extends Control

@export var stage_pages: Array[Container]
@export var stage_page_scroller: ScrollContainer

const PAGE_COUNT = 5
const PAGE_WIDTH = 1080
const DRAG_TOLERANCE = 360
const SWIPE_DURATION: float = 2
const SWIPE_DELAY = 2000 # msec

var g_tween: Tween = null
var g_dragged_start: Vector2 = Vector2.ZERO
var g_scroll_start: int = 0
var g_current_page: int = 0

var g_last_scroll_updated: int = 0

var f_check_swipe: bool = false
var g_swipe_time_delta: float = 0

var g_counters: Dictionary[String, Counter] = {
        "swipe": Counter.new(),
    }


func _ready() -> void:
    pass
        

func _init() -> void:
    pass
    #page_scroller.scroll_horizontal = 3240

    
func _process(delta: float) -> void:
    var actions = _check_counters(delta)
    _do_actions(actions)
    

func _check_counters(delta: float) -> Array:
    var actions: Array = []
    for k in g_counters:
        var cnt: Counter = g_counters[k]
        if not cnt.is_active:
            continue
            
        cnt.value += delta
        if cnt.value >= cnt.sec:
            actions.append(k)
            cnt.value = 0
            cnt.is_active = false
        
    return actions

func _do_actions(actions: Array) -> void:
    for action: String in actions:
        match action:
            "swipe": 
                _swipe_to_nearest_page()

func button_pressed() -> void: 
    print(name)



func _swipe_to_nearest_page() -> void:
    if stage_page_scroller.scroll_horizontal % PAGE_WIDTH == 0: return
    
    var new_page: int = round(1.0 * stage_page_scroller.scroll_horizontal / PAGE_WIDTH)
    #print(stage_page_scroller.scroll_horizontal, " | ", 1.0 * stage_page_scroller.scroll_horizontal / PAGE_WIDTH, " | ", new_page)

    if g_tween != null:
        if g_tween.is_running():
            return

    g_tween = stage_page_scroller.get_tree().create_tween()
    g_tween.tween_property(stage_page_scroller, "scroll_horizontal", 
        new_page * PAGE_WIDTH, SWIPE_DURATION).set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)


func _input(event: InputEvent) -> void:

    if event is InputEventScreenDrag:
        stage_page_scroller.scroll_horizontal = clamp(
                stage_page_scroller.scroll_horizontal - PAGE_COUNT * event.screen_relative.x,
                0, PAGE_WIDTH * (PAGE_COUNT - 1))
        g_counters.swipe.is_active = true
        g_counters.swipe.value = 0
    elif event is InputEventPanGesture:
        g_counters.swipe.is_active = true
        g_counters.swipe.value = 0
    elif event is InputEventScreenTouch:
        pass