'use client';

import { useState, useCallback } from 'react';
import { useTranslations } from 'next-intl';
import { useEditor, EditorContent } from '@tiptap/react';
import StarterKit from '@tiptap/starter-kit';
import Paragraph from '@tiptap/extension-paragraph';
import Underline from '@tiptap/extension-underline';
import Link from '@tiptap/extension-link';
import TextAlign from '@tiptap/extension-text-align';
import { TextStyle } from '@tiptap/extension-text-style';
import Color from '@tiptap/extension-color';
import { useFocusTrap } from '@/hooks/use-focus-trap';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { cn } from '@/lib/utils';
import { htmlToPlainText } from '@/lib/html-to-text';
import type { Signature } from '@/stores/signature-store';
import {
  Bold,
  Italic,
  Underline as UnderlineIcon,
  Strikethrough,
  List,
  ListOrdered,
  AlignLeft,
  AlignCenter,
  AlignRight,
  Link as LinkIcon,
  Baseline,
  X,
} from 'lucide-react';

interface SignatureEditorModalProps {
  signature?: Signature | null;
  onSave: (data: { name: string; body: string; plainText: string }) => void;
  onClose: () => void;
}

const StyledParagraph = Paragraph.extend({
  addAttributes() {
    return {
      ...this.parent?.(),
      style: {
        default: null as string | null,
        parseHTML: (el: HTMLElement) => el.getAttribute('style'),
        renderHTML: (attrs: Record<string, string | null>) =>
          attrs.style ? { style: attrs.style } : {},
      },
      class: {
        default: null as string | null,
        parseHTML: (el: HTMLElement) => el.getAttribute('class'),
        renderHTML: (attrs: Record<string, string | null>) =>
          attrs.class ? { class: attrs.class } : {},
      },
    };
  },
});

const TEXT_COLORS = [
  '#000000', '#5f6368', '#9aa0a6', '#c5221f', '#e8710a', '#f9ab00', '#188038', '#1967d2',
  '#7627bb', '#c2185b', '#795548', '#fa5252', '#fd7e14', '#40c057', '#4dabf7', '#e64980',
];

function ToolbarButton({
  active,
  onClick,
  children,
  title,
  disabled,
}: {
  active?: boolean;
  onClick: () => void;
  children: React.ReactNode;
  title: string;
  disabled?: boolean;
}) {
  return (
    <button
      type="button"
      onClick={onClick}
      disabled={disabled}
      title={title}
      className={cn(
        'p-1.5 rounded hover:bg-accent transition-colors',
        active && 'bg-accent text-accent-foreground',
        disabled && 'opacity-40 cursor-not-allowed'
      )}
    >
      {children}
    </button>
  );
}

function ToolbarSeparator() {
  return <div className="w-px h-5 bg-border mx-0.5" />;
}

export function SignatureEditorModal({
  signature,
  onSave,
  onClose,
}: SignatureEditorModalProps) {
  const t = useTranslations('signatures');
  const tCommon = useTranslations('common');
  const isEditing = !!signature;

  const [name, setName] = useState(signature?.name ?? '');
  const [nameError, setNameError] = useState('');
  const [showPreview, setShowPreview] = useState(false);
  const [colorMenuOpen, setColorMenuOpen] = useState(false);

  const dialogRef = useFocusTrap({
    isActive: true,
    onEscape: onClose,
    restoreFocus: true,
  });

  const editor = useEditor({
    extensions: [
      StarterKit.configure({
        heading: false,
        paragraph: false,
        link: false,
        underline: false,
        codeBlock: false,
      }),
      StyledParagraph,
      Underline,
      Link.configure({
        openOnClick: false,
        HTMLAttributes: { rel: 'noopener noreferrer nofollow' },
      }),
      TextAlign.configure({
        types: ['paragraph'],
      }),
      TextStyle,
      Color,
    ],
    content: signature?.body ?? '<p></p>',
    editorProps: {
      attributes: {
        class: 'tiptap min-h-[120px] px-3 py-2 text-sm text-foreground focus:outline-none',
      },
    },
    immediatelyRender: false,
  });

