/**
 * @license
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed 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 {html} from 'lit-html';
import {css, customElement, property} from 'lit-element';
import {GrLitElement} from '../lit/gr-lit-element';
import {Action, CheckResult, CheckRun} from '../../api/checks';
import {
  allActions$,
  allResults$,
  allRuns$,
} from '../../services/checks/checks-model';
import './gr-checks-runs';
import './gr-checks-results';
import {sharedStyles} from '../../styles/shared-styles';
import {changeNum$, currentPatchNum$} from '../../services/change/change-model';
import {NumericChangeId, PatchSetNum} from '../../types/common';
import {
  ActionTriggeredEvent,
  fireActionTriggered,
} from '../../services/checks/checks-util';
import {
  checkRequiredProperty,
  toggleSetMembership,
} from '../../utils/common-util';
import {RunSelectedEvent} from './gr-checks-runs';

/**
 * The "Checks" tab on the Gerrit change page. Gets its data from plugins that
 * have registered with the Checks Plugin API.
 */
@customElement('gr-checks-tab')
export class GrChecksTab extends GrLitElement {
  @property()
  runs: CheckRun[] = [];

  results: CheckResult[] = [];

  actions: Action[] = [];

  @property()
  currentPatchNum: PatchSetNum | undefined = undefined;

  @property()
  changeNum: NumericChangeId | undefined = undefined;

  private selectedRuns = new Set<string>();

  constructor() {
    super();
    this.subscribe('runs', allRuns$);
    this.subscribe('actions', allActions$);
    this.subscribe('results', allResults$);
    this.subscribe('currentPatchNum', currentPatchNum$);
    this.subscribe('changeNum', changeNum$);

    this.addEventListener('action-triggered', (e: ActionTriggeredEvent) =>
      this.handleActionTriggered(e.detail.action, e.detail.run)
    );
  }

  static get styles() {
    return [
      sharedStyles,
      css`
        :host {
          display: block;
        }
        .header {
          display: flex;
          justify-content: space-between;
          padding: var(--spacing-m) var(--spacing-l);
          border-bottom: 1px solid var(--border-color);
        }
        .action {
          margin-left: var(--spacing-m);
        }
        .container {
          display: flex;
        }
        .runs {
          min-width: 300px;
          min-height: 400px;
          border-right: 1px solid var(--border-color);
        }
        .results {
          background-color: var(--background-color-secondary);
          flex-grow: 1;
        }
      `,
    ];
  }

  render() {
    const ps = `Patchset ${this.currentPatchNum} (Latest)`;
    const filteredRuns = this.runs.filter(
      r => this.selectedRuns.size === 0 || this.selectedRuns.has(r.checkName)
    );
    return html`
      <div class="header">
        <div class="left">
          <gr-dropdown-list
            value="${ps}"
            .items="${[
              {
                value: `${ps}`,
                text: `${ps}`,
              },
            ]}"
          ></gr-dropdown-list>
        </div>
        <div class="right">
          ${this.actions.map(this.renderAction)}
        </div>
      </div>
      <div class="container">
        <gr-checks-runs
          class="runs"
          .runs="${this.runs}"
          @run-selected="${this.handleRunSelected}"
        ></gr-checks-runs>
        <gr-checks-results
          class="results"
          .runs="${filteredRuns}"
        ></gr-checks-results>
      </div>
    `;
  }

  renderAction(action: Action) {
    return html`<gr-checks-top-level-action
      .action="${action}"
    ></gr-checks-top-level-action>`;
  }

  handleActionTriggered(action: Action, run?: CheckRun) {
    if (!this.changeNum) return;
    if (!this.currentPatchNum) return;
    // TODO(brohlfs): The callback is supposed to be returning a promise.
    // A toast should be displayed until the promise completes. And then the
    // data should be updated.
    action.callback(
      this.changeNum,
      this.currentPatchNum as number,
      run?.attempt,
      run?.externalId,
      run?.checkName,
      action.name
    );
  }

  handleRunSelected(e: RunSelectedEvent) {
    toggleSetMembership(this.selectedRuns, e.detail.checkName);
    this.requestUpdate();
  }
}

@customElement('gr-checks-top-level-action')
export class GrChecksTopLevelAction extends GrLitElement {
  @property()
  action!: Action;

  connectedCallback() {
    super.connectedCallback();
    checkRequiredProperty(this.action, 'action');
  }

  render() {
    return html`
      <gr-button link class="action" @click="${this.handleClick}"
        >${this.action.name}</gr-button
      >
    `;
  }

  handleClick() {
    fireActionTriggered(this, this.action);
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'gr-checks-tab': GrChecksTab;
    'gr-checks-top-level-action': GrChecksTopLevelAction;
  }
}