import { LitElement, html, css } from './plugins.js';
import type { CSSResult, TemplateResult } from './plugins.js';

export class SmartchatMessage extends LitElement {
  declare role: 'user' | 'assistant' | 'tool';
  declare content: string;
  declare toolName: string;
  declare timestamp: number;

  static properties = {
    role: { type: String },
    content: { type: String },
    toolName: { type: String },
    timestamp: { type: Number },
  };

  static styles: CSSResult = css`
    :host {
      display: block;
      animation: msg-in 0.3s ease-out both;
    }

    @keyframes msg-in {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* ── Message Row ── */
    .row {
      display: flex;
      gap: 10px;
      align-items: flex-end;
      margin-bottom: 4px;
    }

    .row.user {
      justify-content: flex-end;
    }

    .row.assistant {
      justify-content: flex-start;
    }

    /* ── Avatar ── */
    .avatar {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      flex-shrink: 0;
      line-height: 1;
    }

    .avatar.user {
      background: linear-gradient(135deg, #3b82f6, #2563eb);
      color: #fff;
      order: 2;
    }

    .avatar.assistant {
      background: linear-gradient(135deg, #6366f1, #7c3aed);
      color: #fff;
    }

    /* ── Bubble ── */
    .bubble {
      padding: 10px 14px;
      border-radius: 18px;
      word-break: break-word;
      white-space: pre-wrap;
      font-size: 14px;
      line-height: 1.55;
      max-width: min(75%, 480px);
    }

    .bubble.user {
      background: linear-gradient(135deg, #3b82f6, #2563eb);
      color: #fff;
      border-bottom-right-radius: 6px;
    }

    .bubble.assistant {
      background: var(--smartchat-assistant-bg, #1e1e2e);
      border: 1px solid var(--smartchat-assistant-border, rgba(255, 255, 255, 0.08));
      color: var(--smartchat-assistant-text, #d1d5db);
      border-bottom-left-radius: 6px;
    }

    /* ── Tool ── */
    .tool-row {
      display: flex;
      justify-content: flex-start;
      padding: 2px 0 2px 38px;
    }

    .tool-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      background: rgba(99, 102, 241, 0.1);
      border: 1px solid rgba(99, 102, 241, 0.15);
      border-radius: 20px;
      font-size: 11px;
      font-family: 'SF Mono', 'Fira Code', ui-monospace, monospace;
      color: #a5b4fc;
    }

    .tool-icon {
      font-size: 10px;
    }

    .tool-name {
      font-weight: 600;
    }

    /* ── Timestamp ── */
    .time-row {
      padding: 1px 38px 6px;
      font-size: 10px;
      color: rgba(255, 255, 255, 0.2);
      font-variant-numeric: tabular-nums;
    }

    .time-row.user {
      text-align: right;
    }

    .time-row.assistant {
      text-align: left;
    }
  `;

  constructor() {
    super();
    this.role = 'user';
    this.content = '';
    this.toolName = '';
    this.timestamp = 0;
  }

  private formatTime(ts: number): string {
    if (!ts) return '';
    const d = new Date(ts);
    return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
  }

  render(): TemplateResult {
    if (this.role === 'tool') {
      return html`
        <div class="tool-row">
          <div class="tool-pill">
            <span class="tool-icon">⚡</span>
            <span class="tool-name">${this.toolName || 'tool'}</span>
          </div>
        </div>
      `;
    }

    return html`
      <div class="row ${this.role}">
        <div class="avatar ${this.role}">
          ${this.role === 'user' ? '⬆' : '✦'}
        </div>
        <div class="bubble ${this.role}">
          ${this.content}
        </div>
      </div>
      ${this.timestamp
        ? html`<div class="time-row ${this.role}">${this.formatTime(this.timestamp)}</div>`
        : ''}
    `;
  }
}

customElements.define('smartchat-message', SmartchatMessage);