/**************************************************************************/
/*  progress_dialog.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:                                              */
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/* 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,   */
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/**************************************************************************/

#include "progress_dialog.h"

#include "core/os/os.h"
#include "editor/editor_interface.h"
#include "editor/editor_node.h"
#include "editor/themes/editor_scale.h"
#include "main/main.h"
#include "servers/display_server.h"

void BackgroundProgress::_add_task(const String &p_task, const String &p_label, int p_steps) {
	_THREAD_SAFE_METHOD_
	ERR_FAIL_COND_MSG(tasks.has(p_task), "Task '" + p_task + "' already exists.");
	BackgroundProgress::Task t;
	t.hb = memnew(HBoxContainer);
	Label *l = memnew(Label);
	l->set_text(p_label + " ");
	t.hb->add_child(l);
	t.progress = memnew(ProgressBar);
	t.progress->set_max(p_steps);
	t.progress->set_value(p_steps);
	Control *ec = memnew(Control);
	ec->set_h_size_flags(SIZE_EXPAND_FILL);
	ec->set_v_size_flags(SIZE_EXPAND_FILL);
	t.progress->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	ec->add_child(t.progress);
	ec->set_custom_minimum_size(Size2(80, 5) * EDSCALE);
	t.hb->add_child(ec);

	add_child(t.hb);

	tasks[p_task] = t;
}

void BackgroundProgress::_update() {
	_THREAD_SAFE_METHOD_

	for (const KeyValue<String, int> &E : updates) {
		if (tasks.has(E.key)) {
			_task_step(E.key, E.value);
		}
	}

	updates.clear();
}

void BackgroundProgress::_task_step(const String &p_task, int p_step) {
	_THREAD_SAFE_METHOD_

	ERR_FAIL_COND(!tasks.has(p_task));

	Task &t = tasks[p_task];
	if (p_step < 0) {
		t.progress->set_value(t.progress->get_value() + 1);
	} else {
		t.progress->set_value(p_step);
	}
}

void BackgroundProgress::_end_task(const String &p_task) {
	_THREAD_SAFE_METHOD_

	ERR_FAIL_COND(!tasks.has(p_task));
	Task &t = tasks[p_task];

	memdelete(t.hb);
	tasks.erase(p_task);
}

void BackgroundProgress::add_task(const String &p_task, const String &p_label, int p_steps) {
	callable_mp(this, &BackgroundProgress::_add_task).call_deferred(p_task, p_label, p_steps);
}

void BackgroundProgress::task_step(const String &p_task, int p_step) {
	//this code is weird, but it prevents deadlock.
	bool no_updates = true;
	{
		_THREAD_SAFE_METHOD_
		no_updates = updates.is_empty();
	}

	if (no_updates) {
		callable_mp(this, &BackgroundProgress::_update).call_deferred();
	}

	{
		_THREAD_SAFE_METHOD_
		updates[p_task] = p_step;
	}
}

void BackgroundProgress::end_task(const String &p_task) {
	callable_mp(this, &BackgroundProgress::_end_task).call_deferred(p_task);
}

////////////////////////////////////////////////

ProgressDialog *ProgressDialog::singleton = nullptr;

void ProgressDialog::_update_ui() {
	// Run main loop for two frames.
	if (is_inside_tree()) {
		DisplayServer::get_singleton()->process_events();
		Main::iteration();
	}
}

void ProgressDialog::_popup() {
	Size2 ms = main->get_combined_minimum_size();
	ms.width = MAX(500 * EDSCALE, ms.width);

	Ref<StyleBox> style = main->get_theme_stylebox(SceneStringName(panel), SNAME("PopupMenu"));
	ms += style->get_minimum_size();

	main->set_offset(SIDE_LEFT, style->get_margin(SIDE_LEFT));
	main->set_offset(SIDE_RIGHT, -style->get_margin(SIDE_RIGHT));
	main->set_offset(SIDE_TOP, style->get_margin(SIDE_TOP));
	main->set_offset(SIDE_BOTTOM, -style->get_margin(SIDE_BOTTOM));

	if (is_inside_tree()) {
		Rect2i adjust = _popup_adjust_rect();
		if (adjust != Rect2i()) {
			set_position(adjust.position);
			set_size(adjust.size);
		}
	} else {
		for (Window *window : host_windows) {
			if (window->has_focus()) {
				popup_exclusive_centered(window, ms);
				return;
			}
		}
		// No host window found, use main window.
		EditorInterface::get_singleton()->popup_dialog_centered(this, ms);
	}
}

void ProgressDialog::add_task(const String &p_task, const String &p_label, int p_steps, bool p_can_cancel) {
	if (MessageQueue::get_singleton()->is_flushing()) {
		ERR_PRINT("Do not use progress dialog (task) while flushing the message queue or using call_deferred()!");
		return;
	}

	ERR_FAIL_COND_MSG(tasks.has(p_task), "Task '" + p_task + "' already exists.");
	ProgressDialog::Task t;
	t.vb = memnew(VBoxContainer);
	VBoxContainer *vb2 = memnew(VBoxContainer);
	t.vb->add_margin_child(p_label, vb2);
	t.progress = memnew(ProgressBar);
	t.progress->set_max(p_steps);
	t.progress->set_value(p_steps);
	vb2->add_child(t.progress);
	t.state = memnew(Label);
	t.state->set_clip_text(true);
	vb2->add_child(t.state);
	main->add_child(t.vb);

	tasks[p_task] = t;
	if (p_can_cancel) {
		cancel_hb->show();
	} else {
		cancel_hb->hide();
	}
	cancel_hb->move_to_front();
	canceled = false;
	_popup();
	if (p_can_cancel) {
		cancel->grab_focus();
	}
	_update_ui();
}

bool ProgressDialog::task_step(const String &p_task, const String &p_state, int p_step, bool p_force_redraw) {
	ERR_FAIL_COND_V(!tasks.has(p_task), canceled);

	if (!p_force_redraw) {
		uint64_t tus = OS::get_singleton()->get_ticks_usec();
		if (tus - last_progress_tick < 200000) { //200ms
			return canceled;
		}
	}

	Task &t = tasks[p_task];
	if (p_step < 0) {
		t.progress->set_value(t.progress->get_value() + 1);
	} else {
		t.progress->set_value(p_step);
	}

	t.state->set_text(p_state);
	last_progress_tick = OS::get_singleton()->get_ticks_usec();
	_update_ui();

	return canceled;
}

void ProgressDialog::end_task(const String &p_task) {
	ERR_FAIL_COND(!tasks.has(p_task));
	Task &t = tasks[p_task];

	memdelete(t.vb);
	tasks.erase(p_task);

	if (tasks.is_empty()) {
		hide();
	} else {
		_popup();
	}
}

void ProgressDialog::add_host_window(Window *p_window) {
	ERR_FAIL_NULL(p_window);
	host_windows.push_back(p_window);
}

void ProgressDialog::_cancel_pressed() {
	canceled = true;
}

ProgressDialog::ProgressDialog() {
	main = memnew(VBoxContainer);
	add_child(main);
	main->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	set_exclusive(true);
	set_flag(Window::FLAG_POPUP, false);
	last_progress_tick = 0;
	singleton = this;
	cancel_hb = memnew(HBoxContainer);
	main->add_child(cancel_hb);
	cancel_hb->hide();
	cancel = memnew(Button);
	cancel_hb->add_spacer();
	cancel_hb->add_child(cancel);
	cancel->set_text(TTR("Cancel"));
	cancel_hb->add_spacer();
	cancel->connect(SceneStringName(pressed), callable_mp(this, &ProgressDialog::_cancel_pressed));
}