using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using ShiroginSDK.Runtime.Modules.Data.Scripts;
using ShiroginSDK.Runtime.Modules.Events;
using ShiroginSDK.Runtime.Services.Base;
using ShiroginSDK.Runtime.Services.Interfaces;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace ShiroginSDK.Samples.RemoteConfigSample.Scripts
{
    /// <summary>
    ///     Visual demo for ShiroginSDK RemoteConfig system.
    ///     Automatically lists all local + remote configuration values
    ///     inside a RectTransform UI container at runtime.
    /// </summary>
    public class RemoteConfigSampleUI : MonoBehaviour
    {
        [Header("UI References")] [SerializeField]
        private Button fetchButton;

        [SerializeField]
        private Button clearCacheButton;

        [SerializeField]
        private Button reloadButton;

        [SerializeField]
        private RectTransform contentParent;

        [SerializeField]
        private TMP_Text templateText;

        [SerializeField]
        private TMP_Text logText;

        [SerializeField]
        private TMP_Text gameNameText;

        private readonly List<TMP_Text> _spawnedEntries = new();

        private IDataService _dataService;
        private IEventService _eventService;
        private IRemoteConfigService _remoteConfigService;

        private void Awake()
        {
            _dataService = ServiceLocator.Get<IDataService>();
            _eventService = ServiceLocator.Get<IEventService>();
            _remoteConfigService = ServiceLocator.Get<IRemoteConfigService>();

            fetchButton?.onClick.AddListener(OnFetchRemoteConfig);
            clearCacheButton?.onClick.AddListener(OnClearCache);
            reloadButton?.onClick.AddListener(OnReload);

            if (templateText != null)
                templateText.gameObject.SetActive(false);

            Log("🧠 RemoteConfigSampleUI initialized.");
        }

        private void OnEnable()
        {
            _eventService.Subscribe<ShiroginEvents.RemoteConfig.RemoteConfigUpdatedEvent>(OnRemoteConfigUpdated);
            Log("📡 Listening for RemoteConfigUpdatedEvent...");
            RefreshUI();
        }

        private void OnDisable()
        {
            _eventService.Unsubscribe<ShiroginEvents.RemoteConfig.RemoteConfigUpdatedEvent>(OnRemoteConfigUpdated);
        }

        private void UpdateGameName()
        {
            var data = _dataService.Get<RemoteConfigData>();
            gameNameText.text = data != null ? data.GameName : "Unknown";
        }

        // ---------------------------------------------------------
        // 🔄 FETCH FROM FIREBASE
        // ---------------------------------------------------------
        private void OnFetchRemoteConfig()
        {
            if (_remoteConfigService == null)
            {
                Log("❌ RemoteConfigService not found.");
                return;
            }

            Log("🔄 Fetching Remote Config from Firebase...");
            _remoteConfigService.ForceRefresh();
        }

        // ---------------------------------------------------------
        // ✅ EVENT: NEW DATA ARRIVED
        // ---------------------------------------------------------
        private void OnRemoteConfigUpdated(ShiroginEvents.RemoteConfig.RemoteConfigUpdatedEvent e)
        {
            Log("✅ Remote Config updated from Firebase. Reloading UI...");
            RefreshUI();
        }

        // ---------------------------------------------------------
        // 🧹 CLEAR CACHE
        // ---------------------------------------------------------
        private void OnClearCache()
        {
            var cache = _dataService.Get<RemoteConfigData>();
            if (cache == null)
            {
                Log("⚠️ RemoteConfigData not found.");
                return;
            }

            cache.CachedJson = "{}";
            cache.LastFetchTicksUtc = 0;
            cache.Save();

            Log("🧹 RemoteConfig local cache cleared.");
            RefreshUI();
        }

        // ---------------------------------------------------------
        // 🔁 MANUAL RELOAD
        // ---------------------------------------------------------
        private void OnReload()
        {
            Log("🔁 Manual reload requested.");
            var data = _dataService.Get<RemoteConfigData>();
            data?.Load();
            RefreshUI();
        }

        // ---------------------------------------------------------
        // 🪄 REFRESH DISPLAY
        // ---------------------------------------------------------
        private void RefreshUI()
        {
            if (contentParent == null || templateText == null)
            {
                Log("❌ Missing UI references (contentParent or templateText).");
                return;
            }

            UpdateGameName();

            foreach (var entry in _spawnedEntries)
                if (entry != null)
                    Destroy(entry.gameObject);
            _spawnedEntries.Clear();

            var data = _dataService.Get<RemoteConfigData>();
            if (data == null)
            {
                Log("⚠️ RemoteConfigData not found in DataService.");
                return;
            }

            var fields = typeof(RemoteConfigData).GetFields(
                BindingFlags.Public | BindingFlags.Instance);

            foreach (var field in fields)
            {
                var val = field.GetValue(data);
                var valueString = FormatValue(val);
                AddEntry(field.Name, valueString);
            }

            AddEntry("🕒 Last Fetch", data.GetLastFetchTimeString());
            AddEntry("💾 Cached JSON",
                string.IsNullOrEmpty(data.CachedJson)
                    ? "{}"
                    : data.CachedJson.Length > 120
                        ? data.CachedJson[..120] + "..."
                        : data.CachedJson);

            Canvas.ForceUpdateCanvases();
            LayoutRebuilder.ForceRebuildLayoutImmediate(contentParent);
        }

        // ---------------------------------------------------------
        // 🔧 HELPERS
        // ---------------------------------------------------------
        private string FormatValue(object val)
        {
            if (val == null) return "null";
            if (val is Array arr)
                return string.Join(",", arr.Cast<object>());
            return val.ToString();
        }

        private void AddEntry(string key, string val)
        {
            var entry = Instantiate(templateText, contentParent);
            entry.text = $"{key}: <color=#00FFD5>{val}</color>";
            entry.gameObject.SetActive(true);
            _spawnedEntries.Add(entry);
        }

        private void Log(string msg)
        {
            Debug.Log($"[RemoteConfigSampleUI] {msg}");
            if (logText != null)
                logText.text = msg + "\n" + logText.text;
        }
    }
}