import createCache from '@emotion/cache';
import { serializeStyles } from '@emotion/serialize';
import { getRegisteredStyles, insertStyles } from '@emotion/utils';

function insertWithoutScoping(cache, serialized) {
  if (cache.inserted[serialized.name] === undefined) {
    return cache.insert('', serialized, cache.sheet, true);
  }
}

function merge(registered, css, className) {
  var registeredStyles = [];
  var rawClassName = getRegisteredStyles(registered, registeredStyles, className);

  if (registeredStyles.length < 2) {
    return className;
  }

  return rawClassName + css(registeredStyles);
}

var createEmotion = function createEmotion(options) {
  var cache = createCache(options); // $FlowFixMe

  cache.sheet.speedy = function (value) {
    if (process.env.NODE_ENV !== 'production' && this.ctr !== 0) {
      throw new Error('speedy must be changed before any rules are inserted');
    }

    this.isSpeedy = value;
  };

  cache.compat = true;

  var css = function css() {
    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    var serialized = serializeStyles(args, cache.registered, undefined);
    insertStyles(cache, serialized, false);
    return cache.key + "-" + serialized.name;
  };

  var keyframes = function keyframes() {
    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
      args[_key2] = arguments[_key2];
    }

    var serialized = serializeStyles(args, cache.registered);
    var animation = "animation-" + serialized.name;
    insertWithoutScoping(cache, {
      name: serialized.name,
      styles: "@keyframes " + animation + "{" + serialized.styles + "}"
    });
    return animation;
  };

  var injectGlobal = function injectGlobal() {
    for (var _len3 = arguments.length, args = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
      args[_key3] = arguments[_key3];
    }

    var serialized = serializeStyles(args, cache.registered);
    insertWithoutScoping(cache, serialized);
  };

  var cx = function cx() {
    for (var _len4 = arguments.length, args = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
      args[_key4] = arguments[_key4];
    }

    return merge(cache.registered, css, classnames(args));
  };

  return {
    css: css,
    cx: cx,
    injectGlobal: injectGlobal,
    keyframes: keyframes,
    hydrate: function hydrate(ids) {
      ids.forEach(function (key) {
        cache.inserted[key] = true;
      });
    },
    flush: function flush() {
      cache.registered = {};
      cache.inserted = {};
      cache.sheet.flush();
    },
    // $FlowFixMe
    sheet: cache.sheet,
    cache: cache,
    getRegisteredStyles: getRegisteredStyles.bind(null, cache.registered),
    merge: merge.bind(null, cache.registered, css)
  };
};

var classnames = function classnames(args) {
  var cls = '';

  for (var i = 0; i < args.length; i++) {
    var arg = args[i];
    if (arg == null) continue;
    var toAdd = void 0;

    switch (typeof arg) {
      case 'boolean':
        break;

      case 'object':
        {
          if (Array.isArray(arg)) {
            toAdd = classnames(arg);
          } else {
            toAdd = '';

            for (var k in arg) {
              if (arg[k] && k) {
                toAdd && (toAdd += ' ');
                toAdd += k;
              }
            }
          }

          break;
        }

      default:
        {
          toAdd = arg;
        }
    }

    if (toAdd) {
      cls && (cls += ' ');
      cls += toAdd;
    }
  }

  return cls;
};

export { createEmotion as default };