#include "animation_blend_space_editor.h"

#include "core/io/resource_loader.h"
#include "core/project_settings.h"
#include "os/input.h"
#include "os/keyboard.h"
#include "scene/animation/animation_blend_tree.h"
#include "scene/animation/animation_player.h"
#include "scene/gui/menu_button.h"
#include "scene/gui/panel.h"
#include "scene/main/viewport.h"

void AnimationNodeBlendSpaceEditor::edit(AnimationNodeBlendSpace *p_blend_space) {

	blend_space = p_blend_space;

	if (!blend_space) {
		hide();
	} else {
		_update_space();
	}
}

void AnimationNodeBlendSpaceEditor::_blend_space_gui_input(const Ref<InputEvent> &p_event) {

	Ref<InputEventMouseButton> mb = p_event;

	if (mb.is_valid() && mb->is_pressed() && ((tool_select->is_pressed() && mb->get_button_index() == BUTTON_RIGHT) || (mb->get_button_index() == BUTTON_LEFT && tool_create->is_pressed()))) {
		menu->clear();
		animations_menu->clear();
		animations_to_add.clear();
		List<StringName> classes;
		classes.sort_custom<StringName::AlphCompare>();

		ClassDB::get_inheriters_from_class("AnimationRootNode", &classes);
		menu->add_submenu_item(TTR("Add Animation"), "animations");

		AnimationGraphPlayer *gp = blend_space->get_graph_player();
		ERR_FAIL_COND(!gp);
		if (gp && gp->has_node(gp->get_animation_player())) {
			AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(gp->get_node(gp->get_animation_player()));
			if (ap) {
				List<StringName> names;
				ap->get_animation_list(&names);
				for (List<StringName>::Element *E = names.front(); E; E = E->next()) {
					animations_menu->add_icon_item(get_icon("Animation", "EditorIcons"), E->get());
					animations_to_add.push_back(E->get());
				}
			}
		}

		for (List<StringName>::Element *E = classes.front(); E; E = E->next()) {

			String name = String(E->get()).replace_first("AnimationNode", "");
			if (name == "Animation")
				continue; // nope
			int idx = menu->get_item_count();
			menu->add_item(vformat("Add %s", name));
			menu->set_item_metadata(idx, E->get());
		}

		menu->set_global_position(blend_space_draw->get_global_transform().xform(mb->get_position()));
		menu->popup();
		add_point_pos = (mb->get_position() / blend_space_draw->get_size());
		add_point_pos.y = 1.0 - add_point_pos.y;
		add_point_pos *= (blend_space->get_max_space() - blend_space->get_min_space());
		add_point_pos += blend_space->get_min_space();

		if (snap->is_pressed()) {
			add_point_pos.x = Math::stepify(add_point_pos.x, blend_space->get_snap().x);
			add_point_pos.y = Math::stepify(add_point_pos.y, blend_space->get_snap().y);
		}
	}

	if (mb.is_valid() && mb->is_pressed() && tool_select->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {

		blend_space_draw->update(); //update anyway
		//try to see if a point can be selected
		selected_point = -1;
		selected_triangle = -1;
		_update_tool_erase();

		for (int i = 0; i < points.size(); i++) {

			if (points[i].distance_to(mb->get_position()) < 10 * EDSCALE) {
				selected_point = i;
				Ref<AnimationNode> node = blend_space->get_blend_point_node(i);
				EditorNode::get_singleton()->push_item(node.ptr(), "", true);
				dragging_selected_attempt = true;
				drag_from = mb->get_position();
				_update_tool_erase();
				_update_edited_point_pos();
				return;
			}
		}

		//then try to see if a triangle can be selected

		for (int i = 0; i < blend_space->get_triangle_count(); i++) {
			Vector<Vector2> triangle;

			for (int j = 0; j < 3; j++) {
				int idx = blend_space->get_triangle_point(i, j);
				ERR_FAIL_INDEX(idx, points.size());
				triangle.push_back(points[idx]);
			}

			if (Geometry::is_point_in_triangle(mb->get_position(), triangle[0], triangle[1], triangle[2])) {
				selected_triangle = i;
				_update_tool_erase();
				return;
			}
		}
	}

	if (mb.is_valid() && mb->is_pressed() && tool_triangle->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {

		blend_space_draw->update(); //update anyway
		//try to see if a point can be selected
		selected_point = -1;

		for (int i = 0; i < points.size(); i++) {

			if (making_triangle.find(i) != -1)
				continue;

			if (points[i].distance_to(mb->get_position()) < 10 * EDSCALE) {
				making_triangle.push_back(i);
				if (making_triangle.size() == 3) {
					//add triangle!
					if (blend_space->has_triangle(making_triangle[0], making_triangle[1], making_triangle[2])) {
						making_triangle.clear();
						EditorNode::get_singleton()->show_warning(TTR("Triangle already exists"));
						return;
					}

