#!/bin/bash

######################################################################
###   bash <(curl -fsSL https://raw.lhy.life/clang.sh) --version=18 
######################################################################

if dpkg -l 'g++*' 2>/dev/null | grep "^ii"; then
    apt purge 'clang*' 'lldb*' 'lld*' 'clangd*' 'g++*' -y
    apt autopurge -y
fi


## GetArgValue <key> <defValue>
## ./script --key=value
g_args=("$@")
function GetArgValue()
{
    local key="$1"
    local defvalue="$2"

    for arg in "${g_args[@]}"
    do
        if [[ "$arg" == "--$key="* ]]
        then
            echo "${arg#*=}"
            return
        fi
    done

    echo "$defvalue"
}

VERSION=$(GetArgValue "version" "")
if [ -n "$VERSION" ]; then
    VERSION="-$VERSION"
fi

apt update && apt install lsb-release wget gnupg g++-multilib git make -y
apt install clang$VERSION lldb$VERSION lld$VERSION clangd$VERSION -y

sed -i "/^export PATH=\/usr\/lib\/llvm/d" /etc/profile
sed -i "/^export CC=/d" /etc/profile
sed -i "/^export CXX=/d" /etc/profile

if [ -n "$VERSION" ]; then
    echo "export PATH=/usr/lib/llvm$VERSION/bin:\$PATH" >> /etc/profile
fi
echo 'export CC=clang' >> /etc/profile
echo 'export CXX=clang++' >> /etc/profile