import GolangLean.AST
import GolangLean.Env
import GolangLean.Error

namespace GolangLean

/-! # Evaluator — operational big-step interpreter over the AST.

Mirror of octive-lean's `Eval`. Monad stack `ExceptT GoError (StateT Env IO)`,
chosen for the same reason: state survives non-local control flow (defer,
panic, goroutine spawn) carried as exceptions. -/

abbrev EvalM := ExceptT GoError (StateT Env IO)

partial def evalExpr (_e : Expr) : EvalM Value :=
  throw (.notImpl "Eval.evalExpr")

partial def evalStmt (_s : Stmt) : EvalM Unit :=
  throw (.notImpl "Eval.evalStmt")

def runFile (path : String) : IO UInt32 := do
  IO.eprintln s!"golang-lean: would execute {path} (interpreter not yet implemented)"
  return 1

end GolangLean