					updating = true;
					undo_redo->create_action("Add Triangle");
					undo_redo->add_do_method(blend_space, "add_triangle", making_triangle[0], making_triangle[1], making_triangle[2]);
					undo_redo->add_undo_method(blend_space, "remove_triangle", blend_space->get_triangle_count());
					undo_redo->add_do_method(this, "_update_space");
					undo_redo->add_undo_method(this, "_update_space");
					undo_redo->commit_action();
					updating = false;
					making_triangle.clear();
				}
				return;
			}
		}
	}

	if (mb.is_valid() && !mb->is_pressed() && dragging_selected_attempt && mb->get_button_index() == BUTTON_LEFT) {
		if (dragging_selected) {
			//move
			Vector2 point = blend_space->get_blend_point_position(selected_point);
			point += drag_ofs;
			if (snap->is_pressed()) {
				point.x = Math::stepify(point.x, blend_space->get_snap().x);
				point.y = Math::stepify(point.y, blend_space->get_snap().y);
			}

			updating = true;
			undo_redo->create_action("Move Node Point");
			undo_redo->add_do_method(blend_space, "set_blend_point_position", selected_point, point);
			undo_redo->add_undo_method(blend_space, "set_blend_point_position", selected_point, blend_space->get_blend_point_position(selected_point));
			undo_redo->add_do_method(this, "_update_space");
			undo_redo->add_undo_method(this, "_update_space");
			undo_redo->add_do_method(this, "_update_edited_point_pos");
			undo_redo->add_undo_method(this, "_update_edited_point_pos");
			undo_redo->commit_action();
			updating = false;
			_update_edited_point_pos();
		}
		dragging_selected_attempt = false;
		dragging_selected = false;
		blend_space_draw->update();
	}

	if (mb.is_valid() && mb->is_pressed() && tool_blend->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {

		Vector2 blend_pos = (mb->get_position() / blend_space_draw->get_size());
		blend_pos.y = 1.0 - blend_pos.y;
		blend_pos *= (blend_space->get_max_space() - blend_space->get_min_space());
		blend_pos += blend_space->get_min_space();

		blend_space->set_blend_pos(blend_pos);
		blend_space_draw->update();
	}

	Ref<InputEventMouseMotion> mm = p_event;

	if (mm.is_valid() && dragging_selected_attempt) {
		dragging_selected = true;
		drag_ofs = ((mm->get_position() - drag_from) / blend_space_draw->get_size()) * (blend_space->get_max_space() - blend_space->get_min_space()) * Vector2(1, -1);
		blend_space_draw->update();
		_update_edited_point_pos();
	}

	if (mm.is_valid() && tool_triangle->is_pressed() && making_triangle.size()) {
		blend_space_draw->update();
	}

	if (mm.is_valid() && !tool_triangle->is_pressed() && making_triangle.size()) {
		making_triangle.clear();
		blend_space_draw->update();
	}

	if (mm.is_valid() && tool_blend->is_pressed() && mm->get_button_mask() & BUTTON_MASK_LEFT) {

		Vector2 blend_pos = (mm->get_position() / blend_space_draw->get_size());
		blend_pos.y = 1.0 - blend_pos.y;
		blend_pos *= (blend_space->get_max_space() - blend_space->get_min_space());
		blend_pos += blend_space->get_min_space();

		blend_space->set_blend_pos(blend_pos);
		blend_space_draw->update();
	}
}

void AnimationNodeBlendSpaceEditor::_add_menu_type(int p_index) {

	String type = menu->get_item_metadata(p_index);
	print_line("type: " + type);
	Object *obj = ClassDB::instance(type);
	ERR_FAIL_COND(!obj);
	AnimationNode *an = Object::cast_to<AnimationNode>(obj);
	ERR_FAIL_COND(!an);

	Ref<AnimationNode> node(an);

	updating = true;
	undo_redo->create_action("Add Node Point");
	undo_redo->add_do_method(blend_space, "add_blend_point", node, add_point_pos);
	undo_redo->add_undo_method(blend_space, "remove_blend_point", blend_space->get_blend_point_count());
	undo_redo->add_do_method(this, "_update_space");
	undo_redo->add_undo_method(this, "_update_space");
	undo_redo->commit_action();
	updating = false;

	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_add_animation_type(int p_index) {

	Ref<AnimationNodeAnimation> anim;
	anim.instance();

	anim->set_animation(animations_to_add[p_index]);

	updating = true;
	undo_redo->create_action("Add Animation Point");
	undo_redo->add_do_method(blend_space, "add_blend_point", anim, add_point_pos);
	undo_redo->add_undo_method(blend_space, "remove_blend_point", blend_space->get_blend_point_count());
	undo_redo->add_do_method(this, "_update_space");
	undo_redo->add_undo_method(this, "_update_space");
	undo_redo->commit_action();
	updating = false;

