using System.Collections.Generic;
using System.Linq;
using Unity.BossRoom.Gameplay.GameplayObjects.Character;
using UnityEngine;
using Unity.Netcode;

public class CrowManager : NetworkBehaviour
{
    public static CrowManager Instance { get; private set; }

    public List<ServerCharacter> players = new List<ServerCharacter>();

    private ServerCharacter currentCrow;
    public Transform mapCenter;
    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(this);
            return;
        }
        Instance = this;
    }

    public override void OnNetworkSpawn()
    {
        if (!IsServer)
        {
            enabled = false; // Disable CrowManager on clients
            return;
        }
    }

    private void Update()
    {
        if (!IsServer) return; // Ensure logic only runs on the server
        DetermineCrow();
    }

    /// <summary>
    /// Populates the players list from active ServerCharacters in the scene.
    /// </summary>
    private void PopulatePlayersList()
    {
        players.Clear();
        players = FindObjectsOfType<ServerCharacter>().ToList();
        Debug.Log("CrowManager: Players list populated.");
    }

    /// <summary>
    /// Determines which player should be the crow.
    /// </summary>
    int unoccupiedPlayers = 0;
    
    private void DetermineCrow()
    {
        unoccupiedPlayers = 0;

        ServerCharacter potentialCrow = null;

        foreach (var player in players)
        {
            if (!player.IsOnAPlatform)
            {
                unoccupiedPlayers++;
                potentialCrow = player;
            }
        }

        if (unoccupiedPlayers == 1)
        {
            AssignCrow(potentialCrow);
        }
        else if (unoccupiedPlayers == 0 && currentCrow != null)
        {
            ClearCrow();
        }
    }

    /// <summary>
    /// Assigns a player as the Crow.
    /// </summary>
    /// <param name="player">The ServerCharacter to assign as Crow.</param>
    private void AssignCrow(ServerCharacter player)
    {
        if (currentCrow == player) return;

        if (currentCrow != null)
        {
            currentCrow.Movement.SetSpeedModifier(1f);
            var foresightPrefab = FindObjectOfType<CrowsForesightPrefab>();
            if (foresightPrefab)
            {
                foresightPrefab.DespawnForesight();
            }
            currentCrow.SetAsCrow(false); // Clear old crow
        }

        currentCrow = player;
        currentCrow.SetAsCrow(true);
        Debug.Log($"{currentCrow.name} is now the Crow.");

        currentCrow.Movement.SetSpeedModifier(1.5f);
        // Notify all clients about the new crow
        NotifyCrowChangeClientRpc(currentCrow.OwnerClientId);
    }

    /// <summary>
    /// Clears the current Crow if no player is unoccupied.
    /// </summary>
    public void ClearCrow()
    {
        if (currentCrow != null)
        {
            Debug.Log($"[CrowManager] {currentCrow.name} landed on a platform. Removing crow status.");
            currentCrow.SetAsCrow(false);
            currentCrow = null;

            // Notify all clients that the crow role is cleared
            NotifyCrowChangeClientRpc(0); // 0 means no crow
        }

        // Recalculate crow status after removing the old crow
        DetermineCrow();
    }


    
    
    /// <summary>
    /// RPC to notify clients about the Crow change.
    /// </summary>
    /// <param name="crowClientId">The Client ID of the new crow, or 0 if no crow.</param>
    [Rpc(SendTo.Everyone)]
    private void NotifyCrowChangeClientRpc(ulong crowClientId)
    {
        foreach (var player in players)
        {
            if (player.OwnerClientId == crowClientId)
            {
                player.SetAsCrow(true);
                player.SwitchToCrowModel();
                currentCrow = player;
                Debug.Log($"Client: {player.name} is the new Crow.");
            }
            else
            {
                // // If a player was the crow but is now losing it, request foresight removal
                // if (player.IsCrow)
                // {
                //     Debug.Log($"[CrowManager] {player.name} is no longer the Crow. Requesting foresight removal.");
                //     if (IsServer)
                //     {
                //         var foresightPrefab = FindObjectOfType<CrowsForesightPrefab>();
                //         if (foresightPrefab)
                //         {
                //             foresightPrefab.DespawnForesight();
                //         }
                //     }
                // }

                player.SetAsCrow(false);
                player.SwitchToPlayerModel();
            }
        }
    }


