#!/usr/bin/env bash

# Test black and white
echo "=== Black and White ==="
printf "Normal text\n"
printf "\e[1mBold text\e[0m\n"
printf "\e[7mReverse text\e[0m\n\n"

# Test 4-bit ANSI (16 colors)
echo "=== 4-bit ANSI Colors (16 colors) ==="
echo "Foreground colors:"
for i in {30..37}; do
    printf "\e[${i}m\\e[${i}m\e[0m "
done
echo -e "\n"

echo "Background colors:"
for i in {40..47}; do
    printf "\e[${i}m\\e[${i}m\e[0m "
done
echo -e "\n"

echo "Bright foreground colors:"
for i in {90..97}; do
    printf "\e[${i}m\\e[${i}m\e[0m "
done
echo -e "\n"

echo "Bright background colors:"
for i in {100..107}; do
    printf "\e[${i}m\\e[${i}m\e[0m "
done
echo -e "\n\n"

# Test 8-bit ANSI (256 colors)
echo "=== 8-bit ANSI Colors (256 colors) ==="
echo "16 System Colors:"
for i in {0..15}; do
    printf "\e[48;5;${i}m  \e[0m"
    if [ $((($i + 1) % 8)) == 0 ]; then
        echo
    fi
done
echo

echo "216 RGB Colors:"
for i in {16..231}; do
    printf "\e[48;5;${i}m  \e[0m"
    if [ $((($i - 15) % 36)) == 0 ]; then
        echo
    fi
done
echo

echo "24 Grayscale Colors:"
for i in {232..255}; do
    printf "\e[48;5;${i}m  \e[0m"
    if [ $((($i - 231) % 12)) == 0 ]; then
        echo
    fi
done
echo -e "\n"

# Test 24-bit true color
echo "=== 24-bit True Color (16.7 million colors) ==="
echo "RGB Color Gradient:"
awk 'BEGIN{
    s="/\\";
    for (colnum = 0; colnum<77; colnum++) {
        r = 255-(colnum*255/76);
        g = (colnum*510/76);
        b = (colnum*255/76);
        if (g>255) g = 510-g;
        printf "\033[48;2;%d;%d;%dm", r,g,b;
        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
        printf "%s\033[0m", substr(s,colnum%2+1,1);
    }
    printf "\n";
}'

echo "RGB Color Bars:"
for r in 0 127 255; do
    for g in 0 127 255; do
        for b in 0 127 255; do
            printf "\e[48;2;${r};${g};${b}m  \e[0m"
        done
        printf " "
    done
    echo
done
echo

# Print terminal information
echo "=== Terminal Information ==="
echo "TERM: $TERM"
echo "COLORTERM: $COLORTERM"
echo "Reported colors (tput colors): $(tput colors)"