/*
Copyright (c) 2019-2020 Péter Magyar

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 "voxel_library_merger.h"

#include "scene/resources/packed_scene.h"
#include "scene/resources/texture.h"

#include "modules/modules_enabled.gen.h"

#ifdef MODULE_PROPS_ENABLED
#include "../../props/props/prop_data.h"

#include "../../props/props/prop_data_prop.h"
#endif

#ifdef MODULE_MESH_DATA_RESOURCE_ENABLED
#include "../../mesh_data_resource/props/prop_data_mesh_data.h"
#endif

#include "../defines.h"

int VoxelLibraryMerger::get_texture_flags() const {
	return _packer->get_texture_flags();
}
void VoxelLibraryMerger::set_texture_flags(const int flags) {
	_packer->set_texture_flags(flags);
	_prop_packer->set_texture_flags(flags);
}

int VoxelLibraryMerger::get_max_atlas_size() const {
	return _packer->get_max_atlas_size();
}
void VoxelLibraryMerger::set_max_atlas_size(const int size) {
	_packer->set_max_atlas_size(size);
	_prop_packer->set_max_atlas_size(size);
}

bool VoxelLibraryMerger::get_keep_original_atlases() const {
	return _packer->get_keep_original_atlases();
}
void VoxelLibraryMerger::set_keep_original_atlases(const bool value) {
	_packer->set_keep_original_atlases(value);
	_prop_packer->set_keep_original_atlases(value);
}

Color VoxelLibraryMerger::get_background_color() const {
	return _packer->get_background_color();
}
void VoxelLibraryMerger::set_background_color(const Color &color) {
	_packer->set_background_color(color);
	_prop_packer->set_background_color(color);
}

int VoxelLibraryMerger::get_margin() const {
	return _packer->get_margin();
}
void VoxelLibraryMerger::set_margin(const int margin) {
	_packer->set_margin(margin);
	_prop_packer->set_margin(margin);
}

//Surfaces
Ref<VoxelSurface> VoxelLibraryMerger::voxel_surface_get(const int index) {
	ERR_FAIL_INDEX_V(index, _voxel_surfaces.size(), Ref<VoxelSurface>(NULL));

	return _voxel_surfaces[index];
}

void VoxelLibraryMerger::voxel_surface_add(Ref<VoxelSurface> value) {
	ERR_FAIL_COND(!value.is_valid());

	value->set_library(Ref<VoxelLibraryMerger>(this));
	value->set_id(_voxel_surfaces.size());

	_voxel_surfaces.push_back(value);
}

void VoxelLibraryMerger::voxel_surface_set(const int index, Ref<VoxelSurface> value) {
	ERR_FAIL_COND(index < 0);

	if (_voxel_surfaces.size() < index) {
		_voxel_surfaces.resize(index + 1);
	}

	if (_voxel_surfaces[index].is_valid()) {
		_voxel_surfaces.get(index)->set_library(Ref<VoxelLibraryMerger>(NULL));
	}

	if (value.is_valid()) {
		value->set_library(Ref<VoxelLibraryMerger>(this));

		_voxel_surfaces.set(index, value);
	}
}

void VoxelLibraryMerger::voxel_surface_remove(const int index) {
	_voxel_surfaces.remove(index);
}

int VoxelLibraryMerger::voxel_surface_get_num() const {
	return _voxel_surfaces.size();
}

void VoxelLibraryMerger::voxel_surfaces_clear() {
	_packer->clear();

	for (int i = 0; i < _voxel_surfaces.size(); i++) {
		Ref<VoxelSurfaceMerger> surface = _voxel_surfaces[i];

		if (surface.is_valid()) {
			surface->set_library(NULL);
		}
	}

	_voxel_surfaces.clear();
}

Vector<Variant> VoxelLibraryMerger::get_voxel_surfaces() {
	VARIANT_ARRAY_GET(_voxel_surfaces);
}

