# NB only to be sourced

set -e

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

# Protect against being sourced multiple times to prevent
# overwriting assert.sh global state
if ! [ -z "$SOURCED_CONFIG_SH" ]; then
    return
fi
SOURCED_CONFIG_SH=true

# these ought to match what is in Vagrantfile
N_MACHINES=${N_MACHINES:-3}
IP_PREFIX=${IP_PREFIX:-192.168.48}
IP_SUFFIX_BASE=${IP_SUFFIX_BASE:-10}

if [ -z "$HOSTS" ] ; then
    for i in $(seq 1 $N_MACHINES); do
        IP="${IP_PREFIX}.$((${IP_SUFFIX_BASE}+$i))"
        HOSTS="$HOSTS $IP"
    done
fi

# these are used by the tests
HOST1=$(echo $HOSTS | cut -f 1 -d ' ')
HOST2=$(echo $HOSTS | cut -f 2 -d ' ')
HOST3=$(echo $HOSTS | cut -f 3 -d ' ')

. "$DIR/assert.sh"

SSH_DIR=${SSH_DIR:-$DIR}
SSH=${SSH:-ssh -l vagrant -i "$SSH_DIR/insecure_private_key" -o "UserKnownHostsFile=$SSH_DIR/.ssh_known_hosts" -o CheckHostIP=no -o StrictHostKeyChecking=no}

SMALL_IMAGE="alpine"
TEST_IMAGES="$SMALL_IMAGE"

PING="ping -nq -W 1 -c 1"
DOCKER_PORT=2375

remote() {
    rem=$1
    shift 1
    "$@" > >(while read line; do echo -e $'\e[0;34m'"$rem>"$'\e[0m'" $line"; done)
}

colourise() {
    [ -t 0 ] && echo -ne $'\e['$1'm' || true
    shift
    # It's important that we don't do this in a subshell, as some
    # commands we execute need to modify global state
    "$@"
    [ -t 0 ] && echo -ne $'\e[0m' || true
}

whitely() {
    colourise '1;37' "$@"
}

greyly () {
    colourise '0;37' "$@"
}

redly() {
    colourise '1;31' "$@"
}

greenly() {
    colourise '1;32' "$@"
}

run_on() {
    host=$1
    shift 1
    [ -z "$DEBUG" ] || greyly echo "Running on $host: $@" >&2
    remote $host $SSH $host "$@"
}

docker_on() {
    host=$1
    shift 1
    [ -z "$DEBUG" ] || greyly echo "Docker on $host:$DOCKER_PORT: $@" >&2
    docker -H tcp://$host:$DOCKER_PORT "$@"
}

weave_on() {
    host=$1
    shift 1
    [ -z "$DEBUG" ] || greyly echo "Weave on $host:$DOCKER_PORT: $@" >&2
    DOCKER_HOST=tcp://$host:$DOCKER_PORT $WEAVE "$@"
}

exec_on() {
    host=$1
    container=$2
    shift 2
    docker -H tcp://$host:$DOCKER_PORT exec $container "$@"
}

rm_containers() {
    host=$1
    shift
    [ $# -eq 0 ] || docker_on $host rm -f "$@" >/dev/null
}

start_suite() {
    for host in $HOSTS; do
        [ -z "$DEBUG" ] || echo "Cleaning up on $host: removing all containers and resetting weave"
        PLUGIN_ID=$(docker_on $host ps -aq --filter=name=weaveplugin)
        PLUGIN_FILTER="cat"
        [ -n "$PLUGIN_ID" ] && PLUGIN_FILTER="grep -v $PLUGIN_ID"
        rm_containers $host $(docker_on $host ps -aq 2>/dev/null | $PLUGIN_FILTER)
        run_on $host "docker network ls | grep -q ' weave ' && docker network rm weave" || true
        weave_on $host reset 2>/dev/null
    done
    whitely echo "$@"
}

end_suite() {
    whitely assert_end
}

WEAVE=$DIR/../weave