using UnityEngine;
using PlayFab;
using PlayFab.ClientModels;
using System.Collections.Generic;

public class PlayerPrefsSyncManager : MonoBehaviour
{
    private static PlayerPrefsSyncManager instance;

    private void OnApplicationQuit()
    {
        SyncPlayerPrefsToPlayFabOnQuit();
    }

    private void OnApplicationPause()
    {
        SyncPlayerPrefsToPlayFabOnQuit();
    }

    private void OnApplicationFocus(bool focus)
    {
        //if (!focus)
        SyncPlayerPrefsToPlayFabOnQuit();
    }

    void Awake()
    {
        if (instance == null)
        {
            instance = this;
            DontDestroyOnLoad(this.gameObject);
            Application.quitting += SyncPlayerPrefsToPlayFabOnQuit;
        }
        else
        {
            Destroy(gameObject);
        }
    }

    private const int MaxKeysPerRequest = 10;

    public void SyncPlayerPrefsToPlayFabOnQuit()
    {
        if (PlayFabClientAPI.IsClientLoggedIn())
        {

            var keys = PlayerPrefsKeys.GetAllKeys();
            if (keys.Count == 0)
            {
                Debug.Log("No PlayerPrefs keys registered, skipping sync.");
                return;
            }

            Dictionary<string, string> allPrefs = new Dictionary<string, string>();

            foreach (var key in keys)
            {
                string strVal = PlayerPrefs.GetString(key, "__MISSING__");
                if (strVal != "__MISSING__")
                {
                    allPrefs[key] = "string:" + strVal;
                    continue;
                }

                int intVal = PlayerPrefs.GetInt(key, int.MinValue + 1);
                if (intVal != int.MinValue + 1)
                {
                    allPrefs[key] = "int:" + intVal;
                    continue;
                }

                float floatVal = PlayerPrefs.GetFloat(key, float.MinValue + 1);
                if (floatVal != float.MinValue + 1)
                {
                    allPrefs[key] = "float:" + floatVal.ToString("R");
                }
            }

            foreach (var pair in allPrefs)
            {
                Debug.Log($"[Sync] {pair.Key} = {pair.Value}");
            }

            // Split into batches of 10
            var batches = new List<Dictionary<string, string>>();
            var currentBatch = new Dictionary<string, string>();

            foreach (var pair in allPrefs)
            {
                currentBatch[pair.Key] = pair.Value;
                if (currentBatch.Count == MaxKeysPerRequest)
                {
                    batches.Add(currentBatch);
                    currentBatch = new Dictionary<string, string>();
                }
            }

            if (currentBatch.Count > 0)
            {
                batches.Add(currentBatch);
            }

            UploadPlayerPrefsBatches(batches, 0);
        }

    }

    private void UploadPlayerPrefsBatches(List<Dictionary<string, string>> batches, int index)
    {
        if (index >= batches.Count)
        {
            Debug.Log("✅ All PlayerPrefs batches synced to PlayFab.");
            return;
        }

        var request = new UpdateUserDataRequest
        {
            Data = batches[index],
            Permission = UserDataPermission.Public
        };

        PlayFabClientAPI.UpdateUserData(request,
            result =>
            {
                Debug.Log($"✅ Synced batch {index + 1}/{batches.Count}");
                UploadPlayerPrefsBatches(batches, index + 1);
            },
            error =>
            {
                Debug.LogError($"❌ Failed to sync batch {index + 1}/{batches.Count}: {error.GenerateErrorReport()}");
            });
    }

}