#!/usr/bin/env bash
set -euo pipefail

packager=${1:?packager must be deb or rpm}
manifest=${2:?plugin Cargo.toml is required}
release_root=${3:?release target directory is required}
dist_dir=${4:-dist}
nfpm_command=${NFPM:-nfpm}

if [[ "$packager" != "deb" && "$packager" != "rpm" ]]; then
    echo "packager must be deb or rpm" >&2
    exit 1
fi

metadata=$(cargo metadata --format-version 1 --no-deps --manifest-path "$manifest")
manifest_absolute=$(realpath "$manifest")
package_metadata=$(jq -c --arg manifest "$manifest_absolute" \
    '.packages[] | select(.manifest_path == $manifest)' <<<"$metadata")
package=$(jq -r '.name' <<<"$package_metadata")
version=$(jq -r '.version' <<<"$package_metadata")
description=$(jq -r '.description' <<<"$package_metadata")
api_version=$(jq -r '.metadata.convertis["api-version"]' <<<"$package_metadata")
target=$(jq -r '.targets[] | select(.kind | index("cdylib")) | .name' <<<"$package_metadata")
library="lib${target}.so"

if [[ "$api_version" != "2" ]]; then
    echo "$manifest advertises unsupported plugin API $api_version" >&2
    exit 1
fi
if [[ ! -f "$release_root/$library" ]]; then
    echo "plugin library not found: $release_root/$library" >&2
    exit 1
fi

mkdir -p "$dist_dir"
config=$(mktemp)
trap 'rm -f "$config"' EXIT

if [[ "$packager" == "deb" ]]; then
    architecture=amd64
    dependency_key="debian-dependencies"
else
    architecture=x86_64
    dependency_key="rpm-dependencies"
fi

{
    echo "name: $package"
    echo "arch: $architecture"
    echo "platform: linux"
    echo "version: $version"
    echo "release: 1"
    echo "section: utils"
    echo "priority: optional"
    echo "maintainer: Elias Wendland <eliaswendland@pm.me>"
    echo "description: $description"
    echo "license: GPL-3.0-only"
    echo "homepage: https://git.ewenlau.net/ewenlau/convertis"
    echo "contents:"
    echo "  - src: $release_root/$library"
    echo "    dst: /usr/lib/convertis/plugins/$library"
    echo "    file_info:"
    echo "      mode: 0755"
    echo "depends:"
    echo "  - convertis-plugin-api-2"
    jq -r --arg key "$dependency_key" \
        '.metadata.convertis[$key] // [] | .[] | "  - " + .' \
        <<<"$package_metadata"
} >"$config"

"$nfpm_command" package --config "$config" --packager "$packager" --target "$dist_dir/"