#!/usr/bin/env bash

###
# JItsi Log Observer - command line interface
#
# Bash script for Jitsi Meet components (Videobridge, Jicofo, etc.) logs parsing
# Command line interface (jilo-cli)
###

VERSION="0.1.1"
RELEASE_DATE="2024-06-18"

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" #"

### Configuration file (overrides default configs)
CONFIG_FILE="$SCRIPT_DIR/jilo.conf"

### Default configuration

# Default database type (sqlite, mysql|mariadb)
DEFAULT_DB_TYPE="sqlite"
# Default SQLite database file
DEFAULT_DB="$SCRIPT_DIR/jilo.db"
# Default MySQL/MariaDB configuration
DEFAULT_MYSQL_HOST="localhost"
DEFAULT_MYSQL_USER="jilo"
DEFAULT_MYSQL_PASS="jilopass"
DEFAULT_MYSQL_DB="jilo_db"

DEFAULT_NORMAL_TEXT="\033[0m"
DEFAULT_IMPORTANT_TEXT="\033[1m"

# Load configurations from the config file if it exists
if [[ -f "$CONFIG_FILE" ]]; then
    source "$CONFIG_FILE"
fi

# use default values if not overriden by config file
DB=${DB:-$DEFAULT_DB}
DB_TYPE=${DB_TYPE:-$DEFAULT_DB_TYPE}
MYSQL_HOST=${MYSQL_HOST:-$DEFAULT_MYSQL_HOST}
MYSQL_USER=${MYSQL_USER:-$DEFAULT_MYSQL_USER}
MYSQL_PASS=${MYSQL_PASS:-$DEFAULT_MYSQL_PASS}
MYSQL_DB=${MYSQL_DB:-$DEFAULT_MYSQL_DB}

NORMAL_TEXT=${NORMAL_TEXT:-$DEFAULT_NORMAL_TEXT}
IMPORTANT_TEXT=${IMPORTANT_TEXT:-$DEFAULT_IMPORTANT_TEXT}

### DB queries

## conference related

db_conferences_all_formatted_template="
SELECT DISTINCT
    c.jitsi_component,
    (SELECT ce.time
        FROM conference_events ce
        WHERE
            ce.conference_id = c.conference_id
            AND
            ce.conference_event = 'conference expired')
    AS start,
    (SELECT ce.time
        FROM conference_events ce
        WHERE
            ce.conference_id = c.conference_id
            AND
            ce.conference_event = 'conference created')
    AS end,
    c.conference_id,
    c.conference_name,
    (SELECT COUNT(pe.participant_id)
        FROM participant_events pe
        WHERE
            pe.event_type = 'participant joining'
            AND
            pe.event_param = c.conference_id)
    AS participants,
    name_counts.name_count,
    c.conference_host
FROM
    conferences c
JOIN (
    SELECT
        conference_name,
        COUNT(*) AS name_count
    FROM
        conferences
    GROUP BY
        conference_name
) AS name_counts ON c.conference_name = name_counts.conference_name
JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE (ce.time >= '%s 00:00:00' AND ce.time <= '%s 23:59:59')
ORDER BY
    c.id;"

db_conference_by_id_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    c.conference_id = '%s'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    c.conference_id = '%s'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

db_conference_by_name_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    c.conference_name = '%s'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    c.conference_name = '%s'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

## participant related

db_participants_all_template="
SELECT DISTINCT
    p.jitsi_component, p.endpoint_id, p.conference_id
FROM
    participants p
JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59'
ORDER BY p.id;"

db_conference_by_participant_id_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    p.endpoint_id = '%s'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    participant_id = '%s'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

db_participant_by_conference_id_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    c.conference_id = '%s'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    ce.conference_id = '%s'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

db_participant_by_conference_name_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    c.conference_name LIKE '%%%s%%'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE c.conference_name LIKE '%%%s%%'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

db_participant_by_stats_id_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    pe.event_type = 'stats_id' AND pe.event_param LIKE '%%%s%%'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    event_type = 'stats_id' AND event_param LIKE '%%%s%%'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

db_participant_by_ip_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    pe.event_type = 'pair selected' AND pe.event_param = '%s'
AND (pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59')

