/*
 * Author: commy2 and CAA-Picard
 *
 * Calculate and apply backblast damage to potentially affected local units
 *
 * Argument:
 * 0: Unit that fired (Object)
 * 1: Pos ASL of the projectile (Array)
 * 2: Direction of the projectile (Array)
 * 3: Weapon fired (String)
 *
 * Return value:
 * None
 */
#include "script_component.hpp"

EXPLODE_4_PVT(_this,_firer,_posASL,_direction,_weapon);

private ["_overpressureAngle", "_overpressureRange", "_overpressureDamage"];

_overpressureAngle = getNumber (configFile >> "CfgWeapons" >> _weapon >> QGVAR(angle)) / 2;
_overpressureRange = getNumber (configFile >> "CfgWeapons" >> _weapon >> QGVAR(range));
_overpressureDamage = getNumber (configFile >> "CfgWeapons" >> _weapon >> QGVAR(damage));

TRACE_4("Parameters:",_overpressureAngle,_overpressureRange,_overpressureDamage,_weapon);

private "_pos";
_pos = _posASL;
if (!surfaceIsWater _pos) then {
    _pos = ASLtoATL _pos;
};

{
    if (local _x && {_x != _firer} && {vehicle _x == _x}) then {
        private ["_targetPositionASL", "_relativePosition", "_axisDistance", "_distance", "_angle", "_line", "_line2"];

        _targetPositionASL = eyePos _x;
        _relativePosition = _targetPositionASL vectorDiff _posASL;
        _axisDistance = _relativePosition vectorDotProduct _direction;
        _distance = vectorMagnitude _relativePosition;
        _angle = acos (_axisDistance / _distance);

        _line = [_posASL, _targetPositionASL, _firer, _x];
        _line2 = [_posASL, _targetPositionASL];
        TRACE_4("Affected:",_x,_axisDistance,_distance,_angle);

        if (_angle < _overpressureAngle && {_distance < _overpressureRange} && {!lineIntersects _line} && {!terrainIntersectASL _line2}) then {
            private ["_alpha", "_beta", "_damage"];

            _alpha = sqrt (1 - _distance / _overpressureRange);
            _beta = sqrt (1 - _angle / _overpressureAngle);

            _damage = 2 * _alpha * _beta * _overpressureDamage;

            // If the target is the ACE_player
            if (_x == ACE_player) then {[_damage * 100] call BIS_fnc_bloodEffect};

            // TODO: Sort this interaction with medical
            if (isClass (configFile >> "CfgPatches" >> "ACE_Medical")) then {
                [_x, "HitBody", ([_x, "", (_x getHitPointDamage "HitBody") + _damage, objNull, objNull] call EFUNC(medical,handleDamage))] call EFUNC(medical,setHitPointDamage);
                _x spawn {
                    sleep 0.5;
                    [_this, "", 0, objNull, objNull] call EFUNC(medical,handleDamage);
                };
            } else {
                _x setDamage (damage _x + _damage);
            };
        };
    };
} forEach (_pos nearEntities ["CAManBase", _overpressureRange]);