#!/usr/bin/env bash

set -eu
script_name=$0

die() {
    echo >&2 "$@"
    exit 1
}

MYSQL_HOST=${MYSQL_HOST:-127.0.0.1}
MYSQL_PORT=${MYSQL_PORT:-3306}
MYSQL_PASSWORD=${MYSQL_PASSWORD:-password}
MYSQL_USER=${MYSQL_USER:-root}

about() {
    die "usage: $script_name [ config_yaml | setup | dump <backup_file> | restore <backup_file> ]"
}

check_mysql_client() {
    if ! command -v mysql >/dev/null; then
        die "missing required program 'mysql' as a mysql client (package mariadb-client-core-10.6 on debian like system)"
    fi
}

exec_sql() {
    cmd="${1?Missing required sql command}"
    mysql -h "${MYSQL_HOST}" -u "${MYSQL_USER}" "--port=${MYSQL_PORT}" "-p${MYSQL_PASSWORD}" <<< "$cmd"
}

requirements() {
    check_mysql_client
}

setup() {
    exec_sql "DROP DATABASE IF EXISTS crowdsec_test;"
    exec_sql "CREATE DATABASE crowdsec_test;"
    exec_sql "DROP USER IF EXISTS crowdsec_test;"
    exec_sql "CREATE USER 'crowdsec_test' IDENTIFIED BY 'crowdsec_test';"
    exec_sql "GRANT ALL PRIVILEGES ON crowdsec_test.* TO 'crowdsec_test';"
}

dump() {
    backup_file="${1?Missing file to backup database to}"
    COLUMN_STATISTICS=
    if mysqldump --column-statistics 2>&1 | grep -v 'unknown option'; then
        COLUMN_STATISTICS='--column-statistics=0'
    fi
    mysqldump $COLUMN_STATISTICS "-h${MYSQL_HOST}" "-u${MYSQL_USER}" "-p${MYSQL_PASSWORD}" --databases crowdsec_test > "$backup_file"
}

restore() {
    backup_file="${1?missing file to restore database from}"
    [ -f "$backup_file" ] || die "Backup file $backup_file doesn't exist"
    mysql -h "${MYSQL_HOST}" -u "${MYSQL_USER}" "--port=${MYSQL_PORT}" "-p${MYSQL_PASSWORD}" < "$backup_file"
    exec_sql "CREATE USER IF NOT EXISTS 'crowdsec_test' IDENTIFIED BY 'crowdsec_test';"
    exec_sql "GRANT ALL PRIVILEGES ON crowdsec_test.* TO 'crowdsec_test';"
}

config_yaml() {
    MYSQL_PORT=${MYSQL_PORT} MYSQL_HOST=${MYSQL_HOST} yq '
        .db_config.type="mysql"|
        .db_config.user="crowdsec_test" |
        .db_config.password="crowdsec_test" |
        .db_config.db_name="crowdsec_test"  |
        .db_config.host=strenv(MYSQL_HOST) |
        .db_config.port=env(MYSQL_PORT) |
        del(.db_config.db_path)
    ' -i "${CONFIG_YAML}"
}

[ $# -lt 1 ] && about

case "$1" in
    setup)
        setup
        ;;
    config-yaml)
        config_yaml
        ;;
    dump)
        shift
        dump "$@"
        ;;
    restore)
        shift
        restore "$@"
        ;;
    *)
        about
        ;;
esac;