/*
Copyright (c) 2020 Péter Magyar

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 "voxel_world_editor.h"

#include "core/version.h"

#include "editor/editor_scale.h"
#include "editor/editor_settings.h"

#include "voxel_world.h"

#include "core/os/keyboard.h"

#include "voxel_chunk.h"

#include "../library/voxel_surface.h"
#include "../library/voxel_library.h"

#include "../defines.h"

#include core_input_h
#include spatial_editor_plugin_h
#include camera_h

#if VERSION_MAJOR < 4
bool VoxelWorldEditor::forward_spatial_input_event(Camera *p_camera, const Ref<InputEvent> &p_event) {
	if (!_world || !_world->get_editable()) {
		return false;
	}

	Ref<InputEventMouseButton> mb = p_event;

	if (mb.is_valid()) {
		if (mb->is_pressed()) {
			Ref<VoxelLibrary> lib = _world->get_library();

			if (!lib.is_valid())
				return false;

			if (mb->get_button_index() == BUTTON_LEFT) {
				return do_input_action(p_camera, Point2(mb->get_position().x, mb->get_position().y), true);
			} else {
				return false;
			}

			//return do_input_action(p_camera, Point2(mb->get_position().x, mb->get_position().y), true);
		}
	}

	return false;
}
#else
EditorPlugin::AfterGUIInput VoxelWorldEditor::forward_spatial_input_event(Camera *p_camera, const Ref<InputEvent> &p_event) {
	if (!_world || !_world->get_editable()) {
		return EditorPlugin::AFTER_GUI_INPUT_PASS;
	}

	Ref<InputEventMouseButton> mb = p_event;

	if (mb.is_valid()) {
		if (mb->is_pressed()) {
			Ref<VoxelLibrary> lib = _world->get_library();

			if (!lib.is_valid())
				return EditorPlugin::AFTER_GUI_INPUT_PASS;

			if (mb->get_button_index() == MouseButton::LEFT) {
				if (do_input_action(p_camera, Point2(mb->get_position().x, mb->get_position().y), true)) {
					return EditorPlugin::AFTER_GUI_INPUT_STOP;
				} else {
					return EditorPlugin::AFTER_GUI_INPUT_PASS;
				}
			} else {
				return EditorPlugin::AFTER_GUI_INPUT_PASS;
			}

			//return do_input_action(p_camera, Point2(mb->get_position().x, mb->get_position().y), true);
		}
	}

	return EditorPlugin::AFTER_GUI_INPUT_PASS;
}

#endif

bool VoxelWorldEditor::do_input_action(Camera *p_camera, const Point2 &p_point, bool p_click) {
	if (!spatial_editor || !_world || !_world->is_inside_world())
		return false;

	Camera *camera = p_camera;
	Vector3 from = camera->project_ray_origin(p_point);
	Vector3 to = from + camera->project_ray_normal(p_point) * 10000;
	Transform local_xform = _world->get_global_transform().affine_inverse();

	from = local_xform.xform(from);
	to = local_xform.xform(to);

	PhysicsDirectSpaceState *ss = _world->GET_WORLD()->get_direct_space_state();

	PhysicsDirectSpaceState::RayResult res;

#if VERSION_MAJOR >= 4
	PhysicsDirectSpaceState::RayParameters keyparams;
	keyparams.from = from;
	keyparams.to = to;
#endif


#if VERSION_MAJOR < 4
	if (ss->intersect_ray(from, to, res)) {
#else
	if (ss->intersect_ray(keyparams, res)) {
#endif
		int selected_voxel = 0;
		int channel = 0;

		channel = _channel_type;

		if (channel == -1)
			return false;

		int isolevel = _current_isolevel;
		bool mode_add = false;

		if (_tool_mode == TOOL_MODE_ADD) {
			selected_voxel = _selected_type + 1;
			mode_add = true;
		} else if (_tool_mode == TOOL_MODE_REMOVE) {
			selected_voxel = 0;
			isolevel = 0;
			mode_add = false;
		}

