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

public static class TuneHomeCampExposure
{
    const string ProfilePath = "Assets/Bundles/Scenes/Town/HomeCamp/HomeCampVolume.asset";
    public static string Apply()
    {
        if (EditorApplication.isPlaying) throw new InvalidOperationException("Apply in Edit Mode.");
        var profile = AssetDatabase.LoadAssetAtPath<VolumeProfile>(ProfilePath);
        if (!profile || !profile.TryGet<ColorAdjustments>(out var color)) throw new InvalidOperationException("Missing camp ColorAdjustments");
        float before = color.postExposure.value;
        Undo.RecordObject(color, "Lower HomeCamp exposure");
        color.postExposure.Override(.30f);
        EditorUtility.SetDirty(color);
        AssetDatabase.SaveAssetIfDirty(color);
        return "Saved HomeCamp postExposure " + before + " -> " + color.postExposure.value + " EV";
    }

    public static string Capture()
    {
        var hud = HotUpdate.UI.UiManager.Instance?.Get("UI_MainHUD");
        if (!hud) throw new InvalidOperationException("Start the isolated home preview first.");
        var camera = GameObject.Find("HomeMobileTestCamera").GetComponent<Camera>();
        var canvas = hud.GetComponent<Canvas>();
        var target = new RenderTexture(Screen.width, Screen.height, 24);
        var pixels = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
        var mode = canvas.renderMode; var worldCamera = canvas.worldCamera; var mask = camera.cullingMask;
        var previous = RenderTexture.active;
        try
        {
            camera.targetTexture = target; camera.cullingMask = 1 << LayerMask.NameToLayer("UI");
            canvas.renderMode = RenderMode.ScreenSpaceCamera; canvas.worldCamera = camera; canvas.planeDistance = 1;
            Canvas.ForceUpdateCanvases(); camera.Render(); RenderTexture.active = target;
            pixels.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0); pixels.Apply();
            var dir = Path.GetFullPath(Path.Combine(Application.dataPath, "../../Tools/output/homecamp_exposure_20261104"));
            Directory.CreateDirectory(dir);
            var path = Path.Combine(dir, "home_exposure_030.png");
            File.WriteAllBytes(path, pixels.EncodeToPNG());
            return path;
        }
        finally
        {
            RenderTexture.active = previous; camera.targetTexture = null; camera.cullingMask = mask;
            canvas.renderMode = mode; canvas.worldCamera = worldCamera;
            target.Release(); UnityEngine.Object.Destroy(target); UnityEngine.Object.Destroy(pixels);
        }
    }
}