using FarseerPhysics.Dynamics;

namespace Barotrauma
{
    static class Physics
    {
        public const Category CollisionNone         = Category.None;
        public const Category CollisionAll          = Category.All;
        public const Category CollisionWall         = Category.Cat1;
        public const Category CollisionCharacter    = Category.Cat2;
        public const Category CollisionPlatform     = Category.Cat3;
        public const Category CollisionStairs       = Category.Cat4;
        public const Category CollisionItem         = Category.Cat5;
        public const Category CollisionItemBlocking = Category.Cat6;
        public const Category CollisionProjectile   = Category.Cat7;
        public const Category CollisionLevel        = Category.Cat8;
        public const Category CollisionRepairableWall       = Category.Cat9;

        public const Category DefaultItemCollidesWith = CollisionWall | CollisionLevel | CollisionPlatform | CollisionRepairableWall;

        public static float DisplayToRealWorldRatio = 1.0f / 100.0f;

        public const float DisplayToSimRation = 100.0f;

        public const float NeutralDensity = 10.0f;

        public static bool TryParseCollisionCategory(string categoryName, out Category category)
        {
            category = Category.None;
            if (string.IsNullOrEmpty(categoryName))
            {
                return false;
            }
            switch (categoryName.ToLowerInvariant())
            {
                case "all":
                    category = CollisionAll;
                    return true;
                case "wall":
                case "structure":
                    category = CollisionWall;
                    return true;
                case "character":
                    category = CollisionCharacter;
                    return true;
                case "platform":
                    category = CollisionPlatform;
                    return true;
                case "stairs":
                    category = CollisionStairs;
                    return true;
                case "item":
                    category = CollisionItem;
                    return true;
                case "itemblocking":
                    category = CollisionItemBlocking;
                    return true;
                case "projectile":
                    category = CollisionProjectile;
                    return true;
                case "level":
                    category = CollisionLevel;
                    return true;
                case "repair":
                    category = CollisionRepairableWall;
                    return true;
                default:
                    return false;
            }
        }
    }
}