/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import persistState from 'redux-localstorage';
import { pickBy } from 'lodash';
import { isFeatureEnabled, FeatureFlag } from '@superset-ui/core';
import { filterUnsavedQueryEditorList } from 'src/SqlLab/components/EditorAutoSync';
import {
  emptyTablePersistData,
  emptyQueryResults,
  clearQueryEditors,
} from '../utils/reduxStateToLocalStorageHelper';
import { BYTES_PER_CHAR, KB_STORAGE } from '../constants';

const CLEAR_ENTITY_HELPERS_MAP = {
  tables: emptyTablePersistData,
  queries: emptyQueryResults,
  queryEditors: clearQueryEditors,
  unsavedQueryEditor: qe => clearQueryEditors([qe])[0],
};

const sqlLabPersistStateConfig = {
  paths: ['sqlLab'],
  config: {
    slicer: paths => state => {
      const subset = {};
      paths.forEach(path => {
        if (isFeatureEnabled(FeatureFlag.SqllabBackendPersistence)) {
          const {
            queryEditors,
            editorTabLastUpdatedAt,
            unsavedQueryEditor,
            tables,
            queries,
            tabHistory,
            lastUpdatedActiveTab,
            destroyedQueryEditors,
          } = state.sqlLab;
          const unsavedQueryEditors = filterUnsavedQueryEditorList(
            queryEditors,
            unsavedQueryEditor,
            editorTabLastUpdatedAt,
          );
          const hasUnsavedActiveTabState =
            tabHistory.slice(-1)[0] !== lastUpdatedActiveTab;
          const hasUnsavedDeletedQueryEditors =
            Object.keys(destroyedQueryEditors).length > 0;
          if (
            unsavedQueryEditors.length > 0 ||
            hasUnsavedActiveTabState ||
            hasUnsavedDeletedQueryEditors
          ) {
            const hasFinishedMigrationFromLocalStorage =
              unsavedQueryEditors.every(
                ({ inLocalStorage }) => !inLocalStorage,
              );
            subset.sqlLab = {
              queryEditors: unsavedQueryEditors,
              ...(!hasFinishedMigrationFromLocalStorage && {
                tabHistory,
                tables: tables.filter(table => table.inLocalStorage),
                queries: pickBy(
                  queries,
                  query => query.inLocalStorage && !query.isDataPreview,
                ),
              }),
              ...(hasUnsavedActiveTabState && {
                tabHistory,
              }),
              destroyedQueryEditors,
            };
          }
          return;
        }
        // this line is used to remove old data from browser localStorage.
        // we used to persist all redux state into localStorage, but
        // it caused configurations passed from server-side got override.
        // see PR 6257 for details
        delete state[path].common; // eslint-disable-line no-param-reassign
        if (path === 'sqlLab') {
          subset[path] = Object.fromEntries(
            Object.entries(state[path]).map(([key, value]) => [
              key,
              CLEAR_ENTITY_HELPERS_MAP[key]?.(value) ?? value,
            ]),
          );
        }
      });

      const data = JSON.stringify(subset);
      // 2 digit precision
      const currentSize =
        Math.round(((data.length * BYTES_PER_CHAR) / KB_STORAGE) * 100) / 100;
      if (state.localStorageUsageInKilobytes !== currentSize) {
        state.localStorageUsageInKilobytes = currentSize; // eslint-disable-line no-param-reassign
      }

      return subset;
    },
    merge: (initialState, persistedState = {}) => {
      const result = {
        ...initialState,
        ...persistedState,
        sqlLab: {
          ...(persistedState?.sqlLab || {}),
          // Overwrite initialState over persistedState for sqlLab
          // since a logic in getInitialState overrides the value from persistedState
          ...initialState.sqlLab,
        },
      };
      return result;
    },
  },
};

// TODO: requires redux-localstorage > 1.0 for typescript support
/** @type {any} */
export const persistSqlLabStateEnhancer = persistState(
  sqlLabPersistStateConfig.paths,
  sqlLabPersistStateConfig.config,
);