export { validateYonexusServerConfig, YonexusServerConfigError } from "./core/config.js";
export type { YonexusServerConfig } from "./core/config.js";
export {
  createClientRecord,
  serializeClientRecord,
  deserializeClientRecord,
  isPairable,
  hasPendingPairing,
  isPairingExpired,
  canAuthenticate,
  type PairingStatus,
  type ClientLivenessStatus,
  type PairingNotifyStatus,
  type NonceEntry,
  type HandshakeAttemptEntry,
  type ClientRecord,
  type ClientSession,
  type ServerRegistry,
  type SerializedClientRecord,
  type ServerPersistenceData
} from "./core/persistence.js";
export {
  SERVER_PERSISTENCE_VERSION,
  YonexusServerStoreError,
  YonexusServerStoreCorruptionError,
  createYonexusServerStore,
  loadServerStore,
  saveServerStore,
  type ServerStoreLoadResult,
  type YonexusServerStore
} from "./core/store.js";

import path from "node:path";
import fs from "node:fs";
import { validateYonexusServerConfig } from "./core/config.js";
import { createYonexusServerStore } from "./core/store.js";
import { createServerTransport } from "./core/transport.js";
import { createYonexusServerRuntime } from "./core/runtime.js";
import { createServerRuleRegistry } from "./core/rules.js";
import { encodeRuleMessage } from "../../Yonexus.Protocol/src/index.js";
import type { ServerPersistenceData } from "./core/persistence.js";

export interface YonexusServerPluginManifest {
  readonly name: "Yonexus.Server";
  readonly version: string;
  readonly description: string;
}

const manifest: YonexusServerPluginManifest = {
  name: "Yonexus.Server",
  version: "0.1.0",
  description: "Yonexus central hub plugin for cross-instance OpenClaw communication"
};

let _serverStarted = false;

export function createYonexusServerPlugin(api: {
  rootDir: string;
  pluginConfig: unknown;
  registrationMode?: string;  // "full" (gateway) | "cli-metadata" | "setup-only" | "setup-runtime"
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  registerCli?: (registrar: (ctx: { program: any }) => void, opts?: { commands?: string[] }) => void;
}): void {
  const stateFilePath = path.join(api.rootDir, "state.json");

  // Register CLI regardless of whether the gateway is already running.
  // The CLI process is a separate invocation that reads from the persisted state file.
  api.registerCli?.(({ program }) => {
    const group = program
      .command("yonexus-server")
      .description("Yonexus.Server management");

    group
      .command("pair-code <identifier>")
      .description("Show the pending pairing code for a device awaiting confirmation")
      .action((identifier: string) => {
        let raw: ServerPersistenceData;
        try {
          raw = JSON.parse(fs.readFileSync(stateFilePath, "utf8")) as ServerPersistenceData;
        } catch {
          console.error("Error: could not read server state. Is the gateway running?");
          process.exit(1);
        }

        const client = raw.clients?.find((c) => c.identifier === identifier);
        if (!client) {
          console.error(`Error: identifier "${identifier}" not found in server registry.`);
          process.exit(1);
        }
        if (client.pairingStatus !== "pending" || !client.pairingCode) {
          const status = client.pairingStatus;
          console.error(`Error: no pending pairing for "${identifier}" (status: ${status}).`);
          process.exit(1);
        }
        if (client.pairingExpiresAt && Math.floor(Date.now() / 1000) > client.pairingExpiresAt) {
          console.error(`Error: pairing for "${identifier}" has expired.`);
          process.exit(1);
        }

        const expiresIn = client.pairingExpiresAt
          ? Math.max(0, client.pairingExpiresAt - Math.floor(Date.now() / 1000))
          : 0;
        const mm = String(Math.floor(expiresIn / 60)).padStart(2, "0");
        const ss = String(expiresIn % 60).padStart(2, "0");

        console.log(`Identifier : ${client.identifier}`);
        console.log(`Pairing code : ${client.pairingCode}`);
        console.log(`Expires in : ${mm}m ${ss}s`);
      });

