import { differenceInDays } from "date-fns";
import { Period } from "../period/Period";
import { arePeriodsOverlaping } from "../period/arePeriodsOverlaping";
import { isPeriodContaining } from "../period/isPeriodContaining";
import { ContexteEntreeDC } from "./ContexteEntreeDC";
import { EvenementFamille } from "./EvenementFamille";
import { StatutFamille } from "./StatutFamille";

export type Famille = Readonly<{
  notionId: string;
  Titre: string;
  Statut: StatutFamille;
  Integration: Date | null;
  ContexteEntree: ContexteEntreeDC;
  Sortie: Date | null;
  // sorted by date asc
  Evenements: EvenementFamille[];
  DerniereModification: Date;
}>;

export function periodOfResistance(
  family: Famille,
  atDate: Date = new Date(Date.now())
): Period | null {
  if (family.Statut !== "Résistant.e" && family.Statut !== "Ex résistant·e·s") {
    return null;
  }
  if (!family.Integration || family.Integration > atDate) {
    return null;
  }
  return {
    start: family.Integration,
    end:
      family.Sortie !== null && family.Sortie < atDate ? family.Sortie : atDate,
  };
}

export function isResistant(
  family: Famille,
  date: Date = new Date(Date.now())
): boolean {
  const por = periodOfResistance(family, date);
  return por !== null && isPeriodContaining(por, date);
}

export function isIntegration(famille: Famille) {
  return (
    famille.Statut === "Se questionne" ||
    famille.Statut === "Déclaration validée - Attente éléments" ||
    famille.Statut === "Rédaction Déclaration" ||
    famille.Statut === "Désobéissance décidée" ||
    famille.Statut === "À préciser"
  );
}

export function isExResistant(
  family: Famille,
  date: Date = new Date(Date.now())
): boolean {
  const por = periodOfResistance(family, date);
  return por !== null && por.end < date;
}

export function isResistantOverPeriod(
  family: Famille,
  period: Period
): boolean {
  const familyPeriodResistant: Period | null = periodOfResistance(family);
  return (
    familyPeriodResistant !== null &&
    arePeriodsOverlaping(familyPeriodResistant, period)
  );
}

/**
 *
 * @param family
 * @param atDate
 * @returns the duration of resistance in days or null if family was not yet in resistances at this date
 */
export function dureeResistanceInDays(
  family: Famille,
  atDate: Date = new Date(Date.now())
): number | null {
  const period = periodOfResistance(family, atDate);
  if (period == null) {
    return null;
  }
  return differenceInDays(period.end, period.start);
}