import './polyfill';
import {
  supportList,
  onScanListener, offScanListener,
  onScanErrorListener, offScanErrorListener,
  setStatusListener, getStatus,
  startScan, stopScan, scanImage, scanImageFromFile, clear
} from './services/provider/scan';
import { setConfig, getVersion } from './services/config';
import { initWxJssdk } from './services/wx';
import {
  isSupportWebScan,
  prepareWebScanBarcodeDetector,
  isSupportImageScan
} from './services/web';
import { printDebug, printWarn } from './utils/logger';

let _readyPromise = null;
let _calledReady = false;

export function isReadyCalled() {
  return _calledReady;
}

function config(config) {
  if (config) {
    setConfig(config);
  }
  if (_readyPromise) {
    return _readyPromise;
  }
  _readyPromise = Promise.resolve().then(() => {
    initWxJssdk().catch(err => {
      printDebug('init wx jssdk failed:', err && err.message ? err.message : err);
    });
  }).then(() => {
    printDebug('-------------------------------------');
    printDebug('sdk_version:', getVersion());
    printDebug('support_list:', supportList.map(item => item.name + ':' + item.support).join(', '));
    printDebug('-------------------------------------');
    if (isSupportWebScan() || isSupportImageScan()) {
      return prepareWebScanBarcodeDetector().catch(err => {
        printWarn('prepare barcode detector failed:', err);
      });
    }
  }).then(() => {
    _calledReady = true;
  }).catch(err => {
    _readyPromise = null;
    throw err;
  });
  return _readyPromise;
}

export default Object.assign({}, {
  config,
  onScanListener,
  offScanListener,
  onScanErrorListener,
  offScanErrorListener,
  setStatusListener,
  getStatus,
  startScan,
  stopScan,
  scanImage,
  scanImageFromFile,
  clear,
});