#!/usr/bin/env bash
#
# Fixed pipeline (do not reorder or skip steps):
#   1. git add -A
#   2. git commit (normal if staged changes exist, else --allow-empty with the same message)
#   3. GIT_COMMIT = current HEAD (baked into Go binaries inside each image via Dockerfile ARG)
#   4. docker login ghcr.io
#   5. For each of server + client targets: per-arch buildx --push (linux/amd64, linux/arm64), then imagetools manifest
#   6. git push GIT_REMOTE BRANCH
#
# Usage: ./ship.sh <commit message>
# Requires: git, docker (buildx), gh; remote "github"; gh token with write:packages for GHCR.
#
# Multi-arch: Intel/AMD 64-bit (linux/amd64) and ARM64 (linux/arm64), one manifest tag each for server and client.

set -euo pipefail

if [[ $# -lt 1 ]] || [[ -z "${1// }" ]]; then
	echo "usage: $0 <commit message>" >&2
	exit 1
fi
COMMIT_MSG="$*"

ROOT="$(cd "$(dirname "$0")" && pwd)"
cd "$ROOT"

# --- release targets (edit only here) ---
GITHUB_OWNER="Leopere"
REGISTRY_BASE="ghcr.io/leopere/better-argo-tunnels"
TAG_SERVER="production"
TAG_CLIENT="client-production"
# Exactly two platforms → one multi-arch manifest per image (amd64 + arm64).
PLATFORMS="linux/amd64,linux/arm64"
GIT_REMOTE="github"
# --- end ---

for cmd in git docker gh; do
	command -v "$cmd" >/dev/null 2>&1 || {
		echo "ship: fatal: missing required command: $cmd" >&2
		exit 1
	}
done
if ! docker buildx version >/dev/null 2>&1; then
	echo "ship: fatal: docker buildx not available" >&2
	exit 1
fi

BRANCH="$(git branch --show-current)"
if [[ -z "$BRANCH" ]]; then
	echo "ship: fatal: detached HEAD" >&2
	exit 1
fi
if ! git remote get-url "$GIT_REMOTE" >/dev/null 2>&1; then
	echo "ship: fatal: git remote '$GIT_REMOTE' is not configured" >&2
	exit 1
fi

echo "==> [1/6] git add -A"
git add -A

echo "==> [2/6] git commit"
if git diff --cached --quiet; then
	git commit --allow-empty -m "$COMMIT_MSG"
else
	git commit -m "$COMMIT_MSG"
fi

GIT_COMMIT="$(git rev-parse HEAD)"
BA=(--build-arg "GIT_COMMIT=${GIT_COMMIT}")
echo "==> GIT_COMMIT=${GIT_COMMIT}"

echo "==> [3/6] docker login ghcr.io"
if ! token="$(gh auth token)" || [[ -z "${token}" ]]; then
	echo "ship: fatal: gh auth token empty" >&2
	exit 1
fi
if ! printf '%s' "$token" | docker login ghcr.io -u "$GITHUB_OWNER" --password-stdin; then
	echo "ship: fatal: docker login ghcr.io failed (need: gh auth refresh -h github.com -s write:packages -s read:packages)" >&2
	exit 1
fi

pick_builder() {
	if docker buildx inspect orbstack >/dev/null 2>&1; then
		echo "orbstack"
	else
		echo "default"
	fi
}

platform_slug() {
	local p="${1// /}"
	p="${p#linux/}"
	echo "${p//\//-}"
}

# Per-arch push then single multi-arch manifest (orbstack/docker driver compatible).
push_multi() {
	local target="$1"
	local final_tag="$2"
	local builder="$3"
	local base="${final_tag%:*}"
	local name="${final_tag##*:}"
	local arch_refs=()
	local p slug arch_tag

	IFS=',' read -ra plats <<< "$PLATFORMS"
	for p in "${plats[@]}"; do
		p="${p// /}"
		[[ -z "$p" ]] && continue
		slug="$(platform_slug "$p")"
		arch_tag="${base}:${name}-${slug}"
		echo "==> [4/6] docker buildx push ${target} ${p} -> ${arch_tag}"
		docker buildx build \
			"${BA[@]}" \
			--builder "$builder" \
			--platform "$p" \
			--target "$target" \
			-t "$arch_tag" \
			--push \
			--provenance=false \
			"$ROOT"
		arch_refs+=("$arch_tag")
	done
	echo "==> [5/6] imagetools manifest ${final_tag}"
	docker buildx imagetools create -t "$final_tag" "${arch_refs[@]}"
}

BUILDER="$(pick_builder)"
echo "==> buildx builder: ${BUILDER}"
SERVER_TAG="${REGISTRY_BASE}:${TAG_SERVER}"
CLIENT_TAG="${REGISTRY_BASE}:${TAG_CLIENT}"

push_multi server "$SERVER_TAG" "$BUILDER"
push_multi client "$CLIENT_TAG" "$BUILDER"

echo "==> [6/6] git push ${GIT_REMOTE} ${BRANCH}"
git push "$GIT_REMOTE" "$BRANCH"

echo "ship: ok commit=${GIT_COMMIT}"
echo "ship: images ${SERVER_TAG} ${CLIENT_TAG} (multi-arch: ${PLATFORMS})"