import type { EnvironmentProject } from "@t3tools/client-runtime/state/shell";
import type { EnvironmentId } from "@t3tools/contracts";

import { scopedProjectKey } from "../../lib/scopedEntities";
import type { HomeProjectScope } from "../home/homeThreadList";

type DraftProjectSelectionResolution =
  | { readonly kind: "preserve" }
  | { readonly kind: "select"; readonly project: EnvironmentProject }
  | { readonly kind: "pick" };

export function getProjectScopeSelectionTarget(
  scope: HomeProjectScope,
  preferredEnvironmentId: EnvironmentId | null,
): EnvironmentProject {
  return (
    scope.projects.find((project) => project.environmentId === preferredEnvironmentId) ??
    scope.representative
  );
}

export function getOnlySelectableProject(
  projectScopes: ReadonlyArray<HomeProjectScope>,
): EnvironmentProject | null {
  const onlyScope = projectScopes.length === 1 ? projectScopes[0] : null;
  return onlyScope?.representative ?? null;
}

export function resolveDraftProjectSelection(
  selectedProjectKey: string | null,
  projects: ReadonlyArray<EnvironmentProject>,
  projectScopes: ReadonlyArray<HomeProjectScope>,
): DraftProjectSelectionResolution {
  const hasExplicitProjectSelection =
    selectedProjectKey !== null &&
    projects.some(
      (project) => scopedProjectKey(project.environmentId, project.id) === selectedProjectKey,
    );
  if (hasExplicitProjectSelection) {
    return { kind: "preserve" };
  }

  const onlyProject = getOnlySelectableProject(projectScopes);
  return onlyProject ? { kind: "select", project: onlyProject } : { kind: "pick" };
}