/**
 * EcoOS Logs View
 * Panel-wrapped terminal-style log viewer
 */

import {
  html,
  DeesElement,
  customElement,
  property,
  state,
  css,
  type TemplateResult,
} from '@design.estate/dees-element';
import { DeesPanel } from '@design.estate/dees-catalog';

import { sharedStyles } from '../styles/shared.js';

@customElement('ecoos-logs')
export class EcoosLogs extends DeesElement {
  @property({ type: Array })
  public accessor daemonLogs: string[] = [];

  @property({ type: Array })
  public accessor systemLogs: string[] = [];

  @state()
  private accessor activeTab: 'daemon' | 'system' = 'daemon';

  @state()
  private accessor autoScroll: boolean = true;

  public static styles = [
    sharedStyles,
    css`
      :host {
        display: block;
        padding: 16px;
      }

      .container {
        display: flex;
        flex-direction: column;
        height: calc(100vh - 140px);
        min-height: 300px;
      }

      .tabs {
        display: flex;
        gap: 0;
        border-bottom: 1px solid var(--border);
        margin-bottom: 12px;
      }

      .tab {
        padding: 8px 16px;
        font-size: var(--text-sm);
        font-weight: 500;
        color: var(--text-tertiary);
        cursor: pointer;
        border-bottom: 2px solid transparent;
        margin-bottom: -1px;
        transition: color 150ms ease;
      }

      .tab:hover {
        color: var(--text);
      }

      .tab.active {
        color: var(--text);
        border-bottom-color: var(--accent);
      }

      .header-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 8px;
      }

      .count {
        font-size: var(--text-xs);
        color: var(--text-tertiary);
        font-family: 'SF Mono', monospace;
      }

      .auto-scroll {
        display: flex;
        align-items: center;
        gap: 6px;
        font-size: var(--text-xs);
        color: var(--text-tertiary);
        cursor: pointer;
        padding: 4px 8px;
        border-radius: 4px;
        transition: background 150ms ease;
      }

      .auto-scroll:hover {
        background: var(--bg-hover);
      }

      .auto-scroll.active {
        color: var(--accent);
      }

      .auto-scroll .indicator {
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--text-tertiary);
      }

      .auto-scroll.active .indicator {
        background: var(--accent);
      }

      .terminal {
        flex: 1;
        background: hsl(0 0% 2%);
        font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
        font-size: 11px;
        line-height: 1.5;
        padding: 12px;
        overflow-y: auto;
        overflow-x: hidden;
        border-radius: 6px;
      }

      .line {
        white-space: pre-wrap;
        word-break: break-all;
        padding: 1px 0;
        color: var(--text-secondary);
      }

      .line.error {
        color: var(--error);
      }

      .line.warning {
        color: var(--warning);
      }

      .empty-logs {
        color: var(--text-tertiary);
        font-style: italic;
      }
    `,
  ];

  render(): TemplateResult {
    const logs = this.activeTab === 'daemon' ? this.daemonLogs : this.systemLogs;

    return html`
      <dees-panel .title=${'Logs'}>
        <div class="container">
          <div class="tabs">
            <div
              class="tab ${this.activeTab === 'daemon' ? 'active' : ''}"
              @click=${() => this.switchTab('daemon')}
            >Daemon</div>
            <div
              class="tab ${this.activeTab === 'system' ? 'active' : ''}"
              @click=${() => this.switchTab('system')}
            >System</div>
          </div>

          <div class="header-row">
            <span class="count">${logs.length} lines</span>
            <div
              class="auto-scroll ${this.autoScroll ? 'active' : ''}"
              @click=${this.toggleAutoScroll}
            >
              <span class="indicator"></span>
              Auto-scroll
            </div>
          </div>

          <div class="terminal" id="terminal" @scroll=${this.handleScroll}>
            ${logs.length === 0
              ? html`<div class="empty-logs">No logs</div>`
              : logs.map(log => html`<div class="line ${this.getLogLevel(log)}">${log}</div>`)
            }
          </div>
        </div>
      </dees-panel>
    `;
  }

  private getLogLevel(log: string): string {
    const lower = log.toLowerCase();
    if (lower.includes('error') || lower.includes('fail') || lower.includes('fatal')) {
      return 'error';
    }
    if (lower.includes('warn')) {
      return 'warning';
    }
    return '';
  }

  private switchTab(tab: 'daemon' | 'system'): void {
    this.activeTab = tab;
    if (this.autoScroll) {
      this.scrollToBottom();
    }
  }

  private toggleAutoScroll(): void {
    this.autoScroll = !this.autoScroll;
    if (this.autoScroll) {
      this.scrollToBottom();
    }
  }

  private handleScroll(): void {
    const terminal = this.shadowRoot?.getElementById('terminal');
    if (terminal) {
      const isAtBottom = terminal.scrollHeight - terminal.scrollTop <= terminal.clientHeight + 50;
      if (!isAtBottom && this.autoScroll) {
        this.autoScroll = false;
      }
    }
  }

  updated(changedProperties: Map<string, unknown>): void {
    super.updated(changedProperties);
    if ((changedProperties.has('daemonLogs') || changedProperties.has('systemLogs')) && this.autoScroll) {
      this.scrollToBottom();
    }
  }

  private scrollToBottom(): void {
    requestAnimationFrame(() => {
      const terminal = this.shadowRoot?.getElementById('terminal');
      if (terminal) {
        terminal.scrollTop = terminal.scrollHeight;
      }
    });
  }
}