import { html, css, LitElement } from "lit";
import { customElement, state } from "lit/decorators.js";
import { getLastBlockHeight } from "@utils/lastBlockHeight";

@customElement("arx-bitcoin-block-widget")
export class BitcoinBlockWidget extends LitElement {
  @state()
  private lastBlock: number | null = null;

  @state()
  private isLoading = true;

  @state()
  private error: string | null = null;

  private REFRESH_INTERVAL = 5000;

  @state()
  private timer: number | null = null;

  constructor() {
    super();
    this.loadBlockHeight();
    this.timer = window.setInterval(
      this.loadBlockHeight,
      this.REFRESH_INTERVAL
    );
  }

  override disconnectedCallback() {
    super.disconnectedCallback();
    if (this.timer) clearInterval(this.timer);
  }

  async loadBlockHeight() {
    try {
      const response = await getLastBlockHeight();
      this.lastBlock = response.height;
      this.error = null;
    } catch (error) {
      this.error = "Failed to load block height";
      console.error(error);
    } finally {
      this.isLoading = false;
    }
  }

  static override styles = [
    css`
      .error {
        color: #dc3545;
        padding: 0.5rem;
        border-radius: 4px;
        background: #f8d7da;
      }

      .loading {
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .block-height {
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .label {
        font-weight: 500;
      }

      .value {
        font-size: 1.25rem;
        font-weight: 600;
      }
    `,
  ];

  override render() {
    if (this.error) {
      return html`<div class="error">${this.error}</div>`;
    }

    if (this.isLoading) {
      return html`
        <div class="loading">
          <span class="loader"></span>
          Loading latest block...
        </div>
      `;
    }

    return html`
      <div class="block-height">
        <span class="label">Last Block:</span>
        <span class="value">${this.lastBlock?.toLocaleString()}</span>
      </div>
    `;
  }
}