import { useEffect, useState } from 'react';
import { Send, Pencil, Trash2, Save, X } from 'lucide-react';
import { useUi } from '../context/ui-context.jsx';
import { useAuth } from '../context/auth-context.jsx';
import { useAsync, useAction } from '../hooks/useAsync.js';
import { listComments, createComment, updateComment, deleteComment } from '../services/comments.js';
import { Button } from './Button.jsx';
import { useDraftForm, useUserDrafts } from '../hooks/useDraftForm.js';

const MANAGE_ROLES = ['superadmin', 'admin'];

export function CommentsPanel({ entityType, entityId, onChanged }) {
  const { t, openDialog } = useUi();
  const { user: currentUser } = useAuth();
  const runAction = useAction();
  const { data: comments, reload } = useAsync(() => listComments(entityType, entityId), [entityType, entityId]);
  const [editingId, setEditingId] = useState(null);
  // Borradores: comentario nuevo (por entidad) y edicion de un comentario existente.
  const scope = `${entityType}-${entityId}`;
  const newDraft = useDraftForm({ formId: 'comment-new', entityId: scope, initial: { message: '' }, label: t('comment_placeholder') });
  const message = newDraft.values.message;
  const setMessage = (v) => newDraft.setField('message', v);
  const editingComment = (comments || []).find((c) => c.id === editingId);
  const editDraft = useDraftForm({
    formId: 'comment-edit', entityId: editingId, initial: { message: editingComment?.message || '', editVersion: editingComment?.edit_version },
    label: `${t('common_edit')}: ${(editingComment?.message || '').slice(0, 40)}`, enabled: !!editingComment, onDiscard: () => setEditingId(null),
  });
  const editingText = editDraft.values.message;
  const setEditingText = (v) => editDraft.setField('message', v);
  // Al volver con un borrador de edicion de un comentario de esta entidad, se reabre la edicion.
  const drafts = useUserDrafts();
  useEffect(() => {
    if (!comments || editingId) return;
    const d = drafts.find((x) => x.formId === 'comment-edit' && comments.some((c) => String(c.id) === String(x.entityId)));
    if (d) {
      setEditingId(Number(d.entityId));
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [comments]);

  async function send() {
    if (!message.trim()) return;
    await runAction(async () => {
      await createComment(entityType, entityId, message.trim());
      newDraft.clear();
      await reload();
      onChanged?.(); // refresca el contador de la pestaña "Comentarios" en el padre
    });
  }

  function canManage(c) {
    return c.user_id === currentUser?.id || MANAGE_ROLES.includes(currentUser?.roleCode);
  }

  function startEdit(c) {
    setEditingId(c.id);
  }

  function cancelEdit() {
    editDraft.discard();
    setEditingId(null);
  }

  async function saveEdit(id) {
    if (!editingText.trim()) return;
    await editDraft.guardSave(() => runAction(async () => {
      await updateComment(id, editingText.trim(), editDraft.values.editVersion);
      editDraft.clear();
      setEditingId(null);
      await reload();
    }));
  }

  function confirmDelete(c) {
    openDialog({
      tone: 'warning',
      title: t('common_confirm_delete_title'),
      message: t('common_confirm_delete_msg'),
      actions: [
        { label: t('common_cancel'), variant: 'standard' },
        {
          label: t('common_delete'), variant: 'danger',
          onClick: () => runAction(async () => {
            await deleteComment(c.id);
            await reload();
            onChanged?.();
          }),
        },
      ],
    });
  }

  if (!comments) return <div className="text-muted">{t('common_loading')}</div>;

  return (
    <div>
      {comments.length === 0 && <div className="text-muted" style={{ marginBottom: 12 }}>{t('common_empty')}</div>}
      {comments.map((c) => (
        <div key={c.id} style={{ padding: '8px 0', borderBottom: '1px solid rgb(var(--line) / .5)' }}>
          <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
            <div style={{ fontSize: '.78rem', fontWeight: 700, flex: 1 }}>
              {c.user_name} <span className="text-muted" style={{ fontWeight: 400 }}>· {c.created_at}{c.updated_at !== c.created_at ? ` · ${t('notes_updated')}` : ''}</span>
            </div>
            {editingId !== c.id && canManage(c) && (
              <>
                <button className="icon-btn" title={t('common_edit')} onClick={() => startEdit(c)}><Pencil size={14} /></button>
                <button className="icon-btn" title={t('common_delete')} onClick={() => confirmDelete(c)}><Trash2 size={14} /></button>
              </>
            )}
          </div>
          {editingId === c.id ? (
            <div style={{ marginTop: 6 }}>
              <input
                className={`input ${editDraft.isDirty ? 'input-dirty' : ''}`} value={editingText} autoFocus
                aria-label={editDraft.isDirty ? `${t('common_edit')} (${t('draft_field_modified')})` : t('common_edit')}
                onChange={(e) => setEditingText(e.target.value)}
                onKeyDown={(e) => { if (e.key === 'Enter') saveEdit(c.id); if (e.key === 'Escape') cancelEdit(); }}
              />
              <div style={{ display: 'flex', gap: 6, marginTop: 6 }}>
                <Button variant="accent" size="sm" icon={Save} onClick={() => saveEdit(c.id)}>{t('common_save')}</Button>
                <Button variant="standard" size="sm" icon={X} onClick={cancelEdit}>{t('common_cancel')}</Button>
              </div>
            </div>
          ) : (
            <div style={{ fontSize: '.82rem', marginTop: 2 }}>{c.message}</div>
          )}
        </div>
      ))}
      <div style={{ display: 'flex', gap: 8, marginTop: 12 }}>
        <input
          className={`input ${newDraft.isDirty ? 'input-dirty' : ''}`} value={message} placeholder={t('comment_placeholder')}
          aria-label={newDraft.isDirty ? `${t('comment_placeholder')} (${t('draft_field_modified')})` : t('comment_placeholder')}
          onChange={(e) => setMessage(e.target.value)} onKeyDown={(e) => e.key === 'Enter' && send()}
        />
        <Button variant="accent" icon={Send} onClick={send}>{t('comment_send')}</Button>
      </div>
    </div>
  );
}