/**
 * Widget Registry
 * 
 * Central registry der håndterer widget discovery, queries og relationship management.
 * Gør det muligt for widgets at finde hinanden og etablere dataflow.
 */

import { 
  WidgetMetadata, 
  WidgetQuery, 
  WidgetRegistry, 
  DataType,
  securityWidgetSchemas,
  calendarScheduleWidgetSchemas
} from '@/types/WidgetSchema';

class WidgetRegistryImpl implements WidgetRegistry {
  widgets: Map<string, WidgetMetadata> = new Map();

  constructor() {
    // Initialize with security widget schemas
    Object.values(securityWidgetSchemas).forEach(widget => {
      this.register(widget);
    });
    // Initialize with calendar/schedule widget schemas
    Object.values(calendarScheduleWidgetSchemas).forEach(widget => {
      this.register(widget);
    });
  }

  register(widget: WidgetMetadata): void {
    this.widgets.set(widget.id, widget);
  }

  unregister(widgetId: string): void {
    this.widgets.delete(widgetId);
  }

  get(widgetId: string): WidgetMetadata | undefined {
    return this.widgets.get(widgetId);
  }

  // Find widgets that provide a specific data type
  findByCapability(type: DataType): WidgetMetadata[] {
    return Array.from(this.widgets.values()).filter(widget =>
      widget.provides.some(cap => cap.outputType === type)
    );
  }

  // Find widgets that require a specific data type
  findByRequirement(type: DataType): WidgetMetadata[] {
    return Array.from(this.widgets.values()).filter(widget =>
      widget.requires.some(req => req.type === type)
    );
  }

  // Find widgets that can connect to a given widget
  findCompatible(widgetId: string): WidgetMetadata[] {
    const widget = this.widgets.get(widgetId);
    if (!widget) return [];

    const compatible: Set<WidgetMetadata> = new Set();

    // Find widgets that can provide what this widget requires
    widget.requires.forEach(req => {
      this.findByCapability(req.type).forEach(provider => {
        if (provider.id !== widgetId) {
          compatible.add(provider);
        }
      });
    });

    // Find widgets that require what this widget provides
    widget.provides.forEach(cap => {
      this.findByRequirement(cap.outputType).forEach(consumer => {
        if (consumer.id !== widgetId) {
          compatible.add(consumer);
        }
      });
    });

    return Array.from(compatible);
  }

  // Advanced query for widget discovery
  query(query: WidgetQuery): WidgetMetadata[] {
    return Array.from(this.widgets.values()).filter(widget => {
      // Filter by provided type
      if (query.providesType && 
          !widget.provides.some(cap => cap.outputType === query.providesType)) {
        return false;
      }

      // Filter by specific capability
      if (query.providesCapability &&
          !widget.provides.some(cap => cap.id === query.providesCapability)) {
        return false;
      }

      // Filter by required type
      if (query.requiresType &&
          !widget.requires.some(req => req.type === query.requiresType)) {
        return false;
      }

      // Filter by required source
      if (query.requiresSource &&
          !widget.requires.some(req => req.source === query.requiresSource)) {
        return false;
      }

      // Filter by category
      if (query.category && widget.category !== query.category) {
        return false;
      }

      // Filter by tags
      if (query.tags && !query.tags.some(tag => widget.tags.includes(tag))) {
        return false;
      }

      // Filter by priority
      if (query.priority && widget.priority !== query.priority) {
        return false;
      }

      return true;
    });
  }

  // Get widgets that provide data to the given widget
  getProviders(widgetId: string): WidgetMetadata[] {
    const widget = this.widgets.get(widgetId);
    if (!widget) return [];

    return widget.relations
      .filter(rel => rel.type === 'depends_on')
      .map(rel => this.widgets.get(rel.targetWidgetId))
      .filter((w): w is WidgetMetadata => w !== undefined);
  }

  // Get widgets that consume data from the given widget
  getConsumers(widgetId: string): WidgetMetadata[] {
    const widget = this.widgets.get(widgetId);
    if (!widget) return [];

    return widget.relations
      .filter(rel => rel.type === 'provides_to')
      .map(rel => this.widgets.get(rel.targetWidgetId))
      .filter((w): w is WidgetMetadata => w !== undefined);
  }

  // Build complete dependency graph
  getDependencyGraph(): Map<string, string[]> {
    const graph = new Map<string, string[]>();

    this.widgets.forEach((widget, id) => {
      const dependencies = widget.relations
        .filter(rel => rel.type === 'depends_on')
        .map(rel => rel.targetWidgetId);
      graph.set(id, dependencies);
    });

    return graph;
  }

  // Get widget's introduction/description for ecosystem
  describeWidget(widgetId: string): string {
    const widget = this.widgets.get(widgetId);
    if (!widget) return 'Widget ikke fundet';

    const requires = widget.requires.map(r => `  - ${r.name} (${r.type}): ${r.description}`).join('\n');
    const provides = widget.provides.map(p => `  - ${p.name} (${p.outputType}): ${p.description}`).join('\n');
    const configs = widget.config.map(c => `  - ${c.name}: ${c.description}`).join('\n');

    return `
## ${widget.name} (v${widget.version})
${widget.description}

**Kategori:** ${widget.category}
**Tags:** ${widget.tags.join(', ')}
**Prioritet:** ${widget.priority || 'medium'}

### Kræver Data:
${requires || '  Ingen data-afhængigheder'}

### Leverer Data:
${provides || '  Ingen outputs'}

### Konfiguration:
${configs || '  Ingen konfigurerbare indstillinger'}

${widget.documentation ? `### Dokumentation:\n${widget.documentation}` : ''}
    `.trim();
  }

  // Export registry state for persistence or debugging
  export(): Record<string, WidgetMetadata> {
    const result: Record<string, WidgetMetadata> = {};
    this.widgets.forEach((widget, id) => {
      result[id] = widget;
    });
    return result;
  }
}

// Singleton instance
export const widgetRegistry = new WidgetRegistryImpl();

// React hook for widget discovery
export function useWidgetRegistry() {
  return widgetRegistry;
}