/*

 * Ce module permet d'écouter la blockchain

 * Il maintient un tableau de hooks

 * Il vérifie l'existence d'un nouveau block toutes les 30s

 * Si un nouveau block est détecté, les hooks sont lancés un par un

 */

blockchainListener = function(){

  var _last_block       = null;

  var _last_block_hooks = [];

  function _logBlockHash(leblock, flag)

  {

    if (flag) return "logBlockHash";

    console.log('Last Block detected : '+leblock.hash);

  };

  function _isBlockNew(leblock)

  {

    return ((_last_block == null)||(_last_block.hash != leblock.hash));

  };

  function _lastBlockTrigger()

  {

    $.get( "data/getBlockInfo.php", function( data ) {

      if (_last_block_hooks.length > 0)

      {

        if (_isBlockNew(data))

        {

          if (_last_block = data != null)

          {

            _last_block_hooks.forEach(function(trigger) {

              if (trigger instanceof Function) trigger(data);

            });

          }

          _last_block = data;

        } 

      }

    }, "json" );

  };

  function _addBlockHook(addBlockHook){

    var hookname = addBlockHook(null, true);

    var flag_add = true;

    _last_block_hooks.forEach(function(trigger) {

      if (trigger instanceof Function)

      {

        var local_hookname = trigger(null, true);

        flag_add = flag_add && (local_hookname == hookname);

      }

    });    

    if (flag_add) _last_block_hooks.push(addBlockHook);

  };

  function _init(){

    _addBlockHook(_logBlockHash);

    setTimeout(_lastBlockTrigger, 30000);

  };

  return {init: _init, addBlockHook: _addBlockHook};

}();

$(document).ready(function() {

  blockchainListener.init();

});