#!/usr/bin/env bash
# modules/docker/proxy.module.sh
#
# Proxy docker module.
# Configures proxy, generates what's needed to compose docker stack --
# and starts/stops the proxy service.

function docker::proxy::running() { docker::raw ps --format '{{.Names}}' | grep -qx "${PROXY_SERVICE}"; }
function docker::proxy::exists()  { docker::raw ps -a --format '{{.Names}}' | grep -qx "${PROXY_SERVICE}"; }

function docker::proxy::traefik_labels() {
  local service="$1"
  local domain="$2"
  local backend_domain="$3"
  local port="$4"

  cat <<EOF
- "traefik.enable=true"
        - "traefik.docker.network=${PROXY_NETWORK}"

        - "traefik.http.routers.${service}-frontend.rule=Host(\`${domain}\`)"
        - "traefik.http.routers.${service}-frontend.entrypoints=web"
        - "traefik.http.routers.${service}-frontend.service=${service}"

        - "traefik.http.routers.${service}-backend.rule=Host(\`${backend_domain}\`)"
        - "traefik.http.routers.${service}-backend.entrypoints=web"
        - "traefik.http.routers.${service}-backend.service=${service}"

        - "traefik.http.services.${service}.loadbalancer.server.port=${port}"
EOF
}

function docker::proxy::start() {
  docker::proxy::running && return 0
  docker::proxy::exists && {
    docker::raw start "$PROXY_SERVICE" > /dev/null 2>&1
    return 0
  };

  docker::proxy::_create_container
}

function docker::proxy::stop() {
  if docker::proxy::running "${PROXY_SERVICE}"; then
    docker::raw stop "${PROXY_SERVICE}" > /dev/null 2>&1
  fi
}

function docker::proxy::restart() {
  if docker::proxy::running "${PROXY_SERVICE}"; then
    docker::raw restart "${PROXY_SERVICE}" > /dev/null 2>&1
  fi
}

function docker::proxy::ensure_network() {
  docker::raw network inspect "${PROXY_NETWORK}" >/dev/null 2>&1 || \
  docker::raw network create "${PROXY_NETWORK}"
}

function docker::proxy::ensure_proxy_running() {
  docker::proxy::ensure_network
  docker::proxy::start
}

# ============================================
# Logs
# ============================================

function docker::proxy::logs() {
  docker::raw logs -f "${PROXY_SERVICE}"
}

# ============================================
# Private
# ============================================

function docker::proxy::_create_container() {
  docker::raw run -d \
    --name "$PROXY_SERVICE" \
    --restart unless-stopped \
    -p 80:80 -p 443:443 -p 8080:8080 \
    -v /var/run/docker.sock:/var/run/docker.sock:ro \
    --network "$PROXY_NETWORK" \
    traefik:v3.0 \
    --api.dashboard=true --api.insecure=true \
    --providers.docker=true \
    --providers.docker.exposedbydefault=false \
    --providers.docker.network="$PROXY_NETWORK" \
    --entrypoints.web.address=:80 \
    --entrypoints.websecure.address=:443 \
    --log.level=DEBUG \
    > /dev/null 2>&1
}