#include "resource_import.h"
#include "variant_parser.h"
#include "os/os.h"

Error ResourceFormatImporter::_get_path_and_type(const String& p_path, PathAndType &r_path_and_type) const {

	Error err;
	FileAccess *f= FileAccess::open(p_path+".import",FileAccess::READ,&err);

	if (!f)
		return err;

	VariantParser::StreamFile stream;
	stream.f=f;

	String assign;
	Variant value;
	VariantParser::Tag next_tag;

	int lines=0;
	String error_text;
	while(true) {

		assign=Variant();
		next_tag.fields.clear();
		next_tag.name=String();

		err = VariantParser::parse_tag_assign_eof(&stream,lines,error_text,next_tag,assign,value,NULL,true);
		if (err==ERR_FILE_EOF) {
			memdelete(f);
			return OK;
		}
		else if (err!=OK) {
			ERR_PRINTS("ResourceFormatImporter::load - "+p_path+".import:"+itos(lines)+" error: "+error_text);
			memdelete(f);
			return err;
		}

		if (assign!=String()) {
			if (assign.begins_with("path.") && r_path_and_type.path==String()) {
				String feature = assign.get_slicec('.',1);
				if (OS::get_singleton()->check_feature_support(feature)) {
					r_path_and_type.path=value;
				}

			} else if (assign=="path") {
				r_path_and_type.path=value;
			} else if (assign=="type") {
				r_path_and_type.type=value;
			}

		} else if (next_tag.name!="remap") {
			break;
		}
	}

	memdelete(f);

	if (r_path_and_type.path==String() || r_path_and_type.type==String()) {
		return ERR_FILE_CORRUPT;
	}
	return OK;

}


RES ResourceFormatImporter::load(const String &p_path,const String& p_original_path,Error *r_error) {

	PathAndType pat;
	Error err = _get_path_and_type(p_path,pat);

	if (err!=OK) {

		if (r_error)
			*r_error=err;

		return RES();
	}


	RES res =  ResourceLoader::load(pat.path,pat.type,false,r_error);

#ifdef TOOLS_ENABLED
	if (res.is_valid()) {
		res->set_import_last_modified_time( res->get_last_modified_time() ); //pass this, if used
		res->set_import_path(pat.path);
	}
#endif

	return res;

}

void ResourceFormatImporter::get_recognized_extensions(List<String> *p_extensions) const{

	Set<String> found;

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {
		List<String> local_exts;
		E->get()->get_recognized_extensions(&local_exts);
		for (List<String>::Element *F=local_exts.front();F;F=F->next()) {
			if (!found.has(F->get())) {
				p_extensions->push_back(F->get());
				found.insert(F->get());
			}
		}
	}
}

void ResourceFormatImporter::get_recognized_extensions_for_type(const String& p_type,List<String> *p_extensions) const{

	if (p_type=="") {
		return get_recognized_extensions(p_extensions);
	}

	Set<String> found;

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {
		String res_type = E->get()->get_resource_type();
		if (res_type==String())
			continue;

		if (!ClassDB::is_parent_class(res_type,p_type))
			continue;

		List<String> local_exts;
		E->get()->get_recognized_extensions(&local_exts);
		for (List<String>::Element *F=local_exts.front();F;F=F->next()) {
			if (!found.has(F->get())) {
				p_extensions->push_back(F->get());
				found.insert(F->get());
			}
		}
	}
}

bool ResourceFormatImporter::recognize_path(const String& p_path,const String& p_for_type) const{

	return FileAccess::exists(p_path+".import");

}

bool ResourceFormatImporter::can_be_imported(const String& p_path) const {

	return ResourceFormatLoader::recognize_path(p_path);
}


bool ResourceFormatImporter::handles_type(const String& p_type) const {

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {

		String res_type = E->get()->get_resource_type();
		if (res_type==String())
			continue;
		if (ClassDB::is_parent_class(res_type,p_type))
			return true;

	}

	return true;
}


String ResourceFormatImporter::get_internal_resource_path(const String& p_path) const {

	PathAndType pat;
	Error err = _get_path_and_type(p_path,pat);

	if (err!=OK) {

		return String();
	}

	return pat.path;
}

String ResourceFormatImporter::get_resource_type(const String &p_path) const {

	PathAndType pat;
	Error err = _get_path_and_type(p_path,pat);

	if (err!=OK) {

		return "";
	}

	return pat.type;
}

void ResourceFormatImporter::get_dependencies(const String& p_path,List<String> *p_dependencies,bool p_add_types){

	PathAndType pat;
	Error err = _get_path_and_type(p_path,pat);

	if (err!=OK) {

		return;
	}

	return ResourceLoader::get_dependencies(pat.path,p_dependencies,p_add_types);
}

Ref<ResourceImporter> ResourceFormatImporter::get_importer_by_name(const String& p_name) {

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {
		if (E->get()->get_importer_name()==p_name) {
			return E->get();
		}
	}

	return Ref<ResourceImporter>();
}


void ResourceFormatImporter::get_importers_for_extension(const String& p_extension,List<Ref<ResourceImporter> > *r_importers) {

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {
		List<String> local_exts;
		E->get()->get_recognized_extensions(&local_exts);
		for (List<String>::Element *F=local_exts.front();F;F=F->next()) {
			if (p_extension.to_lower()==F->get()) {
				r_importers->push_back(E->get());
			}
		}
	}
}

Ref<ResourceImporter> ResourceFormatImporter::get_importer_by_extension(const String& p_extension) {


	Ref<ResourceImporter> importer;
	float priority=0;

	for (Set< Ref<ResourceImporter> >::Element *E=importers.front();E;E=E->next()) {

		List<String> local_exts;
		E->get()->get_recognized_extensions(&local_exts);
		for (List<String>::Element *F=local_exts.front();F;F=F->next()) {
			if (p_extension.to_lower()==F->get() && E->get()->get_priority() > priority) {
				importer=E->get();
				priority=E->get()->get_priority();
			}
		}
	}

	return importer;
}

String ResourceFormatImporter::get_import_base_path(const String& p_for_file) const {

	return "res://.import/"+p_for_file.get_file()+"-"+p_for_file.md5_text();
}

ResourceFormatImporter *ResourceFormatImporter::singleton=NULL;

ResourceFormatImporter::ResourceFormatImporter() {
	singleton=this;
}