/**************************************************************************/
/*  editor_dock_manager.cpp                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 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 "editor_dock_manager.h"

#include "scene/gui/box_container.h"
#include "scene/gui/button.h"
#include "scene/gui/label.h"
#include "scene/gui/popup.h"
#include "scene/gui/split_container.h"
#include "scene/gui/tab_container.h"
#include "scene/main/window.h"

#include "editor/editor_command_palette.h"
#include "editor/editor_node.h"
#include "editor/editor_settings.h"
#include "editor/editor_string_names.h"
#include "editor/filesystem_dock.h"
#include "editor/gui/editor_bottom_panel.h"
#include "editor/themes/editor_scale.h"
#include "editor/window_wrapper.h"

EditorDockManager *EditorDockManager::singleton = nullptr;

void DockSplitContainer::_update_visibility() {
	if (is_updating) {
		return;
	}
	is_updating = true;
	bool any_visible = false;
	for (int i = 0; i < 2; i++) {
		Control *split = get_containable_child(i);
		if (split && split->is_visible()) {
			any_visible = true;
			break;
		}
	}
	set_visible(any_visible);
	is_updating = false;
}

void DockSplitContainer::add_child_notify(Node *p_child) {
	SplitContainer::add_child_notify(p_child);

	Control *child_control = nullptr;
	for (int i = 0; i < 2; i++) {
		Control *split = get_containable_child(i);
		if (p_child == split) {
			child_control = split;
			break;
		}
	}
	if (!child_control) {
		return;
	}

	child_control->connect("visibility_changed", callable_mp(this, &DockSplitContainer::_update_visibility));
	_update_visibility();
}

void DockSplitContainer::remove_child_notify(Node *p_child) {
	SplitContainer::remove_child_notify(p_child);

	Control *child_control = nullptr;
	for (int i = 0; i < 2; i++) {
		Control *split = get_containable_child(i);
		if (p_child == split) {
			child_control = split;
			break;
		}
	}
	if (!child_control) {
		return;
	}

	child_control->disconnect("visibility_changed", callable_mp(this, &DockSplitContainer::_update_visibility));
	_update_visibility();
}

void EditorDockManager::_dock_split_dragged(int p_offset) {
	EditorNode::get_singleton()->save_editor_layout_delayed();
}

void EditorDockManager::_dock_container_gui_input(const Ref<InputEvent> &p_input, TabContainer *p_dock_container) {
	Ref<InputEventMouseButton> mb = p_input;

	if (mb.is_valid() && mb->get_button_index() == MouseButton::RIGHT && mb->is_pressed()) {
		int tab_id = p_dock_container->get_tab_bar()->get_hovered_tab();
		if (tab_id < 0) {
			return;
		}

		// Right click context menu.
		dock_context_popup->set_dock(p_dock_container->get_tab_control(tab_id));
		dock_context_popup->set_position(p_dock_container->get_screen_position() + mb->get_position());
		dock_context_popup->popup();
	}
}

void EditorDockManager::_bottom_dock_button_gui_input(const Ref<InputEvent> &p_input, Control *p_dock, Button *p_bottom_button) {
	Ref<InputEventMouseButton> mb = p_input;

	if (mb.is_valid() && mb->get_button_index() == MouseButton::RIGHT && mb->is_pressed()) {
		// Right click context menu.
		dock_context_popup->set_dock(p_dock);
		dock_context_popup->set_position(p_bottom_button->get_screen_position() + mb->get_position());
		dock_context_popup->popup();
	}
}

void EditorDockManager::_dock_container_update_visibility(TabContainer *p_dock_container) {
	if (!docks_visible) {
		return;
	}
	// Hide the dock container if there are no tabs.
	p_dock_container->set_visible(p_dock_container->get_tab_count() > 0);
}

void EditorDockManager::_update_layout() {
	if (!dock_context_popup->is_inside_tree() || EditorNode::get_singleton()->is_exiting()) {
		return;
	}
	dock_context_popup->docks_updated();
	_update_docks_menu();
	EditorNode::get_singleton()->save_editor_layout_delayed();
}

void EditorDockManager::_update_docks_menu() {
	docks_menu->clear();
	docks_menu->reset_size();

	const Ref<Texture2D> icon = docks_menu->get_editor_theme_icon(SNAME("Window"));
	const Color closed_icon_color_mod = Color(1, 1, 1, 0.5);

	// Add docks.
	docks_menu_docks.clear();
	int id = 0;
	for (const KeyValue<Control *, DockInfo> &dock : all_docks) {
		if (dock.value.shortcut.is_valid()) {
			docks_menu->add_shortcut(dock.value.shortcut, id);
			docks_menu->set_item_text(id, dock.value.title);
		} else {
			docks_menu->add_item(dock.value.title, id);
		}
		docks_menu->set_item_icon(id, icon);
		if (!dock.value.open) {
			docks_menu->set_item_icon_modulate(id, closed_icon_color_mod);
		}
		docks_menu->set_item_disabled(id, !dock.value.enabled);
		docks_menu_docks.push_back(dock.key);
		id++;
	}
}

void EditorDockManager::_docks_menu_option(int p_id) {
	focus_dock(docks_menu_docks[p_id]);
}

void EditorDockManager::_window_close_request(WindowWrapper *p_wrapper) {
	// Give the dock back to the original owner.
	Control *dock = _close_window(p_wrapper);
	ERR_FAIL_COND(!all_docks.has(dock));

	if (all_docks[dock].previous_at_bottom || all_docks[dock].dock_slot_index != DOCK_SLOT_NONE) {
		all_docks[dock].open = false;
		open_dock(dock);
		focus_dock(dock);
	} else {
		close_dock(dock);
	}
}

