/**************************************************************************/
/*  editor_bottom_panel.cpp                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* Permission is hereby granted, free of charge, to any person obtaining  */
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#include "editor_bottom_panel.h"

#include "core/os/time.h"
#include "core/version.h"
#include "editor/debugger/editor_debugger_node.h"
#include "editor/editor_about.h"
#include "editor/editor_command_palette.h"
#include "editor/editor_node.h"
#include "editor/editor_string_names.h"
#include "editor/engine_update_label.h"
#include "editor/gui/editor_toaster.h"
#include "editor/themes/editor_scale.h"
#include "scene/gui/box_container.h"
#include "scene/gui/button.h"
#include "scene/gui/link_button.h"

// The metadata key used to store and retrieve the version text to copy to the clipboard.
static const String META_TEXT_TO_COPY = "text_to_copy";

void EditorBottomPanel::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			expand_button->set_icon(get_editor_theme_icon(SNAME("ExpandBottomDock")));
		} break;
	}
}

void EditorBottomPanel::_switch_by_control(bool p_visible, Control *p_control) {
	for (int i = 0; i < items.size(); i++) {
		if (items[i].control == p_control) {
			_switch_to_item(p_visible, i);
			return;
		}
	}
}

void EditorBottomPanel::_switch_to_item(bool p_visible, int p_idx) {
	ERR_FAIL_INDEX(p_idx, items.size());

	if (items[p_idx].control->is_visible() == p_visible) {
		return;
	}

	SplitContainer *center_split = Object::cast_to<SplitContainer>(get_parent());
	ERR_FAIL_NULL(center_split);

	if (p_visible) {
		for (int i = 0; i < items.size(); i++) {
			items[i].button->set_pressed_no_signal(i == p_idx);
			items[i].control->set_visible(i == p_idx);
		}
		if (EditorDebuggerNode::get_singleton() == items[p_idx].control) {
			// This is the debug panel which uses tabs, so the top section should be smaller.
			add_theme_style_override(SceneStringName(panel), get_theme_stylebox(SNAME("BottomPanelDebuggerOverride"), EditorStringName(EditorStyles)));
		} else {
			add_theme_style_override(SceneStringName(panel), get_theme_stylebox(SNAME("BottomPanel"), EditorStringName(EditorStyles)));
		}
		center_split->set_dragger_visibility(SplitContainer::DRAGGER_VISIBLE);
		center_split->set_collapsed(false);
		if (expand_button->is_pressed()) {
			EditorNode::get_top_split()->hide();
		}
		expand_button->show();
	} else {
		add_theme_style_override(SceneStringName(panel), get_theme_stylebox(SNAME("BottomPanel"), EditorStringName(EditorStyles)));
		items[p_idx].button->set_pressed_no_signal(false);
		items[p_idx].control->set_visible(false);
		center_split->set_dragger_visibility(SplitContainer::DRAGGER_HIDDEN);
		center_split->set_collapsed(true);
		expand_button->hide();
		if (expand_button->is_pressed()) {
			EditorNode::get_top_split()->show();
		}
	}

	last_opened_control = items[p_idx].control;
}

void EditorBottomPanel::_expand_button_toggled(bool p_pressed) {
	EditorNode::get_top_split()->set_visible(!p_pressed);
}

void EditorBottomPanel::_version_button_pressed() {
	DisplayServer::get_singleton()->clipboard_set(version_btn->get_meta(META_TEXT_TO_COPY));
}

bool EditorBottomPanel::_button_drag_hover(const Vector2 &, const Variant &, Button *p_button, Control *p_control) {
	if (!p_button->is_pressed()) {
		_switch_by_control(true, p_control);
	}
	return false;
}

void EditorBottomPanel::save_layout_to_config(Ref<ConfigFile> p_config_file, const String &p_section) const {
	int selected_item_idx = -1;
	for (int i = 0; i < items.size(); i++) {
		if (items[i].button->is_pressed()) {
			selected_item_idx = i;
			break;
		}
	}
	if (selected_item_idx != -1) {
		p_config_file->set_value(p_section, "selected_bottom_panel_item", selected_item_idx);
	} else {
		p_config_file->set_value(p_section, "selected_bottom_panel_item", Variant());
	}
}

void EditorBottomPanel::load_layout_from_config(Ref<ConfigFile> p_config_file, const String &p_section) {
	bool has_active_tab = false;
	if (p_config_file->has_section_key(p_section, "selected_bottom_panel_item")) {
		int selected_item_idx = p_config_file->get_value(p_section, "selected_bottom_panel_item");
		if (selected_item_idx >= 0 && selected_item_idx < items.size()) {
			// Make sure we don't try to open contextual editors which are not enabled in the current context.
			if (items[selected_item_idx].button->is_visible()) {
				_switch_to_item(true, selected_item_idx);
				has_active_tab = true;
			}
		}
	}
	// If there is no active tab we need to collapse the panel.
	if (!has_active_tab) {
		items[0].control->show(); // _switch_to_item() can collapse only visible tabs.
		_switch_to_item(false, 0);
	}
}

