import { prisma } from "./prisma";

export type AppSettings = {
  instanceName: string;
  instanceDescription: string;
  registrationMode: "OPEN" | "INVITE_ONLY" | "DISABLED";
  defaultRoomVisibility: "PUBLIC" | "FRIENDS" | "EXPLICIT" | "ROLE_RESTRICTED";
  allowedProviders: string[];
  maxAvatarUploadMb: number;
};

const defaults: AppSettings = {
  instanceName: "WatchLink",
  instanceDescription: "Persistent shared watch rooms for friends and teams.",
  registrationMode: "OPEN",
  defaultRoomVisibility: "FRIENDS",
  allowedProviders: ["YOUTUBE", "TWITCH", "DIRECT"],
  maxAvatarUploadMb: 2
};

export async function getAppSettings(): Promise<AppSettings> {
  const rows = await prisma.appSetting.findMany();
  const values = new Map(rows.map((row) => [row.key, row.value]));
  const registrationMode = parseChoice(values.get("registrationMode"), ["OPEN", "INVITE_ONLY", "DISABLED"], defaults.registrationMode);
  const defaultRoomVisibility = parseChoice(
    values.get("defaultRoomVisibility"),
    ["PUBLIC", "FRIENDS", "EXPLICIT", "ROLE_RESTRICTED"],
    defaults.defaultRoomVisibility
  );
  const maxAvatarUploadMb = Number(values.get("maxAvatarUploadMb") || defaults.maxAvatarUploadMb);

  return {
    instanceName: values.get("instanceName") || defaults.instanceName,
    instanceDescription: values.get("instanceDescription") || defaults.instanceDescription,
    registrationMode,
    defaultRoomVisibility,
    allowedProviders: (values.get("allowedProviders") || defaults.allowedProviders.join(","))
      .split(",")
      .map((item) => item.trim())
      .filter(Boolean),
    maxAvatarUploadMb: Number.isFinite(maxAvatarUploadMb) && maxAvatarUploadMb > 0 ? maxAvatarUploadMb : defaults.maxAvatarUploadMb
  };
}

function parseChoice<T extends string>(value: string | undefined, allowed: T[], fallback: T): T {
  return allowed.includes(value as T) ? (value as T) : fallback;
}