import { Decimal } from 'decimal.js';
import type { Module } from './module.js';

export interface BlocProps {
  id: number;
  formationId: number;
  nom: string;
  heuresPrevues: Decimal;
  ordre?: number;
  modules?: Module[];
}

const ZERO = new Decimal(0);

export class Bloc {
  public readonly id: number;
  public readonly formationId: number;
  public nom: string;
  public heuresPrevues: Decimal;
  public ordre: number;
  public readonly modules: Module[];

  constructor(props: BlocProps) {
    if (props.heuresPrevues.lt(0)) {
      throw new Error('heuresPrevues doit etre >= 0');
    }
    this.id = props.id;
    this.formationId = props.formationId;
    this.nom = props.nom;
    this.heuresPrevues = props.heuresPrevues;
    this.ordre = props.ordre ?? 0;
    this.modules = props.modules ?? [];
  }

  heuresAttribuees(): Decimal {
    return this.modules.reduce((acc, m) => acc.plus(m.heuresPrevues), ZERO);
  }

  heuresRestantes(): Decimal {
    return this.heuresPrevues.minus(this.heuresAttribuees());
  }

  ajouterModule(module: Module): void {
    if (this.modules.some((m) => m.id === module.id)) {
      throw new Error(`Module ${module.id} deja present dans le bloc`);
    }
    const total = this.heuresAttribuees().plus(module.heuresPrevues);
    if (total.gt(this.heuresPrevues)) {
      throw new Error(
        `Capacite bloc depassee: ${total.toString()} > ${this.heuresPrevues.toString()}`,
      );
    }
    this.modules.push(module);
  }
}