import { z } from 'zod';
import { reportError } from '@/lib/error-handling';
import { BaseService } from '@/lib/service-base';
import { SERVICE_CONFIGS } from '@/lib/service-config';

// Response schemas
const connectionStatisticsSchema = z.object({
  total_connections: z.number().nonnegative(),
  active_connections: z.number().nonnegative(),
  potential_connections: z.number().nonnegative(),
});

const itemCountSchema = z.object({
  item: z.string(),
  count: z.number().nonnegative(),
});

const supplyDemandAnalysisSchema = z.object({
  top_needs: z.array(itemCountSchema),
  top_offers: z.array(itemCountSchema),
});

const dashboardStatisticsSchema = z.object({
  total_organizations: z.number().nonnegative(),
  total_sites: z.number().nonnegative(),
  total_resource_flows: z.number().nonnegative(),
  total_matches: z.number().nonnegative(),
  active_proposals: z.number().nonnegative(),
  recent_activity: z.array(z.object({
    id: z.string(),
    type: z.string(),
    description: z.string(),
    timestamp: z.string(),
  })),
});

// Type exports (keeping for backward compatibility)
export interface ConnectionStatistics {
  total_connections: number;
  active_connections: number;
  potential_connections: number;
}

export interface ItemCount {
  item: string;
  count: number;
}

export interface SupplyDemandAnalysis {
  top_needs: ItemCount[];
  top_offers: ItemCount[];
}

export interface DashboardStatistics {
  total_organizations: number;
  total_sites: number;
  total_resource_flows: number;
  total_matches: number;
  active_proposals: number;
  recent_activity: Array<{
    id: string;
    type: string;
    description: string;
    timestamp: string;
  }>;
}

/**
 * Analytics Service
 * Handles all analytics-related API operations with improved reliability and type safety
 */
class AnalyticsService extends BaseService {
  constructor() {
    super(SERVICE_CONFIGS.ANALYTICS);
  }

  /**
   * Get connection statistics
   */
  async getConnectionStatistics(): Promise<ConnectionStatistics> {
    const result = await this.get('connections', connectionStatisticsSchema, undefined, {
      context: 'getConnectionStatistics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch connection statistics'),
        { operation: 'getConnectionStatistics' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get supply and demand analysis
   */
  async getSupplyDemandAnalysis(): Promise<SupplyDemandAnalysis> {
    const result = await this.get('supply-demand', supplyDemandAnalysisSchema, undefined, {
      context: 'getSupplyDemandAnalysis',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch supply demand analysis'),
        { operation: 'getSupplyDemandAnalysis' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get dashboard statistics
   */
  async getDashboardStatistics(): Promise<DashboardStatistics> {
    const result = await this.get('dashboard', dashboardStatisticsSchema, undefined, {
      context: 'getDashboardStatistics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch dashboard statistics'),
        { operation: 'getDashboardStatistics' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get platform statistics
   */
  async getPlatformStatistics(): Promise<any> {
    const result = await this.get('platform-stats', z.any(), undefined, {
      context: 'getPlatformStatistics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch platform statistics'),
        { operation: 'getPlatformStatistics' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get matching statistics
   */
  async getMatchingStatistics(): Promise<any> {
    const result = await this.get('matching-stats', z.any(), undefined, {
      context: 'getMatchingStatistics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch matching statistics'),
        { operation: 'getMatchingStatistics' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get resource flow statistics
   */
  async getResourceFlowStatistics(): Promise<any> {
    const result = await this.get('resource-flow-stats', z.any(), undefined, {
      context: 'getResourceFlowStatistics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch resource flow statistics'),
        { operation: 'getResourceFlowStatistics' }
      );
      throw error;
    }

    return result.data;
  }

  /**
   * Get impact metrics
   */
  async getImpactMetrics(): Promise<any> {
    const result = await this.get('impact-metrics', z.any(), undefined, {
      context: 'getImpactMetrics',
    });

    if (!result.success) {
      const error = reportError(
        new Error(result.error?.message || 'Failed to fetch impact metrics'),
        { operation: 'getImpactMetrics' }
      );
      throw error;
    }

    return result.data;
  }
}

// Create and export service instance
const analyticsService = new AnalyticsService();

// Export service instance for direct usage
export { analyticsService };

// Export service methods directly for cleaner imports
export const getConnectionStatistics = analyticsService.getConnectionStatistics.bind(analyticsService);
export const getSupplyDemandAnalysis = analyticsService.getSupplyDemandAnalysis.bind(analyticsService);
export const getDashboardStatistics = analyticsService.getDashboardStatistics.bind(analyticsService);
export const getPlatformStatistics = analyticsService.getPlatformStatistics.bind(analyticsService);
export const getMatchingStatistics = analyticsService.getMatchingStatistics.bind(analyticsService);
export const getResourceFlowStatistics = analyticsService.getResourceFlowStatistics.bind(analyticsService);
export const getImpactMetrics = analyticsService.getImpactMetrics.bind(analyticsService);