tool
extends MarginContainer

enum DragType {
	DRAG_NONE = 0,
	DRAG_MOVE = 1,
	DRAG_RESIZE_TOP = 1 << 1,
	DRAG_RESIZE_RIGHT = 1 << 2,
	DRAG_RESIZE_BOTTOM = 1 << 3,
	DRAG_RESIZE_LEFT = 1 << 4
};

var edited_resource : WorldGenBaseResource = null
var edited_resource_parent_size : Vector2 = Vector2()

var _edited_resource_rect_border_color : Color = Color(1, 1, 1, 1)
var _edited_resource_rect_color : Color = Color(0.8, 0.8, 0.8, 0.9)
var _editor_rect_border_size : int = 2
var _edited_resource_font_color : Color = Color(0, 0, 0, 1)
var _editor_additional_text : String = ""

var drag_type : int
var drag_offset : Vector2
var drag_offset_far : Vector2

var _rect_scale : float = 1

var _edited_resource_event_ignore : bool = false

var _plugin : EditorPlugin = null
var _undo_redo : UndoRedo = null

func set_plugin(plugin : EditorPlugin) -> void:
	_plugin = plugin
	_undo_redo = _plugin.get_undo_redo()

func _draw():
	draw_rect(Rect2(Vector2(), get_size()), _edited_resource_rect_color)
	draw_rect(Rect2(Vector2(), get_size()), _edited_resource_rect_border_color, false, _editor_rect_border_size)
	
	var font : Font = get_theme_font("font")
	
	var res_name : String = "NULL"
	
	if edited_resource:
		res_name = edited_resource.resource_name
		
	var res_cls : String = ""
	
	if edited_resource:
		res_cls = edited_resource.get_editor_class()
	
	draw_string(font, Vector2(_editor_rect_border_size, font.get_height()), res_name, _edited_resource_font_color)
	draw_string(font, Vector2(_editor_rect_border_size, font.get_height() * 2), _editor_additional_text, _edited_resource_font_color, get_rect().size.x)
	
	if res_cls != "":
		draw_string(font, Vector2(_editor_rect_border_size, font.get_height() * 3), res_cls, _edited_resource_font_color, get_rect().size.x)

func refresh() -> void:
	if !edited_resource:
		return
	
	#anchor is bottom left here
	var rect : Rect2 = edited_resource.get_rect()
	rect.position *= _rect_scale
	rect.size *= _rect_scale
	
	#anchor needs to be on top left here
	var rp : Vector2 = rect.position
	rp.y = edited_resource_parent_size.y * _rect_scale - rect.size.y - rect.position.y
	rect_position = rp
	rect_size = rect.size
	
	update()

func set_editor_rect_scale(rect_scale) -> void:
	_rect_scale = rect_scale
	
	refresh()

func set_edited_resource(res : WorldGenBaseResource):
	edited_resource = res
	
	if edited_resource:
		_edited_resource_rect_border_color = edited_resource.get_editor_rect_border_color()
		_edited_resource_rect_color = edited_resource.get_editor_rect_color()
		_editor_rect_border_size = edited_resource.get_editor_rect_border_size()
		_edited_resource_font_color = edited_resource.get_editor_font_color()
		_editor_additional_text = edited_resource.get_editor_additional_text()
	
	edited_resource.connect("changed", self, "on_edited_resource_changed")
	
	refresh()

func on_edited_resource_changed() -> void:
	if _edited_resource_event_ignore:
		return
		
	refresh()

#based on / ported from engine/scene/gui/dialogs.h and .cpp
func _notification(p_what : int) -> void:
	if (p_what == NOTIFICATION_MOUSE_EXIT):
			# Reset the mouse cursor when leaving the resizable window border.
			if (edited_resource && !edited_resource.locked && !drag_type):
				if (get_default_cursor_shape() != CURSOR_ARROW):
					set_default_cursor_shape(CURSOR_ARROW)

#based on / ported from engine/scene/gui/dialogs.h and .cpp
func _gui_input(p_event : InputEvent) -> void:
	if (p_event is InputEventMouseButton) && (p_event.get_button_index() == BUTTON_LEFT):
		var mb : InputEventMouseButton = p_event as InputEventMouseButton
		
		if (mb.is_pressed()):
			# Begin a possible dragging operation.
			drag_type = _drag_hit_test(Vector2(mb.get_position().x, mb.get_position().y))
			
			if (drag_type != DragType.DRAG_NONE):
				drag_offset = get_global_mouse_position() - get_position()
			
			drag_offset_far = get_position() + get_size() - get_global_mouse_position()
			
		elif (drag_type != DragType.DRAG_NONE && !mb.is_pressed()):
			# End a dragging operation.
			drag_type = DragType.DRAG_NONE
			
			var rect : Rect2 = get_rect()
			#rect needs to be converted back
			rect.position.y = edited_resource_parent_size.y * _rect_scale - rect.size.y - rect.position.y
			rect.position /= _rect_scale
			rect.size /= _rect_scale
			