  const addLink = useCallback(() => {
    if (!editor) return;
    const previousUrl = editor.getAttributes('link').href;
    const url = window.prompt('URL', 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]);

  const handleSave = () => {
    const trimmedName = name.trim();
    if (!trimmedName) {
      setNameError(t('name_required'));
      return;
    }
    const html = editor?.getHTML() ?? '<p></p>';
    const plainText = htmlToPlainText(html);
    onSave({ name: trimmedName, body: html, plainText });
  };

  const bodyHtml = editor?.getHTML() ?? '';
  const bodyPlainText = htmlToPlainText(bodyHtml);

  return (
    <div className="fixed inset-0 bg-black/50 backdrop-blur-[1px] flex items-start justify-center z-[60] p-4 pt-[10vh] animate-in fade-in duration-150">
      <div
        ref={dialogRef}
        role="dialog"
        aria-modal="true"
        className="bg-background border border-border rounded-lg shadow-xl w-full max-w-2xl animate-in zoom-in-95 duration-200"
      >
        <div className="flex items-center justify-between px-6 py-4 border-b border-border">
          <h2 className="text-lg font-semibold text-foreground">
            {isEditing ? t('edit_signature') : t('new_signature')}
          </h2>
          <Button variant="ghost" size="icon" onClick={onClose} className="h-8 w-8" aria-label="Close">
            <X className="w-4 h-4" />
          </Button>
        </div>

        <div className="p-6 space-y-4 max-h-[70vh] overflow-y-auto">
          <div>
            <label htmlFor="sig-name" className="block text-sm font-medium mb-1">
              {t('name_label')}
            </label>
            <Input
              id="sig-name"
              type="text"
              value={name}
              onChange={(e) => {
                setName(e.target.value);
                if (nameError) setNameError('');
              }}
              placeholder={t('name_placeholder')}
              className={cn(nameError && 'border-destructive')}
              aria-invalid={!!nameError}
              aria-describedby={nameError ? 'sig-name-error' : undefined}
            />
            {nameError && (
              <p id="sig-name-error" className="text-sm text-destructive mt-1" role="alert">
                {nameError}
              </p>
            )}
          </div>

          <div>
            <div className="flex items-center justify-between mb-1">
              <span className="text-sm font-medium">{t('editor_label')}</span>
              <Button
                type="button"
                variant="ghost"
                size="sm"
                onClick={() => setShowPreview(!showPreview)}
                className="h-7 text-xs"
              >
                {showPreview ? t('show_editor') : t('show_preview')}
              </Button>
            </div>

            {showPreview ? (
              <div className="border border-border rounded-md bg-muted/30 p-4 min-h-[200px]">
                <div className="text-xs text-muted-foreground mb-2 font-medium">
                  {t('html_preview_label')}
                </div>
                <div
                  className="text-sm text-foreground [&_a]:text-primary [&_a]:underline-offset-2"
                  dangerouslySetInnerHTML={{ __html: bodyHtml }}
                />
                <div className="mt-4 pt-4 border-t border-border">
                  <div className="text-xs text-muted-foreground mb-2 font-medium">
                    {t('plain_text_preview_label')}
                  </div>
                  <pre className="text-sm text-foreground whitespace-pre-wrap font-sans">
                    {bodyPlainText}
                  </pre>
                </div>
              </div>
            ) : (
              <div className={cn('flex flex-col border border-border rounded-md overflow-hidden')}>
                <div className="flex flex-wrap items-center gap-0.5 px-3 py-1.5 border-b border-border/50 bg-muted/30">
                  <ToolbarButton
                    active={editor?.isActive('bold')}
                    onClick={() => editor?.chain().focus().toggleBold().run()}
                    title={t('toolbar.bold')}
                  >
                    <Bold className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive('italic')}
                    onClick={() => editor?.chain().focus().toggleItalic().run()}
                    title={t('toolbar.italic')}
                  >
                    <Italic className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive('underline')}
                    onClick={() => editor?.chain().focus().toggleUnderline().run()}
                    title={t('toolbar.underline')}
                  >
                    <UnderlineIcon className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive('strike')}
                    onClick={() => editor?.chain().focus().toggleStrike().run()}
                    title={t('toolbar.strikethrough')}
                  >
                    <Strikethrough className="w-4 h-4" />
                  </ToolbarButton>

