// huffware script: particle projector, by fred huffhines.
//
// takes a texture from one side of the object and projects it in a forward X and upward Z direction.
//
// this script is licensed by the GPL v3 which is documented at: http://www.gnu.org/licenses/gpl.html
// do not use it in objects without fully realizing you are implicitly accepting that license.
//

// constants that can be modified for different behavior.
 
float TEXTURE_DISPLAY_LIFE_SPAN = 14.0;  // how long the texture should be shown.

integer SIDE_TO_ACQUIRE_TEXTURE_FROM = 1;  // which side of the object should give us our display texture?

float MAGNIFIER = 4.0;  // how much to expand the texture as it runs.

vector TEXTURE_ACCELERATION = <0.02, 0.0, 0.01>;  // change in speed of the texture over time.

// global variables used in the script.

string texture_to_display = "95c7bb7c-d777-26b1-4052-acd778bfcb40";  // a simple default texture.

// displays a particle system with a texture that gradually enlarges over the object.
texture_hallucination()
{
    // get a bounding box around the object.
    list bounds = llGetBoundingBox(llGetKey());
    // calculate the size of the object, which will be our starting particle size.
    vector size = (vector)llList2String(bounds, 1) - (vector)llList2String(bounds, 0);
    float chosen_dimension = size.x;
    if (size.y > chosen_dimension) chosen_dimension = size.y;
    if (size.z > chosen_dimension) chosen_dimension = size.z;
    llParticleSystem([
        // properties regarding the generated particles.
        PSYS_PART_FLAGS, PSYS_PART_BOUNCE_MASK | PSYS_PART_INTERP_SCALE_MASK,
        PSYS_PART_START_SCALE, <chosen_dimension, chosen_dimension, 0.0>,
        PSYS_PART_END_SCALE, <chosen_dimension * MAGNIFIER, chosen_dimension * MAGNIFIER, 0.0>,
        PSYS_PART_MAX_AGE, TEXTURE_DISPLAY_LIFE_SPAN,
        PSYS_PART_START_COLOR, <1.0, 1.0, 1.0>,
        PSYS_PART_END_COLOR, <1.0, 1.0, 1.0>,
        PSYS_PART_START_ALPHA, 1.0,
        PSYS_PART_END_ALPHA, 1.0,
        // properties for the particle system's source.
        PSYS_SRC_MAX_AGE, TEXTURE_DISPLAY_LIFE_SPAN,
        PSYS_SRC_TEXTURE, texture_to_display,
        PSYS_SRC_ACCEL, TEXTURE_ACCELERATION,
        PSYS_SRC_PATTERN, PSYS_SRC_PATTERN_DROP,
        PSYS_SRC_BURST_PART_COUNT, 1,
        PSYS_SRC_BURST_RADIUS, chosen_dimension,
        PSYS_SRC_BURST_RATE, TEXTURE_DISPLAY_LIFE_SPAN,
        PSYS_SRC_BURST_SPEED_MIN, 0.01,
        PSYS_SRC_BURST_SPEED_MAX, 0.01,
        PSYS_SRC_ANGLE_BEGIN, 0.0,
        PSYS_SRC_ANGLE_END, 0.0,
        PSYS_SRC_OMEGA, <0.0, 0.0, 0.0>
    ]);
}

// from hufflets...

// returns a number at most "maximum" and at least "minimum".
// if "allow_negative" is TRUE, then the return may be positive or negative.
float randomize_within_range(float minimum, float maximum, integer allow_negative)
{
    if (minimum > maximum) {
        // flip the two if they are reversed.
        float temp = minimum; minimum = maximum; maximum = temp;
    }
    float to_return = minimum + llFrand(maximum - minimum);
    if (allow_negative) {
        if (llFrand(1.0) < 0.5) to_return *= -1.0;
    }
    return to_return;
}

