/*************************************************************************/
/*  collision_polygon_2d_editor_plugin.cpp                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "collision_polygon_2d_editor_plugin.h"

#include "canvas_item_editor_plugin.h"
#include "editor/editor_settings.h"
#include "os/file_access.h"

void CollisionPolygon2DEditor::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_READY: {

			button_create->set_icon(get_icon("Edit", "EditorIcons"));
			button_edit->set_icon(get_icon("MovePoint", "EditorIcons"));
			button_edit->set_pressed(true);
			get_tree()->connect("node_removed", this, "_node_removed");

		} break;
		case NOTIFICATION_FIXED_PROCESS: {

		} break;
	}
}
void CollisionPolygon2DEditor::_node_removed(Node *p_node) {

	if (p_node == node) {
		node = NULL;
		hide();
		canvas_item_editor->get_viewport_control()->update();
	}
}

void CollisionPolygon2DEditor::_menu_option(int p_option) {

	switch (p_option) {

		case MODE_CREATE: {

			mode = MODE_CREATE;
			button_create->set_pressed(true);
			button_edit->set_pressed(false);
		} break;
		case MODE_EDIT: {

			mode = MODE_EDIT;
			button_create->set_pressed(false);
			button_edit->set_pressed(true);
		} break;
	}
}

void CollisionPolygon2DEditor::_wip_close() {

	undo_redo->create_action(TTR("Create Poly"));
	undo_redo->add_undo_method(node, "set_polygon", node->get_polygon());
	undo_redo->add_do_method(node, "set_polygon", wip);
	undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
	undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
	undo_redo->commit_action();
	wip.clear();
	wip_active = false;
	mode = MODE_EDIT;
	button_edit->set_pressed(true);
	button_create->set_pressed(false);
	edited_point = -1;
}

bool CollisionPolygon2DEditor::forward_gui_input(const InputEvent &p_event) {

	if (!node)
		return false;

	switch (p_event.type) {

		case InputEvent::MOUSE_BUTTON: {

			const InputEventMouseButton &mb = p_event.mouse_button;

			Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();

			Vector2 gpoint = Point2(mb.x, mb.y);
			Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
			cpoint = canvas_item_editor->snap_point(cpoint);
			cpoint = node->get_global_transform().affine_inverse().xform(cpoint);

			Vector<Vector2> poly = node->get_polygon();

			//first check if a point is to be added (segment split)
			real_t grab_treshold = EDITOR_DEF("editors/poly_editor/point_grab_radius", 8);

			switch (mode) {

				case MODE_CREATE: {

					if (mb.button_index == BUTTON_LEFT && mb.pressed) {

						if (!wip_active) {

							wip.clear();
							wip.push_back(cpoint);
							wip_active = true;
							edited_point_pos = cpoint;
							canvas_item_editor->get_viewport_control()->update();
							edited_point = 1;
							return true;
						} else {

							if (wip.size() > 1 && xform.xform(wip[0]).distance_to(gpoint) < grab_treshold) {
								//wip closed
								_wip_close();

								return true;
							} else {

								wip.push_back(cpoint);
								edited_point = wip.size();
								canvas_item_editor->get_viewport_control()->update();
								return true;

								//add wip point
							}
						}
					} else if (mb.button_index == BUTTON_RIGHT && mb.pressed && wip_active) {
						_wip_close();
					}

				} break;

				case MODE_EDIT: {

					if (mb.button_index == BUTTON_LEFT) {
						if (mb.pressed) {

							if (mb.mod.control) {

								if (poly.size() < 3) {

									undo_redo->create_action(TTR("Edit Poly"));
									undo_redo->add_undo_method(node, "set_polygon", poly);
									poly.push_back(cpoint);
									undo_redo->add_do_method(node, "set_polygon", poly);
									undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
									undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
									undo_redo->commit_action();
									return true;
								}

								//search edges
								int closest_idx = -1;
								Vector2 closest_pos;
								real_t closest_dist = 1e10;
								for (int i = 0; i < poly.size(); i++) {

									Vector2 points[2] = { xform.xform(poly[i]),
										xform.xform(poly[(i + 1) % poly.size()]) };

