export interface Tag {
  id: string;
  name: string;
}

export interface Item {
  id: string;
  name: string;
  tags: Tag[];
}

const API_BASE = "http://localhost:8000"; // ggf. anpassen

export async function getSeed() {
  return fetch(`${API_BASE}/dev/seed`).then(res => res.json());
}

export async function getTrips() {
  return fetch(`${API_BASE}/trips/`).then(res => res.json());
}

export async function getTripItems(tripId: string) {
  return fetch(`${API_BASE}/trip-items/by-trip/${tripId}`).then(res => res.json());
}

export async function toggleTripItem(tripItemId: string) {
  return fetch(`${API_BASE}/trip-items/${tripItemId}/toggle`, { method: 'POST' }).then(res => res.json());
}


export async function getItems(): Promise<Item[]> {
  const res = await fetch(`${API_BASE}/items/`);
  if (!res.ok) throw new Error("Failed to fetch items");
  return res.json();
}

export async function getTags(): Promise<Tag[]> {
  const res = await fetch(`${API_BASE}/tags/`);
  if (!res.ok) throw new Error("Failed to fetch tags");
  return res.json();
}

export async function updateItemName(itemId: string, name: string): Promise<Item> {
  const res = await fetch(`${API_BASE}/items/${itemId}`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ name }),
  });
  if (!res.ok) throw new Error("Failed to update item");
  return res.json();
}

export async function deleteItem(itemId: string): Promise<void> {
  const res = await fetch(`${API_BASE}/items/${itemId}`, { method: "DELETE" });
  if (!res.ok) throw new Error("Failed to delete item");
}

export async function deleteItemTag(itemId: string, tagId: string): Promise<Item> {
  const res = await fetch(`${API_BASE}/items/${itemId}/tags/${tagId}`, {
    method: "DELETE",
  });
  if (!res.ok) throw new Error("Failed to delete tag from item");
  return res.json();
}

export async function addItemTag(itemId: string, tagId: string): Promise<Item> {
  const res = await fetch(`${API_BASE}/items/${itemId}/tags`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ tag_id: tagId }),
  });
  if (!res.ok) throw new Error("Failed to add tag to item");
  return res.json();
}

export async function createItem(name: string, tags: string[]): Promise<Item> {
  const res = await fetch(`${API_BASE}/items/`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ name, tags }),
  });
  if (!res.ok) throw new Error("Failed to create item");
  return res.json();
}

export async function getNextTripId(): Promise<string> {
  const res = await fetch(`${API_BASE}/trips/next-id`);
  if (!res.ok) throw new Error("No upcoming trip found");
  return res.json();
}

export async function deleteTrip(tripId: string): Promise<void> {
  const res = await fetch(`${API_BASE}/trips/${tripId}`, { method: "DELETE" });
  if (!res.ok) throw new Error("Failed to delete trip");
}

export async function createTrip(data: {
  name: string;
  start_date: string;
  end_date: string;
  selected_tag_ids?: string[];
  marked_tag_ids?: string[];
}): Promise<any> {
  const res = await fetch(`${API_BASE}/trips/`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(data),
  });
  if (!res.ok) throw new Error("Failed to create trip");
  return res.json();
}

export async function updateTrip(
  tripId: string,
  data: {
    name: string;
    start_date: string;
    end_date: string;
    selected_tag_ids: string[];
    marked_tag_ids: string[];
  }
): Promise<any> {
  const res = await fetch(`${API_BASE}/trips/${tripId}/reconfigure`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(data),
  });
  if (!res.ok) throw new Error("Failed to update trip");
  return res.json();
}