import os from "node:os";
import { resolveLoggerBackedRuntime } from "openclaw/plugin-sdk/extension-shared";
import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
import { resolveNextcloudTalkAccount } from "./accounts.js";
import { handleNextcloudTalkInbound } from "./inbound.js";
import {
  createNextcloudTalkWebhookServer,
  processNextcloudTalkReplayGuardedMessage,
} from "./monitor.js";
import { createNextcloudTalkReplayGuard } from "./replay-guard.js";
import { getNextcloudTalkRuntime } from "./runtime.js";
import type { CoreConfig, NextcloudTalkInboundMessage } from "./types.js";

const DEFAULT_WEBHOOK_PORT = 8788;
const DEFAULT_WEBHOOK_HOST = "0.0.0.0";
const DEFAULT_WEBHOOK_PATH = "/nextcloud-talk-webhook";

function normalizeOrigin(value: string): string | null {
  try {
    return normalizeLowercaseStringOrEmpty(new URL(value).origin);
  } catch {
    return null;
  }
}

export type NextcloudTalkMonitorOptions = {
  accountId?: string;
  config?: CoreConfig;
  runtime?: RuntimeEnv;
  abortSignal?: AbortSignal;
  onMessage?: (message: NextcloudTalkInboundMessage) => void | Promise<void>;
  statusSink?: (patch: { lastInboundAt?: number; lastOutboundAt?: number }) => void;
};

export async function monitorNextcloudTalkProvider(
  opts: NextcloudTalkMonitorOptions,
): Promise<{ stop: () => void }> {
  const core = getNextcloudTalkRuntime();
  const cfg = opts.config ?? (core.config.loadConfig() as CoreConfig);
  const account = resolveNextcloudTalkAccount({
    cfg,
    accountId: opts.accountId,
  });
  const runtime: RuntimeEnv = resolveLoggerBackedRuntime(
    opts.runtime,
    core.logging.getChildLogger(),
  );

  if (!account.secret) {
    throw new Error(`Nextcloud Talk bot secret not configured for account "${account.accountId}"`);
  }

  const port = account.config.webhookPort ?? DEFAULT_WEBHOOK_PORT;
  const host = account.config.webhookHost ?? DEFAULT_WEBHOOK_HOST;
  const path = account.config.webhookPath ?? DEFAULT_WEBHOOK_PATH;

  const logger = core.logging.getChildLogger({
    channel: "nextcloud-talk",
    accountId: account.accountId,
  });
  const expectedBackendOrigin = normalizeOrigin(account.baseUrl);
  const replayGuard = createNextcloudTalkReplayGuard({
    stateDir: core.state.resolveStateDir(process.env, os.homedir),
    onDiskError: (error) => {
      logger.warn(
        `[nextcloud-talk:${account.accountId}] replay guard disk error: ${String(error)}`,
      );
    },
  });

  const { start, stop } = createNextcloudTalkWebhookServer({
    port,
    host,
    path,
    secret: account.secret,
    isBackendAllowed: (backend) => {
      if (!expectedBackendOrigin) {
        return true;
      }
      const backendOrigin = normalizeOrigin(backend);
      return backendOrigin === expectedBackendOrigin;
    },
    processMessage: async (message) => {
      const result = await processNextcloudTalkReplayGuardedMessage({
        replayGuard,
        accountId: account.accountId,
        message,
        handleMessage: async () => {
          core.channel.activity.record({
            channel: "nextcloud-talk",
            accountId: account.accountId,
            direction: "inbound",
            at: message.timestamp,
          });
          if (opts.onMessage) {
            await opts.onMessage(message);
          } else {
            await handleNextcloudTalkInbound({
              message,
              account,
              config: cfg,
              runtime,
              statusSink: opts.statusSink,
            });
          }
        },
      });
      if (result === "duplicate") {
        logger.warn(
          `[nextcloud-talk:${account.accountId}] replayed webhook ignored room=${message.roomToken} messageId=${message.messageId}`,
        );
        return;
      }
    },
    onMessage: async () => {},
    onError: (error) => {
      logger.error(`[nextcloud-talk:${account.accountId}] webhook error: ${error.message}`);
    },
    abortSignal: opts.abortSignal,
  });

  if (opts.abortSignal?.aborted) {
    return { stop };
  }
  await start();
  if (opts.abortSignal?.aborted) {
    stop();
    return { stop };
  }

  const publicUrl =
    account.config.webhookPublicUrl ??
    `http://${host === "0.0.0.0" ? "localhost" : host}:${port}${path}`;
  logger.info(`[nextcloud-talk:${account.accountId}] webhook listening on ${publicUrl}`);

  return { stop };
}