#!/usr/bin/env bash
# HEADER
#=======================================================================
#
#  trombinoscope -- make a simple trombinoscope from names and photos.
#
#  SYNOPSIS
#    trombinoscope -n <names.csv> -p <photos> -o <outfile.tex>
#
#  DESCRIPTION
#    Shell script to make a trombinoscope from a given list of names
#    and a list of photos with names in the same ordre. It first
#    establish a bijection between names and photos and then write a
#    LaTeX file.
#
#  POSITIONAL ARGUMENT
#    -n|names <list.csv>        a csv file of two columns (first;last)
#    -p|photos <directory>      directory name for photos
#
#  OPTIONS
#    -h|--help                  display this help and exit
#    -c|class                   class name
#    -y|year                    school year
#    -o|output <outfile.tex>    LaTeX outfile name
#    -i|img                     directory of photos with names
#
#  EXAMPLES
#    $ trombinoscope -n PCSI.csv -p photos_init -c PCSI -y 2023-2024
#    $ trombinoscope -n PCSI.csv -p photos_init -o trombinoscope.tex
#
#  DEPENDENCIES
#    - imagemagick
#    - GNU coreutils
#
#  Copyright (C) 2023 Nicolas Mesnier <nmesnier@free.fr>
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 3 or
#  above as published by the Free Software Foundation.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#=======================================================================
# END_OF_HEADER
#-----------------------------------------------------------------------
Help(){
    # Read header to display help and version
    BOH=$(head -200 ${0} | grep -n "^# HEADER" | cut -f1 -d:)
    EOH=$(head -200 ${0} | grep -n "^# END_OF_HEADER" | cut -f1 -d:)
    head -$(($EOH-1)) ${0} | tail -$(($EOH-$BOH-1)) \
        | grep -e "^#$" -e "^# " | sed -e "s/^#=*//g"
}
#-----------------------------------------------------------------------
# *** get options ***
#-----------------------------------------------------------------------
NAMES=""
PHOTOS=""
CLASS="<CLASSE>"
YEAR="<ANNÉE>"
TEXFILE=""
IMG="img"

while [[ ${1} ]]; do
    case "${1}" in
        -h|--help)
            Help
            exit 0 ;;
        # *** run function
        -n|names)
            if [ -f ${2} ];then
                NAMES=${2}
            else
                echo "File \"${2}\" does not exists." >&2
                exit 1
            fi
            shift
            ;;
        -p|photos)
            if [ -d ${2} ];then
                PHOTOS=${2}
            else
                echo "Directory \"${2}\" does not exists." >&2
                exit 1
            fi
            shift
            ;;
        -o|output)
            if [ -f ${2} ]; then
                read -p " File \"${2}\" allready exists. Replace? y/[n]  " rep
                case ${rep} in
                    [Yy]* )
                        TEXFILE=$(basename ${2} .tex)".tex"
                        ;;
                    * ) exit 1;;
                esac
            else
                TEXFILE=$(basename ${2} .tex)".tex"
            fi
            shift
            ;;
        -c|class)
            CLASS=${2}
            shift
            ;;
        -y|year)
            YEAR=${2}
            shift
            ;;
        -i|img)
            IMG=${2}
            shift
            ;;
    esac
    if ! shift; then
        echo "Missing parameter argument." >&2
        exit 1
    fi
done

if [ -z ${NAMES} ];then
    echo "You must give a CSV file for names." >&2
    exit 1
fi
if [ -z ${PHOTOS} ];then
    echo "You must give a directory for photos." >&2
    exit 1
fi