Control *EditorDockManager::_close_window(WindowWrapper *p_wrapper) {
	p_wrapper->set_block_signals(true);
	Control *dock = p_wrapper->release_wrapped_control();
	p_wrapper->set_block_signals(false);
	ERR_FAIL_COND_V(!all_docks.has(dock), nullptr);

	all_docks[dock].dock_window = nullptr;
	dock_windows.erase(p_wrapper);
	p_wrapper->queue_free();
	return dock;
}

void EditorDockManager::_open_dock_in_window(Control *p_dock, bool p_show_window, bool p_reset_size) {
	ERR_FAIL_NULL(p_dock);

	Size2 borders = Size2(4, 4) * EDSCALE;
	// Remember size and position before removing it from the main window.
	Size2 dock_size = p_dock->get_size() + borders * 2;
	Point2 dock_screen_pos = p_dock->get_screen_position();

	WindowWrapper *wrapper = memnew(WindowWrapper);
	wrapper->set_window_title(vformat(TTR("%s - Godot Engine"), all_docks[p_dock].title));
	wrapper->set_margins_enabled(true);

	EditorNode::get_singleton()->get_gui_base()->add_child(wrapper);

	_move_dock(p_dock, nullptr);
	wrapper->set_wrapped_control(p_dock);

	all_docks[p_dock].dock_window = wrapper;
	all_docks[p_dock].open = true;
	p_dock->show();

	wrapper->connect("window_close_requested", callable_mp(this, &EditorDockManager::_window_close_request).bind(wrapper));
	dock_windows.push_back(wrapper);

	if (p_show_window) {
		wrapper->restore_window(Rect2i(dock_screen_pos, dock_size), EditorNode::get_singleton()->get_gui_base()->get_window()->get_current_screen());
		_update_layout();
		if (p_reset_size) {
			// Use a default size of one third the current window size.
			Size2i popup_size = EditorNode::get_singleton()->get_window()->get_size() / 3.0;
			p_dock->get_window()->set_size(popup_size);
			p_dock->get_window()->move_to_center();
		}
		p_dock->get_window()->grab_focus();
	}
}

void EditorDockManager::_restore_dock_to_saved_window(Control *p_dock, const Dictionary &p_window_dump) {
	if (!all_docks[p_dock].dock_window) {
		_open_dock_in_window(p_dock, false);
	}

	all_docks[p_dock].dock_window->restore_window_from_saved_position(
			p_window_dump.get("window_rect", Rect2i()),
			p_window_dump.get("window_screen", -1),
			p_window_dump.get("window_screen_rect", Rect2i()));
}

void EditorDockManager::_dock_move_to_bottom(Control *p_dock) {
	_move_dock(p_dock, nullptr);

	all_docks[p_dock].at_bottom = true;
	all_docks[p_dock].previous_at_bottom = false;

	p_dock->call("_set_dock_horizontal", true);

	// Force docks moved to the bottom to appear first in the list, and give them their associated shortcut to toggle their bottom panel.
	Button *bottom_button = EditorNode::get_bottom_panel()->add_item(all_docks[p_dock].title, p_dock, all_docks[p_dock].shortcut, true);
	bottom_button->connect("gui_input", callable_mp(this, &EditorDockManager::_bottom_dock_button_gui_input).bind(bottom_button).bind(p_dock));
	EditorNode::get_bottom_panel()->make_item_visible(p_dock);
}

void EditorDockManager::_dock_remove_from_bottom(Control *p_dock) {
	all_docks[p_dock].at_bottom = false;
	all_docks[p_dock].previous_at_bottom = true;

	EditorNode::get_bottom_panel()->remove_item(p_dock);
	p_dock->call("_set_dock_horizontal", false);
}

bool EditorDockManager::_is_dock_at_bottom(Control *p_dock) {
	ERR_FAIL_COND_V(!all_docks.has(p_dock), false);
	return all_docks[p_dock].at_bottom;
}

void EditorDockManager::_move_dock_tab_index(Control *p_dock, int p_tab_index, bool p_set_current) {
	TabContainer *dock_tab_container = Object::cast_to<TabContainer>(p_dock->get_parent());
	if (!dock_tab_container) {
		return;
	}

	dock_tab_container->set_block_signals(true);
	int target_index = CLAMP(p_tab_index, 0, dock_tab_container->get_tab_count() - 1);
	dock_tab_container->move_child(p_dock, dock_tab_container->get_tab_control(target_index)->get_index(false));
	all_docks[p_dock].previous_tab_index = target_index;

	if (p_set_current) {
		dock_tab_container->set_current_tab(target_index);
	}
	dock_tab_container->set_block_signals(false);
}

void EditorDockManager::_move_dock(Control *p_dock, Control *p_target, int p_tab_index, bool p_set_current) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot move unknown dock '%s'.", p_dock->get_name()));

