'use client';

/**
 * Editor enriquecido ligero para notas de Seguimiento
 * (barra tipo Google Docs: negrita, color, resaltado, listas, enlaces).
 */

import React, { useCallback, useEffect, useRef } from 'react';
import {
  Bold,
  Italic,
  Underline,
  List,
  ListOrdered,
  Link as LinkIcon,
  Highlighter,
  Type,
  RemoveFormatting,
  AlignLeft,
  AlignCenter,
  AlignRight,
} from 'lucide-react';

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

function run(cmd: string, value?: string) {
  try {
    document.execCommand(cmd, false, value);
  } catch {
    /* ignore */
  }
}

function ToolbarBtn({
  title,
  active,
  onClick,
  children,
}: {
  title: string;
  active?: boolean;
  onClick: () => void;
  children: React.ReactNode;
}) {
  return (
    <button
      type="button"
      title={title}
      onMouseDown={(e) => {
        e.preventDefault(); // keep selection in editor
        onClick();
      }}
      className={`inline-flex items-center justify-center w-8 h-8 rounded-md text-gray-700 hover:bg-gray-100 ${
        active ? 'bg-sky-100 text-sky-800' : ''
      }`}
    >
      {children}
    </button>
  );
}

const TEXT_COLORS = [
  { label: 'Negro', value: '#111827' },
  { label: 'Rojo', value: '#DC2626' },
  { label: 'Naranja', value: '#EA580C' },
  { label: 'Ámbar', value: '#D97706' },
  { label: 'Verde', value: '#059669' },
  { label: 'Azul', value: '#2563EB' },
  { label: 'Violeta', value: '#7C3AED' },
];

const HIGHLIGHTS = [
  { label: 'Ninguno', value: 'transparent' },
  { label: 'Amarillo', value: '#FEF08A' },
  { label: 'Verde', value: '#BBF7D0' },
  { label: 'Azul', value: '#BFDBFE' },
  { label: 'Rosa', value: '#FECDD3' },
  { label: 'Naranja', value: '#FED7AA' },
];

export default function NoteRichEditor({
  value,
  onChange,
  placeholder = 'Escribe la nota…',
  className = '',
  minHeight = '140px',
}: Props) {
  const ref = useRef<HTMLDivElement>(null);
  const lastHtml = useRef(value);

  useEffect(() => {
    const el = ref.current;
    if (!el) return;
    if (value !== lastHtml.current && el.innerHTML !== value) {
      el.innerHTML = value || '';
      lastHtml.current = value;
    }
  }, [value]);

  const emit = useCallback(() => {
    const el = ref.current;
    if (!el) return;
    const html = el.innerHTML;
    lastHtml.current = html;
    onChange(html);
  }, [onChange]);

  const apply = (fn: () => void) => {
    ref.current?.focus();
    fn();
    emit();
  };

  const addLink = () => {
    const url = window.prompt('URL del enlace', 'https://');
    if (!url) return;
    apply(() => run('createLink', url));
  };

  return (
    <div
      className={`rounded-xl border border-gray-200 bg-white overflow-hidden ${className}`}
    >
      <div className="flex flex-wrap items-center gap-0.5 px-2 py-1.5 border-b border-gray-100 bg-gray-50">
        <ToolbarBtn title="Negrita" onClick={() => apply(() => run('bold'))}>
          <Bold className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn title="Cursiva" onClick={() => apply(() => run('italic'))}>
          <Italic className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn
          title="Subrayado"
          onClick={() => apply(() => run('underline'))}
        >
          <Underline className="w-3.5 h-3.5" />
        </ToolbarBtn>

