/**
 * Main Application Entry Point
 * Orchestrates canvas setup, simulation loop, frame timing, and UI binding.
 */

import { configManager } from './config.js';
import { Simulation } from './simulation.js';
import { UIManager } from './ui.js';

window.addEventListener('DOMContentLoaded', () => {
  const canvas = document.getElementById('simCanvas');
  const container = canvas.parentElement;

  // Determine initial container dimensions (100% of open play area)
  const initialWidth = Math.max(400, Math.floor(container.clientWidth || window.innerWidth - 330));
  const initialHeight = Math.max(300, Math.floor(container.clientHeight || window.innerHeight - 60));

  canvas.width = initialWidth;
  canvas.height = initialHeight;

  // Initialize Simulation and UI
  const sim = new Simulation(canvas, configManager.current);
  const ui = new UIManager(sim, configManager);

  // Dynamic screen resize synchronization
  function syncCanvasSize() {
    const w = Math.max(400, Math.floor(container.clientWidth));
    const h = Math.max(300, Math.floor(container.clientHeight));
    if (w > 0 && h > 0 && (canvas.width !== w || canvas.height !== h)) {
      canvas.width = w;
      canvas.height = h;
      sim.resize(w, h);
    }
  }

  window.addEventListener('resize', syncCanvasSize);
  if (window.ResizeObserver) {
    const ro = new ResizeObserver(() => syncCanvasSize());
    ro.observe(container);
  }

  // Wire simulation callbacks
  sim.onStatsChange = (stats, sheep, wolves, plants) => {
    ui.updateHUD(stats, sheep, wolves, plants);
  };

  sim.onExtinction = (stats) => {
    ui.showExtinctionModal(stats);
  };

  // Main Animation Loop
  let lastTime = performance.now();

  function loop(currentTime) {
    const rawDt = (currentTime - lastTime) / 1000.0;
    lastTime = currentTime;

    // Advance simulation step
    sim.update(rawDt);

    // Render frame
    sim.draw();

    requestAnimationFrame(loop);
  }

  requestAnimationFrame(loop);
});