on init
    make_perfview
    set_ui_height_px(328-68)
    set_script_title("A Dodgy Oh!")

    //set_control_par_str($INST_WALLPAPER_ID, $CONTROL_PAR_PICTURE, "skin")
    set_control_par($INST_ICON_ID, $CONTROL_PAR_HIDE, $HIDE_WHOLE_CONTROL)

    {#pragma save_compiled_source violins_ens_legato_compiled.txt}

    {**********************************************************************
    * CONSTANTS *
    **********************************************************************}
    declare const TRUE := 1
    declare const FALSE := 0
    declare const NULL := -999
    //declare const HOLDTIME := 250000 // legato interval hold time in microseconds

    {**********************************************************************
    * VARIABLES *
    **********************************************************************}
    declare i
    declare articulation := 0 // currently selected articulation
    declare last_note := -1

    {**********************************************************************
    * ARRAYS *
    **********************************************************************}
    declare %note_ids[2] // to hold the note IDs we'll need for true legato

    {**********************************************************************
    * FAMILIES *
    **********************************************************************}
    family App
        declare const HIGH_NOTE := 127
        declare const LOW_NOTE := 1
        declare const REAL_CC := 102
    end family

    family Sets // we organize related groups into sets
        declare %sustains[2] := (3, 4) // sustain group ids
        declare %intervals[3] := (0) //, 1, 2) // interval group ids
        // declare staccatos := 4 // staccato group id
    end family

    {**********************************************************************
    * GUI *
    **********************************************************************}
    // * POSITIONING KNOBS *
    {declare ui_knob $knb_x (0, 650, 1)
    move_control_px($knb_x, 400, 0)
    declare ui_knob $knb_y (0, 650, 1)
    move_control_px($knb_y, 500, 0)}



    // declare ui_menu pers $mnu_cc // dynamics cc selection menu
    // set_control_help($mnu_cc, "Select a CC number to control sustain dynamics.")
    // move_control_px($mnu_cc, 316, 50)
    // set_control_par(get_ui_id($mnu_cc), $CONTROL_PAR_HEIGHT, 144/6)
    // //set_control_par_str(get_ui_id($mnu_cc), $CONTROL_PAR_PICTURE, "menu")

    {* LEGATO CONTROLS *}
    declare ui_switch pers $swi_legato_bypass // legato toggle button
    move_control_px($swi_legato_bypass, 170, 3)
    set_control_help($swi_legato_bypass, "Toggles the legato.")
    //set_control_par_str(get_ui_id($swi_legato_bypass), $CONTROL_PAR_PICTURE, "switch")
    set_control_par_str(get_ui_id($swi_legato_bypass), $CONTROL_PAR_TEXT, "Disable Legato")
    set_control_par(get_ui_id($swi_legato_bypass), $CONTROL_PAR_WIDTH, 100)
    //set_control_par(get_ui_id($swi_legato_bypass), $CONTROL_PAR_HEIGHT, 312/6)



    declare ui_slider pers $sli_offset(0, 1000000) // sustain sample offset slider: 0-1000ms
    move_control_px($sli_offset, 67, 70)
    //set_control_par_str(get_ui_id($sli_offset), $CONTROL_PAR_PICTURE, "knob")
    //set_control_par(get_ui_id($sli_offset), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)
    read_persistent_var($sli_offset)

    declare ui_label $lbl_offset(1, 1) // sustain offset control label
    move_control_px($lbl_offset, 118, 88)
    set_control_par(get_ui_id($lbl_offset), $CONTROL_PAR_WIDTH, 120)
    set_text($lbl_offset, "sustain offset: "&$sli_offset/1000)
    hide_part($lbl_offset, $HIDE_PART_BG) // hide label background
    set_control_par(get_ui_id($lbl_offset), $CONTROL_PAR_FONT_TYPE, 6)



    // declare ui_slider pers $sli_int_offset(0, 1000000) // interval sample offset slider: 0-1000ms
    // move_control_px($sli_int_offset, 67+150, 70)
    // //set_control_par_str(get_ui_id($sli_int_offset), $CONTROL_PAR_PICTURE, "knob")
    // //set_control_par(get_ui_id($sli_int_offset), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)
    // read_persistent_var($sli_int_offset)

