Basic stamina system

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This is something i've been meaning to create for a while but was busy deciding how i should handle this. Unfortunately (though not entirely), Amnesia uses an outdated version of AngelScript, so i had to rely on classes as a means of imitating namespaces. Likewise unfortunate, in AngelScript functions are taken as "read-only" and the engine doesn't look for member functions for what i was trying to do, so i couldn't create proxies for the AddTimer function by changing the "pointers" of functions to member functions.

Here is the code for the stamina system:

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const string STAMINA_TIMER_CALLBACK_NAME = "STAMINA_TIMER_CALLBACK";
const string STAMINA_PLAYER_SPEED = "STAMINA_PLAYER_SPEED";
const string STAMINA_PLAYER_LENGTH = "STAMINA_PLAYER_LENGTH";
const string STAMINA_PLAYER_BREATH_SLOW = "STAMINA_PLAYER_BREATH_SLOW";
const string STAMINA_PLAYER_BREATH_SNT = "react_breath_slow.snt";
const string STAMINA_PLAYER_HEAD_BOB = "STAMINA_PLAYER_HEAD_BOB";

const float STAMINA_TIMER_SPEED_TIME = 0.5f;
const float STAMINA_PLAYER_HEAD_BOB_SPEED = 0.7f;

enum StaminaStages
    {
        Full,
        Low,
        Exhausted
    }

class StaminaSystem
    {
        private int state;
        private uint length;
        private bool head_bobbing;
        private bool is_running;

        StaminaSystem()
            {
                PreloadSound(STAMINA_PLAYER_BREATH_SNT);
                this.state = StaminaStages::Full;
                this.length = 10;
                this.head_bobbing = false;
                this.is_running = false;
            }

        ~StaminaSystem()
            {
                this.Stop();
            }

        void AddDebugMessage(string &in message, bool check, bool to_file)
            {
                ::AddDebugMessage("Stamina system: " + message, check);
                if (to_file) Print("Stamina system: " + message);
            }

        bool IsPlayerRunning() const
            {
                return this.is_running;
            }

        void PlayBreathSound()
            {
                PlaySoundAtEntity(STAMINA_PLAYER_BREATH_SLOW, STAMINA_PLAYER_BREATH_SNT, "Player", 0, false);
            }

        void Start()
            {
                SetPlayerRunSpeedMul(1);
                SetPlayerMoveSpeedMul(1);
                AddTimer(STAMINA_PLAYER_SPEED, STAMINA_TIMER_SPEED_TIME, STAMINA_TIMER_CALLBACK_NAME);
            }

        void StartPlayerHeadBob()
            {
                if (this.head_bobbing)
                    MovePlayerHeadPos(0, -0.35, 0, STAMINA_PLAYER_HEAD_BOB_SPEED, 0.6);
                else
                    MovePlayerHeadPos(0, 0, 0, STAMINA_PLAYER_HEAD_BOB_SPEED, 0.6);

                this.head_bobbing = !this.head_bobbing;
                AddTimer(STAMINA_PLAYER_HEAD_BOB, 0.75f, STAMINA_TIMER_CALLBACK_NAME);
            }

        void StartPlayerTiredEffect()
            {
                this.PlayBreathSound();
                AddTimer(STAMINA_PLAYER_BREATH_SLOW, 1.5f, STAMINA_TIMER_CALLBACK_NAME);
            }

        void Stop()
            {
                this.StopPlayerTiredEffect();
                RemoveTimer(STAMINA_PLAYER_SPEED);
                RemoveTimer(STAMINA_PLAYER_LENGTH);
                SetPlayerRunSpeedMul(1);
                SetPlayerMoveSpeedMul(1);
                SetPlayerJumpDisabled(false);
            }

        void StopPlayerTiredEffect()
            {
                this.head_bobbing = false;
                RemoveTimer(STAMINA_PLAYER_BREATH_SLOW);
                RemoveTimer(STAMINA_PLAYER_HEAD_BOB);
                MovePlayerHeadPos(0,0,0, 1, 1);
                // StopSound(STAMINA_PLAYER_BREATH_SLOW, 1); // Crashes the game upon exit.
            }

