// Os & Time - System and time utilities
import Std::Io::{PrintLine, PrintInt, PrintInt64};
import Std::Os::{Os_ArgsCount, Os_Args, Os_GetEnv, Os_GetCwd};
import Std::Time::{Time_NowMs, Time_SleepMs};

func Main() -> int {
    PrintLine("=== OS Demo ===");
    Print("Current directory: ");
    PrintLine(Os_GetCwd());
    
    Print("Command-line args: ");
    PrintInt(Os_ArgsCount());
    PrintLine("");
    
    Print("HOME env: ");
    PrintLine(Os_GetEnv("HOME"));
    
    PrintLine("\n=== Time Demo ===");
    let start: int64 = Time_NowMs();
    Print("Start: ");
    PrintInt64(start);
    PrintLine(" ms");
    
    PrintLine("Sleeping 150ms...");
    Time_SleepMs(150);
    
    let end: int64 = Time_NowMs();
    Print("End: ");
    PrintInt64(end);
    PrintLine(" ms");
    
    Print("Elapsed: ");
    PrintInt64(end - start);
    PrintLine(" ms");
    
    return 0;
}