local tsf = entity.transform
local body = entity.rigidbody
local rig = entity.modeltree

inair = true
ready = false

local dropitem = ARGS.item

do -- setup visuals
    local rotation = mat4.rotate({0, 1, 0}, math.random() * 360)
    mat4.rotate(rotation, {1, 0, 0}, math.random() * 360, rotation)
    mat4.rotate(rotation, {0, 0, 1}, math.random() * 360, rotation)
    rig:set_matrix(0, rotation)
    local icon = item.icon(dropitem.id)
    if icon:find("^block%-previews%:") then
        local bid = block.index(icon:sub(16))
        if block.get_model(bid) == "X" then
            entity:set_rig("drop-item")
            body:set_size(vec3.mul(body:get_size(), {1.0, 0.3, 1.0}))
            rig:set_texture("$0", icon)
        else
            local textures = block.get_textures(bid)
            for i,t in ipairs(textures) do
                rig:set_texture("$"..tostring(i-1), "blocks:"..textures[i])
            end
        end
    else
        entity:set_rig("drop-item")
        body:set_size(vec3.mul(body:get_size(), {1.0, 0.3, 1.0}))
        rig:set_texture("$0", icon)
    end
end

function on_grounded(force)
    rig:set_matrix(0, mat4.rotate({0, 1, 0}, math.random()*360))
    inair = false
    ready = true
end

function on_fall()
    inair = true
end

function on_trigger_enter(index, oid)
    if ready and oid == 0 then
        entity:despawn()
        inventory.add(player.get_inventory(oid), dropitem.id, dropitem.count)
        audio.play_sound_2d("events/pickup", 0.5, 0.8+math.random()*0.4, "regular")
    end
end

function on_update()
    if inair then
        local dt = time.delta();
        local matrix = rig:get_matrix(0)
        mat4.rotate(matrix, {0, 1, 0}, 240*dt, matrix)
        mat4.rotate(matrix, {0, 0, 1}, 240*dt, matrix)
        rig:set_matrix(0, matrix)
    end
end