void VoxelLibraryMerger::set_voxel_surfaces(const Vector<Variant> &surfaces) {
	_voxel_surfaces.clear();

	for (int i = 0; i < surfaces.size(); i++) {
		Ref<VoxelSurfaceMerger> surface = Ref<VoxelSurfaceMerger>(surfaces[i]);

		if (surface.is_valid()) {
			surface->set_library(this);
		}

		_voxel_surfaces.push_back(surface);
	}
}

#ifdef MODULE_PROPS_ENABLED
Ref<PropData> VoxelLibraryMerger::get_prop(const int index) {
	ERR_FAIL_INDEX_V(index, _props.size(), Ref<PropData>());

	return _props[index];
}
void VoxelLibraryMerger::add_prop(Ref<PropData> value) {
	_props.push_back(value);
}
bool VoxelLibraryMerger::has_prop(const Ref<PropData> &value) const {
	return _props.find(value) != -1;
}
void VoxelLibraryMerger::set_prop(const int index, const Ref<PropData> &value) {
	ERR_FAIL_INDEX(index, _props.size());

	_props.write[index] = value;
}
void VoxelLibraryMerger::remove_prop(const int index) {
	ERR_FAIL_INDEX(index, _props.size());

	_props.remove(index);
}
int VoxelLibraryMerger::get_num_props() const {
	return _props.size();
}
void VoxelLibraryMerger::clear_props() {
	_props.clear();
}

Vector<Variant> VoxelLibraryMerger::get_props() {
	VARIANT_ARRAY_GET(_props);
}

void VoxelLibraryMerger::set_props(const Vector<Variant> &props) {
	VARIANT_ARRAY_SET(props, _props, PropData);
}

Rect2 VoxelLibraryMerger::get_prop_uv_rect(const Ref<Texture> &texture) {
	if (!texture.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Ref<AtlasTexture> at = _prop_packer->get_texture(texture);

	if (!at.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Rect2 region = at->get_region();

	Ref<Texture> tex = at->get_atlas();

	if (!tex.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Ref<Image> image = tex->get_data();

	if (!image.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	float w = image->get_width();
	float h = image->get_height();

	region.position = Size2(region.position.x / w, region.position.y / h);
	region.size = Size2(region.size.x / w, region.size.y / h);

	return region;
}

Ref<TexturePacker> VoxelLibraryMerger::get_prop_packer() {
	return _prop_packer;
}
#endif

void VoxelLibraryMerger::refresh_rects() {
	bool texture_added = false;
	for (int i = 0; i < _voxel_surfaces.size(); i++) {
		Ref<VoxelSurfaceMerger> surface = Ref<VoxelSurfaceMerger>(_voxel_surfaces[i]);

		if (surface.is_valid()) {
			for (int j = 0; j < VoxelSurface::VOXEL_SIDES_COUNT; ++j) {
				Ref<Texture> tex = surface->get_texture(static_cast<VoxelSurface::VoxelSurfaceSides>(j));

				if (!tex.is_valid())
					continue;

				if (!_packer->contains_texture(tex)) {
					texture_added = true;
					surface->set_region(static_cast<VoxelSurface::VoxelSurfaceSides>(j), _packer->add_texture(tex));
				} else {
					surface->set_region(static_cast<VoxelSurface::VoxelSurfaceSides>(j), _packer->get_texture(tex));
				}
			}
		}
	}

	if (texture_added) {
		_packer->merge();

		ERR_FAIL_COND(_packer->get_texture_count() == 0);

		Ref<Texture> tex = _packer->get_generated_texture(0);

		setup_material_albedo(MATERIAL_INDEX_VOXELS, tex);
		setup_material_albedo(MATERIAL_INDEX_LIQUID, tex);
	}

#ifdef MODULE_PROPS_ENABLED
	//todo add this back
	//texture_added = false;
	for (int i = 0; i < _props.size(); i++) {
		Ref<PropData> prop = _props.get(i);

		if (prop.is_valid()) {
			if (process_prop_textures(prop))
				texture_added = true;
		}
	}