        void SetStaminaLength(uint length)
            {
                if (length != 0)
                    this.length = length;
                else
                    this.AddDebugMessage("Length cannot be 0!", false, true);
            }

        void Update(string &in timer_name)
            {
                if (timer_name == STAMINA_PLAYER_SPEED)
                {
                    this.is_running = (GetPlayerSpeed() > 3) ? true : false;

                    if (this.is_running && GetTimerTimeLeft(STAMINA_PLAYER_LENGTH) == 0)
                        AddTimer(STAMINA_PLAYER_LENGTH, this.length, STAMINA_TIMER_CALLBACK_NAME);

                    else if(!this.is_running)
                    {
                        if (GetTimerTimeLeft(STAMINA_PLAYER_LENGTH) > 0 && this.state == StaminaStages::Full)
                            RemoveTimer(STAMINA_PLAYER_LENGTH);

                        else if(this.state == StaminaStages::Low)
                            AddTimer(STAMINA_PLAYER_LENGTH, this.length/4, STAMINA_TIMER_CALLBACK_NAME);

                        else if(this.state == StaminaStages::Exhausted)
                            AddTimer(STAMINA_PLAYER_LENGTH, this.length/2, STAMINA_TIMER_CALLBACK_NAME);
                    }

                    AddTimer(timer_name, STAMINA_TIMER_SPEED_TIME, STAMINA_TIMER_CALLBACK_NAME);
                }

                else if (timer_name == STAMINA_PLAYER_BREATH_SLOW)
                    this.StartPlayerTiredEffect();

                else if (timer_name == STAMINA_PLAYER_HEAD_BOB)
                    this.StartPlayerHeadBob();

                else if (timer_name == STAMINA_PLAYER_LENGTH)
                {
                    if (this.is_running)
                    {
                        if (this.state == StaminaStages::Full)
                        {
                            this.state++;
                            SetPlayerRunSpeedMul(0.3);
                        }

                        else if (this.state == StaminaStages::Low)
                        {
                            this.state++;
                            SetPlayerRunSpeedMul(0);
                            SetPlayerMoveSpeedMul(0);
                            SetPlayerJumpDisabled(true);
                            this.StartPlayerTiredEffect();
                            this.StartPlayerHeadBob();
                        }
                    }

                    else
                    {
                        this.StopPlayerTiredEffect();

                        SetPlayerRunSpeedMul(1);
                        SetPlayerMoveSpeedMul(1);
                        SetPlayerJumpDisabled(false);

                        if (this.state == StaminaStages::Low)
                            this.state = StaminaStages::Full;

                        else if (this.state == StaminaStages::Exhausted)
                            this.state = StaminaStages::Full;
                    }
                }
            }
    }

StaminaSystem stamina_obj;

void STAMINA_TIMER_CALLBACK(string &in timer_name)
    { stamina_obj.Update(timer_name); } 


• StaminaSystem:tate is the current "StaminaStage" of the player.
  
• StaminaSystem::length is the amount of time in seconds that the player is allowed to run for before entering a more exhausted state.
  
• StaminaSystem::is_running holds whether or not the player is understood to be "running." Use StaminaSystem::IsPlayerRunning() to access the variable outside of the class. (Note: StaminaSystem must have been started in order for this to return expected values.)
  
• StaminaSystem::head_bobbing is used to store a toggle state to determine which direction the player's head should move in.
  

The StaminaStages values should be self-explanatory.

When the player reaches the StaminaStages::Exhausted state, the player is prevented from moving for 1/2 the time of StaminaSystem::length; and when the player reaches StaminaStages::Low and is not running, 1/4 the time of StaminaSystem::length is required to regain full stamina.

To activate it for your map, having something as simple as this is enough:

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void OnEnter()
{
    stamina_obj.Start();
}

void OnLeave()
{
    stamina_obj.Stop();
} 


In action: