// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* eslint-disable camelcase */
/* eslint-disable no-unused-vars */

/**
 * This file contains the autocomplete configuration logic that is
 * specific to the issue fields of Monorail.  It depends on ac.js, our
 * modified version of the autocomplete library.
 */

/**
 * This is an autocomplete store that holds the hotlists of the current user.
 */
let TKR_hotlistsStore;

/**
 * This is an autocomplete store that holds well-known issue label
 * values for the current project.
 */
let TKR_labelStore;

/**
 * Like TKR_labelStore but stores only label prefixes.
 */
let TKR_labelPrefixStore;

/**
 * Like TKR_labelStore but adds a trailing comma instead of replacing.
 */
let TKR_labelMultiStore;

/**
 * This is an autocomplete store that holds issue components.
 */
let TKR_componentStore;

/**
 * Like TKR_componentStore but adds a trailing comma instead of replacing.
 */
let TKR_componentListStore;

/**
 * This is an autocomplete store that holds many different kinds of
 * items that can be shown in the artifact search autocomplete.
 */
let TKR_searchStore;

/**
 * This is similar to TKR_searchStore, but does not include any suggestions
 * to use the "me" keyword. Using "me" is not a good idea for project canned
 * queries and filter rules.
 */
let TKR_projectQueryStore;

/**
 * This is an autocomplete store that holds items for the quick edit
 * autocomplete.
 */
// TODO(jrobbins): add options for fields and components.
let TKR_quickEditStore;

/**
 * This is a list of label prefixes that each issue should only use once.
 * E.g., each issue should only have one Priority-* label.  We do not prevent
 * the user from using multiple such labels, we just warn the user before
 * they submit.
 */
let TKR_exclPrefixes = [];

/**
 * This is an autocomplete store that holds custom permission names that
 * have already been used in this project.
 */
let TKR_customPermissionsStore;


/**
 * This is an autocomplete store that holds well-known issue status
 * values for the current project.
 */
let TKR_statusStore;


/**
 * This is an autocomplete store that holds the usernames of all the
 * members of the current project.  This is used for autocomplete in
 * the cc-list of an issue, where many user names can entered with
 * commas between them.
 */
let TKR_memberListStore;


/**
 * This is an autocomplete store that holds the projects that the current
 * user is contributor/member/owner of.
 */
let TKR_projectStore;

/**
 * This is an autocomplete store that holds the usernames of possible
 * issue owners in the current project.  The list of possible issue
 * owners is the same as the list of project members, but the behavior
 * of this autocompete store is different because the issue owner text
 * field can only accept one value.
 */
let TKR_ownerStore;


/**
 * This is an autocomplete store that holds any list of string for choices.
 */
let TKR_autoCompleteStore;


/**
 * An array of autocomplete stores used for user-type custom fields.
 */
const TKR_userAutocompleteStores = [];


/**
 * This boolean controls whether odd-ball status and labels are treated as
 * a warning or an error.  Normally, it is False.
 */
// TODO(jrobbins): split this into one option for statuses and one for labels.
let TKR_restrict_to_known;

/**
 * This substitute function should be used for multi-valued autocomplete fields
 * that are delimited by commas. When we insert an autocomplete value, replace
 * an entire search term. Add a comma and a space after it if it is a complete
 * search term.
 */
function TKR_acSubstituteWithComma(inputValue, caret, completable, completion) {
  let nextTerm = caret;

  // Subtract one in case the cursor is at the end of the input, before a comma.
  let prevTerm = caret - 1;
  while (nextTerm < inputValue.length - 1 && inputValue.charAt(nextTerm) !== ',') {
    nextTerm++;
  }
  // Set this at the position after the found comma.
  nextTerm++;

  while (prevTerm > 0 && ![',', ' '].includes(inputValue.charAt(prevTerm))) {
    prevTerm--;
  }
  if (prevTerm > 0) {
    // Set this boundary after the found space/comma if it's not the beginning
    // of the field.
    prevTerm++;
  }

  return inputValue.substring(0, prevTerm) +
         completion.value + ', ' + inputValue.substring(nextTerm);
}

/**
 * When the prefix starts with '*', return the complete set of all
 * possible completions.
 * @param {string} prefix If this starts with '*', return all possible
 * completions.  Otherwise return null.
 * @param {Array} labelDefs The array of label names and docstrings.
 * @return Array of new _AC_Completions for each possible completion, or null.
 */
function TKR_fullComplete(prefix, labelDefs) {
  if (!prefix.startsWith('*')) return null;
  const out = [];
  for (let i = 0; i < labelDefs.length; i++) {
    out.push(new _AC_Completion(labelDefs[i].name,
        labelDefs[i].name,
        labelDefs[i].doc));
  }
  return out;
}


/**
 * Constucts a list of all completions for both open and closed
 * statuses, with a header for each group.
 * @param {string} prefix If starts with '*', return all possible completions,
 * else return null.
 * @param {Array} openStatusDefs The array of open status values and
 * docstrings.
 * @param {Array} closedStatusDefs The array of closed status values
 * and docstrings.
 * @return Array of new _AC_Completions for each possible completion, or null.
 */
function TKR_openClosedComplete(prefix, openStatusDefs, closedStatusDefs) {
  if (!prefix.startsWith('*')) return null;
  const out = [];
  out.push({heading: 'Open Statuses:'}); // TODO: i18n
  for (var i = 0; i < openStatusDefs.length; i++) {
    out.push(new _AC_Completion(openStatusDefs[i].name,
        openStatusDefs[i].name,
        openStatusDefs[i].doc));
  }
  out.push({heading: 'Closed Statuses:'}); // TODO: i18n
  for (var i = 0; i < closedStatusDefs.length; i++) {
    out.push(new _AC_Completion(closedStatusDefs[i].name,
        closedStatusDefs[i].name,
        closedStatusDefs[i].doc));
  }
  return out;
}


function TKR_setUpHotlistsStore(hotlists) {
  const docdict = {};
  const ref_strs = [];

  for (let i = 0; i < hotlists.length; i++) {
    ref_strs.push(hotlists[i]['ref_str']);
    docdict[hotlists[i]['ref_str']] = hotlists[i]['summary'];
  }

