#!/bin/sh

if [ "$1" = "-bg" ]; then
    DEFAULT_BG="$(printf '\033[48;5;%im' "$2")"
fi

echo
echo "Standard colors:"
for i in 0:BLACK 1:RED 2:GREEN 3:YELLOW 4:BLUE 5:MAGENTA 6:CYAN 7:WHITE; do
    NAME="${i#*:}"
    CODE="${i%:*}"
    F_CODE=$(( CODE + 30 ))
    B_CODE=$(( CODE + 40 ))
    FB_CODE=$(( CODE + 90 ))
    BB_CODE=$(( CODE + 100 ))
    printf '\e[0;%im %-7s \e[0m \e[0;%im %-7s \e[0m \e[0;%im %-7s \e[0m \e[0;%im %-7s \e[0m\n' "$F_CODE" "$NAME" "$FB_CODE" "$NAME" "$B_CODE" "$NAME" "$BB_CODE" "$NAME"
done

echo
echo "Backgrounds:"
for i in 0:BLACK 1:RED 2:GREEN 3:YELLOW 4:BLUE 5:MAGENTA 6:CYAN 7:WHITE; do
    NAME="${i#*:}"
    CODE="${i%:*}"
    F_CODE=$(( CODE + 30 ))
    FB_CODE=$(( CODE + 90 ))
    FORMAT=""; set --
    for BG in 0 1 2 3 4 5 6 7; do
        BG_CODE=$(( BG + 40 ))
        FORMAT="${FORMAT}\\e[0;%i;%im %-7s \\e[0m \\e[0;%i;%im %-7s \\e[0m "
        set -- "$@" "$BG_CODE" "$F_CODE" "$NAME" "$BG_CODE" "$FB_CODE" "$NAME"
    done
    printf "$FORMAT\n" "$@"
done
echo
for i in 0:BLACK 1:RED 2:GREEN 3:YELLOW 4:BLUE 5:MAGENTA 6:CYAN 7:WHITE; do
    NAME="${i#*:}"
    CODE="${i%:*}"
    F_CODE=$(( CODE + 30 ))
    FB_CODE=$(( CODE + 90 ))
    FORMAT=""; set --
    for BG in 0 1 2 3 4 5 6 7; do
        BGB_CODE=$(( BG + 100 ))
        FORMAT="${FORMAT}\\e[0;%i;%im %-7s \\e[0m \\e[0;%i;%im %-7s \\e[0m "
        set -- "$@" "$BGB_CODE" "$F_CODE" "$NAME" "$BGB_CODE" "$FB_CODE" "$NAME"
    done
    printf "$FORMAT\n" "$@"
done

echo
echo "256 colors:"
echo
echo "Standard colors:"
FORMAT=""; set --
for i in $(seq 0 15); do
    FORMAT="${FORMAT}${DEFAULT_BG}\\e[38;5;%im %-3s \\e[0m"
    set -- "$@" $i $i
done
printf "$FORMAT\n" "$@"

echo
echo "3-byte colors:"
if [ 1 -eq 1 ]; then
    for row in 0 1; do
        for j in $(seq 0 5); do
            FORMAT=""; set --
            for cube in 0 1 2; do
                for i in $(seq 0 5); do
                    CODE=$(( 16 + row * 108 + cube * 36 + i + j * 6 ))
                    FORMAT="${FORMAT}${DEFAULT_BG}\\e[38;5;%im %03i\\e[0m"
                    set -- "$@" "$CODE" "$CODE"
                done
                FORMAT="${FORMAT}${DEFAULT_BG} \\e[0m"
            done
            printf "$FORMAT\n" "$@"
        done
        echo
    done
else
    for row in 0; do
        for j in $(seq 0 5); do
            FORMAT=""; set --
            for cube in 0 1 2 3 4 5; do
                for i in $(seq 0 5); do
                    CODE=$(( 16 + row * 108 + cube * 36 + i + j * 6 ))
                    FORMAT="${FORMAT}${DEFAULT_BG}\\e[38;5;%im %03i\\e[0m"
                    set -- "$@" "$CODE" "$CODE"
                done
                FORMAT="${FORMAT}${DEFAULT_BG} \\e[0m"
            done
            printf "$FORMAT\n" "$@"
        done
        echo
    done
fi

echo "Grayscale colors:"
FORMAT=""; set --
for i in $(seq 232 255); do
    FORMAT="${FORMAT}${DEFAULT_BG}\\e[38;5;%im %03i\\e[0m"
    set -- "$@" "$i" "$i"
done
printf "$FORMAT\n" "$@"

INSERT=$(cat <<EOF
EOF
)

rgb() {
    local R="$1" G="$2" B="$3" K="$4" C
    if [ -n "$K" ]; then
        [ "$K" -ge 0 ] && K=$(( ( 5 * K + 50 ) / 100 )) || K=$(( ( 5 * K - 50 ) / 100 ))
        R=$(( R + K ))
        G=$(( G + K ))
        B=$(( B + K ))
    fi
    [ $R -le 5 ] || R=5
    [ $G -le 5 ] || G=5
    [ $B -le 5 ] || B=5
    [ $R -ge 0 ] || R=0
    [ $G -ge 0 ] || G=0
    [ $B -ge 0 ] || B=0
    C=$(( 16 + R*36 + G*6 + B ))
    echo "$INSERT" | while read -r RGB _M; do
        [ "$_M" = "$R$G$B" ] || continue
        _R="${RGB%??}"
        _B="${RGB#??}"
        RGB="${RGB%?}"
        _G="${RGB#?}"
        rgb "$_R" "$_G" "$_B"
    done
    printf "$DEFAULT_BG"
    #printf '\033[38;5;%im %i%i%i\033[0m' "$C" "$R" "$G" "$B"
    printf '\033[38;5;%im %03i\033[0m' "$C" "$C"
    echo "$C" >>rgbcolors
}

