#!/bin/bash

set -euo pipefail

if [[ $# -gt 2 ]]; then
    echo "Usage: $0 [OUTPUT_DIRECTORY] [OUTPUT_FILENAME]" >&2
    exit 2
fi

script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
repo_root="$(cd -- "$script_dir/../.." && pwd)"
output_directory="${1:-$repo_root/flatpak-dist}"
output_name="${2:-KompAC-embedded-x86_64.flatpak}"

if [[ "$output_name" == */* || "$output_name" != *.flatpak ]]; then
    echo "OUTPUT_FILENAME must be a portable filename ending in .flatpak" >&2
    exit 2
fi
if [[ "$(uname -m)" != x86_64 ]]; then
    echo "The Flatpak production build currently supports x86_64 only" >&2
    exit 1
fi
for command in flatpak flatpak-builder appstreamcli; do
    if ! command -v "$command" >/dev/null 2>&1; then
        echo "$command is required to build the Flatpak" >&2
        exit 1
    fi
done

mkdir -p "$output_directory"
output_directory="$(cd -- "$output_directory" && pwd)"

cache_home="${XDG_CACHE_HOME:-${HOME:?HOME is not set}/.cache}"
state_dir="$cache_home/komp-ac-flatpak-builder"
mkdir -p "$state_dir"

work_dir="$(mktemp -d /tmp/komp-ac-flatpak-build.XXXXXX)"
cleanup() {
    case "$work_dir" in
        /tmp/komp-ac-flatpak-build.*)
            rm -rf -- "$work_dir"
            ;;
        *)
            echo "Refusing to remove unexpected Flatpak workspace: $work_dir" >&2
            ;;
    esac
}
trap cleanup EXIT INT TERM HUP

flathub_repository=https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --user --if-not-exists flathub "$flathub_repository"

echo "Building Komp AC against the GNOME 50 Flatpak runtime"
echo "  output: $output_directory/$output_name"
echo "  cache:  $state_dir"
echo

cd "$script_dir"
flatpak-builder \
    --user \
    --install-deps-from=flathub \
    --force-clean \
    --state-dir="$state_dir" \
    --repo="$work_dir/repository" \
    "$work_dir/build" \
    com.kompac.client.yml

flatpak build-bundle \
    --runtime-repo="$flathub_repository" \
    "$work_dir/repository" \
    "$work_dir/$output_name" \
    com.kompac.client \
    stable

cp -- "$work_dir/$output_name" "$output_directory/$output_name"

echo "Created $output_directory/$output_name"