contract BiddingExample{

  function onCreate(arg) {
    Global.owner = requester;
    Global.bids = [];
    Global.base_price = -1;
    Global.winner = null;
    Global.best_price = -1;
    Global.second_price = -1;
  }

  export function getOwner(arg) {
    return Global.owner;
  }

  export function bid(arg) {
    var args = JSON.parse(arg);
    for (var i = 0; i < Global.bids.length; i++) {
      if (Global.bids[i]["bidder"] == requester) {
        Global.bids[i] = {"bidder":requester, "price":args["price"]};
        return "Success";
      }
    }
    Global.bids.push({"bidder":requester, "price":args["price"]});
    return "Success";
  }

  export function set_base_price(arg) {
    if (requester != Global.owner) {
      return "Access Denied";
    }
    var args = JSON.parse(arg);
    Global.base_price = args["price"];
    return "Success";
  }
  
  export function decideWinner(arg) {
    if (requester != Global.owner) {
      return "Access Denied";
    }    
    for (var i = 0; i < Global.bids.length; i++) {
      if (Global.bids[i]["price"] < Global.base_price) {
        continue;
      } else if (Global.bids[i]["price"] > Global.best_price) {
        Global.second_price = Global.best_price;
        Global.best_price = Global.bids[i]["price"];
        Global.winner = Global.bids[i]["bidder"];
      } else if (Global.bids[i]["price"] > Global.second_price){
        Global.second_price = Global.bids[i]["price"];
      }
    }
    return "Success";
  }
  
  @Cost({"countGas":true,"extraGas":"get_final_price"})
  export function execute(arg) {
    if (requester != Global.winner) {
      return "Access Denied";
    }
    Global.bids = [];
    Global.winner = null;
    Global.best_price = -1;
    Global.second_price = -1;
    a=1+1;
    return a;
  }
  
  export function get_final_price() {
    if (requester != Global.winner) {
      return 0;
    } else {
      if (Global.second_price == -1) {
        return Global.base_price
      } else {
        return Global.second_price;
      }
    }
  }

}