import type { IDirectoryContextWriter } from "@metis/resources/services";
import type { UniqueID } from "@repo/rdx-ddd";
import { Maybe, Result } from "@repo/rdx-utils";

import type { AccessDefinition } from "../domain/access/access-definition";
import { AccessError } from "../domain/access/access-error";
import type { AuditContext } from "../domain/access/access-item.entity";
import { AccessItem } from "../domain/access/access-item.entity";
import { AccessValues } from "../domain/access/access-values.vo";
import type { AccessContext, AccessWorkspace } from "../domain/access/access-workspace.aggregate";

import type { AccessSnapshot } from "./access.repository";

export type DirectoryContextSnapshot = AccessSnapshot & {
  directorySystems: readonly string[];
  directoryEnvironments: readonly string[];
};

function createContextItem(
  workspace: AccessWorkspace,
  context: AccessContext,
  companyId: UniqueID,
  audit: AuditContext,
  data: Extract<AccessDefinition, { kind: "system" | "environment" }>
) {
  const values = AccessValues.create(data);

  if (!values.isSuccess) {
    return values;
  }
  const item = AccessItem.create(Maybe.some(companyId), values.data, audit);
  const changed = workspace.save(item, context);

  return changed.isSuccess ? Result.ok({ workspace: changed.data, item }) : changed;
}

/** Preparación pura: un contexto nuevo es dedicado; uno existente nunca se sustituye ni se mueve. */
export function planDirectoryContext(
  snapshot: DirectoryContextSnapshot,
  input: Parameters<IDirectoryContextWriter["ensure"]>[0]
) {
  if (!snapshot.workspace.companyId.getOrUndefined()?.equals(input.companyId)) {
    return Result.fail(new AccessError("SCOPE_MISMATCH"));
  }
  let workspace = snapshot.workspace;
  const audit = { actorId: input.actorId, recordedAt: input.recordedAt };
  const systemId = snapshot.directorySystems[0];
  let system = systemId
    ? workspace.items.find((item) => item.id.toPrimitive() === systemId)
    : undefined;

  if (systemId && !system) {
    return Result.fail(new AccessError("SCOPE_MISMATCH"));
  }
  if (!system) {
    const created = createContextItem(workspace, snapshot.context, input.companyId, audit, {
      kind: "system",
      name: "Active Directory",
      active: true,
    });

    if (!created.isSuccess) {
      return created;
    }
    workspace = created.data.workspace;
    system = created.data.item;
  }
  if (system.values.data.kind !== "system" || !system.values.data.active) {
    return Result.fail(new AccessError("INACTIVE_TARGET"));
  }

  return planEnvironment(workspace, snapshot, input, system.id.toPrimitive(), audit);
}

function planEnvironment(
  workspace: AccessWorkspace,
  snapshot: DirectoryContextSnapshot,
  input: Parameters<IDirectoryContextWriter["ensure"]>[0],
  systemId: string,
  audit: AuditContext
) {
  const environmentId = input.environmentId;

  if (environmentId) {
    const environment = workspace.items.find((item) => item.id.toPrimitive() === environmentId);

    if (
      !snapshot.directoryEnvironments.includes(environmentId) ||
      environment?.values.data.kind !== "environment" ||
      environment.values.data.systemId !== systemId ||
      !environment.values.data.active
    ) {
      return Result.fail(new AccessError("SCOPE_MISMATCH"));
    }

    return Result.ok({ workspace, environmentId, systemId });
  }
  const created = createContextItem(workspace, snapshot.context, input.companyId, audit, {
    kind: "environment",
    name: input.dnsName,
    systemId,
    active: true,
  });

  return created.isSuccess
    ? Result.ok({
        workspace: created.data.workspace,
        environmentId: created.data.item.id.toPrimitive(),
        systemId,
      })
    : created;
}