	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_update_tool_erase() {
	tool_erase->set_disabled(!(selected_point >= 0 && selected_point < blend_space->get_blend_point_count()) && !(selected_triangle >= 0 && selected_triangle < blend_space->get_triangle_count()));
	if (selected_point >= 0 && selected_point < blend_space->get_blend_point_count()) {
		Ref<AnimationNode> an = blend_space->get_blend_point_node(selected_point);
		if (EditorNode::get_singleton()->item_has_editor(an.ptr())) {
			open_editor->show();
		} else {
			open_editor->hide();
		}
		edit_hb->show();
	} else {
		edit_hb->hide();
	}
}

void AnimationNodeBlendSpaceEditor::_tool_switch(int p_tool) {
	making_triangle.clear();

	if (p_tool == 0) {
		tool_erase->show();
		tool_erase_sep->show();
	} else {
		tool_erase->hide();
		tool_erase_sep->hide();
	}
	_update_tool_erase();
	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_blend_space_draw() {

	Color linecolor = get_color("font_color", "Label");
	Color linecolor_soft = linecolor;
	linecolor_soft.a *= 0.5;
	Ref<Font> font = get_font("font", "Label");
	Ref<Texture> icon = get_icon("KeyValue", "EditorIcons");
	Ref<Texture> icon_selected = get_icon("KeySelected", "EditorIcons");

	Size2 s = blend_space_draw->get_size();

	blend_space_draw->draw_line(Point2(0, 0), Point2(0, s.height), linecolor);
	blend_space_draw->draw_line(Point2(0, s.height - 1), Point2(s.width, s.height - 1), linecolor);

	blend_space_draw->draw_line(Point2(0, 0), Point2(5 * EDSCALE, 0), linecolor);
	if (blend_space->get_min_space().y < 0) {
		int y = (blend_space->get_max_space().y / (blend_space->get_max_space().y - blend_space->get_min_space().y)) * s.height;
		blend_space_draw->draw_line(Point2(0, y), Point2(5 * EDSCALE, y), linecolor);
		blend_space_draw->draw_string(font, Point2(2 * EDSCALE, y - font->get_height() + font->get_ascent()), "0", linecolor);
		blend_space_draw->draw_line(Point2(5 * EDSCALE, y), Point2(s.width, y), linecolor_soft);
	}

	if (blend_space->get_min_space().x < 0) {
		int x = (blend_space->get_max_space().x / (blend_space->get_max_space().x - blend_space->get_min_space().x)) * s.width;
		blend_space_draw->draw_line(Point2(x, s.height - 1), Point2(x, s.height - 5 * EDSCALE), linecolor);
		blend_space_draw->draw_string(font, Point2(x + 2 * EDSCALE, s.height - 2 * EDSCALE - font->get_height() + font->get_ascent()), "0", linecolor);
		blend_space_draw->draw_line(Point2(x, s.height - 5 * EDSCALE), Point2(x, 0), linecolor_soft);
	}

	if (snap->is_pressed()) {

		linecolor_soft.a = linecolor.a * 0.1;

		if (blend_space->get_snap().x > 0) {

			int prev_idx;
			for (int i = 0; i < s.x; i++) {

				float v = blend_space->get_min_space().x + i * (blend_space->get_max_space().x - blend_space->get_min_space().x) / s.x;
				int idx = int(v / blend_space->get_snap().x);

				if (i > 0 && prev_idx != idx) {
					blend_space_draw->draw_line(Point2(i, 0), Point2(i, s.height), linecolor_soft);
				}

				prev_idx = idx;
			}
		}

		if (blend_space->get_snap().y > 0) {

			int prev_idx;
			for (int i = 0; i < s.y; i++) {

				float v = blend_space->get_max_space().y - i * (blend_space->get_max_space().y - blend_space->get_min_space().y) / s.y;
				int idx = int(v / blend_space->get_snap().y);

				if (i > 0 && prev_idx != idx) {
					blend_space_draw->draw_line(Point2(0, i), Point2(s.width, i), linecolor_soft);
				}

				prev_idx = idx;
			}
		}
	}

	//triangles first
	for (int i = 0; i < blend_space->get_triangle_count(); i++) {

		Vector<Vector2> points;
		points.resize(3);

		for (int j = 0; j < 3; j++) {
			int point_idx = blend_space->get_triangle_point(i, j);
			Vector2 point = blend_space->get_blend_point_position(point_idx);
			if (dragging_selected && selected_point == point_idx) {
				point += drag_ofs;
				if (snap->is_pressed()) {
					point.x = Math::stepify(point.x, blend_space->get_snap().x);
					point.y = Math::stepify(point.y, blend_space->get_snap().y);
				}
			}
			point = (point - blend_space->get_min_space()) / (blend_space->get_max_space() - blend_space->get_min_space());
			point *= s;
			point.y = s.height - point.y;
			points[j] = point;
		}

		for (int j = 0; j < 3; j++) {
			blend_space_draw->draw_line(points[j], points[(j + 1) % 3], linecolor, 1, true);
		}

