#include sdktools
#include sdkhooks

#define TEAM_SURVIVORS  2
#define TEAM_INFECTED   3

Handle distance, Fling, FlingDamage;

new Handle:sdkCallPushPlayer = INVALID_HANDLE;
new Handle:GameConf = INVALID_HANDLE;

public OnPluginStart()
{
    distance    = CreateConVar("sv_rang_rock_stun", "400.0", "", FCVAR_NONE);
    Fling    = CreateConVar("sv_power_rock_of_fling", "450.0", "", FCVAR_NONE);
    FlingDamage    = CreateConVar("sv_rock_damage_fling", "1", "", FCVAR_NONE);

    GameConf = LoadGameConfigFile("l4d2_detonationforce");

    StartPrepSDKCall(SDKCall_Player);
    PrepSDKCall_SetFromConf(GameConf, SDKConf_Signature, "CTerrorPlayer_Fling");
    PrepSDKCall_AddParameter(SDKType_Vector, SDKPass_ByRef);
    PrepSDKCall_AddParameter(SDKType_PlainOldData, SDKPass_Plain);
    PrepSDKCall_AddParameter(SDKType_CBasePlayer, SDKPass_Pointer);
    PrepSDKCall_AddParameter(SDKType_Float, SDKPass_Plain);
    sdkCallPushPlayer = EndPrepSDKCall();

    CloseHandle(GameConf);

}

public OnEntityDestroyed(entity)
{
    if(IsValidEntity(entity) && IsValidEdict(entity))
    {
        decl String:g_classname[20];
        GetEdictClassname(entity, g_classname, 20);
        if(StrEqual(g_classname, "tank_rock", true) && GetEntProp(entity, Prop_Send, "m_iTeamNum")>=0)
        {
            for(int i = 1; i <= MaxClients; ++i)
            {
                if(bIsSurvivor(i))
                {
                    float fDamagerPos[3], fDangerPos[3];
                    GetEntPropVector(entity, Prop_Send, "m_vecOrigin", fDamagerPos);
                    GetEntPropVector(i, Prop_Send, "m_vecOrigin", fDangerPos);
                    float fTargetDistance = GetVectorDistance(fDamagerPos, fDangerPos);
                    if (fTargetDistance > GetConVarFloat(distance)) continue;

                    Fly(entity, i, GetConVarFloat(Fling))
                    DamageEffect(i, GetConVarInt(FlingDamage))
                }
            }
        }
    }
}

public Fly(explosion, target, Float:power)
{
    if(target <= 0 || !IsValidEntity(target) || !IsValidEdict(target))  // check if the taget is a valid entity
        return;

    decl Float:targetPos[3], Float:explosionPos[3], Float:traceVec[3], Float:resultingFling[3];

    /* getting the target and explosion position */

    GetEntPropVector(target, Prop_Data, "m_vecOrigin", targetPos);
    GetEntPropVector(explosion, Prop_Data,"m_vecOrigin", explosionPos);

    power = power - GetVectorDistance(targetPos,explosionPos);  // an easy way to define the explosion power, is the "base power" minus the distance between the target and the explosion

    if(power < 1)       // if the power is irrelevant, doesn't worth to continue
        return;

    /* getting the resulting */

    MakeVectorFromPoints(explosionPos, targetPos, traceVec);
    GetVectorAngles(traceVec, resultingFling);

    resultingFling[0] = Cosine(DegToRad(resultingFling[1])) * power;
    resultingFling[1] = Sine(DegToRad(resultingFling[1])) * power;
    resultingFling[2] = power + (power * 0.5);

    /* for L4D 2 */
    if (GetClientTeam(target) == TEAM_SURVIVORS)
    {
        SDKCall(sdkCallPushPlayer, target, resultingFling, 76, target, 2.0);// throwing survivor with animation 76 (charge animation)
    }
    else
    if (GetClientTeam(target) == TEAM_INFECTED)
    {
        SDKCall(sdkCallPushPlayer, target, resultingFling, 2, target, 2.0);// throwing infected with animation 2 (jump animation)
    }

}

public DamageEffect(target, damage)
{
    decl String:sDamage[12];
    IntToString(damage, sDamage, sizeof(sDamage));          // converting the damage from int to string

    new pointHurt = CreateEntityByName("point_hurt");       // Create point_hurt
    DispatchKeyValue(target, "targetname", "hurtme");       // mark target
    DispatchKeyValue(pointHurt, "Damage", sDamage);         // Set damage
    DispatchKeyValue(pointHurt, "DamageTarget", "hurtme");  // Target Assignmen
    DispatchKeyValue(pointHurt, "DamageType", "65536");
    DispatchSpawn(pointHurt);                               // Spawn descriped point_hurt
    AcceptEntityInput(pointHurt, "Hurt");                   // Trigger point_hurt execute
    AcceptEntityInput(pointHurt, "Kill");                   // Remove point_hurt
    DispatchKeyValue(target, "targetname", "cake");         // Clear target's mark
}

stock bool bIsSurvivor(int client)
{
    return client > 0 && client <= MaxClients && IsClientInGame(client) && GetClientTeam(client) == 2 && !IsClientInKickQueue(client) && IsPlayerAlive(client);
}