  TKR_hotlistsStore = new _AC_SimpleStore(ref_strs, docdict);
  TKR_hotlistsStore.substitute = TKR_acSubstituteWithComma;
}


/**
 * An array of definitions of all well-known issue statuses.  Each
 * definition has the name of the status value, and a docstring that
 * describes its meaning.
 */
let TKR_statusWords = [];


/**
 * Constuct a new autocomplete store with all the well-known issue
 * status values.  The store has some DIT-specific methods.
 * TODO(jrobbins): would it be easier to define my own class to use
 * instead of _AC_Simple_Store?
 * @param {Array} openStatusDefs An array of definitions of the
 * well-known open status values.  Each definition has a name and
 * docstring.
 * @param {Array} closedStatusDefs An array of definitions of the
 * well-known closed status values.  Each definition has a name and
 * docstring.
 */
function TKR_setUpStatusStore(openStatusDefs, closedStatusDefs) {
  const docdict = {};
  TKR_statusWords = [];
  for (var i = 0; i < openStatusDefs.length; i++) {
    var status = openStatusDefs[i];
    TKR_statusWords.push(status.name);
    docdict[status.name] = status.doc;
  }
  for (var i = 0; i < closedStatusDefs.length; i++) {
    var status = closedStatusDefs[i];
    TKR_statusWords.push(status.name);
    docdict[status.name] = status.doc;
  }

  TKR_statusStore = new _AC_SimpleStore(TKR_statusWords, docdict);

  TKR_statusStore.commaCompletes = false;

  TKR_statusStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  TKR_statusStore.completable = function(inputValue, cursor) {
    if (!ac_everTyped) return '*status';
    return inputValue;
  };

  TKR_statusStore.completions = function(prefix, tofilter) {
    const fullList = TKR_openClosedComplete(prefix,
        openStatusDefs,
        closedStatusDefs);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };
}


/**
 * Simple function to add a given item to the list of items used to construct
 * an "autocomplete store", and also update the docstring that describes
 * that item.  They are stored separately for backward compatability with
 * autocomplete store logic that preceeded the introduction of descriptions.
 */
function TKR_addACItem(items, docDict, item, docStr) {
  items.push(item);
  docDict[item] = docStr;
}

/**
 * Adds a group of three items related to a date field.
 */
function TKR_addACDateItems(items, docDict, fieldName, humanReadable) {
  const today = new Date();
  const todayStr = (today.getFullYear() + '-' + (today.getMonth() + 1) + '-' +
    today.getDate());
  TKR_addACItem(items, docDict, fieldName + '>today-1',
      humanReadable + ' within the last N days');
  TKR_addACItem(items, docDict, fieldName + '>' + todayStr,
      humanReadable + ' after the specified date');
  TKR_addACItem(items, docDict, fieldName + '<today-1',
      humanReadable + ' more than N days ago');
}

/**
 * Add several autocomplete items to a word list that will be used to construct
 * an autocomplete store.  Also, keep track of description strings for each
 * item.  A search operator is prepended to the name of each item.  The opt_old
 * and opt_new parameters are used to transform Key-Value labels into Key=Value
 * search terms.
 */
function TKR_addACItemList(
    items, docDict, searchOp, acDefs, opt_old, opt_new) {
  let item;
  for (let i = 0; i < acDefs.length; i++) {
    const nameAndDoc = acDefs[i];
    item = searchOp + nameAndDoc.name;
    if (opt_old) {
      // Preserve any leading minus-sign.
      item = item.slice(0, 1) + item.slice(1).replace(opt_old, opt_new);
    }
    TKR_addACItem(items, docDict, item, nameAndDoc.doc);
  }
}


/**
 * Use information from an options feed to populate the artifact search
 * autocomplete menu.  The order of sections is: custom fields, labels,
 * components, people, status, special, dates.  Within each section,
 * options are ordered semantically where possible, or alphabetically
 * if there is no semantic ordering.  Negated options all come after
 * all normal options.
 */
function TKR_setUpSearchStore(
    labelDefs, memberDefs, openDefs, closedDefs, componentDefs, fieldDefs,
    indMemberDefs) {
  let searchWords = [];
  const searchWordsNeg = [];
  const docDict = {};

  // Treat Key-Value and OneWord labels separately.
  const keyValueLabelDefs = [];
  const oneWordLabelDefs = [];
  for (var i = 0; i < labelDefs.length; i++) {
    const nameAndDoc = labelDefs[i];
    if (nameAndDoc.name.indexOf('-') == -1) {
      oneWordLabelDefs.push(nameAndDoc);
    } else {
      keyValueLabelDefs.push(nameAndDoc);
    }
  }

