"use client";

import { useEffect, useState } from "react";
import { useEditor, EditorContent } from "@tiptap/react";
import StarterKit from "@tiptap/starter-kit";
import Placeholder from "@tiptap/extension-placeholder";
import { Markdown } from "tiptap-markdown";
import { Bold, Code, Heading2, Heading3, Italic, List, ListOrdered } from "lucide-react";
import { cn } from "@/lib/utils";

type Props = {
  value: string;
  onChange: (v: string) => void;
  placeholder?: string;
  className?: string;
};

const mdClasses =
  "[&_strong]:font-bold [&_em]:italic [&_code]:rounded [&_code]:bg-muted [&_code]:px-1 [&_code]:text-[0.85em] [&_h2]:text-base [&_h2]:font-bold [&_h2]:mt-3 [&_h3]:text-sm [&_h3]:font-bold [&_h3]:mt-2 [&_ul]:list-disc [&_ul]:pr-5 [&_ol]:list-decimal [&_ol]:pr-5 [&_li]:mt-0.5 [&_p]:leading-relaxed [&_p+p]:mt-2 [&_a]:underline [&_a]:text-primary";

export function RichEditor({ value, onChange, placeholder, className }: Props) {
  const [tab, setTab] = useState<"edit" | "preview">("edit");
  const [preview, setPreview] = useState("");

  const editor = useEditor({
    extensions: [
      StarterKit.configure({ codeBlock: false }),
      Placeholder.configure({ placeholder: placeholder ?? "توضیحات را اینجا بنویسید…" }),
      Markdown.configure({ transformPastedText: true }),
    ],
    content: value,
    immediatelyRender: false,
    onUpdate({ editor: e }) {
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      const md = (e.storage as any).markdown?.getMarkdown?.() ?? e.getText();
      onChange(md);
    },
  });

  useEffect(() => {
    if (!editor) return;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const current = (editor.storage as any).markdown?.getMarkdown?.() ?? editor.getText();
    if (current !== value) {
      editor.commands.setContent(value, { emitUpdate: false });
    }
  }, [value, editor]);

  useEffect(() => {
    if (tab !== "preview") return;
    let cancelled = false;
    void (async () => {
      const { marked } = await import("marked");
      const DOMPurify = (await import("dompurify")).default;
      const html = await marked(value);
      if (!cancelled) setPreview(DOMPurify.sanitize(html));
    })();
    return () => { cancelled = true; };
  }, [tab, value]);

  const ToolBtn = ({
    onClick,
    active,
    title,
    children,
  }: {
    onClick: () => void;
    active?: boolean;
    title: string;
    children: React.ReactNode;
  }) => (
    <button
      type="button"
      onMouseDown={(e) => {
        e.preventDefault();
        onClick();
      }}
      title={title}
      className={cn(
        "grid h-7 w-7 place-items-center rounded transition-colors",
        active
          ? "bg-primary/15 text-primary"
          : "text-muted-foreground hover:bg-muted hover:text-foreground",
      )}
    >
      {children}
    </button>
  );

  return (
    <div className={cn("rounded-md border border-input bg-background", className)}>
      {/* Tab bar */}
      <div className="flex items-center justify-between gap-1 border-b border-input px-2 py-1">
        <div className="flex gap-0.5">
          {editor && (
            <>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleBold().run()}
                active={editor.isActive("bold")}
                title="توپر"
              >
                <Bold className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleItalic().run()}
                active={editor.isActive("italic")}
                title="مورب"
              >
                <Italic className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleCode().run()}
                active={editor.isActive("code")}
                title="کد درون‌خطی"
              >
                <Code className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleHeading({ level: 2 }).run()}
                active={editor.isActive("heading", { level: 2 })}
                title="سرتیتر ۲"
              >
                <Heading2 className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleHeading({ level: 3 }).run()}
                active={editor.isActive("heading", { level: 3 })}
                title="سرتیتر ۳"
              >
                <Heading3 className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleBulletList().run()}
                active={editor.isActive("bulletList")}
                title="فهرست"
              >
                <List className="h-3.5 w-3.5" />
              </ToolBtn>
              <ToolBtn
                onClick={() => editor.chain().focus().toggleOrderedList().run()}
                active={editor.isActive("orderedList")}
                title="فهرست عددی"
              >
                <ListOrdered className="h-3.5 w-3.5" />
              </ToolBtn>
            </>
          )}
        </div>
        <div className="flex gap-1 text-xs">
          <button
            type="button"
            onClick={() => setTab("edit")}
            className={cn(
              "rounded px-2 py-0.5 transition-colors",
              tab === "edit" ? "bg-primary/15 text-primary font-medium" : "text-muted-foreground hover:text-foreground",
            )}
          >
            ویرایش
          </button>
          <button
            type="button"
            onClick={() => setTab("preview")}
            className={cn(
              "rounded px-2 py-0.5 transition-colors",
              tab === "preview" ? "bg-primary/15 text-primary font-medium" : "text-muted-foreground hover:text-foreground",
            )}
          >
            پیش‌نمایش
          </button>
        </div>
      </div>

      {/* Editor / Preview */}
      {tab === "edit" ? (
        <EditorContent
          editor={editor}
          dir="auto"
          className={cn(
            "px-3 py-2 text-sm focus-within:outline-none",
            mdClasses,
            "[&_.ProseMirror]:min-h-[80px] [&_.ProseMirror]:outline-none",
            "[&_.ProseMirror_p.is-editor-empty:first-child::before]:text-muted-foreground/50 [&_.ProseMirror_p.is-editor-empty:first-child::before]:content-[attr(data-placeholder)] [&_.ProseMirror_p.is-editor-empty:first-child::before]:float-right [&_.ProseMirror_p.is-editor-empty:first-child::before]:pointer-events-none",
          )}
        />
      ) : (
        <div
          dir="auto"
          className={cn("px-3 py-2 text-sm", mdClasses)}
          dangerouslySetInnerHTML={{
            __html: preview || "<p class='text-muted-foreground text-sm'>پیش‌نمایشی نیست.</p>",
          }}
        />
      )}
    </div>
  );
}