OpenFrontIO/src/client/graphics/layers/AlertFrame.ts

import {
  BrokeAllianceUpdate,
  GameUpdateType,
} from "../../../core/game/GameUpdates";
import { LitElement, css, html } from "lit";
import { customElement, state } from "lit/decorators.js";
import { GameView } from "../../../core/game/GameView";
import { Layer } from "./Layer";
import { UserSettings } from "../../../core/game/UserSettings";

// Parameters for the alert animation
const ALERT_SPEED = 1.6;
const ALERT_COUNT = 2;

@customElement("alert-frame")
export class AlertFrame extends LitElement implements Layer {
  public game: GameView;
  private readonly userSettings: UserSettings = new UserSettings();

  @state()
  private isActive = false;

  private animationTimeout: number | null = null;

  static styles = css`
    .alert-border {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      border: 17px solid #ee0000;
      box-sizing: border-box;
      z-index: 40;
      opacity: 0;
    }

    .alert-border.animate {
      animation: alertBlink ${ALERT_SPEED}s ease-in-out ${ALERT_COUNT};
    }

    @keyframes alertBlink {
      0% {
        opacity: 0;
      }
      50% {
        opacity: 1;
      }
      100% {
        opacity: 0;
      }
    }
  `;

  constructor() {
    super();
    if (!document.querySelector("style[data-alert-frame]")) {
      const styleEl = document.createElement("style");
      styleEl.setAttribute("data-alert-frame", "");
      styleEl.textContent = AlertFrame.styles.cssText;
      document.head.appendChild(styleEl);
    }
  }

  createRenderRoot() {
    return this;
  }

  init() {
    // Listen for BrokeAllianceUpdate events directly from game updates
  }

  tick() {
    if (!this.game) {
      return; // Game not initialized yet
    }

    // Check for BrokeAllianceUpdate events
    this.game
      .updatesSinceLastTick()
      ?.[GameUpdateType.BrokeAlliance]?.forEach((update) => {
        this.onBrokeAllianceUpdate(update);
      });
  }

  // The alert frame is not affected by the camera transform
  shouldTransform(): boolean {
    return false;
  }

  private onBrokeAllianceUpdate(update: BrokeAllianceUpdate) {
    const myPlayer = this.game.myPlayer();
    if (!myPlayer) return;

    const betrayed = this.game.playerBySmallID(update.betrayedID);

    // Only trigger alert if the current player is the betrayed one
    if (betrayed === myPlayer) {
      this.activateAlert();
    }
  }

  private activateAlert() {
    if (this.userSettings.alertFrame()) {
      this.isActive = true;
      this.requestUpdate();
    }
  }

  public dismissAlert() {
    this.isActive = false;
    if (this.animationTimeout) {
      clearTimeout(this.animationTimeout);
      this.animationTimeout = null;
    }
    this.requestUpdate();
  }

  render() {
    if (!this.isActive) {
      return html``;
    }

    return html`
      <div
        class="alert-border animate"
        @animationend=${() => this.dismissAlert()}
      ></div>
    `;
  }
}