/* MIT License

Copyright (c) 2025 PureForce

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. */

using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using Oxide.Core;

namespace Oxide.Plugins
{
    [Info("Team Leader Online", "PureForce", "3.0.1")]
    [Description("Ensures the team leader position is always held by an online team member.")]
    internal class TeamLeaderOnline : RustPlugin
    {
        #region Initialization
        private void Init()
        {
            LoadData();
        }

        private void OnServerInitialized(bool initial)
        {
            permission.RegisterPermission(PERM_ADMIN, this);
            permission.RegisterPermission(PERM_CLAIM, this);
            if (ShouldWipeTeamData())
            {
                leaderPriority.Clear();
                SaveData();
            }
            if (!initial)
            {
                foreach (var player in BasePlayer.activePlayerList)
                {
                    OnPlayerConnected(player);
                }
            }
        }

        private bool ShouldWipeTeamData()
        {
            RelationshipManager manager = RelationshipManager.ServerInstance;
            bool noTeamsFound = manager != null && manager.teams.Count == 0;
            return noTeamsFound && leaderPriority.Count != 0;
        }
        #endregion


        #region Permissions
        private const string PERM_ADMIN = "teamleaderonline.admin";
        private const string PERM_CLAIM = "teamleaderonline.claim";

        private bool HasPerm_Admin(BasePlayer player)
        {
            return permission.UserHasPermission(player.UserIDString, PERM_ADMIN);
        }

        private bool HasPerm_Claim(BasePlayer player)
        {
            return permission.UserHasPermission(player.UserIDString, PERM_CLAIM);
        }
        #endregion


        #region Commands
        [ChatCommand("tlo.claim")]
        private void TLO_Claim(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!HasPerm_Claim(player))
            {
                PrintToChat(player, GetMessage("NoPermission", player));
                return;
            }
            var team = player.Team;
            if (team == null)
            {
                PrintToChat(player, GetMessage("NoPlayerTeam", player));
                return;
            }
            if (HasPriorityLeader(team.teamID))
            {
                PrintToChat(player, GetMessage("Claim.LeaderExists", player));
                return;
            }
            SetPriorityLeader(team.teamID, player.userID);
            team.SetTeamLeader(player.userID);
            Puts($"{player.userID} has claimed priority leader of team {team.teamID}");
            PrintToChat(player, GetMessage("Claim.Success", player));
        }

        [ConsoleCommand("tlo.claim")]
        private void TLO_Claim(ConsoleSystem.Arg arg)
        {
            if (arg == null) return;
            if (arg.IsRcon)
            {
                arg.ReplyWith(GetMessage("NoActivePlayerFound"));
                return;
            }
            BasePlayer player = arg.Player();
            if (player == null)
            {
                arg.ReplyWith(GetMessage("NoActivePlayerFound"));
                return;
            }
            if (!HasPerm_Claim(player))
            {
                arg.ReplyWith(GetMessage("NoPermission", player));
                return;
            }
            var team = player.Team;
            if (team == null)
            {
                arg.ReplyWith(GetMessage("NoPlayerTeam", player));
                return;
            }
            if (HasPriorityLeader(team.teamID))
            {
                arg.ReplyWith(GetMessage("Claim.LeaderExists", player));
                return;
            }
            SetPriorityLeader(team.teamID, player.userID);
            team.SetTeamLeader(player.userID);
            Puts($"{player.userID} has claimed priority leader of team {team.teamID}");
            arg.ReplyWith(GetMessage("Claim.Success", player));
        }

        [ChatCommand("tlo.promote")]
        private void TLO_Promote(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!HasPerm_Admin(player))
            {
                PrintToChat(player, GetMessage("NoPermission", player));
                return;
            }
            if (args == null || args.Length != 1)
            {
                PrintToChat(player, GetMessage("Admin.Promote.Syntax", player));
                return;
            }
            ulong targetId;
            if (!ulong.TryParse(args[0], out targetId) || !targetId.IsSteamId())
            {
                PrintToChat(player, GetMessage("InvalidSteamId", player));
                return;
            }
            BasePlayer target = BasePlayer.activePlayerList.FirstOrDefault(x => x.userID == targetId);
            if (target == null)
            {
                PrintToChat(player, GetMessage("NoActivePlayerFound", player));
                return;
            }
            RelationshipManager.PlayerTeam team = target.Team;
            if (team == null)
            {
                PrintToChat(player, GetMessage("NoPlayerTeam", player));
                return;
            }
            if (IsPriorityLeader(team.teamID, target.userID))
            {
                PrintToChat(player, GetMessage("Admin.Promote.Unnecessary", player), target.userID);
                return;
            }
            SetPriorityLeader(team.teamID, target.userID);
            team.SetTeamLeader(target.userID);
            Puts($"{player.userID} has promoted {target.userID} to priority leader of team {team.teamID}");
            PrintToChat(player, GetMessage("Admin.Promote.Success", player), target.userID);
        }

