import * as plugins from '../plugins.js';
import * as shared from './shared/index.js';
import * as appstate from '../appstate.js';

import {
  DeesElement,
  customElement,
  html,
  state,
  css,
  cssManager,
} from '@design.estate/dees-element';

@customElement('ops-view-logs')
export class OpsViewLogs extends DeesElement {
  @state()
  accessor logState: appstate.ILogState = {
    recentLogs: [],
    isStreaming: false,
    filters: {},
  };

  @state()
  accessor filterLevel: string | undefined;

  @state()
  accessor filterCategory: string | undefined;

  @state()
  accessor filterLimit: number = 100;

  private lastPushedCount = 0;

  constructor() {
    super();
    const subscription = appstate.logStatePart
      .select((stateArg) => stateArg)
      .subscribe((logState) => {
        this.logState = logState;
      });
    this.rxSubscriptions.push(subscription);
  }

  public static styles = [
    cssManager.defaultStyles,
    shared.viewHostCss,
    css`
      .controls {
        display: flex;
        gap: 16px;
        margin-bottom: 24px;
        flex-wrap: wrap;
      }

      .filterGroup {
        display: flex;
        align-items: center;
        gap: 8px;
      }
    `,
  ];

  public render() {
    return html`
      <ops-sectionheading>Logs</ops-sectionheading>

      <div class="controls">
        <div class="filterGroup">
          <dees-button
            @click=${() => this.fetchLogs()}
          >
            Refresh Logs
          </dees-button>
        </div>

        <div class="filterGroup">
          <label>Level:</label>
          <dees-input-dropdown
            .options=${['all', 'debug', 'info', 'warn', 'error']}
            .selectedOption=${'all'}
            @selectedOption=${(e: any) => this.updateFilter('level', e.detail)}
          ></dees-input-dropdown>
        </div>

        <div class="filterGroup">
          <label>Category:</label>
          <dees-input-dropdown
            .options=${['all', 'smtp', 'dns', 'security', 'system', 'email']}
            .selectedOption=${'all'}
            @selectedOption=${(e: any) => this.updateFilter('category', e.detail)}
          ></dees-input-dropdown>
        </div>

        <div class="filterGroup">
          <label>Limit:</label>
          <dees-input-dropdown
            .options=${['50', '100', '200', '500']}
            .selectedOption=${'100'}
            @selectedOption=${(e: any) => this.updateFilter('limit', e.detail)}
          ></dees-input-dropdown>
        </div>
      </div>

      <dees-chart-log
        .label=${'Application Logs'}
        .autoScroll=${true}
        .maxEntries=${2000}
        .showMetrics=${true}
      ></dees-chart-log>
    `;
  }

  async connectedCallback() {
    super.connectedCallback();
    this.lastPushedCount = 0;
    // Only fetch if state is empty (streaming will handle new entries)
    if (this.logState.recentLogs.length === 0) {
      this.fetchLogs();
    }
  }

  async updated(changedProperties: Map<string, any>) {
    super.updated(changedProperties);
    if (changedProperties.has('logState')) {
      this.pushLogsToChart();
    }
  }

  private async pushLogsToChart() {
    const chartLog = this.shadowRoot?.querySelector('dees-chart-log') as any;
    if (!chartLog) return;

    // Ensure the chart element has finished its own initialization
    await chartLog.updateComplete;

    // Wait for xterm terminal to finish initializing (CDN load)
    if (!chartLog.terminalReady) {
      await new Promise<void>((resolve) => {
        const check = () => {
          if (chartLog.terminalReady) { resolve(); return; }
          setTimeout(check, 50);
        };
        check();
      });
    }

    const allEntries = this.getMappedLogEntries();
    if (this.lastPushedCount === 0 && allEntries.length > 0) {
      // Initial load: push all entries
      chartLog.updateLog(allEntries);
      this.lastPushedCount = allEntries.length;
    } else if (allEntries.length > this.lastPushedCount) {
      // Incremental: only push new entries
      const newEntries = allEntries.slice(this.lastPushedCount);
      chartLog.updateLog(newEntries);
      this.lastPushedCount = allEntries.length;
    }
  }

  private getMappedLogEntries() {
    return this.logState.recentLogs.map((log) => ({
      timestamp: new Date(log.timestamp).toISOString(),
      level: log.level as 'debug' | 'info' | 'warn' | 'error',
      message: log.message,
      source: log.category,
    }));
  }

  private async fetchLogs() {
    await appstate.logStatePart.dispatchAction(appstate.fetchRecentLogsAction, {
      limit: this.filterLimit,
      level: this.filterLevel as 'debug' | 'info' | 'warn' | 'error' | undefined,
      category: this.filterCategory as 'smtp' | 'dns' | 'security' | 'system' | 'email' | undefined,
    });
  }

  private updateFilter(type: string, value: string) {
    const resolved = value === 'all' ? undefined : value;

    switch (type) {
      case 'level':
        this.filterLevel = resolved;
        break;
      case 'category':
        this.filterCategory = resolved;
        break;
      case 'limit':
        this.filterLimit = resolved ? parseInt(resolved, 10) : 100;
        break;
    }

    this.fetchLogs();
  }
}