#!/usr/bin/env bash
set -euo pipefail

if [[ -n "${OWNER:-}" ]]; then
	printf '%s\n' "${OWNER,,}"
	exit 0
fi

if [[ -n "${GITHUB_REPOSITORY_OWNER:-}" ]]; then
	printf '%s\n' "${GITHUB_REPOSITORY_OWNER,,}"
	exit 0
fi

if [[ -n "${GITHUB_REPOSITORY:-}" ]]; then
	owner="${GITHUB_REPOSITORY%%/*}"
	printf '%s\n' "${owner,,}"
	exit 0
fi

if remote_url="$(git config --get remote.origin.url 2>/dev/null)" && [[ -n "${remote_url}" ]]; then
	remote_path="${remote_url%.git}"

	if [[ "${remote_path}" == *://* ]]; then
		remote_path="${remote_path#*://}"
		remote_path="${remote_path#*@}"
		remote_path="${remote_path#*/}"
	elif [[ "${remote_path}" == *:* ]]; then
		remote_path="${remote_path#*:}"
	fi

	if [[ "${remote_path}" == */* ]]; then
		owner="${remote_path%%/*}"
		printf '%s\n' "${owner,,}"
		exit 0
	fi
fi

echo "ERROR: Could not resolve repository owner from OWNER, GITHUB_REPOSITORY_OWNER, GITHUB_REPOSITORY or git remote." >&2
exit 1