	Node *parent = p_dock->get_parent();
	if (parent == p_target) {
		if (p_tab_index >= 0 && parent) {
			// Only change the tab index.
			_move_dock_tab_index(p_dock, p_tab_index, p_set_current);
		}
		return;
	}

	// Remove dock from its existing parent.
	if (parent) {
		if (all_docks[p_dock].dock_window) {
			_close_window(all_docks[p_dock].dock_window);
		} else if (all_docks[p_dock].at_bottom) {
			_dock_remove_from_bottom(p_dock);
		} else {
			all_docks[p_dock].previous_at_bottom = false;
			TabContainer *parent_tabs = Object::cast_to<TabContainer>(parent);
			if (parent_tabs) {
				all_docks[p_dock].previous_tab_index = parent_tabs->get_tab_idx_from_control(p_dock);
			}
			parent->set_block_signals(true);
			parent->remove_child(p_dock);
			parent->set_block_signals(false);
			if (parent_tabs) {
				_dock_container_update_visibility(parent_tabs);
			}
		}
	}

	// Add dock to its new parent, at the given tab index.
	if (!p_target) {
		return;
	}
	p_target->set_block_signals(true);
	p_target->add_child(p_dock);
	p_target->set_block_signals(false);
	TabContainer *dock_tab_container = Object::cast_to<TabContainer>(p_target);
	if (dock_tab_container) {
		dock_tab_container->set_tab_title(dock_tab_container->get_tab_idx_from_control(p_dock), all_docks[p_dock].title);
		if (p_tab_index >= 0) {
			_move_dock_tab_index(p_dock, p_tab_index, p_set_current);
		}
		_dock_container_update_visibility(dock_tab_container);
	}
}

void EditorDockManager::save_docks_to_config(Ref<ConfigFile> p_layout, const String &p_section) const {
	// Save docks by dock slot.
	for (int i = 0; i < DOCK_SLOT_MAX; i++) {
		String names;
		for (int j = 0; j < dock_slot[i]->get_tab_count(); j++) {
			String name = dock_slot[i]->get_tab_control(j)->get_name();
			if (!names.is_empty()) {
				names += ",";
			}
			names += name;
		}

		String config_key = "dock_" + itos(i + 1);

		if (p_layout->has_section_key(p_section, config_key)) {
			p_layout->erase_section_key(p_section, config_key);
		}

		if (!names.is_empty()) {
			p_layout->set_value(p_section, config_key, names);
		}

		int selected_tab_idx = dock_slot[i]->get_current_tab();
		if (selected_tab_idx >= 0) {
			p_layout->set_value(p_section, "dock_" + itos(i + 1) + "_selected_tab_idx", selected_tab_idx);
		}
	}
	if (p_layout->has_section_key(p_section, "dock_0")) {
		// Clear the keys where the dock has no slot so it is overridden.
		p_layout->erase_section_key(p_section, "dock_0");
	}

	// Save docks in windows.
	Dictionary floating_docks_dump;
	for (WindowWrapper *wrapper : dock_windows) {
		Control *dock = wrapper->get_wrapped_control();

		Dictionary window_dump;
		window_dump["window_rect"] = wrapper->get_window_rect();

		int screen = wrapper->get_window_screen();
		window_dump["window_screen"] = wrapper->get_window_screen();
		window_dump["window_screen_rect"] = DisplayServer::get_singleton()->screen_get_usable_rect(screen);

		String name = dock->get_name();
		floating_docks_dump[name] = window_dump;

		// Append to regular dock section so we know where to restore it to.
		int dock_slot_id = all_docks[dock].dock_slot_index;
		String config_key = "dock_" + itos(dock_slot_id + 1);

		String names = p_layout->get_value(p_section, config_key, "");
		if (names.is_empty()) {
			names = name;
		} else {
			names += "," + name;
		}
		p_layout->set_value(p_section, config_key, names);
	}
	p_layout->set_value(p_section, "dock_floating", floating_docks_dump);

	// Save closed and bottom docks.
	Array bottom_docks_dump;
	Array closed_docks_dump;
	for (const KeyValue<Control *, DockInfo> &d : all_docks) {
		if (!d.value.at_bottom && d.value.open && (!d.value.previous_at_bottom || !d.value.dock_window)) {
			continue;
		}
		// Use the name of the Control since it isn't translated.
		String name = d.key->get_name();
		if (d.value.at_bottom || (d.value.previous_at_bottom && d.value.dock_window)) {
			bottom_docks_dump.push_back(name);
		}
		if (!d.value.open) {
			closed_docks_dump.push_back(name);
		}

		int dock_slot_id = all_docks[d.key].dock_slot_index;
		String config_key = "dock_" + itos(dock_slot_id + 1);