        [ConsoleCommand("tlo.promote")]
        private void TLO_Promote(ConsoleSystem.Arg arg)
        {
            if (arg == null) return;
            BasePlayer player = arg.Player();
            if (!arg.IsRcon)
            {
                if (player == null || !HasPerm_Admin(player))
                {
                    arg.ReplyWith(GetMessage("NoPermission"));
                    return;
                }
            }
            if (arg.Args == null || arg.Args.Length != 1)
            {
                arg.ReplyWith(GetMessage("Admin.Promote.Syntax"));
                return;
            }
            ulong targetId;
            if (!ulong.TryParse(arg.Args[0], out targetId) || !targetId.IsSteamId())
            {
                arg.ReplyWith(GetMessage("InvalidSteamId"));
                return;
            }
            BasePlayer target = BasePlayer.activePlayerList.FirstOrDefault(x => x.userID == targetId);
            if (target == null)
            {
                arg.ReplyWith(GetMessage("NoActivePlayerFound"));
                return;
            }
            RelationshipManager.PlayerTeam team = target.Team;
            if (team == null)
            {
                arg.ReplyWith(GetMessage("NoPlayerTeam"));
                return;
            }
            if (IsPriorityLeader(team.teamID, target.userID))
            {
                arg.ReplyWith(string.Format(GetMessage("Admin.Promote.Unnecessary"), target.userID));
                return;
            }
            SetPriorityLeader(team.teamID, target.userID);
            team.SetTeamLeader(target.userID);
            string initiator = arg.IsRcon ? "RCON" : player.UserIDString;
            Puts($"{initiator} has promoted {target.userID} to priority leader of team {team.teamID}");
            arg.ReplyWith(string.Format(GetMessage("Admin.Promote.Success"), target.userID));
        }
        #endregion


        #region Messages
        protected override void LoadDefaultMessages()
        {
            lang.RegisterMessages(new Dictionary<string, string>
            {
                ["Admin.Promote.Fail"] = "Failed to promote user {0}.",
                ["Admin.Promote.Success"] = "User {0} now has leader priority.",
                ["Admin.Promote.Syntax"] = "Syntax: tlo.promote <steamId>",
                ["Admin.Promote.Unnecessary"] = "User {0} already has leader priority.",
                ["Claim.Fail"] = "Failed to claim team.",
                ["Claim.LeaderExists"] = "Your team already has a priority leader.",
                ["Claim.Success"] = "You now have team leader priority.",
                ["Claim.Suggest"] = "Claim your team's priority leader position with <color=#AAFF00>/tlo.claim</color> this grants you leader position on login regardless of who currently has it. Only the priority leader can promote another team member to the priority leader position.",
                ["InvalidSteamId"] = "Invalid SteamId.",
                ["NoActivePlayerFound"] = "No active player found.",
                ["NoPermission"] = "You do not have permission.",
                ["NoPlayerTeam"] = "No player team found.",
            }, this);
        }

        private string GetMessage(string key, BasePlayer player = null)
        {
            string userId = player?.UserIDString;
            return lang.GetMessage(key, this, userId);
        }
        #endregion


        #region Saved Data
        private void OnServerSave()
        {
            if (!dataChanged) return;
            SaveData();
        }

        private bool dataChanged = false;
        private const string FILE_LEADER_PRIORITY = "TeamLeaderOnline/LeaderPriority";

        private void SaveData()
        {
            dataChanged = false;
            WriteObject(FILE_LEADER_PRIORITY, leaderPriority);
        }

        private void LoadData()
        {
            leaderPriority = ReadObject<Dictionary<ulong, ulong>>(FILE_LEADER_PRIORITY);
        }

        private void WriteObject<T>(string name, T value)
        {
            Interface.Oxide.DataFileSystem.WriteObject<T>(name, value);
        }

        private T ReadObject<T>(string name)
        {
            return Interface.Oxide.DataFileSystem.ReadObject<T>(name);
        }
        #endregion