		Color color;
		if (i == selected_triangle) {
			color = get_color("accent_color", "Editor");
			color.a *= 0.5;
		} else {
			color = linecolor;
			color.a *= 0.2;
		}

		Vector<Color> colors;
		colors.push_back(color);
		colors.push_back(color);
		colors.push_back(color);
		blend_space_draw->draw_primitive(points, colors, Vector<Vector2>());
	}

	points.clear();
	for (int i = 0; i < blend_space->get_blend_point_count(); i++) {

		Vector2 point = blend_space->get_blend_point_position(i);
		if (dragging_selected && selected_point == i) {
			point += drag_ofs;
			if (snap->is_pressed()) {
				point.x = Math::stepify(point.x, blend_space->get_snap().x);
				point.y = Math::stepify(point.y, blend_space->get_snap().y);
			}
		}
		point = (point - blend_space->get_min_space()) / (blend_space->get_max_space() - blend_space->get_min_space());
		point *= s;
		point.y = s.height - point.y;

		points.push_back(point);
		point -= (icon->get_size() / 2);
		point = point.floor();

		if (i == selected_point) {
			blend_space_draw->draw_texture(icon_selected, point);
		} else {
			blend_space_draw->draw_texture(icon, point);
		}
	}

	if (making_triangle.size()) {
		Vector<Vector2> points;
		for (int i = 0; i < making_triangle.size(); i++) {
			Vector2 point = blend_space->get_blend_point_position(making_triangle[i]);
			point = (point - blend_space->get_min_space()) / (blend_space->get_max_space() - blend_space->get_min_space());
			point *= s;
			point.y = s.height - point.y;
			points.push_back(point);
		}

		for (int i = 0; i < points.size() - 1; i++) {
			blend_space_draw->draw_line(points[i], points[i + 1], linecolor, 2, true);
		}
		blend_space_draw->draw_line(points[points.size() - 1], blend_space_draw->get_local_mouse_position(), linecolor, 2, true);
	}

	///draw cursor position

	{
		Color color;
		if (tool_blend->is_pressed()) {
			color = get_color("accent_color", "Editor");
		} else {
			color = linecolor;
			color.a *= 0.5;
		}

		Vector2 point = blend_space->get_blend_pos();
		point = (point - blend_space->get_min_space()) / (blend_space->get_max_space() - blend_space->get_min_space());
		point *= s;
		point.y = s.height - point.y;

		if (blend_space->get_triangle_count()) {
			Vector2 closest = blend_space->get_closest_point(blend_space->get_blend_pos());
			closest = (closest - blend_space->get_min_space()) / (blend_space->get_max_space() - blend_space->get_min_space());
			closest *= s;
			closest.y = s.height - closest.y;

			Color lcol = color;
			lcol.a *= 0.4;
			blend_space_draw->draw_line(point, closest, lcol, 2);
		}

		float mind = 5 * EDSCALE;
		float maxd = 15 * EDSCALE;
		blend_space_draw->draw_line(point + Vector2(mind, 0), point + Vector2(maxd, 0), color, 2);
		blend_space_draw->draw_line(point + Vector2(-mind, 0), point + Vector2(-maxd, 0), color, 2);
		blend_space_draw->draw_line(point + Vector2(0, mind), point + Vector2(0, maxd), color, 2);
		blend_space_draw->draw_line(point + Vector2(0, -mind), point + Vector2(0, -maxd), color, 2);
	}
}

void AnimationNodeBlendSpaceEditor::_snap_toggled() {

	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_update_space() {

	if (updating)
		return;

	updating = true;

	if (blend_space->get_parent().is_valid()) {
		goto_parent_hb->show();
	} else {
		goto_parent_hb->hide();
	}
	max_x_value->set_value(blend_space->get_max_space().x);
	max_y_value->set_value(blend_space->get_max_space().y);

	min_x_value->set_value(blend_space->get_min_space().x);
	min_y_value->set_value(blend_space->get_min_space().y);

	label_x->set_text(blend_space->get_x_label());
	label_y->set_text(blend_space->get_y_label());

	snap_x->set_value(blend_space->get_snap().x);
	snap_y->set_value(blend_space->get_snap().y);

	blend_space_draw->update();

