#pragma semicolon 1
#pragma newdecls required

#include <sdktools>

#pragma tabsize 0

float GrenadeDamage = 5000.0;
float PipeBombDamage = 5000.0;
float BarrelDamage = 5000.0;

float GrenadeRadius = 660.0;
float PipeRadius = 660.0;
float BarrelRadius = 660.0;

float ShakeGrenade = 1320.0;
float ShakePipe = 1320.0;
float ShakeBarrel = 1320.0;

float PowerShakeG = 50.0;
float PowerShakeP = 50.0;
float PowerShakeB = 50.0;

bool IsAllow = false;

public void OnMapStart()
{
    IsAllow = false;
    CreateTimer(3.0, allow);
}

public Action allow(Handle timer)
{
    IsAllow = true;
}

public void OnEntityDestroyed(int entity)
{
    if(!IsAllow) return;

    if (IsValidEntity(entity) && IsValidEdict(entity))
    {
        char classname[128];
        GetEdictClassname(entity, classname, 128);
        if (StrEqual(classname, "grenade_launcher_projectile", false))
        {
            GrenadeTouch(entity);
        }
        if (StrEqual(classname, "pipe_bomb_projectile", false))
        {
            BombTouch(entity);
        }
        if (StrEqual(classname, "prop_fuel_barrel", false))
        {
            BarrelTouch(entity);
        }
    }
}

public int GrenadeTouch(int entity)
{
    float pos[3];
    GetEntPropVector(entity, view_as<PropType>(0), "m_vecOrigin", pos, 0);
    GranadeExplode(pos);
}

public int BombTouch(int entity)
{
    float pos[3];
    GetEntPropVector(entity, view_as<PropType>(0), "m_vecOrigin", pos, 0);
    BombExplode(pos);
}

public int BarrelTouch(int entity)
{
    float pos[3];
    GetEntPropVector(entity, view_as<PropType>(0), "m_vecOrigin", pos, 0);
    BarrelExplode(pos);
}

int GranadeExplode(float pos[3])
{
    float fDistance = 0.0;
    float pos2[3];
    for( int i = 0; i < 32; i++ )
    {
        if(IsValidClient(i) && GetClientTeam(i) == 2)
        {
            int vClass = GetEntProp(i, Prop_Send, "m_zombieClass");
            if(vClass == 9)
            {
                GetClientAbsOrigin(i, pos2);
                fDistance = GetVectorDistance(pos, pos2);
                if(fDistance < GrenadeRadius && IsVisibleTo(pos, pos2))
                {
                    float iOne = GrenadeRadius - fDistance;
                    float vForward = GrenadeRadius / iOne;
                    int iDamage = RoundToCeil(GrenadeDamage / (vForward * vForward * vForward));
                    ForceDamageEntity(i, iDamage, i);
                }
                if(fDistance < ShakeGrenade)
                {
                    float iOne = ShakeGrenade - fDistance;
                    float vForward = ShakeGrenade / iOne;
                    float iDamage = (PowerShakeG / (vForward * vForward * vForward)) * 1.0;
                    ScreenShake(i, iDamage);
                }
            }
        }
    }
}

int BombExplode(float pos[3])
{
    float fDistance = 0.0;
    float pos2[3];
    for( int i = 0; i < 32; i++ )
    {
        if(IsValidClient(i) && GetClientTeam(i) == 2)
        {
            int vClass = GetEntProp(i, Prop_Send, "m_zombieClass");
            if(vClass == 9)
            {
                GetClientAbsOrigin(i, pos2);
                fDistance = GetVectorDistance(pos, pos2);
                if(fDistance < PipeRadius && IsVisibleTo(pos, pos2))
                {
                    float iOne = PipeRadius - fDistance;
                    float vForward = PipeRadius / iOne;
                    int iDamage = RoundToCeil(PipeBombDamage / (vForward * vForward * vForward));
                    ForceDamageEntity(i, iDamage, i);
                }
                if(fDistance < ShakePipe)
                {
                    float iOne = ShakePipe - fDistance;
                    float vForward = ShakePipe / iOne;
                    float iDamage = (PowerShakeP / (vForward * vForward * vForward)) * 1.0;
                    ScreenShake(i, iDamage);
                }
            }
        }
    }
}

