import { useEffect, useEffectEvent, useState } from 'react';

import { adminApi } from '../../../api/client';
import { wandererAdminApi } from '../../../api/wanderer';
import { useTranslation } from '../../../i18n';
import { useAddonStore } from '../../../store/addonStore';
import { useToast } from '../../shared/Toast';
import { type Addon, type ProviderOption, isPhotosAddon } from './addonModel';

/**
 * The addon switches behind both admin shells: the addon list loaded on mount, an
 * optimistic toggle with a per row rollback, and the lists each shell groups its tiles
 * and provider shelves from. The desktop columns and the phone cards render their own
 * markup over it.
 */
export function useAddonManager() {
  const { t } = useTranslation();
  const toast = useToast();
  const refreshGlobalAddons = useAddonStore((s) => s.loadAddons);
  const [addons, setAddons] = useState<Addon[]>([]);
  const [loading, setLoading] = useState(true);
  const [toursWanderer, setToursWanderer] = useState(false);

  const loadAddons = async () => {
    try {
      const data = await adminApi.addons();
      setAddons(data.addons);
    } catch {
      toast.error(t('admin.addons.toast.error'));
    }
  };

  const loadOnMount = useEffectEvent(() => {
    void loadAddons().finally(() => setLoading(false));
    wandererAdminApi
      .get()
      .then((flag) => setToursWanderer(flag.enabled))
      .catch(() => toast.error(t('admin.addons.toast.error')));
  });
  useEffect(() => {
    loadOnMount();
  }, []);

  /** Optimistic flip, per-row rollback on failure. Rolling the whole addons
   *  snapshot back instead would undo a toggle the user hit in parallel. */
  const handleToggle = async (addon: Addon) => {
    const newEnabled = !addon.enabled;
    setAddons((prev) => prev.map((a) => (a.id === addon.id ? { ...a, enabled: newEnabled } : a)));
    try {
      await adminApi.updateAddon(addon.id, { enabled: newEnabled });
    } catch {
      setAddons((prev) => prev.map((a) => (a.id === addon.id ? { ...a, enabled: !newEnabled } : a)));
      toast.error(t('admin.addons.toast.error'));
      return;
    }
    refreshGlobalAddons();
    // Journey off disables every photo provider with it, and the response carries
    // only Journey. Without re-reading, switching Journey back on brings the shelf
    // up with providers the database has long since turned off.
    // Same for Documents: switching it off disables every document provider in
    // the database, and the response carries only the addon itself.
    if (addon.id === 'journey' || addon.id === 'documents') await loadAddons();
    toast.success(t('admin.addons.toast.updated'));
  };

  /** wanderer under Tours: flipped at once, put back when the save fails. */
  const toggleToursWanderer = async () => {
    const next = !toursWanderer;
    setToursWanderer(next);
    try {
      await wandererAdminApi.update(next);
    } catch {
      setToursWanderer(!next);
      toast.error(t('admin.addons.toast.error'));
      return;
    }
    void refreshGlobalAddons();
    toast.success(t('admin.addons.toast.updated'));
  };

  const asOption = (provider: Addon): ProviderOption => ({
    key: provider.id,
    label: provider.name,
    description: provider.description,
    enabled: provider.enabled,
    toggle: () => handleToggle(provider),
  });

  const tripAddons = addons.filter((a) => a.type === 'trip' && !isPhotosAddon(a));
  const globalAddons = addons.filter((a) => a.type === 'global');
  const integrationAddons = addons.filter((a) => a.type === 'integration');
  const providerOptions = addons.filter((a) => a.type === 'photo_provider').map(asOption);
  // No credential form under these, unlike the photo providers: a document connection
  // belongs to a trip and is entered there. The admin only decides whether a provider
  // may be offered at all.
  const documentProviderOptions = addons.filter((a) => a.type === 'document_provider').map(asOption);

  return {
    addons,
    loading,
    handleToggle,
    tripAddons,
    globalAddons,
    integrationAddons,
    providerOptions,
    documentProviderOptions,
    toursWanderer,
    toggleToursWanderer,
  };
}