/*
Copyright (c) 2013 Daniele Bartolini, Michele Rossi
Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto

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 "Allocator.h"
#include "File.h"
#include "Filesystem.h"
#include "Hash.h"
#include "JSONParser.h"
#include "UnitCompiler.h"
#include "TempAllocator.h"
#include "Log.h"
#include "PhysicsTypes.h"
#include "Quaternion.h"
#include "Vector3.h"
#include "Matrix4x4.h"

namespace crown
{

//-----------------------------------------------------------------------------
UnitCompiler::UnitCompiler()
	: m_renderable(default_allocator())
	, m_camera(default_allocator())
	, m_actor(default_allocator())
	, m_node_names(default_allocator())
	, m_node_parents(default_allocator())
	, m_node_poses(default_allocator())
{
}

//-----------------------------------------------------------------------------
size_t UnitCompiler::compile_impl(Filesystem& fs, const char* resource_path)
{
	File* file = fs.open(resource_path, FOM_READ);

	char file_buf[4096];
	file->read(file_buf, file->size());
	fs.close(file);

	JSONParser json(file_buf);
	JSONElement root = json.root();

	// Check for renderable
	if (root.has_key("renderable"))
	{
		JSONElement renderable_array = root.key("renderable");
		uint32_t renderable_array_size = renderable_array.size();

		for (uint32_t i = 0; i < renderable_array_size; i++)
		{
			const char* type = renderable_array[i].key("type").string_value();
						
			UnitRenderable ur;
			DynamicString renderable;

			if (string::strcmp(type, "mesh") == 0)
			{
				ur.type = UnitRenderable::MESH;
				renderable += renderable_array[i].key("resource").string_value();
				renderable += ".mesh";
			}
			else if (string::strcmp(type, "sprite") == 0)
			{
				ur.type = UnitRenderable::SPRITE;
				renderable += renderable_array[i].key("resource").string_value();
				renderable += ".sprite";
			}
			else
			{
				CE_ASSERT(false, "Oops, unknown renderable type: '%s'", type);
			}

			DynamicString renderable_name;
			renderable_name = renderable_array[i].key("name").string_value();

			ur.resource.id = hash::murmur2_64(renderable.c_str(), string::strlen(renderable.c_str()), 0);
			ur.name = hash::murmur2_32(renderable_name.c_str(), string::strlen(renderable_name.c_str()), 0);
			ur.visible = renderable_array[i].key("visible").bool_value();

			m_renderable.push_back(ur);
		}
	}

	// Check for cameras
	if (root.has_key("camera"))
	{
		JSONElement camera = root.key("camera");
		uint32_t num_cameras = camera.size();

		for (uint32_t i = 0; i < num_cameras; i++)
		{
			JSONElement camera_name = camera[i].key("name");

			UnitCamera uc;
			uc.name = hash::murmur2_32(camera_name.string_value(), camera_name.size(), 0);

			m_camera.push_back(uc);
		}
	}

	// check for actors
	if (root.has_key("actor"))
	{
		JSONElement actor = root.key("actor");
		uint32_t num_actors = actor.size();

		for (uint32_t i = 0; i < num_actors; i++)
		{
			JSONElement actor_name = actor[i].key("name");
			JSONElement actor_type = actor[i].key("type");
			JSONElement actor_shape = actor[i].key("shape");
			JSONElement actor_active = actor[i].key("active");

			UnitActor ua;
			ua.name = hash::murmur2_32(actor_name.string_value(), actor_name.size(), 0);
			ua.type = string::strcmp(actor_type.string_value(), "STATIC") == 0 ? UnitActor::STATIC : UnitActor::DYNAMIC;
			ua.shape = string::strcmp(actor_shape.string_value(), "SPHERE") == 0 ? UnitActor::SPHERE :
						string::strcmp(actor_shape.string_value(), "BOX") == 0 ? UnitActor::BOX : UnitActor::PLANE;
			ua.active = actor_active.bool_value();

			m_actor.push_back(ua);
		}
	}

	// Check for nodes
	if (root.has_key("nodes"))
	{
		JSONElement nodes = root.key("nodes");
		const uint32_t num_nodes = nodes.size();

		for (uint32_t i = 0; i < num_nodes; i++)
		{
			JSONElement node = nodes[i];
			JSONElement node_name = node.key("name");
			JSONElement node_parent = node.key("parent");
			JSONElement node_pos = node.key("position");
			JSONElement node_rot = node.key("rotation");

