#!/bin/bash

set -euo pipefail

# Mirror starred Github repos to a Gitea Organization
CURL="curl -f -S -s"

if [[ -z "${ACCESS_TOKEN}" || -z "${GITEA_URL}" ]];then
    echo -e "Please set gitea access token and url in environment:\nexport ACCESS_TOKEN=abc\nexport GITEA_URL=http://gitea:3000\n" >&2
    echo -e "Don't use trailing slash in URL!"
    exit 1
fi

github_user="${1:-}"
gitea_organization="${2:-}"

if [[ -z "${github_user}" || -z "${gitea_organization}" ]]; then
    echo "Usage: $0 github_user gitea_organization" >&2
    exit 1
fi

header_options=(-H  "Authorization: Bearer ${ACCESS_TOKEN}" -H "accept: application/json" -H "Content-Type: application/json")
jsonoutput=$(mktemp -d -t github-repos-XXXXXXXX)
trap "rm -rvf ${jsonoutput}" EXIT

uid=$($CURL "${header_options[@]}" $GITEA_URL/api/v1/orgs/${gitea_organization} |jq .id)

fetch_starred_repos(){
    i=1
    # Github API just returns empty arrays instead of 404
    while $CURL "https://api.github.com/users/${github_user}/starred?page=${i}&per_page=100" >${jsonoutput}/${i}.json \
	    && (( $(jq <${jsonoutput}/${i}.json '.|length') > 0 )) ; do
	(( i++ ))
    done
}

create_migration_repo() {
    if ! $CURL -w  "%{http_code}\n"  "${header_options[@]}" -d @- -X POST $GITEA_URL/api/v1/repos/migrate > ${jsonoutput}/result.txt 2>${jsonoutput}/stderr.txt;then
	local code=$(<${jsonoutput}/result.txt)
	if (( code != 409 ));then # 409 == repo already exits
	    cat ${jsonoutput}/stderr.txt >&2
	fi
    fi
}

repos_to_migration() {
    for f in ${jsonoutput}/*.json; do
	n=$(jq '.|length'<$f)
	(( n-- ))		# last element
	for i in $(seq 0 $n); do
	    jq ".[$i]|.uid=${uid}|.mirror=true|.clone_addr=.clone_url|.repo_name=.name|{uid,repo_name,clone_addr,description}" <$f \
		| create_migration_repo
	done
    done
}

fetch_starred_repos
repos_to_migration