#!/usr/bin/env bash
# Builds the nasmon binary (linux/amd64, static) and packs it into .deb and .rpm with nfpm.
# Output: dist/nasmon_<version>_amd64.deb and dist/nasmon-<version>.<arch>.rpm
#
# One-time setup:
#   go install github.com/goreleaser/nfpm/v2/cmd/nfpm@latest
#
# Usage:
#   ./build.sh                 # version from git tag, or 0.1.0+<timestamp>
#   VERSION=0.2.0 ./build.sh
#   TEST=1 ./build.sh          # run go vet + go test first

set -euo pipefail

root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
dist="$root/dist"

for tool in go nfpm; do
    command -v "$tool" >/dev/null 2>&1 || { echo "$tool not found - see the setup notes at the top of build.sh" >&2; exit 1; }
done

version="${VERSION:-}"
if [ -z "$version" ] && command -v git >/dev/null 2>&1; then
    tag="$(cd "$root" && git describe --tags --always --dirty 2>/dev/null || true)"
    if [[ "$tag" =~ ^v?([0-9]+\.[0-9]+\.[0-9]+)(-([0-9]+)-g([0-9a-f]+))?(-dirty)?$ ]]; then
        version="${BASH_REMATCH[1]}"
        [ -n "${BASH_REMATCH[3]}" ] && version+="+git${BASH_REMATCH[3]}.${BASH_REMATCH[4]}"
        [ -n "${BASH_REMATCH[5]}" ] && version+=".dirty"
    fi
fi
[ -z "$version" ] && version="0.1.0+$(date +%Y%m%d.%H%M)"

mkdir -p "$dist"

if [ "${TEST:-}" = "1" ]; then
    echo "==> go vet / go test"
    (cd "$root" && go vet ./... && go test ./...)
fi

echo "==> Building nasmon $version (linux/amd64)"
(cd "$root" && GOOS=linux GOARCH=amd64 CGO_ENABLED=0 \
    go build -trimpath -ldflags "-s -w -X main.version=$version" -o "$dist/nasmon" ./cmd/nasmon)

echo "==> Packaging .deb"
rm -f "$dist"/nasmon_*.deb
(cd "$root/packaging" && NASMON_VERSION="$version" nfpm package -f nfpm.yaml -p deb -t "$dist")

echo "==> Packaging .rpm"
rm -f "$dist"/nasmon-*.rpm
(cd "$root/packaging" && NASMON_VERSION="$version" nfpm package -f nfpm.yaml -p rpm -t "$dist")

for pkg in "$dist"/nasmon*.deb "$dist"/nasmon*.rpm; do
    [ -e "$pkg" ] || continue
    size_mb=$(du -m "$pkg" | cut -f1)
    echo "==> $pkg (${size_mb} MB)"
done