"use client";

import {
  EditorCommand,
  EditorCommandEmpty,
  EditorCommandItem,
  EditorCommandList,
  EditorContent,
  type EditorInstance,
  EditorRoot,
  ImageResizer,
  type JSONContent,
  handleCommandNavigation,
  handleImageDrop,
  handleImagePaste,
} from "novel";
import { useEffect, useState } from "react";
import { useDebouncedCallback } from "use-debounce";
import { defaultExtensions } from "./extensions";
import { ColorSelector } from "./selectors/color-selector";
import { LinkSelector } from "./selectors/link-selector";
import { MathSelector } from "./selectors/math-selector";
import { NodeSelector } from "./selectors/node-selector";
import { Separator } from "../ui/separator";

import GenerativeMenuSwitch from "./generative/generative-menu-switch";
import { uploadFn } from "./image-upload";
import { TextButtons } from "./selectors/text-buttons";
import { slashCommand, suggestionItems } from "./slash-command";
import { defaultEditorContent } from "./content";

import "~/styles/prosemirror.css";

const hljs = require("highlight.js");

const extensions = [...defaultExtensions, slashCommand];

const ReportEditor = () => {
  const [initialContent, setInitialContent] = useState<null | JSONContent>(
    null,
  );
  const [saveStatus, setSaveStatus] = useState("Saved");
  const [charsCount, setCharsCount] = useState();

  const [openNode, setOpenNode] = useState(false);
  const [openColor, setOpenColor] = useState(false);
  const [openLink, setOpenLink] = useState(false);
  const [openAI, setOpenAI] = useState(false);

  //Apply Codeblock Highlighting on the HTML from editor.getHTML()
  const highlightCodeblocks = (content: string) => {
    const doc = new DOMParser().parseFromString(content, "text/html");
    doc.querySelectorAll("pre code").forEach((el) => {
      // @ts-ignore
      // https://highlightjs.readthedocs.io/en/latest/api.html?highlight=highlightElement#highlightelement
      hljs.highlightElement(el);
    });
    return new XMLSerializer().serializeToString(doc);
  };

  const debouncedUpdates = useDebouncedCallback(
    async (editor: EditorInstance) => {
      const json = editor.getJSON();
      setCharsCount(editor.storage.characterCount.words());
      window.localStorage.setItem(
        "html-content",
        highlightCodeblocks(editor.getHTML()),
      );
      window.localStorage.setItem("novel-content", JSON.stringify(json));
      window.localStorage.setItem(
        "markdown",
        editor.storage.markdown.getMarkdown(),
      );
      setSaveStatus("Saved");
    },
    500,
  );

  useEffect(() => {
    const content = window.localStorage.getItem("novel-content");
    if (content) setInitialContent(JSON.parse(content));
    else setInitialContent(defaultEditorContent);
  }, []);

  if (!initialContent) return null;

  return (
    <div className="relative w-full">
      <div className="absolute top-5 right-5 z-10 mb-5 flex gap-2">
        <div className="bg-accent text-muted-foreground rounded-lg px-2 py-1 text-sm">
          {saveStatus}
        </div>
        <div
          className={
            charsCount
              ? "bg-accent text-muted-foreground rounded-lg px-2 py-1 text-sm"
              : "hidden"
          }
        >
          {charsCount} Words
        </div>
      </div>
      <EditorRoot>
        <EditorContent
          immediatelyRender={false}
          initialContent={initialContent}
          extensions={extensions}
          className="border-muted bg-background relative h-full w-full overflow-auto sm:mb-[calc(20vh)] sm:border sm:shadow-lg"
          editorProps={{
            handleDOMEvents: {
              keydown: (_view, event) => handleCommandNavigation(event),
            },
            handlePaste: (view, event) =>
              handleImagePaste(view, event, uploadFn),
            handleDrop: (view, event, _slice, moved) =>
              handleImageDrop(view, event, moved, uploadFn),
            attributes: {
              class:
                "prose prose-base prose-p:my-4 dark:prose-invert prose-headings:font-title font-default focus:outline-none max-w-full",
            },
          }}
          onUpdate={({ editor }) => {
            debouncedUpdates(editor);
            setSaveStatus("Unsaved");
          }}
          slotAfter={<ImageResizer />}
        >
          <EditorCommand className="border-muted bg-background z-50 h-auto max-h-[330px] overflow-y-auto rounded-md border px-1 py-2 shadow-md transition-all">
            <EditorCommandEmpty className="text-muted-foreground px-2">
              No results
            </EditorCommandEmpty>
            <EditorCommandList>
              {suggestionItems.map((item) => (
                <EditorCommandItem
                  value={item.title}
                  onCommand={(val) => item.command?.(val)}
                  className="hover:bg-accent aria-selected:bg-accent flex w-full items-center space-x-2 rounded-md px-2 py-1 text-left text-sm"
                  key={item.title}
                >
                  <div className="border-muted bg-background flex h-10 w-10 items-center justify-center rounded-md border">
                    {item.icon}
                  </div>
                  <div>
                    <p className="font-medium">{item.title}</p>
                    <p className="text-muted-foreground text-xs">
                      {item.description}
                    </p>
                  </div>
                </EditorCommandItem>
              ))}
            </EditorCommandList>
          </EditorCommand>

          <GenerativeMenuSwitch open={openAI} onOpenChange={setOpenAI}>
            <Separator orientation="vertical" />
            <NodeSelector open={openNode} onOpenChange={setOpenNode} />
            <Separator orientation="vertical" />

            <LinkSelector open={openLink} onOpenChange={setOpenLink} />
            <Separator orientation="vertical" />
            <MathSelector />
            <Separator orientation="vertical" />
            <TextButtons />
            <Separator orientation="vertical" />
            <ColorSelector open={openColor} onOpenChange={setOpenColor} />
          </GenerativeMenuSwitch>
        </EditorContent>
      </EditorRoot>
    </div>
  );
};

export default ReportEditor;