  // Autocomplete for custom fields.
  for (i = 0; i < fieldDefs.length; i++) {
    const fieldName = fieldDefs[i]['field_name'];
    const fieldType = fieldDefs[i]['field_type'];
    if (fieldType == 'ENUM_TYPE') {
      const choices = fieldDefs[i]['choices'];
      TKR_addACItemList(searchWords, docDict, fieldName + '=', choices);
      TKR_addACItemList(searchWordsNeg, docDict, '-' + fieldName + '=', choices);
    } else if (fieldType == 'STR_TYPE') {
      TKR_addACItem(searchWords, docDict, fieldName + ':',
          fieldDefs[i]['docstring']);
    } else if (fieldType == 'DATE_TYPE') {
      TKR_addACItem(searchWords, docDict, fieldName + ':',
          fieldDefs[i]['docstring']);
      TKR_addACDateItems(searchWords, docDict, fieldName, fieldName);
    } else {
      TKR_addACItem(searchWords, docDict, fieldName + '=',
          fieldDefs[i]['docstring']);
    }
    TKR_addACItem(searchWords, docDict, 'has:' + fieldName,
        'Issues with any ' + fieldName + ' value');
    TKR_addACItem(searchWordsNeg, docDict, '-has:' + fieldName,
        'Issues with no ' + fieldName + ' value');
  }

  // Add suggestions with "me" first, because otherwise they may be impossible
  // to reach in a project that has a lot of members with emails starting with
  // "me".
  if (CS_env['loggedInUserEmail']) {
    TKR_addACItem(searchWords, docDict, 'owner:me', 'Issues owned by me');
    TKR_addACItem(searchWordsNeg, docDict, '-owner:me', 'Issues not owned by me');
    TKR_addACItem(searchWords, docDict, 'cc:me', 'Issues that CC me');
    TKR_addACItem(searchWordsNeg, docDict, '-cc:me', 'Issues that don\'t CC me');
    TKR_addACItem(searchWords, docDict, 'reporter:me', 'Issues I reported');
    TKR_addACItem(searchWordsNeg, docDict, '-reporter:me', 'Issues reported by others');
    TKR_addACItem(searchWords, docDict, 'commentby:me',
        'Issues that I commented on');
    TKR_addACItem(searchWordsNeg, docDict, '-commentby:me',
        'Issues that I didn\'t comment on');
  }

  TKR_addACItemList(searchWords, docDict, '', keyValueLabelDefs, '-', '=');
  TKR_addACItemList(searchWordsNeg, docDict, '-', keyValueLabelDefs, '-', '=');
  TKR_addACItemList(searchWords, docDict, 'label:', oneWordLabelDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-label:', oneWordLabelDefs);

  TKR_addACItemList(searchWords, docDict, 'component:', componentDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-component:', componentDefs);
  TKR_addACItem(searchWords, docDict, 'has:component',
      'Issues with any components specified');
  TKR_addACItem(searchWordsNeg, docDict, '-has:component',
      'Issues with no components specified');

  TKR_addACItemList(searchWords, docDict, 'owner:', indMemberDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-owner:', indMemberDefs);
  TKR_addACItemList(searchWords, docDict, 'cc:', memberDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-cc:', memberDefs);
  TKR_addACItem(searchWords, docDict, 'has:cc',
      'Issues with any cc\'d users');
  TKR_addACItem(searchWordsNeg, docDict, '-has:cc',
      'Issues with no cc\'d users');
  TKR_addACItemList(searchWords, docDict, 'reporter:', memberDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-reporter:', memberDefs);
  TKR_addACItemList(searchWords, docDict, 'status:', openDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-status:', openDefs);
  TKR_addACItemList(searchWords, docDict, 'status:', closedDefs);
  TKR_addACItemList(searchWordsNeg, docDict, '-status:', closedDefs);
  TKR_addACItem(searchWords, docDict, 'has:status',
      'Issues with any status');
  TKR_addACItem(searchWordsNeg, docDict, '-has:status',
      'Issues with no status');

  TKR_addACItem(searchWords, docDict, 'is:blocked',
      'Issues that are blocked');
  TKR_addACItem(searchWordsNeg, docDict, '-is:blocked',
      'Issues that are not blocked');
  TKR_addACItem(searchWords, docDict, 'has:blockedon',
      'Issues that are blocked');
  TKR_addACItem(searchWordsNeg, docDict, '-has:blockedon',
      'Issues that are not blocked');
  TKR_addACItem(searchWords, docDict, 'has:blocking',
      'Issues that are blocking other issues');
  TKR_addACItem(searchWordsNeg, docDict, '-has:blocking',
      'Issues that are not blocking other issues');
  TKR_addACItem(searchWords, docDict, 'has:mergedinto',
      'Issues that were merged into other issues');
  TKR_addACItem(searchWordsNeg, docDict, '-has:mergedinto',
      'Issues that were not merged into other issues');

  TKR_addACItem(searchWords, docDict, 'is:starred',
      'Starred by me');
  TKR_addACItem(searchWordsNeg, docDict, '-is:starred',
      'Not starred by me');
  TKR_addACItem(searchWords, docDict, 'stars>10',
      'More than 10 stars');
  TKR_addACItem(searchWords, docDict, 'stars>100',
      'More than 100 stars');
  TKR_addACItem(searchWords, docDict, 'summary:',
      'Search within the summary field');

