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'use strict';

import utils from '../utils.js';
import parseHeaders from '../helpers/parseHeaders.js';

const $internals = Symbol('internals');

function normalizeHeader(header) {
  return header && String(header).trim().toLowerCase();
}

function normalizeValue(value) {
  if (value === false || value == null) {
    return value;
  }

return utils.isArray(value) ? value.map(normalizeValue) : String(value);
}

function parseTokens(str) {
  const tokens = Object.create(null);
  const tokensRE = /([^\s,;=]+)\s*(?:=\s*([^,;]+))?/g;
  let match;

while ((match = tokensRE.exec(str))) {
    tokens[match[1]] = match[2];
  }

return tokens;
}

function isValidHeaderName(str) {
  return /^[-_a-zA-Z]+$/.test(str.trim());
}

function matchHeaderValue(context, value, header, filter, isHeaderNameFilter) {
  if (utils.isFunction(filter)) {
    return filter.call(this, value, header);
  }

if (isHeaderNameFilter) {
    value = header;
  }

if (!utils.isString(value)) return;

if (utils.isString(filter)) {
    return value.indexOf(filter) !== -1;
  }

if (utils.isRegExp(filter)) {
    return filter.test(value);
  }
}

function formatHeader(header) {
  return header.trim()
    .toLowerCase().replace(/([a-z\d])(\w*)/g, (w, char, str) => {
      return char.toUpperCase() + str;
    });
}

function buildAccessors(obj, header) {
  const accessorName = utils.toCamelCase(' ' + header);

['get', 'set', 'has'].forEach(methodName => {
    Object.defineProperty(obj, methodName + accessorName, {
      value: function(arg1, arg2, arg3) {
        return this[methodName].call(this, header, arg1, arg2, arg3);
      },
      configurable: true
    });
  });
}

class AxiosHeaders {
  constructor(headers) {
    headers && this.set(headers);
  }

set(header, valueOrRewrite, rewrite) {
    const self = this;

function setHeader(_value, _header, _rewrite) {
      const lHeader = normalizeHeader(_header);

if (!lHeader) {
        throw new Error('header name must be a non-empty string');
      }

const key = utils.findKey(self, lHeader);

if(!key || self[key] === undefined || _rewrite === true || (_rewrite === undefined && self[key] !== false)) {
        self[key || _header] = normalizeValue(_value);
      }
    }

const setHeaders = (headers, _rewrite) =>
      utils.forEach(headers, (_value, _header) => setHeader(_value, _header, _rewrite));

if (utils.isPlainObject(header) || header instanceof this.constructor) {
      setHeaders(header, valueOrRewrite)
    } else if(utils.isString(header) && (header = header.trim()) && !isValidHeaderName(header)) {
      setHeaders(parseHeaders(header), valueOrRewrite);
    } else {
      header != null && setHeader(valueOrRewrite, header, rewrite);
    }

return this;
  }

get(header, parser) {
    header = normalizeHeader(header);

if (header) {
      const key = utils.findKey(this, header);

if (key) {
        const value = this[key];

if (!parser) {
          return value;
        }

if (parser === true) {
          return parseTokens(value);
        }

if (utils.isFunction(parser)) {
          return parser.call(this, value, key);
        }

if (utils.isRegExp(parser)) {
          return parser.exec(value);
        }

throw new TypeError('parser must be boolean|regexp|function');
      }
    }
  }

has(header, matcher) {
    header = normalizeHeader(header);

if (header) {
      const key = utils.findKey(this, header);

return !!(key && this[key] !== undefined && (!matcher || matchHeaderValue(this, this[key], key, matcher)));
    }

return false;
  }

delete(header, matcher) {
    const self = this;
    let deleted = false;

function deleteHeader(_header) {
      _header = normalizeHeader(_header);

if (_header) {
        const key = utils.findKey(self, _header);

if (key && (!matcher || matchHeaderValue(self, self[key], key, matcher))) {
          delete self[key];

deleted = true;
        }
      }
    }

if (utils.isArray(header)) {
      header.forEach(deleteHeader);
    } else {
      deleteHeader(header);
    }

return deleted;
  }

clear(matcher) {
    const keys = Object.keys(this);
    let i = keys.length;
    let deleted = false;

while (i--) {
      const key = keys[i];
      if(!matcher || matchHeaderValue(this, this[key], key, matcher, true)) {
        delete this[key];
        deleted = true;
      }
    }

return deleted;
  }

normalize(format) {
    const self = this;
    const headers = {};

utils.forEach(this, (value, header) => {
      const key = utils.findKey(headers, header);

if (key) {
        self[key] = normalizeValue(value);
        delete self[header];
        return;
      }

const normalized = format ? formatHeader(header) : String(header).trim();

if (normalized !== header) {
        delete self[header];
      }

self[normalized] = normalizeValue(value);

headers[normalized] = true;
    });

return this;
  }

concat(...targets) {
    return this.constructor.concat(this, ...targets);
  }

toJSON(asStrings) {
    const obj = Object.create(null);

utils.forEach(this, (value, header) => {
      value != null && value !== false && (obj[header] = asStrings && utils.isArray(value) ? value.join(', ') : value);
    });

return obj;
  }

[Symbol.iterator]() {
    return Object.entries(this.toJSON())[Symbol.iterator]();
  }

toString() {
    return Object.entries(this.toJSON()).map(([header, value]) => header + ': ' + value).join('\n');
  }

get [Symbol.toStringTag]() {
    return 'AxiosHeaders';
  }

static from(thing) {
    return thing instanceof this ? thing : new this(thing);
  }

static concat(first, ...targets) {
    const computed = new this(first);

targets.forEach((target) => computed.set(target));

return computed;
  }

static accessor(header) {
    const internals = this[$internals] = (this[$internals] = {
      accessors: {}
    });

const accessors = internals.accessors;
    const prototype = this.prototype;

function defineAccessor(_header) {
      const lHeader = normalizeHeader(_header);

if (!accessors[lHeader]) {
        buildAccessors(prototype, _header);
        accessors[lHeader] = true;
      }
    }

utils.isArray(header) ? header.forEach(defineAccessor) : defineAccessor(header);

return this;
  }
}

AxiosHeaders.accessor(['Content-Type', 'Content-Length', 'Accept', 'Accept-Encoding', 'User-Agent', 'Authorization']);

utils.freezeMethods(AxiosHeaders.prototype);
utils.freezeMethods(AxiosHeaders);

export default AxiosHeaders;