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    event_type = 'pair selected' AND event_param = '%s'
AND (event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59')

ORDER BY
    pe.time;"

## jitsi component related

# we use "jitsi_component = %s" (without quotes)
# to re-use the query for all components ("jitsi_component = jitsi_component")
# for specific component the single quotes are added upon loading the template
db_jitsi_components_template="
SELECT jitsi_component, loglevel, time, component_id, event_type, event_param
FROM
    jitsi_components
WHERE
    jitsi_component = %s
AND
    (time >= '%s 00:00:00' AND time <= '%s 23:59:59')
ORDER BY
    time;"

## time period related

db_events_by_period_template="
SELECT
    pe.time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    pe.loglevel,
    pe.event_type,
    p.endpoint_id AS participant_id,
    pe.event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
LEFT JOIN
    participants p ON c.conference_id = p.conference_id
LEFT JOIN
    participant_events pe ON p.endpoint_id = pe.participant_id
WHERE
    pe.time >= '%s 00:00:00' AND pe.time <= '%s 23:59:59'

UNION

SELECT
    ce.time AS event_time,
    c.conference_id,
    c.conference_name,
    c.conference_host,
    ce.loglevel,
    ce.conference_event AS event_type,
    NULL AS participant_id,
    ce.conference_param AS event_param
FROM
    conferences c
LEFT JOIN
    conference_events ce ON c.conference_id = ce.conference_id
WHERE
    event_time >= '%s 00:00:00' AND event_time <= '%s 23:59:59'

ORDER BY
    pe.time;"


help="Usage:
    $0 [OPTION]
    Options:
        --conference|-c [conference ID or name] - show specific conference(s), all of empty
        --participant|-p [participant endpoint ID, conference ID, conference name, participant IP, or participant stats ID] - show specific participant(s), all if empty
        --jitsi-component|-j [jvb|jicofo] - show service level events
        --time|-t - show stats for a time interval; can be use separately ot together with -c, -p, or -j
        --verbose|-v - show more details, when available
        --silent|-s - show less details, more suitable for scripting
        --help|-h - show this help message
        --version|-V - show version"

version="JILO Jitsi Logs Observer command line client
    jilo-cli_${VERSION}_${RELEASE_DATE}
    version $VERSION
    released on $RELEASE_DATE"

time_formats="Expected formats:
- exact times
    YYYY-MM-DD, YYYY-MM, YYYY
- exact periods
    YYYY-MM-DD:YYYY-MM-DD, YYYY-MM:YYYY-MM, YYYY:YYYY
- from begining to given time
    :YYYY-MM-DD, :YYYY-MM, :YYYY
- from given time until end
    YYYY-MM-DD:, YYYY-MM:, YYYY:"


###

# First we check for requirements
check_requirements() {
    # required programs, anything non-bash - edit as needed
    # deb packages - sqlite3, util-linux (column)
    local required_programs=("sqlite3" "column")
    local requirements_missing=''
    for program in "${required_programs[@]}"; do
        if ! command -v "$program" &> /dev/null; then
            requirements_missing+="$program, "
        fi
    done
    if [[ "$requirements_missing" != '' ]]; then
        requirements_missing=${requirements_missing::-2}
        echo "Error: $requirements_missing - not found. Please install to proceed."
        exit 1
    fi
}
check_requirements

###

# DB functions for Sqlite3 and for MySQL/MariaDB

# execute a query and return the result
db_query() {
    local query=$1
    if [[ "$DB_TYPE" == "sqlite" ]]; then
        sqlite3 "$DB" "$query"
    elif [[ "$DB_TYPE" == "mysql" || "$DB_TYPE" == "mariadb" ]]; then
        mysql -h "$MYSQL_HOST" -u "$MYSQL_USER" -p "$MYSQL_PASS" -D "$MYSQL_DB" -se "$query"
    else
        echo "Error: unknown database type $DB_TYPE."
        exit 1
    fi
}

### input parameters parsing

# time parameters
parse_time_range() {
    local time_range="$1"

    ## exact times
    # exact date given (YYYY-MM-DD)
    if [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2})$ ]]; then
        from_time="${BASH_REMATCH[0]}"
        until_time="${BASH_REMATCH[0]}"
    # exact month given (YYYY-MM)
    elif [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2})$ ]]; then
        from_time="${BASH_REMATCH[0]}-01"
        until_time="${BASH_REMATCH[0]}-31"
    # exact year given (YYYY)
    elif [[ "$time_range" =~ ^([0-9]{4})$ ]]; then
        from_time="${BASH_REMATCH[0]}-01-01"
        until_time="${BASH_REMATCH[0]}-12-31"

    ## exact periods
    # from date to date
    elif [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2}):([0-9]{4})-([0-9]{2})-([0-9]{2})$ ]]; then
        from_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-${BASH_REMATCH[3]}"
        until_time="${BASH_REMATCH[4]}-${BASH_REMATCH[5]}-${BASH_REMATCH[6]}"
    # from month to month
    elif [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2}):([0-9]{4})-([0-9]{2})$ ]]; then
        from_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-01"
        until_time="${BASH_REMATCH[3]}-${BASH_REMATCH[4]}-31"
    # from year to year
    elif [[ "$time_range" =~ ^([0-9]{4}):([0-9]{4})$ ]]; then
        from_time="${BASH_REMATCH[1]}-01-01"
        until_time="${BASH_REMATCH[2]}-12-31"

    ## only end time given
    # from begining until date (:YYYY-MM-DD)
    elif [[ "$time_range" =~ ^:([0-9]{4})-([0-9]{2})-([0-9]{2})$ ]]; then
        from_time="0000-01-01"
        until_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-${BASH_REMATCH[3]}"
    # from begining until month (:YYYY-MM)
    elif [[ "$time_range" =~ ^:([0-9]{4})-([0-9]{2})$ ]]; then
        from_time="0000-01-01"
        until_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-31"
    # from begining until year (:YYYY)
    elif [[ "$time_range" =~ ^:([0-9]{4})$ ]]; then
        from_time="0000-01-01"
        until_time="${BASH_REMATCH[0]}-12-31"

    ## only start time given
    # from date until end (YYYY-MM-DD:)
    elif [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2}):$ ]]; then
        from_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-${BASH_REMATCH[3]}"
        until_time="9999-12-31"
    # from month until end (YYYY-MM:)
    elif [[ "$time_range" =~ ^([0-9]{4})-([0-9]{2}):$ ]]; then
        from_time="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}-01"
        until_time="9999-12-31"
    # from year until end (YYYY:)
    elif [[ "$time_range" =~ ^([0-9]{4}):$ ]]; then
        from_time="${BASH_REMATCH[1]}-01-01"
        until_time="9999-12-31"

    else
        echo -e "Invalid time range. $time_formats" >&2
        exit 1
    fi

    time_range_specified=true
}

# we have two timestamps in format YYYY-MM-DD HH:MM:SS.sss
# calculate and return the durtion in format HH:MM:SS
calculate_duration() {
    start=$(date -d "$1" +"%s")
    end=$(date -d "$2" +"%s")
    duration_seconds=$((end - start))
    hours=$((duration_seconds / 3600))
    duration_seconds_remain=$((duration_seconds % 3600))
    minutes=$((duration_seconds_remain / 60))
    seconds=$((duration_seconds_remain % 60))

    # add leading zeroes
    duration=$(printf "%02d:%02d:%02d" $hours $minutes $seconds)
}


### commandline options

conference_arg=""
conference_option=false
participant_arg=""
participant_option=false
component_arg=""
component_option=false
from_time="0000-00-00"
until_time="9999-12-31"
time_option=false
time_range_specified=false

