#!/usr/bin/env bash
#
# Create a local branch for an issue. Branch name: issue/<number> (safe, short).
# Base branch defaults to "test"; ensure it is up to date (fetch + reset to origin/base).
# Usage: ./create-branch-for-issue.sh <issue_number> [base_branch]
#
set -euo pipefail

GITEA_ISSUES_DIR="${GITEA_ISSUES_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)}"
# shellcheck source=lib.sh
source "${GITEA_ISSUES_DIR}/lib.sh"

if [[ $# -lt 1 ]]; then
	log_err "Usage: $0 <issue_number> [base_branch]"
	exit 1
fi

ISSUE_NUM="$1"
BASE="${2:-test}"

require_git_root || exit 1

if git show-ref --quiet "refs/heads/issue/${ISSUE_NUM}"; then
	log_info "Branch issue/${ISSUE_NUM} already exists. Checking it out."
	git checkout "issue/${ISSUE_NUM}"
	echo "issue/${ISSUE_NUM}"
	exit 0
fi

if ! git show-ref --quiet "refs/heads/${BASE}"; then
	log_err "Base branch ${BASE} does not exist locally."
	exit 1
fi

git fetch origin
if git show-ref --quiet "refs/remotes/origin/${BASE}"; then
	git checkout "${BASE}"
	git reset --hard "origin/${BASE}"
else
	git checkout "${BASE}"
fi

git checkout -b "issue/${ISSUE_NUM}"
log_info "Created and checked out branch issue/${ISSUE_NUM} from ${BASE}."
echo "issue/${ISSUE_NUM}"