// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {LitElement, html, css} from 'lit-element';
import page from 'page';
import qs from 'qs';

import '../mr-dropdown/mr-dropdown.js';
import {prpcClient} from 'prpc-client-instance.js';
import ClientLogger from 'monitoring/client-logger';
import {issueRefToUrl} from 'shared/convertersV0.js';

// Search field input regex testing for all digits
// indicating that the user wants to jump to the specified issue.
const JUMP_RE = /^\d+$/;

/**
 * `<mr-search-bar>`
 *
 * The searchbar for Monorail.
 *
 */
export class MrSearchBar extends LitElement {
  /** @override */
  static get styles() {
    return css`
      :host {
        --mr-search-bar-background: var(--chops-white);
        --mr-search-bar-border-radius: 4px;
        --mr-search-bar-border: var(--chops-normal-border);
        --mr-search-bar-chip-color: var(--chops-gray-200);
        height: 30px;
        font-size: var(--chops-large-font-size);
      }
      input#searchq {
        display: flex;
        align-items: center;
        justify-content: flex-start;
        flex-grow: 2;
        min-width: 100px;
        border: none;
        border-top: var(--mr-search-bar-border);
        border-bottom: var(--mr-search-bar-border);
        background: var(--mr-search-bar-background);
        height: 100%;
        box-sizing: border-box;
        padding: 0 2px;
        font-size: inherit;
      }
      mr-dropdown {
        text-align: right;
        display: flex;
        text-overflow: ellipsis;
        box-sizing: border-box;
        background: var(--mr-search-bar-background);
        border: var(--mr-search-bar-border);
        border-left: 0;
        border-radius: 0 var(--mr-search-bar-border-radius)
          var(--mr-search-bar-border-radius) 0;
        height: 100%;
        align-items: center;
        justify-content: center;
        text-decoration: none;
      }
      button {
        font-size: inherit;
        order: -1;
        background: var(--mr-search-bar-background);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100%;
        box-sizing: border-box;
        border: var(--mr-search-bar-border);
        border-left: none;
        border-right: none;
        padding: 0 8px;
      }
      form {
        display: flex;
        height: 100%;
        width: 100%;
        align-items: center;
        justify-content: flex-start;
        flex-direction: row;
      }
      i.material-icons {
        font-size: var(--chops-icon-font-size);
        color: var(--chops-primary-icon-color);
      }
      .select-container {
        order: -2;
        max-width: 150px;
        min-width: 50px;
        flex-shrink: 1;
        height: 100%;
        position: relative;
        box-sizing: border-box;
        border: var(--mr-search-bar-border);
        border-radius: var(--mr-search-bar-border-radius) 0 0
          var(--mr-search-bar-border-radius);
        background: var(--mr-search-bar-chip-color);
      }
      .select-container i.material-icons {
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        right: 0;
        top: 0;
        height: 100%;
        width: 20px;
        z-index: 2;
        padding: 0;
      }
      select {
        color: var(--chops-primary-font-color);
        display: flex;
        align-items: center;
        justify-content: flex-start;
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
        text-overflow: ellipsis;
        cursor: pointer;
        width: 100%;
        height: 100%;
        background: none;
        margin: 0;
        padding: 0 20px 0 8px;
        box-sizing: border-box;
        border: 0;
        z-index: 3;
        font-size: inherit;
        position: relative;
      }
      select::-ms-expand {
        display: none;
      }
      select::after {
        position: relative;
        right: 0;
        content: 'arrow_drop_down';
        font-family: 'Material Icons';
      }
    `;
  }

  /** @override */
  render() {
    return html`
      <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
      <form
        @submit=${this._submitSearch}
        @keypress=${this._submitSearchWithKeypress}
      >
        ${this._renderSearchScopeSelector()}
        <input
          id="searchq"
          type="text"
          name="q"
          placeholder="Search ${this.projectName} issues..."
          .value=${this.initialQuery || ''}
          autocomplete="off"
          aria-label="Search box"
          @focus=${this._searchEditStarted}
          @blur=${this._searchEditFinished}
          spellcheck="false"
        />
        <button type="submit">
          <i class="material-icons">search</i>
        </button>
        <mr-dropdown
          label="Search options"
          .items=${this._searchMenuItems}
        ></mr-dropdown>
      </form>
    `;
  }