		_world->set_voxel_with_tool(mode_add, res.position, res.normal, selected_voxel, isolevel);

		return true;
	}

	return false;
}

void VoxelWorldEditor::edit(VoxelWorld *p_world) {
	_world = p_world;

	if (!_world)
		return;

	_channel_type = _world->get_channel_index_info(VoxelWorld::CHANNEL_TYPE_INFO_TYPE);
	_channel_isolevel = _world->get_channel_index_info(VoxelWorld::CHANNEL_TYPE_INFO_ISOLEVEL);

	if (_channel_isolevel == -1) {
		_isolevel_slider->hide();
	} else {
		_isolevel_slider->show();
	}

	spatial_editor = Object::cast_to<SpatialEditorPlugin>(_editor->get_editor_plugin_screen());

	for (int i = 0; i < _surfaces_vbox_container->get_child_count(); ++i) {
		Node *child = _surfaces_vbox_container->get_child(i);

		if (!child->is_queued_for_deletion()) {
			child->queue_delete();
		}
	}

	Ref<VoxelLibrary> library = _world->get_library();

	if (!library.is_valid())
		return;

	if (!library->get_initialized())
		library->refresh_rects();

	bool f = false;
	for (int i = 0; i < library->voxel_surface_get_num(); ++i) {
		Ref<VoxelSurface> surface = library->voxel_surface_get(i);

		if (!surface.is_valid())
			continue;

		String text = String::num(i) + " - " + surface->get_name();

		Button *button = memnew(Button);
		button->set_text(text);
#if VERSION_MAJOR < 4
		button->set_text_align(Button::ALIGN_LEFT);
#else
		button->set_text_alignment(HorizontalAlignment::HORIZONTAL_ALIGNMENT_LEFT);
#endif
		button->set_meta("index", i);
		button->set_toggle_mode(true);
		button->set_button_group(_surfaces_button_group);
		button->set_h_size_flags(SIZE_EXPAND_FILL);

		button->CONNECT("button_up", this, VoxelWorldEditor, _on_surface_button_pressed);

		_surfaces_vbox_container->add_child(button);

		if (!f) {
			button->set_pressed(true);
			f = true;
		}
	}
}

VoxelWorldEditor::VoxelWorldEditor() {
	_world = NULL;
	_selected_type = 0;
	_channel_type = -1;
	_current_isolevel = 255;
	_channel_isolevel = -1;
	_editor = NULL;
	_tool_mode = TOOL_MODE_ADD;
}
VoxelWorldEditor::VoxelWorldEditor(EditorNode *p_editor) {
	_world = NULL;
	_selected_type = 0;
	_channel_type = -1;
	_current_isolevel = 255;
	_channel_isolevel = -1;

	_editor = p_editor;
	_tool_mode = TOOL_MODE_ADD;

	spatial_editor_hb = memnew(HBoxContainer);
	spatial_editor_hb->set_h_size_flags(SIZE_EXPAND_FILL);
#if VERSION_MAJOR < 4
	spatial_editor_hb->set_alignment(BoxContainer::ALIGN_BEGIN);
#else
	spatial_editor_hb->set_alignment(BoxContainer::ALIGNMENT_BEGIN);
#endif
	SpatialEditor::get_singleton()->add_control_to_menu_panel(spatial_editor_hb);

#if VERSION_MAJOR < 4
	_tool_button_group.instance();
#else
	_tool_button_group.instantiate();
#endif

	ToolButton *add_button = memnew(ToolButton);
	add_button->set_text("Add");
	add_button->set_toggle_mode(true);
	add_button->set_pressed(true);
	add_button->set_button_group(_tool_button_group);
	add_button->set_meta("tool_mode", TOOL_MODE_ADD);

	add_button->CONNECT("button_up", this, VoxelWorldEditor, _on_tool_button_pressed);

#if VERSION_MAJOR < 4
	add_button->set_shortcut(ED_SHORTCUT("voxel_world_editor/add_mode", "Add Mode", KEY_A));
#else
	add_button->set_shortcut(ED_SHORTCUT("voxel_world_editor/add_mode", "Add Mode", Key::A));
#endif

	spatial_editor_hb->add_child(add_button);

