import { useApplicationFeature } from "../../../presentation/providers/application-provider.tsx";
import {
  useApplicationMutation,
  useApplicationQuery,
} from "../../../presentation/adapters/query/application-query.ts";
import { useRouteInput } from "../../../presentation/routes/route-input.tsx";
import {
  REFERENCE_FEATURE_ID,
  REFERENCE_RESOURCE_INVALIDATION_TOPIC,
  REFERENCE_RESOURCE_QUERY_NAMESPACE,
} from "../contracts/reference-feature-contract.ts";
import type {
  ReferenceCreateCommand,
  ReferenceFeatureInput,
  ReferenceListFilters,
} from "../application/reference-feature-api.ts";
import type { ReferenceResourceView } from "../contracts/reference-mapper.ts";
import {
  bindQuery,
  type BoundMutation,
  type QueryResultMeasure,
} from "../../../contracts/server-state.ts";
import { useServerStateScope } from "../../../presentation/adapters/query/server-state-scope-provider.tsx";

const UTF8 = new TextEncoder();

/**
 * §10.4. Feature-owned measurement over the mapped application value. There is
 * no generic fallback: bounded string bytes plus fixed primitive width plus a
 * small per-item overhead, never `JSON.stringify` or a recursive walker.
 */
function measureResourceView(view: ReferenceResourceView): QueryResultMeasure {
  return {
    itemCount: 1,
    estimatedBytes:
      UTF8.encode(view.resourceId).byteLength +
      UTF8.encode(view.title).byteLength +
      UTF8.encode(view.createdAt ?? "").byteLength +
      32,
  };
}

function measureResourceList(
  views: readonly ReferenceResourceView[],
): QueryResultMeasure {
  let estimatedBytes = 16;
  for (const view of views) {
    estimatedBytes += measureResourceView(view).estimatedBytes;
  }
  return { itemCount: views.length, estimatedBytes };
}

const REFERENCE_CREATE_MUTATION_POLICY = Object.freeze({
  definitionId: "reference-resource-create-v1",
  definitionVersion: 1,
  operationId: "CREATE_REFERENCE_RESOURCE",
  requiresIdempotencyKey: true,
  owner: REFERENCE_FEATURE_ID,
  duplicatePolicy: "REJECT_WHILE_ACTIVE" as const,
  invalidate: Object.freeze([REFERENCE_RESOURCE_INVALIDATION_TOPIC]),
});

type ReferenceCreateMutationBinding = Pick<
  BoundMutation<ReferenceCreateCommand, ReferenceResourceView>,
  "scope" | "execute"
>;

function bindReferenceCreateMutation(
  binding: ReferenceCreateMutationBinding,
): BoundMutation<ReferenceCreateCommand, ReferenceResourceView> {
  return Object.freeze({
    ...REFERENCE_CREATE_MUTATION_POLICY,
    ...binding,
  });
}

export function useReferenceFeatureInput(): ReferenceFeatureInput {
  return useApplicationFeature(REFERENCE_FEATURE_ID);
}

export function useReferenceDetail(resourceId: string) {
  const input = useReferenceFeatureInput();
  const scope = useServerStateScope();
  const query = useApplicationQuery(
    bindQuery(
      {
        definitionId: "reference-resource-detail-v1",
        definitionVersion: 1,
        owner: REFERENCE_FEATURE_ID,
        namespace: REFERENCE_RESOURCE_QUERY_NAMESPACE.namespaceId,
        namespaceVersion:
          REFERENCE_RESOURCE_QUERY_NAMESPACE.namespaceVersion,
        operationId: "GET_REFERENCE_RESOURCE",
        profileId: "DETAIL_STANDARD",
        measureResult: measureResourceView,
        execute: (selectedResourceId: string, { signal }) =>
          input.getResource(selectedResourceId, { signal }),
      },
      resourceId,
      scope,
    ),
  );
  return Object.freeze({ query });
}

export function useReferenceCreate() {
  const input = useReferenceFeatureInput();
  const scope = useServerStateScope();
  const mutation = bindReferenceCreateMutation({
    scope,
    execute: input.createResource,
  });
  return useApplicationMutation(mutation);
}

export function useReferenceFeature() {
  const input = useReferenceFeatureInput();
  const scope = useServerStateScope();
  const routeInput = useRouteInput();
  const filters = routeInput.search as ReferenceListFilters;
  const query = useApplicationQuery(
    bindQuery(
      {
        definitionId: "reference-resource-list-v1",
        definitionVersion: 1,
        owner: REFERENCE_FEATURE_ID,
        namespace: REFERENCE_RESOURCE_QUERY_NAMESPACE.namespaceId,
        namespaceVersion:
          REFERENCE_RESOURCE_QUERY_NAMESPACE.namespaceVersion,
        operationId: "LIST_REFERENCE_RESOURCES",
        profileId: "LIST_STANDARD",
        measureResult: measureResourceList,
        execute: (selectedFilters: ReferenceListFilters, { signal }) =>
          input.listResources(selectedFilters, { signal }),
      },
      filters,
      scope,
    ),
  );
  const mutation = useApplicationMutation(
    bindReferenceCreateMutation({
      scope,
      execute: input.createResource,
    }),
  );
  return Object.freeze({ filters, query, mutation });
}