/**
 * Rich text HTML editor for email compose, powered by TipTap.
 * Toolbar: bold, italic, underline, strikethrough, headings, lists,
 * alignment, text color, link, image, code block, undo/redo.
 */

import React, { useCallback } from 'react';
import { useTranslation } from 'react-i18next';
import { useEditor, EditorContent } from '@tiptap/react';
import StarterKit from '@tiptap/starter-kit';
import Underline from '@tiptap/extension-underline';
import Link from '@tiptap/extension-link';
import TextAlign from '@tiptap/extension-text-align';
import { Color } from '@tiptap/extension-color';
import { TextStyle } from '@tiptap/extension-text-style';
import Image from '@tiptap/extension-image';
import Placeholder from '@tiptap/extension-placeholder';
import clsx from 'clsx';
import { AlignCenter, AlignLeft, AlignRight, Bold, ChevronsLeft, Code, Heading, Image as ImageIcon, Italic, Link2, List, Menu, Quote, Redo2, Strikethrough, Underline as UnderlineIcon, Undo2 } from 'lucide-react';

export interface RichTextEditorProps {
  content: string;
  onChange: (html: string) => void;
  placeholder?: string;
  editable?: boolean;
}

interface ToolbarButtonProps {
  onClick: () => void;
  disabled?: boolean;
  active?: boolean;
  label: string;
  children: React.ReactNode;
}

function ToolbarButton({ onClick, disabled, active, label, children }: ToolbarButtonProps) {
  return (
    <button
      type="button"
      onClick={onClick}
      disabled={disabled}
      className={clsx(
        'p-1.5 rounded hover:bg-secondary-100 transition-colors',
        active && 'bg-primary-50 text-primary-600',
        disabled && 'opacity-40 cursor-not-allowed',
      )}
      title={label}
      aria-label={label}
    >
      {children}
    </button>
  );
}

export function RichTextEditor({ content, onChange, placeholder, editable = true }: RichTextEditorProps) {
  const { t } = useTranslation();

  const editor = useEditor({
    extensions: [
      StarterKit.configure({
        heading: { levels: [1, 2, 3] },
      }),
      Underline,
      Link.configure({
        openOnClick: false,
        HTMLAttributes: { rel: 'noopener noreferrer nofollow' },
      }),
      TextAlign.configure({ types: ['heading', 'paragraph'] }),
      TextStyle,
      Color,
      Image.configure({ inline: true, allowBase64: true }),
      Placeholder.configure({
        placeholder: placeholder || 'Write your email...',
      }),
    ],
    content,
    editable,
    onUpdate: ({ editor }) => {
      onChange(editor.getHTML());
    },
    editorProps: {
      attributes: {
        class: 'prose prose-sm max-w-none min-h-48 focus:outline-none px-4 py-3',
        'data-testid': 'rich-text-editor',
      },
    },
  });

  // Sync external content changes (e.g. template/signature insert, reply/forward/draft load)
  React.useEffect(() => {
    if (editor && content !== editor.getHTML()) {
      editor.commands.setContent(content, { emitUpdate: false });
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [content, editor]);

  const setLink = useCallback(() => {
    if (!editor) return;
    const previousUrl = editor.getAttributes('link').href;
    const url = window.prompt(t('mail.linkUrl'), previousUrl);
    if (url === null) return;
    if (url === '') {
      editor.chain().focus().extendMarkRange('link').unsetLink().run();
      return;
    }
    editor.chain().focus().extendMarkRange('link').setLink({ href: url }).run();
  }, [editor, t]);

  const addImage = useCallback(() => {
    if (!editor) return;
    const url = window.prompt('Image URL');
    if (url) {
      editor.chain().focus().setImage({ src: url }).run();
    }
  }, [editor]);

  if (!editor) return null;

