using System.Collections.Generic;
using System.Text;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.SceneManagement;

/// <summary>Temporary edit-mode view of PrototypeArena through BattleCamera. Does not save.</summary>
public static class PreviewBattleFraming
{
    const string Arena = "Assets/Bundles/Scenes/Prototype/PrototypeArena.prefab";
    static readonly List<GameObject> Hidden = new List<GameObject>();
    static Scene Preview;

    public static string Show()
    {
        Close();
        for (int i = 0; i < SceneManager.sceneCount; i++)
        {
            var scene = SceneManager.GetSceneAt(i);
            foreach (var root in scene.GetRootGameObjects())
            {
                if (!root.activeSelf) continue;
                root.SetActive(false);
                Hidden.Add(root);
            }
        }
        Preview = EditorSceneManager.NewScene(NewSceneSetup.EmptyScene, NewSceneMode.Additive);
        var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(Arena);
        var arena = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
        SceneManager.MoveGameObjectToScene(arena, Preview);
        EditorSceneManager.SetActiveScene(Preview);
        for (int lane = 0; lane < 3; lane++)
        {
            float x = lane == 0 ? 0 : lane == 1 ? -3f : 3f;
            var hero = arena.transform.Find("Heroes/Hero" + lane);
            hero.gameObject.SetActive(true);
            hero.localPosition = new Vector3(x, 0, 0);
            var enemy = arena.transform.Find("Enemies/Enemy" + lane);
            enemy.gameObject.SetActive(true);
            enemy.localPosition = new Vector3(x, 0, 8);
        }
        var camera = arena.transform.Find("BattleCamera").GetComponent<Camera>();
        var view = SceneView.lastActiveSceneView;
        if (view == null) throw new System.Exception("No Scene View.");
        view.orthographic = camera.orthographic;
        view.LookAt(camera.transform.position + camera.transform.forward * 12f, camera.transform.rotation, camera.orthographicSize);
        view.camera.orthographic = camera.orthographic;
        view.camera.orthographicSize = camera.orthographicSize;
        view.Repaint();
        var ground = arena.transform.Find("Greenfield/Ground/GroundMesh").GetComponentInChildren<Renderer>().bounds;
        return "cameraPos=" + camera.transform.position + " ortho=" + camera.orthographicSize + " ground=" + ground.size + " center=" + ground.center;
    }

    public static string Measure()
    {
        GameObject arena = null;
        for (int i = 0; i < SceneManager.sceneCount; i++)
        {
            foreach (var root in SceneManager.GetSceneAt(i).GetRootGameObjects())
                if (root.name.Contains("PrototypeArena")) arena = root;
        }
        if (arena == null) throw new System.Exception("Battle preview is not open.");
        var renderers = arena.GetComponentsInChildren<Renderer>(true);
        int visible = 0;
        var materials = new HashSet<Material>();
        foreach (var renderer in renderers)
        {
            if (!renderer.enabled || !renderer.gameObject.activeInHierarchy) continue;
            visible++;
            foreach (var material in renderer.sharedMaterials) if (material != null) materials.Add(material);
        }
        return "visibleRenderers=" + visible + " materials=" + materials.Count;
    }

    public static string Status()
    {
        var report = new StringBuilder();
        for (int i = 0; i < SceneManager.sceneCount; i++)
        {
            var scene = SceneManager.GetSceneAt(i);
            report.Append(scene.name).Append(" path=").Append(scene.path).Append(" [");
            foreach (var root in scene.GetRootGameObjects()) report.Append(root.name).Append(root.activeSelf ? "" : "(off)").Append(",");
            report.Append("] ");
        }
        return report.ToString();
    }

    public static string Close()
    {
        var closed = new StringBuilder();
        for (int i = SceneManager.sceneCount - 1; i >= 0; i--)
        {
            var scene = SceneManager.GetSceneAt(i);
            if (!string.IsNullOrEmpty(scene.path)) continue;
            EditorSceneManager.CloseScene(scene, true);
            closed.Append(scene.name).Append(";");
        }
        int restored = 0;
        for (int i = 0; i < SceneManager.sceneCount; i++)
        {
            foreach (var root in SceneManager.GetSceneAt(i).GetRootGameObjects())
            {
                if (root.activeSelf) continue;
                root.SetActive(true);
                restored++;
            }
        }
        Preview = default;
        Hidden.Clear();
        return "closed=" + closed + " restored=" + restored;
    }
}