#!/bin/sh
set -eu

script_dir=$(CDPATH= cd "$(dirname "$0")" && pwd -P)
# shellcheck source=release-lib.sh
. "$script_dir/release-lib.sh"

tool_name=build-release-assets

if [ "$#" -ne 2 ]; then
	narratio_release_fail "$tool_name" 'usage: scripts/build-release-assets.sh VERSION OUTPUT_DIR'
fi

release_version=$1
output_dir=$2
if ! narratio_release_validate_version "$release_version"; then
	narratio_release_fail "$tool_name" "invalid stable version: $release_version"
fi

case $output_dir in
	/*) ;;
	*) narratio_release_fail "$tool_name" "output directory must be absolute: $output_dir" ;;
esac

repo_root=$(narratio_release_repo_root "$0") || narratio_release_fail "$tool_name" 'cannot locate repository root'
if ! cd "$repo_root"; then
	narratio_release_fail "$tool_name" "cannot enter repository root: $repo_root"
fi
if [ "$output_dir" = / ]; then
	narratio_release_fail "$tool_name" 'output directory must not be /'
fi
if [ -L "$output_dir" ]; then
	narratio_release_fail "$tool_name" "output directory must not be a symlink: $output_dir"
fi
if [ -e "$output_dir" ]; then
	if [ ! -d "$output_dir" ]; then
		narratio_release_fail "$tool_name" "output path must be a directory: $output_dir"
	fi
	resolved_output_dir=$(CDPATH= cd "$output_dir" && pwd -P) || narratio_release_fail "$tool_name" "cannot access output directory: $output_dir"
	if [ "$resolved_output_dir" = "$repo_root" ]; then
		narratio_release_fail "$tool_name" 'output directory must not be the repository root'
	fi
	for existing_entry in "$output_dir"/* "$output_dir"/.[!.]* "$output_dir"/..?*; do
		if [ -e "$existing_entry" ] || [ -L "$existing_entry" ]; then
			narratio_release_fail "$tool_name" "output directory must be empty: $output_dir"
		fi
	done
else
	if ! mkdir "$output_dir"; then
		narratio_release_fail "$tool_name" "cannot create output directory: $output_dir"
	fi
fi

temporary_smoke_binary=
cleanup_temporary_smoke_binary() {
	if [ -n "$temporary_smoke_binary" ]; then
		rm -f "$temporary_smoke_binary"
	fi
}
trap cleanup_temporary_smoke_binary 0 HUP INT TERM

build_flags="-s -w -X gitea.maximumdirect.net/eric/narratio/internal/buildinfo.Version=$release_version"
host_os=$(go env GOOS)
host_arch=$(go env GOARCH)
host_asset=

for target in linux/amd64 linux/arm64 darwin/amd64 darwin/arm64 windows/amd64 windows/arm64; do
	target_os=${target%%/*}
	target_arch=${target#*/}
	suffix=
	if [ "$target_os" = windows ]; then
		suffix=.exe
	fi
	asset_path="$output_dir/narratio-$release_version-$target_os-$target_arch$suffix"
	CGO_ENABLED=0 GOOS="$target_os" GOARCH="$target_arch" go build -trimpath -ldflags "$build_flags" -o "$asset_path" ./cmd/narratio
	if [ "$target_os" = "$host_os" ] && [ "$target_arch" = "$host_arch" ]; then
		host_asset=$asset_path
	fi
done

if [ -z "$host_asset" ]; then
	temporary_smoke_binary="$output_dir/.narratio-release-version-smoke"
	CGO_ENABLED=0 go build -trimpath -ldflags "$build_flags" -o "$temporary_smoke_binary" ./cmd/narratio
	host_asset=$temporary_smoke_binary
fi

reported_version=$("$host_asset" version)
if [ "$reported_version" != "narratio $release_version" ]; then
	narratio_release_fail "$tool_name" "release binary reported unexpected version: $reported_version"
fi

cleanup_temporary_smoke_binary
temporary_smoke_binary=