'use client';

import { useRef, useState, useCallback, useEffect } from 'react';
import * as THREE from 'three';
import {
  initScene,
  Die,
  DieInstance,
  setDice,
  stopRenderLoop,
  initRenderLoop,
  getW,
  getD,
} from '../lib/dicePhysics';

export interface RollResult {
  sides: number;
  value: number;
}

export function useDiceRoller() {
  const mountRef = useRef<HTMLDivElement>(null);
  const [isReady, setIsReady] = useState(false);
  const [isRolling, setIsRolling] = useState(false);
  const sceneInitRef = useRef(false);

  useEffect(() => {
    if (!mountRef.current || sceneInitRef.current) return;
    sceneInitRef.current = true;
    initScene(mountRef.current);
    initRenderLoop();

    const timer = setTimeout(() => setIsReady(true), 300);

    return () => {
      clearTimeout(timer);
      stopRenderLoop();
    };
  }, []);

  const rollDice = useCallback(
    (pool: Record<number, number>): Promise<RollResult[]> => {
      return new Promise((resolve) => {
        const totalDice = Object.values(pool).reduce((a, b) => a + b, 0);
        if (totalDice === 0) {
          resolve([]);
          return;
        }

        setIsRolling(true);

        const newDice: DieInstance[] = [];
        const W = getW();
        const D = getD();
        let idx = 0;
        const order = [20, 12, 10, 8, 6, 4];

        order.forEach((sides) => {
          const count = pool[sides] || 0;
          for (let i = 0; i < count; i++) {
            const die = new Die(sides);
            const side = idx % 2 === 0 ? -1 : 1;
            const x = side * (W - 0.8);
            const z = D - 1 - (idx % 3) * 1.1;
            const dir = new THREE.Vector3(
              -side * (9 + Math.random() * 4),
              0.5,
              -(6 + Math.random() * 4)
            );
            die.throwFrom(x, z, dir);
            die.pos.x -= side * idx * 0.15;
            newDice.push(die);
            idx++;
          }
        });

        setDice(newDice, (completedDice) => {
          const results: RollResult[] = completedDice.map((d) => ({
            sides: d.sides,
            value: d.value ?? 0,
          }));
          setIsRolling(false);
          resolve(results);
        });
      });
    },
    []
  );

  return { mountRef, rollDice, isReady, isRolling };
}