		String names = p_layout->get_value(p_section, config_key, "");
		if (names.is_empty()) {
			names = name;
		} else {
			names += "," + name;
		}
		p_layout->set_value(p_section, config_key, names);
	}
	p_layout->set_value(p_section, "dock_bottom", bottom_docks_dump);
	p_layout->set_value(p_section, "dock_closed", closed_docks_dump);

	// Save SplitContainer offsets.
	for (int i = 0; i < vsplits.size(); i++) {
		if (vsplits[i]->is_visible_in_tree()) {
			p_layout->set_value(p_section, "dock_split_" + itos(i + 1), vsplits[i]->get_split_offset());
		}
	}

	for (int i = 0; i < hsplits.size(); i++) {
		p_layout->set_value(p_section, "dock_hsplit_" + itos(i + 1), hsplits[i]->get_split_offset());
	}

	FileSystemDock::get_singleton()->save_layout_to_config(p_layout, p_section);
}

void EditorDockManager::load_docks_from_config(Ref<ConfigFile> p_layout, const String &p_section) {
	Dictionary floating_docks_dump = p_layout->get_value(p_section, "dock_floating", Dictionary());
	Array dock_bottom = p_layout->get_value(p_section, "dock_bottom", Array());
	Array closed_docks = p_layout->get_value(p_section, "dock_closed", Array());

	bool restore_window_on_load = EDITOR_GET("interface/multi_window/restore_windows_on_load");

	// Store the docks by name for easy lookup.
	HashMap<String, Control *> dock_map;
	for (const KeyValue<Control *, DockInfo> &dock : all_docks) {
		dock_map[dock.key->get_name()] = dock.key;
	}

	// Load docks by slot. Index -1 is for docks that have no slot.
	for (int i = -1; i < DOCK_SLOT_MAX; i++) {
		if (!p_layout->has_section_key(p_section, "dock_" + itos(i + 1))) {
			continue;
		}

		Vector<String> names = String(p_layout->get_value(p_section, "dock_" + itos(i + 1))).split(",");

		for (int j = names.size() - 1; j >= 0; j--) {
			String name = names[j];

			if (!dock_map.has(name)) {
				continue;
			}
			Control *dock = dock_map[name];

			if (!all_docks[dock].enabled) {
				// Don't open disabled docks.
				continue;
			}
			if (restore_window_on_load && floating_docks_dump.has(name)) {
				all_docks[dock].previous_at_bottom = dock_bottom.has(name);
				_restore_dock_to_saved_window(dock, floating_docks_dump[name]);
			} else if (dock_bottom.has(name)) {
				_dock_move_to_bottom(dock);
			} else if (i >= 0) {
				_move_dock(dock, dock_slot[i], 0);
			}

			if (closed_docks.has(name)) {
				_move_dock(dock, closed_dock_parent);
				all_docks[dock].open = false;
				dock->hide();
			} else {
				// Make sure it is open.
				all_docks[dock].open = true;
				dock->show();
			}

			all_docks[dock].dock_slot_index = i;
			all_docks[dock].previous_tab_index = i >= 0 ? j : 0;
		}
	}

	// Set the selected tabs.
	for (int i = 0; i < DOCK_SLOT_MAX; i++) {
		if (dock_slot[i]->get_tab_count() == 0 || !p_layout->has_section_key(p_section, "dock_" + itos(i + 1) + "_selected_tab_idx")) {
			continue;
		}
		int selected_tab_idx = p_layout->get_value(p_section, "dock_" + itos(i + 1) + "_selected_tab_idx");
		if (selected_tab_idx >= 0 && selected_tab_idx < dock_slot[i]->get_tab_count()) {
			dock_slot[i]->set_block_signals(true);
			dock_slot[i]->set_current_tab(selected_tab_idx);
			dock_slot[i]->set_block_signals(false);
		}
	}

	// Load SplitContainer offsets.
	for (int i = 0; i < vsplits.size(); i++) {
		if (!p_layout->has_section_key(p_section, "dock_split_" + itos(i + 1))) {
			continue;
		}
		int ofs = p_layout->get_value(p_section, "dock_split_" + itos(i + 1));
		vsplits[i]->set_split_offset(ofs);
	}

	for (int i = 0; i < hsplits.size(); i++) {
		if (!p_layout->has_section_key(p_section, "dock_hsplit_" + itos(i + 1))) {
			continue;
		}
		int ofs = p_layout->get_value(p_section, "dock_hsplit_" + itos(i + 1));
		hsplits[i]->set_split_offset(ofs);
	}

	FileSystemDock::get_singleton()->load_layout_from_config(p_layout, p_section);

	_update_docks_menu();
}

void EditorDockManager::bottom_dock_show_placement_popup(const Rect2i &p_position, Control *p_dock) {
	ERR_FAIL_COND(!all_docks.has(p_dock));

	dock_context_popup->set_dock(p_dock);