  TKR_addACItemList(searchWords, docDict, 'commentby:', memberDefs);
  TKR_addACItem(searchWords, docDict, 'attachment:',
      'Search within attachment names');
  TKR_addACItem(searchWords, docDict, 'attachments>5',
      'Has more than 5 attachments');
  TKR_addACItem(searchWords, docDict, 'is:open', 'Issues that are open');
  TKR_addACItem(searchWordsNeg, docDict, '-is:open', 'Issues that are closed');
  TKR_addACItem(searchWords, docDict, 'has:owner',
      'Issues with some owner');
  TKR_addACItem(searchWordsNeg, docDict, '-has:owner',
      'Issues with no owner');
  TKR_addACItem(searchWords, docDict, 'has:attachments',
      'Issues with some attachments');
  TKR_addACItem(searchWords, docDict, 'id:1,2,3',
      'Match only the specified issues');
  TKR_addACItem(searchWords, docDict, 'id<100000',
      'Issues with IDs under 100,000');
  TKR_addACItem(searchWords, docDict, 'blockedon:1',
      'Blocked on the specified issues');
  TKR_addACItem(searchWords, docDict, 'blocking:1',
      'Blocking the specified issues');
  TKR_addACItem(searchWords, docDict, 'mergedinto:1',
      'Merged into the specified issues');
  TKR_addACItem(searchWords, docDict, 'is:ownerbouncing',
      'Issues with owners we cannot contact');
  TKR_addACItem(searchWords, docDict, 'is:spam', 'Issues classified as spam');
  // We do not suggest -is:spam because it is implicit.

  TKR_addACDateItems(searchWords, docDict, 'opened', 'Opened');
  TKR_addACDateItems(searchWords, docDict, 'modified', 'Modified');
  TKR_addACDateItems(searchWords, docDict, 'closed', 'Closed');
  TKR_addACDateItems(searchWords, docDict, 'ownermodified', 'Owner field modified');
  TKR_addACDateItems(searchWords, docDict, 'ownerlastvisit', 'Owner last visit');
  TKR_addACDateItems(searchWords, docDict, 'statusmodified', 'Status field modified');
  TKR_addACDateItems(
      searchWords, docDict, 'componentmodified', 'Component field modified');

  TKR_projectQueryStore = new _AC_SimpleStore(searchWords, docDict);

  searchWords = searchWords.concat(searchWordsNeg);

  TKR_searchStore = new _AC_SimpleStore(searchWords, docDict);

  // When we insert an autocomplete value, replace an entire search term.
  // Add just a space after it (not a comma) if it is a complete search term,
  // or leave the caret immediately after the completion if we are just helping
  // the user with the search operator.
  TKR_searchStore.substitute =
      function(inputValue, caret, completable, completion) {
        let nextTerm = caret;
        while (inputValue.charAt(nextTerm) != ' ' &&
               nextTerm < inputValue.length) {
          nextTerm++;
        }
        while (inputValue.charAt(nextTerm) == ' ' &&
               nextTerm < inputValue.length) {
          nextTerm++;
        }
        return inputValue.substring(0, caret - completable.length) +
               completion.value + ' ' + inputValue.substring(nextTerm);
      };
  TKR_searchStore.autoselectFirstRow =
      function() {
        return false;
      };

  TKR_projectQueryStore.substitute = TKR_searchStore.substitute;
  TKR_projectQueryStore.autoselectFirstRow = TKR_searchStore.autoselectFirstRow;
}


/**
 * Use information from an options feed to populate the issue quick edit
 * autocomplete menu.
 */
function TKR_setUpQuickEditStore(
    labelDefs, memberDefs, openDefs, closedDefs, indMemberDefs) {
  const qeWords = [];
  const docDict = {};

  // Treat Key-Value and OneWord labels separately.
  const keyValueLabelDefs = [];
  const oneWordLabelDefs = [];
  for (let i = 0; i < labelDefs.length; i++) {
    const nameAndDoc = labelDefs[i];
    if (nameAndDoc.name.indexOf('-') == -1) {
      oneWordLabelDefs.push(nameAndDoc);
    } else {
      keyValueLabelDefs.push(nameAndDoc);
    }
  }
  TKR_addACItemList(qeWords, docDict, '', keyValueLabelDefs, '-', '=');
  TKR_addACItemList(qeWords, docDict, '-', keyValueLabelDefs, '-', '=');
  TKR_addACItemList(qeWords, docDict, '', oneWordLabelDefs);
  TKR_addACItemList(qeWords, docDict, '-', oneWordLabelDefs);

  TKR_addACItem(qeWords, docDict, 'owner=me', 'Make me the owner');
  TKR_addACItem(qeWords, docDict, 'owner=----', 'Clear the owner field');
  TKR_addACItem(qeWords, docDict, 'cc=me', 'CC me on this issue');
  TKR_addACItem(qeWords, docDict, 'cc=-me', 'Remove me from CC list');
  TKR_addACItemList(qeWords, docDict, 'owner=', indMemberDefs);
  TKR_addACItemList(qeWords, docDict, 'cc=', memberDefs);
  TKR_addACItemList(qeWords, docDict, 'cc=-', memberDefs);
  TKR_addACItemList(qeWords, docDict, 'status=', openDefs);
  TKR_addACItemList(qeWords, docDict, 'status=', closedDefs);
  TKR_addACItem(qeWords, docDict, 'summary=""', 'Set the summary field');

  TKR_quickEditStore = new _AC_SimpleStore(qeWords, docDict);

  // When we insert an autocomplete value, replace an entire command part.
  // Add just a space after it (not a comma) if it is a complete part,
  // or leave the caret immediately after the completion if we are just helping
  // the user with the command operator.
  TKR_quickEditStore.substitute =
      function(inputValue, caret, completable, completion) {
        let nextTerm = caret;
        while (inputValue.charAt(nextTerm) != ' ' &&
               nextTerm < inputValue.length) {
          nextTerm++;
        }
        while (inputValue.charAt(nextTerm) == ' ' &&
               nextTerm < inputValue.length) {
          nextTerm++;
        }
        return inputValue.substring(0, caret - completable.length) +
               completion.value + ' ' + inputValue.substring(nextTerm);
      };
}


