using OSMDatastructure;
using OSMDatastructure.Graph;

namespace Pathfinding;

public static partial class Pathfinder
{

    private static ValueTuple<OsmNode?, OsmNode?> SetupNodes(Coordinates startCoordinates, Coordinates goalCoordinates, RegionManager regionManager )
    {
        ValueTuple<OsmNode?, OsmNode?> retTuple = new();
        retTuple.Item1 = regionManager.ClosestNodeToCoordinates(startCoordinates, Tag.SpeedType.road);
        retTuple.Item2 = regionManager.ClosestNodeToCoordinates(goalCoordinates, Tag.SpeedType.road);
        if (retTuple.Item1 is null || retTuple.Item2 is null)
            return retTuple;
        retTuple.Item1.currentPathWeight = 0;
        retTuple.Item1.currentPathLength = 0;
        retTuple.Item1.directDistanceToGoal =  Utils.DistanceBetween(retTuple.Item1, retTuple.Item2);
        return retTuple;
    }

    private static double EdgeWeight(OsmNode node1, OsmNode node2, ulong wayId, Tag.SpeedType vehicle, ref RegionManager regionManager)
    {
        double distance = Utils.DistanceBetween(node1, node2);
        double speed = regionManager.GetSpeedForEdge(node1, wayId, vehicle);
        if (speed is not 0)
            return distance / speed;
        return double.PositiveInfinity;
    }
}