'use client';

import { useEffect, useRef, useState } from 'react';
import { useTranslations } from 'next-intl';
import type { DashboardTab } from '@/lib/dashboard-api';

interface DashboardTabsProps {
  dashboards: DashboardTab[];
  activeDashboardId: string | null;
  isEditMode: boolean;
  onSelect: (id: string) => void;
  onCreate: () => void;
  onRename: (id: string, name: string) => void;
  onDelete: (id: string) => void;
}

/**
 * Reiterleiste über dem Dashboard-Raster (quick-260923-ad9, Task 3).
 *
 * Klick wechselt IMMER den Reiter, unabhängig vom Bearbeitungsmodus.
 * Umbenennen (an Ort und Stelle, Eingabetaste übernimmt, Escape verwirft)
 * und Löschen (mit Rückfrage) sind nur im Bearbeitungsmodus sichtbar; der
 * Löschen-Knopf fehlt zusätzlich beim letzten verbleibenden Reiter (D-10 —
 * der Server weist das ohnehin ab, die Oberfläche bietet es gar nicht erst
 * an). Das Ziehen zum Umsortieren kommt in Task 4 hinzu (D-05, keine neue
 * Abhängigkeit — Pointer-Ereignisse wie in `xframe-config-form.tsx`).
 */
export function DashboardTabs({
  dashboards,
  activeDashboardId,
  isEditMode,
  onSelect,
  onCreate,
  onRename,
  onDelete,
}: DashboardTabsProps) {
  const t = useTranslations('widgets');
  const tCommon = useTranslations('common');
  const [renamingId, setRenamingId] = useState<string | null>(null);
  const [draftName, setDraftName] = useState('');
  const [pendingDeleteId, setPendingDeleteId] = useState<string | null>(null);
  const renameInputRef = useRef<HTMLInputElement>(null);

  // Fokus auf das Eingabefeld beim Wechsel in den Umbenennen-Zustand — ueber
  // einen Ref statt des autoFocus-Attributs (lint/a11y/noAutofocus), Muster
  // `widget-catalog-modal.tsx` (dialogRef.current?.focus()).
  useEffect(() => {
    if (renamingId) {
      renameInputRef.current?.focus();
      renameInputRef.current?.select();
    }
  }, [renamingId]);

  function startRename(tab: DashboardTab) {
    setRenamingId(tab.id);
    setDraftName(tab.name);
  }

  function commitRename() {
    const id = renamingId;
    const name = draftName.trim();
    setRenamingId(null);
    if (id && name) {
      onRename(id, name);
    }
  }

  function cancelRename() {
    setRenamingId(null);
  }

  const pendingDeleteTab = dashboards.find((d) => d.id === pendingDeleteId) ?? null;

  return (
    <nav aria-label={t('tabs.navLabel')} className="mb-2 flex items-center gap-1 overflow-x-auto">
      {dashboards.map((tab) => {
        const isActive = tab.id === activeDashboardId;
        const isRenaming = renamingId === tab.id;

        return (
          <div key={tab.id} className="flex items-center">
            {isRenaming ? (
              <input
                ref={renameInputRef}
                value={draftName}
                onChange={(e) => setDraftName(e.target.value)}
                onBlur={commitRename}
                onKeyDown={(e) => {
                  if (e.key === 'Enter') {
                    e.preventDefault();
                    commitRename();
                  } else if (e.key === 'Escape') {
                    e.preventDefault();
                    cancelRename();
                  }
                }}
                maxLength={40}
                aria-label={t('tabs.renameInputLabel')}
                className="h-8 w-32 rounded border border-border bg-background px-2 text-sm text-foreground"
              />
            ) : (
              <button
                type="button"
                onClick={() => onSelect(tab.id)}
                aria-current={isActive ? 'true' : undefined}
                className={`h-8 rounded-t px-3 text-sm font-medium transition-colors ${
                  isActive
                    ? 'border border-b-transparent border-border bg-card text-foreground'
                    : 'text-muted-foreground hover:bg-muted'
                }`}
              >
                {tab.name}
              </button>
            )}

