#!/usr/bin/env bash
# vim:syn=sh:ts=4:sw=4:et:ai

shopt -s nullglob

# Optional pre-load script
if [ -f meshvars.sh ]; then
    source meshvars.sh
fi

if [ ! -z "$AWS_PROFILE" ]; then
    PROFILE_OPT="--profile ${AWS_PROFILE}"
fi

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
UPDATE_ROUTES_DIR="${DIR}/config/update_routes/"

source "$DIR/.region-config.sh"

: ${AWS_DEFAULT_REGION:=$DEFAULT_REGION}

if [ "$APPMESH_ENDPOINT" = "" ]; then
    appmesh_cmd="aws appmesh"
else
    appmesh_cmd="aws --endpoint-url "${APPMESH_ENDPOINT}" appmesh"
fi

print() {
    printf "[MESH] [$(date)] : %s\n" "$*"
}

err() {
    msg="Error: $1"
    print "${msg}"
    code=${2:-"1"}
    exit ${code}
}

contains() {
    local e match="$1"
    shift
    for e; do [[ "$e" == "$match" ]] && return 0; done
    return 1
}

sanity_check() {
    if ! contains "${AWS_DEFAULT_REGION}" "${SUPPORTED_REGIONS[@]}"; then
        err "Region ${AWS_DEFAULT_REGION} is not supported at this time (Supported regions: ${SUPPORTED_REGIONS[*]})"
    fi

    if [ -z "${MESH_NAME}" ]; then
        err "MESH_NAME is not set"
    fi
}

update_route() {
    route_spec_file=$1
    cmd=( $appmesh_cmd update-route --mesh-name "${MESH_NAME}" \
                ${PROFILE_OPT} \
                --cli-input-json "file:///${route_spec_file}" \
                --query route.metadata.uid --output text )
    print "${cmd[@]}"
    uid=$("${cmd[@]}") || err "Unable to update route" "$?"
    print "--> ${uid}"
}

main() {
    sanity_check
    files=($(ls "${UPDATE_ROUTES_DIR}"))
    while true; do \
        f=${files[$RANDOM % ${#files[@]}]}
        print "Using route in file ${f}"
        update_route "${UPDATE_ROUTES_DIR}/${f}"
        sleep ${SLEEP_TIME:-"600s"}
    done
}

main