// @flow
import {stringToMD5} from '../lib/crypto-utils';
import _ from 'lodash';

// this is a generic avatar
// https://www.iconfinder.com/icons/403017/anonym_avatar_default_head_person_unknown_user_icon
// license: free commercial usage
export const GENERIC_AVATAR: string = `
    data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/PjwhRE9DVFlQRSBzdmcgIFBVQkxJQyAnLS8vVzNDLy9EVEQgU1
    ZHIDEuMS8vRU4nICAnaHR0cDovL3d3dy53My5vcmcvR3JhcGhpY3MvU1ZHLzEuMS9EVEQvc3ZnMTEuZHRkJz48c3ZnIGVuYWJsZS1iYW
    NrZ3JvdW5kPSJuZXcgLTI3IDI0IDEwMCAxMDAiIGhlaWdodD0iMTAwcHgiIGlkPSJ1bmtub3duIiB2ZXJzaW9uPSIxLjEiIHZpZXdCb3
    g9Ii0yNyAyNCAxMDAgMTAwIiB3aWR0aD0iMTAwcHgiIHhtbDpzcGFjZT0icHJlc2VydmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy
    8yMDAwL3N2ZyIgeG1sbnM6c2tldGNoPSJodHRwOi8vd3d3LmJvaGVtaWFuY29kaW5nLmNvbS9za2V0Y2gvbnMiIHhtbG5zOnhsaW5rPS
    JodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIj48Zz48Zz48ZGVmcz48Y2lyY2xlIGN4PSIyMyIgY3k9Ijc0IiBpZD0iY2lyY2xlIi
    ByPSI1MCIvPjwvZGVmcz48dXNlIGZpbGw9IiNGNUVFRTUiIG92ZXJmbG93PSJ2aXNpYmxlIiB4bGluazpocmVmPSIjY2lyY2xlIi8+PGN
    saXBQYXRoIGlkPSJjaXJjbGVfMV8iPjx1c2Ugb3ZlcmZsb3c9InZpc2libGUiIHhsaW5rOmhyZWY9IiNjaXJjbGUiLz48L2NsaXBQYXR
    oPjxnIGNsaXAtcGF0aD0idXJsKCNjaXJjbGVfMV8pIj48ZGVmcz48cGF0aCBkPSJNMzYsOTUuOWMwLDQsNC43LDUuMiw3LjEsNS44Yzc
    uNiwyLDIyLjgsNS45LDIyLjgsNS45YzMuMiwxLjEsNS43LDMuNSw3LjEsNi42djkuOEgtMjd2LTkuOCAgICAgICBjMS4zLTMuMSwzLjk
    tNS41LDcuMS02LjZjMCwwLDE1LjItMy45LDIyLjgtNS45YzIuNC0wLjYsNy4xLTEuOCw3LjEtNS44YzAtNCwwLTEwLjksMC0xMC45aDI
    2QzM2LDg1LDM2LDkxLjksMzYsOTUuOXoiIGlkPSJzaG91bGRlcnMiLz48L2RlZnM+PHVzZSBmaWxsPSIjRTZDMTlDIiBvdmVyZmxvdz0
    idmlzaWJsZSIgeGxpbms6aHJlZj0iI3Nob3VsZGVycyIvPjxjbGlwUGF0aCBpZD0ic2hvdWxkZXJzXzFfIj48dXNlIG92ZXJmbG93PSJ
    2aXNpYmxlIiB4bGluazpocmVmPSIjc2hvdWxkZXJzIi8+PC9jbGlwUGF0aD48cGF0aCBjbGlwLXBhdGg9InVybCgjc2hvdWxkZXJzXzF
    fKSIgZD0iTTIzLjIsMzVjMC4xLDAsMC4xLDAsMC4yLDBjMCwwLDAsMCwwLDAgICAgICBjMy4zLDAsOC4yLDAuMiwxMS40LDJjMy4zLD
    EuOSw3LjMsNS42LDguNSwxMi4xYzIuNCwxMy43LTIuMSwzNS40LTYuMyw0Mi40Yy00LDYuNy05LjgsOS4yLTEzLjUsOS40YzAsMC0wL
    jEsMC0wLjEsMCAgICAgIGMtMC4xLDAtMC4xLDAtMC4yLDBjLTAuMSwwLTAuMSwwLTAuMiwwYzAsMC0wLjEsMC0wLjEsMGMtMy43LTAuM
    i05LjUtMi43LTEzLjUtOS40Yy00LjItNy04LjctMjguNy02LjMtNDIuNCAgICAgIGMxLjItNi41LDUuMi0xMC4yLDguNS0xMi4xYzMuM
    i0xLjgsOC4xLTIsMTEuNC0yYzAsMCwwLDAsMCwwQzIzLjEsMzUsMjMuMSwzNSwyMy4yLDM1TDIzLjIsMzV6IiBmaWxsPSIjRDRCMDhDI
    iBpZD0iaGVhZC1zaGFkb3ciLz48L2c+PC9nPjxwYXRoIGQ9Ik0yMi42LDQwYzE5LjEsMCwyMC43LDEzLjgsMjAuOCwxNS4xYzEuMSwxM
    S45LTMsMjguMS02LjgsMzMuN2MtNCw1LjktOS44LDguMS0xMy41LDguMyAgICBjLTAuMiwwLTAuMiwwLTAuMywwYy0wLjEsMC0wLjEs
    MC0wLjIsMEMxOC44LDk2LjgsMTMsOTQuNiw5LDg4LjdjLTMuOC01LjYtNy45LTIxLjgtNi44LTMzLjhDMi4zLDUzLjcsMy41LDQwLDIyL
    jYsNDB6IiBmaWxsPSIjRjJDRUE1IiBpZD0iaGVhZCIvPjwvZz48L3N2Zz4=`;

/**
 * Generate gravatar url from email address
 */
export function generateGravatarUrl(email: string = '', online: boolean = true): string {
  if (online) {
    if (_.isString(email) && _.size(email) > 0) {
      email = email.trim().toLocaleLowerCase();
      const emailMD5 = stringToMD5(email);
      return `https://www.gravatar.com/avatar/${emailMD5}`;
    }
    return GENERIC_AVATAR;
  } else {
    return GENERIC_AVATAR;
  }
}