"use server";

import { revalidatePath } from "next/cache";
import { z } from "zod";
import { getSessionUser } from "@/lib/auth";
import {
  addCollection,
  addTitle,
  createOrder,
  createUniverse,
  deleteOrder,
  removeTitle,
  renameOrder,
  renameUniverse,
  setOrderPositions,
  shareUniverse,
  trashUniverse,
  unshareUniverse,
  UniverseError,
} from "@/lib/universes";

/** Server-Aktionen für Universen. Zugriffsrechte prüft die Domänenschicht. */

export type UniverseActionResult = { ok: boolean; message?: string; id?: string };

async function run(
  fn: (userId: string) => Promise<{ message?: string; id?: string } | void>,
): Promise<UniverseActionResult> {
  const user = await getSessionUser();
  if (!user) return { ok: false, message: "Bitte melde dich an." };

  try {
    const result = (await fn(user.id)) ?? {};
    revalidatePath("/universen", "layout");
    revalidatePath("/", "layout");
    return { ok: true, message: result.message, id: result.id };
  } catch (error) {
    if (error instanceof UniverseError) return { ok: false, message: error.message };
    console.error("Universums-Aktion fehlgeschlagen:", error);
    return { ok: false, message: "Das hat nicht geklappt. Bitte noch einmal versuchen." };
  }
}

const id = z.string().min(1).max(64);
const name = z.string().trim().min(1).max(120);

export async function createUniverseAction(rawName: string, description?: string) {
  return run(async (userId) => {
    const universe = await createUniverse(userId, name.parse(rawName), description);
    return { message: `„${universe.name}" angelegt`, id: universe.id };
  });
}

export async function renameUniverseAction(
  universeId: string,
  data: { name?: string; description?: string | null },
) {
  return run(async (userId) => {
    await renameUniverse(userId, id.parse(universeId), {
      ...(data.name !== undefined ? { name: name.parse(data.name) } : {}),
      ...(data.description !== undefined
        ? { description: z.string().max(2000).nullable().parse(data.description) }
        : {}),
    });
    return { message: "Gespeichert" };
  });
}

export async function trashUniverseAction(universeId: string) {
  return run(async (userId) => {
    await trashUniverse(userId, id.parse(universeId));
    return { message: "Universum gelöscht" };
  });
}

export async function addTitleToUniverseAction(universeId: string, titleId: string) {
  return run(async (userId) => {
    await addTitle(userId, id.parse(universeId), id.parse(titleId));
    return { message: "Aufgenommen" };
  });
}

export async function removeFromUniverseAction(universeId: string, itemId: string) {
  return run(async (userId) => {
    await removeTitle(userId, id.parse(universeId), id.parse(itemId));
    return { message: "Aus dem Universum entfernt" };
  });
}

export async function addCollectionAction(universeId: string, tmdbCollectionId: number) {
  return run(async (userId) => {
    const added = await addCollection(
      userId,
      id.parse(universeId),
      z.number().int().parse(tmdbCollectionId),
    );
    return {
      message:
        added === 0
          ? "Alles daraus war schon drin"
          : `${added} ${added === 1 ? "Titel" : "Titel"} übernommen`,
    };
  });
}

export async function createOrderAction(universeId: string, rawName: string) {
  return run(async (userId) => {
    const order = await createOrder(userId, id.parse(universeId), name.parse(rawName));
    return { message: "Reihenfolge angelegt", id: order.id };
  });
}

export async function renameOrderAction(orderId: string, rawName: string) {
  return run(async (userId) => {
    await renameOrder(userId, id.parse(orderId), name.parse(rawName));
    return { message: "Umbenannt" };
  });
}

export async function deleteOrderAction(orderId: string) {
  return run(async (userId) => {
    await deleteOrder(userId, id.parse(orderId));
    return { message: "Reihenfolge gelöscht" };
  });
}

export async function reorderAction(orderId: string, itemIds: string[]) {
  return run(async (userId) => {
    await setOrderPositions(userId, id.parse(orderId), z.array(id).max(1000).parse(itemIds));
    return { message: "Reihenfolge gespeichert" };
  });
}

export async function shareUniverseAction(
  universeId: string,
  email: string,
  permission: "READ" | "WRITE",
) {
  return run(async (userId) => {
    const target = await shareUniverse(
      userId,
      id.parse(universeId),
      z.string().trim().email().parse(email),
      z.enum(["READ", "WRITE"]).parse(permission),
    );
    return { message: `Mit ${target.name} geteilt` };
  });
}

export async function unshareUniverseAction(universeId: string, memberId: string) {
  return run(async (userId) => {
    await unshareUniverse(userId, id.parse(universeId), id.parse(memberId));
    return { message: "Freigabe aufgehoben" };
  });
}