	ToolButton *remove_button = memnew(ToolButton);
	remove_button->set_text("Remove");
	remove_button->set_toggle_mode(true);
	remove_button->set_button_group(_tool_button_group);
	remove_button->set_meta("tool_mode", TOOL_MODE_REMOVE);

	remove_button->CONNECT("button_up", this, VoxelWorldEditor, _on_tool_button_pressed);

#if VERSION_MAJOR < 4
	remove_button->set_shortcut(ED_SHORTCUT("voxel_world_editor/remove_mode", "Remove Mode", KEY_S));
#else
	remove_button->set_shortcut(ED_SHORTCUT("voxel_world_editor/remove_mode", "Remove Mode", Key::S));
#endif

	spatial_editor_hb->add_child(remove_button);

	ToolButton *insert_buton = memnew(ToolButton);
	insert_buton->set_text("Insert");

	insert_buton->CONNECT("button_up", this, VoxelWorldEditor, _on_insert_block_at_camera_button_pressed);

#if VERSION_MAJOR < 4
	insert_buton->set_shortcut(ED_SHORTCUT("voxel_world_editor/instert_block_at_camera", "Insert at camera", KEY_B));
#else
	insert_buton->set_shortcut(ED_SHORTCUT("voxel_world_editor/instert_block_at_camera", "Insert at camera", Key::B));
#endif

	spatial_editor_hb->add_child(insert_buton);

	set_custom_minimum_size(Size2(200 * EDSCALE, 0));

	_isolevel_slider = memnew(HSlider);
	_isolevel_slider->set_min(1);
	_isolevel_slider->set_max(255);
	_isolevel_slider->set_value(_current_isolevel);
	_isolevel_slider->set_custom_minimum_size(Size2(50 * EDSCALE, 0));
	_isolevel_slider->set_v_size_flags(SIZE_EXPAND_FILL);
	spatial_editor_hb->add_child(_isolevel_slider);

	_isolevel_slider->CONNECT("value_changed", this, VoxelWorldEditor, _on_isolevel_slider_value_changed);

	_isolevel_slider->hide();

	ScrollContainer *scs = memnew(ScrollContainer);
	scs->set_h_size_flags(SIZE_EXPAND_FILL);
	scs->set_v_size_flags(SIZE_EXPAND_FILL);
	scs->set_name("Surfaces");
	add_child(scs);

	_surfaces_vbox_container = memnew(VBoxContainer);
	scs->add_child(_surfaces_vbox_container);
	_surfaces_vbox_container->set_h_size_flags(SIZE_EXPAND_FILL);

#if VERSION_MAJOR < 4
	_surfaces_button_group.instance();
#else
	_surfaces_button_group.instantiate();
#endif
}
VoxelWorldEditor::~VoxelWorldEditor() {
	_world = NULL;

	_surfaces_button_group.unref();
}

void VoxelWorldEditor::_node_removed(Node *p_node) {
	if (p_node == _world)
		_world = NULL;
}

void VoxelWorldEditor::_on_surface_button_pressed() {
	BaseButton *button = _surfaces_button_group->get_pressed_button();

	if (button) {
		_selected_type = button->get_meta("index");
	}
}

void VoxelWorldEditor::_on_tool_button_pressed() {
	BaseButton *button = _tool_button_group->get_pressed_button();

	if (button) {
		_tool_mode = static_cast<VoxelWorldEditorToolMode>(static_cast<int>(button->get_meta("tool_mode")));
	}
}

void VoxelWorldEditor::_on_insert_block_at_camera_button_pressed() {
	int selected_voxel = 0;
	int channel = 0;

	channel = _channel_type;

	if (channel == -1)
		return;

	SpatialEditorViewport *vp = SpatialEditor::get_singleton()->get_editor_viewport(0);

	if (!vp)
		return;


