#
# DockerBashOOP - Implementation of BashOOP for Docker.
# Copyright (C) 2021  Ad5001 <mail@ad5001.eu>
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser 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 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/>.
#

property RunningContainer.found
property RunningContainer.id
property RunningContainer.image
property RunningContainer.created
property RunningContainer.status
property RunningContainer.ports
property RunningContainer.name

# Constructor to fetch a running container.
# First argument is what to fetch, and second is matching attribute.
# Example of first arguments: "named" to find by name, "created" to find by creation date, 
# "withid" to find by container id, "withimage" to find by image, "withstatus" to check status, "withport" to find all having this port forwarded....
# NOTE: Multiple containers can be matched. If so, all properties contain the value for each container per line.
# NOTE: If no container is found, a message will be printed, and the constructor will exit with false.
# Signature: (<string matchType>, <string matchValue>)
RunningContainer.constructor() {
    matchType=$1
    matchValue=$2
    lines=""
    case $matchType in
        withid)
            lines="$(RunningContainer.findLineByValue 1 == $matchValue)"
            ;;
        withimage)
            lines="$(RunningContainer.findLineByValue 2 == $matchValue)"
            ;;
        created)
            lines="$(RunningContainer.findLineByValue 4 == $matchValue)"
            ;;
        withstatus)
            lines="$(RunningContainer.findLineByValue 5 == $matchValue)"
            ;;
        withport)
            lines="$(RunningContainer.findLineByValue 6 ~ $matchValue)"
            ;;
        named)
            lines="$(RunningContainer.findLineByValue 7 == $matchValue)"
            if [ -z "$lines" ]; then # Sometimes, when no ports are forwarded, the name is in the 6th field.
                lines="$(RunningContainer.findLineByValue 6 == $matchValue)"
            fi
            ;;
    esac
    if [ ! -z $lines ]; then
        this.found = true
        this.id = "$(echo $lines | awk -F " {2,}" '{ print $1 }')"
        this.image = "$(echo $lines | awk -F " {2,}" '{ print $2 }')"
        this.created = "$(echo $lines | awk -F " {2,}" '{ print $4 }')"
        this.status = "$(echo $lines | awk -F " {2,}" '{ print $5 }')"
        this.ports = "$(echo $lines | awk -F " {2,}" '{ print $6 }')"
        this.name = "$(echo $lines | awk -F " {2,}" '{ print $7 }')"
    else
        this.found = false
    fi
}

# Finds all containers in "docker ps" with a certain field matching a value and returns their lines.
# Signature: (<int fieldId>, <string operation>, <string fieldValue>)
RunningContainer.findLineByValue() {
    fieldId=$1
    operation=$2
    fieldValue=$3
    docker ps | awk -F " {2,}" -v value="$fieldValue" 'NR>1 && $'"$fieldId"' '"$operation"' value'
}