    // declare ui_label $lbl_int_offset(1, 1) // interval offset control label
    // move_control_px($lbl_int_offset, 118+150, 88)
    // set_control_par(get_ui_id($lbl_int_offset), $CONTROL_PAR_WIDTH, 120)
    // set_text($lbl_int_offset, "interval offset: "&$sli_int_offset/1000)
    // hide_part($lbl_int_offset, $HIDE_PART_BG) // hide label background
    // set_control_par(get_ui_id($lbl_int_offset), $CONTROL_PAR_FONT_TYPE, 6)



    declare ui_slider pers $sli_fade(100000, 700000) // legato fadein time slider
    move_control_px($sli_fade, 67, 121)
    //set_control_par_str(get_ui_id($sli_fade), $CONTROL_PAR_PICTURE, "knob")
    //set_control_par(get_ui_id($sli_fade), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)
    read_persistent_var($sli_fade)

    declare ui_label $lbl_fade(1, 1) // legato fadein control label
    move_control_px($lbl_fade, 118, 138)
    set_control_par(get_ui_id($lbl_fade), $CONTROL_PAR_WIDTH, 120)
    set_text($lbl_fade, "fade in: "&$sli_fade/1000)
    hide_part($lbl_fade, $HIDE_PART_BG)
    set_control_par(get_ui_id($lbl_fade), $CONTROL_PAR_FONT_TYPE, 6)



    declare ui_slider pers $sli_fade_out(100000, 700000) // legato fadeout time slider
    move_control_px($sli_fade_out, 67, 121+50)
    //set_control_par_str(get_ui_id($sli_fade_out), $CONTROL_PAR_PICTURE, "knob")
    //set_control_par(get_ui_id($sli_fade_out), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)
    read_persistent_var($sli_fade_out)

    declare ui_label $lbl_fade_out(1, 1) // legato fadeout control label
    move_control_px($lbl_fade_out, 118, 138+50)
    set_control_par(get_ui_id($lbl_fade_out), $CONTROL_PAR_WIDTH, 120)
    set_text($lbl_fade_out, "fade out: "&$sli_fade_out/1000)
    hide_part($lbl_fade_out, $HIDE_PART_BG)
    set_control_par(get_ui_id($lbl_fade_out), $CONTROL_PAR_FONT_TYPE, 6)





    declare ui_slider pers $sli_holdtime(0, 600000) // legato duration slider: 0-600ms
    move_control_px($sli_holdtime, 67, 121+100)
    //set_control_par_str(get_ui_id($sli_holdtime), $CONTROL_PAR_PICTURE, "knob")
    //set_control_par(get_ui_id($sli_holdtime), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)
    read_persistent_var($sli_holdtime)

    declare ui_label $lbl_holdtime(1, 1) // legato duration control label
    move_control_px($lbl_holdtime, 118, 138+100)
    set_control_par(get_ui_id($lbl_holdtime), $CONTROL_PAR_WIDTH, 120)
    set_text($lbl_holdtime, "legato duration: "&$sli_holdtime/1000)
    hide_part($lbl_holdtime, $HIDE_PART_BG) // hide label background
    set_control_par(get_ui_id($lbl_holdtime), $CONTROL_PAR_FONT_TYPE, 6)



    // {* REVERB CONTROLS *}
    // declare ui_slider pers $sli_reverb(100000, 700000) // reverb amount slider
    // move_control_px($sli_reverb, 506, 86)
    // set_control_par_str(get_ui_id($sli_reverb), $CONTROL_PAR_PICTURE, "knob")
    // set_control_par(get_ui_id($sli_reverb), $CONTROL_PAR_MOUSE_BEHAVIOUR, -2500)

    // declare ui_label $lbl_reverb(1, 1) // reverb amount control label
    // move_control_px($lbl_reverb, 558, 103)
    // set_control_par(get_ui_id($lbl_reverb), $CONTROL_PAR_WIDTH, 60)
    // // set_text($lbl_reverb, $sli_reverb/1000)
    // hide_part($lbl_reverb, $HIDE_PART_BG)
    // set_control_par(get_ui_id($lbl_reverb), $CONTROL_PAR_FONT_TYPE, 6)


    {* OTHER CONTROLS *}
    // declare ui_switch pers $swi_reps_bypass // legato toggle button
    // move_control_px($swi_reps_bypass, 296, 124)
    // set_control_help($swi_reps_bypass, "Toggles round robins.")
    // //set_control_par_str(get_ui_id($swi_reps_bypass), $CONTROL_PAR_PICTURE, "switch")
    // set_control_par_str(get_ui_id($swi_reps_bypass), $CONTROL_PAR_TEXT, "")
    // set_control_par(get_ui_id($swi_reps_bypass), $CONTROL_PAR_WIDTH, 36)
    // set_control_par(get_ui_id($swi_reps_bypass), $CONTROL_PAR_HEIGHT, 312/6)

    // declare ui_label $lbl_articulation(1, 1) // articulation name label
    // set_text($lbl_articulation, "")
    // set_control_par($lbl_articulation, $CONTROL_PAR_WIDTH, 160)
    // set_control_par_str($lbl_articulation, $CONTROL_PAR_PICTURE, "articulation")
    // move_control_px($lbl_articulation, 66, 221)
end on

on ui_control($sli_offset)
    set_text($lbl_offset, "sustain offset: "&$sli_offset/1000)
end on

