#!/usr/bin/env bash
set -x
set -e

# Ensure the directory for LAST_DEPENDENCIES_HASH exists
mkdir -p /var/lib/zulip

SOURCES_FILE=/etc/apt/sources.list.d/zulip.list
STAMP_FILE=/etc/apt/sources.list.d/zulip.list.apt-update-in-progress

ZULIP_SCRIPTS="$(dirname "$(dirname "$0")")"
DEPENDENCIES_HASH=$(sha1sum "$ZULIP_SCRIPTS/setup/"*.asc "$0")
DEPENDENCIES_HASH_FILE="/var/lib/zulip/setup-repositories-state"
# Ensure that DEPENDENCIES_HASH_FILE exists before hashing it.
touch "$DEPENDENCIES_HASH_FILE"
LAST_DEPENDENCIES_HASH="$(cat "$DEPENDENCIES_HASH_FILE")"

# First, we only do anything in setup-apt-repo if any of its inputs
# (apt keys, code, etc.)  changed.
if [ "$DEPENDENCIES_HASH" = "$LAST_DEPENDENCIES_HASH" ]; then
    exit 0
fi

# Ensure that the sources file exists
touch "$SOURCES_FILE"

# Hash it to check if the sources file is changed by the script later.
zulip_source_hash=$(sha1sum "$SOURCES_FILE")

pre_setup_deps=(lsb-release apt-transport-https gnupg)
if ! apt-get -dy install "${pre_setup_deps[@]}"; then
    apt-get update
fi
apt-get -y install "${pre_setup_deps[@]}"

SCRIPTS_PATH="$(dirname "$(dirname "$0")")"

release=$(lsb_release -sc)
if [ "$release" = "trusty" ] || [ "$release" = "xenial" ] || [ "$release" = "bionic" ]; then
    apt-key add "$SCRIPTS_PATH"/setup/pgroonga-ppa.asc
    apt-key add "$SCRIPTS_PATH"/setup/zulip-ppa.asc
    cat >$SOURCES_FILE <<EOF
deb http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
deb http://ppa.launchpad.net/tabbott/zulip/ubuntu $release main
deb-src http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
deb-src http://ppa.launchpad.net/tabbott/zulip/ubuntu $release main
EOF
elif [ "$release" = "cosmic" ]; then
    # This case will eventually merge with the above, if/when we add
    # tsearch_extras packages to the Zulip PPA.
    apt-key add "$SCRIPTS_PATH"/setup/pgroonga-ppa.asc
    cat >$SOURCES_FILE <<EOF
deb http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
deb-src http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
EOF
elif [ "$release" = "stretch" ] || [ "$release" = "buster" ]; then
    apt-get install -y debian-archive-keyring
    apt-key add "$SCRIPTS_PATH"/setup/packagecloud.asc
    apt-key add "$SCRIPTS_PATH"/setup/pgroonga-debian.asc
    cat >$SOURCES_FILE <<EOF
deb https://packagecloud.io/zulip/server/debian/ $release main
deb https://packages.groonga.org/debian/ $release main
deb-src https://packages.groonga.org/debian/ $release main
EOF
else
    echo "Unsupported release $release."
    exit 1
fi

if [ "$zulip_source_hash" = "$(sha1sum "$SOURCES_FILE")" ] && ! [ -e "$STAMP_FILE" ]; then
    echo "zulip.list file did not change; skipping apt-get update"
else
    # We create this stamp file to ensure `apt-get update` will be run
    # the next time this script is invoked, and each time after, until
    # `apt-get update` finishes successfully.
    touch "$STAMP_FILE"
    apt-get update && rm -f "$STAMP_FILE"
fi

echo "$DEPENDENCIES_HASH" > "$DEPENDENCIES_HASH_FILE"