using Microsoft.Xna.Framework;
using System.Collections.Generic;
using System.Linq;

namespace Barotrauma
{
    class MonsterMission : Mission
    {
        private string monsterFile;

        private int state;

        private int monsterCount;

        private readonly List<Character> monsters = new List<Character>();
        private readonly List<Vector2> sonarPositions = new List<Vector2>();

        public override IEnumerable<Vector2> SonarPositions
        {
            get
            {
                return sonarPositions;
            }
        }

        public MonsterMission(MissionPrefab prefab, Location[] locations)
            : base(prefab, locations)
        {
            monsterFile = prefab.ConfigElement.GetAttributeString("monsterfile", "");
            monsterCount = prefab.ConfigElement.GetAttributeInt("monstercount", 1);
        }

        public override void Start(Level level)
        {
            Level.Loaded.TryGetInterestingPosition(true, Level.PositionType.MainPath, Level.Loaded.Size.X * 0.3f, out Vector2 spawnPos);

            //bool isClient = GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient;
            //for (int i = 0; i < monsterCount; i++)
            //{
            //    monsters.Add(Character.Create(monsterFile, spawnPos, ToolBox.RandomSeed(8), null, isClient, true, false));
            //}
            //monsters.ForEach(m => m.Enabled = false);
            //SwarmBehavior.CreateSwarm(monsters.Cast<AICharacter>());
            //sonarPositions.Add(spawnPos);

            float offsetAmount = 500;
            for (int i = 0; i < monsterCount; i++)
            {
                CoroutineManager.InvokeAfter(() =>
                {
                    bool isClient = GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient;
                    var monster = Character.Create(monsterFile, spawnPos + Rand.Vector(offsetAmount, Rand.RandSync.Server), i.ToString(), null, isClient, true, true);
                    monster.Enabled = false;
                    monsters.Add(monster);
                    if (monsters.Count == monsterCount)
                    {
                        //this will do nothing if the monsters have no swarm behavior defined, 
                        //otherwise it'll make the spawned characters act as a swarm
                        SwarmBehavior.CreateSwarm(monsters.Cast<AICharacter>());
                        sonarPositions.Add(spawnPos);
                    }
                }, Rand.Range(0f, monsterCount / 2, Rand.RandSync.Server));
            }
        }

        public override void Update(float deltaTime)
        {
            switch (state)
            {
                case 0:
                    sonarPositions.Clear();
                    var activeMonsters = monsters.Where(m => m != null && !m.Removed && !m.IsDead);
                    if (activeMonsters.Any())
                    {
                        Vector2 centerOfMass = Vector2.Zero;
                        foreach (var monster in activeMonsters)
                        {
                            //don't add another label if there's another monster roughly at the same spot
                            if (sonarPositions.All(p => Vector2.DistanceSquared(p, monster.Position) > 1000.0f * 1000.0f))
                            {
                                sonarPositions.Add(monster.Position);
                            }
                        }
                    }


                    if (activeMonsters.Any()) { return; }
#if CLIENT
                    ShowMessage(state);
#endif
                    state = 1;
                    break;
            }
        }
        
        public override void End()
        {
            if (!monsters.All(m => m.Removed || m.IsDead)) { return; }
                        
            GiveReward();
            completed = true;
        }
    }
}