import { useState } from 'react';
import { Plus, Pencil, Save, X, Trash2 } from 'lucide-react';
import { useUi } from '../../context/ui-context.jsx';
import { useAsync, useAction } from '../../hooks/useAsync.js';
import { listNotes, createNote, updateNote, deleteNote } from '../../services/notes.js';
import { Button } from '../../components/Button.jsx';

function formatDateTime(value) {
  return String(value).slice(0, 16).replace('T', ' ');
}

export default function NotasPage() {
  const { t, pushToast, openDialog } = useUi();
  const runAction = useAction();
  const { data: notes, reload } = useAsync(listNotes, []);

  const [newContent, setNewContent] = useState('');
  const [editingId, setEditingId] = useState(null);
  const [editingContent, setEditingContent] = useState('');

  async function addNote() {
    if (!newContent.trim()) return;
    await runAction(async () => {
      await createNote(newContent);
      setNewContent('');
      await reload();
    });
  }

  function startEdit(note) {
    setEditingId(note.id);
    setEditingContent(note.content);
  }

  function cancelEdit() {
    setEditingId(null);
    setEditingContent('');
  }

  async function saveEdit(id) {
    if (!editingContent.trim()) return;
    await runAction(async () => {
      await updateNote(id, editingContent);
      cancelEdit();
      await reload();
    });
  }

  function confirmDelete(note) {
    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 deleteNote(note.id);
            await reload();
            pushToast({ tone: 'success', message: t('common_saved') });
          }),
        },
      ],
    });
  }

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

  return (
    <div>
      <h2 className="page-title mt-0" style={{ marginBottom: 16 }}>{t('notes_title')}</h2>

      <div className="panel-card" style={{ marginBottom: 16 }}>
        <textarea
          className="textarea"
          rows={3}
          placeholder={t('notes_placeholder')}
          value={newContent}
          onChange={(e) => setNewContent(e.target.value)}
        />
        <div style={{ marginTop: 8 }}>
          <Button variant="accent" icon={Plus} onClick={addNote} disabled={!newContent.trim()}>
            {t('notes_add')}
          </Button>
        </div>
      </div>

      {notes.length === 0 && <div className="text-muted">{t('notes_empty')}</div>}

      {notes.map((note) => (
        <div key={note.id} className="panel-card" style={{ marginBottom: 10 }}>
          {editingId === note.id ? (
            <>
              <textarea
                className="textarea" rows={3} autoFocus
                value={editingContent}
                onChange={(e) => setEditingContent(e.target.value)}
                onKeyDown={(e) => { if (e.key === 'Escape') cancelEdit(); }}
              />
              <div style={{ display: 'flex', gap: 8, marginTop: 8 }}>
                <Button variant="accent" icon={Save} onClick={() => saveEdit(note.id)}>{t('common_save')}</Button>
                <Button variant="standard" icon={X} onClick={cancelEdit}>{t('common_cancel')}</Button>
              </div>
            </>
          ) : (
            <>
              <div style={{ fontSize: '.85rem', whiteSpace: 'pre-wrap', marginBottom: 8 }}>{note.content}</div>
              <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
                <span className="text-muted" style={{ fontSize: '.7rem' }}>
                  {note.created_at === note.updated_at
                    ? formatDateTime(note.created_at)
                    : `${t('notes_updated')} ${formatDateTime(note.updated_at)}`}
                </span>
                <div style={{ flex: 1 }} />
                <button className="icon-btn" title={t('common_edit')} onClick={() => startEdit(note)}><Pencil size={15} /></button>
                <button className="icon-btn" title={t('common_delete')} onClick={() => confirmDelete(note)}><Trash2 size={15} /></button>
              </div>
            </>
          )}
        </div>
      ))}
    </div>
  );
}