#!/bin/bash

# Start/stop/restart sickchill.

# Originally created for sickrage in 2016
# Updated to sickchill in 2023

# Copyright 2016-2026  Jeremy Hansen <jebrhansen+SBo@gmail.com>
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Set program name in case you want to run sick{beard|rage|gear|etc}
PROG=${PROG:-sickchill}

# If you want to have multiple instances of sickchill running, set
# the suffix here.
SUFFIX=

# Set this when running multiple sickchill instances. The suffix is used
# to distinguish each instance's configuration and data files.
if [ -n "$SUFFIX" ]; then
  FULLPROG="$PROG-$SUFFIX"
# Just use $PROG if there isn't a suffix set
else
  FULLPROG="$PROG"
fi

# Source SickRage configuration
if [ -f /etc/"$FULLPROG".conf ]; then
        . /etc/"$FULLPROG".conf
fi

# Ensure all required variables are set in conf file
# Edit conf file in /etc/$FULLPROG.conf for any changes
MISSING=0
for var in USERNAME DATADIR PIDFILE PORT; do
  if [ -z "${!var}" ]; then
    ((MISSING++))
    VAR="$var $VAR"
  fi
done
if [ $MISSING -gt 0 ]; then
  echo "/etc/$FULLPROG.conf is missing some or all required variables ($VAR)."
  echo "Please check the file and try again."
  exit 1
fi

# Check if the server is responding with a 200
get_status()
{
  local SERVER_STATUS
  SERVER_STATUS=$(curl -o /dev/null -s -w "%{http_code}" -L --max-time 5 http://localhost:"$PORT")
  if [ "$SERVER_STATUS" == "200" ]; then
    return 0
  else
    return 1
  fi
}

# Check if the program is running and pid file exists
check()
{
  # Ensure variables are reset
  STATUS=
  TYPE=
  PID=

  # First check if any sickchill instance is running. The PID file
  # and port checks below determine whether this instance is running.
  if pgrep "$PROG" > /dev/null; then

    # If it's running, check if the PID file exists
    if [ -e "$PIDFILE" ]; then
      PID=$(cat "$PIDFILE" 2> /dev/null)

      # Check that the PID in the file is a running process
      if [ -n "$PID" ] && kill -0 "$PID" 2>/dev/null; then
        # Now check that the PID is actually for the correct sickchill instance
        if grep -aq "$PROG.*--pidfile=$PIDFILE" "/proc/$PID/cmdline"; then
          # Finally see if the server responds correctly
          if get_status; then
            STATUS=running
          # Otherwise sickchill is running and the pid exists, but the server
          # isn't responding properly, so something is broken.
          else
            STATUS=broken
            TYPE=server
          fi
        # The PID belongs to a different process. This can happen if sickchill
        # was stopped and the PID was later reused by another process.
        else
          STATUS=broken
          TYPE=process
        fi
      # The PID in PIDFILE is not a running process anymore
      else
        STATUS=broken
        TYPE=pid-stale
      fi
    # Any running sickchill instances do not match the expected PID. Let's see
    # if one matches the expected port, which would mean it is running without
    # the expected pid file.
    else
      # Check if the program is running without the pid file matching
      if pgrep -f "$PROG.*--port=$PORT" > /dev/null; then
        STATUS=broken
        TYPE=pid-missing
      # If no running instance matches the expected port, then we can safely
      # assume this instance is not running.
      else
        STATUS=stopped
      fi
    fi
  # If a pid file exists without any sickchill running, it's broken
  else
    if [ -e "$PIDFILE" ]; then
      STATUS=broken
      TYPE=pid-stale
    else
      STATUS=stopped
    fi
  fi

}

broken()
{

    if [ "$TYPE" == "pid-stale" ]; then
      echo "ERROR: $FULLPROG has a stale PID file."
      echo "The PID file exists, but the process it references is not running:"
      echo "  - $PIDFILE"
      echo "The stale PID file can be safely removed."
      echo "Try: $0 force-start"
    elif [ "$TYPE" == "pid-missing" ]; then
      echo "ERROR: $FULLPROG is running without its expected PID file."
      echo "The $FULLPROG process appears to be running, but:"
      echo "  - $PIDFILE"
      echo "was not found."
      echo "Did you start $FULLPROG without using $0?"
      echo "Do not start another instance until the existing process is stopped."
    elif [ "$TYPE" == "process" ]; then
      echo "ERROR: $PIDFILE points to a different process."
      echo "The PID stored in the PID file belongs to a process other than $FULLPROG."
      echo "PID: $PID"
      echo "PID file: $PIDFILE"
      echo "Please investigate the process before removing the PID file."
    elif [ "$TYPE" == "server" ]; then
      echo "ERROR: $FULLPROG is running, but its web server is not responding correctly."
      echo "The expected process is running, but port $PORT did not return HTTP status 200."
      echo "PID: $PID"
      echo "Port: $PORT"
      echo "Check the sickchill logs before attempting to restart the service."
    else
      echo "ERROR: $FULLPROG is in an unknown broken state."
    fi

