// ---------------------------------------------------------------------------
// Extension factory
//
// Generates TipTap Node extensions from ComponentDef declarations.
// A single factory handles both "wrapper" (editable children) and
// "atomic" (self-closing) components based on def.kind.
// ---------------------------------------------------------------------------

import { Node, mergeAttributes } from "@tiptap/core";
import { ReactNodeViewRenderer } from "@tiptap/react";
import type { ComponentDef } from "./registry";
import { makeWrapperView } from "./WrapperView";
import { makeAtomicView } from "./AtomicView";
import { MermaidNodeView } from "./MermaidView";
import { HfUserNodeView } from "./HfUserView";
import { makeHtmlEmbedView } from "../embeds/HtmlEmbedView";
import { makeIframeEmbedView } from "../embeds/IframeEmbedView";

function buildAttrSchema(fields: ComponentDef["fields"]) {
  const attrs: Record<string, { default: unknown }> = {};
  for (const f of fields) {
    attrs[f.name] = { default: f.default ?? null };
  }
  return attrs;
}

function buildDefaultAttrs(fields: ComponentDef["fields"]) {
  const attrs: Record<string, unknown> = {};
  for (const f of fields) {
    attrs[f.name] = f.default ?? null;
  }
  return attrs;
}

/**
 * Build a TipTap Node extension for any component definition.
 *
 * - "wrapper" components have editable ProseMirror content (block+).
 * - "atomic" components are self-closing atoms with no inner editing.
 */
export function createComponentExtension(def: ComponentDef) {
  const isWrapper = def.kind === "wrapper";
  const commandName = `insert${def.tag}`;

  return Node.create({
    name: def.name,
    group: "block",
    ...(isWrapper
      ? { content: def.content || "block+", defining: true, isolating: true }
      : { atom: true, draggable: true, selectable: true }),

    addAttributes() {
      return buildAttrSchema(def.fields);
    },

    parseHTML() {
      return [{ tag: `div[data-component="${def.name}"]` }];
    },

    renderHTML({ HTMLAttributes }) {
      const base = mergeAttributes(HTMLAttributes, { "data-component": def.name });
      return isWrapper ? ["div", base, 0] : ["div", base];
    },

    addCommands() {
      return {
        [commandName]:
          () =>
          ({ commands }: { commands: any }) => {
            const content: any = { type: def.name, attrs: buildDefaultAttrs(def.fields) };
            if (isWrapper) content.content = [{ type: "paragraph" }];
            return commands.insertContent(content);
          },
      } as any;
    },

    addNodeView() {
      if (isWrapper) {
        return ReactNodeViewRenderer(makeWrapperView(def));
      }
      let View;
      if (def.name === "mermaid") View = MermaidNodeView;
      else if (def.name === "hfUser") View = HfUserNodeView;
      else if (def.name === "htmlEmbed") View = makeHtmlEmbedView(def);
      else if (def.name === "iframe") View = makeIframeEmbedView(def);
      else View = makeAtomicView(def);
      return ReactNodeViewRenderer(View);
    },
  });
}

/** @deprecated Use createComponentExtension instead */
export const createWrapperExtension = createComponentExtension;
/** @deprecated Use createComponentExtension instead */
export const createAtomicExtension = createComponentExtension;