	Vector2 popup_pos = p_position.position;
	popup_pos.y += p_position.size.height;

	if (!EditorNode::get_singleton()->get_gui_base()->is_layout_rtl()) {
		popup_pos.x -= dock_context_popup->get_size().width;
		popup_pos.x += p_position.size.width;
	}
	dock_context_popup->set_position(popup_pos);
	dock_context_popup->popup();
}

void EditorDockManager::set_dock_enabled(Control *p_dock, bool p_enabled) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot set enabled unknown dock '%s'.", p_dock->get_name()));

	if (all_docks[p_dock].enabled == p_enabled) {
		return;
	}

	all_docks[p_dock].enabled = p_enabled;
	if (p_enabled) {
		open_dock(p_dock, false);
	} else {
		close_dock(p_dock);
	}
}

void EditorDockManager::close_dock(Control *p_dock) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot close unknown dock '%s'.", p_dock->get_name()));

	if (!all_docks[p_dock].open) {
		return;
	}

	_move_dock(p_dock, closed_dock_parent);

	all_docks[p_dock].open = false;
	p_dock->hide();

	_update_layout();
}

void EditorDockManager::open_dock(Control *p_dock, bool p_set_current) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot open unknown dock '%s'.", p_dock->get_name()));

	if (all_docks[p_dock].open) {
		return;
	}

	all_docks[p_dock].open = true;
	p_dock->show();

	// Open dock to its previous location.
	if (all_docks[p_dock].previous_at_bottom) {
		_dock_move_to_bottom(p_dock);
	} else if (all_docks[p_dock].dock_slot_index != DOCK_SLOT_NONE) {
		TabContainer *slot = dock_slot[all_docks[p_dock].dock_slot_index];
		int tab_index = all_docks[p_dock].previous_tab_index;
		if (tab_index < 0) {
			tab_index = slot->get_tab_count();
		}
		_move_dock(p_dock, slot, tab_index, p_set_current);
	} else {
		_open_dock_in_window(p_dock, true, true);
		return;
	}

	_update_layout();
}

TabContainer *EditorDockManager::get_dock_tab_container(Control *p_dock) const {
	return Object::cast_to<TabContainer>(p_dock->get_parent());
}

void EditorDockManager::focus_dock(Control *p_dock) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot focus unknown dock '%s'.", p_dock->get_name()));

	if (!all_docks[p_dock].enabled) {
		return;
	}

	if (!all_docks[p_dock].open) {
		open_dock(p_dock);
	}

	if (all_docks[p_dock].dock_window) {
		p_dock->get_window()->grab_focus();
		return;
	}

	if (all_docks[p_dock].at_bottom) {
		EditorNode::get_bottom_panel()->make_item_visible(p_dock);
		return;
	}

	if (!docks_visible) {
		return;
	}

	TabContainer *tab_container = get_dock_tab_container(p_dock);
	if (!tab_container) {
		return;
	}
	int tab_index = tab_container->get_tab_idx_from_control(p_dock);
	tab_container->get_tab_bar()->grab_focus();
	tab_container->set_current_tab(tab_index);
}

void EditorDockManager::add_dock(Control *p_dock, const String &p_title, DockSlot p_slot, const Ref<Shortcut> &p_shortcut) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(all_docks.has(p_dock), vformat("Cannot add dock '%s', already added.", p_dock->get_name()));

	DockInfo dock_info;
	dock_info.title = !p_title.is_empty() ? p_title : String(p_dock->get_name());
	dock_info.dock_slot_index = p_slot;
	dock_info.shortcut = p_shortcut;
	all_docks[p_dock] = dock_info;

	if (p_slot != DOCK_SLOT_NONE) {
		ERR_FAIL_INDEX(p_slot, DOCK_SLOT_MAX);
		open_dock(p_dock, false);
	} else {
		closed_dock_parent->add_child(p_dock);
		p_dock->hide();
		_update_layout();
	}
}

void EditorDockManager::remove_dock(Control *p_dock) {
	ERR_FAIL_NULL(p_dock);
	ERR_FAIL_COND_MSG(!all_docks.has(p_dock), vformat("Cannot remove unknown dock '%s'.", p_dock->get_name()));

	_move_dock(p_dock, nullptr);

	all_docks.erase(p_dock);
	_update_layout();
}

void EditorDockManager::set_docks_visible(bool p_show) {
	if (docks_visible == p_show) {
		return;
	}
	docks_visible = p_show;
	for (int i = 0; i < DOCK_SLOT_MAX; i++) {
		dock_slot[i]->set_visible(docks_visible && dock_slot[i]->get_tab_count() > 0);
	}
	_update_layout();
}

bool EditorDockManager::are_docks_visible() const {
	return docks_visible;
}

void EditorDockManager::add_vsplit(DockSplitContainer *p_split) {
	vsplits.push_back(p_split);
	p_split->connect("dragged", callable_mp(this, &EditorDockManager::_dock_split_dragged));
}

void EditorDockManager::add_hsplit(DockSplitContainer *p_split) {
	hsplits.push_back(p_split);
	p_split->connect("dragged", callable_mp(this, &EditorDockManager::_dock_split_dragged));
}

void EditorDockManager::register_dock_slot(DockSlot p_dock_slot, TabContainer *p_tab_container) {
	ERR_FAIL_NULL(p_tab_container);
	ERR_FAIL_INDEX(p_dock_slot, DOCK_SLOT_MAX);

