#!/bin/bash
# (C) 2018-2020 Felix Hauri - felix@f-hauri.ch
# Licensed under terms of GPL v3. www.gnu.org
# Color browser using hsv<->rgb functions

SRCDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
if [ -e $SRCDIR/hsvrgb.sh ] ;then . $SRCDIR/hsvrgb.sh
   else echo >&2 "Functions file 'hsvrgb.sh' not found."; exit 1
fi

hueDemos=${1:-10}  satDemos=${2:-6}  valuesDemos=${3:-3}  mixedDemo=${4:-true}

if $mixedDemo ;then
    ansiBunch=(ansiRGBdemo\ ansi1Bdemo)
else
    ansiBunch=(ansiRGBdemo  ansi1Bdemo)
fi
ansiRGBdemo() { 
    printf '\e[0;48;2;%s;%s;%sm %02X%02X%02X \e[0m' "$@" "$@"
}
ansi1Bdemo() { 
    local -i r=$(( $1/42>5?5:$1/42 )) g=$(( $2/42>5?5:$2/42 )) \
          b=$(( $3/42>5?5:$3/42 ))
    printf '\e[48;5;%dm   %03d  \e[0m' $(( 16 + r*36+ $g *6+ $b )){,}
}
for bunchDemo in "${ansiBunch[@]}" ;do
    read -ra bunchDemo <<<"$bunchDemo"
    for ((v=-1;v<255;v+=(255/valuesDemos)));do
        ((v>(255-255/valuesDemos))) && v=255
        ((v>0)) &&for ((s=0; s<=100000; s+=100000/(satDemos-1) ));do
            ((s>(100000-100000/(satDemos-1)))) && s=100000
            ds=0000$s
            printf -v ds %.5f ${ds::-5}.${ds: -5}
            for ansiDemo in "${bunchDemo[@]}";do
                for ((t=0;t<=(360-360/hueDemos); t+=360/hueDemos));do
                    rgb $t $ds $v out
                    $ansiDemo "${out[@]}"
                done
                echo
            done
        done
    done
done

printf -v AFmt '%*s' 80 ''
AFmt=${AFmt// /'\e[48;5;%d;38;5;%dm\U2590'}
AFmt+='\e[0m\n'
printf -v CFmt '%*s' 80 ''
CFmt=${CFmt// /'\e[48;2;%d;%d;%d;38;2;%d;%d;%dm\U2590'}
CFmt+='\e[0m\n'

declare -ia cline=() aline=() rcols
declare -i i ansi
for s in 1 .{90..00..10};do
    for i in {0..159};do
	rgb $((i*224375/100000)) $s 255 rcols
	aline+=("16+${rcols[0]}*5/255*36+5*${rcols[1]}/255*6+5*${rcols[2]}/255")
	cline+=(${rcols[@]})
    done
done
printf "$AFmt" ${aline[@]}
printf "$CFmt" ${cline[@]}

cline=() aline=()
for v in {255..25..25};do
    for i in {0..159};do
	rgb $((i*224375/100000)) 1 $v rcols
	aline+=("16+${rcols[0]}*5/255*36+5*${rcols[1]}/255*6+5*${rcols[2]}/255")
	cline+=(${rcols[@]})
    done
done
printf "$AFmt" ${aline[@]}
printf "$CFmt" ${cline[@]}