/**
 * @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 '@polymer/iron-icon/iron-icon';
import '../gr-avatar/gr-avatar';
import '../gr-button/gr-button';
import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
import '../../plugins/gr-endpoint-param/gr-endpoint-param';
import {getAppContext} from '../../../services/app-context';
import {accountKey, isSelf} from '../../../utils/account-util';
import {customElement, property} from 'lit/decorators';
import {
  AccountInfo,
  ChangeInfo,
  ServerInfo,
  ReviewInput,
} from '../../../types/common';
import {
  canHaveAttention,
  getAddedByReason,
  getLastUpdate,
  getReason,
  getRemovedByReason,
  hasAttention,
} from '../../../utils/attention-set-util';
import {ReviewerState} from '../../../constants/constants';
import {CURRENT} from '../../../utils/patch-set-util';
import {isInvolved, isRemovableReviewer} from '../../../utils/change-util';
import {assertIsDefined} from '../../../utils/common-util';
import {fontStyles} from '../../../styles/gr-font-styles';
import {css, html, LitElement} from 'lit';
import {HovercardMixin} from '../../../mixins/hovercard-mixin/hovercard-mixin';

// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
const base = HovercardMixin(LitElement);

@customElement('gr-hovercard-account')
export class GrHovercardAccount extends base {
  @property({type: Object})
  account!: AccountInfo;

  @property({type: Object})
  _selfAccount?: AccountInfo;

  /**
   * Optional ChangeInfo object, typically comes from the change page or
   * from a row in a list of search results. This is needed for some change
   * related features like adding the user as a reviewer.
   */
  @property({type: Object})
  change?: ChangeInfo;

  /**
   * Explains which labels the user can vote on and which score they can
   * give.
   */
  @property({type: String})
  voteableText?: string;

  /**
   * Should attention set related features be shown in the component? Note
   * that the information whether the user is in the attention set or not is
   * part of the ChangeInfo object in the change property.
   */
  @property({type: Boolean})
  highlightAttention = false;

  @property({type: Object})
  _config?: ServerInfo;

  private readonly restApiService = getAppContext().restApiService;

  private readonly reporting = getAppContext().reportingService;

  override connectedCallback() {
    super.connectedCallback();
    this.restApiService.getConfig().then(config => {
      this._config = config;
    });
    this.restApiService.getAccount().then(account => {
      this._selfAccount = account;
    });
  }

  static override get styles() {
    return [
      fontStyles,
      base.styles || [],
      css`
        .top,
        .attention,
        .status,
        .voteable {
          padding: var(--spacing-s) var(--spacing-l);
        }
        .statusPlugin {
          padding: var(--spacing-l) var(--spacing-l) var(--spacing-m);
        }
        .top {
          display: flex;
          padding-top: var(--spacing-xl);
          min-width: 300px;
        }
        gr-avatar {
          height: 48px;
          width: 48px;
          margin-right: var(--spacing-l);
        }
        .title,
        .email {
          color: var(--deemphasized-text-color);
        }
        .action {
          border-top: 1px solid var(--border-color);
          padding: var(--spacing-s) var(--spacing-l);
          --gr-button-padding: var(--spacing-s) var(--spacing-m);
        }
        .attention {
          background-color: var(--emphasis-color);
        }
        .attention a {
          text-decoration: none;
        }
        iron-icon {
          vertical-align: top;
        }
        .status iron-icon {
          width: 14px;
          height: 14px;
          position: relative;
          top: 2px;
        }
        iron-icon.attentionIcon {
          width: 14px;
          height: 14px;
          position: relative;
          top: 3px;
        }
        .reason {
          padding-top: var(--spacing-s);
        }
      `,
    ];
  }

  override render() {
    return html`
      <div id="container" role="tooltip" tabindex="-1">
        ${this.renderContent()}
      </div>
    `;
  }

  private renderContent() {
    if (!this._isShowing) return;
    return html`
      <div class="top">
        <div class="avatar">
          <gr-avatar .account=${this.account} imageSize="56"></gr-avatar>
        </div>
        <div class="account">
          <h3 class="name heading-3">${this.account.name}</h3>
          <div class="email">${this.account.email}</div>
        </div>
      </div>
      ${this.renderAccountStatusPlugins()} ${this.renderAccountStatus()}
      ${this.voteableText
        ? html`
            <div class="voteable">
              <span class="title">Voteable:</span>
              <span class="value">${this.voteableText}</span>
            </div>
          `
        : ''}
      ${this.renderNeedsAttention()} ${this.renderAddToAttention()}
      ${this.renderRemoveFromAttention()} ${this.renderReviewerOrCcActions()}
    `;
  }

