import {
  PLATFORM_ROUTE_RUNTIME_CONTRACT,
  type RouteRuntimeDefinition,
} from "../contracts/route-runtime-contract.ts";
import {
  PLATFORM_ROUTE_REGISTRY,
  type RouteDefinition,
} from "../contracts/routes.ts";
import {
  composeSchemaRegistry,
  PLATFORM_SCHEMA_REGISTRY,
} from "../contracts/schema-registry.ts";
import {
  INSTALLED_PRODUCT_FEATURES,
} from "./installed-product-manifest.ts";
import {
  composeApiOperations,
  validateApiRuntimeBindings,
} from "../contracts/api-operations.ts";
import { validateRestProfileBindings } from "../contracts/rest-profiles.ts";
import { composeRuntimeSchemaCodecs } from "../contracts/schema-registry.ts";
import { composeBoundaryMapperRegistry } from "../contracts/boundary-mapper.ts";
import {
  TECH_LOG_ROUTE_REGISTRY,
  TECH_LOG_ROUTE_RUNTIME_CONTRACT,
  TECH_LOG_ROUTE_SCHEMA_REGISTRY,
} from "./tech-log/contracts/tech-log-route-contract.ts";

/**
 * §3.5. Composed from the product manifest rather than from a literal list, so
 * a feature the build did not select contributes no routes, no operations, no
 * schemas and no messages — and is therefore not reachable from any registry.
 */
export const INSTALLED_FEATURE_CONTRACTS = INSTALLED_PRODUCT_FEATURES;

/**
 * Template merge. Two intents meet here and both are kept.
 *
 * The template's manifest is retained above, so narrowing the selection still
 * withdraws a feature's operations, schemas, mappers and invalidation edges.
 *
 * The route registry is *not* composed from `contract.routes`, though. The
 * reference feature still declares `REFERENCE_RESOURCE_*` routes, but this
 * product deleted their screens during the UI migration, so reducing over those
 * routes would register paths with no component behind them — a deep link that
 * resolves to nothing. The registry therefore lists the platform routes (empty
 * on this branch) and TechLog's, which are the routes that actually exist.
 *
 * Re-adding the reference screens, or dropping the reference feature's route
 * declarations, is a product decision; a merge only has to avoid inventing a
 * third state where a route is registered and unmountable.
 */
export const ROUTE_REGISTRY = Object.freeze({
  ...PLATFORM_ROUTE_REGISTRY,
  ...TECH_LOG_ROUTE_REGISTRY,
}) satisfies Readonly<Record<string, RouteDefinition>>;
export const ROUTE_RUNTIME_CONTRACT = Object.freeze({
  ...PLATFORM_ROUTE_RUNTIME_CONTRACT,
  ...TECH_LOG_ROUTE_RUNTIME_CONTRACT,
}) satisfies Readonly<Record<string, RouteRuntimeDefinition>>;
export const API_OPERATIONS = composeApiOperations(
  INSTALLED_FEATURE_CONTRACTS.map((contract) => contract.apiOperations),
);
export const REST_PROFILE_BINDINGS_VALID = validateRestProfileBindings(
  API_OPERATIONS,
  Object.freeze({ PRIMARY_API: Object.freeze(["omit"] as const) }),
);
export const INVALIDATION_REGISTRY = Object.freeze({
  topics: Object.freeze(
    INSTALLED_FEATURE_CONTRACTS.flatMap(
      (contract) => contract.invalidation.topics,
    ),
  ),
  namespaces: Object.freeze(
    INSTALLED_FEATURE_CONTRACTS.flatMap(
      (contract) => contract.invalidation.namespaces,
    ),
  ),
  edges: Object.freeze(
    INSTALLED_FEATURE_CONTRACTS.flatMap(
      (contract) => contract.invalidation.edges,
    ),
  ),
});
export const INVALIDATION_TOPIC_VERSIONS = Object.freeze(
  INSTALLED_FEATURE_CONTRACTS.flatMap((contract) => contract.topicVersions),
);
export const SCHEMA_REGISTRY = composeSchemaRegistry([
  PLATFORM_SCHEMA_REGISTRY,
  TECH_LOG_ROUTE_SCHEMA_REGISTRY,
  ...INSTALLED_FEATURE_CONTRACTS.map((contract) => contract.schemas),
]);
export const RUNTIME_SCHEMA_CODECS = composeRuntimeSchemaCodecs(
  INSTALLED_FEATURE_CONTRACTS.map((contract) => contract.runtimeSchemas),
);
export const MAPPER_REGISTRY = composeBoundaryMapperRegistry(
  INSTALLED_FEATURE_CONTRACTS.map((contract) => contract.mappers),
);
export const API_RUNTIME_BINDINGS_VALID = validateApiRuntimeBindings(
  API_OPERATIONS,
  SCHEMA_REGISTRY,
  RUNTIME_SCHEMA_CODECS,
  MAPPER_REGISTRY,
);

/**
 * §3.5. Which feature owns each route.
 *
 * A route contributed by a feature disappears with it at build time, and has to
 * be withdrawn from navigation and from the router when the runtime document
 * disables that feature. Platform routes have no owner and are always present.
 */
export const ROUTE_FEATURE_OWNER: Readonly<Record<string, string>> =
  Object.freeze(
    Object.fromEntries(
      INSTALLED_FEATURE_CONTRACTS.flatMap((contract) =>
        Object.keys(contract.routes)
          // Template merge. Ownership describes routes this product actually
          // registered. The reference feature still declares screens this
          // product removed; attributing an unregistered route to a feature
          // would claim the kill switch governs something no router can mount.
          .filter((routeId) => routeId in ROUTE_REGISTRY)
          .map((routeId) => [routeId, contract.featureId] as const),
      ),
    ),
  );

export const NAVIGATION_ROUTES = Object.freeze(
  Object.values(ROUTE_REGISTRY)
    .filter(isNavigableRoute)
    .sort((left, right) => left.navigationOrder - right.navigationOrder),
);

type InstalledRouteDefinition =
  (typeof ROUTE_REGISTRY)[keyof typeof ROUTE_REGISTRY];
type NavigableRoute = InstalledRouteDefinition &
  Readonly<{ navigationOrder: number }>;

function isNavigableRoute(
  definition: InstalledRouteDefinition,
): definition is NavigableRoute {
  return definition.navigationOrder !== null;
}

export function getRoute(routeId: string): InstalledRouteDefinition {
  const registry: Readonly<Record<string, InstalledRouteDefinition>> =
    ROUTE_REGISTRY;
  const selected = registry[routeId];
  if (!selected) throw new Error(`Unregistered route: ${routeId}`);
  return selected;
}

export function routePath(routeId: string): string {
  return getRoute(routeId).path;
}