export interface User {
  id: number;
  username: string;
  password: string;
  name: string;
  email: string | null;
  role: 'admin' | 'user';
  created_at: string;
  updated_at: string;
}

export interface Company {
  id: number;
  company_name: string;
  is_active: boolean;
  created_at: string;
  updated_at: string;
}

export interface Serial {
  id: number;
  serial_number: string;
  company_name: string;
  valid_until: string | null;
  is_active: boolean;
  created_by: number | null;
  created_at: string;
  updated_at: string;
  created_by_name?: string;
}

export interface AuthUser {
  id: number;
  username: string;
  name: string;
  role: 'admin' | 'user';
}

export interface JWTPayload {
  userId: number;
  username: string;
  role: 'admin' | 'user';
}

export interface LoginRequest {
  username: string;
  password: string;
}

export interface ChangePasswordRequest {
  currentPassword: string;
  newPassword: string;
}

export interface GenerateSerialRequest {
  companyName: string;
  quantity?: number;
  validDays?: number;
}

export interface GenerateSerialWithPrefixRequest {
  companyName: string;
  quantity?: number;
  validDays?: number;
  serialPrefix: string;
}

export interface QRCodeRequest {
  baseUrl?: string;
}

export interface UpdateSerialRequest {
  companyName?: string;
  validUntil?: string;
  isActive?: boolean;
}

export interface UpdateCompanyRequest {
  newCompanyName: string;
}

export interface PaginationQuery {
  page?: number;
  limit?: number;
  search?: string;
}

export interface PaginationResponse {
  page: number;
  limit: number;
  total: number;
  totalPages: number;
}

export interface ApiResponse<T = any> {
  message: string;
  data?: T;
  error?: string;
}

export interface LoginResponse {
  accessToken: string;
  user: {
    id: number;
    username: string;
    name: string;
    email: string | null;
    role: 'admin' | 'user';
  };
}

export interface SerialListItem {
  serialNumber: string;
  companyName: string;
  validUntil: string | null;
  isActive: boolean;
  createdAt: string;
  createdBy?: string;
}

export interface CompanyListItem {
  companyName: string;
  firstCreated: string;
  lastCreated: string;
  serialCount: number;
  activeCount: number;
  status: 'active' | 'disabled';
}

export interface CompanyDetail {
  companyName: string;
  serialCount: number;
  activeCount: number;
  disabledCount: number;
  expiredCount: number;
  firstCreated: string;
  lastCreated: string;
  status: 'active' | 'disabled';
  serials: SerialListItem[];
  monthlyStats: MonthlyStat[];
}

export interface MonthlyStat {
  month: string;
  count: number;
}

export interface StatsOverview {
  totalCompanies: number;
  totalSerials: number;
  activeSerials: number;
  inactiveSerials: number;
}

export interface StatsResponse {
  overview: StatsOverview;
  monthlyStats: Array<{ month: string; company_count: number; serial_count: number }>;
  recentCompanies: Array<{ companyName: string; lastCreated: string; status: 'active' | 'disabled' }>;
  recentSerials: Array<{ serialNumber: string; companyName: string; isActive: boolean; createdAt: string }>;
}