#!/usr/bin/env bash
#
# sync-server-image.sh — build or push the mtgc sync server's container image.
#
# The image is tagged ${DOCKER_REGISTRY}/mtgc/sync-server:${IMAGE_TAG}.
#
# Usage:
#   DOCKER_REGISTRY=registry.example.com ./scripts/sync-server-image.sh build
#   DOCKER_REGISTRY=registry.example.com ./scripts/sync-server-image.sh push
#
# Or through npm: `npm run sync-server:build` / `npm run sync-server:push`.
#
# Environment:
#   DOCKER_REGISTRY   (required) registry host, optionally with a namespace path
#   IMAGE_TAG         tag to build/push (default: latest)
#   CONTAINER_ENGINE  docker or podman (default: docker if installed, else podman)
#
# `push` pushes what `build` produced; it doesn't rebuild. Log in to the
# registry first (`docker login "$DOCKER_REGISTRY"`).
#
set -euo pipefail

usage() {
    sed -n '3,20p' "$0" | sed 's/^# \{0,1\}//'
    exit "${1:-0}"
}

[ $# -eq 1 ] || usage 1
case "$1" in
    build | push) action="$1" ;;
    -h | --help) usage ;;
    *) usage 1 ;;
esac

if [ -z "${DOCKER_REGISTRY:-}" ]; then
    echo "sync-server-image: set DOCKER_REGISTRY (e.g. registry.example.com)" >&2
    exit 1
fi

engine="${CONTAINER_ENGINE:-}"
if [ -z "$engine" ]; then
    if command -v docker >/dev/null 2>&1; then
        engine=docker
    elif command -v podman >/dev/null 2>&1; then
        engine=podman
    else
        echo "sync-server-image: neither docker nor podman is installed" >&2
        exit 1
    fi
fi

image="${DOCKER_REGISTRY%/}/mtgc/sync-server:${IMAGE_TAG:-latest}"

# The Dockerfile builds from the workspace root, so run from there whatever
# directory this was invoked in.
repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$repo_root"

case "$action" in
    build)
        echo "==> building $image"
        "$engine" build -f crates/mtgc-server/Dockerfile -t "$image" .
        ;;
    push)
        echo "==> pushing $image"
        "$engine" push "$image"
        ;;
esac