#!/usr/bin/env bash

set -euo pipefail

PROVENANCE_ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd -- "${PROVENANCE_ROOT}/../.." && pwd)"
SOURCE_ARCHIVE_DIRECTORY="${1:-${PROJECT_ROOT}/.artifacts/native/gamescope/sources}"
OUTPUT_DIRECTORY="${2:-${PROJECT_ROOT}/.artifacts/native/gamescope}"
ARTIFACT_NAME="gamescope-3.16.20-ubuntu26.04-amd64"
SHIPPED_ARTIFACT="${PROJECT_ROOT}/src/ptlinux/native/${ARTIFACT_NAME}"

if [[ ! -d "$SOURCE_ARCHIVE_DIRECTORY" ]]
then
	printf 'Gamescope source-archive directory does not exist: %s\n' \
		"$SOURCE_ARCHIVE_DIRECTORY" >&2
	exit 2
fi
mkdir -p -- "$OUTPUT_DIRECTORY"
SOURCE_ARCHIVE_DIRECTORY="$(cd -- "$SOURCE_ARCHIVE_DIRECTORY" && pwd)"
OUTPUT_DIRECTORY="$(cd -- "$OUTPUT_DIRECTORY" && pwd)"
if [[ "${OUTPUT_DIRECTORY}/${ARTIFACT_NAME}" == "$SHIPPED_ARTIFACT" ]]
then
	printf '%s\n' "Refusing to overwrite the shipped Gamescope executable." >&2
	exit 2
fi

(
	cd "$SOURCE_ARCHIVE_DIRECTORY"
	sha256sum --check "${PROVENANCE_ROOT}/source.sha256"
)

if [[ -n "${CONTAINER_ENGINE:-}" ]]
then
	ENGINE="$CONTAINER_ENGINE"
elif command -v podman >/dev/null 2>&1
then
	ENGINE="podman"
elif command -v docker >/dev/null 2>&1
then
	ENGINE="docker"
else
	printf '%s\n' "Docker or Podman is required to rebuild Gamescope." >&2
	exit 1
fi
if ! command -v "$ENGINE" >/dev/null 2>&1
then
	printf 'Container engine was not found: %s\n' "$ENGINE" >&2
	exit 1
fi

rm -f -- "${OUTPUT_DIRECTORY}/${ARTIFACT_NAME}"
"$ENGINE" run --rm --platform linux/amd64 \
	--env "HOST_UID=$(id -u)" \
	--env "HOST_GID=$(id -g)" \
	--volume "${PROJECT_ROOT}:/workspace:ro" \
	--volume "${SOURCE_ARCHIVE_DIRECTORY}:/sources:ro" \
	--volume "${OUTPUT_DIRECTORY}:/output" \
	ubuntu:26.04 \
	bash /workspace/native/gamescope/build-in-container.sh
(
	cd "$OUTPUT_DIRECTORY"
	sha256sum --check "${PROVENANCE_ROOT}/binary.sha256"
)