_tool or not def.tool_capabilities or not def.tool_capabilities.uses then
		return
	end
	if not meta:contains("industrialtest.uses") then
		industrialtest.prepareToolItem(itemstack)
	end
	local uses=meta:get_int("industrialtest.uses")-1
	if uses==0 then
		itemstack:set_count(0)
		minetest.sound_play({name="default_tool_breaks"},{
			gain=1,
			fade=0,
			pitch=1
		},true)
		return
	end
	meta:set_int("industrialtest.uses",uses)
	itemstack:set_wear(65535-uses/def.tool_capabilities.uses*65535)
end
-- \brief Checks if power storage is fully charged
-- \param meta MetaDataRef which should be checked
-- \returns true if power storage is fully charged, false otherwise
industrialtest.api.isFullyCharged=function(meta)
	return meta:get_int("industrialtest.powerAmount")>=meta:get_int("industrialtest.powerCapacity")
end
-- \brief Adds power to power storage. Function doesn't check if meta contains power storage so you must be sure that it does.
-- \param meta MetaDataRef to which power should be added
-- \param amount Amount of power to add
-- \returns How much of power was actually added
industrialtest.api.addPower=function(meta,amount)
	local powerAmount=meta:get_int("industrialtest.powerAmount")
	local powerCapacity=meta:get_int("industrialtest.powerCapacity")
	local prevPowerAmount=powerAmount
	powerAmount=industrialtest.internal.clamp(powerAmount+amount,0,powerCapacity)
	meta:set_int("industrialtest.powerAmount",powerAmount)
	return powerAmount-prevPowerAmount
end
-- \brief Adds power to itemstack. Function checks if itemstack has power storage.
-- \param itemstack ItemStack to which add power
-- \param amount How much power to add
-- \returns Amount of power added
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)
	industrialtest.api.updateItemPowerText(itemstack)
	return added
end
-- \brief Adds power to destination metadata while subtracting it from source metadata
-- \Param srcMeta MetaDataRef from which take power
-- \param destMeta MetaDataRef to which add power
-- \returns How much of power was actually transferred
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
-- \brief Adds power to destination itemstack while subtracting it from source metadata
-- \param srcMeta MetaDataRef from which take power
-- \param itemstack ItemStack to which add power
-- \returns How much of power was actually transferred
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
-- \brief Transfers power from source node to all neighbouring nodes
-- \param pos Vector with position of source node
-- \returns two values: true if any neighbouring node has room for more power, false otherwise
--                      true if any power was transferred, false otherwise
industrialtest.api.powerFlow=function(pos)
	local meta=minetest.get_meta(pos)
	if not industrialtest.api.hasPowerStorage(meta) then
		return false
	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
		local side=industrialtest.api.getOppositeSide(key)
		if industrialtest.api.hasPowerStorage(value) and industrialtest.api.isPowerInput(value,side) and not industrialtest.api.isFullyCharged(value) then
			neighboursContainingPower=neighboursContainingPower+1
		else
			neighbourPositions[key]=0
			neighbours[key]=0
		end
	end
	if neighboursContainingPower==0 then
		return false
	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
	local roomAvailable=false
	local transferred=false
	for key,value in ipairs(neighbours) do
		if industrialtest.api.isPowerOutput(meta,key) and value~=0 then
			if industrialtest.api.transferPower(meta,value,powerDistribution)>0 then
				transferred=true
			end
			local def=minetest.registered_nodes[minetest.get_node(neighbourPositions[key]).name]
			if def then
				local updateFormspec=def._industrialtest_updateFormspec
				if updateFormspec then
					updateFormspec(value)
				end
				local onPowerFlow=def._industrialtest_onPowerFlow
				if onPowerFlow and transferred then
					onPowerFlow(neighbourPositions[key],industrialtest.api.getOppositeSide(key))
				end
			end
			minetest.get_node_timer(neighbourPositions[key]):start(industrialtest.updateDelay)
			if not industrialtest.api.isFullyCharged(value) then
				roomAvailable=true
			end
		end
	end
	return roomAvailable,transferred
end
-- \brief Starts node timer of neighbouring nodes with center node
-- \param pos Vector with position of center node
-- \returns nil
industrialtest.api.triggerNeighbours=function(pos)
	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)
	}
	for key,value in ipairs(neighbourPositions) do
		local meta=minetest.get_meta(value)
		local side=industrialtest.api.getOppositeSide(key)
		if industrialtest.api.hasPowerStorage(meta) and industrialtest.api.isPowerOutput(meta,side) then
			minetest.get_node_timer(value):start(industrialtest.updateDelay)
		end
	end
end
-- \brief Returns opposite side of provided one
-- \param side Side number. See industrialtest.api.addPowerStorage for order
-- \returns Opposite side
industrialtest.api.getOppositeSide=function(side)
	return (side%2==0 and side-1 or side+1)
end
-- \brief Returns connections of node with power storage
-- \param pos Vector with position of node with power storage
-- \returns Table with side numbers
industrialtest.api.getConnections=function(pos)
	local result={}
	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 index=1
	for key,value in ipairs(neighbourPositions) do
		local meta=minetest.get_meta(value)
		if industrialtest.api.hasPowerStorage(meta) then
			result[index]=key
			index=index+1
		end
	end
	return result
end
-- \brief Changes node's power IO config. Function doesn't check if meta actually contains power storage.
