#!/bin/sh

ACTION="$1"

set -eux

. .travis/cmake-freebsd-env.sh

travis_install() {
  . .travis/cmake-freebsd-install.sh

  git tag -l --sort=version:refname > GIT_TAGS

  OLD_PWD="$PWD"

  mkdir -p /opt/freebsd/cache
  cd /opt/freebsd/cache

  # === Get the VM image, set it up and cache ===

  # Create image if it's not cached or if this build script has changed
  sha256sum "$OLD_PWD/.travis/cmake-freebsd-env.sh"      > /tmp/sha
  sha256sum "$OLD_PWD/.travis/cmake-freebsd-install.sh" >> /tmp/sha
  sha256sum "$OLD_PWD/.travis/cmake-freebsd-stage1"     >> /tmp/sha
  if [ ! -f "./$IMAGE_NAME.tgz" ] || [ ! -f ./cmake-freebsd-stage1-all.sha256 ] || [ "`cat cmake-freebsd-stage1-all.sha256`" != "`cat /tmp/sha`" ]; then

    rm -rf ./*

    # https://download.freebsd.org/ftp/releases/VM-IMAGES/11.2-RELEASE/amd64/Latest/
    DL_SHA512="0c3c232c7023c5036daeb5fbf68c2ddecf9703c74e317afcf19da91e83d0afcc526785571e2868894ce15cdb56b74fafa1ce9fd216469db91e021ac2ef8911e5"
    # Selecting random mirror from https://www.freebsd.org/doc/handbook/mirrors-ftp.html
    # Note that not all mirrors listed on that page are working, so we have removed them
    # I'm so sorry, there are no arrays in sh and we are not using bash...
    DL_MIRROR_1=1
    DL_MIRROR_2=4
    # There are 2 mirrors
    DL_MIRROR_RANDOM=`expr $(date +%s) % 2 + 1`
    DL_URL="ftp://ftp$(eval echo \$DL_MIRROR_$DL_MIRROR_RANDOM).us.freebsd.org/pub/FreeBSD/releases/VM-IMAGES/${FREEBSD_VERSION}-RELEASE/amd64/Latest/${IMAGE_NAME}.xz"

    wget "$DL_URL"

    if ! ( echo "$DL_SHA512  $IMAGE_NAME.xz" | sha512sum -c --status - ) ; then
        echo "Error: sha512 of $IMAGE_NAME.xz doesn't match the known one"
        exit 1
    fi

    unxz "$IMAGE_NAME.xz"

    # With this we don't have to guess how long a command will run for and sleeping
    # for that amount of time, risking either under sleeping or over sleeping, instead
    # we will sleep exactly until the command is finished by printing out a unique
    # string after the command is executed and then checking if it was printed.
    execute_shell_and_wait()
    {
      # $RANDOM is a bash built-in, so we try to avoid name collision here by using ugly RANDOM_STR name
      RANDOM_STR=$(< /dev/urandom tr -dc _A-Za-z0-9 | head -c16)
      send_keys "$1;echo $RANDOM_STR

"
      # \[1B is a control escape sequence for a new line in the terminal.
      # We want to wait for <new-line>$RANDOM_STR instead of just $RANDOM_STR because
      # $RANDOM_STR we have inputted with send_keys above would appear in the screenlog.0
      # file and we don't want to match our input, we want to match the echo's output.
      # The .\? optionally matches any character. Sometimes it happens that there is some
      # random character inserved between the new line control escape sequence and $RANDOM_STR.
      wait_for "\[1B.\?$RANDOM_STR"
    }

    start_vm

    # Login as root user
    send_keys 'root

'

    # Wait for the prompt
    wait_for "root@.*:~"

    # Configure network, ssh and start changing password
    execute_shell_and_wait 'echo "ifconfig_em0=DHCP"          >> /etc/rc.conf'
    execute_shell_and_wait 'echo "Port 22"                    >> /etc/ssh/sshd_config'
    execute_shell_and_wait 'echo "PermitRootLogin yes"        >> /etc/ssh/sshd_config'
    execute_shell_and_wait 'echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config'
    execute_shell_and_wait 'echo "PermitEmptyPasswords yes"   >> /etc/ssh/sshd_config'
    execute_shell_and_wait 'echo "sshd_enable=YES"            >> /etc/rc.conf'
    send_keys 'sh /etc/rc.d/netif restart && sh /etc/rc.d/sshd start && passwd
'

