// Phase 74-SSA: ParserBox minimal reproduction
// Goal: Reproduce SSA undef by matching ParserBox structure
// Pattern: me.method() → delegation → static box

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

  to_int(s) {
    if s == null { return 0 }
    local str = "" + s
    local n = str.length()
    if n == 0 { return 0 }
    local neg = 0
    local i = 0
    if str.substring(0, 1) == "-" { neg = 1  i = 1 }
    local acc = 0
    loop(i < n) {
      local ch = str.substring(i, i + 1)
      if ch < "0" || ch > "9" { break }
      acc = acc * 10 + ("0123456789".indexOf(ch))
      i = i + 1
    }
    if neg == 1 { return 0 - acc }
    return acc
  }

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

box ParserBox {
  gpos
  usings_json

  birth() {
    me.gpos = 0
    me.usings_json = "[]"
    return 0
  }

  gpos_set(i) { me.gpos = i return 0 }
  gpos_get() { return me.gpos }

  // Delegation methods (Phase 71-SSA: these cause SSA undef)
  is_digit(ch) {
    return ParserStringUtilsBox.is_digit(ch)
  }

  to_int(s) {
    return ParserStringUtilsBox.to_int(s)
  }

  skip_ws(src, i) {
    return ParserStringUtilsBox.skip_ws(src, i)
  }

  // Method that uses delegation via me.method()
  parse_something(text) {
    local pos = text.lastIndexOf("@")
    if pos >= 0 {
      local num_str = text.substring(pos+1, text.length())
      // 🔥 me.to_int() → ParserBox.to_int() → ParserStringUtilsBox.to_int()
      local num = me.to_int(num_str)
      me.gpos_set(num)
      return num
    }
    return 0
  }

  // Method with loop + me delegation call
  process(text) {
    local i = 0
    local n = text.length()
    loop(i < n) {
      local ch = text.substring(i, i+1)
      if me.is_digit(ch) == 1 {  // me経由の委譲呼び出し
        break
      }
      i = i + 1
    }
    return i
  }

  // More complex method with multiple me calls
  parse_number(src, start) {
    local i = start
    local n = src.length()

    // Skip whitespace via me delegation
    i = me.skip_ws(src, i)
    if i >= n { return 0 }

    // Find number start
    local num_start = i
    loop(i < n) {
      local ch = src.substring(i, i+1)
      if me.is_digit(ch) == 1 {
        i = i + 1
        continue
      }
      break
    }

    if i > num_start {
      local num_str = src.substring(num_start, i)
      return me.to_int(num_str)  // me経由のto_int委譲
    }
    return 0
  }
}

box Main {
  main() {
    local parser = new ParserBox()

    // Test delegation via me
    local num = parser.parse_something("data@42")
    local pos = parser.process("abc123")
    local parsed = parser.parse_number("  789xyz", 0)

    if num == 42 && pos == 3 && parsed == 789 {
      return 0
    }
    return 1
  }
}