"use client";

import { type ChangeEvent, useEffect, useRef, useState } from "react";
import { EditorContent, useEditor } from "@tiptap/react";
import StarterKit from "@tiptap/starter-kit";
import Underline from "@tiptap/extension-underline";
import Link from "@tiptap/extension-link";
import Placeholder from "@tiptap/extension-placeholder";
import Image from "@tiptap/extension-image";

type TiptapHtmlEditorProps = {
  value: string;
  onChange: (html: string) => void;
  placeholder?: string;
  onUploadImage?: (file: File) => Promise<string>;
};

type ToolbarButtonProps = {
  active?: boolean;
  disabled?: boolean;
  label: string;
  onClick: () => void;
};

function ToolbarButton({ active = false, disabled = false, label, onClick }: ToolbarButtonProps) {
  return (
    <button
      type="button"
      onClick={onClick}
      disabled={disabled}
      className={`rounded-full border px-3 py-2 text-[11px] font-black uppercase tracking-[0.14em] transition ${
        active
          ? "border-[#FF5722] bg-[#FFF4EF] text-[#112015]"
          : "border-[#112015]/10 bg-white text-[#536256] hover:border-[#8BC34A] hover:text-[#112015]"
      } ${disabled ? "cursor-not-allowed opacity-50 hover:border-[#112015]/10 hover:text-[#536256]" : ""}`}
    >
      {label}
    </button>
  );
}

export default function TiptapHtmlEditor({
  value,
  onChange,
  placeholder = "Skriv artikkelen her...",
  onUploadImage,
}: TiptapHtmlEditorProps) {
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const [isUploading, setIsUploading] = useState(false);
  const editor = useEditor({
    extensions: [
      StarterKit.configure({
        heading: {
          levels: [2, 3],
        },
      }),
      Underline,
      Link.configure({
        autolink: true,
        openOnClick: false,
        protocols: ["http", "https", "mailto"],
      }),
      Image,
      Placeholder.configure({
        placeholder,
      }),
    ],
    content: value || "<p></p>",
    immediatelyRender: false,
    editorProps: {
      attributes: {
        class:
          "min-h-[28rem] rounded-[1.5rem] border border-[#112015]/10 bg-white px-5 py-5 text-base leading-8 text-[#112015] outline-none focus:border-[#8BC34A]",
      },
    },
    onUpdate: ({ editor: currentEditor }) => {
      onChange(currentEditor.getHTML());
    },
  });

  useEffect(() => {
    if (!editor) return;
    const currentHtml = editor.getHTML();
    if (value !== currentHtml) {
      editor.commands.setContent(value || "<p></p>", { emitUpdate: false });
    }
  }, [editor, value]);

  if (!editor) {
    return (
      <div className="rounded-[1.5rem] border border-[#112015]/10 bg-white px-5 py-5 text-sm font-bold text-[#536256]">
        Laster editor...
      </div>
    );
  }

  const setLink = () => {
    const previousUrl = editor.getAttributes("link").href as string | undefined;
    const url = window.prompt("Lenke-URL", previousUrl || "https://");
    if (url === null) return;
    if (url.trim() === "") {
      editor.chain().focus().extendMarkRange("link").unsetLink().run();
      return;
    }
    editor.chain().focus().extendMarkRange("link").setLink({ href: url.trim() }).run();
  };

  const insertImage = () => {
    const url = window.prompt("Bilde-URL", "https://");
    if (!url || !url.trim()) return;
    editor.chain().focus().setImage({ src: url.trim() }).run();
  };

  const triggerImageUpload = () => {
    fileInputRef.current?.click();
  };

  const handleImageUpload = async (event: ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    event.target.value = "";

    if (!file || !onUploadImage) return;

    setIsUploading(true);
    try {
      const url = await onUploadImage(file);
      editor.chain().focus().setImage({ src: url, alt: file.name }).run();
    } catch (error) {
      window.alert(error instanceof Error ? error.message : "Kunne ikke laste opp bildet.");
    } finally {
      setIsUploading(false);
    }
  };

  return (
    <div className="space-y-4">
      <input
        ref={fileInputRef}
        type="file"
        accept="image/*"
        className="hidden"
        onChange={handleImageUpload}
      />

      <div className="flex flex-wrap gap-2 rounded-[1.5rem] border border-[#112015]/8 bg-[#F7F9F2] p-3">
        <ToolbarButton label="Brødtekst" onClick={() => editor.chain().focus().setParagraph().run()} />
        <ToolbarButton
          label="H2"
          active={editor.isActive("heading", { level: 2 })}
          onClick={() => editor.chain().focus().toggleHeading({ level: 2 }).run()}
        />
        <ToolbarButton
          label="H3"
          active={editor.isActive("heading", { level: 3 })}
          onClick={() => editor.chain().focus().toggleHeading({ level: 3 }).run()}
        />
        <ToolbarButton
          label="Bold"
          active={editor.isActive("bold")}
          onClick={() => editor.chain().focus().toggleBold().run()}
        />
        <ToolbarButton
          label="Italic"
          active={editor.isActive("italic")}
          onClick={() => editor.chain().focus().toggleItalic().run()}
        />
        <ToolbarButton
          label="Underline"
          active={editor.isActive("underline")}
          onClick={() => editor.chain().focus().toggleUnderline().run()}
        />
        <ToolbarButton
          label="Punktliste"
          active={editor.isActive("bulletList")}
          onClick={() => editor.chain().focus().toggleBulletList().run()}
        />
        <ToolbarButton
          label="Nummerert"
          active={editor.isActive("orderedList")}
          onClick={() => editor.chain().focus().toggleOrderedList().run()}
        />
        <ToolbarButton
          label="Sitat"
          active={editor.isActive("blockquote")}
          onClick={() => editor.chain().focus().toggleBlockquote().run()}
        />
        <ToolbarButton
          label="Lenke"
          active={editor.isActive("link")}
          onClick={setLink}
        />
        <ToolbarButton
          label={isUploading ? "Laster opp..." : "Last opp bilde"}
          onClick={triggerImageUpload}
          disabled={isUploading || !onUploadImage}
        />
        <ToolbarButton label="Bilde-URL" onClick={insertImage} />
        <ToolbarButton label="Angre" onClick={() => editor.chain().focus().undo().run()} />
        <ToolbarButton label="Gjør om" onClick={() => editor.chain().focus().redo().run()} />
      </div>

      <div className="rounded-[1.75rem] border border-[#112015]/8 bg-[#FCFDF9] p-3 sm:p-4">
        <EditorContent editor={editor} />
      </div>
    </div>
  );
}