int BarrelExplode(float pos[3])
{
    float fDistance = 0.0;
    float pos2[3];
    for( int i = 0; i < 32; i++ )
    {
        if(IsValidClient(i) && GetClientTeam(i) == 2)
        {
            int vClass = GetEntProp(i, Prop_Send, "m_zombieClass");
            if(vClass == 9)
            {
                GetClientAbsOrigin(i, pos2);
                fDistance = GetVectorDistance(pos, pos2);
                if(fDistance < BarrelRadius && IsVisibleTo(pos, pos2))
                {
                    float iOne = BarrelRadius - fDistance;
                    float vForward = BarrelRadius / iOne;
                    int iDamage = RoundToCeil(BarrelDamage / (vForward * vForward * vForward));
                    ForceDamageEntity(i, iDamage, i);
                }
                if(fDistance < ShakeBarrel)
                {
                    float iOne = ShakeBarrel - fDistance;
                    float vForward = ShakeBarrel / iOne;
                    float iDamage = (PowerShakeB / (vForward * vForward * vForward)) * 1.0;
                    ScreenShake(i, iDamage);

                }
            }
        }
    }
}

public void ScreenShake(int target, float power)
{
    Handle msg;
    msg = StartMessageOne("Shake", target);
    BfWriteByte(msg, 0);
    BfWriteFloat(msg, power);
    BfWriteFloat(msg, 10.0);
    BfWriteFloat(msg, 3.0);
    EndMessage();
}

static bool IsVisibleTo(float position[3], float targetposition[3])
{
    float vAngles[3], vLookAt[3];

    MakeVectorFromPoints(position, targetposition, vLookAt);
    GetVectorAngles(vLookAt, vAngles);
    Handle trace = TR_TraceRayFilterEx(position, vAngles, MASK_SHOT, RayType_Infinite, _TraceFilter);

    bool isVisible = false;
    if (TR_DidHit(trace))
    {
        float vStart[3];
        TR_GetEndPosition(vStart, trace);
        if ((GetVectorDistance(position, vStart, false) + 25.0) >= GetVectorDistance(position, targetposition))
        {
            isVisible = true;
        }
    }

    return isVisible;
}

public bool _TraceFilter(int entity, int contentsMask)
{

}

stock void ForceDamageEntity(int causer, int damage, int victim) // thanks to &#36798;&#26031;*&#32500;&#36798;
{
    float victim_origin[3];
    char rupture[32];
    char damage_victim[32];
    IntToString(damage, rupture, sizeof(rupture));
    Format(damage_victim, sizeof(damage_victim), "hurtme%d", victim);
    GetEntPropVector(victim, Prop_Send, "m_vecOrigin", victim_origin);
    int entity = CreateEntityByName("point_hurt");
    DispatchKeyValue(victim, "targetname", damage_victim);
    DispatchKeyValue(entity, "DamageTarget", damage_victim);
    DispatchKeyValue(entity, "Damage", rupture);
    DispatchSpawn(entity);
    TeleportEntity(entity, victim_origin, NULL_VECTOR, NULL_VECTOR);
    AcceptEntityInput(entity, "Hurt", (causer > 0 && causer <= MaxClients) ? causer : -1);
    DispatchKeyValue(entity, "classname", "point_hurt");
    DispatchKeyValue(victim, "targetname", "null");
    AcceptEntityInput(entity, "Kill");
}

stock bool IsValidClient(int client)
{
    if ( client < 1 || client > MaxClients ) return false;
    if( !IsClientInGame(client)) return false;
    if ( !IsPlayerAlive( client )) return false;
    return true;
}