#-----------------------------------------------------------------------
# *** check if their are the same numbers of names and photos
#-----------------------------------------------------------------------

item(){
    echo "$(wc -l ${1} | cut -d ' ' -f1)"
}

NB_NAMES="$(item ${NAMES})"
NB_PHOTOS="$(item <(ls -1 ${PHOTOS}))"

difference(){
    DIFF=$(($1-$2))
    if [ ${DIFF} == 1 ];then
        echo "${DIFF} ${3} is missing." >&2
    else
        echo "${DIFF} ${3}s are missing." >&2
    fi
}

if [ ${NB_NAMES} != ${NB_PHOTOS} ];then
    echo "Their must be the same number of names and photos." >&2
    if [ "${NB_NAMES}" -gt "${NB_PHOTOS}" ];then
        difference ${NB_NAMES} ${NB_PHOTOS} "photo"
    else
        difference ${NB_PHOTOS} ${NB_NAMES} "name"
    fi
    exit 1
fi
#-----------------------------------------------------------------------
# *** Set the output file name if none is given
#     but the CLASS and YEAR are.
#-----------------------------------------------------------------------

if [ -z ${TEXFILE} ];then
    if [ -z ${CLASS} ] && [ -z ${YEAR} ];then
        echo "No output file name given." >&2
        exit 1
    else
        TEXFILE="trombinoscope_"${CLASS}"_"${YEAR}".tex"
        echo " Output file fixed to '${TEXFILE}'."
    fi
fi

#-----------------------------------------------------------------------
# *** check before writing in ${IMG}
#-----------------------------------------------------------------------

if [ -d ${IMG} ];then
    read -p "Directory \"${IMG}\" allready exists. Purge? y/[n]  " rep
    case ${rep} in
        [Yy]* )
            find ${IMG} -type f -delete
            ;;
        * )
            exit 1
            ;;
    esac
else
    mkdir -p ${IMG}
fi

#-----------------------------------------------------------------------
# *** write LaTeX file
#-----------------------------------------------------------------------

# header
cat > ${TEXFILE}<<EOF
\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx,tikz,pgf,pgfcore,pgfplots,calc}
\usetikzlibrary{calc,shapes,topaths,positioning}
\usepackage[headheight=0pt,margin=5mm,top=15mm,nofoot,bottom=10mm]{geometry}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
% \renewcommand{\sfdefault}{}
\renewcommand*\familydefault{\sfdefault}
\usepackage[default,oldstyle,scale=0.95]{opensans}
\graphicspath{{${IMG}/}}
\begin{document}
\parindent=0pt
\thispagestyle{empty}
\begin{center}
\begin{tikzpicture}[remember picture,overlay]
% *** titre
\node[right] at([xshift=5mm,yshift=-15mm]current page.north west)
{\usefont{T1}{opensans-LF}{b}{n}\fontsize{40}{45}\selectfont ${CLASS}};
\node[left] at([xshift=-5mm,yshift=-15mm]current page.north east)
{\usefont{T1}{opensans-LF}{l}{n}
\fontsize{35}{45}\selectfont ${YEAR}};
\end{tikzpicture}
\end{center}

\vspace*{5mm}

EOF

# for each student
while read line;do
    NOM=$(echo $line | cut -d";" -f1)
    PRENOM=$(echo $line | cut -d";" -f2)
    PHOTO=$(echo $line | cut -d";" -f3)
    NEW_PHOTO=$(echo ${NOM} | tr " " "-")_${PRENOM}".JPG"
    # on réduit et on renomme la photo
    convert ${PHOTOS}/${PHOTO} -resize 400x ${IMG}/${NEW_PHOTO}
	# on écrit le fichier teX
	echo "\parbox[t][42mm][t]{24mm}{\centering" >> ${TEXFILE}
	echo "\includegraphics[angle=90,width=20mm]{"${NEW_PHOTO}"}" >> ${TEXFILE}
	echo "\newline\vskip-1em{\small ${NOM}\\\\[-2pt] ${PRENOM}}}" >> ${TEXFILE}
done < <(paste -d";" ${NAMES} <(ls -1 ${PHOTOS}/))

# footer
cat >> ${TEXFILE}<<EOF

\end{document}
EOF
#====================================================================eof
# vim: set tw=72 ts=4 sw=4 nu: