"use client";

import { ArrowTopRightOnSquareIcon, MapPinIcon, PlusIcon, StarIcon, TrashIcon } from "@heroicons/react/24/outline";
import { useMemo, useState } from "react";
import { FormField, inputClassName } from "@/app/_components/form-field";
import { uid } from "@/lib/hellth-data";
import { trpc } from "@/lib/trpc";

type DepartmentDraft = {
  id: string;
  name: string;
  sortOrder: number;
};

type StoreDraft = {
  id?: string;
  name: string;
  address?: string | null;
  placeId?: string | null;
  latitude?: number | null;
  longitude?: number | null;
  favorite: boolean;
  departments: DepartmentDraft[];
};

function defaultDepartments(storeId: string): DepartmentDraft[] {
  return [
    { id: `${storeId}-produce`, name: "Obst & Gemüse", sortOrder: 1 },
    { id: `${storeId}-bakery`, name: "Brot & Backwaren", sortOrder: 2 },
    { id: `${storeId}-dairy`, name: "Milchprodukte", sortOrder: 3 },
    { id: `${storeId}-protein`, name: "Fleisch/Fisch/Protein", sortOrder: 4 },
    { id: `${storeId}-drinks`, name: "Getränke", sortOrder: 5 },
    { id: `${storeId}-other`, name: "Sonstiges", sortOrder: 99 },
  ];
}

function mapsSearchUrl(name: string, address?: string | null) {
  return `https://www.google.com/maps/search/?api=1&query=${encodeURIComponent([name, address].filter(Boolean).join(" "))}`;
}

export default function MaerktePage() {
  const utils = trpc.useUtils();
  const [storeName, setStoreName] = useState("");
  const [storeAddress, setStoreAddress] = useState("");
  const [storeLat, setStoreLat] = useState("");
  const [storeLng, setStoreLng] = useState("");
  const [departmentNames, setDepartmentNames] = useState<Record<string, string>>({});
  const [changeNotes, setChangeNotes] = useState<Record<string, string>>({});
  const [status, setStatus] = useState<string | null>(null);

  const storesQuery = trpc.health.listStores.useQuery();
  const requestsQuery = trpc.health.myStoreChangeRequests.useQuery();
  const saveStoreMutation = trpc.health.saveStore.useMutation({
    onSuccess: async () => {
      await utils.health.listStores.invalidate();
      setStatus("Markt gespeichert.");
    },
  });
  const submitStoreChangeRequest = trpc.health.submitStoreChangeRequest.useMutation({
    onSuccess: async () => {
      await utils.health.myStoreChangeRequests.invalidate();
      setStatus("Änderungsantrag eingereicht.");
    },
  });
  const setStoreFavoriteMutation = trpc.health.setStoreFavorite.useMutation({
    onSuccess: () => utils.health.listStores.invalidate(),
  });
  const deleteStoreMutation = trpc.health.deleteStore.useMutation({
    onSuccess: () => utils.health.listStores.invalidate(),
  });

  const stores = useMemo(() => storesQuery.data ?? [], [storesQuery.data]);

  function saveDraft(draft: StoreDraft) {
    saveStoreMutation.mutate({
      id: draft.id,
      name: draft.name,
      address: draft.address || null,
      placeId: draft.placeId || null,
      latitude: draft.latitude ?? null,
      longitude: draft.longitude ?? null,
      favorite: draft.favorite,
      departments: draft.departments
        .map((department, index) => ({
          id: department.id,
          name: department.name,
          sortOrder: department.sortOrder || index + 1,
        }))
        .sort((a, b) => a.sortOrder - b.sortOrder),
    });
  }

  function addStore() {
    if (!storeName.trim()) return;
    const storeId = uid("store");
    saveDraft({
      id: storeId,
      name: storeName.trim(),
      address: storeAddress.trim() || null,
      latitude: storeLat ? Number(storeLat.replace(",", ".")) : null,
      longitude: storeLng ? Number(storeLng.replace(",", ".")) : null,
      favorite: false,
      departments: defaultDepartments(storeId),
    });
    setStoreName("");
    setStoreAddress("");
    setStoreLat("");
    setStoreLng("");
  }