/**
 * Constuct a new autocomplete store with all the project
 * custom permissions.
 * @param {Array} customPermissions An array of custom permission names.
 */
function TKR_setUpCustomPermissionsStore(customPermissions) {
  customPermissions = customPermissions || [];
  const permWords = ['View', 'EditIssue', 'AddIssueComment', 'DeleteIssue'];
  const docdict = {
    'View': '', 'EditIssue': '', 'AddIssueComment': '', 'DeleteIssue': ''};
  for (let i = 0; i < customPermissions.length; i++) {
    permWords.push(customPermissions[i]);
    docdict[customPermissions[i]] = '';
  }

  TKR_customPermissionsStore = new _AC_SimpleStore(permWords, docdict);

  TKR_customPermissionsStore.commaCompletes = false;

  TKR_customPermissionsStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };
}


/**
 * Constuct a new autocomplete store with all the well-known project
 * member user names and real names.  The store has some
 * monorail-specific methods.
 * TODO(jrobbins): would it be easier to define my own class to use
 * instead of _AC_Simple_Store?
 * @param {Array} memberDefs an array of member objects.
 * @param {Array} nonGroupMemberDefs an array of member objects who are not groups.
 */
function TKR_setUpMemberStore(memberDefs, nonGroupMemberDefs) {
  const memberWords = [];
  const indMemberWords = [];
  const docdict = {};

  memberDefs.forEach((memberDef) => {
    memberWords.push(memberDef.name);
    docdict[memberDef.name] = null;
  });
  nonGroupMemberDefs.forEach((memberDef) => {
    indMemberWords.push(memberDef.name);
  });

  TKR_memberListStore = new _AC_SimpleStore(memberWords, docdict);

  TKR_memberListStore.completions = function(prefix, tofilter) {
    const fullList = TKR_fullComplete(prefix, memberDefs);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };

  TKR_memberListStore.completable = function(inputValue, cursor) {
    if (inputValue == '') return '*member';
    return _AC_SimpleStore.prototype.completable.call(this, inputValue, cursor);
  };

  TKR_memberListStore.substitute = TKR_acSubstituteWithComma;

  TKR_ownerStore = new _AC_SimpleStore(indMemberWords, docdict);

  TKR_ownerStore.commaCompletes = false;

  TKR_ownerStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  TKR_ownerStore.completions = function(prefix, tofilter) {
    const fullList = TKR_fullComplete(prefix, nonGroupMemberDefs);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };

  TKR_ownerStore.completable = function(inputValue, cursor) {
    if (!ac_everTyped) return '*owner';
    return inputValue;
  };
}


/**
 * Constuct one new autocomplete store for each user-valued custom
 * field that has a needs_perm validation requirement, and thus a
 * list of allowed user indexes.
 * TODO(jrobbins): would it be easier to define my own class to use
 * instead of _AC_Simple_Store?
 * @param {Array} fieldDefs An array of field definitions, only some
 * of which have a 'user_indexes' entry.
 */
function TKR_setUpUserAutocompleteStores(fieldDefs) {
  fieldDefs.forEach((fieldDef) => {
    if (fieldDef.qualifiedMembers) {
      const us = makeOneUserAutocompleteStore(fieldDef);
      TKR_userAutocompleteStores['custom_' + fieldDef['field_id']] = us;
    }
  });
}

function makeOneUserAutocompleteStore(fieldDef) {
  const memberWords = [];
  const docdict = {};
  for (const member of fieldDef.qualifiedMembers) {
    memberWords.push(member.name);
    docdict[member.name] = member.doc;
  }

  const userStore = new _AC_SimpleStore(memberWords, docdict);
  userStore.commaCompletes = false;

  userStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  userStore.completions = function(prefix, tofilter) {
    const fullList = TKR_fullComplete(prefix, fieldDef.qualifiedMembers);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };

  userStore.completable = function(inputValue, cursor) {
    if (!ac_everTyped) return '*custom';
    return inputValue;
  };

  return userStore;
}


/**
 * Constuct a new autocomplete store with all the components.
 * The store has some monorail-specific methods.
 * @param {Array} componentDefs An array of definitions of components.
 */
function TKR_setUpComponentStore(componentDefs) {
  const componentWords = [];
  const docdict = {};
  for (let i = 0; i < componentDefs.length; i++) {
    const component = componentDefs[i];
    componentWords.push(component.name);
    docdict[component.name] = component.doc;
  }

  const completions = function(prefix, tofilter) {
    const fullList = TKR_fullComplete(prefix, componentDefs);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };
  const completable = function(inputValue, cursor) {
    if (inputValue == '') return '*component';
    return _AC_SimpleStore.prototype.completable.call(this, inputValue, cursor);
  };

  TKR_componentStore = new _AC_SimpleStore(componentWords, docdict);
  TKR_componentStore.commaCompletes = false;
  TKR_componentStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };
  TKR_componentStore.completions = completions;
  TKR_componentStore.completable = completable;

  TKR_componentListStore = new _AC_SimpleStore(componentWords, docdict);
  TKR_componentListStore.commaCompletes = false;
  TKR_componentListStore.substitute = TKR_acSubstituteWithComma;
  TKR_componentListStore.completions = completions;
  TKR_componentListStore.completable = completable;
}


/**
 * An array of definitions of all well-known issue labels.  Each
 * definition has the name of the label, and a docstring that
 * describes its meaning.
 */
let TKR_labelWords = [];


