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DEFAULT_APP_PATH="/Applications/DaVinci Resolve/DaVinci Resolve.app"
APP_PATH="${1:-$DEFAULT_APP_PATH}"
APP_FILE="$APP_PATH/Contents/MacOS/Resolve"
HEX_VALUES_APP=(
    "0000405B01" "0000005B01"      #Intel
    "A9FF84C00F85" "A9FFB0010F85"  #Intel
    "CCE8B4C1FFFF" "CCB800000000"  #Intel
    "CCE8B4C1FFFF" "CCB800000000"  #Intel
    "D95FEB97" "20008052"          #Arm
    "D85FEB97" "20008052"          #Arm
    "4EF0FF97E0" "000080D2E0"      #Arm
)
check_utilities() {
    local utilities=("perl" "codesign" "xattr")
    for util in "${utilities[@]}"; do
        command -v "$util" >/dev/null 2>&1 || {
            echo >&2 "Error: $util is required but not installed. try running 'xcode-select --install'"
            exit 1
        }
    done
}
hex() {
    echo "$1" | perl -0777pe 's|([0-9a-zA-Z]{2}+(?![^\(]*\)))|\\x${1}|gs'
}
hex_patch() {
    local dom sub
    dom=$(hex "$2")
    sub=$(hex "$3")
    sudo perl -0777pi -e 'BEGIN{$/=\1e8} s|'"$dom"'|'"$sub"'|gs' "$1"
}
prep() {
    sudo xattr -r -d com.apple.quarantine "$1"
    sudo codesign --force --deep --sign - "$1"
}
patch_app() {
    for ((i = 0; i < ${#HEX_VALUES_APP[@]}; i += 2)); do
        hex_patch "$APP_FILE" "${HEX_VALUES_APP[i]}" "${HEX_VALUES_APP[i + 1]}"
    done
}
create_license() {
    license_folder="/Library/Application Support/Blackmagic Design/DaVinci Resolve/.license"
    license_file="blackmagic.lic"
    license_content=$(
        cat <<-EOF
LICENSE blackmagic davinciresolvestudio $(printf "%06d" $((RANDOM % 1000000))) permanent uncounted
hostid=ANY issuer=CGP customer=CGP issued=$(LC_TIME=en_US.UTF-8 date +"%d-%b-%Y")
akey=$(printf "%04d-%04d-%04d-%04d-%04d" $((RANDOM % 10000)) $((RANDOM % 10000)) $((RANDOM % 10000)) $((RANDOM % 10000)) $((RANDOM % 10000))) _ck=00 sig="00"
EOF
    )
    [ -f "$license_folder/$license_file" ] && sudo mv "$license_folder/$license_file" ~/Desktop/
    [ ! -d "$license_folder" ] && sudo mkdir -p "$license_folder"
    sudo tee "$license_folder/$license_file" >/dev/null <<<"$license_content"
}

check_utilities
patch_app
prep "$APP_PATH"
create_license