			// Read name and parent
			m_node_names.push_back(hash::murmur2_32(node_name.string_value(), node_name.size(), 0));

			ParentIndex pidx;
			pidx.parent_index = -1;
			pidx.inner_index = i;

			if (node_parent.is_nil())
			{
				pidx.parent_name = 0xFFFFFFFF;
			}
			else
			{
				pidx.parent_name = hash::murmur2_32(node_parent.string_value(), node_parent.size(), 0);
			}

			m_node_parents.push_back(pidx);

			// Read pose
			const Vector3 pos = Vector3(node_pos[0].float_value(), node_pos[1].float_value(), node_pos[2].float_value());
			const Quaternion rot = Quaternion(Vector3(node_rot[0].float_value(), node_rot[1].float_value(), node_rot[2].float_value()), node_rot[3].float_value());
			m_node_poses.push_back(Matrix4x4(rot, pos));
		}
	}

	// Convert parent names into parent indices
	for (uint32_t i = 0; i < m_node_parents.size(); i++)
	{
		for (uint32_t j = 0; j < m_node_names.size(); j++)
		{
			if (m_node_names[j] == m_node_parents[i].parent_name)
			{
				m_node_parents[i].parent_index = j;
				break;
			}
		}
	}

	// Sort by link depth
	std::sort(m_node_parents.begin(), m_node_parents.end(), ParentIndex());

	return sizeof(UnitHeader) +
			m_renderable.size() * sizeof(UnitRenderable) +
			m_camera.size() * sizeof(UnitCamera) +
			m_actor.size() * sizeof(UnitActor) +
			m_node_names.size() * sizeof(StringId32) +
			m_node_names.size() * sizeof(Matrix4x4) +
			m_node_names.size() * sizeof(int32_t);
}

//-----------------------------------------------------------------------------
void UnitCompiler::write_impl(File* out_file)
{
	UnitHeader header;
	header.num_renderables = m_renderable.size();
	header.num_cameras = m_camera.size();
	header.num_actors = m_actor.size();
	header.num_scene_graph_nodes = m_node_names.size();

	header.renderables_offset = sizeof(UnitHeader);
	header.cameras_offset = sizeof(UnitHeader) + sizeof(UnitRenderable) * header.num_renderables;
	header.actors_offset = sizeof(UnitHeader) + sizeof(UnitCamera) * header.num_cameras;
	header.scene_graph_names_offset = sizeof(UnitHeader) + sizeof(UnitActor) * header.num_actors;
	header.scene_graph_poses_offset = sizeof(UnitHeader) + sizeof(StringId32) * header.num_scene_graph_nodes;
	header.scene_graph_parents_offset = sizeof(UnitHeader) + sizeof(Matrix4x4) * header.num_scene_graph_nodes;

	out_file->write((char*) &header, sizeof(UnitHeader));

	if (m_renderable.size() > 0)
	{
		out_file->write((char*) m_renderable.begin(), sizeof(UnitRenderable) * header.num_renderables);
	}

	if (m_camera.size() > 0)
	{
		out_file->write((char*) m_camera.begin(), sizeof(UnitCamera) * header.num_cameras);
	}

	if (m_actor.size() > 0)
	{
		out_file->write((char*) m_actor.begin(), sizeof(UnitActor) * header.num_actors);
	}

	// Write node names
	for (uint32_t i = 0; i < m_node_names.size(); i++)
	{
		out_file->write((char*) &m_node_names[m_node_parents[i].inner_index], sizeof(StringId32));
	}

	// Write node poses
	for (uint32_t i = 0; i < m_node_names.size(); i++)
	{
		out_file->write((char*) &m_node_poses[m_node_parents[i].inner_index], sizeof(Matrix4x4));
	}

	// Write node parents
	for (uint32_t i = 0; i < m_node_names.size(); i++)
	{
		out_file->write((char*) &m_node_parents[i].parent_index, sizeof(int32_t));
	}

	// Cleanup
	m_renderable.clear();
	m_camera.clear();
	m_actor.clear();
	m_node_names.clear();
	m_node_parents.clear();
	m_node_poses.clear();
}

} // namespace crown