import type { AccessDefinition } from "../domain/access/access-definition";

import type { ProcessReviewSources } from "./process-review.builder";

type Item = { id: string; values: AccessDefinition };

type Relationship = ProcessReviewSources["relationships"][number];

function memberships(
  link: Extract<AccessDefinition, { kind: "account_person" }>,
  login: string,
  items: readonly Item[]
): Relationship[] {
  return items.flatMap((item) => {
    const m = item.values;

    if (m.kind !== "membership" || m.accountId !== link.accountId) {
      return [];
    }
    const group = items.find((i) => i.id === m.groupId)?.values;

    if (group?.kind !== "group") {
      throw new Error("Grupo de revisión inconsistente.");
    }
    const ends = [link.endDate, m.endDate].filter((date): date is string => Boolean(date)).sort();

    return [
      {
        id: item.id,
        kind: "membership",
        personId: link.personId,
        label: `${login} · ${group.name}`,
        endDate: ends[0] ?? null,
        configuration: m.configuration,
      },
    ];
  });
}

export function accessReviewRelationships(items: readonly Item[]): Relationship[] {
  return items.flatMap((item) => {
    const v = item.values;

    if (v.kind === "account_person") {
      const account = items.find((i) => i.id === v.accountId)?.values;

      if (account?.kind !== "account") {
        throw new Error("Cuenta de revisión inconsistente.");
      }

      return [
        {
          id: item.id,
          kind: "account",
          personId: v.personId,
          label: account.login,
          endDate: v.endDate,
          configuration: v.configuration,
        },
        ...memberships(v, account.login, items),
      ];
    }
    if (v.kind === "need") {
      const resource = items.find((i) => i.id === v.resourceId)?.values;

      if (resource?.kind !== "resource") {
        throw new Error("Recurso de revisión inconsistente.");
      }

      return [
        {
          id: item.id,
          kind: "need",
          personId: v.personId,
          label: resource.name,
          endDate: v.endDate,
          configuration: null,
        },
      ];
    }

    return [];
  });
}