  function useCurrentLocation() {
    if (!navigator.geolocation) {
      setStatus("Standortfreigabe ist in diesem Browser nicht verfügbar.");
      return;
    }
    navigator.geolocation.getCurrentPosition(
      (position) => {
        setStoreLat(position.coords.latitude.toFixed(6));
        setStoreLng(position.coords.longitude.toFixed(6));
        setStatus("Standort übernommen. Bitte Marktname und Adresse ergänzen.");
      },
      () => setStatus("Standort konnte nicht gelesen werden."),
      { enableHighAccuracy: true, timeout: 10000 },
    );
  }

  function toggleFavorite(store: StoreDraft) {
    if (!store.id) return;
    setStoreFavoriteMutation.mutate({ storeId: store.id, favorite: !store.favorite });
  }

  function submitChange(store: StoreDraft, requestType: "new_store" | "structure_update" | "location_update" = "structure_update") {
    submitStoreChangeRequest.mutate({
      storeId: store.id ?? null,
      requestType,
      title: `${store.name}: Änderung übernehmen`,
      note: changeNotes[store.id ?? store.name] || null,
      store: {
        name: store.name,
        address: store.address ?? null,
        placeId: store.placeId ?? null,
        latitude: store.latitude ?? null,
        longitude: store.longitude ?? null,
      },
      departments: store.departments,
    });
  }

  function addDepartment(store: StoreDraft) {
    const name = departmentNames[store.id ?? store.name]?.trim();
    if (!name) return;
    const maxOrder = Math.max(0, ...store.departments.map((department) => department.sortOrder));
    saveDraft({
      ...store,
      departments: [
        ...store.departments,
        { id: uid(`${store.id ?? "store"}-dept`), name, sortOrder: maxOrder + 1 },
      ],
    });
    setDepartmentNames((current) => ({ ...current, [store.id ?? store.name]: "" }));
  }

  function removeDepartment(store: StoreDraft, departmentId: string) {
    if (store.departments.length <= 1) return;
    saveDraft({ ...store, departments: store.departments.filter((department) => department.id !== departmentId) });
  }

  function moveDepartment(store: StoreDraft, departmentId: string, direction: -1 | 1) {
    const sorted = [...store.departments].sort((a, b) => a.sortOrder - b.sortOrder);
    const index = sorted.findIndex((department) => department.id === departmentId);
    const targetIndex = index + direction;
    if (index < 0 || targetIndex < 0 || targetIndex >= sorted.length) return;
    const current = sorted[index]!;
    const target = sorted[targetIndex]!;
    sorted[index] = { ...current, sortOrder: target.sortOrder };
    sorted[targetIndex] = { ...target, sortOrder: current.sortOrder };
    saveDraft({ ...store, departments: sorted });
  }

  return (
    <div className="mx-auto max-w-6xl space-y-5 pb-24">
      <header className="rounded-[2rem] bg-white p-6 shadow-sm ring-1 ring-gray-100">
        <p className="text-sm font-black uppercase text-[#0F766E]">Einkaufen</p>
        <h1 className="mt-2 text-4xl font-black tracking-normal text-gray-950">Märkte & Laufwege</h1>
        <p className="mt-2 max-w-2xl text-sm font-semibold text-gray-400">
          Speichere nahe Lebensmittelläden, pinne ihren Standort und sortiere die Abteilungen so, wie du wirklich durch den Markt läufst.
        </p>
      </header>

