import { createTerm } from '@gitlab/ui/src/components/base/filtered_search/filtered_search_utils';
import { isPositiveInteger } from '~/lib/utils/number_utils';
import { getParameterByName } from '~/lib/utils/url_utility';
import { __ } from '~/locale';
import {
  FILTERED_SEARCH_TERM,
  OPERATOR_NOT,
  OPERATOR_OR,
  TOKEN_TYPE_ASSIGNEE,
  TOKEN_TYPE_AUTHOR,
  TOKEN_TYPE_CONFIDENTIAL,
  TOKEN_TYPE_ITERATION,
  TOKEN_TYPE_MILESTONE,
  TOKEN_TYPE_RELEASE,
  TOKEN_TYPE_TYPE,
} from '~/vue_shared/components/filtered_search_bar/constants';
import {
  ALTERNATIVE_FILTER,
  API_PARAM,
  BLOCKING_ISSUES_ASC,
  BLOCKING_ISSUES_DESC,
  CLOSED_AT_ASC,
  CLOSED_AT_DESC,
  CREATED_ASC,
  CREATED_DESC,
  DUE_DATE_ASC,
  DUE_DATE_DESC,
  filters,
  HEALTH_STATUS_ASC,
  HEALTH_STATUS_DESC,
  LABEL_PRIORITY_ASC,
  LABEL_PRIORITY_DESC,
  MILESTONE_DUE_ASC,
  MILESTONE_DUE_DESC,
  NORMAL_FILTER,
  PAGE_SIZE,
  PARAM_ASSIGNEE_ID,
  POPULARITY_ASC,
  POPULARITY_DESC,
  PRIORITY_ASC,
  PRIORITY_DESC,
  RELATIVE_POSITION_ASC,
  SPECIAL_FILTER,
  specialFilterValues,
  TITLE_ASC,
  TITLE_DESC,
  UPDATED_ASC,
  UPDATED_DESC,
  URL_PARAM,
  urlSortParams,
  WEIGHT_ASC,
  WEIGHT_DESC,
} from './constants';

export const getInitialPageParams = (
  pageSize,
  firstPageSize = pageSize ?? PAGE_SIZE,
  lastPageSize,
  afterCursor,
  beforeCursor,
) => ({
  firstPageSize: lastPageSize ? undefined : firstPageSize,
  lastPageSize,
  afterCursor,
  beforeCursor,
});

export const getSortKey = (sort) =>
  Object.keys(urlSortParams).find((key) => urlSortParams[key] === sort);

export const isSortKey = (sort) => Object.keys(urlSortParams).includes(sort);

export const getSortOptions = ({
  hasBlockedIssuesFeature,
  hasIssuableHealthStatusFeature,
  hasIssueWeightsFeature,
}) => {
  const sortOptions = [
    {
      id: 1,
      title: __('Priority'),
      sortDirection: {
        ascending: PRIORITY_ASC,
        descending: PRIORITY_DESC,
      },
    },
    {
      id: 2,
      title: __('Created date'),
      sortDirection: {
        ascending: CREATED_ASC,
        descending: CREATED_DESC,
      },
    },
    {
      id: 3,
      title: __('Updated date'),
      sortDirection: {
        ascending: UPDATED_ASC,
        descending: UPDATED_DESC,
      },
    },
    {
      id: 4,
      title: __('Closed date'),
      sortDirection: {
        ascending: CLOSED_AT_ASC,
        descending: CLOSED_AT_DESC,
      },
    },
    {
      id: 5,
      title: __('Milestone due date'),
      sortDirection: {
        ascending: MILESTONE_DUE_ASC,
        descending: MILESTONE_DUE_DESC,
      },
    },
    {
      id: 6,
      title: __('Due date'),
      sortDirection: {
        ascending: DUE_DATE_ASC,
        descending: DUE_DATE_DESC,
      },
    },
    {
      id: 7,
      title: __('Popularity'),
      sortDirection: {
        ascending: POPULARITY_ASC,
        descending: POPULARITY_DESC,
      },
    },
    {
      id: 8,
      title: __('Label priority'),
      sortDirection: {
        ascending: LABEL_PRIORITY_ASC,
        descending: LABEL_PRIORITY_DESC,
      },
    },
    {
      id: 9,
      title: __('Manual'),
      sortDirection: {
        ascending: RELATIVE_POSITION_ASC,
        descending: RELATIVE_POSITION_ASC,
      },
    },
    {
      id: 10,
      title: __('Title'),
      sortDirection: {
        ascending: TITLE_ASC,
        descending: TITLE_DESC,
      },
    },
  ];

  if (hasIssuableHealthStatusFeature) {
    sortOptions.push({
      id: sortOptions.length + 1,
      title: __('Health'),
      sortDirection: {
        ascending: HEALTH_STATUS_ASC,
        descending: HEALTH_STATUS_DESC,
      },
    });
  }

  if (hasIssueWeightsFeature) {
    sortOptions.push({
      id: sortOptions.length + 1,
      title: __('Weight'),
      sortDirection: {
        ascending: WEIGHT_ASC,
        descending: WEIGHT_DESC,
      },
    });
  }

