import { Fragment, useMemo, useState } from 'react';
import { MoreVertical, GripVertical, ChevronRight, ChevronDown } from 'lucide-react';
import { useUi } from '../context/ui-context.jsx';
import { useDragReorder } from '../hooks/useDragReorder.js';
import { Flyout, FlyoutItem } from './Flyout.jsx';

// ListView/DataGrid: columnas ordenables, buscador ligero sobre el haystack completo, clic en
// fila abre detalle, boton "..." abre el menu de acciones (equivalente al clic derecho).
// `onReorder(idsEnNuevoOrden)` es opcional: si se pasa, habilita arrastrar filas con el mouse para
// definir un orden manual (columna con icono de agarre a la izquierda) — solo mientras no haya un
// ordenamiento por columna activo, para no mezclar los dos mecanismos de orden a la vez.
// `getChildren(fila)` es opcional: si devuelve filas, la fila se pliega/despliega con su boton o con
// un clic y las hijas se muestran debajo. Al buscar, solo quedan las hijas que coinciden y se abren.
export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowClick, rowActions, getRowKey, initialSort, onReorder, getChildren }) {
  const { t } = useUi();
  const [sort, setSort] = useState(initialSort || { key: null, dir: 1 });
  const [expanded, setExpanded] = useState(() => new Set());
  const haystack = (r) => (getSearchHaystack ? getSearchHaystack(r) : JSON.stringify(r)).toLowerCase();
  const toggleRow = (key) => setExpanded((prev) => {
    const next = new Set(prev);
    if (!next.delete(key)) next.add(key);
    return next;
  });

  const filtered = useMemo(() => {
    if (!searchValue) return rows;
    const q = searchValue.toLowerCase();
    return rows.filter((r) => haystack(r).includes(q) || getChildren?.(r)?.some((c) => haystack(c).includes(q)));
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [rows, searchValue, getSearchHaystack, getChildren]);

  const sorted = useMemo(() => {
    if (!sort.key) return filtered;
    const col = columns.find((c) => c.key === sort.key);
    return [...filtered].sort((a, b) => {
      const va = col.sortValue ? col.sortValue(a) : a[sort.key];
      const vb = col.sortValue ? col.sortValue(b) : b[sort.key];
      if (va === vb) return 0;
      return (va > vb ? 1 : -1) * sort.dir;
    });
  }, [filtered, sort, columns]);

  const dragEnabled = !!onReorder && !sort.key && !searchValue;
  const { order, getHandleProps, getRowProps, isDragging } = useDragReorder(sorted, (ids) => onReorder?.(ids), getRowKey);
  const displayRows = dragEnabled ? order : sorted;

  function toggleSort(key) {
    setSort((prev) => (prev.key === key ? { key, dir: prev.dir * -1 } : { key, dir: 1 }));
  }

  function renderRow(row, { isParent, open, onToggle, child } = {}) {
    const actions = rowActions?.(row) || [];
    const activate = isParent ? onToggle : onRowClick ? () => onRowClick(row) : null;
    return (
      <tr
        key={getRowKey(row)}
        onClick={() => activate?.()}
        onContextMenu={actions.length ? (event) => { event.preventDefault(); event.currentTarget.querySelector('.row-menu-btn')?.click(); } : undefined}
        tabIndex={activate ? 0 : undefined}
        onKeyDown={(event) => { if (activate && event.target === event.currentTarget && (event.key === 'Enter' || event.key === ' ')) { event.preventDefault(); activate(); } }}
        className={dragEnabled && isDragging(getRowKey(row)) ? 'dragging' : ''}
        {...(dragEnabled ? getRowProps(row) : {})}
      >
        {dragEnabled && (
          <td className="drag-handle-cell" onClick={(e) => e.stopPropagation()} {...getHandleProps(row)}>
            <GripVertical size={15} />
          </td>
        )}
        {columns.map((col, index) => (
          <td key={col.key} style={index === 0 && child ? { paddingLeft: 38 } : undefined}>
            {index === 0 && isParent ? (
              <span className="list-tree-cell">
                <button type="button" className="tree-toggle" aria-expanded={open} aria-label={t(open ? 'common_collapse' : 'common_expand')} onClick={(e) => { e.stopPropagation(); onToggle(); }}>
                  {open ? <ChevronDown size={14} /> : <ChevronRight size={14} />}
                </button>
                {col.render ? col.render(row) : row[col.key]}
              </span>
            ) : (col.render ? col.render(row) : row[col.key])}
          </td>
        ))}
        {rowActions && (
          <td onClick={(e) => e.stopPropagation()}>
            {actions.length > 0 && (
              <Flyout trigger={({ onClick }) => (
                <button className="icon-btn row-menu-btn" aria-label={t('common_actions')} onClick={onClick}><MoreVertical /></button>
              )}>
                {actions.map((action, i) => (
                  <FlyoutItem key={i} icon={action.icon} danger={action.danger} onClick={action.onClick}>
                    {action.label}
                  </FlyoutItem>
                ))}
              </Flyout>
            )}
          </td>
        )}
      </tr>
    );
  }

  return (
    <div className="list-card">
      <table className="list-table">
        <thead>
          <tr>
            {dragEnabled && <th style={{ width: 28 }} />}
            {columns.map((col) => (
              <th key={col.key} aria-sort={col.sortable !== false && sort.key === col.key ? (sort.dir === 1 ? 'ascending' : 'descending') : undefined}>
                {col.sortable === false ? col.label : <button type="button" className="table-sort-button" onClick={() => toggleSort(col.key)}>{col.label}{sort.key === col.key ? (sort.dir === 1 ? ' ▲' : ' ▼') : ''}</button>}
              </th>
            ))}
            {rowActions && <th style={{ width: 40 }} />}
          </tr>
        </thead>
        <tbody>
          {displayRows.map((row) => {
            const key = getRowKey(row);
            const allChildren = getChildren?.(row);
            const isParent = !!allChildren?.length;
            const q = searchValue?.toLowerCase();
            const children = isParent && q ? allChildren.filter((c) => haystack(c).includes(q)) : allChildren;
            const open = isParent && (expanded.has(key) || (!!q && children.length > 0));
            return (
              <Fragment key={key}>
                {renderRow(row, { isParent, open, onToggle: () => toggleRow(key) })}
                {open && children.map((child) => renderRow(child, { child: true }))}
              </Fragment>
            );
          })}
        </tbody>
      </table>
      {displayRows.length === 0 && <div className="list-empty">{t('common_empty')}</div>}
    </div>
  );
}