package br.ufpe.cin.if688.visitor;

import br.ufpe.cin.if688.ast.AssignStm;
import br.ufpe.cin.if688.ast.CompoundStm;
import br.ufpe.cin.if688.ast.EseqExp;
import br.ufpe.cin.if688.ast.Exp;
import br.ufpe.cin.if688.ast.ExpList;
import br.ufpe.cin.if688.ast.IdExp;
import br.ufpe.cin.if688.ast.LastExpList;
import br.ufpe.cin.if688.ast.NumExp;
import br.ufpe.cin.if688.ast.OpExp;
import br.ufpe.cin.if688.ast.PairExpList;
import br.ufpe.cin.if688.ast.PrintStm;
import br.ufpe.cin.if688.ast.Stm;
import br.ufpe.cin.if688.symboltable.IntAndTable;
import br.ufpe.cin.if688.symboltable.Table;
import br.ufpe.cin.if688.visitor.IntAndTableVisitor;

public class Interpreter implements IVisitor<Table> {
    /*
     * você deve "interpretar" o código usando Java,
     * utilizando as classes Table e IntAndTable
     * como tabelas de símbolos auxiliares;
     */
    //a=8;b=80;a=7;
    // a->7 ==> b->80 ==> a->8 ==> NIL
    private Table t;

    public Interpreter(Table t) {
        this.t = t;
    }

    @Override
    public Table visit(Stm s) {
        this.t = s.accept(this);
        return t;
    }

    @Override
    public Table visit(AssignStm s) {
        IntAndTable it = s.getExp().accept(new IntAndTableVisitor(t));
        this.t = new Table(s.getId(), it.result, it.table);
        return t;
    }

    @Override
    public Table visit(CompoundStm s) {
        // a = 512+3; print(a)
        //AssignStm --> resultado vai produzir uma tabela { a ==> 515 }
        s.getStm1().accept(this);
        s.getStm2().accept(this);
        return t;
    }

    public Table printaux(Exp e){
        IntAndTable it = e.accept(new IntAndTableVisitor(t));
        this.t = it.table;
        System.out.println(it.result);
        return t;
    }

    public void aux(ExpList el){
        if(el instanceof LastExpList){
            LastExpList le = (LastExpList) el;
            Exp e = le.getHead();
            printaux(e);
        } else {
            PairExpList pe = (PairExpList) el;
            Exp e = pe.getHead();
            printaux(e);
            aux(pe.getTail());
        }
    }

    @Override
    public Table visit(PrintStm s) {
        ExpList el = s.getExps();
        aux(el);
        return t;
    }

    @Override
    public Table visit(Exp e) {
        this.t = e.accept(this);
        return t;
    }

    @Override
    public Table visit(EseqExp e) {
        Table tb = e.getStm().accept(this);
        IntAndTable it = e.getExp().accept(new IntAndTableVisitor(tb));
        this.t.value = it.result;
        return t;
    }

    @Override
    public Table visit(IdExp e) {
        this.t.id = e.getId();
        return t;
    }

    @Override
    public Table visit(NumExp e) {
        this.t.value = e.getNum();
        return t;
    }

    @Override
    public Table visit(OpExp e) {
        IntAndTable it = e.accept(new IntAndTableVisitor(t));
        t.value = it.result;
        return t;
    }

    @Override
    public Table visit(ExpList el) {
        this.t = el.accept(this);
        return t;
    }

    @Override
    public Table visit(PairExpList el) {
        el.getHead().accept(this);
        el.getTail().accept(this);
        return t;
    }

    @Override
    public Table visit(LastExpList el) {
        el.getHead().accept(this);
        return t;
    }


}