    # Wait for the password prompt
    wait_for "Changing local password for root"

    # Reset password to empty for the passwordless ssh to work
    send_keys '
'
    wait_for "New Password"
    send_keys '
'

    # Update system
    RUN env PAGER=cat env ASSUME_ALWAYS_YES=YES freebsd-update --not-running-from-cron fetch
    # It fails if there is nothing to install, so we make it always succeed with true
    RUN env PAGER=cat env ASSUME_ALWAYS_YES=YES freebsd-update --not-running-from-cron install || true

    # Update packages
    RUN env PAGER=cat env ASSUME_ALWAYS_YES=YES pkg upgrade

    # Install and set bash as the default shell for the root user
    RUN env PAGER=cat env ASSUME_ALWAYS_YES=YES pkg install bash
    RUN chsh -s /usr/local/bin/bash root

    # Install required toxcore dependencies
    RUN PAGER=cat ASSUME_ALWAYS_YES=YES pkg install git \
                                                    opus \
                                                    libconfig \
                                                    libvpx \
                                                    libsodium \
                                                    gmake \
                                                    cmake \
                                                    pkgconf \
                                                    opencv \
                                                    portaudio \
                                                    libsndfile \
                                                    texinfo \
                                                    autotools

    # === Cache the VM image ===

    stop_vm

    # Create cache
    tar -Sczvf "$IMAGE_NAME.tgz" "$IMAGE_NAME"
    rm "$IMAGE_NAME"
    rm screenlog.0

    cp "$OLD_PWD/GIT_TAGS" .
    sha256sum "$OLD_PWD/.travis/cmake-freebsd-env.sh"      > cmake-freebsd-stage1-all.sha256
    sha256sum "$OLD_PWD/.travis/cmake-freebsd-install.sh" >> cmake-freebsd-stage1-all.sha256
    sha256sum "$OLD_PWD/.travis/cmake-freebsd-stage1"     >> cmake-freebsd-stage1-all.sha256

    ls -lh
  fi

  # === Update the image on new version (tag) of toxcore ===

  if ! diff -u ./GIT_TAGS "$OLD_PWD/GIT_TAGS" ; then
    # Extract the cached image
    tar -Sxzvf "$IMAGE_NAME.tgz"

    start_vm

    # Log in.
    # Although qemu prints "login:" and "Password:" lines, they are not written into the screen's log
    # file for some reason (perhaps not enough text to flush the buffer to a file?), so we can't use
    # wait_for on them, we just use sleep to add hopefully enough delay.
    sleep 5
    # "login:"
    send_keys 'root

'
    sleep 5
    # "Password:"
    send_keys '

'
    # Wait for the prompt
    wait_for "root@.* ~"

    # Update system
    RUN PAGER=cat ASSUME_ALWAYS_YES=YES freebsd-update --not-running-from-cron fetch
    RUN PAGER=cat ASSUME_ALWAYS_YES=YES freebsd-update --not-running-from-cron install || true

    # Update packages
    RUN PAGER=cat ASSUME_ALWAYS_YES=YES pkg upgrade

    # === Cache the updated VM image ===

    stop_vm

    # Create/Update cache
    rm "$IMAGE_NAME.tgz"
    tar -Sczvf "$IMAGE_NAME.tgz" "$IMAGE_NAME"
    rm "$IMAGE_NAME"
    rm screenlog.0

    cp "$OLD_PWD/GIT_TAGS" .

    ls -lh
  fi

  cd "$OLD_PWD"
}

travis_script() {
  echo "Nothing to do here. Building happens in stage 2."
}

if [ "-z" "$ACTION" ]; then
  "travis_script"
else
  "travis_$ACTION"
fi