#!/bin/bash
set -euo pipefail

GIT_URLS_MODE='--git-urls'
MODES=("${GIT_URLS_MODE}")

function usage {
	echo "Usage: $0 [$(printf " | %s" "${MODES[@]}" | sed 's,^ | ,,')] [--instance URL] [USER_OR_GROUP_NAME...]" >&2
	echo "The instance URL defaults to https://gitlab.com/" >&2
	exit 1
}

mode=''
if [[ $# -ge 1 && " ${MODES[@]} " =~ " ${1} " ]]
then
	mode="$1"
	shift
fi

instance=https://gitlab.com/
if [[ $# -ge 2 && "$1" == '--instance' ]]
then
	instance="$2"
	shift
	shift
	if [[ "${instance}" != */ ]]
	then
		instance="${instance}/"
	fi
fi

if [[ $# -ge 1 && "$1" == --* ]]; then usage; fi

if [[ $# -eq 0 ]]
then
	target=instance
	set ''
else
	target=user-or-group
fi

scriptpath="$(cd "$(dirname "$0")"; pwd -P)"

for name
do
	if [[ "${target}" == instance ]]
	then
		url="${instance}api/v4/projects?per_page=100"
	else
		page="$("${scriptpath}/curl-ua" firefox -s "${instance}${name}")"
		if grep -q -F '<a data-target="div#activity" data-action="activity" data-toggle="tab" href="' <<<"${page}"
		then
			echo "${name}: User" >&2
			url="${instance}api/v4/users/${name}/projects?per_page=100"
		elif grep -q -F 'data-page="groups:show"' <<<"${page}"
		then
			echo "${name}: Group" >&2
			url="${instance}api/v4/groups/${name}/projects?per_page=100&include_subgroups=true"
		else
			echo "Error: unknown page type for ${name}" >&2
			exit 1
		fi
	fi

	{
		pipe=$(mktemp -u); mkfifo "${pipe}"; exec 3<>"${pipe}"; rm "${pipe}"; unset pipe  # For the disgusting HTTP header treatment
		"${scriptpath}/curl-ua" firefox -s --fail -D >({ grep -i -m 1 '^x-total-pages: ' || echo 'x-total-pages: 1'; } | sed 's,^.*: ,,' | tr -d '\r' >&3) "${url}"
		declare -i nPages=$(head -1 <&3)
		if [[ ${nPages} -ge 2 ]]
		then
			for ((page=2; page<=${nPages}; ++page))
			do
				echo -n $'\r'"Requesting page ${page} of ${nPages}" >&2
				"${scriptpath}/curl-ua" firefox -s --fail "${url}&page=${page}"
			done
			echo >&2
		fi
	}
done | \
  grep -Po '"path_with_namespace":\s*"\K[^"]+' | \
  awk -v instance="${instance}" '{ print instance $0; }' | \
  {
	if [[ -z "${mode}" ]]
	then
		cat
	elif [[ "${mode}" == "${GIT_URLS_MODE}" ]]
	then
		awk '{ print $0 ".git"; print $0 ".wiki.git"; }'
	fi
  }