/*******************************************************************************
 * Copyright (c) 2017 Politecnico di Torino and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution, and is available at
 * http://www.apache.org/licenses/LICENSE-2.0
 *******************************************************************************/

package mcnet.netobjs;


import java.util.ArrayList;
import java.util.List;

import com.microsoft.z3.BoolExpr;
import com.microsoft.z3.Context;
import com.microsoft.z3.DatatypeExpr;
import com.microsoft.z3.Expr;
import com.microsoft.z3.FuncDecl;
import com.microsoft.z3.IntExpr;
import com.microsoft.z3.Solver;

import mcnet.components.NetContext;
import mcnet.components.Network;
import mcnet.components.NetworkObject;

/**
 * WebClient
 */
public class PolitoWebClient extends NetworkObject{

		List<BoolExpr> constraints;
		Context ctx;
		DatatypeExpr politoWebClient;
		Network net;
		NetContext nctx;
		FuncDecl isInBlacklist;

		public PolitoWebClient(Context ctx, Object[]... args) {
			super(ctx, args);
		}

		@Override
		protected void init(Context ctx, Object[]... args) {
			this.ctx = ctx;
		    isEndHost=true;
	   		constraints = new ArrayList<BoolExpr>();
			z3Node = ((NetworkObject)args[0][0]).getZ3Node();
			politoWebClient = z3Node;
			net = (Network)args[0][1];
			nctx = (NetContext)args[0][2];
			DatatypeExpr ipServer = (DatatypeExpr) args[0][3];
			webClientRules(ipServer);
			//net.saneSend(this);
	    }

		@Override
		public DatatypeExpr getZ3Node() {
			return politoWebClient;
		}

		@Override
		protected void addConstraints(Solver solver) {
//			System.out.println("[MailClient] Installing rules.");
			BoolExpr[] constr = new BoolExpr[constraints.size()];
			solver.add(constraints.toArray(constr));
		}

	    private void webClientRules (DatatypeExpr ipServer){
	    	Expr n_0 = ctx.mkConst("PolitoWebClient_"+politoWebClient+"_n_0", nctx.node);
	    	Expr p_0 = ctx.mkConst("PolitoWebClient_"+politoWebClient+"_p_0", nctx.packet);
	    	IntExpr t_0 = ctx.mkIntConst("PolitoWebClient_"+politoWebClient+"_t_0");

	    	//Constraint1		send(politoWebClient, n_0, p, t_0) -> nodeHasAddr(politoWebClient,p.src)
			constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.send.apply(politoWebClient, n_0, p_0, t_0),
                    		(BoolExpr)nctx.nodeHasAddr.apply(politoWebClient,nctx.pf.get("src").apply(p_0))),1,null,null,null,null));

			//Constraint2		send(politoWebClient, n_0, p, t_0) -> p.origin == politoWebClient
			constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.send.apply(politoWebClient, n_0, p_0, t_0),
                    		ctx.mkEq(nctx.pf.get("origin").apply(p_0),politoWebClient)),1,null,null,null,null));

			//Constraint3		send(politoWebClient, n_0, p, t_0) -> p.orig_body == p.body
			constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.send.apply(politoWebClient, n_0, p_0, t_0),
                    		ctx.mkEq(nctx.pf.get("orig_body").apply(p_0),nctx.pf.get("body").apply(p_0))),1,null,null,null,null));

			//Constraint4		recv(n_0, politoWebClient, p, t_0) -> nodeHasAddr(politoWebClient,p.dest)
			constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.recv.apply(n_0,politoWebClient, p_0, t_0),
                    		(BoolExpr)nctx.nodeHasAddr.apply(politoWebClient,nctx.pf.get("dest").apply(p_0))),1,null,null,null,null));


			//Constraint5		This client is only able to produce HTTP requests
			//					send(politoWebClient, n_0, p, t_0) -> p.proto == HTTP_REQ
            constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.send.apply(politoWebClient, n_0, p_0, t_0),
                        ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_REQUEST))),1,null,null,null,null));

            //Constraint6		send(politoWebClient, n_0, p, t_0) -> p.dest == ipServer
            constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
                    ctx.mkImplies((BoolExpr)nctx.send.apply(politoWebClient, n_0, p_0, t_0),
                            ctx.mkEq(nctx.pf.get("dest").apply(p_0), ipServer)),1,null,null,null,null));
	    }
	}