	//if (texture_added) {
	if (_prop_packer->get_texture_count() > 0) {
		_prop_packer->merge();

		//ERR_FAIL_COND(_prop_packer->get_texture_count() == 0);

		Ref<Texture> tex = _prop_packer->get_generated_texture(0);

		setup_material_albedo(MATERIAL_INDEX_PROP, tex);
	}
#endif

	for (int i = 0; i < _voxel_surfaces.size(); i++) {
		Ref<VoxelSurfaceMerger> surface = _voxel_surfaces[i];

		if (surface.is_valid()) {
			surface->refresh_rects();
		}
	}

	set_initialized(true);
}

void VoxelLibraryMerger::_setup_material_albedo(const int material_index, const Ref<Texture> &texture) {
	Ref<SpatialMaterial> mat;

	int count = 0;

	switch (material_index) {
		case MATERIAL_INDEX_VOXELS:
			count = material_get_num();
			break;
		case MATERIAL_INDEX_LIQUID:
			count = liquid_material_get_num();
			break;
		case MATERIAL_INDEX_PROP:
			count = prop_material_get_num();
			break;
	}

	for (int i = 0; i < count; ++i) {
		switch (material_index) {
			case MATERIAL_INDEX_VOXELS:
				mat = material_get(i);
				break;
			case MATERIAL_INDEX_LIQUID:
				mat = liquid_material_get(i);
				break;
			case MATERIAL_INDEX_PROP:
				mat = prop_material_get(i);
				break;
		}

		Ref<SpatialMaterial> spmat;

		switch (material_index) {
			case MATERIAL_INDEX_VOXELS:
				spmat = material_get(i);
				break;
			case MATERIAL_INDEX_LIQUID:
				spmat = liquid_material_get(i);
				break;
			case MATERIAL_INDEX_PROP:
				spmat = prop_material_get(i);
				break;
		}

		if (spmat.is_valid()) {
			spmat->set_texture(SpatialMaterial::TEXTURE_ALBEDO, texture);
			return;
		}

		Ref<ShaderMaterial> shmat;

		switch (material_index) {
			case MATERIAL_INDEX_VOXELS:
				shmat = material_get(i);
				break;
			case MATERIAL_INDEX_LIQUID:
				shmat = liquid_material_get(i);
				break;
			case MATERIAL_INDEX_PROP:
				shmat = prop_material_get(i);
				break;
		}

		if (shmat.is_valid()) {
			shmat->set_shader_param("texture_albedo", texture);
		}
	}
}

VoxelLibraryMerger::VoxelLibraryMerger() {
	_packer.instance();

	_packer->set_texture_flags(Texture::FLAG_MIPMAPS | Texture::FLAG_FILTER);

	_packer->set_max_atlas_size(1024);
	_packer->set_keep_original_atlases(false);
	_packer->set_margin(0);

	_prop_packer.instance();

	_prop_packer->set_texture_flags(Texture::FLAG_MIPMAPS | Texture::FLAG_FILTER);

	_prop_packer->set_max_atlas_size(1024);
	_prop_packer->set_keep_original_atlases(false);
	_prop_packer->set_margin(0);
}

VoxelLibraryMerger::~VoxelLibraryMerger() {
	for (int i = 0; i < _voxel_surfaces.size(); ++i) {
		Ref<VoxelSurface> surface = _voxel_surfaces[i];

		if (surface.is_valid()) {
			surface->set_library(Ref<VoxelLibraryMerger>());
		}
	}

	_voxel_surfaces.clear();

	_packer->clear();
	_packer.unref();

	_prop_packer->clear();
	_prop_packer.unref();
}

#ifdef MODULE_PROPS_ENABLED
bool VoxelLibraryMerger::process_prop_textures(Ref<PropData> prop) {
	if (!prop.is_valid()) {
		return false;
	}

	bool texture_added = false;