			#edited_resource.set_rect(rect)
			_edited_resource_event_ignore = true
			_undo_redo.create_action("WE: Drag End")
			_undo_redo.add_do_method(edited_resource, "set_rect", rect)
			_undo_redo.add_undo_method(edited_resource, "set_rect", edited_resource.get_rect())
			_undo_redo.commit_action()
			_edited_resource_event_ignore = false

	if p_event is InputEventMouseMotion:
		var mm : InputEventMouseMotion = p_event as InputEventMouseMotion

		if (drag_type == DragType.DRAG_NONE):
			# Update the cursor while moving along the borders.
			var cursor = CURSOR_ARROW
			if (!edited_resource.locked):
				var preview_drag_type : int = _drag_hit_test(Vector2(mm.get_position().x, mm.get_position().y))
				
				var top_left : int = DragType.DRAG_RESIZE_TOP + DragType.DRAG_RESIZE_LEFT
				var bottom_right : int = DragType.DRAG_RESIZE_BOTTOM + DragType.DRAG_RESIZE_RIGHT
				var top_right : int = DragType.DRAG_RESIZE_TOP + DragType.DRAG_RESIZE_RIGHT
				var bottom_left : int = DragType.DRAG_RESIZE_BOTTOM + DragType.DRAG_RESIZE_LEFT
				
				match (preview_drag_type):
					DragType.DRAG_RESIZE_TOP:
						cursor = CURSOR_VSIZE
					DragType.DRAG_RESIZE_BOTTOM:
						cursor = CURSOR_VSIZE
					DragType.DRAG_RESIZE_LEFT:
						cursor = CURSOR_HSIZE
					DragType.DRAG_RESIZE_RIGHT:
						cursor = CURSOR_HSIZE
					top_left:
						cursor = CURSOR_FDIAGSIZE
					bottom_right:
						cursor = CURSOR_FDIAGSIZE
					top_right:
						cursor = CURSOR_BDIAGSIZE
					bottom_left:
						cursor = CURSOR_BDIAGSIZE
			
			if (get_cursor_shape() != cursor):
				set_default_cursor_shape(cursor);
			
		else:
			# Update while in a dragging operation.
			var global_pos : Vector2 = get_global_mouse_position()

			var rect : Rect2 = get_rect()
			var min_size : Vector2 = get_combined_minimum_size()

			if (drag_type == DragType.DRAG_MOVE):
				rect.position = global_pos - drag_offset
			else:
				if (drag_type & DragType.DRAG_RESIZE_TOP):
					var bottom : int = rect.position.y + rect.size.y
					var max_y : int = bottom - min_size.y
					rect.position.y = min(global_pos.y - drag_offset.y, max_y)
					rect.size.y = bottom - rect.position.y
				elif (drag_type & DragType.DRAG_RESIZE_BOTTOM):
					rect.size.y = global_pos.y - rect.position.y + drag_offset_far.y
				
				if (drag_type & DragType.DRAG_RESIZE_LEFT):
					var right : int = rect.position.x + rect.size.x
					var max_x : int = right - min_size.x
					rect.position.x = min(global_pos.x - drag_offset.x, max_x)
					rect.size.x = right - rect.position.x
				elif (drag_type & DragType.DRAG_RESIZE_RIGHT):
					rect.size.x = global_pos.x - rect.position.x + drag_offset_far.x

			set_size(rect.size)
			set_position(rect.position)

#based on / ported from engine/scene/gui/dialogs.h and .cpp
func _drag_hit_test(pos : Vector2) -> int:
	var drag_type : int = DragType.DRAG_NONE

	if (!edited_resource.locked):
		var scaleborder_size : int = 5 #get_theme_constant("scaleborder_size", "WindowDialog")

		var rect : Rect2 = get_rect()

		if (pos.y < (scaleborder_size)):
			drag_type = DragType.DRAG_RESIZE_TOP
		elif (pos.y >= (rect.size.y - scaleborder_size)):
			drag_type = DragType.DRAG_RESIZE_BOTTOM
		
		if (pos.x < scaleborder_size):
			drag_type |= DragType.DRAG_RESIZE_LEFT
		elif (pos.x >= (rect.size.x - scaleborder_size)):
			drag_type |= DragType.DRAG_RESIZE_RIGHT
			
		if (drag_type == DragType.DRAG_NONE):
			drag_type = DragType.DRAG_MOVE

	return drag_type