// tools/hako_parser/parser_core.hako - HakoParserCoreBox (token-based MVP)
using tools.hako_parser.tokenizer as HakoTokenizerBox

static box HakoParserCoreBox {
  // Parse .hako source into minimal AST map:
  // {
  //   uses: Array<String>,
  //   aliases: Array<{name,alias}>,
  //   boxes: Array<{name,is_static,methods:Array<{name,arity,span}>}>
  // }
  parse(text) {
    local ast = new MapBox()
    ast.set("uses", new ArrayBox())
    ast.set("aliases", new ArrayBox())
    ast.set("boxes", new ArrayBox())
    ast.set("includes", new ArrayBox())
    if text == null { return ast }

    local toks = HakoTokenizerBox.tokenize(text)
    local p = 0
    local N = toks.size()

    // Parse stream (single pass, tolerant)
    while p < N {
      local t = me._peek(toks, p, N)
      if me._eq(t, "USING") == 1 {
        // using "mod" (as Alias)?
        p = me._advance(p, N)
        local t1 = me._peek(toks, p, N)
        if me._eq(t1, "STRING") == 1 {
          local mod_name = t1.get("lexeme"); ast.get("uses").push(mod_name); p = me._advance(p, N)
          // optional: as Alias
          local t2 = me._peek(toks, p, N);
          if me._eq(t2, "AS") == 1 {
            p = me._advance(p, N)
            local t3 = me._peek(toks, p, N)
            if me._eq(t3, "IDENT") == 1 {
              local alias = t3.get("lexeme"); p = me._advance(p, N)
              local rec = new MapBox(); rec.set("name", mod_name); rec.set("alias", alias)
              ast.get("aliases").push(rec)
            }
          }
        } else {
          // tolerate malformed using; skip token
        }
        continue
      }
      if me._eq(t, "INCLUDE") == 1 {
        // include "path" (record line for diagnostics as string to keep emitter simple)
        p = me._advance(p, N)
        local s = me._peek(toks, p, N)
        if me._eq(s, "STRING") == 1 {
          local ln = s.get("line"); if ln == null { ln = 0 }
          ast.get("includes").push(me._itoa(ln)); p = me._advance(p, N)
        }
        continue
      }
      if me._eq(t, "STATIC") == 1 {
        // static box Name { methods }
        // STATIC BOX IDENT LBRACE ... RBRACE
        local save = p
        local static_tok = t
        p = me._advance(p, N) // STATIC
        local tb = me._peek(toks, p, N)
        if me._eq(tb, "BOX") == 0 { p = save + 1; continue }
        local box_tok = tb
        p = me._advance(p, N)
        local tn = me._peek(toks, p, N)
        if me._eq(tn, "IDENT") == 0 { continue }
        local box_name = tn.get("lexeme");
        local box_line = tn.get("line");
        if box_line == null { box_line = static_tok.get("line") }
        p = me._advance(p, N)
        // expect '{'
        local tl = me._peek(toks, p, N)
        if me._eq(tl, "LBRACE") == 0 { continue }
        p = me._advance(p, N)
        // register box (bool is_static, and span_line metadata)
        local b = new MapBox(); b.set("name", box_name); b.set("is_static", true); b.set("span_line", box_line); b.set("methods", new ArrayBox())
        ast.get("boxes").push(b)
        // scan until matching RBRACE (flat, tolerate nested braces count)
        local depth = 1
        while p < N && depth > 0 {
          local tk = me._peek(toks, p, N)
          if me._eq(tk, "LBRACE") == 1 { depth = depth + 1; p = me._advance(p, N); continue }
          if me._eq(tk, "RBRACE") == 1 { depth = depth - 1; p = me._advance(p, N); if depth == 0 { break } else { continue } }
          // method
          if me._eq(tk, "METHOD") == 1 {
            local mline = tk.get("line"); p = me._advance(p, N)
            local mid = me._peek(toks, p, N); if me._eq(mid, "IDENT") == 0 { continue }
            local mname = mid.get("lexeme"); p = me._advance(p, N)
            // params
            local lp = me._peek(toks, p, N); if me._eq(lp, "LPAREN") == 0 { continue } p = me._advance(p, N)
            // count commas until RPAREN (no nesting inside params for MVP)
            local arity = 0; local any = 0
            while p < N {
              local tt = me._peek(toks, p, N)
              if me._eq(tt, "RPAREN") == 1 { p = me._advance(p, N); break }
              if me._eq(tt, "COMMA") == 1 { arity = arity + 1; p = me._advance(p, N); any = 1; continue }
              // consume any token inside params
              p = me._advance(p, N); any = 1
            }
            // arity = comma count + 1 (if non-empty)
            if any == 1 { arity = arity + 1 }
            // record method
            local m = new MapBox(); m.set("name", mname); m.set("arity", arity); m.set("span", mline)
            b.get("methods").push(m)
            continue
          }
          p = me._advance(p, N)
        }
        continue
      }
      // skip unhandled token
      p = me._advance(p, N)
    }
    return ast
  }
  _peek(toks, idx, N) { if idx >= N { return null } return toks.get(idx) }
  _eq(t, kind) { if t == null { return 0 } if t.get("type") == kind { return 1 } return 0 }
  _advance(p, N) { if p < N { return p + 1 } return p }
  _itoa(n) {
    local v = 0 + n; if v == 0 { return "0" }
    local digits = "0123456789"; local out = ""; local tmp = ""
    while v > 0 { local d = v % 10; tmp = digits.substring(d,d+1) + tmp; v = v / 10 }
    out = tmp; return out
  }
}

static box HakoParserCoreMain { method main(args) { return 0 } }