rgb_missed() {
    local C=16 S=0 R G B W
    printf "Missed:"
    while [ $C -le 231 ]; do
        if ! grep --silent "^$C\$" rgbcolors; then
            S=$(( S + 1 ))
            W=$(( C - 16 ))
            R=$(( W / 36 ))
            G=$(( ( W - R*36 ) / 6 ))
            B=$(( W - R*36 - G*6 ))
            printf " %s(\033[38;5;%im%s%s%s\033[0m)" "$C" "$C" "$R" "$G" "$B"
        fi
        C=$(( C + 1 ))
    done
    echo
    echo "Total missed: $S"
}

vbar() {
    printf "$DEFAULT_BG"
    printf '\033[38;5;244m ║\033[0m'
}
hbar() {
    printf "$DEFAULT_BG"
    printf '\033[38;5;244m'
    printf '═%.0s' $(seq 1 $1)
    printf '\033[0m\n'
}

echo
echo "Rainbow:"
#for bright in 1 2 3 4 5; do
#    rgb $bright 0 0
#done
#echo
#for bright in 1 2 3 4 5; do
#    rgb 0 $bright 0
#done
#echo
#for bright in 1 2 3 4 5; do
#    rgb 0 0 $bright
#done
#echo
#for r in 5 4 3 2 1; do
#    for b in 0 1 2 3 4 5; do
#        rgb $r $(( 5 - r )) $b
#    done
#    echo
#done
#for g in 5 4 3 2 1; do
#    for r in 0 1 2 3 4 5; do
#        rgb $r $g $(( 5 - g ))
#    done
#    echo
#done
#for b in 5 4 3 2 1; do
#    for g in 0 1 2 3 4 5; do
#        rgb $(( 5 - b )) $g $b
#    done
#    echo
#done

#rm -f rgbcolors
#
#for g in 0 1 2 3 4 5; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( 5 * $d / 10 )) $(( ($g + 1) * $d / 10 - 1 )) $(( (0 + 1) * $d / 10 - 1 ))
#    done
#    echo
#done
#for r in 4 3 2 1 0; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( ($r + 1) * $d / 10 - 1 )) $(( 5 * $d / 10 )) $(( (0 + 1) * $d / 10 - 1 ))
#    done
#    echo
#done
#for b in 1 2 3 4 5; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( (0 + 1) * $d / 10 - 1 )) $(( 5 * $d / 10 )) $(( ($b + 1) * $d / 10 - 1 ))
#    done
#    echo
#done
#for g in 4 3 2 1 0; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( (0 + 1) * $d / 10 - 1 )) $(( ($g + 1) * $d / 10 - 1 )) $(( 5 * $d / 10 ))
#    done
#    echo
#done
#for r in 1 2 3 4 5; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( ($r + 1) * $d / 10 - 1 )) $(( (0 + 1) * $d / 10 - 1 )) $(( 5 * $d / 10 ))
#    done
#    echo
#done
#for b in 4 3 2 1 0; do
#    for d in 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 40 50 60; do
#        rgb $(( 5 * $d / 10 )) $(( (0 + 1) * $d / 10 - 1 )) $(( ($b + 1) * $d / 10 - 1 ))
#    done
#    echo
#done
#rgb_missed
#echo

rm -f rgbcolors

#for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
#    [ $d -ne 0 ] || vbar
#    printf '%4s' $d
#    [ $d -ne 0 ] || vbar
#done
#echo

for g in 0 1 2 3 4 5; do
    #rgb 1 $g $g
    [ $g -ne 5 ] || hbar 52
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
#        if [ $(( g + d * 5 / 100 )) -ge 6 ] && [ $d -gt 0 ]; then
#            rgb $(( 5 - 1 )) $(( g - 1 )) $(( 0 + d * 5 / 100 ))
#            printf " $r$g$b"
#            printf "     "
#        else
            rgb 5 $g 0 $d
#        fi
        [ $d -ne 0 ] || vbar
    done
    echo
    [ $g -ne 5 ] || hbar 52
done
for r in 4 3 2 1 0; do
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
        rgb $r 5 0 $d
        [ $d -ne 0 ] || vbar
    done
    echo
done
for b in 1 2 3 4 5; do
    [ $b -ne 5 ] || hbar 52
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
        rgb 0 5 $b $d
        [ $d -ne 0 ] || vbar
    done
    echo
    [ $b -ne 5 ] || hbar 52
done
for g in 4 3 2 1 0; do
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
        rgb 0 $g 5 $d
        [ $d -ne 0 ] || vbar
    done
    echo
done
for r in 1 2 3 4 5; do
    [ $r -ne 5 ] || hbar 52
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
        rgb $r 0 5 $d
        [ $d -ne 0 ] || vbar
    done
    echo
    [ $r -ne 5 ] || hbar 52
done
for b in 4 3 2 1 0; do
    for d in -100 -80 -60 -40 -20 0 20 40 60 80 100; do
        [ $d -ne 0 ] || vbar
        rgb 5 0 $b $d
        [ $d -ne 0 ] || vbar
    done
    echo
done

#-------------------------------------
echo
for r in 1 2 3 4; do
    for g in 1 2 3 4; do
        printf "$DEFAULT_BG"
        printf '    '
        for b in 1 2 3 4; do
            rgb $r $g $b
            #printf '=%i' $(( r + g + b ))
        done
        echo
    done
    echo
done

#rgb_missed

rm -f rgbcolors