"use client";

import * as React from "react";
import { useEditor, EditorContent, type Editor } from "@tiptap/react";
import { BubbleMenu } from "@tiptap/react/menus";
import StarterKit from "@tiptap/starter-kit";
import Placeholder from "@tiptap/extension-placeholder";
import Image from "@tiptap/extension-image";
import TaskList from "@tiptap/extension-task-list";
import TaskItem from "@tiptap/extension-task-item";
import Highlight from "@tiptap/extension-highlight";
import Typography from "@tiptap/extension-typography";
import TextAlign from "@tiptap/extension-text-align";
import HorizontalRule from "@tiptap/extension-horizontal-rule";
import CodeBlock from "@tiptap/extension-code-block";
import { Table, TableRow, TableCell, TableHeader } from "@tiptap/extension-table";
import { Collaboration } from "@tiptap/extension-collaboration";
import CollaborationCursor from "@tiptap/extension-collaboration-cursor";
import { WebSocketStatus } from "@hocuspocus/provider";
import {
  Bold,
  Italic,
  Underline as UnderlineIcon,
  Strikethrough,
  Code,
  Link2,
} from "lucide-react";

import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from "@/components/ui/tooltip";

import {
  useCollaboration,
  useAwarenessPeers,
  colorFromUserName,
  reconnectCollaboration,
  type CollaborationConnection,
} from "@/lib/yjs-provider";
import {
  PresenceAvatars,
  ConnectionStatus,
  type ConnectionUiStatus,
} from "@/components/ui/presence";

import { SlashCommand } from "./slash-menu";
import { EditorToolbar } from "./toolbar";
import { BlockDragHandle } from "./drag-handle";
import { Callout } from "./extensions/callout";
import { Toggle } from "./extensions/toggle";
import { Mention } from "./extensions/mention";
import { Embed } from "./extensions/embed";
import { Divider } from "./extensions/divider";
import { BlockEditor, type BlockEditorProps } from "./editor";

function bubbleCh(editor: Editor) {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  return editor.chain().focus() as any;
}

