import apiClient from './api/client'

export interface OverviewStats {
  users?: {
    total: number
    active: number
    inactive: number
  }
  invoices?: {
    total: number
  }
  revenue?: {
    total: number
  }
  storage?: {
    totalSize: number
    documents: number
  }
  totalUsers: number
  activeUsers: number
  totalRevenue: number
  totalTransactions: number
  storageUsed: number
  storageLimit: number
}

export interface UserGrowthData {
  date: string
  users: number
  activeUsers: number
}

export interface RevenueData {
  date: string
  revenue: number
  transactions: number
}

class AnalyticsService {
  /**
   * Get overview statistics
   */
  async getOverview(): Promise<OverviewStats> {
    const response = await apiClient.get<OverviewStats>('/admin/analytics/overview')
    return response.data
  }

  /**
   * Get user growth data
   */
  async getUserGrowth(days: number = 30): Promise<UserGrowthData[]> {
    const response = await apiClient.get<UserGrowthData[]>('/admin/analytics/users/growth', {
      params: { days },
    })
    return response.data
  }

  /**
   * Get revenue data
   */
  async getRevenue(period: '7days' | '30days' | '90days' = '30days'): Promise<RevenueData[]> {
    const response = await apiClient.get<RevenueData[]>('/admin/analytics/revenue', {
      params: { period },
    })
    return response.data
  }

  /**
   * Get API usage statistics
   */
  async getApiUsage(days: number = 7): Promise<any> {
    const response = await apiClient.get('/admin/analytics/api-usage', {
      params: { days },
    })
    return response.data
  }

  /**
   * Get error rate statistics
   */
  async getErrorRate(days: number = 7): Promise<any> {
    const response = await apiClient.get('/admin/analytics/error-rate', {
      params: { days },
    })
    return response.data
  }

  /**
   * Get storage usage by user
   */
  async getStorageByUser(limit: number = 10): Promise<any> {
    const response = await apiClient.get('/admin/analytics/storage/by-user', {
      params: { limit },
    })
    return response.data
  }

  /**
   * Get storage analytics
   */
  async getStorageAnalytics(): Promise<any> {
    const response = await apiClient.get('/admin/analytics/storage')
    return response.data
  }

  /**
   * Export analytics data
   */
  async exportData(): Promise<Blob> {
    const response = await apiClient.get('/admin/analytics/export', {
      responseType: 'blob',
    })
    return response.data
  }
}

export const analyticsService = new AnalyticsService()