									Vector2 cp = Geometry::get_closest_point_to_segment_2d(gpoint, points);
									if (cp.distance_squared_to(points[0]) < CMP_EPSILON2 || cp.distance_squared_to(points[1]) < CMP_EPSILON2)
										continue; //not valid to reuse point

									real_t d = cp.distance_to(gpoint);
									if (d < closest_dist && d < grab_treshold) {
										closest_dist = d;
										closest_pos = cp;
										closest_idx = i;
									}
								}

								if (closest_idx >= 0) {

									pre_move_edit = poly;
									poly.insert(closest_idx + 1, xform.affine_inverse().xform(closest_pos));
									edited_point = closest_idx + 1;
									edited_point_pos = xform.affine_inverse().xform(closest_pos);
									node->set_polygon(poly);
									canvas_item_editor->get_viewport_control()->update();
									return true;
								}
							} else {

								//look for points to move

								int closest_idx = -1;
								Vector2 closest_pos;
								real_t closest_dist = 1e10;
								for (int i = 0; i < poly.size(); i++) {

									Vector2 cp = xform.xform(poly[i]);

									real_t d = cp.distance_to(gpoint);
									if (d < closest_dist && d < grab_treshold) {
										closest_dist = d;
										closest_pos = cp;
										closest_idx = i;
									}
								}

								if (closest_idx >= 0) {

									pre_move_edit = poly;
									edited_point = closest_idx;
									edited_point_pos = xform.affine_inverse().xform(closest_pos);
									canvas_item_editor->get_viewport_control()->update();
									return true;
								}
							}
						} else {

							if (edited_point != -1) {

								//apply

								ERR_FAIL_INDEX_V(edited_point, poly.size(), false);
								poly[edited_point] = edited_point_pos;
								undo_redo->create_action(TTR("Edit Poly"));
								undo_redo->add_do_method(node, "set_polygon", poly);
								undo_redo->add_undo_method(node, "set_polygon", pre_move_edit);
								undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
								undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
								undo_redo->commit_action();

								edited_point = -1;
								return true;
							}
						}
					} else if (mb.button_index == BUTTON_RIGHT && mb.pressed && edited_point == -1) {

						int closest_idx = -1;
						Vector2 closest_pos;
						real_t closest_dist = 1e10;
						for (int i = 0; i < poly.size(); i++) {

							Vector2 cp = xform.xform(poly[i]);

							real_t d = cp.distance_to(gpoint);
							if (d < closest_dist && d < grab_treshold) {
								closest_dist = d;
								closest_pos = cp;
								closest_idx = i;
							}
						}

						if (closest_idx >= 0) {

							undo_redo->create_action(TTR("Edit Poly (Remove Point)"));
							undo_redo->add_undo_method(node, "set_polygon", poly);
							poly.remove(closest_idx);
							undo_redo->add_do_method(node, "set_polygon", poly);
							undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
							undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
							undo_redo->commit_action();
							return true;
						}
					}

				} break;
			}

		} break;
		case InputEvent::MOUSE_MOTION: {

			const InputEventMouseMotion &mm = p_event.mouse_motion;

			if (edited_point != -1 && (wip_active || mm.button_mask & BUTTON_MASK_LEFT)) {

				Vector2 gpoint = Point2(mm.x, mm.y);
				Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
				cpoint = canvas_item_editor->snap_point(cpoint);
				edited_point_pos = node->get_global_transform().affine_inverse().xform(cpoint);

				canvas_item_editor->get_viewport_control()->update();
			}

		} break;
	}

	return false;
}
void CollisionPolygon2DEditor::_canvas_draw() {

	if (!node)
		return;

	Control *vpc = canvas_item_editor->get_viewport_control();

	Vector<Vector2> poly;

	if (wip_active)
		poly = wip;
	else
		poly = node->get_polygon();

	Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
	Ref<Texture> handle = get_icon("EditorHandle", "EditorIcons");