const editorContentStyles = cn(
  "editor-prose min-h-[280px] w-full max-w-none px-14 py-10 text-[15px] leading-7 text-foreground antialiased",
  "focus:outline-none [&_.ProseMirror]:outline-none [&_.ProseMirror]:min-h-[240px]",
  "[&_.ProseMirror_p.is-empty]:relative [&_.ProseMirror_p.is-empty::before]:pointer-events-none [&_.ProseMirror_p.is-empty::before]:float-left [&_.ProseMirror_p.is-empty::before]:h-0 [&_.ProseMirror_p.is-empty::before]:text-muted-foreground [&_.ProseMirror_p.is-empty::before]:content-[attr(data-placeholder)]",
  "[&_.ProseMirror_p]:my-1 [&_.ProseMirror_p]:leading-7",
  "[&_.ProseMirror_h1]:mb-3 [&_.ProseMirror_h1]:mt-8 [&_.ProseMirror_h1]:text-3xl [&_.ProseMirror_h1]:font-bold [&_.ProseMirror_h1]:tracking-tight [&_.ProseMirror_h1]:text-foreground",
  "[&_.ProseMirror_h2]:mb-2 [&_.ProseMirror_h2]:mt-6 [&_.ProseMirror_h2]:text-2xl [&_.ProseMirror_h2]:font-semibold [&_.ProseMirror_h2]:tracking-tight",
  "[&_.ProseMirror_h3]:mb-2 [&_.ProseMirror_h3]:mt-5 [&_.ProseMirror_h3]:text-xl [&_.ProseMirror_h3]:font-semibold",
  "[&_.ProseMirror_ul]:my-2 [&_.ProseMirror_ul]:list-disc [&_.ProseMirror_ul]:pl-6",
  "[&_.ProseMirror_ol]:my-2 [&_.ProseMirror_ol]:list-decimal [&_.ProseMirror_ol]:pl-6",
  "[&_.ProseMirror_li]:my-0.5 [&_.ProseMirror_li_p]:my-0",
  "[&_.ProseMirror_blockquote]:my-3 [&_.ProseMirror_blockquote]:border-l-4 [&_.ProseMirror_blockquote]:border-teal [&_.ProseMirror_blockquote]:bg-muted/40 [&_.ProseMirror_blockquote]:py-1 [&_.ProseMirror_blockquote]:pl-4 [&_.ProseMirror_blockquote]:pr-2 [&_.ProseMirror_blockquote]:italic [&_.ProseMirror_blockquote]:text-muted-foreground",
  "[&_.ProseMirror_pre]:my-4 [&_.ProseMirror_pre]:overflow-x-auto [&_.ProseMirror_pre]:rounded-lg [&_.ProseMirror_pre]:border [&_.ProseMirror_pre]:border-border [&_.ProseMirror_pre]:bg-muted/80 [&_.ProseMirror_pre]:p-4 [&_.ProseMirror_pre]:font-mono [&_.ProseMirror_pre]:text-sm",
  "[&_.ProseMirror_code]:rounded-md [&_.ProseMirror_code]:bg-muted [&_.ProseMirror_code]:px-1.5 [&_.ProseMirror_code]:py-0.5 [&_.ProseMirror_code]:font-mono [&_.ProseMirror_code]:text-[0.9em] [&_.ProseMirror_code]:text-foreground",
  "[&_.ProseMirror_pre_code]:bg-transparent [&_.ProseMirror_pre_code]:p-0",
  "[&_.ProseMirror_hr]:my-6 [&_.ProseMirror_hr]:border-border",
  "[&_.ProseMirror_img]:my-4 [&_.ProseMirror_img]:max-h-[480px] [&_.ProseMirror_img]:w-auto [&_.ProseMirror_img]:max-w-full [&_.ProseMirror_img]:rounded-lg [&_.ProseMirror_img]:border [&_.ProseMirror_img]:border-border",
  "[&_.ProseMirror_table]:my-4 [&_.ProseMirror_table]:w-full [&_.ProseMirror_table]:border-collapse [&_.ProseMirror_table]:overflow-hidden [&_.ProseMirror_table]:rounded-md [&_.ProseMirror_table]:border [&_.ProseMirror_table]:border-border",
  "[&_.ProseMirror_td]:border [&_.ProseMirror_td]:border-border [&_.ProseMirror_td]:bg-background [&_.ProseMirror_td]:px-3 [&_.ProseMirror_td]:py-2",
  "[&_.ProseMirror_th]:border [&_.ProseMirror_th]:border-border [&_.ProseMirror_th]:bg-muted [&_.ProseMirror_th]:px-3 [&_.ProseMirror_th]:py-2 [&_.ProseMirror_th]:text-left [&_.ProseMirror_th]:font-medium",
  "[&_.ProseMirror_.ProseMirror-selectednode]:ring-2 [&_.ProseMirror_.ProseMirror-selectednode]:ring-primary/40",
  "dark:[&_.ProseMirror_blockquote]:bg-muted/20",
);

function mapWsToUi(ws: WebSocketStatus): ConnectionUiStatus {
  if (ws === WebSocketStatus.Connected) return "connected";
  if (ws === WebSocketStatus.Connecting) return "connecting";
  return "disconnected";
}

export type CollaborativeBlockEditorProps = BlockEditorProps & {
  documentId: string;
  userName?: string;
  userColor?: string;
};

function CollaborativeEditorShell({
  collab,
  displayName,
  cursorColor,
  documentName,
  placeholder,
  onChange,
  editable,
  className,
}: {
  collab: CollaborationConnection & { doc: NonNullable<CollaborationConnection["doc"]>; provider: NonNullable<CollaborationConnection["provider"]> };
  displayName: string;
  cursorColor: string;
  documentName: string;
  placeholder?: string;
} & Pick<BlockEditorProps, "onChange" | "editable" | "className">) {
  const containerRef = React.useRef<HTMLDivElement>(null);
  const { doc, provider } = collab;