	dock_slot[p_dock_slot] = p_tab_container;

	p_tab_container->set_custom_minimum_size(Size2(170, 0) * EDSCALE);
	p_tab_container->set_v_size_flags(Control::SIZE_EXPAND_FILL);
	p_tab_container->set_popup(dock_context_popup);
	p_tab_container->connect("pre_popup_pressed", callable_mp(dock_context_popup, &DockContextPopup::select_current_dock_in_dock_slot).bind(p_dock_slot));
	p_tab_container->set_drag_to_rearrange_enabled(true);
	p_tab_container->set_tabs_rearrange_group(1);
	p_tab_container->connect("tab_changed", callable_mp(this, &EditorDockManager::_update_layout).unbind(1));
	p_tab_container->connect("active_tab_rearranged", callable_mp(this, &EditorDockManager::_update_layout).unbind(1));
	p_tab_container->connect("child_order_changed", callable_mp(this, &EditorDockManager::_dock_container_update_visibility).bind(p_tab_container));
	p_tab_container->set_use_hidden_tabs_for_min_size(true);
	p_tab_container->get_tab_bar()->connect("gui_input", callable_mp(this, &EditorDockManager::_dock_container_gui_input).bind(p_tab_container));
	p_tab_container->hide();
}

int EditorDockManager::get_vsplit_count() const {
	return vsplits.size();
}

PopupMenu *EditorDockManager::get_docks_menu() {
	return docks_menu;
}

EditorDockManager::EditorDockManager() {
	singleton = this;

	closed_dock_parent = EditorNode::get_singleton()->get_gui_base();

	dock_context_popup = memnew(DockContextPopup);
	EditorNode::get_singleton()->get_gui_base()->add_child(dock_context_popup);

	docks_menu = memnew(PopupMenu);
	docks_menu->connect("id_pressed", callable_mp(this, &EditorDockManager::_docks_menu_option));
	EditorNode::get_singleton()->get_gui_base()->connect("theme_changed", callable_mp(this, &EditorDockManager::_update_docks_menu));
}

void DockContextPopup::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			if (make_float_button) {
				make_float_button->set_icon(get_editor_theme_icon(SNAME("MakeFloating")));
			}
			if (is_layout_rtl()) {
				tab_move_left_button->set_icon(get_editor_theme_icon(SNAME("Forward")));
				tab_move_right_button->set_icon(get_editor_theme_icon(SNAME("Back")));
				tab_move_left_button->set_tooltip_text(TTR("Move this dock right one tab."));
				tab_move_right_button->set_tooltip_text(TTR("Move this dock left one tab."));
			} else {
				tab_move_left_button->set_icon(get_editor_theme_icon(SNAME("Back")));
				tab_move_right_button->set_icon(get_editor_theme_icon(SNAME("Forward")));
				tab_move_left_button->set_tooltip_text(TTR("Move this dock left one tab."));
				tab_move_right_button->set_tooltip_text(TTR("Move this dock right one tab."));
			}
			dock_to_bottom_button->set_icon(get_editor_theme_icon(SNAME("ControlAlignBottomWide")));
			close_button->set_icon(get_editor_theme_icon(SNAME("Close")));
		} break;
	}
}

void DockContextPopup::_tab_move_left() {
	TabContainer *tab_container = dock_manager->get_dock_tab_container(context_dock);
	if (!tab_container) {
		return;
	}
	int new_index = tab_container->get_tab_idx_from_control(context_dock) - 1;
	dock_manager->_move_dock(context_dock, tab_container, new_index);
	dock_manager->_update_layout();
	dock_select->queue_redraw();
}

void DockContextPopup::_tab_move_right() {
	TabContainer *tab_container = dock_manager->get_dock_tab_container(context_dock);
	if (!tab_container) {
		return;
	}
	int new_index = tab_container->get_tab_idx_from_control(context_dock) + 1;
	dock_manager->_move_dock(context_dock, tab_container, new_index);
	dock_manager->_update_layout();
	dock_select->queue_redraw();
}

void DockContextPopup::_close_dock() {
	hide();
	dock_manager->close_dock(context_dock);
}

void DockContextPopup::_float_dock() {
	hide();
	dock_manager->_open_dock_in_window(context_dock);
}

void DockContextPopup::_move_dock_to_bottom() {
	hide();
	dock_manager->_dock_move_to_bottom(context_dock);
	dock_manager->_update_layout();
}

void DockContextPopup::_dock_select_input(const Ref<InputEvent> &p_input) {
	Ref<InputEventMouse> me = p_input;

	if (me.is_valid()) {
		Vector2 point = me->get_position();

		int over_dock_slot = -1;
		for (int i = 0; i < EditorDockManager::DOCK_SLOT_MAX; i++) {
			if (dock_select_rects[i].has_point(point)) {
				over_dock_slot = i;
				break;
			}
		}

		if (over_dock_slot != dock_select_rect_over_idx) {
			dock_select->queue_redraw();
			dock_select_rect_over_idx = over_dock_slot;
		}