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

		Vector2 p, p2;
		p = i == edited_point ? edited_point_pos : poly[i];
		if ((wip_active && i == poly.size() - 1) || (((i + 1) % poly.size()) == edited_point))
			p2 = edited_point_pos;
		else
			p2 = poly[(i + 1) % poly.size()];

		Vector2 point = xform.xform(p);
		Vector2 next_point = xform.xform(p2);

		Color col = Color(1, 0.3, 0.1, 0.8);
		vpc->draw_line(point, next_point, col, 2);
		vpc->draw_texture(handle, point - handle->get_size() * 0.5);
	}
}

void CollisionPolygon2DEditor::edit(Node *p_collision_polygon) {

	if (!canvas_item_editor) {
		canvas_item_editor = CanvasItemEditor::get_singleton();
	}

	if (p_collision_polygon) {

		node = p_collision_polygon->cast_to<CollisionPolygon2D>();
		if (!canvas_item_editor->get_viewport_control()->is_connected("draw", this, "_canvas_draw"))
			canvas_item_editor->get_viewport_control()->connect("draw", this, "_canvas_draw");
		wip.clear();
		wip_active = false;
		edited_point = -1;
		canvas_item_editor->get_viewport_control()->update();

	} else {
		node = NULL;

		if (canvas_item_editor->get_viewport_control()->is_connected("draw", this, "_canvas_draw"))
			canvas_item_editor->get_viewport_control()->disconnect("draw", this, "_canvas_draw");
	}
}

void CollisionPolygon2DEditor::_bind_methods() {

	ClassDB::bind_method(D_METHOD("_menu_option"), &CollisionPolygon2DEditor::_menu_option);
	ClassDB::bind_method(D_METHOD("_canvas_draw"), &CollisionPolygon2DEditor::_canvas_draw);
	ClassDB::bind_method(D_METHOD("_node_removed"), &CollisionPolygon2DEditor::_node_removed);
}

CollisionPolygon2DEditor::CollisionPolygon2DEditor(EditorNode *p_editor) {

	node = NULL;
	canvas_item_editor = NULL;
	editor = p_editor;
	undo_redo = editor->get_undo_redo();

	add_child(memnew(VSeparator));
	button_create = memnew(ToolButton);
	add_child(button_create);
	button_create->connect("pressed", this, "_menu_option", varray(MODE_CREATE));
	button_create->set_toggle_mode(true);
	button_create->set_tooltip(TTR("Create a new polygon from scratch."));

	button_edit = memnew(ToolButton);
	add_child(button_edit);
	button_edit->connect("pressed", this, "_menu_option", varray(MODE_EDIT));
	button_edit->set_toggle_mode(true);
	button_edit->set_tooltip("Edit existing polygon:\nLMB: Move Point.\nCtrl+LMB: Split Segment.\nRMB: Erase Point.");

//add_constant_override("separation",0);

#if 0
	options = memnew( MenuButton );
	add_child(options);
	options->set_area_as_parent_rect();
	options->set_text("Polygon");
	//options->get_popup()->add_item("Parse BBCode",PARSE_BBCODE);
	options->get_popup()->connect("id_pressed", this,"_menu_option");
#endif

	mode = MODE_EDIT;
	wip_active = false;
}

void CollisionPolygon2DEditorPlugin::edit(Object *p_object) {

	collision_polygon_editor->edit(p_object->cast_to<Node>());
}

bool CollisionPolygon2DEditorPlugin::handles(Object *p_object) const {

	return p_object->is_class("CollisionPolygon2D");
}

void CollisionPolygon2DEditorPlugin::make_visible(bool p_visible) {

	if (p_visible) {
		collision_polygon_editor->show();
	} else {

		collision_polygon_editor->hide();
		collision_polygon_editor->edit(NULL);
	}
}

CollisionPolygon2DEditorPlugin::CollisionPolygon2DEditorPlugin(EditorNode *p_node) {

	editor = p_node;
	collision_polygon_editor = memnew(CollisionPolygon2DEditor(p_node));
	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(collision_polygon_editor);

	collision_polygon_editor->hide();
}

CollisionPolygon2DEditorPlugin::~CollisionPolygon2DEditorPlugin() {
}