namespace MembranePoreTester.Models
{
    public class TestLiquid : IEquatable<TestLiquid>
    {
        public string Name { get; set; }
        public double SurfaceTension { get; set; } // mN/m, 25°C

        // Cγ 值
        public double C_Pa => 2860 * SurfaceTension;
        public double C_cmHg => 2.15 * SurfaceTension;
        public double C_psi => 0.415 * SurfaceTension;

        private static readonly List<TestLiquid> _predefined = new()
        {
            new TestLiquid { Name = "水", SurfaceTension = 72.0 },
            new TestLiquid { Name = "石油馏分", SurfaceTension = 30.0 },
            new TestLiquid { Name = "乙醇", SurfaceTension = 22.3 },
            new TestLiquid { Name = "液态石蜡", SurfaceTension = 34.7 },
            new TestLiquid { Name = "BSD16", SurfaceTension = 16.0 }  // 新增
        };

        // 返回可修改的全局液体列表（允许在运行时添加自定义液体便于恢复选择）
        public static List<TestLiquid> Predefined => _predefined;

        public override string ToString() => Name;

        public bool Equals(TestLiquid other)
        {
            if (other is null) return false;
            // 以 Name 为主键判断相等，SurfaceTension 可作为辅助信息
            return string.Equals(Name, other.Name, StringComparison.Ordinal);
        }

        public override bool Equals(object obj) => Equals(obj as TestLiquid);

        public override int GetHashCode() => Name?.GetHashCode() ?? 0;
    }
}