import { IRenderer, IRenderContext } from './IGroupingRenderer';
import { buildPipeline } from './RenderBuilder';
import { EventRenderer } from '../features/event/EventRenderer';
import { ViewConfig } from './ViewConfig';

export class CalendarOrchestrator {
  constructor(
    private allRenderers: IRenderer[],
    private eventRenderer: EventRenderer
  ) {}

  async render(viewConfig: ViewConfig, container: HTMLElement): Promise<void> {
    const headerContainer = container.querySelector('swp-calendar-header') as HTMLElement;
    const columnContainer = container.querySelector('swp-day-columns') as HTMLElement;
    if (!headerContainer || !columnContainer) {
      throw new Error('Missing swp-calendar-header or swp-day-columns');
    }

    // Byg filter fra viewConfig
    const filter: Record<string, string[]> = {};
    for (const grouping of viewConfig.groupings) {
      filter[grouping.type] = grouping.values;
    }

    const context: IRenderContext = { headerContainer, columnContainer, filter };

    // Clear
    headerContainer.innerHTML = '';
    columnContainer.innerHTML = '';

    // Sæt data-levels attribut for CSS grid-row styling
    const levels = viewConfig.groupings.map(g => g.type).join(' ');
    headerContainer.dataset.levels = levels;

    // Vælg renderers baseret på groupings types
    const activeRenderers = this.selectRenderers(viewConfig);

    // Beregn total kolonner dynamisk
    const totalColumns = this.calculateTotalColumns(viewConfig);
    container.style.setProperty('--grid-columns', String(totalColumns));

    // Byg og kør pipeline
    const pipeline = buildPipeline(activeRenderers);
    await pipeline.run(context);

    // Render events med hele filter (date + resource)
    await this.eventRenderer.render(container, filter);
  }

  private selectRenderers(viewConfig: ViewConfig): IRenderer[] {
    const types = viewConfig.groupings.map(g => g.type);
    // Sortér renderers i samme rækkefølge som viewConfig.groupings
    return types
      .map(type => this.allRenderers.find(r => r.type === type))
      .filter((r): r is IRenderer => r !== undefined);
  }

  private calculateTotalColumns(viewConfig: ViewConfig): number {
    const dateCount = viewConfig.groupings.find(g => g.type === 'date')?.values.length || 1;
    const resourceCount = viewConfig.groupings.find(g => g.type === 'resource')?.values.length || 1;
    return dateCount * resourceCount;
  }
}