  /**
   * Render helper for the select menu that lets user select which search
   * context/saved query they want to use.
   * @return {TemplateResult}
   */
  _renderSearchScopeSelector() {
    return html`
      <div class="select-container">
        <i class="material-icons" role="presentation">arrow_drop_down</i>
        <select
          id="can"
          name="can"
          @change=${this._redirectOnSelect}
          aria-label="Search scope"
        >
          <optgroup label="Search within">
            <option
              value="1"
              ?selected=${this.initialCan === '1'}
            >All issues</option>
            <option
              value="2"
              ?selected=${this.initialCan === '2'}
            >Open issues</option>
            <option
              value="3"
              ?selected=${this.initialCan === '3'}
            >Open and owned by me</option>
            <option
              value="4"
              ?selected=${this.initialCan === '4'}
            >Open and reported by me</option>
            <option
              value="5"
              ?selected=${this.initialCan === '5'}
            >Open and starred by me</option>
            <option
              value="8"
              ?selected=${this.initialCan === '8'}
            >Open with comment by me</option>
            <option
              value="6"
              ?selected=${this.initialCan === '6'}
            >New issues</option>
            <option
              value="7"
              ?selected=${this.initialCan === '7'}
            >Issues to verify</option>
          </optgroup>
          <optgroup label="Project queries" ?hidden=${!this.userDisplayName}>
            ${this._renderSavedQueryOptions(this.projectSavedQueries, 'project-query')}
            <option data-href="/p/${this.projectName}/adminViews">
              Manage project queries...
            </option>
          </optgroup>
          <optgroup label="My saved queries" ?hidden=${!this.userDisplayName}>
            ${this._renderSavedQueryOptions(this.userSavedQueries, 'user-query')}
            <option data-href="/u/${this.userDisplayName}/queries">
              Manage my saved queries...
            </option>
          </optgroup>
        </select>
      </div>
    `;
  }

  /**
   * Render helper for adding saved queries to the search scope select.
   * @param {Array<SavedQuery>} queries Queries to render.
   * @param {string} className CSS class to be applied to each option.
   * @return {Array<TemplateResult>}
   */
  _renderSavedQueryOptions(queries, className) {
    if (!queries) return;
    return queries.map((query) => html`
      <option
        class=${className}
        value=${query.queryId}
        ?selected=${this.initialCan === query.queryId}
      >${query.name}</option>
    `);
  }

  /** @override */
  static get properties() {
    return {
      projectName: {type: String},
      userDisplayName: {type: String},
      initialCan: {type: String},
      initialQuery: {type: String},
      projectSavedQueries: {type: Array},
      userSavedQueries: {type: Array},
      queryParams: {type: Object},
      keptQueryParams: {type: Array},
    };
  }

  /** @override */
  constructor() {
    super();
    this.queryParams = {};
    this.keptQueryParams = [
      'sort',
      'groupby',
      'colspec',
      'x',
      'y',
      'mode',
      'cells',
      'num',
    ];
    this.initialQuery = '';
    this.initialCan = '2';
    this.projectSavedQueries = [];
    this.userSavedQueries = [];

    this.clientLogger = new ClientLogger('issues');

    this._page = page;
  }

  /** @override */
  connectedCallback() {
    super.connectedCallback();

    // Global event listeners. Make sure to unbind these when the
    // element disconnects.
    this._boundFocus = this.focus.bind(this);
    window.addEventListener('focus-search', this._boundFocus);
  }

  /** @override */
  disconnectedCallback() {
    super.disconnectedCallback();

    window.removeEventListener('focus-search', this._boundFocus);
  }

  /** @override */
  updated(changedProperties) {
    if (this.userDisplayName && changedProperties.has('userDisplayName')) {
      const userSavedQueriesPromise = prpcClient.call('monorail.Users',
          'GetSavedQueries', {});
      userSavedQueriesPromise.then((resp) => {
        this.userSavedQueries = resp.savedQueries;
      });
    }
  }

  /**
   * Sends an event to ClientLogger describing that the user started typing
   * a search query.
   */
  _searchEditStarted() {
    this.clientLogger.logStart('query-edit', 'user-time');
    this.clientLogger.logStart('issue-search', 'user-time');
  }

