using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace TrafficSimulation{
    public class CarSpawner : MonoBehaviour
    {
        public CarPool carPool;
        public TrafficSystem trafficSystem;
        
        public float carSpacing;
        public float carSize = 4.0f;
        public float bufferZone = 3.0f;
        // Start is called before the first frame update
        void Start()
        {
            foreach(Segment segment in trafficSystem.segments){
                spawnOnSegment(segment);
            }
        }
        
        void spawnOnSegment(Segment segment){
            if(segment == null){ 
                Debug.Log("Segment is null");
                return;
            }
            if(segment.waypoints.Count <= 2){
                Debug.Log("Waypoints not set");
                return;
            }
            float distance = 0.0f;
            Waypoint lastWp = null;

            foreach(Waypoint wp in segment.waypoints)
            {
                if(lastWp != null)
                {
                    distance += Vector3.Distance(lastWp.transform.position, wp.transform.position);
                    float wpDistance = Vector3.Distance(lastWp.transform.position, wp.transform.position);
                    wpDistance = Mathf.Floor(wpDistance);

                    float spawnDistance = wpDistance;
                    spawnDistance -= bufferZone;
                    while(spawnDistance >= bufferZone)
                    {
                        Vector3 spawnPos = lastWp.transform.position;
                        Quaternion spawnRot = lastWp.transform.rotation;
                        Vector3 currentRoad = wp.transform.position - lastWp.transform.position;
                        spawnPos += (currentRoad.normalized * (wpDistance - spawnDistance));
                        carPool.SpawnCar(spawnPos,spawnRot,wp.transform);
                        Debug.Log("spawn Car on Segment " + segment.name + " and Waypoint " + lastWp.name +  " in Distance " + (wpDistance - spawnDistance));
                        spawnDistance -= carSize;
                        spawnDistance -= carSpacing;
                    }
                }
                lastWp = wp;
            }
            Debug.Log("Segment " + segment.name + "distance " + distance );
            //Transform spawnPos = segment.waypoints[0].transform;
            //spawnPos.LookAt(segment.waypoints[1].transform);
            //carPool.spawnCar(spawnPos);
        }
    }
}