using Fusion;
using Baba_yaga.Game;
using Baba_yaga.UI;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;

namespace Baba_yaga.Network
{
    /// <summary>
    /// Orchestrates the Elo calculation and persistence on the Host.
    /// Broadcasts results to all clients.
    /// </summary>
    [UnityEngine.Scripting.APIUpdating.MovedFrom(true, sourceNamespace: "Hallucinate.Network", sourceAssembly: "Opsive.UltimateCharacterController")]
    public class MatchEloManager : NetworkBehaviour
    {
        [Networked] public EloResult LastMatchResult { get; set; }
        [Networked] public bool IsCalculating { get; set; }

        private Dictionary<PlayerRef, string> _playerUsernames = new Dictionary<PlayerRef, string>();

        // Simulating the database locally instead of Firebase
        private static Dictionary<string, PlayerEloData> _localEloDatabase = new Dictionary<string, PlayerEloData>();

        private Task<PlayerEloData> GetLocalPlayerData(string username)
        {
            if (!_localEloDatabase.TryGetValue(username, out var data))
            {
                data = PlayerEloData.Default;
                _localEloDatabase[username] = data;
            }
            return Task.FromResult(data);
        }

        private Task SaveLocalPlayerData(string username, PlayerEloData data)
        {
            _localEloDatabase[username] = data;
            return Task.CompletedTask;
        }

        public override void Spawned()
        {
            if (Object.HasStateAuthority)
            {
                // In a real scenario, you'd collect usernames as players join.
                // For now, we assume they are provided or stored in PlayerRef custom data.
                // Placeholder: Use a mock or collect from Session properties.
            }
        }

        /// <summary>
        /// Registers a player's username when they join.
        /// </summary>
        [Rpc(RpcSources.All, RpcTargets.StateAuthority)]
        public void RPC_RegisterUsername(PlayerRef player, string username)
        {
            if (!_playerUsernames.ContainsKey(player))
            {
                _playerUsernames.Add(player, username);
                Debug.Log($"[EloManager] Registered {username} for {player}");
            }
        }

        /// <summary>
        /// Called by GameManager on Host when match ends.
        /// </summary>
        public async void ProcessMatchResult(PlayerRef winner, PlayerRef loser, bool isDraw = false)
        {
            if (!Object.HasStateAuthority) return;

            IsCalculating = true;

            string nameA = _playerUsernames.GetValueOrDefault(winner, "Unknown_A");
            string nameB = _playerUsernames.GetValueOrDefault(loser, "Unknown_B");

            // 1. Fetch from local simulated database
            var dataA = await GetLocalPlayerData(nameA);
            var dataB = await GetLocalPlayerData(nameB);

            // 2. Calculate
            float resultA = isDraw ? 0.5f : 1.0f;
            var result = EloSystem.Calculate(dataA.Rating, dataB.Rating, dataA.GamesPlayed, dataB.GamesPlayed, resultA);

            // 3. Update Data Objects
            dataA.Rating = result.NewRatingA;
            dataA.GamesPlayed++;
            
            dataB.Rating = result.NewRatingB;
            dataB.GamesPlayed++;

            // 4. Save to local simulated database
            await Task.WhenAll(
                SaveLocalPlayerData(nameA, dataA),
                SaveLocalPlayerData(nameB, dataB)
            );

            // 5. Broadcast
            LastMatchResult = result;
            IsCalculating = false;

            Debug.Log($"[EloManager] Match Processed. Winner: {nameA} (+{result.DeltaA}), Loser: {nameB} ({result.DeltaB})");
            
            // Send RPC to show UI
            RPC_NotifyClients(result);
        }

        [Rpc(RpcSources.StateAuthority, RpcTargets.All)]
        private void RPC_NotifyClients(EloResult result)
        {
            // This is where you'd trigger the Post-Match Rive/UI
            Debug.Log($"[Client] Received Elo Update: {result.DeltaA} / {result.DeltaB}");
        }
    }
}