-- Detect optional mods.
local technic_path = minetest.get_modpath("technic")
local chains_path = minetest.get_modpath("chains")
local mineclone_path = core.get_modpath("mcl_core") and mcl_core
local aurum_path = core.get_modpath("aurum") and aurum
local basic_materials_path = core.get_modpath("basic_materials")

if mineclone_path then
   minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"mcl_core:iron_ingot", "mcl_core:paper", "mcl_core:iron_ingot"},
            {"mcl_core:iron_ingot", "mcl_core:gold_ingot", "mcl_core:iron_ingot"},
            {"mcl_core:clay_lump", "group:glass", "mcl_core:clay_lump"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"mcl_core:iron_ingot", "group:wood"},
            {"group:wood", "mcl_core:iron_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"mcl_core:gold_ingot", "mcl_core:iron_ingot", "mcl_core:gold_ingot"},
            {"mcl_core:ironblock", "mcl_furnaces:furnace", "mcl_core:ironblock"},
            {"mcl_core:paper", "mcl_core:gold_ingot", "mcl_core:paper"}
        },
    })
elseif aurum_path then
    minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"aurum_ore:iron_ingot", "group:glass", "aurum_ore:iron_ingot"},
            {"aurum_ore:iron_ingot", "aurum_ore:mana_bean", "aurum_ore:iron_ingot"},
            {"aurum_ore:iron_ingot", "group:glass", "aurum_ore:iron_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"group:glass", "aurum_ore:iron_ingot"},
            {"group:wood", "group:glass"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"aurum_ore:gold_ingot", "aurum_ore:iron_ingot", "aurum_ore:gold_ingot"},
            {"aurum_ore:iron_block", "aurum_cook:oven", "aurum_ore:iron_block"},
            {"aurum_ore:gold_ingot", "aurum_ore:mana_bean", "aurum_ore:gold_ingot"}
        },
    })
elseif technic_path and chains_path then
    minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"technic:cast_iron_ingot", "chains:chain", "technic:cast_iron_ingot"},
            {"technic:cast_iron_ingot", "default:mese_crystal", "technic:cast_iron_ingot"},
            {"technic:stainless_steel_ingot", "default:glass", "technic:stainless_steel_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"technic:cast_iron_ingot", "default:glass"},
            {"default:glass", "glooptest:chainlink"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"default:diamond", "technic:control_logic_unit", "default:diamond"},
            {"default:steelblock", "technic:motor", "default:steelblock"},
            {"chains:chain", "default:diamond", "chains:chain"}
        },
    })
elseif technic_path and basic_materials_path then
    minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"technic:cast_iron_ingot", "basic_materials:chain_steel", "technic:cast_iron_ingot"},
            {"technic:cast_iron_ingot", "default:mese_crystal", "technic:cast_iron_ingot"},
            {"technic:stainless_steel_ingot", "default:glass", "technic:stainless_steel_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"technic:cast_iron_ingot", "default:glass"},
            {"default:glass", "basic_materials:chain_steel"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"default:diamond", "technic:control_logic_unit", "default:diamond"},
            {"default:steelblock", "technic:motor", "default:steelblock"},
            {"basic_materials:chain_steel", "default:diamond", "basic_materials:chain_steel"}
        },
    })
elseif technic_path and farming and farming.mod and ( farming.mod == "redo" or farming.mod == "undo" ) then
    -- add alternative recipe with hemp rope
    minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"technic:cast_iron_ingot", "farming:hemp_rope", "technic:cast_iron_ingot"},
            {"technic:cast_iron_ingot", "default:mese_crystal", "technic:cast_iron_ingot"},
            {"technic:stainless_steel_ingot", "default:glass", "technic:stainless_steel_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"technic:cast_iron_ingot", "default:glass"},
            {"default:glass", "farming:hemp_rope"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"default:diamond", "technic:control_logic_unit", "default:diamond"},
            {"default:steelblock", "technic:motor", "default:steelblock"},
            {"farming:hemp_rope", "default:diamond", "farming:hemp_rope"}
        },
    })

-- Recipes without technic & chains required.
-- Recipes for default dependency fallback.
else
    minetest.register_craft({
        output = "elevator:elevator_off",
        recipe = {
            {"default:steel_ingot", "farming:cotton", "default:steel_ingot"},
            {"default:steel_ingot", "default:mese_crystal", "default:steel_ingot"},
            {"xpanes:pane_flat", "default:glass", "xpanes:pane_flat"},
        },
    })

    minetest.register_craft({
        output = "elevator:shaft",
        recipe = {
            {"default:steel_ingot", "default:obsidian_glass"},
            {"default:obsidian_glass", "default:steel_ingot"},
        },
    })

    minetest.register_craft({
        output = "elevator:motor",
        recipe = {
            {"default:diamond", "default:copper_ingot", "default:diamond"},
            {"default:steelblock", "default:furnace", "default:steelblock"},
            {"farming:cotton", "default:diamond", "farming:cotton"}
        },
    })
end