}

status()
{
  if [ "$STATUS" == "running" ]; then
    echo "$FULLPROG currently running."
  elif [ "$STATUS" == "stopped" ]; then
    echo "$FULLPROG not running."
  elif [ "$STATUS" == "broken" ]; then
    broken
  else
    echo "Status unknown."
  fi
}

start()
{
  local OUTPUT RETVAL ATTEMPTS STARTCMD COUNT FAILED=

  if [ "$STATUS" == "stopped" ]; then

    # Set the start command
    STARTCMD="/usr/bin/${PROG} --daemon --pidfile=${PIDFILE} --datadir=${DATADIR} --port=${PORT}"

    echo -n "Starting $PROG: "
    # Store the output to display later if launch failed.
    OUTPUT=$(su "$USERNAME" -s /bin/sh -c "$STARTCMD" 2>&1)
    RETVAL=$?

    # If the startup command succeeds, check over 5 attempts to see if the
    # server responds correctly.
    if [ "$RETVAL" -eq 0 ]; then
      ATTEMPTS=5
      for (( COUNT=0; COUNT < ATTEMPTS; COUNT++ )); do
        if get_status; then
          echo "Startup Successful"
          return 0
        fi
        # If the PID isn't actually there, we can skip the rest of the attempts.
        if [ -f "$PIDFILE" ]; then
          PID=$(cat "$PIDFILE" 2>/dev/null)
          if [ -n "$PID" ] && ! kill -0 "$PID" 2>/dev/null; then
              break
          fi
        fi
        sleep 1
      done
      FAILED="sickchill did not respond on port $PORT within $ATTEMPTS attempts."
    else
      FAILED="The sickchill startup command returned an error."
    fi
  # If we aren't in stopped status, don't try and start
  else
    status
  fi

  # If startup failed, display error messages and exit
  if [ -n "$FAILED" ]; then
    echo "Startup Failed. $FAILED"
    echo "The command used for launching it was:"
    echo "su $USERNAME -s /bin/sh -c \"$STARTCMD\""
    echo "The following was the output from the startup command:"
    echo "$OUTPUT"
    return 1
  fi

}

forcestart()
{
  # Allow starting a server with a stale pid file
  if [ "$STATUS" == "broken" ] && [ "$TYPE" == "pid-stale" ]; then
    rm -f "$PIDFILE"
    check
    start
  elif [ "$STATUS" == "stopped" ]; then
    start
  elif [ "$STATUS" == "broken" ]; then
    broken
  else
    status
  fi
}

stop()
{
  local TIMEOUT COUNT SHUTDOWN=

  if [ "$STATUS" == "stopped" ]; then
    echo "$PROG doesn't seem to be running. Please try running"
    echo "$0 start"
  # If it isn't a broken server, attempt a proper shutdown before
  # going right to the force kill.
  elif [ "$STATUS" == "broken" ] && [ "$TYPE" != "server" ]; then
    broken
  else
    if [ "$EUID" -ne 0 ];then
      echo "Please run as root"
      exit 1
    fi

    # If it isn't a broken server, attempt a proper shutdown before
    # going right to the force kill.
    if [ "$TYPE" != "server" ]; then
      # sickchill can take some time to properly shut down.
      # It takes more than 10 seconds on my system to properly close.
      # If it doesn't close by the timeout, force close it.
      TIMEOUT=15
      echo -n "Giving $PROG $TIMEOUT seconds to shut down: "
      curl -s --max-time 5 http://localhost:"$PORT"/home/shutdown/?pid="$PID" | grep -q "shutting down"
      SHUTDOWN=failed
      for (( COUNT=0; COUNT < TIMEOUT; COUNT++ )); do
        if ! kill -0 "$PID" 2> /dev/null; then
          SHUTDOWN=success
          break
        fi
        sleep 1
      done
    fi
    if [ "$SHUTDOWN" == "success" ]; then
      echo "Shutdown successful."
    else
      if [ "$SHUTDOWN" == "failed" ]; then
        echo "Normal Shutdown Failed - Attempting to kill the process."
      else
        echo "Server is not responding - Attempting to kill the process."
      fi
      kill -9 "$PID"
      sleep 1

      if kill -0 "$PID" 2>/dev/null; then
        echo "ERROR: Failed to terminate PID $PID."
        return 1
      fi
    fi
  fi
}

case "$1" in
  start)
        check
        start
        ;;
  force-start)
        check
        forcestart
        ;;
  stop)
        check
        stop
        ;;
  restart)
        check
        stop
        sleep 1
        check
        start
        ;;
  status)
        check
        status
        ;;
  *)
        echo "Usage: $0 {start|force-start|stop|restart|status}"
        exit 1
esac