import { PARAM_VIEW_MODE, VIEW_MODE_WHISTLE } from '../../shared/constants';

const urlChar = '[^\\s"<>\\]\\[\\(\\)]';
const urlCharEnd = urlChar.replace(/\]$/, ".,']"); // insert bad chars to end on
const imagePath = '(?:(?:\\.(?:tiff?|jpe?g|gif|png|svg|ico)|ipfs/[a-z\\d]{40,}))';
const domainPath = '(?:[-a-zA-Z0-9\\._]*[-a-zA-Z0-9])';
const urlChars = '(?:' + urlChar + '*' + urlCharEnd + ')?';

const urlSet = ({ domain = domainPath, path } = {}) => {
    // urlChars is everything but html or markdown stop chars
    return `https?://${domain}(?::\\d{2,5})?(?:[/\\?#]${urlChars}${path ? path : ''})${path ? '' : '?'}`;
};

/**
    Unless your using a 'g' (glob) flag you can store and re-use your regular expression.  Use the cache below.  If your using a glob (for example: replace all), the regex object becomes stateful and continues where it left off when called with the same string so naturally the regexp object can't be cached for long.
*/
export const any = (flags = 'i') => new RegExp(urlSet(), flags);
export const local = (flags = 'i') => new RegExp(urlSet({ domain: '(?:localhost|(?:.*\\.)?hive.blog)' }), flags);
export const remote = (flags = 'i') => new RegExp(urlSet({ domain: `(?!localhost|(?:.*\\.)?hive.blog)${domainPath}` }), flags);
export const image = (flags = 'i') => new RegExp(urlSet({ path: imagePath }), flags);
export const imageFile = (flags = 'i') => new RegExp(imagePath, flags);
// export const nonImage = (flags = 'i') => new RegExp(urlSet({path: '!' + imageFile}), flags)
// export const markDownImageRegExp = (flags = 'i') => new RegExp('\!\[[\w\s]*\]\(([^\)]+)\)', flags);

export default {
    any: any(),
    local: local(),
    remote: remote(),
    image: image(),
    imageFile: imageFile(),
};

//TODO: possible this should go somewhere else.
/**
 * Returns a new object extended from outputParams with [key] == inputParams[key] if the value is in allowedValues
 * @param outputParams
 * @param inputParams
 * @param key
 * @param allowedValues
 * @returns {*}
 */
export const addToParams = (outputParams, inputParams, key, allowedValues) => {
    const respParams = { ...outputParams };
    if (inputParams[key] && allowedValues.indexOf(inputParams[key]) > -1) {
        respParams[key] = inputParams[key];
    }
    return respParams;
};

//TODO: possible this should go somewhere else.
export const makeParams = (params, prefix) => {
    let paramsList = [];
    if (params.constructor === Array) {
        paramsList = params;
    } else {
        Object.entries(params).forEach(([key, value]) => {
            paramsList.push(`${key}=${value}`);
        });
    }
    if (paramsList.length > 0) {
        return (prefix !== false ? (typeof prefix === 'string' ? prefix : '?') : '') + paramsList.join('&');
    }
    return '';
};

/**
 *
 * @param {string} search - window.location.search formatted string (may omit '?')
 * @returns {string}
 */
export const determineViewMode = (search) => {
    const searchList = search.indexOf('?') === 0 ? search.substr(1).split('&') : search.split('&');
    for (let i = 0; i < searchList.length; i += 1) {
        if (searchList[i].indexOf(PARAM_VIEW_MODE) === 0) {
            if (searchList[i] == PARAM_VIEW_MODE + '=' + VIEW_MODE_WHISTLE) {
                //we only want to support known view modes.
                return VIEW_MODE_WHISTLE;
            }
            return '';
        }
    }
    return '';
};

/**
 * Returns a new object contains the parameters in a query (window.location.search)
 * @param query
 * @returns {*}
 */
export const getQueryStringParams = (query) => {
    return query
        ? (/^[?#]/.test(query) ? query.slice(1) : query).split('&').reduce((params, param) => {
              const [key, value] = param.split('=');
              params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : '';
              return params;
          }, {})
        : {};
};

// Original regex
// const urlRegex = '^(?!mailto:)(?:(?:http|https|ftp)://)(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[0-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))|localhost)(?::\\d{2,5})?(?:(/|\\?|#)[^\\s]*)?$';

// About performance
// Using exec on the same regex object requires a new regex to be created and compile for each text (ex: post).  Instead replace can be used `body.replace(remoteRe, l => {` discarding the result for better performance`}).  Re-compiling is a chrome bottleneck but did not effect nodejs.
