#!/bin/bash

#
# Script to completely delete an organization with all its repos on a Gitea instance.
#
# Heavily inspired by:
#   https://github.com/juergenhoetzel/github2gitea-mirror
# 

# ENVs:
#   ACCESS_TOKEN = Gitea token
#   GITERA_URL   = Gitea URL

# Displays the given input including "=> " on the console.
log () {
	echo "=> $1"
}

CURL="curl -f -S -s"

# Check for correctly set ENVs
# ACCESS_TOKEN and GITEA_URL are always necessary
if [[ -z "${ACCESS_TOKEN}" || -z "${GITEA_URL}" ]]; then
    echo -e "Please set the Gitea access token and URL in environment:\nexport ACCESS_TOKEN=abc\nexport GITEA_URL=http://gitea:3000\n" >&2
    echo -e "Don't use a trailing slash in URL!"
    exit 1
fi

# Parse input arguments
if [[ -z "$1" ]]; then
	log "No parameter(s) given. Exit."
    exit 1
fi
while [[ "$#" -gt 0 ]]; do
	case $1 in
		-o|--org) gitea_organization="$2"; shift ;;
		*) log "Unknown parameter passed: $1"; exit 1 ;;
	esac
	shift
done

# Prints a message on how to use the script with exit 1
fail_print_usage () {
    echo -e "Usage: $0"
    echo -e "   -o, --org \$organization             GitHub organization to mirror and/or the target organization in Gitea."
    echo "" >&2
    exit 1;
}

if [[ -z "${gitea_organization}" ]]; then
    echo -e "Organization not set."
    fail_print_usage
fi

# TODO:
#set -euo pipefail
set -eu pipefail

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 -rf ${jsonoutput}" EXIT

# Fetches all public/private repos of the given Gitea organization to '1.json'
fetch_orga_repos() {
    log "Fetch organization repos."
    if ! $CURL -X GET $GITEA_URL/api/v1/orgs/${gitea_organization}/repos "${header_options[@]}" >${jsonoutput}/1.json 2>${jsonoutput}/stderr.txt; then
        local code=$(<${jsonoutput}/result.txt)
        if (( code != 404 ));then # 404 == orga not found
            cat ${jsonoutput}/stderr.txt >&2
        fi
    fi
}

delete_orga_repos() {
    log "Delete orga repos."
    for f in ${jsonoutput}/1.json; do
        n=$(jq '. | length'<$f)
        if [[ "${n}" -gt "0" ]]; then
            (( n-- )) # last element
        else
            break;
        fi
        echo "Deleting $n repos."
        for i in $(seq 0 $n); do
            del_user=$(jq -r ".[$i] | .owner.username" <$f)
            del_repo=$(jq -r ".[$i] | .name " <$f)
            echo "Deleting repo: $del_user/$del_repo"
            $CURL -X DELETE $GITEA_URL/api/v1/repos/${del_user}/${del_repo} "${header_options[@]}" > ${jsonoutput}/result.txt 2>${jsonoutput}/stderr.txt
        done
    done
}

delete_orga() {
    log "Delete orga."
    if ! $CURL -X DELETE $GITEA_URL/api/v1/orgs/${gitea_organization} "${header_options[@]}" > ${jsonoutput}/result.txt 2>${jsonoutput}/stderr.txt; then
        local code=$(<${jsonoutput}/result.txt)
        if (( code != 404 ));then # 404 == orga not found
            cat ${jsonoutput}/stderr.txt >&2
        fi
    fi
}

# Actual run the script
fetch_orga_repos
delete_orga_repos
delete_orga

log "Finished."