/*************************************************************************/
/*  file_access_pack.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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 "file_access_pack.h"
#include "version.h"

#include <stdio.h>

#define PACK_VERSION 1

Error PackedData::add_pack(const String& p_path) {

	for (int i=0; i<sources.size(); i++) {

		if (sources[i]->try_open_pack(p_path)) {

			return OK;
		};
	};

	return ERR_FILE_UNRECOGNIZED;
};

void PackedData::add_path(const String& pkg_path, const String& path, uint64_t ofs, uint64_t size,const uint8_t* p_md5, PackSource* p_src) {

	PathMD5 pmd5(path.md5_buffer());
	//printf("adding path %ls, %lli, %lli\n", path.c_str(), pmd5.a, pmd5.b);

	bool exists = files.has(pmd5);

	PackedFile pf;
	pf.pack=pkg_path;
	pf.offset=ofs;
	pf.size=size;
	for(int i=0;i<16;i++)
		pf.md5[i]=p_md5[i];
	pf.src = p_src;

	files[pmd5]=pf;

	if (!exists) {
		//search for dir
		String p = path.replace_first("res://","");
		PackedDir *cd=root;

		if (p.find("/")!=-1) { //in a subdir

			Vector<String> ds=p.get_base_dir().split("/");

			for(int j=0;j<ds.size();j++) {

				if (!cd->subdirs.has(ds[j])) {

					PackedDir *pd = memnew( PackedDir );
					pd->name=ds[j];
					pd->parent=cd;
					cd->subdirs[pd->name]=pd;
					cd=pd;
				} else {
					cd=cd->subdirs[ds[j]];
				}
			}
		}
		cd->files.insert(path.get_file());
	}
}

void PackedData::add_pack_source(PackSource *p_source) {

	if (p_source != NULL) {
		sources.push_back(p_source);
	}
};

PackedData *PackedData::singleton=NULL;

PackedData::PackedData() {

	singleton=this;
	root=memnew(PackedDir);
	root->parent=NULL;
	disabled=false;

	add_pack_source(memnew(PackedSourcePCK));
}

void PackedData::_free_packed_dirs(PackedDir *p_dir) {

	for (Map<String,PackedDir*>::Element *E=p_dir->subdirs.front();E;E=E->next())
		_free_packed_dirs(E->get());
	memdelete(p_dir);
}

PackedData::~PackedData() {

	for(int i=0;i<sources.size();i++) {
		memdelete(sources[i]);
	}
	_free_packed_dirs(root);
}


//////////////////////////////////////////////////////////////////

bool PackedSourcePCK::try_open_pack(const String& p_path) {

	FileAccess *f = FileAccess::open(p_path,FileAccess::READ);
	if (!f)
		return false;

	//printf("try open %ls!\n", p_path.c_str());

	uint32_t magic= f->get_32();

	if (magic != 0x43504447) {
		//maybe at he end.... self contained exe
		f->seek_end();
		f->seek( f->get_pos() -4 );
		magic = f->get_32();
		if (magic != 0x43504447) {

			memdelete(f);
			return false;
		}
		f->seek( f->get_pos() -12 );


		uint64_t ds = f->get_64();
		f->seek( f->get_pos() -ds-8 );

		magic = f->get_32();
		if (magic != 0x43504447) {

			memdelete(f);
			return false;
		}

	}

	uint32_t version = f->get_32();
	uint32_t ver_major = f->get_32();
	uint32_t ver_minor = f->get_32();
	uint32_t ver_rev = f->get_32();

	ERR_EXPLAIN("Pack version unsupported: "+itos(version));
	ERR_FAIL_COND_V( version != PACK_VERSION, ERR_INVALID_DATA);
	ERR_EXPLAIN("Pack created with a newer version of the engine: "+itos(ver_major)+"."+itos(ver_minor)+"."+itos(ver_rev));
	ERR_FAIL_COND_V( ver_major > VERSION_MAJOR || (ver_major == VERSION_MAJOR && ver_minor > VERSION_MINOR), ERR_INVALID_DATA);

	for(int i=0;i<16;i++) {
		//reserved
		f->get_32();
	}

	int file_count = f->get_32();

	for(int i=0;i<file_count;i++) {

		uint32_t sl = f->get_32();
		CharString cs;
		cs.resize(sl+1);
		f->get_buffer((uint8_t*)cs.ptr(),sl);
		cs[sl]=0;

		String path;
		path.parse_utf8(cs.ptr());

		uint64_t ofs = f->get_64();
		uint64_t size = f->get_64();
		uint8_t md5[16];
		f->get_buffer(md5,16);
		PackedData::get_singleton()->add_path(p_path, path, ofs, size, md5,this);
	};

	return true;
};

FileAccess* PackedSourcePCK::get_file(const String &p_path, PackedData::PackedFile* p_file) {

	return memnew( FileAccessPack(p_path, *p_file));
};

//////////////////////////////////////////////////////////////////


Error FileAccessPack::_open(const String& p_path, int p_mode_flags) {

	ERR_FAIL_V(ERR_UNAVAILABLE);
	return ERR_UNAVAILABLE;
}

void FileAccessPack::close() {

	f->close();
}

bool FileAccessPack::is_open() const{

	return f->is_open();
}

void FileAccessPack::seek(size_t p_position){

	if (p_position>pf.size) {
		eof=true;
	} else {
		eof=false;
	}

	f->seek(pf.offset+p_position);
	pos=p_position;
}
void FileAccessPack::seek_end(int64_t p_position){

	seek(pf.size+p_position);

