#/bin/bash
clear
echo '|--------------|'
echo '|Boot generator|'
echo '|--------------|'
iso_date=$(date "+%Y.%m.")

read -p "Do you want to use the archlinux-${iso_date}01-x86_64.iso?(YES/NO) :" archlinux
if [ "$archlinux" = "NO" ]; then
    echo -e "\e[31mAttention\e[0m"
    read -p "Enter the date like '2026.04.': " iso_date
fi
echo ''
echo '-----------------------------------------------------------------------------------------------------------'
blkid
echo '-----------------------------------------------------------------------------------------------------------'
echo ''
read -p "Which partition is the ISO located? 1 or 2(line) :" p_iso
echo ''
uuid=$(blkid | sed -n "${p_iso}p"| grep -Eo '\<UUID=.{9}-.{4}-.{4}-.{4}-.{12}' | grep -Eo '.{8}-.{4}-.{4}-.{4}-.{12}')
echo -e "\e[32mUUID=${uuid}\e[0m"
echo -e "\e[32mRelease=archlinux-${iso_date}01-x86_64.iso\e[0m"
echo ''

cat << EOF > grub_arch
menuentry "Arch ISO" {

    set isofile="/archlinux-${iso_date}01-x86_64.iso"

    insmod part_gpt
    insmod ext2
    insmod loopback
    insmod iso9660

    search --no-floppy --fs-uuid --set=root $uuid

    loopback loop \$isofile

    linux (loop)/arch/boot/x86_64/vmlinuz-linux \\
        img_dev=/dev/disk/by-uuid/$uuid \\
        img_loop=\$isofile

    initrd (loop)/arch/boot/x86_64/initramfs-linux.img
}
EOF

read -p "Do you want to copy it to /boot/grub/grub.cfg and backup the old grub.cof?(YES/NO) :" grub_file
if [ "$grub_file" = "YES" ]; then
    cp grub_arch /boot/grub/
    mv /boot/grub/grub.cfg /boot/grub/grub.cfg.back
    mv /boot/grub/grub_arch /boot/grub/grub.cfg
    sed -n '1p' /boot/grub/grub.cfg
fi