-- theese allow_metadata_* functions were taken from the mtg furnace
local function allow_metadata_inventory_put(pos, listname, index, stack, player)
    if listname == 'dst' then return 0 end
    return stack:get_count()
end

local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
    if to_list == 'dst' then return 0 end
    return count
end

sbz_api.register_stateful_machine('sbz_chem:high_power_electric_furnace', {
    description = 'High Power Electric Furnace',
    info_extra = 'Consumes 30 power.',
    tiles = {
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        'hpef_front_off.png',
    },
    groups = { matter = 1 },
    paramtype2 = '4dir',
    allow_metadata_inventory_move = allow_metadata_inventory_move,
    allow_metadata_inventory_put = allow_metadata_inventory_put,

    input_inv = 'src',
    output_inv = 'dst',
    on_construct = function(pos)
        local meta = minetest.get_meta(pos)
        local inv = meta:get_inventory()
        inv:set_size('src', 4)
        inv:set_size('dst', 4)

        meta:set_string(
            'formspec',
            [[
formspec_version[7]
size[8.2,9]
style_type[list;spacing=.2;size=.8]
list[current_player;main;0.2,5;8,4;]
list[context;src;1.5,1;2,2;]
listring[]
list[context;dst;4.5,1;2,2;]
listring[current_player;main]
listring[context;dst]
    ]]
        )
    end,
    after_place_node = pipeworks.after_place,
    autostate = true,
    action = function(pos, _, meta, supply, demand)
        local power_needed = 30
        local inv = meta:get_inventory()

        if demand + power_needed > supply then
            meta:set_string('infotext', 'Not enough power')
            return 0, false -- Don't add to the demand this time
        else
            meta:set_string('infotext', 'Smelting...')

            local src = inv:get_list 'src'

            local out, decremented_input, index
            for i = 1, 4 do
                local out_inner, decremented_input_inner = minetest.get_craft_result {
                    method = 'cooking',
                    width = 1,
                    items = { src[i] },
                }
                if not out_inner.item:is_empty() then
                    out, decremented_input = out_inner, decremented_input_inner
                    index = i
                    break
                end
            end
            if out == nil then
                meta:set_string('infotext', 'Invalid/no recipe')
                return 0
            end

            if not inv:room_for_item('dst', out.item) then
                meta:set_string('infotext', 'Full')
                return 0
            end

            inv:set_stack('src', index, decremented_input.items[1])
            inv:add_item('dst', out.item)
            sbz_api.play_sfx({ name = 'simple_alloy_furnace_running', gain = 0.6 }, { pos = pos })
            return power_needed
        end
    end,
}, {
    tiles = {
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        'hpef_top.png',
        { name = 'hpef_front.png', animation = { type = 'vertical_frames', length = 0.7 } },
    },
    light_source = 10,
})

minetest.register_craft {
    output = 'sbz_chem:high_power_electric_furnace',
    recipe = {
        { 'sbz_power:simple_charged_field', 'sbz_resources:matter_dust', 'sbz_power:simple_charged_field' },
        { 'sbz_resources:matter_blob', 'sbz_resources:emittrium_circuit', 'sbz_resources:matter_blob' },
        { 'sbz_power:simple_charged_field', 'sbz_chem:tin_powder', 'sbz_power:simple_charged_field' },
    },
}