  private renderReviewerOrCcActions() {
    if (!this._selfAccount || !isRemovableReviewer(this.change, this.account))
      return;
    return html`
      <div class="action">
        <gr-button
          class="removeReviewerOrCC"
          link=""
          no-uppercase
          @click="${this.handleRemoveReviewerOrCC}"
        >
          Remove ${this.computeReviewerOrCCText()}
        </gr-button>
      </div>
      <div class="action">
        <gr-button
          class="changeReviewerOrCC"
          link=""
          no-uppercase
          @click="${this.handleChangeReviewerOrCCStatus}"
        >
          ${this.computeChangeReviewerOrCCText()}
        </gr-button>
      </div>
    `;
  }

  private renderAccountStatusPlugins() {
    return html`
      <div class="statusPlugin">
        <gr-endpoint-decorator name="hovercard-status">
          <gr-endpoint-param
            name="account"
            .value="${this.account}"
          ></gr-endpoint-param>
        </gr-endpoint-decorator>
      </div>
    `;
  }

  private renderAccountStatus() {
    if (!this.account.status) return;
    return html`
      <div class="status">
        <span class="title">About me:</span>
        <span class="value">${this.account.status}</span>
      </div>
    `;
  }

  private renderNeedsAttention() {
    if (!(this.isAttentionEnabled && this.hasUserAttention)) return;
    const lastUpdate = getLastUpdate(this.account, this.change);
    return html`
      <div class="attention">
        <div>
          <iron-icon
            class="attentionIcon"
            icon="gr-icons:attention"
          ></iron-icon>
          <span> ${this.computePronoun()} turn to take this action. </span>
          <a
            href="https://gerrit-review.googlesource.com/Documentation/user-attention-set.html"
            target="_blank"
          >
            <iron-icon
              icon="gr-icons:help-outline"
              title="read documentation"
            ></iron-icon>
          </a>
        </div>
        <div class="reason">
          <span class="title">Reason:</span>
          <span class="value">
            ${getReason(this._config, this.account, this.change)}
          </span>
          ${lastUpdate
            ? html` (<gr-date-formatter
                  withTooltip
                  .dateStr="${lastUpdate}"
                ></gr-date-formatter
                >)`
            : ''}
        </div>
      </div>
    `;
  }

  private renderAddToAttention() {
    if (!this.computeShowActionAddToAttentionSet()) return;
    return html`
      <div class="action">
        <gr-button
          class="addToAttentionSet"
          link=""
          no-uppercase
          @click="${this.handleClickAddToAttentionSet}"
        >
          Add to attention set
        </gr-button>
      </div>
    `;
  }

  private renderRemoveFromAttention() {
    if (!this.computeShowActionRemoveFromAttentionSet()) return;
    return html`
      <div class="action">
        <gr-button
          class="removeFromAttentionSet"
          link=""
          no-uppercase
          @click="${this.handleClickRemoveFromAttentionSet}"
        >
          Remove from attention set
        </gr-button>
      </div>
    `;
  }

  // private but used by tests
  computePronoun() {
    if (!this.account || !this._selfAccount) return '';
    return isSelf(this.account, this._selfAccount) ? 'Your' : 'Their';
  }

  get isAttentionEnabled() {
    return (
      !!this.highlightAttention &&
      !!this.change &&
      canHaveAttention(this.account)
    );
  }

  get hasUserAttention() {
    return hasAttention(this.account, this.change);
  }

  private getReviewerState() {
    if (
      this.change!.reviewers[ReviewerState.REVIEWER]?.some(
        (reviewer: AccountInfo) =>
          reviewer._account_id === this.account._account_id
      )
    ) {
      return ReviewerState.REVIEWER;
    }
    return ReviewerState.CC;
  }

  private computeReviewerOrCCText() {
    if (!this.change || !this.account) return '';
    return this.getReviewerState() === ReviewerState.REVIEWER
      ? 'Reviewer'
      : 'CC';
  }

  private computeChangeReviewerOrCCText() {
    if (!this.change || !this.account) return '';
    return this.getReviewerState() === ReviewerState.REVIEWER
      ? 'Move Reviewer to CC'
      : 'Move CC to Reviewer';
  }

  private handleChangeReviewerOrCCStatus() {
    assertIsDefined(this.change, 'change');
    // accountKey() throws an error if _account_id & email is not found, which
    // we want to check before showing reloading toast
    const _accountKey = accountKey(this.account);
    this.dispatchEventThroughTarget('show-alert', {
      message: 'Reloading page...',
    });
    const reviewInput: Partial<ReviewInput> = {};
    reviewInput.reviewers = [
      {
        reviewer: _accountKey,
        state:
          this.getReviewerState() === ReviewerState.CC
            ? ReviewerState.REVIEWER
            : ReviewerState.CC,
      },
    ];