		if (over_dock_slot == -1) {
			return;
		}

		Ref<InputEventMouseButton> mb = me;
		TabContainer *target_tab_container = dock_manager->dock_slot[over_dock_slot];

		if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT && mb->is_pressed()) {
			if (dock_manager->get_dock_tab_container(context_dock) != target_tab_container) {
				dock_manager->_move_dock(context_dock, target_tab_container, target_tab_container->get_tab_count());
				dock_manager->all_docks[context_dock].dock_slot_index = over_dock_slot;
				dock_manager->_update_layout();
				hide();
			}
		}
	}
}

void DockContextPopup::_dock_select_mouse_exited() {
	dock_select_rect_over_idx = -1;
	dock_select->queue_redraw();
}

void DockContextPopup::_dock_select_draw() {
	Color used_dock_color = Color(0.6, 0.6, 0.6, 0.8);
	Color hovered_dock_color = Color(0.8, 0.8, 0.8, 0.8);
	Color tab_selected_color = dock_select->get_theme_color(SNAME("mono_color"), EditorStringName(Editor));
	Color tab_unselected_color = used_dock_color;
	Color unused_dock_color = used_dock_color;
	unused_dock_color.a = 0.4;
	Color unusable_dock_color = unused_dock_color;
	unusable_dock_color.a = 0.1;

	// Update sizes.
	Size2 dock_size = dock_select->get_size();
	dock_size.x /= 6.0;
	dock_size.y /= 2.0;

	Size2 center_panel_size = dock_size * 2.0;
	Rect2 center_panel_rect(center_panel_size.x, 0, center_panel_size.x, center_panel_size.y);

	if (dock_select->is_layout_rtl()) {
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_UR] = Rect2(Point2(), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_BR] = Rect2(Point2(0, dock_size.y), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_UL] = Rect2(Point2(dock_size.x, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_BL] = Rect2(dock_size, dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_UR] = Rect2(Point2(dock_size.x * 4, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_BR] = Rect2(Point2(dock_size.x * 4, dock_size.y), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_UL] = Rect2(Point2(dock_size.x * 5, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_BL] = Rect2(Point2(dock_size.x * 5, dock_size.y), dock_size);
	} else {
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_UL] = Rect2(Point2(), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_BL] = Rect2(Point2(0, dock_size.y), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_UR] = Rect2(Point2(dock_size.x, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_LEFT_BR] = Rect2(dock_size, dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_UL] = Rect2(Point2(dock_size.x * 4, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_BL] = Rect2(Point2(dock_size.x * 4, dock_size.y), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_UR] = Rect2(Point2(dock_size.x * 5, 0), dock_size);
		dock_select_rects[EditorDockManager::DOCK_SLOT_RIGHT_BR] = Rect2(Point2(dock_size.x * 5, dock_size.y), dock_size);
	}

	int max_tabs = 3;
	int rtl_dir = dock_select->is_layout_rtl() ? -1 : 1;
	real_t tab_height = 3.0 * EDSCALE;
	real_t tab_spacing = 1.0 * EDSCALE;
	real_t dock_spacing = 2.0 * EDSCALE;
	real_t dock_top_spacing = tab_height + dock_spacing;

	TabContainer *context_tab_container = dock_manager->get_dock_tab_container(context_dock);
	int context_tab_index = -1;
	if (context_tab_container && context_tab_container->get_tab_count() > 0) {
		context_tab_index = context_tab_container->get_tab_idx_from_control(context_dock);
	}

	// Draw center panel.
	Rect2 center_panel_draw_rect = center_panel_rect.grow_individual(-dock_spacing, -dock_top_spacing, -dock_spacing, -dock_spacing);
	dock_select->draw_rect(center_panel_draw_rect, unusable_dock_color);

	// Draw all dock slots.
	for (int i = 0; i < EditorDockManager::DOCK_SLOT_MAX; i++) {
		Rect2 dock_slot_draw_rect = dock_select_rects[i].grow_individual(-dock_spacing, -dock_top_spacing, -dock_spacing, -dock_spacing);
		real_t tab_width = Math::round(dock_slot_draw_rect.size.width / max_tabs);
		Rect2 tab_draw_rect = Rect2(dock_slot_draw_rect.position.x, dock_select_rects[i].position.y, tab_width - tab_spacing, tab_height);
		if (dock_select->is_layout_rtl()) {
			tab_draw_rect.position.x += dock_slot_draw_rect.size.x - tab_draw_rect.size.x;
		}
		bool is_context_dock = context_tab_container == dock_manager->dock_slot[i];
		int tabs_to_draw = MIN(max_tabs, dock_manager->dock_slot[i]->get_tab_count());

		if (i == dock_select_rect_over_idx) {
			dock_select->draw_rect(dock_slot_draw_rect, hovered_dock_color);
		} else if (tabs_to_draw == 0) {
			dock_select->draw_rect(dock_slot_draw_rect, unused_dock_color);
		} else {
			dock_select->draw_rect(dock_slot_draw_rect, used_dock_color);
		}

