#!/bin/bash
# =============================================================================
# packages/podman-compose/podman-compose.SlackBuild
#
# Packages podman-compose (github.com/containers/podman-compose) — the
# external "compose provider" `podman compose` shells out to (see
# versions.env's PODMAN_COMPOSE_* block for the full story, including why
# this replaces the project's earlier vendored docker-compose). Verified
# live against a real podman install that podman-compose is looked up as a
# plain $PATH command, unlike docker-compose's fixed CLI-plugin-directory
# search — so this installs a wrapper at /usr/local/bin/podman-compose.
#
# podman-compose itself is a single Python script (not a compiled binary),
# with two runtime dependencies — PyYAML and python-dotenv — vendored here
# as plain pure-Python source (no C extension build) since Unraid ships
# Python3 but neither of those modules.
# =============================================================================

set -eu

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
# shellcheck source=/dev/null
. "$REPO_ROOT/scripts/lib/slackbuild-common.sh"
# shellcheck source=/dev/null
. "$REPO_ROOT/versions.env"

VERSION="$PODMAN_COMPOSE_VERSION"
ARCH="$PKG_ARCH"
BUILD="$PKG_BUILD"
TAG="$PKG_TAG"

sb_init "podman-compose"

script=$(sb_fetch_and_verify "$PODMAN_COMPOSE_SRC_URL" "$PODMAN_COMPOSE_SRC_SHA256" "podman_compose-$VERSION.py")
pyyaml_tarball=$(sb_fetch_and_verify "$PYYAML_SRC_URL" "$PYYAML_SRC_SHA256" "pyyaml-$PYYAML_VERSION.tar.gz")
dotenv_tarball=$(sb_fetch_and_verify "$PYTHON_DOTENV_SRC_URL" "$PYTHON_DOTENV_SRC_SHA256" "python-dotenv-$PYTHON_DOTENV_VERSION.tar.gz")

libdir="$PKG/usr/local/lib/podman-compose"
mkdir -p "$libdir"
install -m 0644 "$script" "$libdir/podman_compose.py"

# Only the pure-Python "yaml" package, not the "_yaml" C extension (which
# would need libyaml plus a compiler toolchain this build doesn't otherwise
# require) — see the header comment on why the pure-Python fallback is
# sufficient for what podman-compose actually needs from it.
tar -xzf "$pyyaml_tarball" -C "$TMP" "pyyaml-$PYYAML_VERSION/lib/yaml"
cp -r "$TMP/pyyaml-$PYYAML_VERSION/lib/yaml" "$libdir/yaml"

tar -xzf "$dotenv_tarball" -C "$TMP" "python_dotenv-$PYTHON_DOTENV_VERSION/src/dotenv"
cp -r "$TMP/python_dotenv-$PYTHON_DOTENV_VERSION/src/dotenv" "$libdir/dotenv"

# A thin wrapper, not a symlink or bare shebang: podman_compose.py's own
# shebang (whatever upstream wrote, a plain "#!/usr/bin/env python3") has
# no idea the vendored yaml/dotenv sit right next to it, so PYTHONPATH has
# to be set by whatever actually invokes the script.
install -d "$PKG/usr/local/bin"
cat > "$PKG/usr/local/bin/podman-compose" <<'WRAPPER'
#!/bin/sh
exec env PYTHONPATH="/usr/local/lib/podman-compose${PYTHONPATH:+:$PYTHONPATH}" \
  /usr/bin/python3 /usr/local/lib/podman-compose/podman_compose.py "$@"
WRAPPER
chmod 0755 "$PKG/usr/local/bin/podman-compose"

docdir="$PKG/usr/doc/podman-compose-$VERSION"
mkdir -p "$docdir"
{
  echo "podman-compose $VERSION"
  echo "https://github.com/containers/podman-compose"
  echo
  echo "Vendored alongside its two runtime dependencies (bundled as plain"
  echo "pure-Python source, no C extensions built):"
  echo "  PyYAML $PYYAML_VERSION - https://pypi.org/project/PyYAML/"
  echo "  python-dotenv $PYTHON_DOTENV_VERSION - https://pypi.org/project/python-dotenv/"
  echo
  echo "See versions.env for pinned source URLs and SHA256 checksums."
} > "$docdir/README"
{
  echo "Built by unraid-podman from upstream source."
  echo "Package: podman-compose $VERSION"
  echo "Built:   $(date -u +%Y-%m-%dT%H:%M:%SZ)"
} > "$docdir/unraid-podman.build-info"

sb_make_package "$VERSION" "$ARCH" "$BUILD" "$TAG"