"use strict";
var _ = require('../../lodash'), E = '', SPC = ' ', HEADER_KV_SEPARATOR = ':', Property = require('./property').Property, PropertyList = require('./property-list').PropertyList, Header;
/**
 * @typedef Header.definition
 * @property {String} key The Header name (e.g: 'Content-Type')
 * @property {String} value The value of the header.
 *
 * @example <caption>Create a header</caption>
 * var Header = require('postman-collection').Header,
 *     header = new Header({
 *         key: 'Content-Type',
 *         value: 'application/xml'
 *     });
 *
 * console.log(header.toString()) // prints the string representation of the Header.
 */
_.inherit((
/**
 * Represents an HTTP header, for requests or for responses.
 *
 * @constructor
 * @extends {Property}
 *
 * @param {Header.definition|String} options - Pass the header definition as an object or the value of the header.
 * If the value is passed as a string, it should either be in `name:value` format or the second "name" parameter
 * should be used to pass the name as string
 * @param {String} [name] - optional override the header name or use when the first parameter is the header value as
 * string.
 *
 * @example <caption>Parse a string of headers into an array of Header objects</caption>
 * var Header = require('postman-collection').Header,
 *     headerString = 'Content-Type: application/json\nUser-Agent: MyClientLibrary/2.0\n';
 *
 * var rawHeaders = Header.parse(headerString);
 * console.log(rawHeaders); // [{ 'Content-Type': 'application/json', 'User-Agent': 'MyClientLibrary/2.0' }]
 *
 * var headers = rawHeaders.map(function (h) {
 *     return new Header(h);
 * });
 *
 * function assert(condition, message) {
 *       if (!condition) {
 *           message = message || "Assertion failed";
 *           if (typeof Error !== "undefined") {
 *               throw new Error(message);
 *           }
 *           throw message; //fallback
 *       }
 *       else {
 *           console.log("Assertion passed");
 *       }
 *   }
 *
 * assert(headerString.trim() === Header.unparse(headers).trim());
 */
Header = function PostmanHeader(options, name) {
    if (_.isString(options)) {
        options = _.isString(name) ? { key: name, value: options } : Header.parseSingle(options);
    }
    // this constructor is intended to inherit and as such the super constructor is required to be executed
    Header.super_.apply(this, arguments);
    this.update(options);
}), Property);
_.assign(Header.prototype, /** @lends Header.prototype */ {
    /**
     * Converts the header to a single header string.
     *
     * @returns {String}
     */
    toString: function () {
        return this.key + ': ' + this.value;
    },
    /**
     * Return the value of this header.
     *
     * @return {String}
     */
    valueOf: function () {
        return this.value;
    },
    /**
     * Assigns the given properties to the Header
     *
     * @param {Object} options
     * @todo check for allowed characters in header key-value or store encoded.
     */
    update: function (options) {
        /**
         * The header Key
         * @type {String}
         * @todo avoid headers with falsy key.
         */
        this.key = _.get(options, 'key') || E;
        /**
         * The header value
         * @type {String}
         */
        this.value = _.get(options, 'value', E);
        /**
         * Indicates whether the header was added by internal SDK operations, such as authorizing a request.
         * @type {*|boolean}
         */
        _.has(options, 'system') && (this.system = options.system);
        /**
         * Indicates whether the header should be .
         * @type {*|boolean}
         * @todo figure out whether this should be in property.js
         */
        _.has(options, 'disabled') && (this.disabled = options.disabled);
    }
});
_.assign(Header, /** @lends Header */ {
    /**
     * Defines the name of this property for internal use.
     * @private
     * @readOnly
     * @type {String}
     */
    _postman_propertyName: 'Header',
    /**
     * Specify the key to be used while indexing this object
     * @private
     * @readOnly
     * @type {String}
     */
    _postman_propertyIndexKey: 'key',
    /**
     * Specifies whether the index lookup of this property, when in a list is case insensitive or not
     * @private
     * @readOnly
     * @type {boolean}
     */
    _postman_propertyIndexCaseInsensitive: true,
    /**
     * Since each header may have multiple possible values, this is set to true.
     *
     * @private
     * @readOnly
     * @type {Boolean}
     */
    _postman_propertyAllowsMultipleValues: true,
    /**
     * Parses a multi line header string into an array of {@link Header.definition}.
     *
     * @param {String} headerString
     * @returns {Array}
     */
    parse: function (headerString) {
        var headers = [], regexes = {
            header: /^(\S+):(.*)$/gm,
            fold: /\r\n([ \t])/g,
            trim: /^\s*(.*\S)?\s*$/
        }, match = regexes.header.exec(headerString);
        headerString = headerString.toString().replace(regexes.fold, '$1');
        while (match) {
            headers.push({
                key: match[1],
                value: match[2].replace(regexes.trim, '$1')
            });
            match = regexes.header.exec(headerString);
        }
        return headers;
    },
    /**
     * Parses a single Header.
     *
     * @param {String} header
     * @returns {{key: string, value: string}}
     */
    parseSingle: function (header) {
        if (!_.isString(header)) {
            return { key: E, value: E };
        }
        var index = header.indexOf(HEADER_KV_SEPARATOR), key, value;
        (index < 0) && (index = header.length);
        key = header.substr(0, index);
        value = header.substr(index + 1);
        return {
            key: _.trim(key),
            value: _.trim(value)
        };
    },
    /**
     * Stringifies an Array or {@link PropertyList} of Headers into a single string.
     *
     * @param {Array|PropertyList<Header>} headers
     * @param {String=} separator - Specify a string for separating each header, by default, '\n', but sometimes,
     * it might be more useful to use a carriage return ('\r\n')
     * @returns {string}
     */
    unparse: function (headers, separator) {
        if (!_.isArray(headers) && !PropertyList.isPropertyList(headers)) {
            return E;
        }
        return headers.map(Header.unparseSingle).join(separator ? separator : '\n');
    },
    /**
     * Unparses a single Header.
     *
     * @param {String} header
     * @returns {String}
     */
    unparseSingle: function (header) {
        if (!_.isObject(header)) {
            return E;
        }
        return header.key + HEADER_KV_SEPARATOR + SPC + header.value;
    },
    /**
     * Check whether an object is an instance of PostmanHeader.
     *
     * @param {*} obj
     * @returns {Boolean}
     */
    isHeader: function (obj) {
        return Boolean(obj) && ((obj instanceof Header) ||
            _.inSuperChain(obj.constructor, '_postman_propertyName', Header._postman_propertyName));
    },
    /* eslint-disable jsdoc/check-param-names */
    /**
     * Create a new header instance
     *
     * @param {Header.definition|String} [value] - Pass the header definition as an object or the value of the header.
     * If the value is passed as a string, it should either be in `name:value` format or the second "name" parameter
     * should be used to pass the name as string
     * @param {String} [name] - optional override the header name or use when the first parameter is the header value as
     * string.
     * @returns {Header}
     */
    create: function () {
        var args = Array.prototype.slice.call(arguments);
        args.unshift(Header);
        return new (Header.bind.apply(Header, args))(); // eslint-disable-line prefer-spread
    }
    /* eslint-enable jsdoc/check-param-names */
});
module.exports = {
    Header: Header
};