import { createContext, useContext } from "react";
import { coerceTagModes, coerceUntagged, type FeedFilters, type SavedView } from "../lib/api";

// The saved-views context + hook (and the feed blob coercion its consumers share), split out of
// SavedViewsProvider so that file exports only components (Fast Refresh).

// A saved view's `filters` is an opaque JSON blob from the DB; coerce it to the module's shape before it
// reaches app state or a serializer (an older build's dropped field just falls away — NOT a migration).
export const asFilters = (raw: FeedFilters): FeedFilters => ({
  ...raw,
  tags: raw.tags ?? [],
  channelIds: raw.channelIds ?? [],
  tagModes: coerceTagModes(raw),
  untagged: coerceUntagged(raw),
});

export type ViewSource = "feed" | "plex";

export interface SavedViewsContext {
  /** Which module these views belong to — the shared UI branches its filter-describer on it. */
  source: ViewSource;
  views: SavedView[];
  loading: boolean;
  activeViewId: number | null;
  displayView: SavedView | null;
  isDirty: boolean;
  modalOpen: boolean;
  openModal: () => void;
  closeModal: () => void;
  apply: (v: SavedView) => void;
  clearActive: () => void;
  create: (name: string) => Promise<boolean>;
  rename: (id: number, name: string) => Promise<boolean>;
  /** Overwrite a view's captured filters (used by the modal's removable chips). */
  updateFilters: (id: number, filters: Record<string, unknown>) => Promise<boolean>;
  /** Save the module's CURRENTLY-applied filters into a view (the live→stored inverse of `apply`);
   *  resolves to the saved snapshot on success (so the caller can resync its editor) or null. */
  saveCurrent: (id: number) => Promise<Record<string, unknown> | null>;
  toggleDefault: (v: SavedView) => Promise<void>;
  remove: (v: SavedView) => Promise<boolean>;
  reorder: (nextIds: number[]) => Promise<void>;
}

export const SavedViewsCtx = createContext<SavedViewsContext | null>(null);

export function useSavedViews(): SavedViewsContext {
  const ctx = useContext(SavedViewsCtx);
  if (!ctx) throw new Error("useSavedViews must be used within a SavedViewsProvider");
  return ctx;
}