/*
 * Copyright (C) 2021  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "entity/commands.hpp"
#include "entity/components/model.hpp"
#include "entity/components/transform.hpp"
#include "entity/components/copy-transform.hpp"
#include "entity/components/snap.hpp"
#include "entity/components/parent.hpp"
#include <limits>

namespace entity {
namespace command {

void translate(entity::registry& registry, entity::id entity_id, const float3& translation)
{
	if (registry.has<component::transform>(entity_id))
	{
		component::transform& transform = registry.get<component::transform>(entity_id);
		transform.local.translation += translation;
	}
}

void move_to(entity::registry& registry, entity::id entity_id, const float3& position)
{
	if (registry.has<component::transform>(entity_id))
	{
		component::transform& transform = registry.get<component::transform>(entity_id);
		transform.local.translation = position;
	}
}

void warp_to(entity::registry& registry, entity::id entity_id, const float3& position)
{
	if (registry.has<component::transform>(entity_id))
	{
		component::transform& transform = registry.get<component::transform>(entity_id);
		transform.local.translation = position;
		transform.warp = true;
	}
}

void set_scale(entity::registry& registry, entity::id entity_id, const float3& scale)
{
	if (registry.has<component::transform>(entity_id))
	{
		component::transform& transform = registry.get<component::transform>(entity_id);
		transform.local.scale = scale;
	}
}

void set_transform(entity::registry& registry, entity::id entity_id, const math::transform<float>& transform, bool warp)
{
	if (registry.has<component::transform>(entity_id))
	{
		component::transform& component = registry.get<component::transform>(entity_id);
		component.local = transform;
		component.warp = warp;
	}
}

void place(entity::registry& registry, entity::id entity_id, const float2& translation)
{
	component::snap component;
	component.warp = true;
	component.relative = false;
	component.autoremove = true;
	component.ray.origin = {translation[0], 10000.0f, translation[1]};
	component.ray.direction = {0.0f, -1.0f, 0.0f};
	registry.assign_or_replace<component::snap>(entity_id, component);
}

void assign_render_layers(entity::registry& registry, entity::id entity_id, unsigned int layers)
{
	if (registry.has<component::model>(entity_id))
	{
		component::model model = registry.get<component::model>(entity_id);
		model.layers = layers;
		registry.replace<component::model>(entity_id, model);
		
		// Apply to child layers
		registry.view<component::parent>().each(
		[&](entity::id entity_id, auto& component)
		{
			if (component.parent == entity_id)
				assign_render_layers(registry, entity_id, layers);
		});
	}
}

void bind_transform(entity::registry& registry, entity::id source, entity::id target)
{
	component::copy_transform copy_transform = {target};
	registry.assign_or_replace<component::copy_transform>(source, copy_transform);
}

math::transform<float> get_local_transform(entity::registry& registry, entity::id entity_id)
{
	if (registry.has<component::transform>(entity_id))
	{
		const component::transform& component = registry.get<component::transform>(entity_id);
		return component.local;
	}
	
	return math::identity_transform<float>;
}

math::transform<float> get_world_transform(entity::registry& registry, entity::id entity_id)
{
	if (registry.has<component::transform>(entity_id))
	{
		const component::transform& component = registry.get<component::transform>(entity_id);
		return component.world;
	}
	
	return math::identity_transform<float>;
}

void parent(entity::registry& registry, entity::id child, entity::id parent)
{
	component::parent component;
	component.parent = parent;
	registry.assign_or_replace<component::parent>(child, component);
}

} // namespace command
} // namespace entity