#!/bin/bash

usage () {
  echo "Usage: launcher COMMAND [--skip-prereqs] [--docker-args STRING]"
  echo "Commands:"
  echo "    start:      Start/initialize the container"
  echo "    stop:       Stop a running container"
  echo "    restart:    Restart the container"
  echo "    destroy:    Stop and remove the container"
  echo "    enter:      Open a shell to run commands inside the container"
  echo "    logs:       View the Docker container logs"
  echo "    bootstrap:  Bootstrap the container based on a template"
  echo "    rebuild:    Rebuild the container (destroy old, bootstrap, start new)"
  echo
  echo "Options:"
  echo "    --skip-prereqs             Don't check launcher prerequisites"
  echo "    --docker-args              Extra arguments to pass when running docker"
  exit 1
}

set -e
set -o pipefail

version=6.0.7
image=seafileltd/seafile:$version
local_image=local_seafile/server:latest
dockerdir=$(cd "$(dirname $0)"; pwd -P)
sharedir=$dockerdir/shared
installdir=/opt/seafile/seafile-server-$version
bootstrap_conf=$dockerdir/bootstrap/bootstrap.conf
version_stamp_file=$sharedir/seafile/seafile-data/current_version

cd $dockerdir

logdbg() {
    if [[ $verbose == "true" ]]; then
        loginfo "[debug] $1"
    fi
}

loginfo() {
    if [[ -t 1 ]]; then
        >&2 printf "[$(date +'%Y-%m-%d %H:%M:%S')] \033[32m%s\033[m\n" "$1"
    else
        >&2 echo "[$(date +'%Y-%m-%d %H:%M:%S')] " "$1"
    fi
}

install_docker() {
  echo "---------------------------------------------------------------------------------"
  echo "Docker is not installed, you will need to install Docker in order to run Launcher"
  echo "See https://docs.docker.com/installation/"
  echo "---------------------------------------------------------------------------------"
  exit 1
}

err_and_quit () {
    if [[ -t 1 ]]; then
        >&2 printf "\n\n\033[33mError: %s\033[m\n\n" "$1"
    else
        >&2 echo "$1"
    fi
    exit 1
}

init_shared() {
    mkdir -p $sharedir/{seafile,db}
    mkdir -p $sharedir/logs/{seafile,var-log}

    mkdir -p $sharedir/logs/var-log/nginx
    touch $sharedir/logs/var-log/syslog

    local bash_history=$sharedir/.bash_history
    if [[ ! -e $bash_history ]]; then
        touch $bash_history
    fi
}

set_envs() {
    envs=""
    if [[ $verbose == "true" ]]; then
        envs="$envs -e SEAFILE_DOCKER_VERBOSE=true"
    fi
}

set_ports() {
    ports=$(docker run $user_args --rm -it \
                   -v ${dockerdir}/scripts:/scripts \
                   -v ${dockerdir}/bootstrap:/bootstrap:ro \
                   $image \
                   /scripts/bootstrap.py --parse-ports)
}

set_bootstrap_volumes() {
    local mounts
    init_shared

    mounts=(
        $sharedir:/shared
        $sharedir/logs/var-log:/var/log
        $sharedir/db:/var/lib/mysql
        $dockerdir/bootstrap:/bootstrap
        $dockerdir/scripts:/scripts:ro
        $dockerdir/templates:/templates:ro
        $dockerdir/scripts/tmp/check_init_admin.py:$installdir/check_init_admin.py:ro
        $sharedir/.bash_history:/root/.bash_history
    )
    volumes=""
    local m
    for m in ${mounts[*]}; do
        volumes="$volumes -v $m"
    done
}

set_volumes() {
    local mounts
    init_shared

    mounts=(
        $sharedir:/shared
        $sharedir/logs/var-log:/var/log
        $sharedir/db:/var/lib/mysql
        $sharedir/.bash_history:/root/.bash_history
    )
    volumes=""
    local m
    for m in ${mounts[*]}; do
        volumes="$volumes -v $m"
    done
}

