extends PanelContainer

var area_dict = {}
@onready var dropzone = $HBoxContainer/dropzone

var currently_selected_node: Area2D = null
var is_area_dragged: bool = false
var currently_dragged_area: Area2D

# Called when the node enters the scene tree for the first time.
func _ready():
    
    # TODO: Currently populating the dictionary with the Nodes currently in the scene
    # When opening the scene we need to pass some kind of collection to the Board
    # Then it can display the Card/PostIts and populate its dictionary at the same time
    var cards = dropzone.get_children()
    var post_it_panels = get_child(0).get_child(1).get_child(0).get_children()
    var post_its = Array()
    
    for panel in post_it_panels:
        post_its.push_back(panel.get_child(1))
            
    area_dict["dropzone_content"] = cards            # will be selected on the left side
    area_dict["post_it_panels"] = post_it_panels     # to remember panel positions
    area_dict["post_its_in_list"] = post_its         # will be selected on the right side

    currently_selected_node = area_dict["dropzone_content"][0]  # set first Card as currently selected node by default
    
    reorder_areas("dropzone_content")
    
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
    
    # Reset information about Areas being dragged, if the mouse is not longer pressed.
    # Needed because otherwise it can happen that the areas don't register it if you stop clicking on them.
    if !Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) and is_area_dragged:
        currently_dragged_area.is_dragged = false
        is_area_dragged = false
        currently_dragged_area = null

# Will be used later to spawn Cards and Post-Its and remember them in the dictionary 
func populate_board():
    pass

# Checks if a Node is currently inside the dropzone
func is_in_dropzone(to_check: Node) -> bool:
    if (dropzone.size.x < to_check.position.x or dropzone.size.y < to_check.position.y):
        return false
    elif (to_check.position.x < 0 or to_check.position.y < 0):
        return false
    else: 
        return true

func handle_mouse_button(to_handle: Area2D, input: InputEvent, dragableType: int):
    
    # No two areas can be dragged at the same time.
    # Make sure that only the same area is dragged.
    # Otherwise overlapping areas are dragged at the same time. 
    if currently_dragged_area != null and to_handle != currently_dragged_area:
        return
    
    currently_selected_node = to_handle  # update currently selected
    currently_dragged_area = to_handle
    to_handle.is_dragged = input.pressed
    is_area_dragged = input.pressed
    
    # TODO: We need a better way to recognize whether "to_handle" is a Card or a Post-It.
    # (Tried checking for a script, didn't work, because script has no name attached.
    # Alternative might be to check for specific values within the script ("is_card" f.e))
    match dragableType:
        1: # 1 = Card
            if input.is_pressed():
                # TODO: Add function to rearrange the array based on positions in the dropzone
                print_debug(":)")
            else:
                currently_dragged_area = null
        2: # 2 = PostIt
            if input.is_pressed():
                to_handle.reparent(dropzone)
                to_handle.set_owner(self)   # needs to be here otherwise the owner disappears
                area_dict["post_its_in_list"].erase(to_handle)
                area_dict["dropzone_content"].push_back(to_handle)
                # TODO: Add function to rearrange the array based on positions in the dropzone
            else:
                if is_in_dropzone(to_handle):
                    if to_handle.has_overlapping_areas():
                        var overlaps = to_handle.get_overlapping_areas()   
                        for area in overlaps:
                            if area.get_meta("type") == "card":
                                to_handle.reparent(area)
                                to_handle.set_owner(self)
                                to_handle.position = area.get_child(3).position
                else:
                    for panel in area_dict["post_it_panels"]:
                        if panel.get_child_count() == 1:
                            to_handle.reparent(panel)
                            to_handle.set_owner(self)
                            area_dict["dropzone_content"].erase(to_handle)
                            area_dict["post_its_in_list"].push_back(to_handle)
                            # TODO: Add function to rearrange the array based on taken panel spot
                            to_handle.position = panel.get_child(0).position
                            break
                currently_dragged_area = null

func handle_hover(to_handle: Area2D):
    currently_selected_node = to_handle
    pass

# Reorders the areas in any of the dictionaries entries
# Pass the entries key in order to reorder it
func reorder_areas(reorder: String):
    var old_order = area_dict[reorder]
    var new_order = Array()
        
    for obj in old_order:
        var i = 0
        if !new_order.is_empty():
            for obj_2 in new_order:
                if obj_2.position.y < obj.position.y:
                    i += 1
        new_order.insert(i, obj)
    
    print_debug(new_order)