#!/bin/bash

FIRST_CALL_TO_LOGROTATE="true"

# Use logrotate to manage the logfile
#
# usage: ynh_use_logrotate [--logfile=/log/file] [--specific_user=user/group]
# | arg: -l, --logfile=         - absolute path of logfile
# | arg: -u, --specific_user=   - run logrotate as the specified user and group. If not specified logrotate is runned as root.
#
# If no `--logfile` is provided, `/var/log/$app` will be used as default.
# `logfile` can point to a directory or a file.
#
# Requires YunoHost version 2.6.4 or higher.
ynh_use_logrotate() {

    # Stupid patch to ignore legacy --non-append and --nonappend
    # which was never properly understood and improperly used and kind of bullshit
    local all_args=( ${@} )
    for I in $(seq 0 $(($# - 1)))
    do
        if [[ "${all_args[$I]}" == "--non-append" ]] || [[ "${all_args[$I]}" == "--nonappend" ]]
        then
            unset all_args[$I]
        fi
    done
    set -- "${all_args[@]}"

    # Argument parsing
    local legacy_args=lu
    local -A args_array=([l]=logfile= [u]=specific_user=)
    local logfile
    local specific_user
    ynh_handle_getopts_args "$@"
    logfile="${logfile:-}"
    specific_user="${specific_user:-}"

    set -o noglob
    if [[ -z "$logfile" ]]; then
        logfile="/var/log/${app}/*.log"
    elif [[ "${logfile##*.}" != "log" ]] && [[ "${logfile##*.}" != "txt" ]]; then
        logfile="$logfile/*.log"
    fi
    set +o noglob

    for stuff in $logfile
    do
        mkdir --parents $(dirname "$stuff")
    done

    local su_directive=""
    if [[ -n "$specific_user" ]]; then
        su_directive="su ${specific_user%/*} ${specific_user#*/}"
    fi

    local tempconf="$(mktemp)"
    cat << EOF >$tempconf
$logfile {
    # Rotate if the logfile exceeds 100Mo
    size 100M
    # Keep 12 old log maximum
    rotate 12
    # Compress the logs with gzip
    compress
    # Compress the log at the next cycle. So keep always 2 non compressed logs
    delaycompress
    # Copy and truncate the log to allow to continue write on it. Instead of moving the log.
    copytruncate
    # Do not trigger an error if the log is missing
    missingok
    # Do not rotate if the log is empty
    notifempty
    # Keep old logs in the same dir
    noolddir
    $su_directive
}
EOF

    if [[ "$FIRST_CALL_TO_LOGROTATE" == "true" ]]
    then
        cat $tempconf > /etc/logrotate.d/$app
    else
        cat $tempconf >> /etc/logrotate.d/$app
    fi

    FIRST_CALL_TO_LOGROTATE="false"

    # Make sure permissions are correct (otherwise the config file could be ignored and the corresponding logs never rotated)
    chmod 644 "/etc/logrotate.d/$app"
    mkdir -p "/var/log/$app"
    chmod 750 "/var/log/$app"
}

# Remove the app's logrotate config.
#
# usage: ynh_remove_logrotate
#
# Requires YunoHost version 2.6.4 or higher.
ynh_remove_logrotate() {
    if [ -e "/etc/logrotate.d/$app" ]; then
        rm "/etc/logrotate.d/$app"
    fi
}