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

packager=${1:?packager must be deb or rpm}
version=${2:?metapackage version is required}
release=${3:?metapackage release is required}
dist_dir=${4:-dist}
nfpm_command=${NFPM:-nfpm}

if [[ "$packager" != "deb" && "$packager" != "rpm" ]]; then
    echo "packager must be deb or rpm" >&2
    exit 1
fi
if [[ ! "$release" =~ ^[1-9][0-9]*$ ]]; then
    echo "metapackage release must be a positive integer" >&2
    exit 1
fi

if [[ "$packager" == "deb" ]]; then
    architecture=all
else
    architecture=noarch
fi

mkdir -p "$dist_dir"

make_metapackage() {
    local name=$1 description=$2
    shift 2
    local config
    config=$(mktemp)
    {
        echo "name: $name"
        echo "arch: $architecture"
        echo "platform: linux"
        echo "version: $version"
        echo "release: $release"
        echo "section: utils"
        echo "priority: optional"
        echo "maintainer: Elias Wendland <eliaswendland@pm.me>"
        echo "description: $description"
        echo "license: GPL-3.0-only"
        echo "homepage: https://git.ewenlau.net/ewenlau/convertis"
        echo "depends:"
        for dependency in "$@"; do
            echo "  - $dependency"
        done
    } > "$config"
    "$nfpm_command" package --config "$config" --packager "$packager" --target "$dist_dir/"
    rm -f "$config"
}

# These dependencies deliberately have no version constraint. Each plugin has
# its own release cycle, so a metapackage must never pin an installed plugin to
# the version that happened to exist when the metapackage was built.
make_metapackage convertis-ffmpeg "All official FFmpeg plugins for Convertis" \
    convertis \
    convertis-ffmpeg-audio \
    convertis-ffmpeg-video \
    convertis-ffmpeg-video-to-frames \
    convertis-ffmpeg-frames-to-video

make_metapackage convertis-image "All official image plugins for Convertis" \
    convertis \
    convertis-native-image \
    convertis-image-ascii \
    convertis-imagemagick \
    convertis-graphicsmagick

make_metapackage convertis-plugins-all "Every official Convertis plugin" \
    convertis \
    convertis-ffmpeg \
    convertis-image \
    convertis-html