#!/bin/bash
#
# Copyright (C) 2020 Christian Pierre Momon <christian.momon@devinsy.fr>
# Copyright (C) 2018, 2019 Didier Clermonté <dclermonte@april.org>
# Copyright (C) 2018, 2019 Christian Pierre Momon <christian.momon@devinsy.fr>
#
# This file is part of paste.chapril.org.
#
# This script is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
# access_log /var/log/nginx/mobilizon.chapril.org/mobilizon.chapril.org-access.log
# error_log /var/log/nginx/mobilizon.chapril.org/mobilizon.chapril.org-error.log

# ============================================

LOG_PREFIX="/var/log/nginx/mobilizon.chapril.org/mobilizon.chapril.org"
SERVICE_NAME="mobilizon.chapril.org"

source "/etc/mobilizon.chapril.org/mobilizonchaprilorg.conf"

IPV4_PATTERN="[0-9]{1,3}(\.[0-9]{1,3}){3}"
IPV6_PATTERN="[0-9a-f]{0,4}(:[0-9a-f]{0,4}){2,7}"
#
help()
{
    echo "Usage:"
    echo "    $(basename "$0") -h                display help"
    echo "    $(basename "$0")                   analyse current month"
    echo "    $(basename "$0") -p                analyse preceding month"
    echo "    $(basename "$0") month_number year analyse this month"
}

#
generateHTTPReport()
{
    local monthEnglish="$1"
    local year="$2"
    local yearMonth="$3"

    echo "=§= Rapport d'activité HTTP"
    echo

    local httpRequestCount=$(zgrep "$monthEnglish" $LOG_PREFIX-access.log*|grep $year|wc -l)
    echo "Nombre total de requêtes http                 = $httpRequestCount"

    local trueHttpRequestCount=$(zgrep "$monthEnglish" $LOG_PREFIX-access.log*|grep $year|grep -vi bot|grep -v check_http|wc -l)
    echo "Nombre de vraies requêtes http                = $trueHttpRequestCount"

    local botRequestCount=$(zgrep "$monthEnglish" $LOG_PREFIX-access.log*|grep "$year"|grep -i bot|grep -c -v check_http)
    echo "Nombre de requêtes bot                        = $botRequestCount"

    local errorRequestCount=$(zgrep "$monthEnglish" $LOG_PREFIX-error.log*|grep -c "$year")
    echo "Nombre de requêtes http en erreur             = $errorRequestCount"

    local ipv4VisitorCount=$(zgrep -h "$monthEnglish" $LOG_PREFIX-access.log*|grep "$year"|grep -vi bot|grep -v check_http|egrep "^$IPV4_PATTERN "|cut -d' ' -f1|sort|uniq|wc -l )
    echo "Nombre d'ipv4 ayant visité le service         = $ipv4VisitorCount"

    local ipv6VisitorCount=$(zgrep -h "$monthEnglish" $LOG_PREFIX-access.log*|grep "$year"|grep -vi bot|grep -v check_http|egrep "^$IPV6_PATTERN "|cut -d' ' -f1|sort|uniq|wc -l )
    echo "Nombre d'ipv6 ayant visité le service         = $ipv6VisitorCount"

    echo "Nombre total d'ip ayant visité le service     = $((ipv4VisitorCount+ipv6VisitorCount))"

    echo
}

#
generateSpecificReport()
{
    local monthEnglish="$1"
    local year="$2"
    local yearMonth="$3"

    echo "=§= Rapport d'activité spécifique"
    echo

    ipv4UserCount=$(zgrep -h "$monthEnglish" $LOG_PREFIX-access.log*|grep "$year"|grep -vi bot|grep -v check_http|egrep "^$IPV4_PATTERN " | cut -d' ' -f 1|sort|uniq|wc -l )
    echo "Nombre d'ipv4 utilisatrices du service        = $ipv4UserCount"

    ipv6UserCount=$(zgrep -h "$monthEnglish" $LOG_PREFIX-access.log*|grep "$year"|grep -vi bot|gre\p -v check_http|egrep "^$IPV6_PATTERN " | cut -d' ' -f 1|sort|uniq|wc -l )
    echo "Nombre d'ipv6 utilisatrices du service        = $ipv6UserCount"

    echo "Nombre total d'ip utilisatrices du service    = $((ipv4UserCount+ipv6UserCount))"
    echo

    echo
}

#
generateReport()
{
    echo "Rapport d'activité du service $SERVICE_NAME de $monthEnglish $year"
    echo
    echo "================================================================="
    echo
    generateHTTPReport "$1" "$2" "$3"
    generateSpecificReport "$1" "$2" "$3"
}


# ============================================
echo
if [ "$#" = 1 ] && [ "$1" = "-h" ]; then
    help
elif [ "$#" = 1 ] && [ "$1" = "-p" ]; then
    if [ "$(date +%m)" -gt 1 ]; then
	precedingMonth="$((10#$(date +%m)-1))"
	year="$(date +%Y)"
	if [ $precedingMonth -lt 10 ]; then
	    yearMonth="$year-0$precedingMonth"
	else
	    yearMonth="$year-$precedingMonth"
	fi
    else [ "$(date +%m)" -eq 1 ]
	 precedingMonth=12
	 year="$(($(date +%Y)-1))"
	 yearMonth="$year-$precedingMonth"
    fi
    monthEnglish=$(LANG=en_EN.UTF-8;date -d $year-$precedingMonth-01 +%b)
    generateReport "$monthEnglish" "$year" "$yearMonth"
elif [ "$#" -eq 2 ]; then
    if ! (let "$1") 2>/dev/null; then
	echo -e "Le mois doit être numérique."
	help
    elif ([ "$1" -lt 1 ] || [ "$1" -gt 12 ]); then
	echo -e "Numéro du mois non valable $1."
	help
    elif ! (let "$2") 2>/dev/null; then
	echo -e "L'année doit être numérique."
	help
    elif  [ "$2" -lt 2018 ] || [ "$2" -gt "$(date +%Y)" ]; then
	echo -e "Année non valable $2."
	help
    elif  [ "$2" -le 2017 ] || [ "$2" -ge $(($(date +%Y)+1)) ] ; then
	echo -e "Pas de données pour ce mois."
	help
    else
	if [ "$1" -lt 10 ]; then
	    yearMonth="$2-0$1"
	else
	    yearMonth="$2-$1"
	fi
	monthEnglish=$(LANG=en_EN.UTF-8;date -d "$2-$1-01" +%b)
	year="$2"
	generateReport "$monthEnglish" "$year" "$yearMonth"
    fi
elif [ "$#" -eq 0 ]; then
    yearMonth="$(date +%Y-%m)"
    monthEnglish=$(LANG=en_EN.UTF-8;date +%b)
    year="$(date +%Y)"
    generateReport "$monthEnglish" "$year" "$yearMonth"
else
    echo -e "Bad parameter."
    help
fi