# display help if no arguments
if [[ $# -eq 0 ]]; then
    echo -e "$help"
    exit 0
fi

# then check all the options
while  [[ $# -gt 0 ]]; do
    case "$1" in
        -c | --conference )
            conference_option=true
            if [[ -n "$2" && "$2" != -* ]]; then
                conference_arg="$2"
                shift 2
            else
                shift
            fi
            ;;
        -p | --participant)
            participant_option=true
            if [[ -n "$2" && "$2" != -* ]]; then
                participant_arg="$2"
                shift 2
            else
                shift
            fi
            ;;
        -j | --jitsi-component)
            component_option=true
            if [[ -n "$2" && "$2" != -* ]]; then
                component_arg="$2"
                shift 2
            else
                shift
            fi
            ;;
        -t | --time)
            time_option=true
            if [[ -n "$2" && "$2" != -* ]]; then
                parse_time_range "$2"
                shift 2
            else
                echo "Option -t needs a time range argument. $time_formats" >&2
                exit 1
            fi
            ;;
        -v | --verbose)
            verbose=true
            shift
            ;;
        -s | --silent)
            silent=true
            shift
            ;;
        -h | --help)
            echo -e "$help"
            exit 0
            ;;
        -V | --version)
            echo -e "$version"
            exit 0
            ;;
        *)
            echo "Invalid option: $1" >&2
            echo -e "$help"
            exit 1
            ;;
    esac
done

if [[ "$conference_option" == true ]]; then

    # the argument to "--conference" can be either ID or name
    if [[ -n "$conference_arg" ]]; then

        # check for conferences match within a time period (or all if not period given)
        db_conferences_id=$(printf "$db_conference_by_id_template" "$conference_arg" "$from_time" "$until_time" "$conference_arg" "$from_time" "$until_time")
        mapfile -t conferences_id < <(db_query "$db_conferences_id")
        db_conferences_name=$(printf "$db_conference_by_name_template" "$conference_arg" "$from_time" "$until_time" "$conference_arg" "$from_time" "$until_time")
        mapfile -t conferences_name < <(db_query "$db_conferences_name")

        # we check if the argument to "--conference" is a conference ID
        # conference ID is unique, so we show that conference
        if [[ "${#conferences_id[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nConferences with ID matching \"$IMPORTANT_TEXT$conference_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${conferences_id[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$IMPORTANT_TEXT$conference_id$NORMAL_TEXT\t$conference_name\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'

        # then we check if the argument to "--conference" is a conference name
        # if so, we show all matching conferences (conference names are not unique)
        elif [[ "${#conferences_name[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nConferences with names matching \"$IMPORTANT_TEXT$conference_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output="time\tconf ID\tconf name\tconf host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${conferences_name[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$conference_id\t$IMPORTANT_TEXT$conference_name$NORMAL_TEXT\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'

        # nothing found for neither conference ID or name
        else
            if [[ "$silent" != true ]]; then
                echo "No match found for \"$conference_arg\""
                if [[ "$time_range_specified" == true ]]; then
                    echo "and time period $from_time - $until_time"
                fi
            fi
        fi
        exit 0
    else
        # if no argument is given, we show all the conferences
        db_conferences_all=$(printf "$db_conferences_all_formatted_template" "$from_time" "$until_time")
        mapfile -t conference_array < <(db_query "$db_conferences_all")

        # we only format the outrput if there are conferences to show
        if [[ "${#conference_array[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nAll conferences"
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$IMPORTANT_TEXT$from_time - $until_time$NORMAL_TEXT\""
                fi
                header+="\n"
                echo -e "$header"
                output="component\tduration\tconference ID\tconference name\tparticipants\tname count\tconference host\n"
            fi
            # prepare the formatted rows
            for row in "${conference_array[@]}"; do
                IFS='|' read -r jitsi_component end start conference_id conference_name participants name_count conference_host <<< "$row"
                calculate_duration "$start" "$end"
                output+="$jitsi_component\t$duration\t$conference_id\t$conference_name\t$participants\t$name_count\t$conference_host\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        else
            if [[ "$silent" != true ]]; then
                echo -n "No conferences found"
                if [[ "$time_range_specified" == true ]]; then
                    echo -n " for the time period \"$from_time - $until_time\""
                fi
                echo "."
            fi
        fi
        exit 0
    fi