Button *EditorBottomPanel::add_item(String p_text, Control *p_item, const Ref<Shortcut> &p_shortcut, bool p_at_front) {
	Button *tb = memnew(Button);
	tb->set_theme_type_variation("BottomPanelButton");
	tb->connect("toggled", callable_mp(this, &EditorBottomPanel::_switch_by_control).bind(p_item));
	tb->set_drag_forwarding(Callable(), callable_mp(this, &EditorBottomPanel::_button_drag_hover).bind(tb, p_item), Callable());
	tb->set_text(p_text);
	tb->set_shortcut(p_shortcut);
	tb->set_toggle_mode(true);
	tb->set_focus_mode(Control::FOCUS_NONE);
	item_vbox->add_child(p_item);

	bottom_hbox->move_to_front();
	button_hbox->add_child(tb);
	if (p_at_front) {
		button_hbox->move_child(tb, 0);
	}
	p_item->set_v_size_flags(Control::SIZE_EXPAND_FILL);
	p_item->hide();

	BottomPanelItem bpi;
	bpi.button = tb;
	bpi.control = p_item;
	bpi.name = p_text;
	items.push_back(bpi);

	return tb;
}

void EditorBottomPanel::remove_item(Control *p_item) {
	for (int i = 0; i < items.size(); i++) {
		if (items[i].control == p_item) {
			if (p_item->is_visible_in_tree()) {
				_switch_to_item(false, i);
			}
			item_vbox->remove_child(items[i].control);
			button_hbox->remove_child(items[i].button);
			memdelete(items[i].button);
			items.remove_at(i);
			break;
		}
	}
}

void EditorBottomPanel::make_item_visible(Control *p_item, bool p_visible) {
	_switch_by_control(p_visible, p_item);
}

void EditorBottomPanel::move_item_to_end(Control *p_item) {
	for (int i = 0; i < items.size(); i++) {
		if (items[i].control == p_item) {
			items[i].button->move_to_front();
			SWAP(items.write[i], items.write[items.size() - 1]);
			break;
		}
	}
}

void EditorBottomPanel::hide_bottom_panel() {
	for (int i = 0; i < items.size(); i++) {
		if (items[i].control->is_visible()) {
			_switch_to_item(false, i);
			break;
		}
	}
}

void EditorBottomPanel::toggle_last_opened_bottom_panel() {
	// Select by control instead of index, so that the last bottom panel is opened correctly
	// if it's been reordered since.
	if (last_opened_control) {
		_switch_by_control(!last_opened_control->is_visible(), last_opened_control);
	} else {
		// Open the first panel in the list if no panel was opened this session.
		_switch_to_item(true, 0);
	}
}

EditorBottomPanel::EditorBottomPanel() {
	item_vbox = memnew(VBoxContainer);
	add_child(item_vbox);

	bottom_hbox = memnew(HBoxContainer);
	bottom_hbox->set_custom_minimum_size(Size2(0, 24 * EDSCALE)); // Adjust for the height of the "Expand Bottom Dock" icon.
	item_vbox->add_child(bottom_hbox);

	button_hbox = memnew(HBoxContainer);
	button_hbox->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	bottom_hbox->add_child(button_hbox);

	editor_toaster = memnew(EditorToaster);
	bottom_hbox->add_child(editor_toaster);

	version_btn = memnew(LinkButton);
	version_btn->set_text(VERSION_FULL_CONFIG);
	String hash = String(VERSION_HASH);
	if (hash.length() != 0) {
		hash = " " + vformat("[%s]", hash.left(9));
	}
	// Set the text to copy in metadata as it slightly differs from the button's text.
	version_btn->set_meta(META_TEXT_TO_COPY, "v" VERSION_FULL_BUILD + hash);
	// Fade out the version label to be less prominent, but still readable.
	version_btn->set_self_modulate(Color(1, 1, 1, 0.65));
	version_btn->set_underline_mode(LinkButton::UNDERLINE_MODE_ON_HOVER);
	String build_date;
	if (VERSION_TIMESTAMP > 0) {
		build_date = Time::get_singleton()->get_datetime_string_from_unix_time(VERSION_TIMESTAMP, true) + " UTC";
	} else {
		build_date = TTR("(unknown)");
	}
	version_btn->set_tooltip_text(vformat(TTR("Git commit date: %s\nClick to copy the version information."), build_date));
	version_btn->connect(SceneStringName(pressed), callable_mp(this, &EditorBottomPanel::_version_button_pressed));
	version_btn->set_v_size_flags(Control::SIZE_SHRINK_CENTER);
	bottom_hbox->add_child(version_btn);

	// Add a dummy control node for horizontal spacing.
	Control *h_spacer = memnew(Control);
	bottom_hbox->add_child(h_spacer);

	expand_button = memnew(Button);
	bottom_hbox->add_child(expand_button);
	expand_button->hide();
	expand_button->set_flat(false);
	expand_button->set_theme_type_variation("FlatMenuButton");
	expand_button->set_toggle_mode(true);
	expand_button->set_shortcut(ED_SHORTCUT_AND_COMMAND("editor/bottom_panel_expand", TTR("Expand Bottom Panel"), KeyModifierMask::SHIFT | Key::F12));
	expand_button->connect("toggled", callable_mp(this, &EditorBottomPanel::_expand_button_toggled));
}