#!/bin/bash
# Backup Gitea database in a Kubernetes environment
# Usage: backup-database [OPTIONS] <destination>

# `gitea dump` is a mess that we should not touch. We write our own backup scripts instead.
#
usage() {
    >&2 printf "Usage: %s <destination>\n" "${0}"
    >&2 printf "Options:\n"
    >&2 printf "\t-e \t Specify the environment file to use\n"
    exit "${1:-1}"
}

# Get options

while getopts ":e:" option; do
    case "${option}" in
        e)
            if ! [ -f "${OPTARG}" ]; then
                >&2 printf "Error: Specified environment file does not exist: '%s'.\n" "${OPTARG}"
            elif ! [ -r "${OPTARG}" ]; then
                >&2 printf "Error: Specified environment file is not readable: '%s'.\n" "${OPTARG}"
            fi
            env_file="${OPTARG}"
            ;;
        *)
            >&2 printf "Error: Invalid option: '%s'.\n" "${option}"
            usage
            ;;
    esac
done
shift $(( OPTIND - 1 ))

# Check arguments.

if [ $# -ne 1 ]; then
    >&2 printf "Error: You need to specify a destination.\n"
    usage
elif ! [ -d "${1}" ]; then
    >&2 printf "Error: Specified destination does not exist or is not readable : '%s'.\n" "${1}"
    usage
else
    destination="${1}"
fi

# Retrieve container names
base_container="$( docker ps --format '{{.Names}}' | grep -E 'gitea_gitea-[0-9a-z]{10}-[0-9a-z]{5}' )"
database_container="$( docker ps --format '{{.Names}}' | grep 'postgres_gitea-cnpg-main-1' )"

if ! [[ -n "${base_container}" && -n "${database_container}" ]]; then
    >&2 printf "Error: Not all containers could be found.\n"
    exit 2
fi

# Abort entire script if any command fails
set -e

# Enable maintenance mode
# Flush queues
docker exec "${base_container}" gitea manager flush-queues
# TODO Pause queues

# Database backup

# Filename for database backup. 
database_backupfile="gitea-sqlbkp_$( date +'%Y%m%d' ).bak"
host_database_backupfile="${destination}/${database_backupfile}"

# Backup the database
>&2 echo 'Backing up database'
docker exec --env-file "${env_file:=.env}" "${database_container}" pg_dump 'gitea' -cwv -h 'localhost' -U 'gitea' > "${host_database_backupfile}"

# Disable maintenance mode
# TODO Continue queues

# Double check
# gitea doctor --all --log-file /tmp/doctor.log
# TODO

printf "Done.\n"