import { readFileSync } from "node:fs";

import type { RuntimeEnv } from "clawdbot/plugin-sdk";

import type { ResolvedNextcloudTalkAccount } from "./accounts.js";

const ROOM_CACHE_TTL_MS = 5 * 60 * 1000;
const ROOM_CACHE_ERROR_TTL_MS = 30 * 1000;

const roomCache = new Map<
  string,
  { kind?: "direct" | "group"; fetchedAt: number; error?: string }
>();

function resolveRoomCacheKey(params: { accountId: string; roomToken: string }) {
  return `${params.accountId}:${params.roomToken}`;
}

function readApiPassword(params: {
  apiPassword?: string;
  apiPasswordFile?: string;
}): string | undefined {
  if (params.apiPassword?.trim()) return params.apiPassword.trim();
  if (!params.apiPasswordFile) return undefined;
  try {
    const value = readFileSync(params.apiPasswordFile, "utf-8").trim();
    return value || undefined;
  } catch {
    return undefined;
  }
}

function coerceRoomType(value: unknown): number | undefined {
  if (typeof value === "number" && Number.isFinite(value)) return value;
  if (typeof value === "string" && value.trim()) {
    const parsed = Number.parseInt(value, 10);
    return Number.isFinite(parsed) ? parsed : undefined;
  }
  return undefined;
}

function resolveRoomKindFromType(type: number | undefined): "direct" | "group" | undefined {
  if (!type) return undefined;
  if (type === 1 || type === 5 || type === 6) return "direct";
  return "group";
}

export async function resolveNextcloudTalkRoomKind(params: {
  account: ResolvedNextcloudTalkAccount;
  roomToken: string;
  runtime?: RuntimeEnv;
}): Promise<"direct" | "group" | undefined> {
  const { account, roomToken, runtime } = params;
  const key = resolveRoomCacheKey({ accountId: account.accountId, roomToken });
  const cached = roomCache.get(key);
  if (cached) {
    const age = Date.now() - cached.fetchedAt;
    if (cached.kind && age < ROOM_CACHE_TTL_MS) return cached.kind;
    if (cached.error && age < ROOM_CACHE_ERROR_TTL_MS) return undefined;
  }

  const apiUser = account.config.apiUser?.trim();
  const apiPassword = readApiPassword({
    apiPassword: account.config.apiPassword,
    apiPasswordFile: account.config.apiPasswordFile,
  });
  if (!apiUser || !apiPassword) return undefined;

  const baseUrl = account.baseUrl?.trim();
  if (!baseUrl) return undefined;

  const url = `${baseUrl}/ocs/v2.php/apps/spreed/api/v4/room/${roomToken}`;
  const auth = Buffer.from(`${apiUser}:${apiPassword}`, "utf-8").toString("base64");

  try {
    const response = await fetch(url, {
      method: "GET",
      headers: {
        Authorization: `Basic ${auth}`,
        "OCS-APIRequest": "true",
        Accept: "application/json",
      },
    });

    if (!response.ok) {
      roomCache.set(key, {
        fetchedAt: Date.now(),
        error: `status:${response.status}`,
      });
      runtime?.log?.(
        `nextcloud-talk: room lookup failed (${response.status}) token=${roomToken}`,
      );
      return undefined;
    }

    const payload = (await response.json()) as {
      ocs?: { data?: { type?: number | string } };
    };
    const type = coerceRoomType(payload.ocs?.data?.type);
    const kind = resolveRoomKindFromType(type);
    roomCache.set(key, { fetchedAt: Date.now(), kind });
    return kind;
  } catch (err) {
    roomCache.set(key, {
      fetchedAt: Date.now(),
      error: err instanceof Error ? err.message : String(err),
    });
    runtime?.error?.(`nextcloud-talk: room lookup error: ${String(err)}`);
    return undefined;
  }
}