using System;
using UnityEngine;
using Newtonsoft.Json;

namespace Oxide.Plugins

{
    [Info("AdminChinook", "The_Kiiiing", "1.0.8")]
    [Description("Allows Admins to fly the Chinook")]

    public class AdminChinook : RustPlugin
    {
        #region Configuration

        private static Configuration _config;

        private class Configuration
        {
            [JsonProperty(PropertyName = "Time until heli despawn after last player dismounts (seconds)", ObjectCreationHandling = ObjectCreationHandling.Replace)]
            public float DESPAWN_TIME = 10f;
            [JsonProperty(PropertyName = "Time until heli despawn after spawn if no player mounts (seconds)", ObjectCreationHandling = ObjectCreationHandling.Replace)]
            public float INITIAL_DESPAWN_TIME = 20f;
            [JsonProperty(PropertyName = "Allow anyone to mount the heli", ObjectCreationHandling = ObjectCreationHandling.Replace)]
            public bool ANYONE_MOUNT = false;
        }

        protected override void LoadConfig()
        {
            base.LoadConfig();
            try
            {
                _config = Config.ReadObject<Configuration>();
                if (_config == null) throw new Exception();
                SaveConfig();
            }
            catch
            {
                PrintError("Your configuration file contains an error. Using default configuration values.");
                LoadDefaultConfig();
            }
        }

        private void Unload()
        {
            _config = null;
        }

        protected override void SaveConfig() => Config.WriteObject(_config);

        protected override void LoadDefaultConfig() => _config = new Configuration();

        #endregion

        #region Fields

        private static string CHINOOK_PREFAB = "assets/prefabs/npc/ch47/ch47.entity.prefab";
        private static string PERM_USE = "adminchinook.use";

        private const float SPAWN_DISTANCE = 5f;   //Distance between player and Chinook at spawn    

        #endregion

        #region Functions

        private void invokeDespawnTimer(CH47Helicopter ch, BasePlayer player)
        {
            ch.Invoke(() =>
            {
                if (!ch.IsDestroyed && !ch.AnyMounted()) ch.AdminKill();
            }, _config.DESPAWN_TIME);
        }

        #endregion

        #region Commands

        [ChatCommand("ch47")]
        void spawn(BasePlayer player)
        {
            if (!permission.UserHasPermission(player.UserIDString, PERM_USE))
            {
                player.ChatMessage("You don't have permission to do this");
                return;
            }

            Quaternion rot = Quaternion.Euler(0, player.GetNetworkRotation().eulerAngles.y + 270, 0);
            Vector3 pos = player.transform.position;
            Vector3 spawn_pos = pos + (rot * (player.transform.right * SPAWN_DISTANCE + player.transform.up));

            var heli = (CH47Helicopter)GameManager.server.CreateEntity(CHINOOK_PREFAB, pos, rot, true);
            heli.Spawn();
           
            heli.Invoke(() =>
            {
                if (!heli.IsDestroyed && !heli.AnyMounted()) heli.AdminKill();
            }, _config.INITIAL_DESPAWN_TIME);

            player.ChatMessage("Chinook has been spawned");
        }

        #endregion

        #region Oxide Hooks

        void Init()
        {
            permission.RegisterPermission(PERM_USE, this);
        }

        void OnEntityDismounted(BaseMountable entity, BasePlayer player)
        {
            var parent_entity = entity.GetParentEntity();
            if (parent_entity is CH47Helicopter)
            {
                invokeDespawnTimer(parent_entity as CH47Helicopter, player);
            }
        }

        object CanMountEntity(BasePlayer player, BaseMountable entity)
        {
            if (entity.GetParentEntity() is CH47Helicopter && !_config.ANYONE_MOUNT)
            {
                if (!permission.UserHasPermission(player.UserIDString, PERM_USE))
                {
                    player.ChatMessage("You don't have permission to do this");
                    return false;
                }
            }
            return null;
        }

        #endregion
    }
}