        #region Hooks
        private void OnPlayerConnected(BasePlayer player)
        {
            var team = player?.Team;
            if (team == null || player.userID == team.teamLeader) return;
            if (!HasPriorityLeader(team.teamID) && HasPerm_Claim(player))
                PrintToChat(player, GetMessage("Claim.Suggest", player));
            if (!IsLeaderOnline(team) || IsPriorityLeader(team.teamID, player.userID))
                team.SetTeamLeader(player.userID);
        }

        private void OnPlayerDisconnected(BasePlayer player, string reason)
        {
            var team = player?.Team;
            if (team == null || player.userID != team.teamLeader) return;
            var teammate = GetEligibleOnlineTeammate(team);
            if (teammate == null) return;
            team.SetTeamLeader(teammate.userid);
        }

        private void OnTeamCreated(BasePlayer player, RelationshipManager.PlayerTeam team)
        {
            if (player == null || team == null) return;
            SetPriorityLeader(team.teamID, player.userID);
        }

        private void OnTeamDisbanded(RelationshipManager.PlayerTeam team)
        {
            if (team == null) return;
            RemovePriorityLeader(team.teamID);
        }


        private Dictionary<ulong, ulong> oldTeamLeaders = new Dictionary<ulong, ulong>();
        private void OnTeamMemberPromote(RelationshipManager.PlayerTeam team, ulong newLeaderID)
        {
            if (team == null) return;
            oldTeamLeaders[team.teamID] = team.teamLeader;
            Interface.Oxide.NextTick(() => {
                if (team == null) return;
                ulong oldLeaderID;
                if (!oldTeamLeaders.TryGetValue(team.teamID, out oldLeaderID) || team.teamLeader == oldLeaderID || team.teamLeader != newLeaderID) return;
                var oldLeader = BasePlayer.activePlayerList.FirstOrDefault((x) => (x != null && x.userID == oldLeaderID));
                if (oldLeader == null || !oldLeader.IsConnected || !IsPriorityLeader(team.teamID, oldLeaderID)) return;
                SetPriorityLeader(team.teamID, newLeaderID);
            });
        }

        private object OnTeamKick(RelationshipManager.PlayerTeam team, BasePlayer initiator, ulong targetId)
        {
            return IsPriorityLeader(team.teamID, targetId) ? true : null;
        }

        private void OnTeamLeave(RelationshipManager.PlayerTeam team, BasePlayer player)
        {
            if (team == null || player == null) return;
            if (IsPriorityLeader(team.teamID, player.userID))
                RemovePriorityLeader(team.teamID);
        }
        #endregion


        #region Leader Priority
        private Dictionary<ulong, ulong> leaderPriority = new();
        private void SetPriorityLeader(ulong teamId, ulong leaderId)
        {
            leaderPriority[teamId] = leaderId;
            dataChanged = true;
        }

        private void RemovePriorityLeader(ulong teamId)
        {
            if (!leaderPriority.Remove(teamId)) return;
            dataChanged = true;
        }

        private bool HasPriorityLeader(ulong teamId)
        {
            return leaderPriority.ContainsKey(teamId);
        }

        private bool IsPriorityLeader(ulong teamId, ulong userId)
        {
            ulong priorityLeaderId;
            return leaderPriority.TryGetValue(teamId, out priorityLeaderId) && (userId == priorityLeaderId);
        }
        #endregion


        #region Helpers
        private bool IsLeaderOnline(RelationshipManager.PlayerTeam team)
        {
            var members = team.GetOnlineMemberConnections();
            return members != null && members.Exists((x) => x.userid == team.teamLeader && x.connected);
        }

        private Network.Connection GetEligibleOnlineTeammate(RelationshipManager.PlayerTeam team)
        {
            var members = team.GetOnlineMemberConnections();
            if (members == null) return null;
            return members.Find((x) => x != null && x.connected && x.userid != team.teamLeader);
        }
        #endregion
    }
}