/**
    i_battle

    Include file with general purpose scripts for the battle kit

    J.D. Robertson, 2002
*/
#include "prc_inc_spells"

// Like TooFarFrom, but specify the object
int TooFarFromO(object obj, float distance = 8.0)
{
    return GetArea(OBJECT_SELF) != GetArea(obj) ||
           (GetDistanceToObject(obj) > distance);
}

// Returns TRUE if the character is too far from the given waypoint. Note
// that being in a different area is automatically too far away
// TODO: Change the default value of distance (8.0) to whatever works for your module
int TooFarFrom(string waypoint, float distance = 8.0)
{
    object wp = GetNearestObjectByTag(waypoint);
    return TooFarFromO(wp);
}

// Keeps the character from falling below k_MIN_HITPOINTS hit points
void DisallowDeath()
{
    int hp = GetCurrentHitPoints();
    int k_MIN_HITPOINTS = 60; //TODO: Tweak this value as needed for you scritps
    if (hp < k_MIN_HITPOINTS)
        ApplyEffectToObject(DURATION_TYPE_INSTANT, EffectHeal(k_MIN_HITPOINTS - hp), OBJECT_SELF);
}

// A battle is running in the current area
int InBattle()
{
    return GetLocalInt(GetArea(OBJECT_SELF), "BattleStarted") &&
           !GetLocalInt(GetArea(OBJECT_SELF), "BattleFinished");
}

// Calculates the distance between two vectors in 3 dimensions. Allows
// catapults to work with hills
float Get3DDistance(vector v1, vector v2)
{
    return sqrt((v2.x - v1.x) * (v2.x - v1.x) +
                (v2.y - v1.y) * (v2.y - v1.y) +
                (v2.z - v1.z) * (v2.z - v1.z));
}

// Applies damage from a catapult hit. This gets around the fact that a catupult
// has a caster level of 0, so its fireballs do 0d6 damage.
void ApplyDamage(vector center)
{
    // Using GetFirstObjectInShape crashes the game (I think when the shape
    // crosses into an invalid area. Instead, use GetFirstObjectInArea
    // and check distances
    object hit = GetFirstObjectInArea();
    while (GetIsObjectValid(hit))
    {
        // Damage in a 5m radius sphere
        if ((OBJECT_TYPE_CREATURE == GetObjectType(hit)) &&   // TODO: Currently only damages creatures (for speed). Remove this line to damage placeables as well
            (Get3DDistance(center, GetPosition(hit)) < 10.0)) // TODO: This is the blast radius, feel free to tweak it
        {
            // Damage minus a reflex save
            int damage = d10(); // TODO: Change this value to whatever you want
            damage = PRCGetReflexAdjustedDamage(damage, hit, 14, SAVING_THROW_TYPE_FIRE);

            // Hit 'em
            ApplyEffectToObject(DURATION_TYPE_INSTANT,
                                EffectDamage(damage, DAMAGE_TYPE_FIRE),
                                hit);
        }

        hit = GetNextObjectInArea();
    }
}

// Causes the calling object to fire a catapult shell towards the waypoint
// named XTarget, where X is the calling object's tag
void FireCatapult()
{
    // Offset somewhere from the center of the battle
    // TODO: Adjust the offsets to increase or decrease the area in which
    // blasts will land
    // NOTE: 2d20 = [1,40], - 20 gives [-19, 20]
    vector center = GetPosition(GetNearestObjectByTag(GetTag(OBJECT_SELF) + "Target"));
    center.x += d20(2) - 20; // +- 20m from the target wapoint
    center.y += d20(2) - 20; // +- 20m from the target wapoint

    // Get the target, and calculate the distance so we can estimate delay
    // TODO: This is just a guess. It doesn't always work correctly, especially over
    // short distances. Feel free to adjust the delay to make things work correctly for you.
    location target = Location(OBJECT_SELF, center, 180.0);
    float delay = Get3DDistance(GetPosition(OBJECT_SELF), center) / 10.0;

    // Fire!
    ActionDoCommand(ActionCastSpellAtLocation(SPELL_FIREBALL, target, METAMAGIC_ANY,
                                              TRUE, PROJECTILE_PATH_TYPE_BALLISTIC));
    DelayCommand(delay, ApplyDamage(center));
}