#if VERSION_MAJOR < 4
	Camera *cam = vp->get_camera();
#else
	Camera *cam = vp->get_camera_3d();
#endif

	if (!cam)
		return;

	Vector3 pos = cam->get_transform().origin;
	selected_voxel = _selected_type + 1;

	if (_channel_isolevel == -1) {
		_world->set_voxel_at_world_position(pos, selected_voxel, channel);
	} else {
		_world->set_voxel_at_world_position(pos, selected_voxel, channel, false);
		_world->set_voxel_at_world_position(pos, _current_isolevel, _channel_isolevel);
	}
}

void VoxelWorldEditor::_on_isolevel_slider_value_changed(float value) {
	_current_isolevel = value;
}

void VoxelWorldEditor::_bind_methods() {
	ClassDB::bind_method("_node_removed", &VoxelWorldEditor::_node_removed);
	ClassDB::bind_method("_on_surface_button_pressed", &VoxelWorldEditor::_on_surface_button_pressed);
	ClassDB::bind_method("_on_tool_button_pressed", &VoxelWorldEditor::_on_tool_button_pressed);
	ClassDB::bind_method("_on_insert_block_at_camera_button_pressed", &VoxelWorldEditor::_on_insert_block_at_camera_button_pressed);
	ClassDB::bind_method("_on_isolevel_slider_value_changed", &VoxelWorldEditor::_on_isolevel_slider_value_changed);
}

void VoxelWorldEditorPlugin::_notification(int p_what) {
	if (p_what == EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED) {
		switch ((int)EditorSettings::get_singleton()->get("editors/voxel/editor_side")) {
#if VERSION_MAJOR <= 3 && VERSION_MINOR < 5
			case 0: { // Left.
				SpatialEditor::get_singleton()->get_palette_split()->move_child(voxel_world_editor, 0);
			} break;
			case 1: { // Right.
				SpatialEditor::get_singleton()->get_palette_split()->move_child(voxel_world_editor, 1);
			} break;
#else
			case 0: { // Left.
				SpatialEditor::get_singleton()->move_control_to_left_panel(voxel_world_editor);
			} break;
			case 1: { // Right.
				SpatialEditor::get_singleton()->move_control_to_right_panel(voxel_world_editor);
			} break;
#endif
		}
	}
}

void VoxelWorldEditorPlugin::edit(Object *p_object) {
	voxel_world_editor->edit(Object::cast_to<VoxelWorld>(p_object));
}

bool VoxelWorldEditorPlugin::handles(Object *p_object) const {
	if (!p_object->is_class("VoxelWorld"))
		return false;

	VoxelWorld *w = Object::cast_to<VoxelWorld>(p_object);

	return w->get_editable();
}

void VoxelWorldEditorPlugin::make_visible(bool p_visible) {
	if (p_visible) {
		voxel_world_editor->show();
		voxel_world_editor->spatial_editor_hb->show();
		voxel_world_editor->set_process(true);
	} else {
		voxel_world_editor->spatial_editor_hb->hide();
		voxel_world_editor->hide();
		voxel_world_editor->edit(NULL);
		voxel_world_editor->set_process(false);
	}
}

VoxelWorldEditorPlugin::VoxelWorldEditorPlugin(EditorNode *p_node) {
	editor = p_node;

	EDITOR_DEF("editors/voxel/editor_side", 1);
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "editors/voxel/editor_side", PROPERTY_HINT_ENUM, "Left,Right"));

	voxel_world_editor = memnew(VoxelWorldEditor(editor));
	switch ((int)EditorSettings::get_singleton()->get("editors/voxel/editor_side")) {
		case 0: { // Left.
			add_control_to_container(CONTAINER_SPATIAL_EDITOR_SIDE_LEFT, voxel_world_editor);
		} break;
		case 1: { // Right.
			add_control_to_container(CONTAINER_SPATIAL_EDITOR_SIDE_RIGHT, voxel_world_editor);
		} break;
	}
	voxel_world_editor->hide();
}

VoxelWorldEditorPlugin::~VoxelWorldEditorPlugin() {
}