local reg_node = ocutil.safe_register_node

-- ===================================================================

if true then
    local str = minetest.setting_get ("placecraft_drawtype")
    if ocutil.str_nonempty (str) then
        if str == "mobs"    then str = "mob"    end
        if str == "sprites" then str = "sprite" end
        placecraft.drawtype = str
    end
end

-- ===================================================================

placecraft.panic = function (s)
    ocutil.panic ("placecraft: " .. s)
end

-- ===================================================================

local null_use = function (itemstack, player, pointed_thing)
    return itemstack
end

-- ===================================================================

local make_use = function (ent_name, on_use)
    if on_use == nil then on_use = null_use end

    local ent_rec =  minetest.registered_entities [ent_name]
    if    ent_rec == nil then
        placecraft.panic ("make_use: " .. ent_name)
    end

    return function (itemstack, player, pointed_thing)
        local pos = pointed_thing.under
        if  pos ~= nil then
            pos.y = pos.y + 1
            local obj = minetest.get_node (pos)

            if obj.name == "air" then
                local vs = ent_rec.visual_size
                if vs ~= nil then
                    local sz = vs.y or 1
                    if     sz >= 0.25 and sz < 1.00 then
                        pos.y = pos.y - ((1 - sz) / 2)
                    elseif sz > 1.00 and sz <= 3.00 then
                        pos.y = pos.y + ((sz - 1) / 2)
                    end
                end

                minetest.add_entity (pos, ent_name)
                itemstack:take_item()
                return itemstack
            end
        end

        return on_use (itemstack, player, pointed_thing)
    end
end

-- ===================================================================

placecraft.register_item = function (item_name, obj_params)

-- ===================================================================

    if type (item_name ) ~= "string" then
        placecraft.panic ("584844")
    end

    if type (obj_params) ~= "table"  then
        placecraft.panic ("584845")
    end

-- ===================================================================

    local basename = item_name:gsub (":", "_")
    local drawtype = obj_params.drawtype
    local groups   = obj_params.groups
    local image    = obj_params.image
    local vsize    = obj_params.vsize
    local narrow   = obj_params.narrow

-- ===================================================================

    if drawtype  == nil then
       drawtype  =  placecraft.drawtype end

    if drawtype  == "mobs"    then drawtype = "mob"    end
    if drawtype  == "sprites" then drawtype = "sprite" end

    local sprite_prefix = "pcsprites:"
    if drawtype  == "mob" then
          sprite_prefix = "pcmobs:"
    end

-- ===================================================================

    local inv_image    = obj_params.inv    or
                         obj_params.inventory_image

    local sprite_image = obj_params.sprite or
                         obj_params.sprite_image

    local wield_image  = obj_params.wield  or
                         obj_params.wield_image

-- ===================================================================

    if ocutil.str_empty (inv_image    ) then inv_image    = nil end
    if ocutil.str_empty (wield_image  ) then wield_image  = nil end
    if ocutil.str_empty (sprite_image ) then sprite_image = nil end

-- ===================================================================

    if inv_image    == nil then inv_image    = image end
    if wield_image  == nil then wield_image  = image end
    if sprite_image == nil then sprite_image = image end

-- ===================================================================

    obj_params.inventory_image = inv_image
    obj_params.wield_image     = wield_image

-- ===================================================================

    local sprite_name

    if  drawtype == "mob"    or
        drawtype == "sprite" then

        sprite_name = sprite_prefix .. basename

        placecraft.register_mob    (basename,
            sprite_image, vsize, narrow)

        placecraft.register_sprite (basename,
            sprite_image, vsize, narrow)
    else
        local prefixes = { "pcmobs", "pcsprites" }

        for _, prefix in ipairs (prefixes) do
            local entity_name = prefix .. ":" .. basename

            minetest.register_entity (":" .. entity_name, {
                on_activate = function (self)
                    self.object:remove()
                end
            })
        end
    end

-- ===================================================================

    if drawtype == "plantlike" then

        if groups  == nil then
            groups =  {}
        else
            groups = ocutil.clone_table (groups)
        end

        groups ['choppy'        ] = 2
        groups ['dig_immediate' ] = 3

        obj_params.drawtype            = "plantlike"
        obj_params.groups              = groups
        obj_params.tiles               = { image }
        obj_params.inventory_image     = inventory_image
        obj_params.wield_image         = wield_image
        obj_params.paramtype           = "light"
        obj_params.sunlight_propagates = true
        obj_params.visual_scale        = vsize
        obj_params.walkable            = false

        local sprite_collision = { -0.50 , -0.50 , -0.50 ,
                                    0.50 ,  0.50 ,  0.50 }

        local cbox = sprite_collision
        local hsize = 1

        if vsize  == nil then vsize  = 1  end
        if narrow == nil then narrow = "" end

        if ocutil.str_true (narrow) then
            hsize = 0.60
        elseif ocutil.starts_with (narrow, "0.") then
            hsize = narrow
        end

        if vsize ~= 1 or hsize ~= 1 then
            cbox = ocutil.clone_table (sprite_collision)
            for ii=1,#cbox do
                cbox [ii] = cbox [ii] * vsize

                if ii ~= 2 and ii ~= 5 then
                    cbox [ii] = cbox [ii] * hsize
                end
            end
        end

        obj_params.selection_box = {
            type  = "fixed" ,
            fixed = cbox    ,
        }

        reg_node (item_name, obj_params, narrow)
    else
        obj_params.on_use = make_use (sprite_name, obj_params.on_use)
        ocutil.safe_register_item (item_name, obj_params)
    end
end

-- ===================================================================
-- End of file.