using UnityEngine;
using System.Collections.Generic;

public class PatrolManager : MonoBehaviour
{
    public static PatrolManager Instance;

    // Dictionary tracking which AI is going to which world position
    private Dictionary<AIController, Vector3> aiTargets = new Dictionary<AIController, Vector3>();

    [Tooltip("How far apart AI patrol targets must be. Prevents them from driving down the exact same stretch of road.")]
    public float minimumSpacing = 40f;

    void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else
        {
            Destroy(gameObject);
        }
    }

    public void RegisterTarget(AIController ai, Vector3 targetPoint)
    {
        aiTargets[ai] = targetPoint;
    }

    public void UnregisterTarget(AIController ai)
    {
        if (aiTargets.ContainsKey(ai))
        {
            aiTargets.Remove(ai);
        }
    }

    // Checks if a generated road point is too close to where another AI is already heading
    public bool IsPointCrowded(Vector3 point, AIController requestingAI)
    {
        foreach (var kvp in aiTargets)
        {
            // Skip checking against ourselves
            if (kvp.Key == requestingAI) continue;

            // If another AI is heading to a point very close to this one, it's crowded!
            if (Vector3.Distance(point, kvp.Value) < minimumSpacing)
            {
                return true;
            }
        }
        return false;
    }
}