#!/bin/sh

# https://gist.github.com/gregdel/870d58c80b80172445dc93294531d88c
#
# brew install jq
#
set -e

_usage() {
	echo "Usage: $0 [--user|org] USER_OR_ORG_NAME GITEA_REPO_NAME GITLAB_HTTPS_URL"
	exit 0
}

MODE=$1
GITEA_USERNAME=$2
GITEA_REPO_NAME=$3
GITLAB_CLONE_URL=$4

case $MODE in
	--user|--org);;
	*) _usage    ;;
esac
[ -z "$GITLAB_CLONE_URL" ] && _usage
[ -z "$GITEA_REPO_NAME" ] && _usage
[ -z "$GITEA_USERNAME" ] && _usage

echo "Migrating $GITLAB_CLONE_URL to $GITEA_USERNAME/$GITEA_REPO_NAME"

GITEA_URL=${GITEA_URL:-"http://GITEA_URL"}
GITEA_TOKEN=${GITEA_TOKEN:-"YOUR_GITEA_TOKEN"}

GITLAB_USERNAME=${GITLAB_USERNAME:-"m"}
GITLAB_TOKEN=${GITLAB_TOKEN:-"YOUR_GITLAB_TOKEN"}

_api_call() {
	# shellcheck disable=SC2086
	curl -s -L -H "Authorization: token $GITEA_TOKEN" \
		-H "Accept: application/json" \
		-H "Content-Type:application/json" \
		"$GITEA_URL/api/v1/"$*
}

GITEA_UID=
[ "$MODE" = "--user" ] && GITEA_UID=$(_api_call "users/$GITEA_USERNAME" | jq .id)
[ "$MODE" = "--org" ] && GITEA_UID=$(_api_call "orgs/$GITEA_USERNAME" | jq .id)

echo "$GITEA_USERNAME has the user id $GITEA_UID"

migration_data=$(jq -n -c \
	--arg name "$GITEA_REPO_NAME" \
	--arg uid "$GITEA_UID" \
	--arg clone_url "$GITLAB_CLONE_URL" \
	--arg auth_username "$GITLAB_USERNAME" \
	--arg auth_password "$GITLAB_TOKEN" \
	'{
		repo_name: $name,
		clone_addr: $clone_url,
		auth_username: $auth_username,
		auth_password: $auth_password,
		uid: $uid | tonumber,
		private: true,
	}'
)
_api_call repos/migrate --data "$migration_data" | jq .