namespace AtlasUtility
{
    using UnityEditor;
    using UnityEngine;
    using UnityEditor.SceneManagement;

    using System;
    using System.IO;
    using System.Linq;
    using System.Collections.Generic;

    public class ReferenceManager
    {
        public static void ChangeReference(List<string> fromReferenceList, List<string> toReferenceList)
        {
            if (fromReferenceList.Count != toReferenceList.Count)
            {
                throw new Exception("An error occured");
            }

            if (fromReferenceList.Count == 0)
            {
                return;
            }

            AssetDatabase.SaveAssets();
            EditorSceneManager.SaveOpenScenes();

            SerializationMode userSerializationMode = EditorSettings.serializationMode;

            EditorSettings.serializationMode = SerializationMode.ForceText;

            List<string> searchExtension = new List<string>()
            {
                ".asset",
                ".anim",
                ".unity",
                ".prefab"
            };

            List<string> pathList = Directory.GetFiles(Application.dataPath, "*.*", SearchOption.AllDirectories).Where
                (
                    path =>
                    {
                        string extension = Path.GetExtension(path);

                        if (searchExtension.Contains(extension))
                        {
                            return true;
                        }
                        else
                        {
                            return false;
                        }
                    }
                )
                .ToList();

            for (int i = 0; i < pathList.Count; i++)
            {
                EditorUtility.DisplayProgressBar("Changing reference", Path.GetFileNameWithoutExtension(pathList[i]), (i + 1)/(float) pathList.Count);

                string originText = File.ReadAllText(pathList[i]);
                string newText = originText;

                for (int j = 0; j < fromReferenceList.Count; j++)
                {
                    newText = newText.Replace(fromReferenceList[j], toReferenceList[j]);
                }

                if (newText != originText)
                {
                    File.WriteAllText(pathList[i], newText);
                }
            }

            EditorUtility.ClearProgressBar();

            EditorSettings.serializationMode = userSerializationMode;

            AssetDatabase.Refresh();
        }

        public static void ChangeAllReference()
        {
            if (!EditorUtility.DisplayDialog("Warning", "Are you sure you want to set all the references?", "Go ahead", "Cancel"))
            {
                return;
            }

            List<string> fromReferenceList = new List<string>();
            List<string> toReferenceList = new List<string>();

            List<string> itemList = ReferenceTable.ReadAllLine();

            for (int i = 0; i < itemList.Count; i++)
            {
                itemList[i] = itemList[i].TrimEnd((char)13);

                string atlasReference = itemList[i].Split('|')[0];
                string sourceReference = itemList[i].Split('|')[1];

                if (fromReferenceList.Contains(sourceReference))
                {
                    int index = fromReferenceList.IndexOf(sourceReference);

                    Debug.LogWarning($"Repeat sprite detected    {ReferenceToFakePath(atlasReference)}    {ReferenceToFakePath(toReferenceList[index])}");
                }

                fromReferenceList.Add(sourceReference);
                toReferenceList.Add(atlasReference);
            }

            ChangeReference(fromReferenceList, toReferenceList);
        }

        public static void ResetReference(List<string> pngPathList)
        {
            if (pngPathList.Count == 0)
            {
                return;
            }

            List<string> fromReferenceList = new List<string>();
            List<string> toReferenceList = new List<string>();

            List<string> itemList = ReferenceTable.ReadAllLine();

            foreach (string path in pngPathList)
            {
                string atlasGUID = AssetDatabase.AssetPathToGUID(path);

                for (int i = 0; i < itemList.Count; i++)
                {
                    itemList[i] = itemList[i].TrimEnd((char)13);

                    string atlasReference = itemList[i].Split('|')[0];
                    string sourceReference = itemList[i].Split('|')[1];

                    if (atlasReference.Contains(atlasGUID))
                    {
                        fromReferenceList.Add(atlasReference);
                        toReferenceList.Add(sourceReference);

                        itemList.RemoveAt(i--);
                    }
                }

                ChangeReference(fromReferenceList, toReferenceList);

                ReferenceTable.WriteAllLine(itemList);
            }
        }

        public static void ResetAllReference()
        {
            if (!EditorUtility.DisplayDialog("Warning", "Are you sure you want to reset all the references?", "Go ahead", "Cancel"))
            {
                return;
            }

            List<string> fromReferenceList = new List<string>();
            List<string> toReferenceList = new List<string>();

            List<string> itemList = ReferenceTable.ReadAllLine();

            for (int i = 0; i < itemList.Count; i++)
            {
                itemList[i] = itemList[i].TrimEnd((char)13);

                string atlasReference = itemList[i].Split('|')[0];
                string sourceReference = itemList[i].Split('|')[1];

                fromReferenceList.Add(atlasReference);
                toReferenceList.Add(sourceReference);
            }

            ChangeReference(fromReferenceList, toReferenceList);

            ReferenceTable.Clear();
        }


        public static string ReferenceToFakePath(string reference)
        {
            string guid = ReferenceToGUID(reference);
            string fileId = ReferenceToFileId(reference);

            int spriteIndex = (int.Parse(fileId) - 21300000)/2;
            
            string atlasPath = AssetDatabase.GUIDToAssetPath(guid);

            TextureImporter textureImporter = (TextureImporter) AssetImporter.GetAtPath(atlasPath);

            return $"{atlasPath}/{textureImporter.spritesheet[spriteIndex].name}";
        }

        public static string ReferenceToGUID(string reference)
        {
            return reference.Split(',')[1].Split(' ')[2];
        }

        public static string ReferenceToFileId(string reference)
        {
            return reference.Split(',')[0].Split(' ')[1];
        }

        public static List<string> GetChildPathList(string path)
        {
            List<string> pathList = new List<string>();
            List<string> itemList = ReferenceTable.ReadAllLine();

            string atlasGUID = AssetDatabase.AssetPathToGUID(path);
            
            for (int i = 0; i < itemList.Count; i++)
            {
                itemList[i] = itemList[i].TrimEnd((char) 13);

                string atlasReference = itemList[i].Split('|')[0];
                string sourceReference = itemList[i].Split('|')[1];

                if (atlasReference.Contains(atlasGUID))
                {
                    pathList.Add(AssetDatabase.GUIDToAssetPath(ReferenceToGUID(sourceReference)));
                }
            }

            return pathList;
        }
    }
}