-- \param meta MetaDataRef of node which power IO config should be changed
-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
-- \param mode Side mode. See industrialtest.api.addPowerStorage for possible values.
-- \returns nil
industrialtest.api.changeIoConfig=function(meta,side,mode)
	local ioConfig=meta:get_string("industrialtest.ioConfig")
	ioConfig=string.sub(ioConfig,1,side-1)..mode..string.sub(ioConfig,side+1)
	meta:set_string("industrialtest.ioConfig",ioConfig)
end
-- \brief Checks if provided side is power input
-- \param meta MetaDataRef of node
-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
-- \returns true if provided side is power input, false otherwise
industrialtest.api.isPowerInput=function(meta,side)
	local ioConfig=meta:get_string("industrialtest.ioConfig")
	local mode=string.sub(ioConfig,side,side)
	return (mode=="i" or mode=="a")
end
-- \brief Checks if provided side is power output
-- \param meta MetaDataRef of node
-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
-- \returns true if provided side is power output, false otherwise
industrialtest.api.isPowerOutput=function(meta,side)
	local ioConfig=meta:get_string("industrialtest.ioConfig")
	local mode=string.sub(ioConfig,side,side)
	return (mode=="o" or mode=="a")
end
-- \brief Registers dust of certain resource
-- \param name Technical name of resource
-- \param displayName Display name of resource
-- \param resources List of tables with following keys: <output>, <recipe>, [count(1)]
--                                                      <> - required, [] - optional, () - default value
-- \param color HTML color of dust
-- \param registerMaceratorRecipe If true macerator recipe for dust will be registered
-- \returns nil
industrialtest.api.registerResourceDust=function(name,displayName,resources,color,registerMaceratorRecipe)
	minetest.register_craftitem("industrialtest:"..name.."_dust",{
		description=S(displayName.." Dust"),
		inventory_image="industrialtest_dust.png",
		color=color
	})
	if registerMaceratorRecipe then
		for _,value in ipairs(resources) do
			industrialtest.api.registerMaceratorRecipe({
				output="industrialtest:"..name.."_dust "..(value.count or 1),
				recipe=value.resource
			})
		end
	end
end
-- \brief Registers macerator recipe
-- \param config Table with keys: <output>, <recipe>, [time(2)]
-- \returns nil
industrialtest.api.registerMaceratorRecipe=function(config)
	local definition={
		output=config.output or "",
		recipe=config.recipe or "",
		time=config.time or 2
	}
	industrialtest.api.maceratorRecipes[definition.recipe]=definition
end
-- \brief Returns macerator recipe result
-- \param recipe String ID of resulting conten
-- \returns Table with following keys: output, recipe, time
industrialtest.api.getMaceratorRecipeResult=function(recipe)
	return industrialtest.api.maceratorRecipes[recipe]
end
-- \brief Registers compressor recipe
-- \param config Table with following keys: <output>, <recipe>, [time(2)], [count(1)]
-- \returns nil
industrialtest.api.registerCompressorRecipe=function(config)
	local definition={
		output=config.output or "",
		recipe=config.recipe or "",
		time=config.time or 2,
		count=config.count or 1
	}
	industrialtest.api.compressorRecipes[definition.recipe]=definition
end
-- \brief Returns macerator recipe result
-- \param recipe String ID of resulting conten
-- \returns Table with following keys: output, recipe, time
industrialtest.api.getCompressorRecipeResult=function(recipe)
	return industrialtest.api.compressorRecipes[recipe]
end
industrialtest.api.registerExtractorRecipe=function(config)
	local definition={
		output=config.output or "",
		recipe=config.recipe or "",
		time=config.time or 2
	}
	industrialtest.api.extractorRecipes[definition.recipe]=definition
end
industrialtest.api.getExtractorRecipeResult=function(recipe)
	return industrialtest.api.extractorRecipes[recipe]
end
-- \brief Registers fuel that can be used in geothermal generator
-- \param fuel Table with following keys: <name>, <calorificValue>, <storageItems>
--        which is a table containing items which are tables with following keys: <name>, <leftover>
-- \returns nil
industrialtest.api.registerGeothermalGeneratorFuel=function(config)
	local definition={
		name=config.name or "",
		calorificValue=config.calorificValue or 0,
		texture=config.texture or "industrialtest_gui_fluid_bg.png",
		storageItems=config.storageItems or {}
	}
	industrialtest.api.geothermalGeneratorFuels[definition.name]=definition
end
-- \brief Returns generator fuel information
-- \param name Name of fuel
-- \returns Table with following keys: name, calorificValue, storageItems
industrialtest.api.getGeothermalGeneratorFuel=function(name)
	return industrialtest.api.geothermalGeneratorFuels[name]
end
-- \brief Returns generator fuel information by item name
-- \param name ID of item
-- \returns Table with following keys: name, calorificValue, storageItems or nil in case of failure
industrialtest.api.getGeothermalGeneratorFuelByItem=function(name)
	for _,value in pairs(industrialtest.api.geothermalGeneratorFuels) do
		for _,item in ipairs(value.storageItems) do
			if item.name==name then
				return value
			end
		end
	end
	return nil
end