        <span className="w-px h-5 bg-gray-200 mx-1" />

        <label className="inline-flex items-center gap-1 text-[11px] text-gray-600 px-1">
          <Type className="w-3.5 h-3.5" />
          <select
            className="bg-transparent text-xs border-0 focus:ring-0 cursor-pointer"
            defaultValue="3"
            title="Tamaño"
            onMouseDown={(e) => e.stopPropagation()}
            onChange={(e) =>
              apply(() => run('fontSize', e.target.value))
            }
          >
            <option value="2">Pequeño</option>
            <option value="3">Normal</option>
            <option value="4">Mediano</option>
            <option value="5">Grande</option>
            <option value="6">Muy grande</option>
          </select>
        </label>

        <label className="inline-flex items-center gap-1 text-[11px] text-gray-600 px-1" title="Color de texto">
          <span className="font-bold text-sm leading-none">A</span>
          <select
            className="bg-transparent text-xs border-0 focus:ring-0 cursor-pointer max-w-[88px]"
            defaultValue="#111827"
            onMouseDown={(e) => e.stopPropagation()}
            onChange={(e) =>
              apply(() => run('foreColor', e.target.value))
            }
          >
            {TEXT_COLORS.map((c) => (
              <option key={c.value} value={c.value}>
                {c.label}
              </option>
            ))}
          </select>
        </label>

        <label className="inline-flex items-center gap-1 text-[11px] text-gray-600 px-1" title="Resaltado">
          <Highlighter className="w-3.5 h-3.5" />
          <select
            className="bg-transparent text-xs border-0 focus:ring-0 cursor-pointer max-w-[88px]"
            defaultValue="transparent"
            onMouseDown={(e) => e.stopPropagation()}
            onChange={(e) =>
              apply(() => {
                // hiliteColor works in most browsers; fallback backColor
                run('hiliteColor', e.target.value);
                run('backColor', e.target.value);
              })
            }
          >
            {HIGHLIGHTS.map((c) => (
              <option key={c.value} value={c.value}>
                {c.label}
              </option>
            ))}
          </select>
        </label>

        <span className="w-px h-5 bg-gray-200 mx-1" />

        <ToolbarBtn
          title="Lista"
          onClick={() => apply(() => run('insertUnorderedList'))}
        >
          <List className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn
          title="Numerada"
          onClick={() => apply(() => run('insertOrderedList'))}
        >
          <ListOrdered className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn title="Enlace" onClick={addLink}>
          <LinkIcon className="w-3.5 h-3.5" />
        </ToolbarBtn>

        <span className="w-px h-5 bg-gray-200 mx-1" />

        <ToolbarBtn
          title="Alinear izquierda"
          onClick={() => apply(() => run('justifyLeft'))}
        >
          <AlignLeft className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn
          title="Centrar"
          onClick={() => apply(() => run('justifyCenter'))}
        >
          <AlignCenter className="w-3.5 h-3.5" />
        </ToolbarBtn>
        <ToolbarBtn
          title="Alinear derecha"
          onClick={() => apply(() => run('justifyRight'))}
        >
          <AlignRight className="w-3.5 h-3.5" />
        </ToolbarBtn>

        <ToolbarBtn
          title="Quitar formato"
          onClick={() => apply(() => run('removeFormat'))}
        >
          <RemoveFormatting className="w-3.5 h-3.5" />
        </ToolbarBtn>
      </div>

      <div
        ref={ref}
        contentEditable
        role="textbox"
        aria-multiline
        suppressContentEditableWarning
        data-placeholder={placeholder}
        onInput={emit}
        onBlur={emit}
        className="px-3 py-2.5 text-sm text-gray-900 outline-none empty:before:content-[attr(data-placeholder)] empty:before:text-gray-400 focus:bg-white [&_ul]:list-disc [&_ul]:pl-5 [&_ol]:list-decimal [&_ol]:pl-5 [&_a]:text-brand-600 [&_a]:underline"
        style={{ minHeight }}
      />
    </div>
  );
}

/** True if HTML has visible text. */
export function richTextHasContent(html: string): boolean {
  const text = html
    .replace(/<br\s*\/?>/gi, '')
    .replace(/&nbsp;/gi, ' ')
    .replace(/<[^>]+>/g, '')
    .trim();
  return text.length > 0;
}