set_existing_container() {
  existing=$(docker ps -a | awk '{ print $1, $(NF) }' | grep " seafile$" | awk '{ print $1 }' || true)
}

bootstrap() {
    if [[ ! -e $bootstrap_conf  ]]; then
        err_and_quit "The file $bootstrap_conf doesn't exist. Have you run seafile-server-setup?"
    fi

    docker history $image >/dev/null 2>&1 || {
        loginfo "Pulling Seafile server image $version, this may take a while."
        docker pull $image
        loginfo "Seafile server image $version pulled. Now bootstrapping the server ..."
    }

    # First initialize seafile server and letsencrypt
    set_envs
    set_bootstrap_volumes
    set_ports

    docker run $user_args --rm -it --name seafile-bootstrap -e SEAFILE_BOOTSRAP=1 $envs $volumes $ports $image /sbin/my_init $quiet -- /scripts/bootstrap.py

    loginfo "Now building the local docker image."
    docker build -f bootstrap/generated/Dockerfile -t local_seafile/server:latest  . >/dev/null
    loginfo "Image built."
}

start() {
    existing=$(docker ps | awk '{ print $1, $(NF) }' | grep " seafile$" | awk '{ print $1 }' || true)
    if [[ $existing != "" ]]; then
        loginfo "Nothing to do, your container has already started!"
        exit 0
    fi

    check_version_match

    chmod 0700 $dockerdir/bootstrap $sharedir/seafile/conf

    set_existing_container
    if [[ $existing != "" ]]; then
        loginfo "starting up existing container"
        (
            set -x
            docker start seafile
        )
        exit 0
    fi

    set_envs
    set_volumes
    set_ports

    local restart_policy attach_on_run
    if [[ "${SUPERVISED}" = "true" ]]; then
        restart_policy="--restart=no"
        attach_on_run="-a stdout -a stderr"
    else
        attach_on_run="-d"
    fi

    loginfo "Starting up new seafile server container"
    (
        set -x
        docker run $user_args $attach_on_run $restart_policy --name seafile -h seafile $envs $volumes $ports $local_image
    )
}

ensure_container_running() {
    set_existing_container
    if [[ $existing == "" ]]; then
        err_and_quit "seafile was not started !"
    fi
}

stop() {
    ensure_container_running
    (
        set -x
        docker stop -t 10 seafile
    )
}

enter() {
    ensure_container_running
    (
        set -x
        docker exec -it seafile /bin/bash
    )
}

restart() {
    stop
    start
}

check_prereqs() {
    if [[ $SKIP_PREREQS == "true" ]]; then
        return 0
    fi

    # check docker
    if ! which docker >/dev/null; then
        install_docker
    fi
    # TODO: check git version
}

logs() {
    ensure_container_running
    (
        set -x
        docker logs --tail=20 -f seafile
    )
}

destroy() {
    (
        set -x
        docker stop -t 10 seafile || true
        docker rm seafile
    )
}

get_major_version() {
    echo $1| awk -F . '{printf "%s.%s", $1, $2}'
}

check_version_match() {
    local last_version last_major_version current_major_version
    last_version=$(cat $version_stamp_file)
    last_major_version=$(get_major_version $last_version)
    current_major_version=$(get_major_version $version)

    logdbg "Your version: ${last_version}, latest version: ${version}"

    if [[ $last_major_version != "$current_major_version" ]]; then
        loginfo "******* Major upgrade detected *******"
        loginfo "You have $last_version, latest is $version"
        loginfo "Please run './launcher rebuild' to upgrade"
        exit 1
    fi
}

check_upgrade() {
    loginfo "Checking if there is major version upgrade"

    local last_version last_major_version current_major_version
    last_version=$(cat $version_stamp_file)
    last_major_version=$(get_major_version $last_version)
    current_major_version=$(get_major_version $version)

    if [[ $last_major_version == "$current_major_version" ]]; then
        return
    else
        loginfo "********************************"
        loginfo "Major upgrade detected: You have $last_version, latest is $version"
        loginfo "********************************"

