function ShopBot() {
    var npc, tickCount, town, wpArea, path,
        cycles = 0,
        cyclesText = new Text("Cycles in last minute: " + cycles, 50, 260, 2, 1),
        leadRetry = 10,
        leadTimeout = 20; // NPC move timeout in seconds

    this.mover = function (npc, path) {
        var i, j;

        for (i = 0; i < path.length; i += 2) {
            Pather.moveTo(path[i] - 3, path[i + 1] - 3);

            moveNPC(npc, path[i], path[i + 1]);

            for (j = 0; j < leadTimeout; j += 1) {
                if (getDistance(npc.x, npc.y, path[i], path[i + 1]) < 2) {
                    break;
                }

                if (j > 0 && j % leadRetry === 0) {
                    moveNPC(npc, path[i], path[i + 1]);
                }

                delay(1000);
            }

            if (j === leadTimeout) {
                return false;
            }
        }

        delay(1000);

        return true;
    };

    this.openMenu = function (npc) {
        if (npc.type !== 1) {
            throw new Error("Unit.openMenu: Must be used on NPCs.");
        }

        if (getUIFlag(0x08)) {
            return true;
        }

        var i, j;

        for (i = 0; i < 3; i += 1) {
            if (getDistance(me, npc) > 3) {
                Pather.moveToUnit(npc);
            }

            //npc.interact();
            sendPacket(1, 0x13, 4, 1, 4, npc.gid);

            for (j = 0; j < 40; j += 1) {
                if (j % 8 === 0) {
                    me.cancel();
                    delay(300);
                    //npc.interact();
                    sendPacket(1, 0x13, 4, 1, 4, npc.gid);
                }

                if (getUIFlag(0x08)) {
                    return true;
                }

                delay(25);
            }
        }

        return false;
    },

    this.shopItems = function () {
        var i, items,
            npc = getInteractedNPC();

        if (!npc) {
            return false;
        }

        for (i = 0; i < 10; i += 1) {
            delay(150);

            if (i % 2 === 0) {
                //sendPacket(1, 0x2f, 4, 1, 4, npc.gid);
                sendPacket(1, 0x38, 4, 1, 4, npc.gid, 4, 0);
            }

            if (npc.itemcount > 0) {
                //delay(200);

                break;
            }
        }

        items = npc.getItems();

        if (!items || !items.length) {
            return false;
        }

        me.overhead(items.length + " items");

        for (i = 0; i < items.length; i += 1) {
            if (Config.ShopBot.ScanIDs.indexOf(items[i].classid) > -1) {
                //print("Scanning " + items[i].name);

                if (Pickit.checkItem(items[i]).result === 1) {
                    try {
                        if (Storage.Inventory.CanFit(items[i]) && me.getStat(14) + me.getStat(15) >= items[i].getItemCost(0)) {
                            delay(1000);

                            if (npc.startTrade()) {
                                Misc.logItem("Shopped", items[i]);
                                items[i].buy();
                            }
                        }
                    } catch (e) {
                        print(e);
                    }
                }
            }
        }

        return true;
    };

    this.useWp = function (area) {
        var i, unit;

        if (me.area === area) {
            return true;
        }

        unit = getUnit(2, "Waypoint");

        if (!unit) {
            return false;
        }

        if (me.inTown) {
            me.cancel();
        }

        for (i = 0; i < 80; i += 1) {
            if (i % 20 === 0) {
                if (getDistance(me, unit) > 5) {
                    Pather.moveToUnit(unit);
                }

                unit.interact(area);
            }

            delay(75);

            if (me.area === area) {
                return true;
            }
        }

        return false;
    };

    Town.doChores();

    switch (Config.ShopBot.ShopNPC.toLowerCase()) {
    case "Ormus":
        wpArea = 101;
        town = 75;
        path = [5147, 5089, 5156, 5075, 5157, 5063, 5160, 5050];

        if (!Town.goToTown(3) || !Town.move(NPC.Ormus)) {
            throw new Error("Failed to get to NPC");
        }

        npc = getUnit(1, NPC.Ormus);

        break;

    case "anya":
        wpArea = 107;
        town = 125;
        path = [5122, 5119, 5129, 5105, 5123, 5087, 5115, 5068];

        if (!Town.goToTown(5) || !Town.move(NPC.Anya)) {
            throw new Error("Failed to get to NPC");
        }

        npc = getUnit(1, NPC.Anya);

        break;
    default:
        throw new Error("Invalid shopbot NPC.");
    }

    if (!npc) {
        throw new Error("Failed to find NPC.");
    }

    if (!this.mover(npc, path)) {
        throw new Error("Failed to move NPC");
    }

    Town.move("waypoint");

    tickCount = getTickCount();

    while (true) {
        if (getTickCount() - tickCount >= 60 * 1000) {
            cyclesText.text = "Cycles in last minute: " + cycles;
            tickCount = getTickCount();
            cycles = 0;
        }

        if (me.area === town) {
            if (this.openMenu(npc)) {
                this.shopItems();
            }

            me.cancel();
        }

        if (me.area === town) {
            this.useWp(wpArea);
        }

        if (me.area === wpArea) {
            this.useWp(town);
        }

        cycles += 1;
    }

    return true;
}