elif [[ "$participant_option" == true ]]; then

    # the argument to "--participant" can be endpointID, conferenceID, conference name, startsID, IP address
    # check for participants match within a time period (or all if period not given)
    # we check for all ot them and show the matches
## FIXME - we don't catch the case with no results found at all, no message is displayed if no results ## FIXME
    if [[ -n "$participant_arg" ]]; then

        db_participants_endpoint=$(printf "$db_conference_by_participant_id_template" "$participant_arg" "$from_time" "$until_time" "$participant_arg" "$from_time" "$until_time")
        mapfile -t participants_endpoint < <(db_query "$db_participants_endpoint")

        db_participants_conference=$(printf "$db_participant_by_conference_id_template" "$participant_arg" "$from_time" "$until_time" "$participant_arg" "$from_time" "$until_time")
        mapfile -t participants_conference < <(db_query "$db_participants_conference")

        db_participants_conference_name=$(printf "$db_participant_by_conference_name_template" "$participant_arg" "$from_time" "$until_time" "$participant_arg" "$from_time" "$until_time")
        mapfile -t participants_conference_name < <(db_query "$db_participants_conference_name")

        db_participants_statsid=$(printf "$db_participant_by_stats_id_template" "$participant_arg" "$from_time" "$until_time" "$participant_arg" "$from_time" "$until_time")
        mapfile -t participants_statsid < <(db_query "$db_participants_statsid")

        db_participants_ip=$(printf "$db_participant_by_ip_template" "$participant_arg" "$from_time" "$until_time" "$participant_arg" "$from_time" "$until_time")
        mapfile -t participants_ip < <(db_query "$db_participants_ip")

        # match for participant endpoint_id
        if [[ "${#participants_endpoint[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nParticipants with ID matching \"$IMPORTANT_TEXT$participant_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${participants_endpoint[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$conference_id\t$conference_name\t$conference_host\t$loglevel\t$IMPORTANT_TEXT$participant_id$NORMAL_TEXT\t$event_type\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        fi

        # match for conference_id the participant was in
        if [[ "${#participants_conference[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nParticipants in conferences with ID matching \"$IMPORTANT_TEXT$participant_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output+="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${participants_conference[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$IMPORTANT_TEXT$conference_id$NORMAL_TEXT\t$conference_name\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        fi

        # match for conference_name the participant was in
        if [[ "${#participants_conference_name[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nParticipants in conferences with name that include the string \"$IMPORTANT_TEXT$participant_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output+="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${participants_conference_name[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$conference_id\t$IMPORTANT_TEXT$conference_name$NORMAL_TEXT\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        fi

        # match for participant stats_id
        if [[ "${#participants_statsid[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nParticipants with stats ID that include the string \"$IMPORTANT_TEXT$participant_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output+="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${participants_statsid[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$conference_id\t$conference_name\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$IMPORTANT_TEXT$event_param$NORMAL_TEXT\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        fi

        # match for participant IP
        if [[ "${#participants_ip[@]}" -gt 0 ]]; then

            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nParticipants with IP address matching \"$IMPORTANT_TEXT$participant_arg$NORMAL_TEXT\""
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$from_time - $until_time\""
                fi
                header+="\n"
                echo -e "$header"
                output+="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
            fi
            # prepare the formatted rows
            for row in "${participants_ip[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$time\t$conference_id\t$conference_name\t$conference_host\t$loglevel\t$participant_id\t$event_type\t$IMPORTANT_TEXT$event_param$NORMAL_TEXT\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        fi

        exit 0
    else

        # if no argument is given, we show all the participants
        db_participants_all=$(printf "$db_participants_all_template" "$from_time" "$until_time")
        mapfile -t participant_array < <(db_query "$db_participants_all")

