#!/bin/bash
# Clone a versitygw release tag into a local source tree, ready for
# patch application.  Mirrors the scoutfs-build clone-source.sh tag
# selection logic.
#
# Environment:
#   VGW_REPO_URL  upstream git URL (default github.com/versity/versitygw)
#   VGW_TAG       explicit tag to build (set by the CI matrix from
#                 ci/support-matrix.yaml).  Highest priority.
#   VGW_SRC_DIR   where to put the checkout (default: src)
#
# Tag selection priority:
#   1. VGW_TAG env (matrix / manual single-version run)
#   2. GITHUB_REF_NAME when this run was triggered by a tag push
#   3. latest remote vX.Y.Z tag
#
# Exports VGW_VERSION / VGW_TAG / VGW_SRC_DIR to GITHUB_ENV when run
# under Gitea Actions.
set -euo pipefail

VGW_REPO_URL="${VGW_REPO_URL:-https://github.com/versity/versitygw.git}"
VGW_SRC_DIR="${VGW_SRC_DIR:-src}"

if [[ -n "${VGW_TAG:-}" ]]; then
    TAG="${VGW_TAG}"
    echo ">>> Using VGW_TAG from env: ${TAG}"
elif [[ "${GITHUB_REF:-}" == refs/tags/* ]]; then
    TAG="${GITHUB_REF_NAME:-${GITHUB_REF#refs/tags/}}"
    echo ">>> Using tag from push event: ${TAG}"
else
    echo ">>> Discovering latest release tag from ${VGW_REPO_URL}..."
    TAG=$(git ls-remote --tags --sort=-v:refname "${VGW_REPO_URL}" 'refs/tags/v*' \
        | grep -v '\^{}' \
        | head -1 \
        | sed 's|.*refs/tags/||')
    [[ -n "$TAG" ]] || { echo "ERROR: no release tags found in ${VGW_REPO_URL}" >&2; exit 1; }
    echo ">>> Latest release tag: ${TAG}"
fi

echo ">>> Cloning ${VGW_REPO_URL} at ${TAG}..."
rm -rf "${VGW_SRC_DIR}"
# autocrlf=false keeps the checkout byte-identical to upstream (LF) so
# the LF patches in patches/ apply cleanly regardless of host platform.
git -c core.autocrlf=false clone --depth 1 --branch "${TAG}" \
    "${VGW_REPO_URL}" "${VGW_SRC_DIR}"

# git am needs a clean worktree, LF line endings, and a committer
# identity inside the source tree.  CI runners don't set these.
git -C "${VGW_SRC_DIR}" config core.autocrlf false
git -C "${VGW_SRC_DIR}" config user.email "ci@s3-gateway.local"
git -C "${VGW_SRC_DIR}" config user.name  "s3-gateway CI"

VGW_VERSION="${TAG#v}"
echo ">>> versitygw version: ${VGW_VERSION}"
echo ">>> source directory:  ${VGW_SRC_DIR}"

if [[ -n "${GITHUB_ENV:-}" ]]; then
    {
        echo "VGW_VERSION=${VGW_VERSION}"
        echo "VGW_TAG=${TAG}"
        echo "VGW_SRC_DIR=${VGW_SRC_DIR}"
    } >> "${GITHUB_ENV}"
fi