/**
 * Constuct a new autocomplete store with all the well-known issue
 * labels for the current project.  The store has some DIT-specific methods.
 * TODO(jrobbins): would it be easier to define my own class to use
 * instead of _AC_Simple_Store?
 * @param {Array} labelDefs An array of definitions of the project
 * members.  Each definition has a name and docstring.
 */
function TKR_setUpLabelStore(labelDefs) {
  TKR_labelWords = [];
  const TKR_labelPrefixes = [];
  const labelPrefs = new Set();
  const docdict = {};
  for (let i = 0; i < labelDefs.length; i++) {
    const label = labelDefs[i];
    TKR_labelWords.push(label.name);
    TKR_labelPrefixes.push(label.name.split('-')[0]);
    docdict[label.name] = label.doc;
    labelPrefs.add(label.name.split('-')[0]);
  }
  const labelPrefArray = Array.from(labelPrefs);
  const labelPrefDefs = labelPrefArray.map((s) => ({name: s, doc: ''}));

  TKR_labelStore = new _AC_SimpleStore(TKR_labelWords, docdict);

  TKR_labelStore.commaCompletes = false;
  TKR_labelStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  TKR_labelPrefixStore = new _AC_SimpleStore(TKR_labelPrefixes);

  TKR_labelPrefixStore.commaCompletes = false;
  TKR_labelPrefixStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  TKR_labelMultiStore = new _AC_SimpleStore(TKR_labelWords, docdict);

  TKR_labelMultiStore.substitute = TKR_acSubstituteWithComma;

  const completable = function(inputValue, cursor) {
    if (cursor === 0) {
      return '*label'; // Show every well-known label that is not redundant.
    }
    let start = 0;
    for (let i = cursor; --i >= 0;) {
      const c = inputValue.charAt(i);
      if (c === ' ' || c === ',') {
        start = i + 1;
        break;
      }
    }
    const questionPos = inputValue.indexOf('?');
    if (questionPos >= 0) {
      // Ignore any "?" character and anything after it.
      inputValue = inputValue.substring(start, questionPos);
    }
    let result = inputValue.substring(start, cursor);
    if (inputValue.lastIndexOf('-') > 0 && !ac_everTyped) {
      // Act like a menu: offer all alternative values for the same prefix.
      result = inputValue.substring(
          start, Math.min(cursor, inputValue.lastIndexOf('-')));
    }
    if (inputValue.startsWith('Restrict-') && !ac_everTyped) {
      // If user is in the middle of 2nd part, use that to narrow the choices.
      result = inputValue;
      // If they completed 2nd part, give all choices matching 2-part prefix.
      if (inputValue.lastIndexOf('-') > 8) {
        result = inputValue.substring(
            start, Math.min(cursor, inputValue.lastIndexOf('-') + 1));
      }
    }

    return result;
  };

  const computeAvoid = function() {
    const labelTextFields = Array.from(
        document.querySelectorAll('.labelinput'));
    const otherTextFields = labelTextFields.filter(
        (tf) => (tf !== ac_focusedInput && tf.value));
    return otherTextFields.map((tf) => tf.value);
  };


  const completions = function(labeldic) {
    return function(prefix, tofilter) {
      let comps = TKR_fullComplete(prefix, labeldic);
      if (comps === null) {
        comps = _AC_SimpleStore.prototype.completions.call(
            this, prefix, tofilter);
      }

      const filteredComps = [];
      for (const completion of comps) {
        const completionLower = completion.value.toLowerCase();
        const labelPrefix = completionLower.split('-')[0];
        let alreadyUsed = false;
        const isExclusive = FindInArray(TKR_exclPrefixes, labelPrefix) !== -1;
        if (isExclusive) {
          for (const usedLabel of ac_avoidValues) {
            if (usedLabel.startsWith(labelPrefix + '-')) {
              alreadyUsed = true;
              break;
            }
          }
        }
        if (!alreadyUsed) {
          filteredComps.push(completion);
        }
      }

      return filteredComps;
    };
  };

  TKR_labelStore.computeAvoid = computeAvoid;
  TKR_labelStore.completable = completable;
  TKR_labelStore.completions = completions(labelDefs);

  TKR_labelPrefixStore.completable = completable;
  TKR_labelPrefixStore.completions = completions(labelPrefDefs);

  TKR_labelMultiStore.completable = completable;
  TKR_labelMultiStore.completions = completions(labelDefs);
}


/**
 * Constuct a new autocomplete store with the given strings as choices.
 * @param {Array} choices An array of autocomplete choices.
 */
function TKR_setUpAutoCompleteStore(choices) {
  TKR_autoCompleteStore = new _AC_SimpleStore(choices);
  const choicesDefs = [];
  for (let i = 0; i < choices.length; ++i) {
    choicesDefs.push({'name': choices[i], 'doc': ''});
  }

  /**
   * Override the default completions() function to return a list of
   * available choices.  It proactively shows all choices when the user has
   * not yet typed anything.  It stops offering choices if the text field
   * has a pretty long string in it already.  It does not offer choices that
   * have already been chosen.
   */
  TKR_autoCompleteStore.completions = function(prefix, tofilter) {
    if (prefix.length > 18) {
      return [];
    }
    let comps = TKR_fullComplete(prefix, choicesDefs);
    if (comps == null) {
      comps = _AC_SimpleStore.prototype.completions.call(
          this, prefix, tofilter);
    }

    const usedComps = {};
    const textFields = document.getElementsByTagName('input');
    for (var i = 0; i < textFields.length; ++i) {
      if (textFields[i].classList.contains('autocomplete')) {
        usedComps[textFields[i].value] = true;
      }
    }
    const unusedComps = [];
    for (i = 0; i < comps.length; ++i) {
      if (!usedComps[comps[i].value]) {
        unusedComps.push(comps[i]);
      }
    }

    return unusedComps;
  };