    /// <summary>
    /// Adds a character to the players list.
    /// </summary>
    /// <param name="character">The ServerCharacter to add.</param>
    public void AddCharacterToList(ServerCharacter character)
    {
        if (!players.Contains(character))
        {
            players.Add(character);
            Debug.Log($"Player {character.name} added to CrowManager.");
        }
    }

    /// <summary>
    /// Removes a character from the players list.
    /// </summary>
    /// <param name="character">The ServerCharacter to remove.</param>
    public void RemoveCharacterFromList(ServerCharacter character)
    {
        if (players.Contains(character))
        {
            players.Remove(character);
            Debug.Log($"Player {character.name} removed from CrowManager.");
        }
    }

    /// <summary>
    /// Ensures the players list is updated when a player is spawned or despawned.
    /// </summary>  
    /// <param name="character">The ServerCharacter to track.</param>
    public void OnPlayerSpawned(ServerCharacter character)
    {
        AddCharacterToList(character);
    }

    public void OnPlayerDespawned(ServerCharacter character)
    {
        RemoveCharacterFromList(character);
    }

    /// <summary>
    /// Retrieves the current Crow.
    /// </summary>
    /// <returns>The current Crow player.</returns>
    public ServerCharacter GetCurrentCrow()
    {
        return currentCrow;
    }
    
    public void NotifyForesightSwap(ulong senderId, ulong receiverId, Vector3 senderPos, Vector3 receiverPos)
    {
        Debug.Log($"[CrowManager] NotifyForesightSwap called - Sender: {senderId}, Receiver: {receiverId}, SenderPos: {senderPos}, ReceiverPos: {receiverPos}");

        if (currentCrow)
        {
            Debug.Log($"[CrowManager] Sending foresight swap notification to the Crow: {currentCrow.OwnerClientId}");
            NotifySwapForesightClientRpc(senderId, receiverId, senderPos, receiverPos);
        }
        else
        {
            Debug.LogWarning("[CrowManager] No current crow found to receive the foresight swap update.");
        }
    }

    public void NotifyForesightSwapDecision(ulong senderId, Vector3 receiverPos, bool isAccepted)
    {
        if (currentCrow)
        {
            NotifySwapForesightDecisionClientRpc(senderId, receiverPos, isAccepted);
        }
    }
    
    [Rpc(SendTo.Everyone)]
    private void NotifySwapForesightDecisionClientRpc(ulong senderId, Vector3 receiverPos, bool isAccepted)
    {
        if (currentCrow == null)
        {
            Debug.LogError("[CrowManager] Error: currentCrow is null!");
            return;
        }

        if (currentCrow.clientCharacter == null)
        {
            Debug.LogError("[CrowManager] Error: currentCrow.clientCharacter is null!");
            return;
        }

        var foresightPrefab = FindObjectOfType<CrowsForesightPrefab>();

        if (foresightPrefab == null)
        {
            Debug.LogError("[CrowManager] Error: CrowsForesightPrefab not found!");
            return;
        }

        if (isAccepted)
        {
            foresightPrefab.OnSwapAccepted(senderId, receiverPos);
        }
        else
        {
            foresightPrefab.OnSwapRejected(senderId, receiverPos);
        }
    }

    

    [Rpc(SendTo.Everyone)]
    private void NotifySwapForesightClientRpc(ulong senderId, ulong receiverId, Vector3 senderPos, Vector3 receiverPos)
    {
        Debug.Log($"[CrowManager] NotifySwapForesightClientRpc received - Sender: {senderId}, Receiver: {receiverId}, SenderPos: {senderPos}, ReceiverPos: {receiverPos}");

        if (currentCrow == null)
        {
            Debug.LogError("[CrowManager] Error: Current Crow is null!");
            return;
        }

        if (currentCrow.clientCharacter == null)
        {
            Debug.LogError("[CrowManager] Error: Current Crow clientCharacter is null!");
            return;
        }

        var foresightPrefab = FindObjectOfType<CrowsForesightPrefab>();

        if (foresightPrefab == null)
        {
            Debug.LogError("[CrowManager] Error: CrowsForesightPrefab not found on Crow!");
            return;
        }

        foresightPrefab.OnSwapRequested(senderId, receiverId, senderPos, receiverPos);
    }
    

    
}