#if UNITY_EDITOR
using System.IO;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.Rendering;

/// <summary>
/// 历史 Explorer / LmCat 观察场景，保留旧 -Z 资产及相机方向；项目新资源采用 +Z 正面。
/// unity command run_script --file AgentScripts/BuildModelView.cs --entry BuildModelView.Run
/// </summary>
public static class BuildModelView
{
    const string SceneDir = "Assets/Bundles/Scenes/Test/ModelView";
    const string ScenePath = SceneDir + "/ModelView.unity";
    const string GroundMatPath = SceneDir + "/Ground.mat";
    const string GirlPath = "Assets/Bundles/Characters/Human/Explorer/Explorer.prefab";
    const string CatPath = "Assets/Bundles/Characters/Animal/LmCat/LmCat.prefab";

    public static string Run()
    {
        var girl = AssetDatabase.LoadAssetAtPath<GameObject>(GirlPath);
        var cat = AssetDatabase.LoadAssetAtPath<GameObject>(CatPath);
        if (girl == null)
            return "missing " + GirlPath;
        if (cat == null)
            return "missing " + CatPath;

        Directory.CreateDirectory(SceneDir);
        var scene = EditorSceneManager.NewScene(NewSceneSetup.EmptyScene, NewSceneMode.Single);

        var lightGo = new GameObject("Directional Light");
        var light = lightGo.AddComponent<Light>();
        light.type = LightType.Directional;
        light.color = new Color(1f, 0.96f, 0.9f);
        light.intensity = 1.2f;
        light.shadows = LightShadows.Soft;
        lightGo.transform.rotation = Quaternion.Euler(48f, -25f, 0f);

        var groundMat = AssetDatabase.LoadAssetAtPath<Material>(GroundMatPath);
        if (groundMat == null)
        {
            var shader = Shader.Find("Universal Render Pipeline/Lit") ?? Shader.Find("Standard");
            groundMat = new Material(shader);
            groundMat.color = new Color(0.82f, 0.84f, 0.86f);
            AssetDatabase.CreateAsset(groundMat, GroundMatPath);
        }

        var ground = GameObject.CreatePrimitive(PrimitiveType.Plane);
        ground.name = "Ground";
        ground.transform.localScale = new Vector3(14f, 1f, 14f);
        ground.GetComponent<MeshRenderer>().sharedMaterial = groundMat;

        var houses = PlaceHouses();

        var girlGo = (GameObject)PrefabUtility.InstantiatePrefab(girl);
        girlGo.name = "Explorer";
        girlGo.transform.SetPositionAndRotation(new Vector3(-1.6f, 0f, -36f), Quaternion.identity);

        var catGo = (GameObject)PrefabUtility.InstantiatePrefab(cat);
        catGo.name = "LmCat";
        catGo.transform.SetPositionAndRotation(new Vector3(1.6f, 0f, -36f), Quaternion.identity);

        var bounds = RendererBounds(girlGo);
        bounds.Encapsulate(RendererBounds(catGo));
        foreach (var house in houses)
            bounds.Encapsulate(RendererBounds(house));
        var camGo = new GameObject("Main Camera");
        camGo.tag = "MainCamera";
        var cam = camGo.AddComponent<Camera>();
        cam.clearFlags = CameraClearFlags.SolidColor;
        cam.backgroundColor = new Color(0.93f, 0.94f, 0.95f);
        cam.fieldOfView = 32f;
        cam.nearClipPlane = 0.1f;
        cam.farClipPlane = 250f;
        camGo.AddComponent<AudioListener>();

        var center = bounds.center;
        var halfFov = cam.fieldOfView * 0.5f * Mathf.Deg2Rad;
        var distY = bounds.size.y / (2f * Mathf.Tan(halfFov) * 0.62f);
        var aspect = 16f / 9f;
        var halfFovX = Mathf.Atan(Mathf.Tan(halfFov) * aspect);
        var distX = bounds.size.x / (2f * Mathf.Tan(halfFovX) * 0.72f);
        var dist = Mathf.Max(distY, distX);
        var camPos = center + new Vector3(0f, bounds.size.z * 0.36f, -dist * 1.08f);
        camGo.transform.position = camPos;
        camGo.transform.LookAt(center);

        RenderSettings.ambientMode = AmbientMode.Trilight;
        RenderSettings.ambientSkyColor = new Color(0.55f, 0.58f, 0.62f);
        RenderSettings.ambientEquatorColor = new Color(0.42f, 0.42f, 0.42f);
        RenderSettings.ambientGroundColor = new Color(0.28f, 0.28f, 0.28f);

        EditorSceneManager.SaveScene(scene, ScenePath);
        return $"scene={ScenePath} houses={houses.Count} girlH={Height(girlGo):F2} catH={Height(catGo):F2} cam={camPos}";
    }

    static System.Collections.Generic.List<GameObject> PlaceHouses()
    {
        var names = new[]
        {
            "cream_tile", "cream_red", "white_balcony", "brown_wood",
            "cream_porch", "stone_balcony", "thatched", "white_blue",
            "wood_fence", "shop_awning", "picket", "gate",
        };
        var placed = new System.Collections.Generic.List<GameObject>();
        const float gap = 22f;
        for (var i = 0; i < names.Length; i++)
        {
            var path = $"Assets/Bundles/Scenes/Test/LmHouses/{names[i]}/{names[i]}.prefab";
            var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(path);
            if (prefab == null)
                continue;
            var col = i % 4;
            var row = i / 4;
            var go = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
            go.name = names[i];
            go.transform.SetPositionAndRotation(
                new Vector3((col - 1.5f) * gap, 0f, (row - 1f) * gap),
                Quaternion.identity);
            placed.Add(go);
        }
        return placed;
    }

    static Bounds RendererBounds(GameObject root)
    {
        Bounds bounds = default;
        var has = false;
        foreach (var r in root.GetComponentsInChildren<Renderer>())
        {
            if (!has)
            {
                bounds = r.bounds;
                has = true;
            }
            else bounds.Encapsulate(r.bounds);
        }
        return has ? bounds : new Bounds(root.transform.position, Vector3.one);
    }

    static float Height(GameObject root)
    {
        return RendererBounds(root).size.y;
    }
}
#endif