// src/gadget-drone.ts
// Copyright (C) 2026 Rob Colbert <rob.colbert@openplatform.us>
// Licensed under the Apache License, Version 2.0

import env from "./config/env.ts";
import assert from "node:assert";

import { io, ManagerOptions, SocketOptions, Socket } from "socket.io-client";
import { input as inqInput, password as inqPassword } from "@inquirer/prompts";

import AgentService, { IAgentWorkOrder } from "./services/agent.ts";
import AiService from "./services/ai.ts";
import PlatformService, { PlatformRegistration } from "./services/platform.ts";
import { DroneStatus } from "@gadget/api";

import { GadgetProcess } from "./lib/process.ts";
import {
  ClientToServerEvents,
  IChatSession,
  IChatTurn,
  IDroneRegistration,
  IProject,
  ProcessWorkOrderCallback,
  RequestSessionLockCallback,
  RequestWorkspaceModeCallback,
  ServerToClientEvents,
  WorkspaceMode,
} from "@gadget/api";

interface UserCredentials {
  email: string;
  password: string;
}

type ClientSocket = Socket<ServerToClientEvents, ClientToServerEvents>;

class GadgetDrone extends GadgetProcess {
  private registration: PlatformRegistration | undefined;
  private workspaceMode: WorkspaceMode = WorkspaceMode.Syncing;
  private socket: ClientSocket | undefined;
  private isShuttingDown: boolean = false;

  get name(): string {
    return "GadgetDrone";
  }

  get slug(): string {
    return "gadget-drone";
  }

  constructor() {
    super();
  }

  async start(): Promise<void> {
    /*
     * Initialize the system
     */

    this.hookProcessSignals();
    await this.startServices();

    /*
     * Register this Drone with the Gadget Code web services platform.
     */

    const credentials = await this.getUserCredentials();
    const workspaceDir = process.cwd();
    this.registration = await PlatformService.register(
      credentials.email,
      credentials.password,
      workspaceDir,
    );
    this.log.info("registered with platform", {
      registration: this.registration,
    });

    /*
     * Connect to the Gadget Code web services platform and configure the real-
     * time messaging system on Socket.IO.
     */
    await this.connectSocket();

    /*
     * Mark this Drone as available and ready to accept work orders.
     */

    await PlatformService.setStatus(DroneStatus.Available);
    this.log.info(`Gadget Drone v${env.pkg.version} started`);
  }

  async stop(): Promise<number> {
    this.log.info(`Gadget Drone v${env.pkg.version} shutting down`);

    if (this.socket) {
      this.socket.disconnect();
      delete this.socket;
    }

    await PlatformService.unregister();
    await this.stopServices();

    return 0;
  }

  async startServices(): Promise<void> {
    this.log.info("starting services");

    await AgentService.start();
    await AiService.start();
    await PlatformService.start();

    this.log.info("services started");
  }

  async stopServices(): Promise<void> {
    this.log.info("stopping services");

    await AgentService.stop();
    await AiService.stop();
    await PlatformService.stop();

    this.log.info("services stopped");
  }

  async connectSocket(): Promise<void> {
    return new Promise((resolve, reject) => {
      assert(this.registration, "must be registered with Gadget Code platform");
      const options: Partial<ManagerOptions & SocketOptions> = {
        auth: { token: this.registration._id },
        reconnectionAttempts: 10,
        timeout: 5000,
        transports: ["websocket"],
      };

      /*
       * Allow self-signed certs in non-production environments
       */
      if (env.NODE_ENV !== "production") {
        options.rejectUnauthorized = false;
      }

      this.log.debug("connecting to Gadget Code platform...");
      this.socket = io("https://code-dev.g4dge7.com:5174/", options);
      this.socket.on("connect_error", (err) => {
        this.log.error("socket connect error", { err });
        reject(err);
      });
      this.socket.on("connect", () => {
        this.log.info("connected to Gadget Code platform.");
        resolve();
      });

      this.socket.on(
        "requestSessionLock",
        this.onRequestSessionLock.bind(this),
      );
      this.socket.on(
        "requestWorkspaceMode",
        this.onRequestWorkspaceMode.bind(this),
      );
      this.socket.on("processWorkOrder", this.onProcessWorkOrder.bind(this));
    });
  }

  async onRequestSessionLock(
    registration: IDroneRegistration,
    project: IProject,
    chatSession: IChatSession,
    cb: RequestSessionLockCallback,
  ) {
    this.log.info("requestSessionLock received", {
      registration,
      project,
      chatSession,
    });
    if (!this.registration) {
      return cb(false, "not registered");
    }
    if (!registration._id.equals(this.registration._id)) {
      return cb(false, "invalid registration");
    }

    this.workspaceMode = WorkspaceMode.User;
    cb(true, chatSession._id.toHexString());
  }

  async onRequestWorkspaceMode(
    registration: IDroneRegistration,
    project: IProject,
    chatSession: IChatSession,
    mode: WorkspaceMode,
    cb: RequestWorkspaceModeCallback,
  ) {
    this.log.info("requestWorkspaceMode received", {
      registration,
      project,
      chatSession,
    });
    if (this.workspaceMode === WorkspaceMode.Idle) {
      this.workspaceMode = mode;
      return cb(true, this.workspaceMode);
    }
    return cb(false, this.workspaceMode);
  }

  async onProcessWorkOrder(
    registration: IDroneRegistration,
    project: IProject,
    chatSession: IChatSession,
    turn: IChatTurn,
    cb: ProcessWorkOrderCallback,
  ) {
    const order: IAgentWorkOrder = {
      createdAt: turn.createdAt,
      context: [],
      turn,
    };
    this.log.info("processWorkOrder received", {
      registration,
      project,
      chatSession,
      turn,
    });
    cb(true); // the drone accepts the work order

    if (!this.socket) {
      this.log.error("cannot process work order: no socket connection");
      return;
    }

    AgentService.process(order, this.socket);
  }

  hookProcessSignals(): void {
    process.title = this.name;

    process.on("unhandledRejection", async (error: Error, p) => {
      this.log.error("Unhandled rejection", {
        error,
        promise: p,
        stack: error.stack,
      });

      const exitCode = await this.stop();
      process.exit(exitCode);
    });

    process.on("warning", (error) => {
      if (error.name === "DeprecationWarning") return;
      this.log.alert("warning", { error });
    });

    process.on("SIGINT", async () => {
      this.log.info("SIGINT received");
      if (this.isShuttingDown) return;

      this.log.info("requesting shutdown");
      const exitCode = await this.stop();

      process.exit(exitCode);
    });
  }

  async getUserCredentials(): Promise<UserCredentials> {
    return {
      email: await inqInput({ message: "📧 Enter Drone Email: " }),
      password: await inqPassword({ message: "🔑 Enter Password: " }),
    };
  }
}

(async () => {
  try {
    const drone = new GadgetDrone();
    await drone.start();
  } catch (error) {
    console.error("failed to start gadget-drone", error);
    process.exit(-1);
  }
})();