#!/bin/bash

toolName=synapse
toolDeps="build-essential python3-dev libffi-dev python3-pip python3-setuptools postgresql libssl-dev virtualenv libjpeg-dev libxslt1-dev libpq5"
toolDir="/opt/synapse"
toolConfig="${toolDir}/homeserver.yaml"
toolUser="synapse"
toolGroup="synapse"

# Needed for different steps
postgresDb=""
postgresUser=""
postgresPass=""

# Get script working directory
# (when called from a different directory)
WDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >>/dev/null 2>&1 && pwd )"
CONFIG=0
#CONFIG_FILE_NAME="${toolName}.cfg"
#CONFIG_FILE_TEMPLATE="$WDIR/${CONFIG_FILE_NAME}.example"

#step_config() {
  ## e.g. to source a config file manually:
  #. "$CONFIG_FILE"
  ## or to use sequencer api:
  #initSeqConfig "$CONFIG_FILE_NAME" "$CONFIG_FILE_TEMPLATE"
  #if [ $? -eq 0 ] ; then
  #  CONFIG=1
  #fi
#}

step_1_info() { echo "Installing $toolName dependencies"; }
step_1_alias() { ALIAS="install"; }
step_1() {
  local aptOption=

  exe apt update
  endReturn -o $? "Updating apt repositories failed"

  if [ $QUIET -ne 0 ] ; then
    aptOption="-y"
  else
    aptOption=""
  fi

  exe apt install $toolDeps $aptOption
}

step_2_info() { echo "Create postgres database for $toolName"; }
step_2_alias() { ALIAS="createdb"; }
step_2() {
  readDatabaseInfos
 
  exe cd ~postgres 
  exe sudo -u postgres psql -c "CREATE USER ${postgresUser} WITH ENCRYPTED password '${postgresPass}';"
  exe sudo -u postgres psql -c "CREATE DATABASE ${postgresDb} ENCODING "UTF8" LC_COLLATE='C' LC_CTYPE='C' template=template0 OWNER ${postgresUser};"
  exe sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE \"${postgresDb}\" to ${postgresUser};"
}

step_3_info() { echo "Install $toolName"; }
step_3() {
  exe mkdir -p "$toolDir"
  exe virtualenv -p python3 "${toolDir}/env"
  exe cd "$toolDir"
  exe source "${toolDir}/env/bin/activate"
  exe pip install --upgrade pip
  exe pip install --upgrade setuptools
  exe pip install matrix-synapse[postgres]
  
  # Create default configuration
  exe python3 -m synapse.app.homeserver --server-name matrix.mydomain.com --config-path homeserver.yaml --generate-config --report-stats=no
  exe deactivate

  # Create media directories
  exe mkdir ${toolDir}/media_store ${toolDir}/uploads
  exe chmod 770 "${toolDir}/media_store" "${toolDir}/uploads"
  # Allow matrix to write its logs in /opt/synapse
  exe chmod 755 "${toolDir}"
  exe chown ${toolUser}:${toolGroup} "${toolDir}" "${toolDir}/media_store" "${toolDir}/uploads"
}

step_4_info() { echo "Configure $toolName"; }
step_4() {
  exe vi "$toolConfig"
}

step_5_info() { echo "Create $toolName systemd service"; }
step_5() {
  exe addgroup "$toolGroup"
  exe adduser --system --home ${toolDir}/ --no-create-home --disabled-password --shell /bin/nologin --ingroup "$toolGroup" "$toolUser"
  addConf -c "$toolService" "$toolServiceLoc"
}
toolServiceLoc="/etc/systemd/system/system/matrix-synapse.service"
toolService="[Unit]
Description=Matrix Synapse service
After=network.target

[Service]
Type=forking
WorkingDirectory=${toolDir}/
ExecStart=${toolDir}/env/bin/synctl start
ExecStop=${toolDir}/env/bin/synctl stop
ExecReload=${toolDir}/env/bin/synctl restart
User=${toolUser}
Group=${toolGroup}
Restart=always
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=synapse

[Install]
WantedBy=multi-user.target"

step_20_info() { echo "Backup postgres database"; }
step_20_alias() { ALIAS="backupdb"; }
step_20() {
  local DELYEAR=$(($(date +%Y)-2))
  if [ ! -s ~/.pgpass ] ; then
    echo " [I] For unattended backup please define ~/.pgpass containing credentials"
    echo "     e.g. localhost:5432:database:user:pass"
    echo "Backup custom pg format with standard user / database: synapse / synapse"
  fi
  exep "pg_dump -h 127.0.0.1 -U synapse -Fc synapse | bzip2 -c > ${toolDbBackupFolder}/`date +%Y-%m-%d\"_\"%H-%M-%S`.backup.bz2"
  exe rm -f ${toolDbBackupFolder}/${DELYEAR}*
}
toolDbBackupFolder=/root/backupdb


step_22_info() { echo "Postgres database restore"; }
step_22_alias() { ALIAS="restoredb"; }
step_22() {
  echo " [I] Postgres database restore procedure"
  echo "1. Create a empty postgres database first (step 4)"
  echo "2. psql -h <host> -U <database user> -d <database name> -W -f <sql dump file>"
  echo "   e.g.  psql -h 127.0.0.1 -U synapse -d synapse -W -f 2018-06-07_18-10-56.sql"
  echo "or"
  echo "3. Custom postgres format dump restore:"
  echo "   pg_restore -h localhost -p 5432 -U synapse -d new_db -v \"10.70.0.61.backup\""
  echo
  echo "Available postgresql databases:"
  exe cd ~postgres && sudo -u postgres psql -c '\l'
  echo "Available postgresql user:"
  exe cd ~postgres && sudo -u postgres psql -c '\du'
}

# Read postgres database information dbname/user/pass if empty
readDatabaseInfos() {
  if [ "$postgresDb" == "" ] ; then
    read -p "Enter postgres database name: " postgresDb
    endCheckEmpty postgresDb "database"
  fi
  if [ "$postgresUser" == "" ] ; then
    read -p "Enter postgres user name: " postgresUser
    endCheckEmpty postgresUser "user name"
  fi
  if [ "$postgresPass" == "" ] ; then
    read -s -p "Enter postgres password: " postgresPass
    endCheckEmpty postgresPass "password"
  fi
  echo
}

# Needs readDatabaseInfos() to execute some commands
toolScript() {
  if [ ! -z "$1" ] ; then
    readDatabaseInfos
  fi
}

VERSION_SEQREV=11
. /usr/local/bin/sequencer.sh