  const extensions = React.useMemo(
    () => [
      StarterKit.configure({
        undoRedo: false,
        heading: { levels: [1, 2, 3] },
        codeBlock: false,
        horizontalRule: false,
        link: {
          openOnClick: false,
          HTMLAttributes: {
            class:
              "text-primary underline underline-offset-2 decoration-primary/50",
          },
        },
      }),
      Collaboration.configure({
        document: doc,
        field: "default",
        provider,
      }),
      CollaborationCursor.configure({
        provider,
        user: {
          name: displayName,
          color: cursorColor,
        },
      }),
      Placeholder.configure({
        placeholder:
          placeholder ??
          'Write something, or type "/" for commands…',
      }),
      CodeBlock.configure({
        HTMLAttributes: {
          class: "font-mono text-sm",
        },
      }),
      HorizontalRule,
      Image.configure({
        HTMLAttributes: {
          class: "rounded-lg border border-border",
        },
      }),
      TaskList,
      TaskItem.configure({
        nested: true,
        HTMLAttributes: {
          class: "flex gap-2",
        },
      }),
      Highlight.configure({
        multicolor: true,
      }),
      Typography,
      TextAlign.configure({
        types: ["heading", "paragraph"],
      }),
      Table.configure({
        resizable: false,
      }),
      TableRow,
      TableHeader,
      TableCell,
      SlashCommand,
      Callout,
      Toggle,
      Mention,
      Embed,
      Divider,
    ],
    [cursorColor, displayName, doc, placeholder, provider],
  );

  const editor = useEditor(
    {
      immediatelyRender: false,
      extensions,
      // Yjs is the source of truth; avoid seeding HTML that could fight the fragment.
      content: "",
      editable: editable ?? true,
      editorProps: {
        attributes: {
          class: "focus:outline-none",
        },
      },
      onUpdate: ({ editor: ed }) => {
        onChange?.(ed.getHTML());
      },
    },
    [extensions, editable],
  );

  React.useEffect(() => {
    if (!editor) return;
    editor.commands.updateUser({
      name: displayName,
      color: cursorColor,
    });
  }, [cursorColor, displayName, editor]);

  React.useEffect(() => {
    if (!editor) return;
    editor.setEditable(editable ?? true);
  }, [editable, editor]);

  const localClientId = doc.clientID;
  const peers = useAwarenessPeers(collab.awareness, localClientId);

  const connectionLabel = mapWsToUi(collab.wsStatus);

  return (
    <TooltipProvider delayDuration={200}>
      <div
        className={cn(
          "group/editor overflow-hidden rounded-xl border border-border bg-card text-card-foreground shadow-sm",
          className,
        )}
      >
        <div className="flex flex-wrap items-center justify-between gap-3 border-b border-border/80 bg-muted/30 px-3 py-2">
          <div className="flex min-w-0 flex-1 flex-wrap items-center gap-3">
            <ConnectionStatus
              status={connectionLabel}
              onRetry={() => reconnectCollaboration(documentName)}
            />
            <PresenceAvatars users={peers} />
          </div>
        </div>
        <EditorToolbar editor={editor} />
        <div ref={containerRef} className="relative bg-background dark:bg-background">
          <BlockDragHandle editor={editor} containerRef={containerRef} />
          <EditorContent editor={editor} className={editorContentStyles} />
          {editor ? (
            <BubbleMenu
              editor={editor}
              options={{
                placement: "top",
              }}
              className="flex items-center gap-0.5 rounded-lg border border-border bg-popover p-1 shadow-lg"
            >
              <BubbleBtn
                label="Bold"
                shortcut="⌘B"
                active={editor.isActive("bold")}
                onClick={() => bubbleCh(editor).toggleBold().run()}
              >
                <Bold className="size-4" />
              </BubbleBtn>
              <BubbleBtn
                label="Italic"
                shortcut="⌘I"
                active={editor.isActive("italic")}
                onClick={() => bubbleCh(editor).toggleItalic().run()}
              >
                <Italic className="size-4" />
              </BubbleBtn>
              <BubbleBtn
                label="Underline"
                shortcut="⌘U"
                active={editor.isActive("underline")}
                onClick={() => bubbleCh(editor).toggleUnderline().run()}
              >
                <UnderlineIcon className="size-4" />
              </BubbleBtn>
              <BubbleBtn
                label="Strikethrough"
                shortcut="⌘⇧S"
                active={editor.isActive("strike")}
                onClick={() => bubbleCh(editor).toggleStrike().run()}
              >
                <Strikethrough className="size-4" />
              </BubbleBtn>
              <BubbleBtn
                label="Code"
                shortcut="⌘E"
                active={editor.isActive("code")}
                onClick={() => bubbleCh(editor).toggleCode().run()}
              >
                <Code className="size-4" />
              </BubbleBtn>
              <BubbleBtn
                label="Link"
                shortcut="⌘K"
                active={editor.isActive("link")}
                onClick={() => {
                  const prev = editor.getAttributes("link").href as
                    | string
                    | undefined;
                  const href = window.prompt("URL", prev ?? "https://");
                  if (href === null) return;
                  if (href === "") {
                    bubbleCh(editor).unsetLink().run();
                    return;
                  }
                  bubbleCh(editor).setLink({ href }).run();
                }}
              >
                <Link2 className="size-4" />
              </BubbleBtn>
            </BubbleMenu>
          ) : null}
        </div>
      </div>
      <style>{`
        .collaboration-cursor__label {
          border-radius: 6px 6px 6px 0;
          color: #fff;
          font-size: 11px;
          font-weight: 600;
          padding: 3px 8px;
          position: absolute;
          top: -1.25em;
          left: -1px;
          white-space: nowrap;
          pointer-events: none;
          box-shadow: 0 2px 8px rgba(0,0,0,0.12);
        }
        .collaboration-cursor__caret {
          border-left: 2px solid;
          border-right: none;
          margin-left: -1px;
          margin-right: -1px;
          position: relative;
          word-break: normal;
        }
      `}</style>
    </TooltipProvider>
  );
}

