uranium.reactor_inactive_formspec =
    "invsize[8,9;]"..
    "image[2,2;1,1;default_furnace_fire_bg.png]"..
    "list[current_name;fuel;2,3;1,1;]"..
    "list[current_name;src;2,1;1,1;]"..
    "list[current_name;dst;5,1;2,2;]"..
    "list[current_player;main;0,5;8,4;]"

minetest.register_node("uranium:reactor", {
    description = "Reactor",
    tiles = {"default_furnace_top.png", "default_furnace_bottom.png", "default_furnace_side.png",
        "default_furnace_side.png", "default_furnace_side.png", "default_furnace_front.png"},
    paramtype2 = "facedir",
    groups = {cracky=2},
    sounds = default.node_sound_stone_defaults(),
    on_construct = function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec", uranium.reactor_inactive_formspec)
        meta:set_string("infotext", "Reactor")
        local inv = meta:get_inventory()
        inv:set_size("fuel", 1)
        inv:set_size("src", 1)
        inv:set_size("dst", 4)
    end,
    can_dig = function(pos,player)
        local meta = minetest.env:get_meta(pos);
        local inv = meta:get_inventory()
        if not inv:is_empty("fuel") then
            return false
        elseif not inv:is_empty("dst") then
            return false
        elseif not inv:is_empty("src") then
            return false
        end
        return true
    end,
})

minetest.register_node("uranium:reactor_active", {
    description = "Reactor",
    tiles = {"default_furnace_top.png", "default_furnace_bottom.png", "default_furnace_side.png",
        "default_furnace_side.png", "default_furnace_side.png", "default_furnace_front_active.png"},
    paramtype2 = "facedir",
    light_source = 8,
    drop = "uranium:reactor",
    groups = {cracky=2},
    sounds = default.node_sound_stone_defaults(),
    on_construct = function(pos)
        local meta = minetest.env:get_meta(pos)
        meta:set_string("formspec", uranium.reactor_inactive_formspec)
        meta:set_string("infotext", "Furnace");
        local inv = meta:get_inventory()
        inv:set_size("fuel", 1)
        inv:set_size("src", 1)
        inv:set_size("dst", 4)
    end,
    can_dig = function(pos,player)
        local meta = minetest.env:get_meta(pos);
        local inv = meta:get_inventory()
        if not inv:is_empty("fuel") then
            return false
        elseif not inv:is_empty("dst") then
            return false
        elseif not inv:is_empty("src") then
            return false
        end
        return true
    end,
})

function hacky_swap_node(pos,name)
    local node = minetest.env:get_node(pos)
    local meta = minetest.env:get_meta(pos)
    local meta0 = meta:to_table()
    if node.name == name then
        return
    end
    node.name = name
    local meta0 = meta:to_table()
    minetest.env:set_node(pos,node)
    meta = minetest.env:get_meta(pos)
    meta:from_table(meta0)
end

minetest.register_abm({
    nodenames = {"uranium:reactor","uranium:reactor_active"},
    interval = 1.0,
    chance = 1,
    action = function(pos, node, active_object_count, active_object_count_wider)
        local meta = minetest.env:get_meta(pos)
        for i, name in ipairs({
                "fuel_totaltime",
                "fuel_time",
                "src_totaltime",
                "src_time"
        }) do
            if meta:get_string(name) == "" then
                meta:set_float(name, 0.0)
            end
        end

        local inv = meta:get_inventory()

        local srclist = inv:get_list("src")
        local cooked = nil

        if srclist then
            cooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
        end

        local was_active = false

        if meta:get_float("fuel_time") < meta:get_float("fuel_totaltime") then
            was_active = true
            meta:set_float("fuel_time", meta:get_float("fuel_time") + 1)
            meta:set_float("src_time", meta:get_float("src_time") + 1)
            if cooked and cooked.item and meta:get_float("src_time") >= cooked.time then
                -- check if there's room for output in "dst" list
                if inv:room_for_item("dst",cooked.item) then
                    -- Put result in "dst" list
                    inv:add_item("dst", cooked.item)
                    -- take stuff from "src" list
                    srcstack = inv:get_stack("src", 1)
                    srcstack:take_item()
                    inv:set_stack("src", 1, srcstack)
                else
                    print("Could not insert '"..cooked.item.."'")
                end
                meta:set_string("src_time", 0)
            end
        end

        if meta:get_float("fuel_time") < meta:get_float("fuel_totaltime") then
            local percent = math.floor(meta:get_float("fuel_time") /
                    meta:get_float("fuel_totaltime") * 100)
            meta:set_string("infotext","Reactor active: "..percent.."%")
            hacky_swap_node(pos,"uranium:reactor_active")
            meta:set_string("formspec",
                "invsize[8,9;]"..
                "image[2,2;1,1;default_furnace_fire_bg.png^[lowpart:"..
                        (100-percent)..":default_furnace_fire_fg.png]"..
                "list[current_name;fuel;2,3;1,1;]"..
                "list[current_name;src;2,1;1,1;]"..
                "list[current_name;dst;5,1;2,2;]"..
                "list[current_player;main;0,5;8,4;]")
            return
        end

        local fuel = nil
        local cooked = nil
        local fuellist = inv:get_list("fuel")
        local srclist = inv:get_list("src")

        if srclist then
            cooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
        end
        if fuellist then
            fuel = minetest.get_craft_result({method = "fuel", width = 1, items = fuellist})
        end

        if fuel.time <= 0 then
            meta:set_string("infotext","Reactor out of fuel")
            hacky_swap_node(pos,"uranium:reactor")
            meta:set_string("formspec", uranium.reactor_inactive_formspec)
            return
        end

        if cooked.item:is_empty() then
            if was_active then
                meta:set_string("infotext","Reactor is empty")
                hacky_swap_node(pos,"uranium:reactor")
                meta:set_string("formspec", uranium.reactor_inactive_formspec)
            end
            return
        end

        meta:set_string("fuel_totaltime", fuel.time)
        meta:set_string("fuel_time", 0)

        local stack = inv:get_stack("fuel", 1)
        stack:take_item()
        inv:set_stack("fuel", 1, stack)
    end,
})