MissionExample (Hitman)

    bool MissionIsRunning = false;
    Vector3 MissionTrigger = Vector3.Zero;

    int EnemyRLGroup = World.AddRelationshipGroup("enemies");
    List<Ped> Guards = new List<Ped>(); //The list of peds that will guard the Target ped.
    Ped Target = null; //The target ped itself.
    Ped Companion = null; //Your companion.
    int Reward = 5000;
    Vector3 Location = Vector3.Zero;

    void OnTick(object sender, EventArgs e)
    {
        if (MissionIsRunning)
        {
            HandleMission();
        }
        else
        {
            if (Game.Player.Character.IsInRangeOf(MissionTrigger, 2f))
            {
                SetupMission();
            }
        }
    }

    void SetupMission()
    {
        //Set relationships
        World.SetRelationshipBetweenGroups(Relationship.Hate, Game.GenerateHash("PLAYER"), EnemyRLGroup);
        World.SetRelationshipBetweenGroups(Relationship.Hate, EnemyRLGroup, Game.GenerateHash("PLAYER"));

        //Create the Target
        Target = World.CreateRandomPed(Location);

        Target.AlwaysKeepTask = true;
        Target.RelationshipGroup = EnemyRLGroup;
        Target.Weapons.Give(WeaponHash.Bat, -1, true, true);
        Target.Task.WanderAround(Location, 4f);


        //Create the Guards
        int NumberOfGuards = 4;
        for (int i = 0; i < NumberOfGuards; i++)
        {
            Ped p = World.CreateRandomPed(Location.Around(3));

            p.AlwaysKeepTask = true;
            p.RelationshipGroup = EnemyRLGroup;
            p.Weapons.Give(WeaponHash.Pistol, 90, true, true);
            p.Task.WanderAround(Location, 5f);

            Guards.Add(p);
        }

        //Create the companion
        Companion = World.CreateRandomPed(Game.Player.Character.Position.Around(3f));
        Companion.AlwaysKeepTask = true;
        Companion.RelationshipGroup = Game.GenerateHash("PLAYER");
        Companion.Task.FollowToOffsetFromEntity(Game.Player.Character, Game.Player.Character.ForwardVector * -1, 2f, -1, 2f, true); //Make the companion follow the player

        UI.ShowSubtitle("~b~[Contact]~w~: Kill the guy located in "+World.GetStreetName(Location)+".", 6000);
        MissionIsRunning = true;
    }
    void HandleMission()
    {
        //Win conditions
        if (Target.IsDead)
        {
            Game.Player.Money += Reward;
            UI.Notify("~g~Mission completed.");
            CleanMissionEntities();
            MissionIsRunning = false;
            return;
        }

        //Fail conditions
        if (Game.Player.IsDead)
        {
            UI.Notify("~r~Mission failed.");
            CleanMissionEntities();
            MissionIsRunning = false;
            return;
        }

        //^ We always RETURN whenever the mission has ended, to make sure the mission doesn't get processed anymore.
        //If you won/failed, there's no point if checking anything mission-specific anymore.


   //Handle the entities
        //Teleport the companion near the player if its too far away (lost)
        if (Companion.Exists() && Companion.IsAlive && Companion.IsInRangeOf(Game.Player.Character.Position, 50f))
        {
            Companion.Position = Game.Player.Character.Position.Around(2f);
        }

        //For the sake of examples, we'll make an excuse to handle the target, make them flee if you're nearby and armed with an RPG.
        if(!Target.IsFleeing && Game.Player.Character.IsInRangeOf(Target.Position, 40f) && Game.Player.Character.Weapons.Current.Hash == WeaponHash.RPG)
        {
            //This bit only will be applied if the target is NOT fleeing yet, and because we task them to flee, "IsFleeing" will remain true forever, preventing this from triggering again.
            //So we can put here stuff that will only happen ONCE, when the Target starts fleeing.
            //Like a subtitle emulating the Target's vocal reaction.

            UI.ShowSubtitle("~r~[Target]:~w~ WHAT THE FUCK, DUDE", 3000);
            Target.Task.FleeFrom(Game.Player.Character, -1);
        }
    }

//This function will make sure all entities are removed from your control, and left to be despawned by the game.
//You can force an immediate deletion by replacing 'MarkAsNoLongerNeeded()' with 'Delete()'.
    void CleanMissionEntities()
    {
        if (Target.Exists()) Target.MarkAsNoLongerNeeded();

        foreach (Ped p in Guards)
        {
            if (p.Exists()) p.MarkAsNoLongerNeeded();
        }

        if (Companion.Exists()) Companion.MarkAsNoLongerNeeded();
    }