import { SEQUENCE_PREFIX, RESET_HASH_PREFIX, DEBUG_RESET_CLASSES, SEQUENCE_SIZE, DEFINITION_LOOKUP_TABLE, LOOKUP_DEFINITIONS_INDEX, LOOKUP_DIR_INDEX } from './constants.esm.js';
import { hashSequence } from './runtime/utils/hashSequence.esm.js';
import { reduceToClassName } from './runtime/reduceToClassNameForSlots.esm.js';

// Contains a mapping of previously resolved sequences of atomic classnames
const mergeClassesCachedResults = {};
function mergeClasses() {
  // arguments are parsed manually to avoid double loops as TS & Babel transforms rest via an additional loop
  // @see https://babeljs.io/docs/en/babel-plugin-transform-parameters
  /* eslint-disable prefer-rest-params */
  let dir = null;
  let resultClassName = '';
  // Is used as a cache key to avoid object merging
  let sequenceMatch = '';
  const sequencesIds = new Array(arguments.length);
  let containsResetClassName = '';
  for (let i = 0; i < arguments.length; i++) {
    const className = arguments[i];
    if (typeof className === 'string' && className !== '') {
      // All classes generated by `makeStyles()` are prefixed by a sequence hash, this allows to identify class sets
      // without parsing each className in a string
      const sequenceIndex = className.indexOf(SEQUENCE_PREFIX);
      if (sequenceIndex === -1) {
        if (process.env.NODE_ENV !== 'production') {
          className.split(' ').forEach(entry => {
            if (entry.startsWith(RESET_HASH_PREFIX) && DEBUG_RESET_CLASSES[entry]) {
              if (containsResetClassName) {
                // eslint-disable-next-line no-console
                console.error('mergeClasses(): a passed string contains multiple classes produced by makeResetStyles (' + `${className} & ${resultClassName}, this will lead to non-deterministic behavior. Learn more:` + 'https://griffel.js.org/react/api/make-reset-styles#limitations' + '\n' + `Source string: ${className}`);
              } else {
                containsResetClassName = entry;
              }
            }
          });
        }
        resultClassName += className + ' ';
      } else {
        const sequenceId = className.substr(sequenceIndex, SEQUENCE_SIZE);
        // Handles a case with mixed classnames, i.e. "ui-button ATOMIC_CLASSES"
        if (sequenceIndex > 0) {
          resultClassName += className.slice(0, sequenceIndex);
        }
        sequenceMatch += sequenceId;
        sequencesIds[i] = sequenceId;
      }
      if (process.env.NODE_ENV !== 'production') {
        if (className.indexOf(SEQUENCE_PREFIX, sequenceIndex + 1) !== -1) {
          // eslint-disable-next-line no-console
          console.error('mergeClasses(): a passed string contains multiple identifiers of atomic classes (classes that start ' + `with "${SEQUENCE_PREFIX}"), it's possible that passed classes were concatenated in a wrong way. ` + `Source string: ${className}`);
        }
      }
    }
  }
  // .slice() there allows to avoid trailing space for non-atomic classes
  // "ui-button ui-flex " => "ui-button ui-flex"
  if (sequenceMatch === '') {
    return resultClassName.slice(0, -1);
  }
  // It's safe to reuse results to avoid continuous merging as results are stable
  // "__seq1 ... __seq2 ..." => "__seq12 ..."
  const mergeClassesResult = mergeClassesCachedResults[sequenceMatch];
  if (mergeClassesResult !== undefined) {
    return resultClassName + mergeClassesResult;
  }
  const sequenceMappings = [];
  for (let i = 0; i < arguments.length; i++) {
    const sequenceId = sequencesIds[i];
    if (sequenceId) {
      const sequenceMapping = DEFINITION_LOOKUP_TABLE[sequenceId];
      if (sequenceMapping) {
        sequenceMappings.push(sequenceMapping[LOOKUP_DEFINITIONS_INDEX]);
        if (process.env.NODE_ENV !== 'production') {
          if (dir !== null && dir !== sequenceMapping[LOOKUP_DIR_INDEX]) {
            // eslint-disable-next-line no-console
            console.error(`mergeClasses(): a passed string contains an identifier (${sequenceId}) that has different direction ` + `(dir="${sequenceMapping[1] ? 'rtl' : 'ltr'}") setting than other classes. This is not supported. ` + `Source string: ${arguments[i]}`);
          }
        }
        dir = sequenceMapping[LOOKUP_DIR_INDEX];
      } else {
        if (process.env.NODE_ENV !== 'production') {
          // eslint-disable-next-line no-console
          console.error(`mergeClasses(): a passed string contains an identifier (${sequenceId}) that does not match any entry ` + `in cache. Source string: ${arguments[i]}`);
        }
      }
    }
  }
  // eslint-disable-next-line prefer-spread
  const resultClassesMap = Object.assign.apply(Object,
  // .assign() mutates the first object, we can't mutate mappings as it will produce invalid results later
  [{}].concat(sequenceMappings));
  const [atomicClasses, classesMapHash] = reduceToClassName(resultClassesMap, dir);
  // Each merge of classes generates a new sequence of atomic classes that needs to be registered
  const newSequenceHash = hashSequence(classesMapHash, dir, sequencesIds);
  const newClassName = newSequenceHash + ' ' + atomicClasses;
  mergeClassesCachedResults[sequenceMatch] = newClassName;
  DEFINITION_LOOKUP_TABLE[newSequenceHash] = [resultClassesMap, dir];
  return resultClassName + newClassName;
}

export { mergeClasses, mergeClassesCachedResults };
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