/**
 * Copyright 2018-present Facebook.
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 * @format
 */

import type {PluginClient, ElementSearchResultSet} from 'flipper';
import type {PersistedState} from './';

import {
  SearchInput,
  SearchBox,
  SearchIcon,
  LoadingIndicator,
  styled,
  colors,
} from 'flipper';
import {Component} from 'react';

type SearchResultTree = {|
  id: string,
  isMatch: Boolean,
  hasChildren: boolean,
  children: ?Array<SearchResultTree>,
  element: Element,
  axElement: Element,
|};

type Props = {
  client: PluginClient,
  inAXMode: boolean,
  onSearchResults: (searchResults: ElementSearchResultSet) => void,
  setPersistedState: (state: $Shape<PersistedState>) => void,
  persistedState: PersistedState,
};

type State = {
  value: string,
  outstandingSearchQuery: ?string,
};

const LoadingSpinner = styled(LoadingIndicator)({
  marginRight: 4,
  marginLeft: 3,
  marginTop: -1,
});

export default class Search extends Component<Props, State> {
  state = {
    value: '',
    outstandingSearchQuery: null,
  };

  timer: TimeoutID;

  onChange = (e: SyntheticInputEvent<>) => {
    clearTimeout(this.timer);
    this.setState({
      value: e.target.value,
    });
    this.timer = setTimeout(() => this.performSearch(e.target.value), 200);
  };

  onKeyDown = (e: SyntheticKeyboardEvent<>) => {
    if (e.key === 'Enter') {
      this.performSearch(this.state.value);
    }
  };

  performSearch(query: string) {
    this.setState({
      outstandingSearchQuery: query,
    });

    if (!query) {
      this.displaySearchResults({query: '', results: null});
    } else {
      this.props.client
        .call('getSearchResults', {query, axEnabled: this.props.inAXMode})
        .then(response => this.displaySearchResults(response));
    }
  }

  displaySearchResults({
    results,
    query,
  }: {
    results: ?SearchResultTree,
    query: string,
  }) {
    this.setState({
      outstandingSearchQuery:
        query === this.state.outstandingSearchQuery
          ? null
          : this.state.outstandingSearchQuery,
    });

    const elements = this.getElementsFromSearchResultTree(results);
    const expandedElements = elements.reduce(
      (acc, {element}) => ({
        ...acc,
        [element.id]: {...element, expanded: true},
      }),
      {},
    );

    this.props.setPersistedState({
      elements: {
        ...this.props.persistedState.elements,
        ...expandedElements,
      },
    });

    this.props.onSearchResults({
      matches: new Set(elements.filter(x => x.isMatch).map(x => x.element.id)),
      query: query,
    });
  }

  getElementsFromSearchResultTree(
    tree: ?SearchResultTree,
  ): Array<SearchResultTree> {
    if (!tree) {
      return [];
    }
    let elements = [
      {
        id: tree.id,
        isMatch: tree.isMatch,
        hasChildren: Boolean(tree.children),
        element: tree.element,
        axElement: tree.axElement,
      },
    ];
    if (tree.children) {
      for (const child of tree.children) {
        elements = elements.concat(this.getElementsFromSearchResultTree(child));
      }
    }
    return elements;
  }

  render() {
    return (
      <SearchBox tabIndex={-1}>
        <SearchIcon
          name="magnifying-glass"
          color={colors.macOSTitleBarIcon}
          size={16}
        />
        <SearchInput
          placeholder={'Search'}
          onChange={this.onChange}
          onKeyDown={this.onKeyDown}
          value={this.state.value}
        />
        {this.state.outstandingSearchQuery && <LoadingSpinner size={16} />}
      </SearchBox>
    );
  }
}