using System;
using System.Linq;
using UnityEditor;

[InitializeOnLoad]
sealed class EnviroAddDefineSymbolsHD
{
    const string k_Define = "ENVIRO_HD";

    static EnviroAddDefineSymbolsHD()
    {
        var targets = Enum.GetValues(typeof(BuildTargetGroup))
            .Cast<BuildTargetGroup>()
            .Where(x => x != BuildTargetGroup.Unknown)
            .Where(x => !IsObsolete(x));

        foreach (var target in targets)
        {
            var defines = PlayerSettings.GetScriptingDefineSymbolsForGroup(target).Trim();

            var list = defines.Split(';', ' ')
                .Where(x => !string.IsNullOrEmpty(x))
                .ToList();

            if (list.Contains(k_Define))
                continue;

            list.Add(k_Define);
            defines = list.Aggregate((a, b) => a + ";" + b);

            PlayerSettings.SetScriptingDefineSymbolsForGroup(target, defines);
        }
    }

    static bool IsObsolete(BuildTargetGroup group)
    {
        var attrs = typeof(BuildTargetGroup)
            .GetField(group.ToString())
            .GetCustomAttributes(typeof(ObsoleteAttribute), false);

        return attrs != null && attrs.Length > 0;
    }
}