}
size_t FileAccessPack::get_pos() const {

	return pos;
}
size_t FileAccessPack::get_len() const{

	return pf.size;
}

bool FileAccessPack::eof_reached() const{

	return eof;
}

uint8_t FileAccessPack::get_8() const {

	if (pos>=pf.size) {
		eof=true;
		return 0;
	}

	pos++;
	return f->get_8();
}


int FileAccessPack::get_buffer(uint8_t *p_dst,int p_length) const {

	if (eof)
		return 0;

	int64_t to_read=p_length;
	if (to_read+pos > pf.size) {
		eof=true;
		to_read=int64_t(pf.size)-int64_t(pos);
	}

	pos+=p_length;

	if (to_read<=0)
		return 0;
	f->get_buffer(p_dst,to_read);

	return to_read;
}

void FileAccessPack::set_endian_swap(bool p_swap) {
	FileAccess::set_endian_swap(p_swap);
	f->set_endian_swap(p_swap);
}

Error FileAccessPack::get_error() const {

	if (eof)
		return ERR_FILE_EOF;
	return OK;
}

void FileAccessPack::store_8(uint8_t p_dest) {

	ERR_FAIL();

}

void FileAccessPack::store_buffer(const uint8_t *p_src,int p_length) {

	ERR_FAIL();

}

bool FileAccessPack::file_exists(const String& p_name) {

	return false;
}


FileAccessPack::FileAccessPack(const String& p_path, const PackedData::PackedFile& p_file) {

	pf=p_file;
	f=FileAccess::open(pf.pack,FileAccess::READ);
	if (!f) {
		ERR_EXPLAIN("Can't open pack-referenced file: "+String(pf.pack));
		ERR_FAIL_COND(!f);
	}
	f->seek(pf.offset);
	pos=0;
	eof=false;
}

FileAccessPack::~FileAccessPack() {
	if (f)
		memdelete(f);
}


//////////////////////////////////////////////////////////////////////////////////
// DIR ACCESS
//////////////////////////////////////////////////////////////////////////////////


Error DirAccessPack::list_dir_begin() {


	list_dirs.clear();
	list_files.clear();

	for (Map<String,PackedData::PackedDir*>::Element *E=current->subdirs.front();E;E=E->next()) {

		list_dirs.push_back(E->key());
	}

	for (Set<String>::Element *E=current->files.front();E;E=E->next()) {

		list_files.push_back(E->get());
	}

	return OK;
}

String DirAccessPack::get_next(){

	if (list_dirs.size()) {
		cdir=true;
		String d = list_dirs.front()->get();
		list_dirs.pop_front();
		return d;
	} else if (list_files.size()) {
		cdir=false;
		String f = list_files.front()->get();
		list_files.pop_front();
		return f;
	} else {
		return String();
	}
}
bool DirAccessPack::current_is_dir() const{

	return cdir;
}
bool DirAccessPack::current_is_hidden() const{

	return false;
}
void DirAccessPack::list_dir_end() {

	list_dirs.clear();
	list_files.clear();
}

int DirAccessPack::get_drive_count() {

	return 0;
}
String DirAccessPack::get_drive(int p_drive) {

	return "";
}

Error DirAccessPack::change_dir(String p_dir) {

	String nd = p_dir.replace("\\","/");
	bool absolute=false;
	if (nd.begins_with("res://")) {
		nd=nd.replace_first("res://","");
		absolute=true;
	}

	nd=nd.simplify_path();

	if (nd == "") nd = ".";

	if (nd.begins_with("/")) {
		nd=nd.replace_first("/","")	;
		absolute=true;
	}

	Vector<String> paths = nd.split("/");

	PackedData::PackedDir *pd;

	if (absolute)
		pd = PackedData::get_singleton()->root;
	else
		pd = current;

	for(int i=0;i<paths.size();i++) {

		String p = paths[i];
		if (p==".") {
			continue;
		} else if (p=="..") {
			if (pd->parent) {
				pd=pd->parent;
			}
		} else if (pd->subdirs.has(p)) {

			pd=pd->subdirs[p];

		} else {

			return ERR_INVALID_PARAMETER;
		}
	}

	current=pd;

	return OK;


}

String DirAccessPack::get_current_dir() {

	String p;
	PackedData::PackedDir *pd = current;
	while(pd->parent) {

		if (pd!=current)
			p="/"+p;
		p=p+pd->name;
	}

	return "res://"+p;

}

bool DirAccessPack::file_exists(String p_file){

	return current->files.has(p_file);
}

bool DirAccessPack::dir_exists(String p_dir) {

	return current->subdirs.has(p_dir);
}

Error DirAccessPack::make_dir(String p_dir){

	return ERR_UNAVAILABLE;
}

Error DirAccessPack::rename(String p_from, String p_to){

	return ERR_UNAVAILABLE;

}
Error DirAccessPack::remove(String p_name){

	return ERR_UNAVAILABLE;

}

size_t DirAccessPack::get_space_left(){

	return 0;
}

DirAccessPack::DirAccessPack() {

	current=PackedData::get_singleton()->root;
	cdir=false;
}

DirAccessPack::~DirAccessPack() {


}