        # use_manual_upgrade=true
        if [[ $use_manual_upgrade == "true" ]]; then
            loginfo "Now you can run './launcher manual-upgrade' to do manual upgrade."
            exit 0
        else
            loginfo "Going to launch the docker container for manual upgrade"
            _launch_for_upgrade --auto
        fi
    fi
}

_launch_for_upgrade() {
    local cmd
    if [[ $1 == "--auto" ]]; then
        cmd="/scripts/upgrade.py"
    else
        cmd="/bin/bash"
    fi

    set_envs
    set_volumes
    (
        set -x
        docker run $user_args \
               -it --rm --name seafile-upgrade -h seafile \
               $envs $volumes $local_image \
               /sbin/my_init $quiet -- $cmd
    )
}

rebuild() {
    if [[ "$(git symbolic-ref --short HEAD)" == "master" ]]; then
        loginfo "Ensuring launcher is up to date"

        git remote update

        LOCAL=$(git rev-parse @)
        REMOTE=$(git rev-parse "@{u}")
        BASE=$(git merge-base @ "@{u}")

        if [[ $LOCAL = "$REMOTE" ]]; then
            loginfo "Launcher is up-to-date"

        elif [[ $LOCAL = "$BASE" ]]; then
            loginfo "Updating Launcher"
            git pull || (echo 'failed to update' && exit 1)

            for (( i=${#BASH_ARGV[@]}-1,j=0; i>=0,j<${#BASH_ARGV[@]}; i--,j++ ))
            do
                args[$j]=${BASH_ARGV[$i]}
            done
            exec /bin/bash $0 "${args[@]}" # $@ is empty, because of shift at the beginning. Use BASH_ARGV instead.

        elif [[ $REMOTE = "$BASE" ]]; then
            loginfo "Your version of Launcher is ahead of origin"
        else
            loginfo "Launcher has diverged source, this is only expected in Dev mode"
        fi

    fi

    set_existing_container

    if [[ $existing != "" ]]; then
        loginfo "Stopping old container"
        (
            set -x
            docker stop -t 10 seafile
        )
    fi

    bootstrap
    loginfo "Rebuilt successfully."

    if [[ $existing != "" ]]; then
        loginfo "Removing old container"
        (
            set -x
            docker rm seafile
        )
    fi

    check_upgrade

    start

    loginfo "Your seafile server is now running."
    exit 0
}

manual_upgrade() {
    _launch_for_upgrade
    loginfo "If you have manually upgraded the server, please update the version stamp by:"
    loginfo
    loginfo "       echo $version | sudo tee $version_stamp_file"
    loginfo "       sudo ./launcher start"
    loginfo
}

main() {
    local action
    while [[ $# -gt 0 ]]
    do
        case "$1" in
            bootstrap|start|stop|restart|enter|destroy|logs|rebuild|manual-upgrade)
                                                action=${1//-/_}            ; shift 1 ;;
            -h|--help)                          ( usage ; exit 1)           ; shift 1 ;;
            -v|--verbose)                       verbose=true                ; shift 1 ;;
            --skip-prereqs)                     SKIP_PREREQS=true           ; shift 1 ;;
            --docker-args)                      user_args=$2                ; shift 2 ;;
            --manual-upgrade)                   use_manual_upgrade=true     ; shift 1 ;;
            *)                                  err_and_quit "Argument error. Please see help." ;;
        esac
    done

    # By default we suppress the verbose logs like "Running
    # /etc/my_init.d/99_mysql_setup.sh". Use "./launcher -v <cmd>" to enable
    # printing of these verbose logs.
    quiet="--quiet"
    if [[ $verbose == "true" ]]; then
        quiet=""
    fi
    "$action"
}

check_prereqs
main "$@"