    group
      .command("list-pending")
      .description("List all identifiers with a pending pairing code")
      .action(() => {
        let raw: ServerPersistenceData;
        try {
          raw = JSON.parse(fs.readFileSync(stateFilePath, "utf8")) as ServerPersistenceData;
        } catch {
          console.error("Error: could not read server state. Is the gateway running?");
          process.exit(1);
        }

        const now = Math.floor(Date.now() / 1000);
        const pending = (raw.clients ?? []).filter(
          (c) => c.pairingStatus === "pending" && c.pairingCode && (!c.pairingExpiresAt || now <= c.pairingExpiresAt)
        );

        if (pending.length === 0) {
          console.log("No pending pairings.");
          return;
        }
        for (const c of pending) {
          const expiresIn = c.pairingExpiresAt ? Math.max(0, c.pairingExpiresAt - now) : 0;
          const mm = String(Math.floor(expiresIn / 60)).padStart(2, "0");
          const ss = String(expiresIn % 60).padStart(2, "0");
          console.log(`  ${c.identifier}  (expires in ${mm}m ${ss}s)`);
        }
      });
  }, { commands: ["yonexus-server"] });

  if (_serverStarted) return;
  _serverStarted = true;

  const config = validateYonexusServerConfig(api.pluginConfig);
  const store = createYonexusServerStore(stateFilePath);

  const ruleRegistry = createServerRuleRegistry();
  const onClientAuthenticatedCallbacks: Array<(identifier: string) => void> = [];

  let runtimeRef: ReturnType<typeof createYonexusServerRuntime> | null = null;
  const transport = createServerTransport({
    config,
    onMessage: (conn, msg) => {
      runtimeRef?.handleMessage(conn, msg).catch((err: unknown) => {
        console.error("[yonexus-server] message handler error:", err);
      });
    },
    onDisconnect: (identifier) => {
      if (identifier && runtimeRef) {
        runtimeRef.handleDisconnect(identifier);
      }
    }
  });

  // Expose registry and helpers for other plugins loaded in the same process
  (globalThis as Record<string, unknown>)["__yonexusServer"] = {
    ruleRegistry,
    sendRule: (identifier: string, ruleId: string, content: string): boolean =>
      transport.send(identifier, encodeRuleMessage(ruleId, content)),
    onClientAuthenticated: onClientAuthenticatedCallbacks
  };

  const runtime = createYonexusServerRuntime({
    config,
    store,
    transport,
    ruleRegistry,
    onClientAuthenticated: (identifier) => {
      for (const cb of onClientAuthenticatedCallbacks) cb(identifier);
    }
  });
  runtimeRef = runtime;

  const shutdown = (): void => {
    runtime.stop().catch((err: unknown) => {
      console.error("[yonexus-server] shutdown error:", err);
    });
  };
  process.once("SIGTERM", shutdown);
  process.once("SIGINT", shutdown);

  runtime.start().catch((err: unknown) => {
    // EADDRINUSE means the gateway is already running (e.g. this is a CLI invocation).
    // Any other error is a real problem worth logging.
    const code = (err as NodeJS.ErrnoException | undefined)?.code;
    if (code !== "EADDRINUSE") {
      console.error("[yonexus-server] failed to start:", err);
    }
  });
}

export default createYonexusServerPlugin;
export {
  createServerTransport,
  YonexusServerTransport,
  type ServerTransport,
  type ServerTransportOptions,
  type ClientConnection,
  type MessageHandler,
  type ConnectionHandler,
  type DisconnectionHandler
} from "./core/transport.js";
export {
  createYonexusServerRuntime,
  YonexusServerRuntime,
  type YonexusServerRuntimeOptions,
  type ServerLifecycleState
} from "./core/runtime.js";
export {
  createServerRuleRegistry,
  YonexusServerRuleRegistry,
  ServerRuleRegistryError,
  type ServerRuleRegistry,
  type ServerRuleProcessor
} from "./core/rules.js";

export {
  createPairingService,
  PairingService,
  type PairingRequest,
  type PairingResult,
  type PairingFailureReason
} from "./services/pairing.js";

export {
  createDiscordNotificationService,
  createMockNotificationService,
  type DiscordNotificationService,
  type DiscordNotificationConfig
} from "./notifications/discord.js";

export { manifest };