import { Instance } from "./Instance.js";
import { BO3ScriptSignal } from "../core/BO3ScriptSignal.js";

export class DebugTextService extends Instance {
  constructor() {
    super("DebugTextService");

    this.isClient = true; // Mark client-only
    this._renderService = null;
    this._networkService = null;
    this._lastBytes = 0;
    this._bps = 0;
    this._lastMeasure = performance.now();

    // Tracks text lines
    this._lines = [];

    // Hook into render loop later
  }

  OnAddedToScene(parent) {
    const dm = this.GetDataModel();

    // Get references to RenderService and NetworkService
    this._renderService = dm.GetService("RenderService");
    this._networkService = dm.GetService("NetworkService");

    if (!this._renderService) {
      console.warn("[DebugTextService] No RenderService found!");
      return;
    }

    // Initialize debug text array
    this._renderService.debugText = [];

    // Hook into RenderStepped
    this._renderService.RenderStepped.Connect((dt) => this._onRenderStep(dt));
  }

  // Called each RenderStepped frame (~60fps)
  _onRenderStep(dt) {
    this._lines.length = 0; // clear

    // === Network stats ===
    if (this._networkService) {
      const now = performance.now();
      const bytesNow = this._networkService.totalBytes || 0;
      const deltaBytes = bytesNow - this._lastBytes;
      const deltaTime = (now - this._lastMeasure) / 1000;

      if (deltaTime > 0.25) { // smooth every 250ms
        this._bps = deltaBytes / deltaTime;
        this._lastBytes = bytesNow;
        this._lastMeasure = now;
      }

      this._lines.push(
        `Net: ${(this._bps / 1024).toFixed(2)} KB/s`
      );
    }

    // === Instance tree summary ===
    const dm = this.GetDataModel();
    if (dm && dm.Children) {
      const totalInstances = this._countInstances(dm);
      this._lines.push(`Instances: ${totalInstances}`);
    }

    // === Misc stats ===
    if (this._renderService.physicsWorld) {
      const bodies = this._renderService.physicsWorld.bodies.length;
      this._lines.push(`Physics Bodies: ${bodies}`);
    }

    // === Output ===
    this._renderService.debugText.length = 0;
    this._renderService.debugText.push(...this._lines);

    // Generate instance tree (for future use)
    const instanceTree = this._generateTree(dm);
    // Push this to text overlay if needed
    this._renderService.debugText.push(...instanceTree);
  }

  _countInstances(instance) {
    let count = 1;
    if (!instance.Children) return count;
    for (const child of instance.Children) {
      count += this._countInstances(child);
    }
    return count;
  }
  _generateTree(instance, depth = 0) {
    let lines = [];
    const indent = "  ".repeat(depth);
    lines.push(`${indent}- ${instance.ClassName} (${instance.Name}) [${instance.InstanceId}]`);
    if (instance.Children) {
      for (const child of instance.Children) {
        lines.push(...this._generateTree(child, depth + 1));
      }
    }
    return lines;
  }
}
// Displays debug text overlay on screen with network and instance stats