      <section className="rounded-[2rem] bg-white p-5 shadow-sm ring-1 ring-gray-100">
        <div className="grid gap-3 lg:grid-cols-[1fr_1.4fr_120px_120px_130px]">
          <FormField label="Marktname">
            <input value={storeName} onChange={(event) => setStoreName(event.target.value)} placeholder="z. B. Kaufland" className={inputClassName} />
          </FormField>
          <FormField label="Adresse">
            <input value={storeAddress} onChange={(event) => setStoreAddress(event.target.value)} placeholder="Straße, Ort" className={inputClassName} />
          </FormField>
          <FormField label="Breite">
            <input value={storeLat} onChange={(event) => setStoreLat(event.target.value)} placeholder="48.3705" className={inputClassName} />
          </FormField>
          <FormField label="Länge">
            <input value={storeLng} onChange={(event) => setStoreLng(event.target.value)} placeholder="10.8978" className={inputClassName} />
          </FormField>
          <div className="flex items-end gap-2">
            <button type="button" onClick={useCurrentLocation} className="grid h-12 w-12 place-items-center rounded-2xl bg-gray-100 text-gray-700" aria-label="Standort übernehmen" title="Standort übernehmen">
              <MapPinIcon className="h-5 w-5" />
            </button>
            <button type="button" onClick={addStore} className="grid h-12 w-12 place-items-center rounded-2xl bg-gray-950 text-white" aria-label="Markt speichern" title="Markt speichern">
              <PlusIcon className="h-5 w-5" />
            </button>
          </div>
        </div>
        <div className="mt-3">
          <a href={mapsSearchUrl(storeName || "Supermarkt", storeAddress)} target="_blank" rel="noreferrer" className="inline-flex items-center gap-2 rounded-full bg-teal-50 px-4 py-2 text-xs font-black text-[#0F766E]">
            <ArrowTopRightOnSquareIcon className="h-4 w-4" />
            In Google Maps suchen
          </a>
        </div>
      </section>

      <div className="grid gap-4 lg:grid-cols-2">
        {stores.map((store) => {
          const canEdit = store.ownerUserId !== null;
          const draft: StoreDraft = {
            id: store.id,
            name: store.name,
            address: store.address,
            placeId: store.placeId,
            latitude: store.latitude,
            longitude: store.longitude,
            favorite: store.favorite,
            departments: store.departments.map((department) => ({
              id: department.id,
              name: department.name,
              sortOrder: department.sortOrder,
            })),
          };
          const departmentKey = store.id;
          return (
            <section key={store.id} className="rounded-[2rem] bg-white p-5 shadow-sm ring-1 ring-gray-100">
              <div className="flex items-start justify-between gap-3">
                <div>
                  <h2 className="text-2xl font-black text-gray-950">{store.name}</h2>
                  <p className="text-sm font-bold text-gray-400">
                    {store.departments.length} Abteilungen
                    {!canEdit ? " · globale Vorlage" : " · eigener Markt"}
                  </p>
                  {store.address ? <p className="mt-1 text-sm font-bold text-gray-500">{store.address}</p> : null}
                  {store.latitude != null && store.longitude != null ? (
                    <a href={`https://www.google.com/maps/search/?api=1&query=${store.latitude},${store.longitude}`} target="_blank" rel="noreferrer" className="mt-2 inline-flex items-center gap-1 text-xs font-black text-[#0F766E]">
                      <MapPinIcon className="h-4 w-4" />
                      Pin öffnen
                    </a>
                  ) : null}
                </div>
                <div className="flex items-center gap-2">
                  <button type="button" onClick={() => toggleFavorite(draft)} className={`rounded-full p-2 ${store.favorite ? "bg-amber-100 text-amber-600" : "bg-gray-100 text-gray-300"}`} aria-label="Favorit" title="Favorit">
                    <StarIcon className="h-5 w-5" />
                  </button>
                  {canEdit ? (
                    <button type="button" onClick={() => deleteStoreMutation.mutate({ id: store.id })} className="rounded-full p-2 text-red-500 hover:bg-red-50" aria-label="Markt löschen" title="Markt löschen">
                      <TrashIcon className="h-5 w-5" />
                    </button>
                  ) : null}
                </div>
              </div>

