#!/bin/bash
# connect to iot services
THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
source "$THIS_DIR/../tools/common.sh"

# get target settings
# provides:
SERVER=""
PORT=""
SSH_USERNAME=""
SSH_OPTIONS=""
get_server_meta()
{
    local domain=${1##*.}
    local host=${1%.*}
    if [[ "$host" == "$domain" ]]; then
        domain=""
    fi
    case $domain in
        ibd )
            SERVER=$host.ibd.ink
            PORT=12022
            SSH_USERNAME=root
            ;;
        ob )
            SERVER=$host.ob.ac.cn
            PORT=24022
            SSH_USERNAME=root
            ;;
        nasp )
            SERVER=$host
            PORT=22
            SSH_USERNAME=dictxiong
            SSH_OPTIONS='-o ProxyJump="ssh@nasp.ob.ac.cn:36022"'
            ;;
        "" )
            SERVER=proxy.beardic.cn
            local tmp=$(sha256sum <<< "$host" | tr -cd "[:digit:]")
            tmp=${tmp:0:4}
            PORT=$((tmp+36000))
            SSH_USERNAME=root
            ;;
        * )
            fmt_fatal "unknown domain: $domain"
    esac
}

# ssh
_ssh()
{
    get_server_meta "$1"
    fmt_note "--> ssh to $SERVER:$PORT"
    eval ssh -p $PORT $SSH_OPTIONS $SSH_USERNAME@$SERVER
}

# main
print_help()
{
    fmt_info "usage: $0 <command> <service> [options]"
    echo "available commands: ssh"
}

router()
{
    test $# -eq 2 || (print_help && fmt_fatal "invalid arguments")
    case $1 in
        -h|--help)
            print_help
            ;;
        ssh )
            _ssh "$2"
            ;;
        * )
            print_help
            fmt_fatal "unknown command: $1"
            ;;
    esac
}

router "${GOT_OPTS[@]}"