/*************************************************************************/
/*  skeleton_modification_stack_3d.cpp                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "skeleton_modification_stack_3d.h"
#include "scene/3d/skeleton_3d.h"

///////////////////////////////////////
// ModificationStack3D
///////////////////////////////////////

void SkeletonModificationStack3D::_get_property_list(List<PropertyInfo> *p_list) const {
	for (uint32_t i = 0; i < modifications.size(); i++) {
		p_list->push_back(
				PropertyInfo(Variant::OBJECT, "modifications/" + itos(i),
						PROPERTY_HINT_RESOURCE_TYPE,
						"SkeletonModification3D",
						PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_DEFERRED_SET_RESOURCE | PROPERTY_USAGE_DO_NOT_SHARE_ON_DUPLICATE));
	}
}

bool SkeletonModificationStack3D::_set(const StringName &p_path, const Variant &p_value) {
	String path = p_path;

	if (path.begins_with("modifications/")) {
		int mod_idx = path.get_slicec('/', 1).to_int();
		set_modification(mod_idx, p_value);
		return true;
	}
	return true;
}

bool SkeletonModificationStack3D::_get(const StringName &p_path, Variant &r_ret) const {
	String path = p_path;

	if (path.begins_with("modifications/")) {
		int mod_idx = path.get_slicec('/', 1).to_int();
		r_ret = get_modification(mod_idx);
		return true;
	}
	return true;
}

void SkeletonModificationStack3D::setup() {
	if (is_setup) {
		return;
	}

	if (skeleton != nullptr) {
		is_setup = true;
		for (uint32_t i = 0; i < modifications.size(); i++) {
			if (!modifications[i].is_valid()) {
				continue;
			}
			modifications[i]->_setup_modification(this);
		}
	} else {
		WARN_PRINT("Cannot setup SkeletonModificationStack3D: no skeleton set!");
	}
}

void SkeletonModificationStack3D::execute(real_t p_delta, int p_execution_mode) {
	ERR_FAIL_COND_MSG(!is_setup || skeleton == nullptr || is_queued_for_deletion(),
			"Modification stack is not properly setup and therefore cannot execute!");

	if (!skeleton->is_inside_tree()) {
		ERR_PRINT_ONCE("Skeleton is not inside SceneTree! Cannot execute modification!");
		return;
	}

	if (!enabled) {
		return;
	}

	for (uint32_t i = 0; i < modifications.size(); i++) {
		if (!modifications[i].is_valid()) {
			continue;
		}

		if (modifications[i]->get_execution_mode() == p_execution_mode) {
			modifications[i]->_execute(p_delta);
		}
	}
}

void SkeletonModificationStack3D::enable_all_modifications(bool p_enabled) {
	for (uint32_t i = 0; i < modifications.size(); i++) {
		if (!modifications[i].is_valid()) {
			continue;
		}
		modifications[i]->set_enabled(p_enabled);
	}
}

Ref<SkeletonModification3D> SkeletonModificationStack3D::get_modification(int p_mod_idx) const {
	const int modifications_size = modifications.size();
	ERR_FAIL_INDEX_V(p_mod_idx, modifications_size, nullptr);
	return modifications[p_mod_idx];
}

void SkeletonModificationStack3D::add_modification(Ref<SkeletonModification3D> p_mod) {
	ERR_FAIL_NULL(p_mod);
	p_mod->_setup_modification(this);
	modifications.push_back(p_mod);
}

void SkeletonModificationStack3D::delete_modification(int p_mod_idx) {
	const int modifications_size = modifications.size();
	ERR_FAIL_INDEX(p_mod_idx, modifications_size);
	modifications.remove(p_mod_idx);
}

void SkeletonModificationStack3D::set_modification(int p_mod_idx, Ref<SkeletonModification3D> p_mod) {
	const int modifications_size = modifications.size();
	ERR_FAIL_INDEX(p_mod_idx, modifications_size);

	if (p_mod == nullptr) {
		modifications.remove(p_mod_idx);
	} else {
		p_mod->_setup_modification(this);
		modifications[p_mod_idx] = p_mod;
	}
}

void SkeletonModificationStack3D::set_modification_count(int p_count) {
	modifications.resize(p_count);
	notify_property_list_changed();
}

int SkeletonModificationStack3D::get_modification_count() const {
	return modifications.size();
}

void SkeletonModificationStack3D::set_skeleton(Skeleton3D *p_skeleton) {
	skeleton = p_skeleton;
}

Skeleton3D *SkeletonModificationStack3D::get_skeleton() const {
	return skeleton;
}

bool SkeletonModificationStack3D::get_is_setup() const {
	return is_setup;
}

void SkeletonModificationStack3D::set_enabled(bool p_enabled) {
	enabled = p_enabled;

	if (!enabled && is_setup && skeleton != nullptr) {
		skeleton->clear_bones_local_pose_override();
	}
}

bool SkeletonModificationStack3D::get_enabled() const {
	return enabled;
}

void SkeletonModificationStack3D::set_strength(real_t p_strength) {
	ERR_FAIL_COND_MSG(p_strength < 0, "Strength cannot be less than zero!");
	ERR_FAIL_COND_MSG(p_strength > 1, "Strength cannot be more than one!");
	strength = p_strength;
}

real_t SkeletonModificationStack3D::get_strength() const {
	return strength;
}

void SkeletonModificationStack3D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("setup"), &SkeletonModificationStack3D::setup);
	ClassDB::bind_method(D_METHOD("execute", "delta", "execution_mode"), &SkeletonModificationStack3D::execute);

	ClassDB::bind_method(D_METHOD("enable_all_modifications", "enabled"), &SkeletonModificationStack3D::enable_all_modifications);
	ClassDB::bind_method(D_METHOD("get_modification", "mod_idx"), &SkeletonModificationStack3D::get_modification);
	ClassDB::bind_method(D_METHOD("add_modification", "modification"), &SkeletonModificationStack3D::add_modification);
	ClassDB::bind_method(D_METHOD("delete_modification", "mod_idx"), &SkeletonModificationStack3D::delete_modification);
	ClassDB::bind_method(D_METHOD("set_modification", "mod_idx", "modification"), &SkeletonModificationStack3D::set_modification);

	ClassDB::bind_method(D_METHOD("set_modification_count", "count"), &SkeletonModificationStack3D::set_modification_count);
	ClassDB::bind_method(D_METHOD("get_modification_count"), &SkeletonModificationStack3D::get_modification_count);

	ClassDB::bind_method(D_METHOD("get_is_setup"), &SkeletonModificationStack3D::get_is_setup);

	ClassDB::bind_method(D_METHOD("set_enabled", "enabled"), &SkeletonModificationStack3D::set_enabled);
	ClassDB::bind_method(D_METHOD("get_enabled"), &SkeletonModificationStack3D::get_enabled);

	ClassDB::bind_method(D_METHOD("set_strength", "strength"), &SkeletonModificationStack3D::set_strength);
	ClassDB::bind_method(D_METHOD("get_strength"), &SkeletonModificationStack3D::get_strength);

	ClassDB::bind_method(D_METHOD("get_skeleton"), &SkeletonModificationStack3D::get_skeleton);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "enabled"), "set_enabled", "get_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "strength", PROPERTY_HINT_RANGE, "0, 1, 0.001"), "set_strength", "get_strength");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "modification_count", PROPERTY_HINT_RANGE, "0, 100, 1"), "set_modification_count", "get_modification_count");
}

SkeletonModificationStack3D::SkeletonModificationStack3D() {
}