  if (hasBlockedIssuesFeature) {
    sortOptions.push({
      id: sortOptions.length + 1,
      title: __('Blocking'),
      sortDirection: {
        ascending: BLOCKING_ISSUES_ASC,
        descending: BLOCKING_ISSUES_DESC,
      },
    });
  }

  return sortOptions;
};

const tokenTypes = Object.keys(filters);

const getUrlParams = (tokenType) =>
  Object.values(filters[tokenType][URL_PARAM]).flatMap((filterObj) => Object.values(filterObj));

const urlParamKeys = tokenTypes.flatMap(getUrlParams);

const getTokenTypeFromUrlParamKey = (urlParamKey) =>
  tokenTypes.find((tokenType) => getUrlParams(tokenType).includes(urlParamKey));

const getOperatorFromUrlParamKey = (tokenType, urlParamKey) =>
  Object.entries(filters[tokenType][URL_PARAM]).find(([, filterObj]) =>
    Object.values(filterObj).includes(urlParamKey),
  )[0];

const convertToFilteredTokens = (locationSearch) =>
  Array.from(new URLSearchParams(locationSearch).entries())
    .filter(([key]) => urlParamKeys.includes(key))
    .map(([key, data]) => {
      const type = getTokenTypeFromUrlParamKey(key);
      const operator = getOperatorFromUrlParamKey(type, key);
      return {
        type,
        value: { data, operator },
      };
    });

const convertToFilteredSearchTerms = (locationSearch) =>
  new URLSearchParams(locationSearch)
    .get('search')
    ?.split(' ')
    .map((word) => ({
      type: FILTERED_SEARCH_TERM,
      value: {
        data: word,
      },
    })) || [];

export const getFilterTokens = (locationSearch) => {
  if (!locationSearch) {
    return [createTerm()];
  }
  const filterTokens = convertToFilteredTokens(locationSearch);
  const searchTokens = convertToFilteredSearchTerms(locationSearch);
  const tokens = filterTokens.concat(searchTokens);
  return tokens.length ? tokens : [createTerm()];
};

const isSpecialFilter = (type, data) => {
  const isAssigneeIdParam =
    type === TOKEN_TYPE_ASSIGNEE &&
    isPositiveInteger(data) &&
    getParameterByName(PARAM_ASSIGNEE_ID) === data;
  return specialFilterValues.includes(data) || isAssigneeIdParam;
};

const getFilterType = ({ type, value: { data, operator } }) => {
  const isUnionedAuthor = type === TOKEN_TYPE_AUTHOR && operator === OPERATOR_OR;

  if (isUnionedAuthor) {
    return ALTERNATIVE_FILTER;
  }
  if (isSpecialFilter(type, data)) {
    return SPECIAL_FILTER;
  }
  return NORMAL_FILTER;
};

const wildcardTokens = [TOKEN_TYPE_ITERATION, TOKEN_TYPE_MILESTONE, TOKEN_TYPE_RELEASE];

const isWildcardValue = (tokenType, value) =>
  wildcardTokens.includes(tokenType) && specialFilterValues.includes(value);

const requiresUpperCaseValue = (tokenType, value) =>
  tokenType === TOKEN_TYPE_TYPE || isWildcardValue(tokenType, value);

const formatData = (token) => {
  if (requiresUpperCaseValue(token.type, token.value.data)) {
    return token.value.data.toUpperCase();
  }
  if (token.type === TOKEN_TYPE_CONFIDENTIAL) {
    return token.value.data === 'yes';
  }
  return token.value.data;
};

export const convertToApiParams = (filterTokens) => {
  const params = {};
  const not = {};
  const or = {};

  filterTokens
    .filter((token) => token.type !== FILTERED_SEARCH_TERM)
    .forEach((token) => {
      const filterType = getFilterType(token);
      const apiField = filters[token.type][API_PARAM][filterType];
      let obj;
      if (token.value.operator === OPERATOR_NOT) {
        obj = not;
      } else if (token.value.operator === OPERATOR_OR) {
        obj = or;
      } else {
        obj = params;
      }
      const data = formatData(token);
      Object.assign(obj, {
        [apiField]: obj[apiField] ? [obj[apiField], data].flat() : data,
      });
    });

  if (Object.keys(not).length) {
    Object.assign(params, { not });
  }

  if (Object.keys(or).length) {
    Object.assign(params, { or });
  }

  return params;
};

export const convertToUrlParams = (filterTokens) =>
  filterTokens
    .filter((token) => token.type !== FILTERED_SEARCH_TERM)
    .reduce((acc, token) => {
      const filterType = getFilterType(token);
      const urlParam = filters[token.type][URL_PARAM][token.value.operator]?.[filterType];
      return Object.assign(acc, {
        [urlParam]: acc[urlParam] ? [acc[urlParam], token.value.data].flat() : token.value.data,
      });
    }, {});

export const convertToSearchQuery = (filterTokens) =>
  filterTokens
    .filter((token) => token.type === FILTERED_SEARCH_TERM && token.value.data)
    .map((token) => token.value.data)
    .join(' ') || undefined;