#!/bin/bash
###############################################################################
# Author: Nils Gersnter                                                       #
# Date:   2023-04-14                                                          #
#                                                                             #
# DESCRIPTION                                                                 #
#                                                                             #
# This script creates an interface to select a project folder.                #
# It sorts the folders in the order, last selected.                           #
#                                                                             #
# SETUP                                                                       #
#                                                                             #
# Put the script in your ${HOME}/bin folder and add the following alias to    #
# your .bashrc (with the allias of your choice)                               #
# alias fp='cd "$(findProject.sh)"'                                           #
#                                                                             #
# DEPENDENCIES                                                                #
#                                                                             #
# This script depends on fzf and sponge being installed on the system.        #
# On debian like systems, sponge can be obtained by installing the moreutils  #
# package.                                                                    #
# fzf can be installed in the ways described here:                            #
# https://github.com/junegunn/fzf#installation                                #
###############################################################################

# The number of selections that is to be kept
LINES_TO_SAVE=200
SELECTED_FOLDERS_LOG=${HOME}/.local/share/findProject_selection.log

# Root folder per customer that contains project folders
CUSTOMER_ROOT_FOLDERS="${HOME}/Documents/Code/BOLIDEN
${HOME}/Documents/Code/GERSTNER
${HOME}/Documents/Code/REPLYTO
${HOME}/Documents/Code/RISE
${HOME}/Documents/Code/VOLVOCARS
${HOME}/Documents/Code/POLIS"

_get_root() {
    if [ -f "${SELECTED_FOLDERS_LOG}" ] && \
        [ $( wc -l "${SELECTED_FOLDERS_LOG}" | grep -oe "^[0-9]\+") -gt 0 ]; then
        tac "$SELECTED_FOLDERS_LOG" | grep -oe "^\S\+"
    fi
    echo -e "${CUSTOMER_ROOT_FOLDERS}"
}

_get_subfolder() {
    if [ -f "${SELECTED_FOLDERS_LOG}" ] && \
        [ $( wc -l "${SELECTED_FOLDERS_LOG}" | grep -oe "^[0-9]\+") -gt 0 ]; then
        tac "$SELECTED_FOLDERS_LOG" | grep -e "^${root_dir} \S\+" | grep -oe "\S\+$"
    fi
    find "$root_dir" -mindepth 1 -maxdepth 1 -type d -printf "%Ts\t%f\n" | sort -rn| cut -f 2
}

_select_uniq() {
    local root="$1"

    cat < /dev/stdin | awk '!x[$0]++' - | fzf --preview "tree -L 1 ${root}{}"
}

root_dir="$(_get_root | _select_uniq)"
base_name="$(_get_subfolder | _select_uniq "${root_dir}/")"

echo "${root_dir}/${base_name}"
echo "${root_dir} ${base_name}" >> "$SELECTED_FOLDERS_LOG"
tail -n $LINES_TO_SAVE  "$SELECTED_FOLDERS_LOG"| sponge "$SELECTED_FOLDERS_LOG"