  /**
   * Sends an event to ClientLogger saying that the user finished typing a
   * search.
   */
  _searchEditFinished() {
    this.clientLogger.logEnd('query-edit');
  }

  /**
   * On Shift+Enter, this handler opens the search in a new tab.
   * @param {KeyboardEvent} e
   */
  _submitSearchWithKeypress(e) {
    if (e.key === 'Enter' && (e.shiftKey)) {
      const form = e.currentTarget;
      this._runSearch(form, true);
    }
    // In all other cases, we want to let the submit handler do the work.
    // ie: pressing 'Enter' on a form should natively open it in a new tab.
  }

  /**
   * Update the URL on form submit.
   * @param {Event} e
   */
  _submitSearch(e) {
    e.preventDefault();

    const form = e.target;
    this._runSearch(form);
  }

  /**
   * Updates the URL with the new search set in the query string.
   * @param {HTMLFormElement} form the native form element to submit.
   * @param {boolean=} newTab whether to open the search in a new tab.
   */
  _runSearch(form, newTab) {
    this.clientLogger.logEnd('query-edit');
    this.clientLogger.logPause('issue-search', 'user-time');
    this.clientLogger.logStart('issue-search', 'computer-time');

    const params = {};

    this.keptQueryParams.forEach((param) => {
      if (param in this.queryParams) {
        params[param] = this.queryParams[param];
      }
    });

    params.q = form.q.value.trim();
    params.can = form.can.value;

    this._navigateToNext(params, newTab);
  }

  /**
   * Attempt to jump-to-issue, otherwise continue to list view
   * @param {Object} params URL navigation parameters
   * @param {boolean} newTab
   */
  async _navigateToNext(params, newTab = false) {
    let resp;
    if (JUMP_RE.test(params.q)) {
      const message = {
        issueRef: {
          projectName: this.projectName,
          localId: params.q,
        },
      };

      try {
        resp = await prpcClient.call(
            'monorail.Issues', 'GetIssue', message,
        );
      } catch (error) {
        // Fall through to navigateToList
      }
    }
    if (resp && resp.issue) {
      const link = issueRefToUrl(resp.issue, params);
      this._page(link);
    } else {
      this._navigateToList(params, newTab);
    }
  }

  /**
   * Navigate to list view, currently splits on old and new view
   * @param {Object} params URL navigation parameters
   * @param {boolean} newTab
   * @fires Event#refreshList
   * @private
   */
  _navigateToList(params, newTab = false) {
    const pathname = `/p/${this.projectName}/issues/list`;

    const hasChanges = !window.location.pathname.startsWith(pathname) ||
      this.queryParams.q !== params.q ||
      this.queryParams.can !== params.can;

    const url =`${pathname}?${qs.stringify(params)}`;

    if (newTab) {
      window.open(url, '_blank', 'noopener');
    } else if (hasChanges) {
      this._page(url);
    } else {
      // TODO(zhangtiff): Replace this event with Redux once all of Monorail
      // uses Redux.
      // This is needed because navigating to the exact same page does not
      // cause a URL change to happen.
      this.dispatchEvent(new Event('refreshList',
          {'composed': true, 'bubbles': true}));
    }
  }

  /**
   * Wrap the native focus() function for the search form to allow parent
   * elements to focus the search.
   */
  focus() {
    const search = this.shadowRoot.querySelector('#searchq');
    search.focus();
  }

  /**
   * Populates the search dropdown.
   * @return {Array<MenuItem>}
   */
  get _searchMenuItems() {
    const projectName = this.projectName;
    return [
      {
        text: 'Advanced search',
        url: `/p/${projectName}/issues/advsearch`,
      },
      {
        text: 'Search tips',
        url: `/p/${projectName}/issues/searchtips`,
      },
    ];
  }

  /**
   * The search dropdown includes links like "Manage my saved queries..."
   * that automatically navigate a user to a new page when they select those
   * options.
   * @param {Event} evt
   */
  _redirectOnSelect(evt) {
    const target = evt.target;
    const option = target.options[target.selectedIndex];

    if (option.dataset.href) {
      this._page(option.dataset.href);
    }
  }
}

customElements.define('mr-search-bar', MrSearchBar);