	updating = false;
}

void AnimationNodeBlendSpaceEditor::_config_changed(double) {
	if (updating)
		return;

	updating = true;
	undo_redo->create_action("Change BlendSpace Limits");
	undo_redo->add_do_method(blend_space, "set_max_space", Vector2(max_x_value->get_value(), max_y_value->get_value()));
	undo_redo->add_undo_method(blend_space, "set_max_space", blend_space->get_max_space());
	undo_redo->add_do_method(blend_space, "set_min_space", Vector2(min_x_value->get_value(), min_y_value->get_value()));
	undo_redo->add_undo_method(blend_space, "set_min_space", blend_space->get_min_space());
	undo_redo->add_do_method(blend_space, "set_snap", Vector2(snap_x->get_value(), snap_y->get_value()));
	undo_redo->add_undo_method(blend_space, "set_snap", blend_space->get_snap());
	undo_redo->add_do_method(this, "_update_space");
	undo_redo->add_undo_method(this, "_update_space");
	undo_redo->commit_action();
	updating = false;

	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_labels_changed(String) {
	if (updating)
		return;

	updating = true;
	undo_redo->create_action("Change BlendSpace Labels", UndoRedo::MERGE_ENDS);
	undo_redo->add_do_method(blend_space, "set_x_label", label_x->get_text());
	undo_redo->add_undo_method(blend_space, "set_x_label", blend_space->get_x_label());
	undo_redo->add_do_method(blend_space, "set_y_label", label_y->get_text());
	undo_redo->add_undo_method(blend_space, "set_y_label", blend_space->get_y_label());
	undo_redo->add_do_method(this, "_update_space");
	undo_redo->add_undo_method(this, "_update_space");
	undo_redo->commit_action();
	updating = false;
}

void AnimationNodeBlendSpaceEditor::_erase_selected() {

	if (selected_point != -1) {

		updating = true;
		undo_redo->create_action("Remove BlendSpace Point");
		undo_redo->add_do_method(blend_space, "remove_blend_point", selected_point);
		undo_redo->add_undo_method(blend_space, "add_blend_point", blend_space->get_blend_point_node(selected_point), blend_space->get_blend_point_position(selected_point), selected_point);

		//restore triangles using this point
		for (int i = 0; i < blend_space->get_triangle_count(); i++) {
			for (int j = 0; j < 3; j++) {
				if (blend_space->get_triangle_point(i, j) == selected_point) {
					undo_redo->add_undo_method(blend_space, "add_triangle", blend_space->get_triangle_point(i, 0), blend_space->get_triangle_point(i, 1), blend_space->get_triangle_point(i, 2), i);
					break;
				}
			}
		}

		undo_redo->add_do_method(this, "_update_space");
		undo_redo->add_undo_method(this, "_update_space");
		undo_redo->commit_action();
		updating = false;

		blend_space_draw->update();
	} else if (selected_triangle != -1) {

		updating = true;
		undo_redo->create_action("Remove BlendSpace Triangle");
		undo_redo->add_do_method(blend_space, "remove_triangle", selected_triangle);
		undo_redo->add_undo_method(blend_space, "add_triangle", blend_space->get_triangle_point(selected_triangle, 0), blend_space->get_triangle_point(selected_triangle, 1), blend_space->get_triangle_point(selected_triangle, 2), selected_triangle);

		undo_redo->add_do_method(this, "_update_space");
		undo_redo->add_undo_method(this, "_update_space");
		undo_redo->commit_action();
		updating = false;

		blend_space_draw->update();
	}
}

void AnimationNodeBlendSpaceEditor::_update_edited_point_pos() {
	if (updating)
		return;

	if (selected_point >= 0 && selected_point < blend_space->get_blend_point_count()) {
		Vector2 pos = blend_space->get_blend_point_position(selected_point);
		if (dragging_selected) {
			pos += drag_ofs;
			if (snap->is_pressed()) {
				pos.x = Math::stepify(pos.x, blend_space->get_snap().x);
				pos.y = Math::stepify(pos.y, blend_space->get_snap().y);
			}
		}
		updating = true;
		edit_x->set_value(pos.x);
		edit_y->set_value(pos.y);
		updating = false;
	}
}

void AnimationNodeBlendSpaceEditor::_edit_point_pos(double) {
	if (updating)
		return;
	updating = true;
	undo_redo->create_action("Move Node Point");
	undo_redo->add_do_method(blend_space, "set_blend_point_position", selected_point, Vector2(edit_x->get_value(), edit_y->get_value()));
	undo_redo->add_undo_method(blend_space, "set_blend_point_position", selected_point, blend_space->get_blend_point_position(selected_point));
	undo_redo->add_do_method(this, "_update_space");
	undo_redo->add_undo_method(this, "_update_space");
	undo_redo->add_do_method(this, "_update_edited_point_pos");
	undo_redo->add_undo_method(this, "_update_edited_point_pos");
	undo_redo->commit_action();
	updating = false;

