/*

 * 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)

  {

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

    return true;

  };

  function _isBlockNew(leblock)

  {

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

  };

  function _getLastBlockInfo()

  {

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

      if (_last_block_hooks.length > 0)

      {

        if (_isBlockNew(data))

        {           

          _last_block = data;

          _last_block_hooks.forEach(function(trigger) {

            if (trigger instanceof Function)

              trigger(data);

            else

              console.log(trigger);

          });

        } 

      }

    }, "json" );

    setTimeout(_getLastBlockInfo, 30000);

  };

  function _addBlockHook(addBlockHook){

    _last_block_hooks.push(addBlockHook);

  };

  function _init(){

    _last_block_hooks.push(_logBlockHash);

    _getLastBlockInfo();

  };

  return {init: _init, addBlockHook: _addBlockHook};

}();

$(document).ready(function() {

  blockchainListener.init();

});