// Ny Executor — Stage 1 entry (silent by default)
// Reads MIR(JSON v0) from args[0], parses minimal summary, and exits 0 on success.
// No side-effects; prints nothing unless later stages add tracing.

using "apps/selfhost-runtime/mir_loader.nyash"
using "apps/selfhost-runtime/ops_calls.nyash"
using "apps/lib/boxes/console_std.nyash"
using "apps/lib/boxes/string_std.nyash"
using "apps/lib/boxes/array_std.nyash"
using "apps/lib/boxes/map_std.nyash"

static box Main {
  main(args) {
    @path = null
    if args { if args.size() > 0 { @p = args.get(0) if p { path = p } } }
    @box_pref = "plugin"
    // parse optional args like --trace / --box-pref=ny
    if args { if args.size() > 1 {
      @i = 1
      while i < args.size() {
        @flagx = args.get(i)
        if flagx && flagx.length() > 0 {
          if flagx == "--trace" { /* handled later */ }
          else {
            @kpos = flagx.indexOf("--box-pref=")
            if kpos == 0 {
              @val = flagx.substring(11, flagx.length())
              if val == "ny" || val == "plugin" { box_pref = val }
            }
          }
        }
        i = i + 1
      }
    } }
    if !path { return 0 }

    @loader = new MirLoader()
    @sum = loader.load_summary(path)
    if !sum { return 1 }

    // Optional ad-hoc trace (development only): pass "--trace" in args
    @trace_env = "0"
    // NOTE: env access is not available inside Ny script; placeholder for future
    //       we emulate it with CLI arg for now.
    if args { if args.size() > 1 {
      @flag = args.get(1)
      if flag == "--trace" {
        @fmt = sum.get("format")
        if fmt == "v0_program" {
          @ver0 = sum.get("version")
          @kind0 = sum.get("kind")
          @blen0 = sum.get("body_len")
          print("[selfhost] v0 summary: version=" + ver0 + ", kind=" + kind0 + ", body_len=" + blen0)
          @k = loader.summarize_stmt_kinds( loader.parse_root( loader.read_file(path) ) )
          if k {
            @s = ""
            function app(name, n) { if n > 0 { if s.length() > 0 { s = s + "," } s = s + name + "=" + n } }
            app("Return", k.get("Return"))
            app("Expr", k.get("Expr"))
            app("Local", k.get("Local"))
            app("If", k.get("If"))
            app("Loop", k.get("Loop"))
            app("Break", k.get("Break"))
            app("Continue", k.get("Continue"))
            app("Try", k.get("Try"))
            app("Extern", k.get("Extern"))
            if s.length() > 0 { print("[selfhost] body stmt counts: " + s) }
          }
        } else if fmt == "harness" {
          @flen = sum.get("functions_len")
          print("[selfhost] harness summary: functions=" + flen)
        } else {
          print("[selfhost] unknown JSON format")
        }
      }
    } }

    // Initialize BoxCall policy (skeleton)
    @oc = new OpsCalls()
    oc.set_pref(box_pref)

    // Basic schema guard for v0 Program
    @fmt2 = sum.get("format")
    if fmt2 == "v0_program" {
      @ver = sum.get("version")
      @kind = sum.get("kind")
      if ver != 0 { return 2 }
      if kind != "Program" { return 3 }
    }
    return 0
  }
}