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--[[
More Blocks: circular saw

Copyright (c) 2011-2015 Calinou and contributors.
Licensed under the zlib license. See LICENSE.md for more information.
--]]

local S = moreblocks.intllib

circular_saw = {}

circular_saw.known_stairs = setmetatable({}, {
	__newindex = function(k, v)
		local modname = minetest.get_current_modname()
		print(("WARNING: mod %s tried to add node %s to the circular saw"
				.. " manually."):format(modname, v))
	end,
})

-- This is populated by stairsplus:register_all:
circular_saw.known_nodes = {}

-- How many microblocks does this shape at the output inventory cost:
-- It may cause slight loss, but no gain.
circular_saw.cost_in_microblocks = {
	1, 1, 1, 1, 1, 1, 1, 2,
	2, 3, 2, 4, 2, 4, 5, 6,
	7, 1, 1, 2, 4, 6, 7, 8,
	3, 1, 1, 2, 4, 4, 2, 6,
	7, 3, 7, 7, 4, 8, 3, 2,
	6, 2, 1, 3, 4,
}

circular_saw.names = {
	{"micro", "_1"},
	{"panel", "_1"},
	{"micro", "_2"},
	{"panel", "_2"},
	{"micro", "_4"},
	{"panel", "_4"},
	{"micro", ""},
	{"panel", ""},
	{"micro", "_12"},
	{"panel", "_12"},
	{"micro", "_14"},
	{"panel", "_14"},
	{"micro", "_15"},
	{"panel", "_15"},
	{"stair", "_outer"},
	{"stair", ""},
	{"stair", "_inner"},
	{"slab", "_1"},
	{"slab", "_2"},
	{"slab", "_quarter"},
	{"slab", ""},
	{"slab", "_three_quarter"},
	{"slab", "_14"},
	{"slab", "_15"},
	{"stair", "_half"},
	{"stair", "_alt_1"},
	{"stair", "_alt_2"},
	{"stair", "_alt_4"},
	{"stair", "_alt"},
	{"slope", ""},
	{"slope", "_half"},
	{"slope", "_half_raised"},
	{"slope", "_inner"},
	{"slope", "_inner_half"},
	{"slope", "_inner_half_raised"},
	{"slope", "_inner_cut"},
	{"slope", "_inner_cut_half"},
	{"slope", "_inner_cut_half_raised"},
	{"slope", "_outer"},
	{"slope", "_outer_half"},
	{"slope", "_outer_half_raised"},
	{"slope", "_outer_cut"},
	{"slope", "_outer_cut_half"},
	{"slope", "_outer_cut_half_raised"},
	{"slope", "_cut"},
}

function circular_saw:get_cost(inv, stackname)
	for i, item in pairs(inv:get_list("output")) do
		if item:get_name() == stackname then
			return circular_saw.cost_in_microblocks[i]
		end
	end
end

function circular_saw:get_output_inv(modname, material, amount, max)
	if (not max or max < 1 or max > 99) then max = 99 end

	local list = {}
	local pos = #list

	-- If there is nothing inside, display empty inventory:
	if amount < 1 then
		return list
	end

	for i = 1, #circular_saw.names do
		local t = circular_saw.names[i]
		local cost = circular_saw.cost_in_microblocks[i]
		local balance = math.min(math.floor(amount/cost), max)
		pos = pos + 1
		list[pos] = modname .. ":" .. t[1] .. "_" .. material .. t[2]
				.. " " .. balance
	end
	return list
end


-- Reset empty circular_saw after last full block has been taken out
-- (or the circular_saw has been placed the first time)
-- Note: max_offered is not reset:
function circular_saw:reset(pos)
	local meta = minetest.get_meta(pos)
	local inv  = meta:get_inventory()

	inv:set_list("input",  {})
	inv:set_list("micro",  {})
	inv:set_list("output", {})
	meta:set_int("anz", 0)

	meta:set_string("infotext",
			S("Circular Saw is empty (owned by %s)")
			:format(meta:get_string("owner") or ""))
end


-- Player has taken something out of the box or placed something inside
-- that amounts to count microblocks:
function circular_saw:update_inventory(pos, amount)
	local meta          = minetest.get_meta(pos)
	local inv           = meta:get_inventory()

	amount = meta:get_int("anz") + amount

	-- The material is recycled automaticly.
	inv:set_list("recycle",  {})

	if amount < 1 then -- If the last block is taken out.
		self:reset(pos)
		return
	end
 
	local stack = inv:get_stack("input",  1)
	-- At least one "normal" block is necessary to see what kind of stairs are requested.
	if stack:is_empty() then
		-- Any microblocks not taken out yet are now lost.
		-- (covers material loss in the machine)
		self:reset(pos)
		return

	end
	local node_name = stack:get_name() or ""
	local name_parts = circular_saw.known_nodes[node_name] or ""
	local modname  = name_parts[1] or ""
	local material = name_parts[2] or ""

	inv:set_list("input", { -- Display as many full blocks as possible:
		node_name.. " " .. math.floor(amount / 8)
	})

	-- The stairnodes made of default nodes use moreblocks namespace, other mods keep own:
	if modname == "default" then
		modname = "moreblocks"
	end
	-- print("circular_saw set to " .. modname .. " : "
	--	.. material .. " with " .. (amount) .. " microblocks.")

	-- 0-7 microblocks may remain left-over:
	inv:set_list("micro", {
		modname .. ":micro_" .. material .. "_bottom " .. (amount % 8)
	})
	-- Display:
	inv:set_list("output",
		self:get_output_inv(modname, material, amount,
				meta:get_int("max_offered")))
	-- Store how many microblocks are available:
	meta:set_int("anz", amount)

	meta:set_string("infotext",
			S("Circular Saw is working on %s (owned by %s)")
			:format(material, meta:get_string("owner") or ""))
end


-- The amount of items offered per shape can be configured:
function circular_saw.on_receive_fields(pos, formname, fields, sender)
	local meta = minetest.get_meta(pos)
	local max = tonumber(fields.max_offered)
	if max and max > 0 then
		meta:set_string("max_offered",  max)
		-- Update to show the correct number of items:
		circular_saw:update_inventory(pos, 0)
	end
end


-- Moving the inventory of the circular_saw around is not allowed because it
-- is a fictional inventory. Moving inventory around would be rather
-- impractical and make things more difficult to calculate:
function circular_saw.allow_metadata_inventory_move(
		pos, from_list, from_index, to_list, to_index, count, player)
	return 0
end


-- Only input- and recycle-slot are intended as input slots:
function circular_saw.allow_metadata_inventory_put(
		pos, listname, index, stack, player)
	-- The player is not allowed to put something in there:
	if listname == "output" or listname == "micro" then
		return 0
	end

	local meta = minetest.get_meta(pos)
	local inv  = meta:get_inventory()
	local stackname = stack:get_name()
	local count = stack:get_count()

	-- Only alow those items that are offered in the output inventory to be recycled:
	if listname == "recycle" then
		if not inv:contains_item("output", stackname) then
			return 0
		end
		local stackmax = stack:get_stack_max()