using System.Collections.Generic;
using System.IO;
using Game.NavigationTool.Editor.Toolbar;
using JetBrains.Annotations;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace Game.NavigationTool.Editor.Tools
{
    [UsedImplicitly]
    internal sealed class ToolScenePicker : IToolbarDrawer
    {
        public bool Visible => true;
        public bool Enabled => !EditorApplication.isPlaying && !EditorApplication.isPlayingOrWillChangePlaymode;
        public EToolbarPlacement Placement => EToolbarPlacement.Right;

        private static bool IS_DIRTY = true;
        private static int SELECTED_INDEX = -1;
        private static string[] OPTIONS = new string[0];
        private static string[] PATHS = new string[0];

        private void Initialize()
        {
            if (!IS_DIRTY)
                return;

            EditorBuildSettingsScene[] scenes = EditorBuildSettings.scenes;
            var listNames = new List<string>(scenes.Length);
            var listPaths = new List<string>(scenes.Length);

            for (var i = 0; i < scenes.Length; i++)
            {
                if (string.IsNullOrEmpty(scenes[i].path))
                    continue;

                listNames.Add(Path.GetFileNameWithoutExtension(scenes[i].path));
                listPaths.Add(scenes[i].path);
            }

            OPTIONS = listNames.ToArray();
            PATHS = listPaths.ToArray();

            Scene activeScene = SceneManager.GetActiveScene();
            SELECTED_INDEX = listPaths.IndexOf(activeScene.path);
            IS_DIRTY = false;
        }

        public void Update()
        {
            Initialize();
        }

        public void Draw(Rect rect, Styles styles)
        {
            Initialize();
            int temp = EditorGUI.Popup(rect, SELECTED_INDEX, OPTIONS, styles.popup);

            if (temp != -1 && temp != SELECTED_INDEX && OPTIONS.Length != 0)
            {
                SELECTED_INDEX = temp;
                EditorSceneManager.OpenScene(PATHS[SELECTED_INDEX], OpenSceneMode.Single);
            }
        }

        public float CalculateWidth()
        {
            return 100.0f;
        }

        public static void SetAsDirty()
        {
            IS_DIRTY = true;
        }
    }
}