  return (
    <div className="border border-secondary-300 rounded-md overflow-hidden" data-testid="rich-text-editor-container">
      {/* Toolbar */}
      <div className="flex flex-wrap items-center gap-0.5 border-b border-secondary-200 bg-secondary-50 px-2 py-1" data-testid="rich-text-toolbar">
        {/* Undo / Redo */}
        <ToolbarButton onClick={() => editor.chain().focus().undo().run()} disabled={!editor.can().undo()} label={t('common.undo')}>
          <Undo2 className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().redo().run()} disabled={!editor.can().redo()} label={t('common.redo')}>
          <Redo2 className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Headings */}
        <ToolbarButton onClick={() => editor.chain().focus().toggleHeading({ level: 1 }).run()} active={editor.isActive('heading', { level: 1 })} label="H1">
          <span className="text-sm font-bold w-4 text-center block">H1</span>
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleHeading({ level: 2 }).run()} active={editor.isActive('heading', { level: 2 })} label="H2">
          <span className="text-sm font-bold w-4 text-center block">H2</span>
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleHeading({ level: 3 }).run()} active={editor.isActive('heading', { level: 3 })} label="H3">
          <span className="text-sm font-bold w-4 text-center block">H3</span>
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Inline formatting */}
        <ToolbarButton onClick={() => editor.chain().focus().toggleBold().run()} active={editor.isActive('bold')} label={t('mail.bold')}>
          <Bold className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleItalic().run()} active={editor.isActive('italic')} label={t('mail.italic')}>
          <Italic className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleUnderline().run()} active={editor.isActive('underline')} label="Underline">
          <UnderlineIcon className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleStrike().run()} active={editor.isActive('strike')} label="Strikethrough">
          <Strikethrough className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Lists */}
        <ToolbarButton onClick={() => editor.chain().focus().toggleBulletList().run()} active={editor.isActive('bulletList')} label="Bullet list">
          <Menu className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleOrderedList().run()} active={editor.isActive('orderedList')} label="Numbered list">
          <List className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleBlockquote().run()} active={editor.isActive('blockquote')} label="Quote">
          <Quote className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleCode().run()} active={editor.isActive('code')} label="Inline code">
          <ChevronsLeft className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().toggleCodeBlock().run()} active={editor.isActive('codeBlock')} label="Code block">
          <Code className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Alignment */}
        <ToolbarButton onClick={() => editor.chain().focus().setTextAlign('left').run()} active={editor.isActive({ textAlign: 'left' })} label="Align left">
          <AlignLeft className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().setTextAlign('center').run()} active={editor.isActive({ textAlign: 'center' })} label="Align center">
          <AlignCenter className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().setTextAlign('right').run()} active={editor.isActive({ textAlign: 'right' })} label="Align right">
          <AlignRight className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={() => editor.chain().focus().setTextAlign('justify').run()} active={editor.isActive({ textAlign: 'justify' })} label="Justify">
          <Menu className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Color */}
        <label className="p-1.5 rounded hover:bg-secondary-100 cursor-pointer" title="Text color">
          <Heading className="w-4 h-4" strokeWidth={2} />
          <input
            type="color"
            className="sr-only"
            onChange={(e) => editor.chain().focus().setColor(e.target.value).run()}
            title="Text color"
          />
        </label>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Link & Image */}
        <ToolbarButton onClick={setLink} active={editor.isActive('link')} label={t('mail.insertLink')}>
          <Link2 className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
        <ToolbarButton onClick={addImage} label="Insert image">
          <ImageIcon className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>

        <div className="w-px h-6 bg-secondary-200 mx-1" />

        {/* Clear formatting */}
        <ToolbarButton onClick={() => editor.chain().focus().unsetAllMarks().run()} label="Clear formatting">
          <Quote className="w-4 h-4" strokeWidth={2} />
        </ToolbarButton>
      </div>

      {/* Editor area */}
      <div className="overflow-y-auto max-h-96 min-h-48">
        <EditorContent editor={editor} />
      </div>
    </div>
  );
}