/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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 2
 * of the License, or (at your option) any later version.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

/* 
 * This code is based on Broken Sword 2.5 engine
 *
 * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
 *
 * Licensed under GNU GPL v2
 *
 */

// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------

#include "sword25/kernel/common.h"
#include "sword25/kernel/kernel.h"
#include "sword25/script/script.h"
#include "sword25/script/luabindhelper.h"

#include "sword25/package/packagemanager.h"

namespace Sword25 {

using namespace Lua;

// -----------------------------------------------------------------------------

static BS_PackageManager *GetPM() {
	BS_Kernel * pKernel = BS_Kernel::GetInstance();
	BS_ASSERT(pKernel);
	BS_PackageManager *pPM = static_cast<BS_PackageManager *>(pKernel->GetService("package"));
	BS_ASSERT(pPM);
	return pPM;
}

// -----------------------------------------------------------------------------

static int LoadPackage(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushbooleancpp(L, pPM->LoadPackage(luaL_checkstring(L, 1), luaL_checkstring(L, 2)));

	return 1;
}

// -----------------------------------------------------------------------------

static int LoadDirectoryAsPackage(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushbooleancpp(L, pPM->LoadDirectoryAsPackage(luaL_checkstring(L, 1), luaL_checkstring(L, 2)));

	return 1;
}

// -----------------------------------------------------------------------------

static int GetCurrentDirectory(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushstring(L, pPM->GetCurrentDirectory().c_str());

	return 1;
}

// -----------------------------------------------------------------------------

static int ChangeDirectory(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushbooleancpp(L, pPM->ChangeDirectory(luaL_checkstring(L, 1)));

	return 1;
}

// -----------------------------------------------------------------------------

static int GetAbsolutePath(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushstring(L, pPM->GetAbsolutePath(luaL_checkstring(L, 1)).c_str());

	return 1;
}

// -----------------------------------------------------------------------------

static int GetFileSize(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushnumber(L, pPM->GetFileSize(luaL_checkstring(L, 1)));

	return 1;
}

// -----------------------------------------------------------------------------

static int GetFileType(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	lua_pushnumber(L, pPM->GetFileType(luaL_checkstring(L, 1)));

	return 1;
}

// -----------------------------------------------------------------------------

static void SplitSearchPath(const Common::String &Path, Common::String &Directory, Common::String &Filter) {
	// Scan backwards for a trailing slash
	const char *sPath = Path.c_str();
	const char *lastSlash = sPath + strlen(sPath) - 1;
	while ((lastSlash >= sPath) && (*lastSlash != '/')) --lastSlash;

	if (lastSlash >= sPath)	{
		Directory = "";
		Filter = Path;
	} else {
		Directory = Common::String(sPath, lastSlash - sPath);
		Filter = Common::String(lastSlash + 1);
	}
}

// -----------------------------------------------------------------------------

static void DoSearch(lua_State *L, const Common::String &Path, unsigned int Type) {
	BS_PackageManager *pPM = GetPM();

	// Der Packagemanager-Service muss den Suchstring und den Pfad getrennt übergeben bekommen.
	// Um die Benutzbarkeit zu verbessern sollen Skriptprogrammierer dieses als ein Pfad übergeben können.
	// Daher muss der übergebene Pfad am letzten Slash aufgesplittet werden.
	Common::String Directory;
	Common::String Filter;
	SplitSearchPath(Path, Directory, Filter);

	// Ergebnistable auf dem Lua-Stack erstellen
	lua_newtable(L);

	// Suche durchführen und die Namen aller gefundenen Dateien in die Ergebnistabelle einfügen.
	// Als Indizes werden fortlaufende Nummern verwandt.
	unsigned int ResultNr = 1;
	BS_PackageManager::FileSearch * pFS = pPM->CreateSearch(Filter, Directory, Type);
	if (pFS) {
		do {
			lua_pushnumber(L, ResultNr);
			lua_pushstring(L, pFS->GetCurFileName().c_str());
			lua_settable(L, -3);
			ResultNr++;
		} while (pFS->NextFile());
	}

	delete(pFS);
}

// -----------------------------------------------------------------------------

static int FindFiles(lua_State *L) {
	DoSearch(L, luaL_checkstring(L, 1), BS_PackageManager::FT_FILE);
	return 1;
}

// -----------------------------------------------------------------------------

static int FindDirectories(lua_State *L) {
	DoSearch(L, luaL_checkstring(L, 1), BS_PackageManager::FT_DIRECTORY);
	return 1;
}

// -----------------------------------------------------------------------------

static int GetFileAsString(lua_State *L) {
	BS_PackageManager *pPM = GetPM();

	unsigned int FileSize;
	void * FileData = pPM->GetFile(luaL_checkstring(L, 1), &FileSize);
	if (FileData) {
		lua_pushlstring(L, static_cast<char *>(FileData), FileSize);
		delete FileData;

		return 1;
	} else
		return 0;
}

// -----------------------------------------------------------------------------

static int FileExists(lua_State *L) {
	lua_pushbooleancpp(L, GetPM()->FileExists(luaL_checkstring(L, 1)));
	return 1;
}

// -----------------------------------------------------------------------------

static const char * PACKAGE_LIBRARY_NAME = "Package";

static const luaL_reg PACKAGE_FUNCTIONS[] = {
	"LoadPackage", LoadPackage,
	"LoadDirectoryAsPackage", LoadDirectoryAsPackage,
	"GetCurrentDirectory", GetCurrentDirectory,
	"ChangeDirectory", ChangeDirectory,
	"GetAbsolutePath", GetAbsolutePath,
	"GetFileSize", GetFileSize,
	"GetFileType", GetFileType,
	"FindFiles", FindFiles,
	"FindDirectories", FindDirectories,
	"GetFileAsString", GetFileAsString,
	"FileExists", FileExists,
	0, 0
};

// -----------------------------------------------------------------------------

bool BS_PackageManager::_RegisterScriptBindings() {
	BS_Kernel * pKernel = BS_Kernel::GetInstance();
	BS_ASSERT(pKernel);
	BS_ScriptEngine * pScript = static_cast<BS_ScriptEngine *>(pKernel->GetService("script"));
	BS_ASSERT(pScript);
	lua_State *L = static_cast<lua_State *>(pScript->GetScriptObject());
	BS_ASSERT(L);

	if (!BS_LuaBindhelper::AddFunctionsToLib(L, PACKAGE_LIBRARY_NAME, PACKAGE_FUNCTIONS)) return false;

	return true;
}

} // End of namespace Sword25