// Os & Time - System and time utilities
import Std::Io::{PrintLine};
import Std::Os::{Os_ArgsCount, Os_Args, Os_GetEnv, Os_GetCwd};
import Std::Time::{Time_NowMs, Time_SleepMs};
import Std::Fmt::{Fmt_Fmt1, Fmt_FmtInt};

func Main() -> int {
    PrintLine("=== OS Demo ===");
    PrintLine(Fmt_Fmt1("Current directory: {0}", Os_GetCwd()));
    PrintLine(Fmt_FmtInt("Command-line args: {0}", Os_ArgsCount() as int64));
    PrintLine(Fmt_Fmt1("HOME env: {0}", Os_GetEnv("HOME")));
    
    PrintLine("\n=== Time Demo ===");
    let start: int64 = Time_NowMs();
    PrintLine(Fmt_FmtInt("Start: {0} ms", start));
    PrintLine("Sleeping 150ms...");
    Time_SleepMs(150);
    
    let end: int64 = Time_NowMs();
    PrintLine(Fmt_FmtInt("End: {0} ms", end));
    PrintLine(Fmt_FmtInt("Elapsed: {0} ms", end - start));
    
    return 0;
}