/* global getRegExp */
var regExpWidth = getRegExp('{width}', 'g');
var regExpHeight = getRegExp('{height}', 'g');
var regExpMode = getRegExp('{mode}', 'g');
var regExpQg = getRegExp('/q/d+', 'g');
var regExpQ = getRegExp('/q/d+');
var regExpQuality = getRegExp('/quality/d+');
var regExpQualityg = getRegExp('/quality/d+', 'g');
var regExpImageView = getRegExp('imageView');
var regExpImageMogr = getRegExp('imageMogr');

var defaultQuality = 75;

function image(imgUrl, w, h, mode, q) {
  var urls,
    query,
    url;

  var params = {
    w: w,
    h: h,
    mode: mode || 2,
    q: q || defaultQuality
  };

  if (imgUrl && (typeof imgUrl === 'string')) {
    urls = imgUrl.split('?');
    query = urls[1] || '';
    url = urls[0];

    if (url.indexOf('http:') === 0) {
      url = url.replace('http:', 'https:');
    }

    if (!query || query === 'imageslim') {
      url += params.q === defaultQuality ? '?imageslim' : '?imageView2/0/interlace/1/q/' + params.q;
      imgUrl = url;
    } else {
      imgUrl = imgUrl.replace(regExpWidth, params.w)
        .replace(regExpHeight, params.h)
        .replace(regExpMode, (params.mode));

      if (regExpImageView.test(query)) { // imageView2 || imageView
        if (!regExpQ.test(query)) {
          imgUrl += '/q/' + params.q;
        } else {
          imgUrl = imgUrl.replace(regExpQg, '/q/' + params.q);
        }
      } else if (regExpImageMogr.test(query)) {
        if (!regExpQuality.test(query)) {
          imgUrl += '/quality/' + params.q;
        } else {
          imgUrl = imgUrl.replace(regExpQualityg, '/quality/' + params.q);
        }
      }
    }
    return imgUrl;
  } else {
    return '';
  }
}

function round(num, precision) {
  num = +num;

  if (num !== 0 && (!num || isNaN(num))) {
    return '';
  }

  precision = precision > 0 ? precision.toFixed() : 2;

  return num.toFixed(precision);
}

// 如果图片没有imageView2，则默认添加imageView2
function imgView(imgSrc, w, h, mode, q) {
  var imgUrl = imgSrc || '';
  var indexOf = imgUrl.indexOf('?');

  if (!imgUrl) {
    return '';
  }

  if (imgUrl.indexOf('http://') === imgUrl.indexOf('https://')) {
    return imgUrl;
  }

  if (indexOf === -1) {
    imgUrl += '?imageView2/{mode}/w/{width}/h/{height}';
    return image(imgUrl, w, h, mode, q);
  }

  if (indexOf > -1) {
    return image(imgUrl, w, h, mode, q);
  }

  return imgUrl;
}

function dateFormat(times, format) {
  // ios 日期格式为2017/05/06 12:10:30
  var date = times ? getDate(times.replace(getRegExp('-', 'g'), '/')) : getDate();
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  var day = date.getDate();

  var hour = date.getHours();
  var minute = date.getMinutes();
  var second = date.getSeconds();

  format = format || 'YYYY/MM/DD HH:mm:ss';
  [year, month, day, hour, minute, second] = [year, month, day, hour, minute, second].map(function(n) {
    n = n.toString();
    return n[1] ? n : '0' + n;
  });

  return format.replace('YYYY', year).replace('MM', month).replace('DD', day)
    .replace('HH', hour).replace('mm', minute).replace('ss', second);
}

module.exports = {
  dateFormat: dateFormat,
  image: image,
  imgView: imgView,
  round: round
};