/// Copyright (C) 2013, Mocchi
/// License: Boost ver.1

#include "tcl.h"
#include "tk.h"
#include <string>
#include <cstdio>

extern "C" {
int Vfs_Init(Tcl_Interp *);
int Memchan_Init(Tcl_Interp *);
}

std::string read_vfs_script(const char *tarfile){
	if (!tarfile) return "";
	FILE *fp = std::fopen(tarfile, "rb");
	if (!fp) return "";

	std::string script;
	char buf[513];
	buf[512] = '\0';
	int datablocks = 0;
	long filesize = 0;
	bool add_to_script = false;
	while(!std::feof(fp)){
		if (datablocks == 0){ // header
			size_t sz = fread(buf, 512, 1, fp);
			char typeflag = buf[156];
			switch(typeflag){
				case '1': case '2': case '3': case '4': case '5': case '6': case '7':
				continue;
			}
			filesize = std::strtol(buf + 124, 0, 8);
			datablocks = (filesize + 511) / 512;
			add_to_script = (std::strstr(buf, "vfs1.3/tarvfs.tcl") != 0) || (std::strstr(buf, "vfs1.3/vfsUtils.tcl") != 0);
		}else if (add_to_script){
			size_t sz = std::fread(buf, 512, 1, fp);
			--datablocks;
			if (!add_to_script) continue;
			if (filesize < 512) buf[filesize] = '\0';
			script += buf;
			filesize -= 512;
		}else{
			std::fseek(fp, datablocks * 512, SEEK_CUR);
			datablocks = filesize = 0;
		}
	}

	std::fclose(fp);
	return script;
}

int main(int argc, char *argv[]){
	Tcl_Interp *interp = ::Tcl_CreateInterp();

	Tcl_FindExecutable(argv[0]);
	int rc;
	::Tcl_StaticPackage(interp, "Tcl", Tcl_Init, 0);
	::Tcl_StaticPackage(interp, "Tk", Tk_Init, 0);
	::Tcl_StaticPackage(interp, "vfs", Vfs_Init, 0);
	::Tcl_StaticPackage(interp, "memchan", Memchan_Init, 0);
	
	// 実行ファイルのディレクトリを取得
	std::string exedir = argv[0];
	exedir = exedir.substr(0, exedir.find_last_of('\\')+1);
	for (size_t i = 0; i < exedir.size(); ++i) if (exedir[i] == '\\') exedir[i] = '/';

	::Tcl_SetVar2(interp, "tcl_library", 0, (exedir + "lib/tcl8.5/").c_str(), TCL_GLOBAL_ONLY);

	// tarファイル をマウントするために必要なモジュール群をロード
	rc = ::Vfs_Init(interp);
	rc = ::Memchan_Init(interp);

	// tarファイル をマウントするために必要なスクリプトをtarファイルの中から見つけて取得
	std::string scr = read_vfs_script((exedir + "tcl_rt.tar").c_str());
	rc = ::Tcl_Eval(interp, scr.c_str());

	// tarファイル をマウント
	rc = ::Tcl_Eval(interp, "package require vfs::tar;");
	rc = ::Tcl_Eval(interp, "vfs::tar::Mount $tcl_library/../../tcl_rt.tar $tcl_library/../;");

	// Tcl、Tk の初期化
	rc = ::Tcl_Init(interp);
	rc = ::Tk_Init(interp);

	// デモを動かす
	Tcl_Eval(interp, "source $tcl_library/../tk8.5/demos/widget;");
	Tk_MainLoop();
	return 0;
}