#!/bin/bash

set -euo pipefail


function symlink() {
    local target="$1"
    local link="$2"

    local arrow="$link -> $target"
    echo "Creating symlink ($arrow) ..."

    local current_target
    current_target=$(readlink "$link" || true)

    # link is already correct
    if [ -L "$link" ] && [ "$current_target" == "$target" ]; then
        echo "Symlink ($arrow) already exists"
        return 0
    fi

    # link exists but is not a symlink
    if [ -e "$link" ] && [ ! -L "$link" ]; then
        echo "Error: $link exists but is not a symlink"
        exit 1
    fi

    # link points to wrong target
    if [ -L "$link" ]; then
        echo "Symlink $link points to the wrong target: $current_target"
        rm "$link"
    fi

    ln -s "$target" "$link"
    echo "Symlink ($arrow) created"
}


if [ $# -ne 2 ]; then
    echo "Usage: $0 <target> <link>"
    exit 1
fi

target="$1"
link="$2"

symlink "$target" "$link"