    this.restApiService
      .saveChangeReview(this.change._number, CURRENT, reviewInput)
      .then(response => {
        if (!response || !response.ok) {
          throw new Error(
            'something went wrong when toggling' + this.getReviewerState()
          );
        }
        this.dispatchEventThroughTarget('reload', {clearPatchset: true});
      });
  }

  private handleRemoveReviewerOrCC() {
    if (!this.change || !(this.account?._account_id || this.account?.email))
      throw new Error('Missing change or account.');
    this.dispatchEventThroughTarget('show-alert', {
      message: 'Reloading page...',
    });
    this.restApiService
      .removeChangeReviewer(
        this.change._number,
        (this.account?._account_id || this.account?.email)!
      )
      .then((response: Response | undefined) => {
        if (!response || !response.ok) {
          throw new Error('something went wrong when removing user');
        }
        this.dispatchEventThroughTarget('reload', {clearPatchset: true});
        return response;
      });
  }

  private computeShowActionAddToAttentionSet() {
    const involvedOrSelf =
      isInvolved(this.change, this._selfAccount) ||
      isSelf(this.account, this._selfAccount);
    return involvedOrSelf && this.isAttentionEnabled && !this.hasUserAttention;
  }

  private computeShowActionRemoveFromAttentionSet() {
    const involvedOrSelf =
      isInvolved(this.change, this._selfAccount) ||
      isSelf(this.account, this._selfAccount);
    return involvedOrSelf && this.isAttentionEnabled && this.hasUserAttention;
  }

  private handleClickAddToAttentionSet(e: MouseEvent) {
    if (!this.change || !this.account._account_id) return;
    this.dispatchEventThroughTarget('show-alert', {
      message: 'Saving attention set update ...',
      dismissOnNavigation: true,
    });

    // We are deliberately updating the UI before making the API call. It is a
    // risk that we are taking to achieve a better UX for 99.9% of the cases.
    const reason = getAddedByReason(this._selfAccount, this._config);

    if (!this.change.attention_set) this.change.attention_set = {};
    this.change.attention_set[this.account._account_id] = {
      account: this.account,
      reason,
      reason_account: this._selfAccount,
    };
    this.dispatchEventThroughTarget('attention-set-updated');

    this.reporting.reportInteraction(
      'attention-hovercard-add',
      this.reportingDetails()
    );
    this.restApiService
      .addToAttentionSet(this.change._number, this.account._account_id, reason)
      .then(() => {
        this.dispatchEventThroughTarget('hide-alert');
      });
    this.hide(e);
  }

  private handleClickRemoveFromAttentionSet(e: MouseEvent) {
    if (!this.change || !this.account._account_id) return;
    this.dispatchEventThroughTarget('show-alert', {
      message: 'Saving attention set update ...',
      dismissOnNavigation: true,
    });

    // We are deliberately updating the UI before making the API call. It is a
    // risk that we are taking to achieve a better UX for 99.9% of the cases.

    const reason = getRemovedByReason(this._selfAccount, this._config);
    if (this.change.attention_set)
      delete this.change.attention_set[this.account._account_id];
    this.dispatchEventThroughTarget('attention-set-updated');

    this.reporting.reportInteraction(
      'attention-hovercard-remove',
      this.reportingDetails()
    );
    this.restApiService
      .removeFromAttentionSet(
        this.change._number,
        this.account._account_id,
        reason
      )
      .then(() => {
        this.dispatchEventThroughTarget('hide-alert');
      });
    this.hide(e);
  }

  private reportingDetails() {
    const targetId = this.account._account_id;
    const ownerId =
      (this.change && this.change.owner && this.change.owner._account_id) || -1;
    const selfId = (this._selfAccount && this._selfAccount._account_id) || -1;
    const reviewers =
      this.change && this.change.reviewers && this.change.reviewers.REVIEWER
        ? [...this.change.reviewers.REVIEWER]
        : [];
    const reviewerIds = reviewers
      .map(r => r._account_id)
      .filter(rId => rId !== ownerId);
    return {
      actionByOwner: selfId === ownerId,
      actionByReviewer: selfId !== -1 && reviewerIds.includes(selfId),
      targetIsOwner: targetId === ownerId,
      targetIsReviewer: reviewerIds.includes(targetId),
      targetIsSelf: targetId === selfId,
    };
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'gr-hovercard-account': GrHovercardAccount;
  }
}