/**
 * FortBattleInterface
 *
 * Can be used for advanced statistics for fort battles' rounds.
 *
 * Example:
 *      FortBattleInterface.RegisterHandler(123);
 *
 * Greasemonkey Example:
 *      var BattleInterfaceScript  = document.createElement('script');
 *      BattleInterfaceScript.type = 'text/javascript';
 *      BattleInterfaceScript.text = 'FortBattleInterface.RegisterHandler(123);';
 *      document.body.appendChild(BattleInterfaceScript);
 */
var FortBattleInterface = {
    /**
    * Stores all registered handlers
    */
    Handlers:           [],

    /**
    * Registers new handler
    * @param    int         FortID      ID of the fort
    * @param    function    Func        Function that will be called
    */
    RegisterHandler:    function(FortID, Func){
        // Only one handler per fort battle
        if (FortID in this.Handlers){
            alert('Only one handler per fort battle is allowed.');
            return;
        }

        // Add to hadlers list
        this.Handlers[FortID]   = Func;

        // Notify flash that we want to get logs of battle in this fort
        var obj = this.GetFlashObject(FortID);
        var OldTxt = obj.GetVariable('jsvar_ObservedBattles');
        var NewTxt = ((OldTxt == '') ? FortID : ',' + FortID)
        obj.SetVariable('jsvar_ObservedBattles',NewTxt);
    },

    /**
    * Called by flash, calls correct handler
    * @param    int         FortID      ID of the fort
    * @param    string      Log         JSON Log
    */
    RoundStarted:       function(FortID, Log){
        // Check whether handler was registered
        if (FortID in this.Handlers){
            // Call registered handler
            this.Handlers[FortID](Log);
        }
    },

    /**
    * Returns embed object for given name
    * @param    int         FortID      ID of the fort
    */
    GetFlashObject:     function(FortID){
        var BattleName  = 'flash_battle_' + FortID;
        if (window.document[BattleName]){
            return window.document[BattleName];
        }
        if (navigator.appName.indexOf("Microsoft Internet")==-1){
            if (document.embeds && document.embeds[BattleName]) { return document.embeds[BattleName]; }
        }
        else { return document.getElementById(BattleName); }
    }
};