	blend_space_draw->update();
}

void AnimationNodeBlendSpaceEditor::_notification(int p_what) {

	if (p_what == NOTIFICATION_ENTER_TREE || p_what == NOTIFICATION_THEME_CHANGED) {
		error_panel->add_style_override("panel", get_stylebox("bg", "Tree"));
		error_label->add_color_override("font_color", get_color("error_color", "Editor"));
		panel->add_style_override("panel", get_stylebox("bg", "Tree"));
		tool_blend->set_icon(get_icon("EditPivot", "EditorIcons"));
		tool_select->set_icon(get_icon("ToolSelect", "EditorIcons"));
		tool_create->set_icon(get_icon("EditKey", "EditorIcons"));
		tool_triangle->set_icon(get_icon("ToolTriangle", "EditorIcons"));
		tool_erase->set_icon(get_icon("Remove", "EditorIcons"));
		snap->set_icon(get_icon("SnapGrid", "EditorIcons"));
		open_editor->set_icon(get_icon("Edit", "EditorIcons"));
		goto_parent->set_icon(get_icon("MoveUp", "EditorIcons"));
	}

	if (p_what == NOTIFICATION_PROCESS) {

		String error;

		if (!blend_space->get_graph_player()) {
			error = TTR("BlendSpace does not belong to an AnimationGraphPlayer node.");
		} else if (!blend_space->get_graph_player()->is_active()) {
			error = TTR("AnimationGraphPlayer is inactive.\nActivate to enable playback, check node warnings if activation fails.");
		} else if (blend_space->get_graph_player()->is_state_invalid()) {
			error = blend_space->get_graph_player()->get_invalid_state_reason();
		} else if (blend_space->get_triangle_count() == 0) {
			error = TTR("No triangles exist, so no blending can take place.");
		}

		if (error != error_label->get_text()) {
			error_label->set_text(error);
			if (error != String()) {
				error_panel->show();
			} else {
				error_panel->hide();
			}
		}
	}
}

void AnimationNodeBlendSpaceEditor::_open_editor() {

	if (selected_point >= 0 && selected_point < blend_space->get_blend_point_count()) {
		Ref<AnimationNode> an = blend_space->get_blend_point_node(selected_point);
		ERR_FAIL_COND(!an.is_valid());
		EditorNode::get_singleton()->edit_item(an.ptr());
	}
}

void AnimationNodeBlendSpaceEditor::_goto_parent() {

	EditorNode::get_singleton()->edit_item(blend_space->get_parent().ptr());
}

void AnimationNodeBlendSpaceEditor::_bind_methods() {

	ClassDB::bind_method("_blend_space_gui_input", &AnimationNodeBlendSpaceEditor::_blend_space_gui_input);
	ClassDB::bind_method("_blend_space_draw", &AnimationNodeBlendSpaceEditor::_blend_space_draw);
	ClassDB::bind_method("_config_changed", &AnimationNodeBlendSpaceEditor::_config_changed);
	ClassDB::bind_method("_labels_changed", &AnimationNodeBlendSpaceEditor::_labels_changed);
	ClassDB::bind_method("_update_space", &AnimationNodeBlendSpaceEditor::_update_space);
	ClassDB::bind_method("_snap_toggled", &AnimationNodeBlendSpaceEditor::_snap_toggled);
	ClassDB::bind_method("_tool_switch", &AnimationNodeBlendSpaceEditor::_tool_switch);
	ClassDB::bind_method("_erase_selected", &AnimationNodeBlendSpaceEditor::_erase_selected);
	ClassDB::bind_method("_update_tool_erase", &AnimationNodeBlendSpaceEditor::_update_tool_erase);
	ClassDB::bind_method("_edit_point_pos", &AnimationNodeBlendSpaceEditor::_edit_point_pos);

	ClassDB::bind_method("_add_menu_type", &AnimationNodeBlendSpaceEditor::_add_menu_type);
	ClassDB::bind_method("_add_animation_type", &AnimationNodeBlendSpaceEditor::_add_animation_type);

	ClassDB::bind_method("_update_edited_point_pos", &AnimationNodeBlendSpaceEditor::_update_edited_point_pos);

	ClassDB::bind_method("_open_editor", &AnimationNodeBlendSpaceEditor::_open_editor);
	ClassDB::bind_method("_goto_parent", &AnimationNodeBlendSpaceEditor::_goto_parent);
}

AnimationNodeBlendSpaceEditor *AnimationNodeBlendSpaceEditor::singleton = NULL;

