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

packager=${1:?packager must be deb or rpm}
version=${2:?version is required}
release_root=${3:?release target directory is required}
dist_dir=${4:-dist}
mkdir -p "$dist_dir"

if [[ "$packager" == "deb" ]]; then
    architecture=amd64
    engine_dependency="convertis (= ${version}-1)"
    system_dependencies=("libc6" "libgcc-s1")
    ffmpeg_dependencies=("ffmpeg")
    imagemagick_dependencies=("imagemagick")
    graphicsmagick_dependencies=("graphicsmagick")
else
    architecture=amd64
    engine_dependency="convertis = ${version}-1"
    system_dependencies=("glibc" "libgcc")
    ffmpeg_dependencies=("/usr/bin/ffmpeg" "/usr/bin/ffprobe")
    imagemagick_dependencies=("/usr/bin/magick")
    graphicsmagick_dependencies=("/usr/bin/gm")
fi

make_package() {
    local name=$1 description=$2
    shift 2
    local config
    config=$(mktemp)
    local contents=()
    while [[ $# -gt 0 && "$1" == content:* ]]; do
        contents+=("${1#content:}")
        shift
    done
    local dependencies=("$@")
    {
        echo "name: $name"
        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"
        if [[ ${#contents[@]} -gt 0 ]]; then
            echo "contents:"
            for mapping in "${contents[@]}"; do
                destination=${mapping#*::}
                echo "  - src: ${mapping%%::*}"
                echo "    dst: $destination"
                echo "    file_info:"
                if [[ "$destination" == /usr/bin/* || "$destination" == *.so ]]; then
                    echo "      mode: 0755"
                else
                    echo "      mode: 0644"
                fi
            done
        fi
        if [[ ${#dependencies[@]} -gt 0 ]]; then
            echo "depends:"
            for dependency in "${dependencies[@]}"; do
                echo "  - $dependency"
            done
        fi
    } > "$config"
    nfpm package --config "$config" --packager "$packager" --target "$dist_dir/"
    rm -f "$config"
}

exact_dependency() {
    if [[ "$packager" == "deb" ]]; then
        printf '%s (= %s-1)' "$1" "$version"
    else
        printf '%s = %s-1' "$1" "$version"
    fi
}

make_package convertis "Plugin-based universal file converter" \
    "content:${release_root}/convertis::/usr/bin/convertis" \
    "content:target/man/convertis.1::/usr/share/man/man1/convertis.1" \
    "content:README.md::/usr/share/doc/convertis/README.md" \
    "content:LICENSE::/usr/share/doc/convertis/LICENSE" \
    "content:packaging/plugin-catalog.json::/usr/share/convertis/plugin-catalog.json" \
    "${system_dependencies[@]}"

plugin_package() {
    local package=$1 library=$2 description=$3 dependency_group=${4:-none}
    local dependencies=("$engine_dependency")
    case "$dependency_group" in
        ffmpeg) dependencies+=("${ffmpeg_dependencies[@]}") ;;
        imagemagick) dependencies+=("${imagemagick_dependencies[@]}") ;;
        graphicsmagick) dependencies+=("${graphicsmagick_dependencies[@]}") ;;
    esac
    make_package "$package" "$description" \
        "content:${release_root}/${library}::/usr/lib/convertis/plugins/${library}" \
        "${dependencies[@]}"
}

plugin_package convertis-ffmpeg-audio libconvertis_ffmpeg_audio.so "FFmpeg audio plugin for Convertis" ffmpeg
plugin_package convertis-ffmpeg-video libconvertis_ffmpeg_video.so "FFmpeg video plugin for Convertis" ffmpeg
plugin_package convertis-ffmpeg-video-to-frames libconvertis_ffmpeg_video_to_frames.so "FFmpeg video-to-frames plugin for Convertis" ffmpeg
plugin_package convertis-ffmpeg-frames-to-video libconvertis_ffmpeg_frames_to_video.so "FFmpeg frames-to-video plugin for Convertis" ffmpeg
plugin_package convertis-native-image libconvertis_native_image.so "Native common-image plugin for Convertis"
plugin_package convertis-image-ascii libconvertis_image_ascii.so "Image-to-ASCII plugin for Convertis"
plugin_package convertis-html libconvertis_html.so "Self-contained HTML plugin for Convertis"
plugin_package convertis-imagemagick libconvertis_imagemagick.so "ImageMagick plugin for Convertis" imagemagick
plugin_package convertis-graphicsmagick libconvertis_graphicsmagick.so "GraphicsMagick plugin for Convertis" graphicsmagick

make_package convertis-ffmpeg "All official FFmpeg plugins for Convertis" \
    "$engine_dependency" \
    "$(exact_dependency convertis-ffmpeg-audio)" \
    "$(exact_dependency convertis-ffmpeg-video)" \
    "$(exact_dependency convertis-ffmpeg-video-to-frames)" \
    "$(exact_dependency convertis-ffmpeg-frames-to-video)"

make_package convertis-image "All official image plugins for Convertis" \
    "$engine_dependency" \
    "$(exact_dependency convertis-native-image)" \
    "$(exact_dependency convertis-image-ascii)" \
    "$(exact_dependency convertis-imagemagick)" \
    "$(exact_dependency convertis-graphicsmagick)"

make_package convertis-plugins-all "Every official Convertis plugin" \
    "$engine_dependency" \
    "$(exact_dependency convertis-ffmpeg)" \
    "$(exact_dependency convertis-image)" \
    "$(exact_dependency convertis-html)"