// on ui_control($sli_int_offset)
//     set_text($lbl_int_offset, "interval offset: "&$sli_int_offset/1000)
// end on

on ui_control($sli_fade)
    set_text($lbl_fade, "fade in: "&$sli_fade/1000)
end on

on ui_control($sli_fade_out)
    set_text($lbl_fade_out, "fade out: "&$sli_fade_out/1000)
end on

on ui_control($sli_holdtime)
    set_text($lbl_holdtime, "legato duration: "&$sli_holdtime/1000)
end on

on note
    disallow_group($ALL_GROUPS)

    if(in_range($EVENT_NOTE, App.LOW_NOTE, App.HIGH_NOTE)) // if note is in playable range,

        if(swi_legato_bypass = TRUE) // legato is bypassed
            select(articulation)
                case 0 // sustain
                    for i := 0 to num_elements(Sets.sustains)-1
                        allow_group(Sets.sustains[i])
                    end for
                //case 1 // staccato
                //    allow_group(Sets.staccatos)
            end select
        else
            // legato is on
            true_legato($EVENT_NOTE, $EVENT_VELOCITY, $sli_fade, $sli_fade_out, $sli_holdtime, $sli_offset)
        end if
    end if
end on

on release
    if($EVENT_NOTE = last_note and swi_legato_bypass = FALSE)
        last_note := -1 // reset last note
    end if
end on


{**********************************************************************
* GUI CONTROL CALLBACKS *
**********************************************************************}
// * POSITIONING KNOBS *
{on ui_control($knb_x)
    set_control_par(get_ui_id($sli_offset), $CONTROL_PAR_POS_X, $knb_x)
end on

on ui_control($knb_y)
    set_control_par(get_ui_id($sli_offset), $CONTROL_PAR_POS_Y, $knb_y)
end on}

{**********************************************************************
* FUNCTIONS *
**********************************************************************}
function true_legato(note_num, note_vel, fadetime, fadeouttime, holdtime, offset)
    declare const WAIT_RES := 200 // resolution of legato hold loop

    declare interval // the interval to play
    declare is_legato // boolean flag

    // Loop iterators
    declare i
    declare pacer

    ignore_event($EVENT_ID)

    if(is_legato = TRUE) // legato hold loop is in progress
        pacer := holdtime // exit hold loop
        wait(WAIT_RES) // give it a moment to exit
    end if

    // Determine played interval
    if (last_note # -1) // check if last note exists
        interval := abs(note_num - last_note)
    end if

    if(last_note # -1 and interval <= 12) // if last note exists and interval is within legato range
        if(last_note > note_num) // this is a down interval
            interval := interval + 64
        end if

        // enable interval groups
        disallow_group($ALL_GROUPS)
        for i := 0 to num_elements(Sets.intervals)-1
            allow_group(Sets.intervals[i])
        end for

        note_off(%note_ids[1]) // end any already-playing intervals
        %note_ids[1] := play_note(last_note, interval, 0, -1) // play the interval note

        // crossfade: sustain to interval
        fade_out(%note_ids[0], fadetime, 1) // fade out sustain note and turn it off
        fade_in(%note_ids[1], fadetime/2) // fade in interval note

        is_legato := TRUE // mark legato flag as hold loop begins
        for pacer := 0 to holdtime/WAIT_RES // hold the interval sample until we want to fade in the new sustain
            if (%KEY_DOWN[note_num] = 0)
                note_off(%note_ids[0]) // turn off sustain
                note_off(%note_ids[1]) // turn off interval
                last_note := -1 // reset last note
                exit
            end if

            wait(WAIT_RES)
        end for
        is_legato := FALSE // reset legato flag because hold loop is complete

        // enable sustain groups
        disallow_group($ALL_GROUPS)
        for i := 0 to num_elements(Sets.sustains)-1
            allow_group(Sets.sustains[i])
        end for

        note_off(%note_ids[0]) // turn off old sustain
        %note_ids[0] := play_note(note_num, note_vel, offset, -1) // play sustain

        // crossfade: interval to sustain
        fade_out(%note_ids[1], fadeouttime, 1) // fade out interval note and turn it off
        fade_in(%note_ids[0], fadeouttime/2) // fade in sustain note


    else // if last note is -1

        // enable sustain groups
        disallow_group($ALL_GROUPS)
        for i := 0 to num_elements(Sets.sustains)-1
            allow_group(Sets.sustains[i])
        end for

        note_off(%note_ids[0]) // end any already-playing sustains
        %note_ids[0] := play_note(note_num, note_vel, 0, -1) // play sustain
    end if

    last_note := note_num // save the number of the last note played
end function