//////////////
// huffware script: auto-retire, by fred huffhines, version 2.5.
// distributed under BSD-like license.
//   !!  keep in mind that this code must be *copied* into another
//   !!  script that you wish to add auto-retirement capability to.
// when a script has auto_retire in it, it can be dropped into an
// object and the most recent version of the script will destroy
// all older versions.
//
// the version numbers are embedded into the script names themselves.
// the notation for versions uses a letter 'v', followed by two numbers
// in the form "major.minor".
// major and minor versions are implicitly considered as a floating point
// number that increases with each newer version of the script.  thus,
// "hazmap v0.1" might be the first script in the "hazmap" script continuum,
// and "hazmap v3.2" is a more recent version.
//
// example usage of the auto-retirement script:
//     default {
//         state_entry() {
//            auto_retire();  // make sure newest addition is only version of script.
//        }
//     }
// this script is partly based on the self-upgrading scripts from markov brodsky
// and jippen faddoul.
//////////////
auto_retire() {
    string self = llGetScriptName();  // the name of this script.
    list split = compute_basename_and_version(self);
    if (llGetListLength(split) != 2) return;  // nothing to do for this script.
    string basename = llList2String(split, 0);  // script name with no version attached.
    string version_string = llList2String(split, 1);  // the version found.
    integer posn;
    // find any scripts that match the basename.  they are variants of this script.
    for (posn = llGetInventoryNumber(INVENTORY_SCRIPT) - 1; posn >= 0; posn--) {
//log_it("invpo=" + (string)posn);
        string curr_script = llGetInventoryName(INVENTORY_SCRIPT, posn);
        if ( (curr_script != self) && (llSubStringIndex(curr_script, basename) == 0) ) {
            // found a basic match at least.
            list inv_split = compute_basename_and_version(curr_script);
            if (llGetListLength(inv_split) == 2) {
                // see if this script is more ancient.
                string inv_version_string = llList2String(inv_split, 1);  // the version found.
                // must make sure that the retiring script is completely the identical basename;
                // just matching in the front doesn't make it a relative.
                if ( (llList2String(inv_split, 0) == basename)
                    && ((float)inv_version_string < (float)version_string) ) {
                    // remove script with same name from inventory that has inferior version.
                    llRemoveInventory(curr_script);
                }
            }
        }
    }
}
//
// separates the base script name and version number.  used by auto_retire.
list compute_basename_and_version(string to_chop_up)
{
    // minimum script name is 2 characters plus a version.
    integer space_v_posn;
    // find the last useful space and 'v' combo.
    for (space_v_posn = llStringLength(to_chop_up) - 3;
        (space_v_posn >= 2) && (llGetSubString(to_chop_up, space_v_posn, space_v_posn + 1) != " v");
        space_v_posn--) {
        // look for space and v but do nothing else.
//log_it("pos=" + (string)space_v_posn);
    }
    if (space_v_posn < 2) return [];  // no space found.
//log_it("space v@" + (string)space_v_posn);
    // now we zoom through the stuff after our beloved v character and find any evil
    // space characters, which are most likely from SL having found a duplicate item
    // name and not so helpfully renamed it for us.
    integer indy;
    for (indy = llStringLength(to_chop_up) - 1; indy > space_v_posn; indy--) {
//log_it("indy=" + (string)space_v_posn);
        if (llGetSubString(to_chop_up, indy, indy) == " ") {
            // found one; zap it.  since we're going backwards we don't need to
            // adjust the loop at all.
            to_chop_up = llDeleteSubString(to_chop_up, indy, indy);
//log_it("saw case of previously redundant item, aieee.  flattened: " + to_chop_up);
        }
    }
    string full_suffix = llGetSubString(to_chop_up, space_v_posn, -1);
    // ditch the space character for our numerical check.
    string chop_suffix = llGetSubString(full_suffix, 1, llStringLength(full_suffix) - 1);
    // strip out a 'v' if there is one.
    if (llGetSubString(chop_suffix, 0, 0) == "v")
        chop_suffix = llGetSubString(chop_suffix, 1, llStringLength(chop_suffix) - 1);
    // if valid floating point number and greater than zero, that works for our version.
    string basename = to_chop_up;  // script name with no version attached.
    if ((float)chop_suffix > 0.0) {
        // this is a big success right here.
        basename = llGetSubString(to_chop_up, 0, -llStringLength(full_suffix) - 1);
        return [ basename, chop_suffix ];
    }
    // seems like we found nothing useful.
    return [];
}
//
//////////////

default
{
    state_entry() { if (llSubStringIndex(llGetObjectName(),  "huffotronic") < 0) state real_default; }
    on_rez(integer parm) { state rerun; }
}
state rerun { state_entry() { state default; } }

state real_default {
    state_entry() {
        auto_retire();
    }

    touch_start(integer touch_count) {
        integer count = llGetInventoryNumber(INVENTORY_TEXTURE);
        if (count > 0) {
            // try getting a texture out of inventory.
            integer which_texture = llRound(randomize_within_range(0, count - 1, FALSE));
            texture_to_display = llGetInventoryName(INVENTORY_TEXTURE, which_texture);
//if (texture_to_display == "") llOwnerSay("fail!  got bad index from random.");
        } else {
            // if none in inventory, load the texture to show from our side.
            texture_to_display = llGetTexture(SIDE_TO_ACQUIRE_TEXTURE_FROM);
        }
//llOwnerSay("texture is now: " + texture_to_display);
        texture_hallucination();
        llSetTimerEvent(TEXTURE_DISPLAY_LIFE_SPAN + 0.1);
    }

    timer() {
        llParticleSystem([]);  // zap it back out again.
        llSetTimerEvent(0);  // turn off timer.
    }
}