var fs = require('fs');
var iconv = require('iconv-lite');
var metaClasses = [];

const MT_WEB3SERVEWR = 0;
const MT_CONTRACT = 1;

function registerMetaClass(fileName, idx, primKey)
{
  metaClasses.push({
    'fileName' : fileName,
    'idx' : idx,
    'primKey' : primKey,
    'rawList' : [],
    'nameHash' : {},
    'idHash' : {},
  });
}

function load()
{
  metaClasses.forEach(function (meta) {
    let jsondata = fs.readFileSync(meta['fileName'], "utf8");
    let data = JSON.parse(jsondata);
  });
}

function init()
{
  registerMetaClass('web3server.json',
                    MT_WEB3SERVEWR,
                    ''
                    );
  registerMetaClass('contract.json',
                    MT_CONTRACT,
                    'name',
                    );
  load();
}

function unInit()
{

}

function getMetaClass(metaIdx)
{
  return metaIdx >= 0 && metaIdx < metaClasses.length ? metaClasses[metaIdx] : null;
}

function getMetaByName(metaIdx, name)
{
  let metaClass = getMetaClass[metaIdx];
  return metaClass && name in metaClass['nameHash'] ? metaClass['nameHash'][name] : null;
}

function getMetaById(metaIdx, id)
{
  let metaClass = getMetaClass[metaIdx];
  return metaClass && id in metaClass['idHash'] ? metaClass['idHash'][id] : null;
}

function getMetaList(metaIdx)
{
  let metaClass = getMetaClass[metaIdx];
  return metaClass ? metaClass['rawList'] : null;
}

exports.init = init;
exports.unInit = unInit;
exports.getMetaByName = getMetaByName;
exports.getMetaById = getMetaById;
exports.getMetaList = getMetaList;