AnimationNodeBlendSpaceEditor::AnimationNodeBlendSpaceEditor() {

	singleton = this;
	updating = false;

	blend_space = NULL;

	HBoxContainer *top_hb = memnew(HBoxContainer);
	add_child(top_hb);

	Ref<ButtonGroup> bg;
	bg.instance();

	goto_parent_hb = memnew(HBoxContainer);
	top_hb->add_child(goto_parent_hb);
	goto_parent = memnew(ToolButton);
	goto_parent->connect("pressed", this, "_goto_parent", varray(), CONNECT_DEFERRED);
	goto_parent_hb->add_child(goto_parent);
	goto_parent_hb->add_child(memnew(VSeparator));
	goto_parent_hb->hide();

	tool_blend = memnew(ToolButton);
	tool_blend->set_toggle_mode(true);
	tool_blend->set_button_group(bg);
	top_hb->add_child(tool_blend);
	tool_blend->set_pressed(true);
	tool_blend->set_tooltip(TTR("Set the blending position within the space"));
	tool_blend->connect("pressed", this, "_tool_switch", varray(3));

	tool_select = memnew(ToolButton);
	tool_select->set_toggle_mode(true);
	tool_select->set_button_group(bg);
	top_hb->add_child(tool_select);
	tool_select->set_tooltip(TTR("Select and move points, create points with RMB."));
	tool_select->connect("pressed", this, "_tool_switch", varray(0));

	tool_create = memnew(ToolButton);
	tool_create->set_toggle_mode(true);
	tool_create->set_button_group(bg);
	top_hb->add_child(tool_create);
	tool_create->set_tooltip(TTR("Create points."));
	tool_create->connect("pressed", this, "_tool_switch", varray(1));

	tool_triangle = memnew(ToolButton);
	tool_triangle->set_toggle_mode(true);
	tool_triangle->set_button_group(bg);
	top_hb->add_child(tool_triangle);
	tool_triangle->set_tooltip(TTR("Create triangles by connecting points."));
	tool_triangle->connect("pressed", this, "_tool_switch", varray(2));

	tool_erase_sep = memnew(VSeparator);
	top_hb->add_child(tool_erase_sep);
	tool_erase = memnew(ToolButton);
	top_hb->add_child(tool_erase);
	tool_erase->set_tooltip(TTR("Erase points and triangles."));
	tool_erase->connect("pressed", this, "_erase_selected");
	tool_erase->set_disabled(true);

	top_hb->add_child(memnew(VSeparator));

	snap = memnew(ToolButton);
	snap->set_toggle_mode(true);
	top_hb->add_child(snap);
	//snap->set_text(TTR("Snap"));
	snap->set_pressed(true);
	snap->connect("pressed", this, "_snap_toggled");

	snap_x = memnew(SpinBox);
	top_hb->add_child(snap_x);
	snap_x->set_prefix("x:");
	snap_x->set_min(0.01);
	snap_x->set_step(0.01);
	snap_x->set_max(1000);

	snap_y = memnew(SpinBox);
	top_hb->add_child(snap_y);
	snap_y->set_prefix("y:");
	snap_y->set_min(0.01);
	snap_y->set_step(0.01);
	snap_y->set_max(1000);

	edit_hb = memnew(HBoxContainer);
	top_hb->add_child(edit_hb);
	edit_hb->add_child(memnew(VSeparator));
	edit_hb->add_child(memnew(Label(TTR("Point"))));
	edit_x = memnew(SpinBox);
	edit_hb->add_child(edit_x);
	edit_x->set_min(-1000);
	edit_x->set_step(0.01);
	edit_x->set_max(1000);
	edit_x->connect("value_changed", this, "_edit_point_pos");
	edit_y = memnew(SpinBox);
	edit_hb->add_child(edit_y);
	edit_y->set_min(-1000);
	edit_y->set_step(0.01);
	edit_y->set_max(1000);
	edit_y->connect("value_changed", this, "_edit_point_pos");
	open_editor = memnew(Button);
	edit_hb->add_child(open_editor);
	open_editor->set_text(TTR("Open Editor"));
	open_editor->connect("pressed", this, "_open_editor", varray(), CONNECT_DEFERRED);
	edit_hb->hide();
	open_editor->hide();

	HBoxContainer *main_hb = memnew(HBoxContainer);
	add_child(main_hb);
	main_hb->set_v_size_flags(SIZE_EXPAND_FILL);

