#!/usr/bin/env bash
# Build the O3DE Flatpak WITHOUT flatpak-builder.
#
# flatpak-builder runs every build command inside a bubblewrap sandbox, which
# needs user namespaces / a privileged container - awkward in CI. We don't need
# it: our "build" is just unpacking a .deb and running get_python.sh, both plain
# shell. flatpak build-init/build-finish/build-export only touch files and the
# OSTree repo (no bwrap), so this works in an unprivileged container.
#
# Expects ./o3de.deb to already be present. Produces ./repo (an OSTree repo).
set -euo pipefail
cd "$(dirname "$0")/.."

APP_ID=org.o3de.O3DE
RUNTIME=org.freedesktop.Sdk
RUNTIME_VER=24.08
BRANCH=stable

rm -rf build-dir data repo

echo ">> build-init"
flatpak build-init build-dir "$APP_ID" "$RUNTIME" "$RUNTIME" "$RUNTIME_VER"
DEST=build-dir/files

echo ">> extracting .deb payload"
mkdir -p data
ar x o3de.deb
tar -C data -xf data.tar.*
mkdir -p "$DEST/opt"
cp -a data/opt/. "$DEST/opt/"

echo ">> baking O3DE's Python runtime into the image"
# O3DE fetches Python into its install tree on first use, but that tree is
# read-only at runtime in a Flatpak, so populate it now while it is writable.
ENGINE_DIR=$(find "$DEST/opt/O3DE" -mindepth 1 -maxdepth 1 -type d | head -n1)
echo "   engine dir: $ENGINE_DIR"
if [ -x "$ENGINE_DIR/python/get_python.sh" ]; then
  ( cd "$ENGINE_DIR" && HOME="$PWD" ./python/get_python.sh )
else
  echo "   WARNING: get_python.sh not found; Python may fail at runtime" >&2
fi

echo ">> installing launcher + metadata"
install -Dm755 o3de-wrapper.sh "$DEST/bin/o3de-wrapper.sh"
install -Dm644 org.o3de.O3DE.desktop "$DEST/share/applications/$APP_ID.desktop"
install -Dm644 org.o3de.O3DE.metainfo.xml "$DEST/share/metainfo/$APP_ID.metainfo.xml"

echo ">> build-finish (command + sandbox permissions)"
flatpak build-finish build-dir \
  --command=o3de-wrapper.sh \
  --share=ipc \
  --share=network \
  --socket=x11 \
  --socket=wayland \
  --socket=pulseaudio \
  --device=dri \
  --device=all \
  --filesystem=home \
  --talk-name=org.freedesktop.Notifications \
  --env=QT_QPA_PLATFORM=xcb

echo ">> export to OSTree repo"
flatpak build-export repo build-dir "$BRANCH"
flatpak build-update-repo repo --title="O3DE (unofficial Flatpak)" --prune --prune-depth=1

echo ">> done: ./repo"