                  <div className="relative">
                    <ToolbarButton
                      active={!!editor?.getAttributes('textStyle').color}
                      onClick={() => setColorMenuOpen((v) => !v)}
                      title={t('toolbar.text_color')}
                    >
                      <Baseline
                        className="w-4 h-4"
                        style={{ color: editor?.getAttributes('textStyle').color || undefined }}
                      />
                    </ToolbarButton>
                    {colorMenuOpen && (
                      <div className="absolute z-50 top-full start-0 mt-1 bg-popover border border-border rounded-md shadow-md p-2">
                        <div
                          className="grid gap-0.5"
                          style={{ gridTemplateColumns: 'repeat(8, 1fr)' }}
                        >
                          {TEXT_COLORS.map((color) => (
                            <button
                              key={color}
                              type="button"
                              title={color}
                              onClick={() => {
                                editor?.chain().focus().setColor(color).run();
                                setColorMenuOpen(false);
                              }}
                              className={cn(
                                'w-4 h-4 border border-border/60 rounded-[2px] transition-transform hover:scale-110',
                                editor?.getAttributes('textStyle').color === color &&
                                  'ring-1 ring-ring ring-offset-1'
                              )}
                              style={{ backgroundColor: color }}
                            />
                          ))}
                        </div>
                        <div className="h-px bg-border my-1.5" />
                        <button
                          type="button"
                          className="flex items-center gap-2 px-2 py-1 text-sm rounded hover:bg-accent text-start w-full"
                          onClick={() => {
                            editor?.chain().focus().unsetColor().run();
                            setColorMenuOpen(false);
                          }}
                        >
                          {t('toolbar.remove_color')}
                        </button>
                      </div>
                    )}
                  </div>

                  <ToolbarSeparator />

                  <ToolbarButton
                    active={editor?.isActive('bulletList')}
                    onClick={() => editor?.chain().focus().toggleBulletList().run()}
                    title={t('toolbar.bullet_list')}
                  >
                    <List className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive('orderedList')}
                    onClick={() => editor?.chain().focus().toggleOrderedList().run()}
                    title={t('toolbar.ordered_list')}
                  >
                    <ListOrdered className="w-4 h-4" />
                  </ToolbarButton>

                  <ToolbarSeparator />

                  <ToolbarButton
                    active={editor?.isActive({ textAlign: 'left' })}
                    onClick={() => editor?.chain().focus().setTextAlign('left').run()}
                    title={t('toolbar.align_left')}
                  >
                    <AlignLeft className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive({ textAlign: 'center' })}
                    onClick={() => editor?.chain().focus().setTextAlign('center').run()}
                    title={t('toolbar.align_center')}
                  >
                    <AlignCenter className="w-4 h-4" />
                  </ToolbarButton>
                  <ToolbarButton
                    active={editor?.isActive({ textAlign: 'right' })}
                    onClick={() => editor?.chain().focus().setTextAlign('right').run()}
                    title={t('toolbar.align_right')}
                  >
                    <AlignRight className="w-4 h-4" />
                  </ToolbarButton>

                  <ToolbarSeparator />

                  <ToolbarButton
                    active={editor?.isActive('link')}
                    onClick={addLink}
                    title={t('toolbar.link')}
                  >
                    <LinkIcon className="w-4 h-4" />
                  </ToolbarButton>
                </div>
                <EditorContent editor={editor} />
              </div>
            )}
          </div>
        </div>

        <div className="flex items-center justify-end gap-3 px-6 pb-6">
          <Button variant="outline" onClick={onClose}>
            {tCommon('cancel')}
          </Button>
          <Button onClick={handleSave}>
            {tCommon('save')}
          </Button>
        </div>
      </div>
    </div>
  );
}