using System.IO;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace Luneraria.EditorTools
{
    /// <summary>
    /// Rendering setup of the project (URP asset and renderer, linear colour space), idempotent.
    /// Unity -batchmode -projectPath . -executeMethod Luneraria.EditorTools.LuneProjectSetup.ConfigureRendering
    /// </summary>
    public static class LuneProjectSetup
    {
        public const string SettingsFolder = "Assets/Luneraria/Settings/Rendering";
        public const string PipelinePath = SettingsFolder + "/Luneraria_URP.asset";
        public const string RendererPath = SettingsFolder + "/Luneraria_URP_Renderer.asset";

        public static void ConfigureRendering()
        {
            int code = 0;
            try
            {
                Configure();
            }
            catch (System.Exception error)
            {
                Debug.LogError("LUNE_SETUP failed: " + error);
                code = 1;
            }
            EditorApplication.Exit(code);
        }

        public static UniversalRenderPipelineAsset Configure()
        {
            Directory.CreateDirectory(SettingsFolder);
            AssetDatabase.Refresh();
            var asset = AssetDatabase.LoadAssetAtPath<UniversalRenderPipelineAsset>(PipelinePath);
            if (asset == null)
            {
                var renderer = ScriptableObject.CreateInstance<UniversalRendererData>();
                AssetDatabase.CreateAsset(renderer, RendererPath);
                ResourceReloader.ReloadAllNullIn(renderer, UniversalRenderPipelineAsset.packagePath);
                asset = UniversalRenderPipelineAsset.Create(renderer);
                AssetDatabase.CreateAsset(asset, PipelinePath);
            }
            // The Godot sun reaches 190 m with four splits (scripts/luneraria/view/lune_world.gd).
            asset.shadowDistance = 190f;
            asset.shadowCascadeCount = 4;
            asset.supportsHDR = true;
            asset.msaaSampleCount = 4;
            asset.useSRPBatcher = true;
            EditorUtility.SetDirty(asset);
            GraphicsSettings.defaultRenderPipeline = asset;
            int current = QualitySettings.GetQualityLevel();
            for (int level = 0; level < QualitySettings.names.Length; level++)
            {
                QualitySettings.SetQualityLevel(level, false);
                QualitySettings.renderPipeline = asset;
            }
            QualitySettings.SetQualityLevel(current, false);
            PlayerSettings.colorSpace = ColorSpace.Linear;
            MoveInto("Assets/UniversalRenderPipelineGlobalSettings.asset", SettingsFolder + "/UniversalRenderPipelineGlobalSettings.asset");
            MoveInto("Assets/DefaultVolumeProfile.asset", SettingsFolder + "/DefaultVolumeProfile.asset");
            AssetDatabase.SaveAssets();
            Debug.Log("LUNE_SETUP rendering: " + PipelinePath + ", colour space " + PlayerSettings.colorSpace);
            return asset;
        }

        static void MoveInto(string from, string to)
        {
            if (File.Exists(from) && !File.Exists(to))
            {
                string error = AssetDatabase.MoveAsset(from, to);
                if (!string.IsNullOrEmpty(error))
                    Debug.LogWarning("LUNE_SETUP move " + from + ": " + error);
            }
        }
    }
}