#!/bin/sh
PATH_TO_LIBRARY="${HOME}/Projects";
PATH_TO_DEVELOPER="${HOME}/Developer";

check_for_folder_or_return_error() {
    path2check="${1}";
    if [ ! -d "${path2check}" ]; then
        echo "Path ${path2check} is not a folder. Skipping.";
        return 1;
    fi
}

check_for_development_folder_or_return_error() {
    path2check="${1}";
    if [ "${path2check##*/}" != "Development" ]; then
        echo "Path ${path2check} is not a Development folder. Skipping.";
        return 2;
    fi
}

remove_library_path_prefix() {
    given_path="${1}";
    path_with_library_prefix_removed="${given_path#${PATH_TO_LIBRARY}/}";
    path_with_root_dot="${path_with_library_prefix_removed:-.}";
    echo "${path_with_root_dot}";
}

remove_trailing_slash_in_path() {
    given_path="${1}";
    path_without_tailing_slash="${given_path%/}";
    path_with_root_slash="${path_without_last_slash:-/}";
    echo "${path_with_root_slash}";
}

remove_trailing_development_folder() {
    given_path="${1}";
    path_with_development_remove="${given_path%/Development}";
    echo "${path_with_development_remove}";
}

remove_last_path_element() {
    given_path="${1}";
    path_without_last_element="${given_path%/*}";
    path_with_root_slash="${path_without_last_element:-/}";
    echo "${path_with_root_slash}";
}

remove_file_from_path() {
    given_path="${1}";
    [ -f "${given_path}" ] && given_path=`remove_last_path_element "${given_path}"`;
    echo "${given_path}";
}

get_last_folder_in_path() {
    given_path=`remove_file_from_path ${1}`;
    tail_of_path="${given_path##*/}";
    tail_with_root_slash="${tail_of_path:-/}";
    echo "${tail_with_root_slash}";
}

reduce_path_to_owner_and_client() {
    given_path="${1}";
    relative_path=`remove_library_path_prefix "${library_path}"`;
    owner_and_client_folder=`remove_trailing_development_folder "${relative_path}"`;
    echo "${owner_and_client_folder}";
}

create_owner_folder_in_developer() {
    owner="${1}";
    development_path="${PATH_TO_DEVELOPER}/${owner}";

    if [ ! -d "${development_path}" ]; then
        echo "Creating: ${development_path}";
        mkdir -p "${development_path}";
    fi
}

link_folder_to_developer_as_client() {
    folder="${1}";
    owner="${2}";
    client="${3}";

    development_path="${PATH_TO_DEVELOPER}/${owner}";

    if [ ! -L "${development_path}/${client}" ]; then
        echo "  >Linked Development for client ${client} to owner ${development_path%/*}";
        ln -s "${folder}" "${development_path}/${client}";
    fi 
}

link_development_folders() {
    library_path=`remove_trailing_slash_in_path "${1}"`;
    check_for_folder_or_return_error "${library_path}" || exit $?;
    check_for_development_folder_or_return_error "${library_path}" || exit $?;

    owner_and_client_folder=`reduce_path_to_owner_and_client "${library_path}"`;
    client=`get_last_folder_in_path "${owner_and_client_folder}"`;
    owner="${owner_and_client_folder%/${client}}";

    create_owner_folder_in_developer "${owner}";
    link_folder_to_developer_as_client "${library_path}" "${owner}" "${client}";
}

find_and_link_development_folders() {
    find "${PATH_TO_LIBRARY}" -type d -name "Development" -maxdepth 4 -print0 2> /dev/null |
        while IFS= read -r -d '' line; do
            link_development_folders "${line}";
        done
}

find_and_link_executables() {
    find "${PATH_TO_LIBRARY}" -type d -name "Development" -maxdepth 4 -print0 2> /dev/null |
        while IFS= read -r -d '' line; do
            link_development_folders "${line}";
        done
}

main() {
    find_and_link_development_folders;
    find_and_link_executables;
}