		// Draw tabs above each used dock slot.
		for (int j = 0; j < tabs_to_draw; j++) {
			Color tab_color = tab_unselected_color;
			if (is_context_dock && context_tab_index == j) {
				tab_color = tab_selected_color;
			}
			Rect2 tabj_draw_rect = tab_draw_rect;
			tabj_draw_rect.position.x += tab_width * j * rtl_dir;
			dock_select->draw_rect(tabj_draw_rect, tab_color);
		}
	}
}

void DockContextPopup::_update_buttons() {
	TabContainer *context_tab_container = dock_manager->get_dock_tab_container(context_dock);
	bool dock_at_bottom = dock_manager->_is_dock_at_bottom(context_dock);

	// Update tab move buttons.
	tab_move_left_button->set_disabled(true);
	tab_move_right_button->set_disabled(true);
	if (!dock_at_bottom && context_tab_container && context_tab_container->get_tab_count() > 0) {
		int context_tab_index = context_tab_container->get_tab_idx_from_control(context_dock);
		tab_move_left_button->set_disabled(context_tab_index == 0);
		tab_move_right_button->set_disabled(context_tab_index >= context_tab_container->get_tab_count() - 1);
	}

	dock_to_bottom_button->set_visible(!dock_at_bottom && bool(context_dock->call("_can_dock_horizontal")));
	reset_size();
}

void DockContextPopup::select_current_dock_in_dock_slot(int p_dock_slot) {
	context_dock = dock_manager->dock_slot[p_dock_slot]->get_current_tab_control();
	_update_buttons();
}

void DockContextPopup::set_dock(Control *p_dock) {
	context_dock = p_dock;
	_update_buttons();
}

Control *DockContextPopup::get_dock() const {
	return context_dock;
}

void DockContextPopup::docks_updated() {
	if (!is_visible()) {
		return;
	}
	_update_buttons();
}

DockContextPopup::DockContextPopup() {
	dock_manager = EditorDockManager::get_singleton();

	dock_select_popup_vb = memnew(VBoxContainer);
	add_child(dock_select_popup_vb);

	HBoxContainer *header_hb = memnew(HBoxContainer);
	tab_move_left_button = memnew(Button);
	tab_move_left_button->set_flat(true);
	tab_move_left_button->set_focus_mode(Control::FOCUS_NONE);
	tab_move_left_button->connect("pressed", callable_mp(this, &DockContextPopup::_tab_move_left));
	header_hb->add_child(tab_move_left_button);

	Label *position_label = memnew(Label);
	position_label->set_text(TTR("Dock Position"));
	position_label->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	position_label->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_CENTER);
	header_hb->add_child(position_label);

	tab_move_right_button = memnew(Button);
	tab_move_right_button->set_flat(true);
	tab_move_right_button->set_focus_mode(Control::FOCUS_NONE);
	tab_move_right_button->connect("pressed", callable_mp(this, &DockContextPopup::_tab_move_right));

	header_hb->add_child(tab_move_right_button);
	dock_select_popup_vb->add_child(header_hb);

	dock_select = memnew(Control);
	dock_select->set_custom_minimum_size(Size2(128, 64) * EDSCALE);
	dock_select->connect("gui_input", callable_mp(this, &DockContextPopup::_dock_select_input));
	dock_select->connect("draw", callable_mp(this, &DockContextPopup::_dock_select_draw));
	dock_select->connect("mouse_exited", callable_mp(this, &DockContextPopup::_dock_select_mouse_exited));
	dock_select->set_v_size_flags(Control::SIZE_EXPAND_FILL);
	dock_select_popup_vb->add_child(dock_select);

	make_float_button = memnew(Button);
	make_float_button->set_text(TTR("Make Floating"));
	if (!EditorNode::get_singleton()->is_multi_window_enabled()) {
		make_float_button->set_disabled(true);
		make_float_button->set_tooltip_text(EditorNode::get_singleton()->get_multiwindow_support_tooltip_text());
	} else {
		make_float_button->set_tooltip_text(TTR("Make this dock floating."));
	}
	make_float_button->set_focus_mode(Control::FOCUS_NONE);
	make_float_button->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	make_float_button->connect("pressed", callable_mp(this, &DockContextPopup::_float_dock));
	dock_select_popup_vb->add_child(make_float_button);

	dock_to_bottom_button = memnew(Button);
	dock_to_bottom_button->set_text(TTR("Move to Bottom"));
	dock_to_bottom_button->set_tooltip_text(TTR("Move this dock to the bottom panel."));
	dock_to_bottom_button->set_focus_mode(Control::FOCUS_NONE);
	dock_to_bottom_button->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	dock_to_bottom_button->connect("pressed", callable_mp(this, &DockContextPopup::_move_dock_to_bottom));
	dock_to_bottom_button->hide();
	dock_select_popup_vb->add_child(dock_to_bottom_button);

	close_button = memnew(Button);
	close_button->set_text(TTR("Close"));
	close_button->set_tooltip_text(TTR("Close this dock."));
	close_button->set_focus_mode(Control::FOCUS_NONE);
	close_button->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	close_button->connect("pressed", callable_mp(this, &DockContextPopup::_close_dock));
	dock_select_popup_vb->add_child(close_button);
}