import { apiClient } from '../../services/apiClient';

export interface AssessmentStats {
  totalAttempts: number;
  highestScore: number;
  averageScore: number;
  completionRate: number;
  recentRecords: {
    id: string;
    userId?: string;
    knowledgeBase: string;
    template: string;
    score: number | null;
    status: 'IN_PROGRESS' | 'COMPLETED';
    createdAt: string;
    user?: { id: string };
  }[];
}

export interface StatsQueryParams {
  startDate?: string;
  endDate?: string;
  templateId?: string;
  knowledgeGroupId?: string;
}

export class AssessmentStatsService {
  async getStats(params?: StatsQueryParams): Promise<AssessmentStats> {
    const query = new URLSearchParams();
    if (params?.startDate) query.set('startDate', params.startDate);
    if (params?.endDate) query.set('endDate', params.endDate);
    if (params?.templateId) query.set('templateId', params.templateId);
    if (params?.knowledgeGroupId) query.set('knowledgeGroupId', params.knowledgeGroupId);

    const queryString = query.toString();
    const url = `/assessment/stats${queryString ? `?${queryString}` : ''}`;
    const { data } = await apiClient.get<AssessmentStats>(url);
    return data;
  }

  async reviewAssessment(sessionId: string, newScore: number, comment?: string): Promise<any> {
    const response = await apiClient.request(`/assessment/${sessionId}/review`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ newScore, comment }),
    });
    if (!response.ok) throw new Error('Failed to review assessment');
    return await response.json();
  }
}

export const assessmentStatsService = new AssessmentStatsService();