	GridContainer *main_grid = memnew(GridContainer);
	main_grid->set_columns(2);
	main_hb->add_child(main_grid);
	main_grid->set_h_size_flags(SIZE_EXPAND_FILL);
	{
		VBoxContainer *left_vbox = memnew(VBoxContainer);
		main_grid->add_child(left_vbox);
		left_vbox->set_v_size_flags(SIZE_EXPAND_FILL);
		max_y_value = memnew(SpinBox);
		left_vbox->add_child(max_y_value);
		left_vbox->add_spacer();
		label_y = memnew(LineEdit);
		left_vbox->add_child(label_y);
		label_y->set_expand_to_text_length(true);
		left_vbox->add_spacer();
		min_y_value = memnew(SpinBox);
		left_vbox->add_child(min_y_value);

		max_y_value->set_max(10000);
		max_y_value->set_min(0.01);
		max_y_value->set_step(0.01);

		min_y_value->set_min(-10000);
		min_y_value->set_max(0);
		min_y_value->set_step(0.01);
	}

	panel = memnew(PanelContainer);
	panel->set_clip_contents(true);
	main_grid->add_child(panel);
	panel->set_h_size_flags(SIZE_EXPAND_FILL);

	blend_space_draw = memnew(Control);
	blend_space_draw->connect("gui_input", this, "_blend_space_gui_input");
	blend_space_draw->connect("draw", this, "_blend_space_draw");
	panel->add_child(blend_space_draw);
	main_grid->add_child(memnew(Control)); //empty bottom left

	{
		HBoxContainer *bottom_vbox = memnew(HBoxContainer);
		main_grid->add_child(bottom_vbox);
		bottom_vbox->set_h_size_flags(SIZE_EXPAND_FILL);
		min_x_value = memnew(SpinBox);
		bottom_vbox->add_child(min_x_value);
		bottom_vbox->add_spacer();
		label_x = memnew(LineEdit);
		bottom_vbox->add_child(label_x);
		label_x->set_expand_to_text_length(true);
		bottom_vbox->add_spacer();
		max_x_value = memnew(SpinBox);
		bottom_vbox->add_child(max_x_value);

		max_x_value->set_max(10000);
		max_x_value->set_min(0.01);
		max_x_value->set_step(0.01);

		min_x_value->set_min(-10000);
		min_x_value->set_max(0);
		min_x_value->set_step(0.01);
	}

	snap_x->connect("value_changed", this, "_config_changed");
	snap_y->connect("value_changed", this, "_config_changed");
	max_x_value->connect("value_changed", this, "_config_changed");
	min_x_value->connect("value_changed", this, "_config_changed");
	max_y_value->connect("value_changed", this, "_config_changed");
	min_y_value->connect("value_changed", this, "_config_changed");
	label_x->connect("text_changed", this, "_labels_changed");
	label_y->connect("text_changed", this, "_labels_changed");

	error_panel = memnew(PanelContainer);
	add_child(error_panel);
	error_label = memnew(Label);
	error_panel->add_child(error_label);
	error_label->set_text("eh");

	undo_redo = EditorNode::get_singleton()->get_undo_redo();

	set_custom_minimum_size(Size2(0, 300 * EDSCALE));

	menu = memnew(PopupMenu);
	add_child(menu);
	menu->connect("index_pressed", this, "_add_menu_type");

	animations_menu = memnew(PopupMenu);
	menu->add_child(animations_menu);
	animations_menu->set_name("animations");
	animations_menu->connect("index_pressed", this, "_add_animation_type");

	selected_point = -1;
	selected_triangle = -1;

	dragging_selected = false;
	dragging_selected_attempt = false;
}

void AnimationNodeBlendSpaceEditorPlugin::edit(Object *p_object) {

	anim_tree_editor->edit(Object::cast_to<AnimationNodeBlendSpace>(p_object));
}

bool AnimationNodeBlendSpaceEditorPlugin::handles(Object *p_object) const {

	return p_object->is_class("AnimationNodeBlendSpace");
}

void AnimationNodeBlendSpaceEditorPlugin::make_visible(bool p_visible) {

	if (p_visible) {
		//editor->hide_animation_player_editors();
		//editor->animation_panel_make_visible(true);
		button->show();
		editor->make_bottom_panel_item_visible(anim_tree_editor);
		anim_tree_editor->set_process(true);
	} else {

		if (anim_tree_editor->is_visible_in_tree())
			editor->hide_bottom_panel();
		button->hide();
		anim_tree_editor->set_process(false);
	}
}

AnimationNodeBlendSpaceEditorPlugin::AnimationNodeBlendSpaceEditorPlugin(EditorNode *p_node) {

	editor = p_node;
	anim_tree_editor = memnew(AnimationNodeBlendSpaceEditor);
	anim_tree_editor->set_custom_minimum_size(Size2(0, 300));

	button = editor->add_bottom_panel_item(TTR("BlendSpace"), anim_tree_editor);
	button->hide();
}

AnimationNodeBlendSpaceEditorPlugin::~AnimationNodeBlendSpaceEditorPlugin() {
}