function BubbleBtn({
  label,
  shortcut,
  active,
  onClick,
  children,
}: {
  label: string;
  shortcut: string;
  active: boolean;
  onClick: () => void;
  children: React.ReactNode;
}) {
  return (
    <Tooltip>
      <TooltipTrigger asChild>
        <Button
          type="button"
          variant="ghost"
          size="icon"
          className={cn(
            "size-8",
            active && "bg-primary/15 text-primary hover:bg-primary/20",
          )}
          onClick={onClick}
        >
          {children}
        </Button>
      </TooltipTrigger>
      <TooltipContent side="top">
        {label}
        <span className="ml-2 text-xs opacity-70">{shortcut}</span>
      </TooltipContent>
    </Tooltip>
  );
}

/**
 * Block editor wired to Yjs + Hocuspocus with live cursors and presence.
 * Falls back to {@link BlockEditor} if the collaboration session cannot be established.
 */
export function CollaborativeBlockEditor({
  documentId,
  userName,
  userColor,
  ...rest
}: CollaborativeBlockEditorProps) {
  const documentName = `object:${documentId}`;
  const collab = useCollaboration(documentName);

  const displayName = userName?.trim() || "Anonymous";
  const cursorColor = userColor ?? colorFromUserName(displayName);

  if (collab.error) {
    return <BlockEditor {...rest} />;
  }

  if (!collab.doc || !collab.provider) {
    return (
      <div
        className={cn(
          "overflow-hidden rounded-xl border border-border bg-card text-card-foreground shadow-sm",
          rest.className,
        )}
      >
        <div className="flex flex-wrap items-center justify-between gap-3 border-b border-border/80 bg-muted/30 px-3 py-2">
          <ConnectionStatus status="connecting" />
        </div>
        <div className="flex min-h-[280px] items-center justify-center bg-background px-6 text-sm text-muted-foreground">
          Preparing collaboration…
        </div>
      </div>
    );
  }

  return (
    <CollaborativeEditorShell
      collab={
        collab as CollaborationConnection & {
          doc: NonNullable<CollaborationConnection["doc"]>;
          provider: NonNullable<CollaborationConnection["provider"]>;
        }
      }
      displayName={displayName}
      cursorColor={cursorColor}
      documentName={documentName}
      placeholder={rest.placeholder}
      onChange={rest.onChange}
      editable={rest.editable}
      className={rest.className}
    />
  );
}