              <div className="mt-5 space-y-2">
                {[...store.departments].sort((a, b) => a.sortOrder - b.sortOrder).map((department, index) => (
                  <div key={department.id} className="grid grid-cols-[40px_1fr_96px_40px] items-center gap-2 rounded-2xl bg-gray-50 px-3 py-2">
                    <span className="grid h-8 w-8 place-items-center rounded-full bg-white text-sm font-black text-gray-400">{index + 1}</span>
                    <span className="text-sm font-black text-gray-950">{department.name}</span>
                    <div className="flex gap-1">
                      {canEdit ? (
                        <>
                          <button type="button" onClick={() => moveDepartment(draft, department.id, -1)} className="rounded-full bg-white px-2 py-1 text-xs font-black text-gray-500">hoch</button>
                          <button type="button" onClick={() => moveDepartment(draft, department.id, 1)} className="rounded-full bg-white px-2 py-1 text-xs font-black text-gray-500">runter</button>
                        </>
                      ) : null}
                    </div>
                    {canEdit ? (
                      <button type="button" onClick={() => removeDepartment(draft, department.id)} className="rounded-full p-2 text-red-500 hover:bg-red-50" aria-label="Abteilung löschen" title="Abteilung löschen">
                        <TrashIcon className="h-4 w-4" />
                      </button>
                    ) : <span />}
                  </div>
                ))}
              </div>

              {canEdit ? (
                <div className="mt-4 grid grid-cols-[1fr_44px] gap-2">
                  <input
                    value={departmentNames[departmentKey] ?? ""}
                    onChange={(event) => setDepartmentNames((current) => ({ ...current, [departmentKey]: event.target.value }))}
                    placeholder="Neue Abteilung"
                    className={inputClassName}
                  />
                  <button type="button" onClick={() => addDepartment(draft)} className="grid place-items-center rounded-2xl bg-gray-950 text-white" aria-label="Abteilung hinzufügen" title="Abteilung hinzufügen">
                    <PlusIcon className="h-5 w-5" />
                  </button>
                </div>
              ) : null}

              <div className="mt-4 rounded-3xl bg-gray-50 p-4">
                <FormField label="Änderung einreichen" hint={canEdit ? "Eigene Märkte können vom Admin als globale Vorlage übernommen werden." : "Globale Vorlagen werden nach Admin-Prüfung aktualisiert."}>
                  <textarea value={changeNotes[departmentKey] ?? ""} onChange={(event) => setChangeNotes((current) => ({ ...current, [departmentKey]: event.target.value }))} placeholder="Was hat sich im Markt geändert?" className={`${inputClassName} min-h-20`} />
                </FormField>
                <button type="button" onClick={() => submitChange(draft)} className="mt-3 w-full rounded-full bg-[#0F766E] px-4 py-3 text-sm font-black text-white">
                  Änderung zur Prüfung einreichen
                </button>
              </div>
            </section>
          );
        })}
      </div>

      <section className="rounded-[2rem] bg-white p-5 shadow-sm ring-1 ring-gray-100">
        <h2 className="text-xl font-black text-gray-950">Meine Änderungsanträge</h2>
        <div className="mt-3 grid gap-2">
          {(requestsQuery.data ?? []).slice(0, 8).map((request) => (
            <div key={request.id} className="flex items-center justify-between gap-3 rounded-2xl bg-gray-50 px-4 py-3 text-sm font-bold">
              <span className="min-w-0 truncate text-gray-950">{request.title}</span>
              <span className={`rounded-full px-3 py-1 text-xs ${request.status === "accepted" ? "bg-emerald-100 text-emerald-700" : request.status === "rejected" ? "bg-red-100 text-red-700" : "bg-amber-100 text-amber-700"}`}>
                {request.status === "accepted" ? "übernommen" : request.status === "rejected" ? "abgelehnt" : "in Prüfung"}
              </span>
            </div>
          ))}
          {!(requestsQuery.data ?? []).length ? <p className="text-sm font-bold text-gray-400">Noch keine Änderungsanträge.</p> : null}
        </div>
      </section>

      {status ? <div className="rounded-3xl bg-emerald-50 px-5 py-4 text-sm font-bold text-emerald-800">{status}</div> : null}
    </div>
  );
}