#ifdef MODULE_MESH_DATA_RESOURCE_ENABLED
	for (int i = 0; i < prop->get_prop_count(); ++i) {
		Ref<PropDataMeshData> pdm = prop->get_prop(i);

		if (pdm.is_valid()) {
			Ref<Texture> tex = pdm->get_texture();

			if (!tex.is_valid())
				continue;

			if (!_prop_packer->contains_texture(tex)) {
				_prop_packer->add_texture(tex);
				texture_added = true;
			}
		}

		Ref<PropDataProp> pdp = prop->get_prop(i);

		if (pdp.is_valid()) {
			if (process_prop_textures(pdp))
				texture_added = true;
		}
	}
#endif

	return texture_added;
}
#endif

void VoxelLibraryMerger::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_texture_flags"), &VoxelLibraryMerger::get_texture_flags);
	ClassDB::bind_method(D_METHOD("set_texture_flags", "flags"), &VoxelLibraryMerger::set_texture_flags);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "texture_flags", PROPERTY_HINT_FLAGS, "Mipmaps,Repeat,Filter,Anisotropic Linear,Convert to Linear,Mirrored Repeat,Video Surface"), "set_texture_flags", "get_texture_flags");

	ClassDB::bind_method(D_METHOD("get_max_atlas_size"), &VoxelLibraryMerger::get_max_atlas_size);
	ClassDB::bind_method(D_METHOD("set_max_atlas_size", "size"), &VoxelLibraryMerger::set_max_atlas_size);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "max_atlas_size"), "set_max_atlas_size", "get_max_atlas_size");

	ClassDB::bind_method(D_METHOD("get_keep_original_atlases"), &VoxelLibraryMerger::get_keep_original_atlases);
	ClassDB::bind_method(D_METHOD("set_keep_original_atlases", "value"), &VoxelLibraryMerger::set_keep_original_atlases);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "keep_original_atlases"), "set_keep_original_atlases", "get_keep_original_atlases");

	ClassDB::bind_method(D_METHOD("get_background_color"), &VoxelLibraryMerger::get_background_color);
	ClassDB::bind_method(D_METHOD("set_background_color", "color"), &VoxelLibraryMerger::set_background_color);
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "background_color"), "set_background_color", "get_background_color");

	ClassDB::bind_method(D_METHOD("get_margin"), &VoxelLibraryMerger::get_margin);
	ClassDB::bind_method(D_METHOD("set_margin", "size"), &VoxelLibraryMerger::set_margin);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "margin"), "set_margin", "get_margin");

	ClassDB::bind_method(D_METHOD("get_voxel_surfaces"), &VoxelLibraryMerger::get_voxel_surfaces);
	ClassDB::bind_method(D_METHOD("set_voxel_surfaces"), &VoxelLibraryMerger::set_voxel_surfaces);
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "voxel_surfaces", PROPERTY_HINT_NONE, "23/19:VoxelSurfaceMerger", PROPERTY_USAGE_DEFAULT, "VoxelSurfaceMerger"), "set_voxel_surfaces", "get_voxel_surfaces");

#ifdef MODULE_PROPS_ENABLED
	ClassDB::bind_method(D_METHOD("get_props"), &VoxelLibraryMerger::get_props);
	ClassDB::bind_method(D_METHOD("set_props"), &VoxelLibraryMerger::set_props);
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "props", PROPERTY_HINT_NONE, "23/19:PropData", PROPERTY_USAGE_DEFAULT, "PropData"), "set_props", "get_props");

	ClassDB::bind_method(D_METHOD("get_prop_uv_rect", "texture"), &VoxelLibraryMerger::get_prop_uv_rect);

	ClassDB::bind_method(D_METHOD("get_prop_packer"), &VoxelLibraryMerger::get_prop_packer);
#endif

	ClassDB::bind_method(D_METHOD("_setup_material_albedo", "material_index", "texture"), &VoxelLibraryMerger::_setup_material_albedo);
}