        # we only format the outrput if there are conferences to show
        if [[ "${#participant_array[@]}" -gt 0 ]]; then
            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nAll participants"
                if [[ "$time_range_specified" == true ]]; then
                    header+=" for the time period \"$IMPORTANT_TEXT$from_time - $until_time$NORMAL_TEXT\""
                fi
                header+="\n"
                echo -e "$header"
                output+="component\tparticipant ID\tconference ID\n"
            fi
            # prepare the formatted rows
            for row in "${participant_array[@]}"; do
                IFS='|' read -r jitsi_component endpoint_id conference_id <<< "$row"
                output+="$jitsi_component\t$endpoint_id\t$conference_id\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        else
            if [[ "$silent" != true ]]; then
                echo -n "No participants found"
                if [[ "$time_range_specified" == true ]]; then
                    echo -n " for the time period \"$from_time - $until_time\""
                fi
                echo "."
            fi
        fi
        exit 0
    fi

elif [[ "$component_option" == true ]]; then

    # argument for "--jitsi-component | -j" can be "jvb", "jicofo"
    if [[ -n "$component_arg" ]]; then
        case "$component_arg" in
            jvb)
                jitsi_component="'JVB'"
                ;;
            jicofo)
                jitsi_component="'JICOFO'"
                ;;
            *)
                # we have a component events search, but an unknown component string
                # exiting with error, it's not a recognized option argument
                echo "Invalid option: $component_arg" >&2
                echo -e "$help"
                exit 1
                ;;
        esac
        header="\nJitsi components events for \"$IMPORTANT_TEXT$jitsi_component$NORMAL_TEXT\""

    else
        jitsi_component="jitsi_component"
        header="\nJitsi components events for \"$IMPORTANT_TEXT all components$NORMAL_TEXT\""
    fi

    db_jitsi_components=$(printf "$db_jitsi_components_template" "$jitsi_component" "$from_time" "$until_time")
    mapfile -t jitsi_components < <(db_query "$db_jitsi_components")

    output=""
    # prepare the header
    if [[ "$silent" != true ]]; then
        if [[ "$time_range_specified" == true ]]; then
            header+=" for the time period \"$from_time - $until_time\""
        fi
        header+="\n"
        echo -e "$header"
        output+="jitsi_component\tloglevel\ttime\tcomponent ID\tevent\tparameter\n"
    fi
    # prepare the formatted rows
    for row in "${jitsi_components[@]}"; do
        IFS='|' read -r jitsi_component loglevel time component_id event_type event_param <<< "$row"
        output+="$jitsi_component\t$loglevel\t$time\t$component_id\t$event_type\t$event_param\n"
    done
    # output
    echo -e "$output" | column -t -s $'\t'

elif [[ "$time_option" == true ]]; then

    if [[ "$time_range_specified" == true ]]; then
        db_events_time=$(printf "$db_events_by_period_template" "$from_time" "$until_time" "$from_time" "$until_time")
        mapfile -t events_array < <(db_query "$db_events_time")

        if [[ "${#events_array[@]}" -gt 0 ]]; then
            output=""
            # prepare the header
            if [[ "$silent" != true ]]; then
                header="\nEvents in the period \"$IMPORTANT_TEXT$from_time - $until_time$NORMAL_TEXT\"\n"
                output="time\tconference ID\tconference name\tconference host\tloglevel\tparticipant ID\tevent\tparameter\n"
                echo -e "$header"
            fi
            # prepare the formatted rows
            for row in "${events_array[@]}"; do
                IFS='|' read -r time conference_id conference_name conference_host loglevel event_type participant_id event_param <<< "$row"
                output+="$IMPORTANT_TEXT$time$NORMAL_TEXT\t$conference_id\t$conference_name\t$conference_host\t$loglevel\t$event_type\t$participant_id\t$event_param\n"
            done
            # output
            echo -e "$output" | column -t -s $'\t'
        else
            if [[ "$silent" != true ]]; then
                echo -n "No events found"
                if [[ "$time_range_specified" == true ]]; then
                    echo -n " for the time period \"$from_time - $until_time\""
                fi
                echo "."
            fi
        fi
        exit 0
    fi

fi