import * as React from "react";

import { ActionExecutorContext } from "@applicaster/zapp-react-native-utils/actionsExecutor/ActionExecutorContext";
import {
  buildEntryActions,
  EntryActionDeps,
} from "@applicaster/zapp-react-native-utils/entryActions";
import { useRoute } from "@applicaster/zapp-react-native-utils/reactHooks/navigation";
import { useScreenStateStore } from "@applicaster/zapp-react-native-utils/reactHooks/navigation/useScreenStateStore";
import {
  useCurrentScreenData,
  useScreenContext,
} from "@applicaster/zapp-react-native-utils/reactHooks/screen";
import { RegisteredAction } from "@applicaster/zapp-react-native-utils/uiActionsRegistrator";

/**
 * Expands `entry.extensions.entry_action` into invokable actions, against the
 * screen this hook is called from.
 *
 * Entry actions are data on the entry, not an installed capability, so there is
 * nothing to look up by identifier: the surface showing the entry expands them.
 * That also decides which screen they execute against — the one whose tree this
 * hook runs in, rather than whichever screen happened to be current when a
 * global provider was registered.
 *
 * Pass the result to `resolveActionIdentifiers` / `resolvePlayerActions` as
 * `expandEntryActions`.
 */
export function useEntryActionsExpander(): (
  entry: ZappEntry | ZappFeed
) => RegisteredAction[] {
  const { pathname } = useRoute();

  const screenContext = useScreenContext();
  const screenData = useCurrentScreenData();
  const screenState = screenContext?.options;
  const screenStateStore = useScreenStateStore();
  const actionExecutor = React.useContext(ActionExecutorContext);

  // Read through a ref so the returned expander keeps a stable identity: it
  // feeds `useMemo` dependency lists on surfaces that re-resolve their actions
  // on every registry change.
  const depsRef = React.useRef<EntryActionDeps>();

  depsRef.current = {
    actionExecutor,
    actionContext: {
      screenData,
      screenState,
      screenRoute: pathname,
      screenStateStore,
      // From the screen context, the way `useCellClick` builds the same bag.
      // The ZappPipes entry context is a route-keyed map, so reading `.data`
      // off it was always undefined.
      screenEntry: screenContext?.entry,
    },
  };

  return React.useCallback(
    (entry: ZappEntry | ZappFeed) => buildEntryActions(entry, depsRef.current),
    []
  );
}