            {isEditMode && isActive && !isRenaming && (
              <button
                type="button"
                onClick={() => startRename(tab)}
                aria-label={t('tabs.renameButtonLabel')}
                title={t('tabs.renameButtonLabel')}
                className="ml-0.5 rounded p-1 text-muted-foreground hover:bg-muted hover:text-foreground"
              >
                <svg
                  aria-hidden="true"
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  viewBox="0 0 24 24"
                  fill="none"
                  stroke="currentColor"
                  strokeWidth="2"
                  strokeLinecap="round"
                  strokeLinejoin="round"
                >
                  <path d="M17 3a2.85 2.83 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5Z" />
                </svg>
              </button>
            )}

            {isEditMode && dashboards.length > 1 && (
              <button
                type="button"
                onClick={() => setPendingDeleteId(tab.id)}
                aria-label={t('tabs.deleteButtonLabel')}
                title={t('tabs.deleteButtonLabel')}
                className="ml-0.5 rounded p-1 text-muted-foreground hover:bg-muted hover:text-destructive"
              >
                <svg
                  aria-hidden="true"
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  viewBox="0 0 24 24"
                  fill="none"
                  stroke="currentColor"
                  strokeWidth="2"
                  strokeLinecap="round"
                  strokeLinejoin="round"
                >
                  <line x1="18" y1="6" x2="6" y2="18" />
                  <line x1="6" y1="6" x2="18" y2="18" />
                </svg>
              </button>
            )}
          </div>
        );
      })}

      {isEditMode && (
        <button
          type="button"
          onClick={onCreate}
          aria-label={t('tabs.add')}
          title={t('tabs.add')}
          className="ml-1 flex h-8 w-8 items-center justify-center rounded text-muted-foreground hover:bg-muted hover:text-foreground"
        >
          <svg
            aria-hidden="true"
            xmlns="http://www.w3.org/2000/svg"
            width="16"
            height="16"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            strokeWidth="2"
            strokeLinecap="round"
            strokeLinejoin="round"
          >
            <line x1="12" y1="5" x2="12" y2="19" />
            <line x1="5" y1="12" x2="19" y2="12" />
          </svg>
        </button>
      )}

      {pendingDeleteTab && (
        <div className="fixed inset-0 z-50 flex items-center justify-center">
          <button
            type="button"
            onClick={() => setPendingDeleteId(null)}
            aria-label={tCommon('cancel')}
            className="fixed inset-0 bg-black/50"
          />
          <div
            role="alertdialog"
            aria-modal="true"
            aria-label={t('tabs.deleteDialogTitle')}
            className="relative z-50 mx-4 max-w-md rounded-lg border border-border bg-card p-6 shadow-xl"
          >
            <h3 className="mb-2 text-lg font-semibold text-foreground">
              {t('tabs.deleteDialogTitle')}
            </h3>
            <p className="mb-4 text-sm text-muted-foreground">
              {t('tabs.deleteDialogBody', { name: pendingDeleteTab.name })}
            </p>
            <div className="flex justify-end gap-3">
              <button
                type="button"
                onClick={() => setPendingDeleteId(null)}
                className="rounded border border-border px-4 py-2 text-sm text-foreground transition-colors hover:bg-muted"
              >
                {tCommon('cancel')}
              </button>
              <button
                type="button"
                onClick={() => {
                  onDelete(pendingDeleteTab.id);
                  setPendingDeleteId(null);
                }}
                className="rounded bg-destructive px-4 py-2 text-sm font-medium text-destructive-foreground transition-colors hover:bg-destructive/90"
              >
                {tCommon('delete')}
              </button>
            </div>
          </div>
        </div>
      )}
    </nav>
  );
}