import { TipoDocumentoFiscal } from '../value-objects/FiscalEnums.js';
import { ResolucionAgotadaException } from '../exceptions/ValidacionFiscalException.js';

export interface ResolucionDianProps {
  id?: string;
  tenantId?: string;
  resolutionNumber: string;
  prefix: string;
  fromNumber: bigint;
  toNumber: bigint;
  currentConsecutive: bigint;
  technicalKey: string;
  startDate: Date;
  endDate: Date;
  isActive?: boolean;
  documentType?: TipoDocumentoFiscal;
}

export class ResolucionDian {
  public readonly id?: string;
  public readonly tenantId?: string;
  public readonly resolutionNumber: string;
  public readonly prefix: string;
  public readonly fromNumber: bigint;
  public readonly toNumber: bigint;
  private _currentConsecutive: bigint;
  public readonly technicalKey: string;
  public readonly startDate: Date;
  public readonly endDate: Date;
  public readonly isActive: boolean;
  public readonly documentType: TipoDocumentoFiscal;

  constructor(props: ResolucionDianProps) {
    this.id = props.id;
    this.tenantId = props.tenantId;
    this.resolutionNumber = props.resolutionNumber.trim();
    this.prefix = props.prefix.trim().toUpperCase();
    this.fromNumber = BigInt(props.fromNumber);
    this.toNumber = BigInt(props.toNumber);
    this._currentConsecutive = BigInt(props.currentConsecutive);
    this.technicalKey = props.technicalKey.trim();
    this.startDate = props.startDate;
    this.endDate = props.endDate;
    this.isActive = props.isActive ?? true;
    this.documentType = props.documentType || TipoDocumentoFiscal.FACTURA_VENTA;

    this.validarInvariantes();
  }

  private validarInvariantes(): void {
    if (this.fromNumber > this.toNumber) {
      throw new Error('El rango inicial no puede ser mayor que el rango final de la resolución.');
    }
  }

  public get currentConsecutive(): bigint {
    return this._currentConsecutive;
  }

  public estaVigente(fechaReferencia: Date = new Date()): boolean {
    if (!this.isActive) return false;
    return fechaReferencia >= this.startDate && fechaReferencia <= this.endDate;
  }

  public tieneNumerosDisponibles(): boolean {
    return this._currentConsecutive < this.toNumber;
  }

  public obtenerSiguienteConsecutivo(): bigint {
    if (!this.estaVigente()) {
      throw new ResolucionAgotadaException(
        `La resolución ${this.resolutionNumber} (Prefijo: ${this.prefix}) ha expirado o se encuentra inactiva.`
      );
    }

    if (!this.tieneNumerosDisponibles()) {
      throw new ResolucionAgotadaException(
        `Rango de numeración agotado para la resolución ${this.resolutionNumber} (Prefijo: ${this.prefix}). Rango límite: ${this.toNumber}`
      );
    }

    this._currentConsecutive += 1n;
    return this._currentConsecutive;
  }

  public formatearNumeroCompleto(consecutivo: bigint): string {
    return this.prefix ? `${this.prefix}-${consecutivo}` : `${consecutivo}`;
  }

  public porcentajeConsumido(): number {
    const total = Number(this.toNumber - this.fromNumber + 1n);
    if (total <= 0) return 100;
    const usados = Number(this._currentConsecutive - this.fromNumber + 1n);
    const porcentaje = Math.min(100, Math.max(0, (usados / total) * 100));
    return Math.round(porcentaje * 10) / 10;
  }

  public diasRestantesVigencia(ahora: Date = new Date()): number {
    const diffMs = this.endDate.getTime() - ahora.getTime();
    return Math.max(0, Math.ceil(diffMs / (1000 * 60 * 60 * 24)));
  }
}