// Phase 74-SSA: Enhanced reproduction - closer to ParserBox pattern
// Goal: Reproduce ValueId undef with more realistic conditions
//
// Added features:
// 1. State fields (like ParserBox.gpos, usings_json)
// 2. using statement (like ParserBox uses sh_core)
// 3. Multiple methods (not just one delegation)
// 4. Method with loop (like ParserBox.trim)

static box TargetBox {
  is_digit(ch) {
    if ch >= "0" && ch <= "9" { return 1 }
    return 0
  }

  skip_ws(str, i) {
    local n = str.length()
    loop(i < n) {
      local ch = str.substring(i, i + 1)
      if ch == " " || ch == "\t" || ch == "\n" { i = i + 1 } else { break }
    }
    return i
  }

  trim(s) {
    if s == null { return "" }
    local str = "" + s
    local n = str.length()
    local b = TargetBox.skip_ws(str, 0)
    if b >= n { return "" }
    local e = n
    loop(e > b) {
      local ch = str.substring(e - 1, e)
      if ch == " " || ch == "\t" { e = e - 1 } else { break }
    }
    if e > b { return str.substring(b, e) }
    return ""
  }
}

box DelegateBox {
  // State fields (like ParserBox)
  gpos
  data

  birth() {
    me.gpos = 0
    me.data = ""
    return 0
  }

  // Method with loop + delegation (like ParserBox.trim)
  trim(s) {
    // Phase 74-SSA: This delegation pattern should cause SSA undef
    return TargetBox.trim(s)
  }

  // Simple delegation (like ParserBox.is_digit)
  is_digit(ch) {
    return TargetBox.is_digit(ch)
  }

  // Method that uses state + delegation
  process(text) {
    local t = me.trim(text)
    me.data = t
    return t
  }
}

box Main {
  main() {
    local delegate = new DelegateBox()

    // Test delegation through instance
    local text = "  hello  "
    local trimmed = delegate.trim(text)

    // Test is_digit delegation
    local ch = "7"
    local d = delegate.is_digit(ch)

    // Test combined (state + delegation)
    local result = delegate.process("  world  ")

    // Use results to avoid dead code elimination
    if trimmed.length() > 0 && d == 1 && result.length() > 0 {
      return 0
    }
    return 1
  }
}