  /**
   * Override the default completable() function with one that gives a
   * special value when the user has not yet typed anything.  This
   * causes TKR_fullComplete() to show all choices.  Also, always consider
   * the whole textfield value as an input to completion matching.  Otherwise,
   * it would only consider the part after the last comma (which makes sense
   * for gmail To: and Cc: address fields).
   */
  TKR_autoCompleteStore.completable = function(inputValue, cursor) {
    if (inputValue == '') {
      return '*ac';
    }
    return inputValue;
  };

  /**
   * Override the default substitute() function to completely replace the
   * contents of the text field when the user selects a completion. Otherwise,
   * it would append, much like the Gmail To: and Cc: fields append autocomplete
   * selections.
   */
  TKR_autoCompleteStore.substitute =
  function(inputValue, cursor, completable, completion) {
    return completion.value;
  };

  /**
   * We consider the whole textfield to be one value, not a comma separated
   * list.  So, typing a ',' should not trigger an autocomplete selection.
   */
  TKR_autoCompleteStore.commaCompletes = false;
}


/**
 * XMLHTTP object used to fetch autocomplete options from the server.
 */
const TKR_optionsXmlHttp = undefined;

/**
 * Contact the server to fetch the set of autocomplete options for the
 * projects the user is contributor/member/owner of.
 * @param {multiValue} boolean If set to true, the projectStore is configured to
 * have support for multi-values (useful for example for saved queries where
 * a query can apply to multiple projects).
 */
function TKR_fetchUserProjects(multiValue) {
  // Set a request token to prevent XSRF leaking of user project lists.
  const userRefs = [{displayName: window.CS_env.loggedInUserEmail}];
  const userProjectsPromise = window.prpcClient.call(
      'monorail.Users', 'GetUsersProjects', {userRefs});
  userProjectsPromise.then((response) => {
    const userProjects = response.usersProjects[0];
    const projects = (userProjects.ownerOf || [])
        .concat(userProjects.memberOf || [])
        .concat(userProjects.contributorTo || []);
    projects.sort();
    if (projects) {
      TKR_setUpProjectStore(projects, multiValue);
    }
  });
}


/**
 * Constuct a new autocomplete store with all the projects that the
 * current user has visibility into. The store has some monorail-specific
 * methods.
 * @param {Array} projects An array of project names.
 * @param {boolean} multiValue Determines whether the store should support
 *                  multiple values.
 */
function TKR_setUpProjectStore(projects, multiValue) {
  const projectsDefs = [];
  const docdict = {};
  for (let i = 0; i < projects.length; ++i) {
    projectsDefs.push({'name': projects[i], 'doc': ''});
    docdict[projects[i]] = '';
  }

  TKR_projectStore = new _AC_SimpleStore(projects, docdict);
  TKR_projectStore.commaCompletes = !multiValue;

  if (multiValue) {
    TKR_projectStore.substitute = TKR_acSubstituteWithComma;
  } else {
    TKR_projectStore.substitute =
      function(inputValue, cursor, completable, completion) {
        return completion.value;
      };
  }

  TKR_projectStore.completions = function(prefix, tofilter) {
    const fullList = TKR_fullComplete(prefix, projectsDefs);
    if (fullList) return fullList;
    return _AC_SimpleStore.prototype.completions.call(this, prefix, tofilter);
  };

  TKR_projectStore.completable = function(inputValue, cursor) {
    if (inputValue == '') return '*project';
    if (multiValue) {
      return _AC_SimpleStore.prototype.completable.call(
          this, inputValue, cursor);
    } else {
      return inputValue;
    }
  };
}


/**
 * Convert the object resulting of a monorail.Projects ListStatuses to
 * the format expected by TKR_populateAutocomplete.
 * @param {object} statusesResponse A pRPC ListStatusesResponse object.
 */
function TKR_convertStatuses(statusesResponse) {
  const statusDefs = statusesResponse.statusDefs || [];
  const jsonData = {};

  // Split statusDefs into open and closed name-doc objects.
  jsonData.open = [];
  jsonData.closed = [];
  for (const s of statusDefs) {
    if (!s.deprecated) {
      const item = {
        name: s.status,
        doc: s.docstring,
      };
      if (s.meansOpen) {
        jsonData.open.push(item);
      } else {
        jsonData.closed.push(item);
      }
    }
  }

  jsonData.strict = statusesResponse.restrictToKnown;

  return jsonData;
}


/**
 * Convert the object resulting of a monorail.Projects ListComponents to
 * the format expected by TKR_populateAutocomplete.
 * @param {object} componentsResponse A pRPC ListComponentsResponse object.
 */
function TKR_convertComponents(componentsResponse) {
  const componentDefs = (componentsResponse.componentDefs || []);
  const jsonData = {};

  // Filter out deprecated components and normalize to name-doc object.
  jsonData.components = [];
  for (const c of componentDefs) {
    if (!c.deprecated) {
      jsonData.components.push({
        name: c.path,
        doc: c.docstring,
      });
    }
  }

  return jsonData;
}


/**
 * Convert the object resulting of a monorail.Projects GetLabelOptions
 * call to the format expected by TKR_populateAutocomplete.
 * @param {object} labelsResponse A pRPC GetLabelOptionsResponse.
 * @param {Array<FieldDef>=} fieldDefs FieldDefs from a project config, used to
 *   mask labels that are used to implement custom enum fields.
 */
function TKR_convertLabels(labelsResponse, fieldDefs = []) {
  const labelDefs = (labelsResponse.labelDefs || []);
  const exclusiveLabelPrefixes = (labelsResponse.exclusiveLabelPrefixes || []);
  const jsonData = {};

