// frontend/src/api/services/forecasting.service.ts
/**
 * Forecasting Service
 * Handles forecast operations and predictions
 */

import { apiClient } from '../client';
import { RequestTimeouts } from '../client/config';
import type {
  SingleForecastRequest,
  BatchForecastRequest,
  ForecastResponse,
  BatchForecastResponse,
  ForecastAlert,
  QuickForecast,
  PaginatedResponse,
  BaseQueryParams,
} from '../types';

export class ForecastingService {
  /**
   * Create Single Product Forecast
   */
  async createSingleForecast(
    tenantId: string,
    request: SingleForecastRequest
  ): Promise<ForecastResponse[]> {
    return apiClient.post(
      `/tenants/${tenantId}/forecasts/single`,
      request,
      {
        timeout: RequestTimeouts.MEDIUM,
      }
    );
  }

  /**
   * Create Batch Forecast
   */
  async createBatchForecast(
    tenantId: string,
    request: BatchForecastRequest
  ): Promise<BatchForecastResponse> {
    return apiClient.post(
      `/tenants/${tenantId}/forecasts/batch`,
      request,
      {
        timeout: RequestTimeouts.LONG,
      }
    );
  }

  /**
   * Get Forecast by ID
   */
  async getForecast(tenantId: string, forecastId: string): Promise<ForecastResponse> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/${forecastId}`);
  }

  /**
   * Get Forecasts
   */
  async getForecasts(
    tenantId: string,
    params?: BaseQueryParams & {
      product_name?: string;
      start_date?: string;
      end_date?: string;
      model_id?: string;
    }
  ): Promise<PaginatedResponse<ForecastResponse>> {
    return apiClient.get(`/tenants/${tenantId}/forecasts`, { params });
  }

  /**
   * Get Batch Forecast Status
   */
  async getBatchForecastStatus(
    tenantId: string,
    batchId: string
  ): Promise<BatchForecastResponse> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/batch/${batchId}/status`);
  }

  /**
   * Get Batch Forecasts
   */
  async getBatchForecasts(
    tenantId: string,
    params?: BaseQueryParams & {
      status?: string;
      start_date?: string;
      end_date?: string;
    }
  ): Promise<PaginatedResponse<BatchForecastResponse>> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/batch`, { params });
  }

  /**
   * Cancel Batch Forecast
   */
  async cancelBatchForecast(tenantId: string, batchId: string): Promise<{ message: string }> {
    return apiClient.post(`/tenants/${tenantId}/forecasts/batch/${batchId}/cancel`);
  }

  /**
   * Get Quick Forecasts for Dashboard
   */
  async getQuickForecasts(tenantId: string, limit?: number): Promise<QuickForecast[]> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/quick`, {
      params: { limit },
    });
  }

  /**
   * Get Forecast Alerts
   */
  async getForecastAlerts(
    tenantId: string,
    params?: BaseQueryParams & {
      is_active?: boolean;
      severity?: string;
      alert_type?: string;
    }
  ): Promise<PaginatedResponse<ForecastAlert>> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/alerts`, { params });
  }

  /**
   * Acknowledge Forecast Alert
   */
  async acknowledgeForecastAlert(
    tenantId: string,
    alertId: string
  ): Promise<ForecastAlert> {
    return apiClient.post(`/tenants/${tenantId}/forecasts/alerts/${alertId}/acknowledge`);
  }

  /**
   * Delete Forecast
   */
  async deleteForecast(tenantId: string, forecastId: string): Promise<{ message: string }> {
    return apiClient.delete(`/tenants/${tenantId}/forecasts/${forecastId}`);
  }

  /**
   * Export Forecasts
   */
  async exportForecasts(
    tenantId: string,
    format: 'csv' | 'excel' | 'json',
    params?: {
      product_name?: string;
      start_date?: string;
      end_date?: string;
    }
  ): Promise<Blob> {
    const response = await apiClient.request(`/tenants/${tenantId}/forecasts/export`, {
      method: 'GET',
      params: { ...params, format },
      headers: {
        'Accept': format === 'csv' ? 'text/csv' : 
                format === 'excel' ? 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' :
                'application/json',
      },
    });

    return new Blob([response], {
      type: format === 'csv' ? 'text/csv' : 
           format === 'excel' ? 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' :
           'application/json',
    });
  }

  /**
   * Get Forecast Accuracy Metrics
   */
  async getForecastAccuracy(
    tenantId: string,
    params?: {
      product_name?: string;
      model_id?: string;
      start_date?: string;
      end_date?: string;
    }
  ): Promise<{
    overall_accuracy: number;
    product_accuracy: Array<{
      product_name: string;
      accuracy: number;
      sample_size: number;
    }>;
  }> {
    return apiClient.get(`/tenants/${tenantId}/forecasts/accuracy`, { params });
  }
}

export const forecastingService = new ForecastingService();