extends Node

var current_scene = null

var character_name = null
var character_color = null
var character_sex = null
var character_slot = null

# BG loader
var loader
var wait_frames
var time_max = 100 # msec
#var current_scene
var main_scene = null
func _ready():
        var root = get_tree().get_root()
#        current_scene = root.get_child(root.get_child_count() -1)
        current_scene = root.get_node( "Main/login_scene" )
        main_scene = root.get_node( "Main" )
        
func goto_first_scene_loading( path ):
    get_tree().get_root().get_node("Main/background_loader").show()
    loader = ResourceLoader.load_interactive( path )
    if loader == null: # check for errors
#        show_error()
        return
    set_process(true)

    wait_frames = 1 
        
func goto_scene_loading( path ):
    get_tree().get_root().get_node("Main/background_loader").show()
    loader = ResourceLoader.load_interactive( path )
    if loader == null: # check for errors
#        show_error()
        return
    set_process(true)

    current_scene.queue_free() # get rid of the old scene

    wait_frames = 1
    
func _process(time):
    if loader == null:
        # no need to process anymore
        set_process(false)
        return

    if wait_frames > 0: # wait for frames to let the "loading" animation to show up
        wait_frames -= 1
        return

    var t = OS.get_ticks_msec()
    while OS.get_ticks_msec() < t + time_max: # use "time_max" to control how much time we block this thread
        # poll your loader
        var err = loader.poll()
        update_progress()

        if err == ERR_FILE_EOF: # load finished
#            update_progress()

            var resource = loader.get_resource()
            loader = null
            set_new_scene( resource )
            break
        elif err == OK:
#            update_progress()
            pass
        else: # error during loading
            show_error()
            loader = null
            break
func update_progress():
    var progress_texture = get_tree().get_root().get_node("Main/background_loader/center_container/texture_progress")
    var progress = (float(loader.get_stage()) / loader.get_stage_count()) * progress_texture.max_value
    progress_texture.value = progress


    # or update a progress animation?
#    var len = get_node("animation").get_current_animation_length()
    # call this on a paused animation. use "true" as the second parameter to force the animation to update
#    get_node("animation").seek(progress * len, true)

    
func set_new_scene( scene_resource ):            
    var progress_texture = get_tree().get_root().get_node("Main/background_loader/center_container/texture_progress")
    progress_texture.value = 0
    get_tree().get_root().get_node("Main/background_loader").hide()
    
    current_scene = scene_resource.instance()
    main_scene.add_child(current_scene)
#    get_tree().set_current_scene( current_scene )
    
func goto_scene( path ):
    # This function will usually be called from a signal callback,
    # or some other function from the running scene.
    # Deleting the current scene at this point might be
    # a bad idea, because it may be inside of a callback or function of it.
    # The worst case will be a crash or unexpected behavior.

    # The way around this is deferring the load to a later time, when
    # it is ensured that no code from the current scene is running:

    call_deferred("_deferred_goto_scene", path)


func _deferred_goto_scene( path ):
    # Immediately free the current scene,
    # there is no risk here.
    current_scene.free()

    # Load new scene.
    var s = ResourceLoader.load( path )

    # Instance the new scene.
    current_scene = s.instance()

    # Add it to the active scene, as child of root.
    path.add_child( current_scene )

    # Optional, to make it compatible with the SceneTree.change_scene() API.
    get_tree().set_current_scene( current_scene )