  const maskedLabels = new Set();
  fieldDefs.forEach((fd) => {
    if (fd.enumChoices) {
      fd.enumChoices.forEach(({label}) => {
        maskedLabels.add(`${fd.fieldRef.fieldName}-${label}`);
      });
    }
  });

  jsonData.labels = labelDefs.filter(({label}) => !maskedLabels.has(label)).map(
      (label) => ({name: label.label, doc: label.docstring}));

  jsonData.excl_prefixes = exclusiveLabelPrefixes.map(
      (prefix) => prefix.toLowerCase());

  return jsonData;
}


/**
 * Convert the object resulting of a monorail.Projects GetVisibleMembers
 * call to the format expected by TKR_populateAutocomplete.
 * @param {object?} visibleMembersResponse A pRPC GetVisibleMembersResponse.
 * @return {{memberEmails: {name: string}, nonGroupEmails: {name: string}}}
 */
function TKR_convertVisibleMembers(visibleMembersResponse) {
  if (!visibleMembersResponse) {
    visibleMembersResponse = {};
  }
  const groupRefs = (visibleMembersResponse.groupRefs || []);
  const userRefs = (visibleMembersResponse.userRefs || []);
  const jsonData = {};

  const groupEmails = new Set(groupRefs.map(
      (groupRef) => groupRef.displayName));

  jsonData.memberEmails = userRefs.map(
      (userRef) => ({name: userRef.displayName}));
  jsonData.nonGroupEmails = jsonData.memberEmails.filter(
      (memberEmail) => !groupEmails.has(memberEmail));

  return jsonData;
}


/**
 * Convert the object resulting of a monorail.Projects ListFields to
 * the format expected by TKR_populateAutocomplete.
 * @param {object} fieldsResponse A pRPC ListFieldsResponse object.
 */
function TKR_convertFields(fieldsResponse) {
  const fieldDefs = (fieldsResponse.fieldDefs || []);
  const jsonData = {};

  jsonData.fields = fieldDefs.map((field) =>
    ({
      field_id: field.fieldRef.fieldId,
      field_name: field.fieldRef.fieldName,
      field_type: field.fieldRef.type,
      docstring: field.docstring,
      choices: (field.enumChoices || []).map(
          (choice) => ({name: choice.label, doc: choice.docstring})),
      qualifiedMembers: (field.userChoices || []).map(
          (userRef) => ({name: userRef.displayName})),
    }),
  );

  return jsonData;
}


/**
 * Convert the object resulting of a monorail.Features ListHotlistsByUser
 * call to the format expected by TKR_populateAutocomplete.
 * @param {Array<HotlistV0>} hotlists A lists of hotlists
 * @return {Array<{ref_str: string, summary: string}>}
 */
function TKR_convertHotlists(hotlists) {
  if (hotlists === undefined) {
    return [];
  }

  const seen = new Set();
  const ambiguousNames = new Set();

  hotlists.forEach((hotlist) => {
    if (seen.has(hotlist.name)) {
      ambiguousNames.add(hotlist.name);
    }
    seen.add(hotlist.name);
  });

  return hotlists.map((hotlist) => {
    let ref_str = hotlist.name;
    if (ambiguousNames.has(hotlist.name)) {
      ref_str = hotlist.owner_ref.display_name + ':' + ref_str;
    }
    return {ref_str: ref_str, summary: hotlist.summary};
  });
}


/**
 * Initializes hotlists in autocomplete store.
 * @param {Array<HotlistV0>} hotlists
 */
function TKR_populateHotlistAutocomplete(hotlists) {
  TKR_setUpHotlistsStore(TKR_convertHotlists(hotlists));
}


/**
 * Add project config data that's already been fetched to the legacy
 * autocomplete.
 * @param {Config} projectConfig Returned projectConfig data.
 * @param {GetVisibleMembersResponse} visibleMembers
 * @param {Array<string>} customPermissions
 */
function TKR_populateAutocomplete(projectConfig, visibleMembers,
    customPermissions = []) {
  const {statusDefs, componentDefs, labelDefs, fieldDefs,
    exclusiveLabelPrefixes, projectName} = projectConfig;

  const {memberEmails, nonGroupEmails} =
    TKR_convertVisibleMembers(visibleMembers);
  TKR_setUpMemberStore(memberEmails, nonGroupEmails);
  TKR_prepOwnerField(memberEmails);

  const {open, closed, strict} = TKR_convertStatuses({statusDefs});
  TKR_setUpStatusStore(open, closed);
  TKR_restrict_to_known = strict;

  const {components} = TKR_convertComponents({componentDefs});
  TKR_setUpComponentStore(components);

  const {excl_prefixes, labels} = TKR_convertLabels(
      {labelDefs, exclusiveLabelPrefixes}, fieldDefs);
  TKR_exclPrefixes = excl_prefixes;
  TKR_setUpLabelStore(labels);

  const {fields} = TKR_convertFields({fieldDefs});
  TKR_setUpUserAutocompleteStores(fields);

  /* QuickEdit is not yet in Monorail. crbug.com/monorail/1926
  TKR_setUpQuickEditStore(
      jsonData.labels, jsonData.memberEmails, jsonData.open, jsonData.closed,
      jsonData.nonGroupEmails);
  */

  // We need to wait until both exclusive prefixes (in configPromise) and
  // labels (in labelsPromise) have been read.
  TKR_prepLabelAC(TKR_labelFieldIDPrefix);

  TKR_setUpSearchStore(
      labels, memberEmails, open, closed,
      components, fields, nonGroupEmails);

  TKR_setUpCustomPermissionsStore(customPermissions);
}