import { Injectable, inject } from '@angular/core';
import { firstValueFrom } from 'rxjs';
import { ApiService } from './api.service';
import type { AuditLog, AuditLogFilters, AuditAction, AuditCategory } from '@library/shared-types';

interface AuditLogResponse {
  logs: AuditLog[];
  total: number;
  page: number;
  limit: number;
  totalPages: number;
}

@Injectable({
  providedIn: 'root',
})
export class AuditLogService {
  private api = inject(ApiService);

  async getLogs(filters: AuditLogFilters = {}): Promise<AuditLogResponse> {
    const params = new URLSearchParams();

    if (filters.action) params.set('action', filters.action);
    if (filters.category) params.set('category', filters.category);
    if (filters.userId) params.set('userId', filters.userId);
    if (filters.success !== undefined) params.set('success', String(filters.success));
    if (filters.startDate) params.set('startDate', filters.startDate.toISOString());
    if (filters.endDate) params.set('endDate', filters.endDate.toISOString());
    if (filters.page) params.set('page', String(filters.page));
    if (filters.limit) params.set('limit', String(filters.limit));

    const queryString = params.toString();
    const url = queryString ? `/audit?${queryString}` : '/audit';

    return firstValueFrom(this.api.get<AuditLogResponse>(url));
  }

  async getSecurityLogs(page = 1, limit = 50): Promise<AuditLogResponse> {
    return firstValueFrom(this.api.get<AuditLogResponse>(`/audit/security?page=${page}&limit=${limit}`));
  }

  async getUserLogs(userId: string, page = 1, limit = 50): Promise<AuditLogResponse> {
    return firstValueFrom(this.api.get<AuditLogResponse>(`/audit/user/${userId}?page=${page}&limit=${limit}`));
  }

  getActionLabel(action: AuditAction): string {
    const labels: Record<string, string> = {
      LOGIN: 'Login',
      LOGOUT: 'Logout',
      LOGIN_FAILED: 'Login Failed',
      COMMENT_CREATE: 'Comment Created',
      COMMENT_DELETE: 'Comment Deleted',
      ENTRY_CREATE: 'Entry Created',
      ENTRY_UPDATE: 'Entry Updated',
      ENTRY_DELETE: 'Entry Deleted',
      USER_BAN: 'User Banned',
      USER_UNBAN: 'User Unbanned',
      RATE_LIMIT_EXCEEDED: 'Rate Limit Exceeded',
      CSRF_VALIDATION_FAILED: 'CSRF Validation Failed',
      UNAUTHORIZED_ACCESS: 'Unauthorized Access',
    };
    return labels[action] ?? action;
  }

  getCategoryLabel(category: AuditCategory): string {
    const labels: Record<string, string> = {
      AUTH: 'Authentication',
      CONTENT: 'Content',
      ADMIN: 'Administration',
      SECURITY: 'Security',
    };
    return labels[category] ?? category;
  }

  getCategoryColor(category: AuditCategory): string {
    const colors: Record<string, string> = {
      AUTH: '#3b82f6',      // blue
      CONTENT: '#10b981',   // green
      ADMIN: '#8b5cf6',     // purple
      SECURITY: '#ef4444',  // red
    };
    return colors[category] ?? '#6b7280';
  }
}