const utils = require('./utils');
const log = require('./log');

const metaClasses = [];

const MT_WEB3SERVEWR = 0;
const MT_CONTRACT = 1;
const MT_MYSQL = 2;

function registerMetaClass(fileName, idx, primKey) {

  metaClasses.push({
    'fileName' : fileName,
    'idx' : idx,
    'primKey' : primKey,
    'rawList' : [],
    'rawHash' : {},
  });
}

function load() {
  metaClasses.forEach(function (metaClass) {
    const json = utils.readJsonFromFile(metaClass['fileName']);
    if (!json) {
      throw new Error('读取配置' + metaClass['fileName'] + '失败');
    }
    if (Array.isArray(json)) {
      metaClass['rawList'] = json;
    } else {
      metaClass['rawList'].push(json);
    }
    let idx = 0;
    metaClass['rawList'].forEach(function (item) {
      if (metaClass['primKey'] == '') {
        metaClass['rawHash'][idx] = item;
      } else {
        metaClass['rawHash'][item[metaClass['primKey']]] = item;
      }
      ++idx;
    });
    //log.debug(JSON.stringify(metaClass));
  });
}

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

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

function getMetaByKey(metaIdx, key) {
  const metaClass = getMetaClass(metaIdx);
  return metaClass && key in metaClass['rawHash'] ? metaClass['rawHash'][key] : null;
}

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

function getServerConf() {
  return getMetaByKey(MT_WEB3SERVEWR, '0');
}

function getMysqlConf() {
  return getMetaByKey(MT_MYSQL, '0');
}

function getContracts() {
  return getMetaList(MT_CONTRACT);
}

function getContractByName(name) {
  return getMetaByKey(MT_CONTRACT, name);
}

function getUserAddress() {
  const userAddress = getServerConf()['user_address'];
  return userAddress;
}

exports.init = init;
exports.getMetaByKey = getMetaByKey;
exports.getMetaList = getMetaList;
exports.getServerConf = getServerConf;
exports.getMysqlConf = getMysqlConf;
exports.getContracts = getContracts;
exports.getContractByName = getContractByName;
exports.getUserAddress = getUserAddress;