#! /bin/sh

# When container starts verify that the trackers are configured.
# If they are, start the server otherwise run roundup-admin
# for installation and initialization.

# "$@" should be one of the recognized keywords or arguments for
# roundup-server including one or more tracker tracker=directory pairs.

# exit on errors; POSIX (e.g. dash as on ubuntu) doesn't support
# pipefail. So setting it will fail. Allow that to happen then
# set exit on error so the script will still run.
set -o pipefail
# not supported by POSIX shell, but then neither is pipefail.
trap "echo 'Exiting on pipefail'" ERR

set -e

if [ -n "$SHELL_DEBUG" ]; then
    set -xv
fi

trap exit INT

do_exit=0

if test -t 0 -a -t 1; then  # see if stdin/out are associated with a tty
    might_be_interactive="true"
else
    might_be_interactive="false"
fi

printf "Starting Roundup with arguments: $@"

for tracker_spec in "$@"; do
    # IFS== set a=b doesn't just assign $1 and $2 in busybox ash
    # it also clobbers '$@'. 'printf mumble | read' starts read in a
    # subshell so vars are not available in parent.
    IFS="=" read -r tracker directory <<- EOE
	$tracker_spec
	EOE
    # ^ is a tab for use with <<-

    if [ -z "$directory" ]; then
	# $tracker_spec was not in the form of a=b, check to see
	# if it's a request to start in demo/shell mode:
	case "$tracker" in
	    demo)
		# if grep does not find 2.2.0 it exits non-zero and
		# because of "-eo pipefail" the script exits. So || true
		# so pipeline exits true.
		version=$(roundup-admin -v | grep '2\.2\.0' || true)
		if [ -n "$version" ]; then
		    printf "\nRoundup version: %s does not support docker demo mode\n" "$version"
		    printf "Try building with a version newer than 2.2.0.\n"
		    printf "For example:\n"
		    printf " docker build --build-arg=\"source=pypi~=2.3.0a1\" ...\n"
		    exit 3
		fi

		if [ -z "$PORT_8080" ]; then
		  PORT_8080=8917
		  printf "  If docker reports a bind error, you can set the\n"
		  printf "  Docker environment variable PORT_8080 to\n"
		  printf "  fix it.\n\n"
		  printf "  Add -e PORT_8080=port_number to the docker run\n"
		  printf "  command. The port_number must match the first\n"
		  printf "  value to -p which must be an unused port\n"
		  printf "  on your server.\n\n"
		fi
		template=classic
	        backend=sqlite

		shift

		demoArgs=$#

		for arg in "$@"; do
		    # all keywords are unique, so iterate over all and
		    # assign as appropriate
		    case "$arg" in
			classic|devel|jinja2|minimal|responsive)
			    template="$arg";;

			anydbm|sqlite)
			    backend="$arg";;
			postgres|mysql)
			    printf "demo mode only supports sqlite or anydbm backends, not %s. Exiting." "$1"
			    exit 1;;
			nuke)
			    nuke="$arg";;
		    *) printf "Unknown argument %s.\n" "$1"
		       printf "Usage: demo [template] [db]\n"
		       printf "  template: one of "
		       printf "classic devel jinja2 minimal responsive\n"
		       printf "  db: one of: sqlite anydbm\n"
		       printf "default: classic sqlite\n"
		       printf "Exiting\n"
		       exit 1
		    esac
		    shift
		done

		# run demo make sure to set bind address -B to 0.0.0.0
		# otherwise we can never make it out of the docker container.
		# use -p to force port to match the exported docker port.
		if [ -f tracker/demo/config.ini ] && [ -z "$nuke" ]; then
		    if [ "$demoArgs" -ne 0 ]; then
			printf "Error: backend and template arguments to demo "
			printf "are invalid if a tracker\nis configured and "
			printf "'nuke' is not specified.\nExiting.\n"
			exit 1
		    fi
		    printf "Restarting existing tracker.\n"
		    # Restart an existing demo tracker.
		    exec roundup-demo \
			 -B 0.0.0.0 \
			 -p 8080 \
			 tracker/demo
                else
		    # Create new or nuke/create existing tracker.
		    # Set parameters required to create tracker.
		    # Inherit the url port spec from the environment
		    # variable PORT_8080 using default value or value 
		    # specified on the docker run command line.
		    printf "Creating new tracker.\n"
		    exec roundup-demo \
			 -B 0.0.0.0 \
			 -p 8080 \
			 -b "$backend" \
			 --urlport "$PORT_8080" \
			 -t "$template" \
			 tracker/demo \
			 $nuke
		fi
		;;
	    shell)
		if [ "$might_be_interactive" = "false" ]; then
		    printf \
		       "Error: must use -it on docker command line to invoke shell\n"
		    exit 3
		fi
		exec /bin/sh;;
	    admin)
	       shift
	       exec roundup-admin "$@";;

            help)
		sed -e 's/^\t\t//' <<EOH
		Example Usage:
		   docker run --rm -it -p 127.0.0.1:8917:8080 \\
		          -v $PWD:/usr/src/app/tracker \\              
		          --name roundup_demo docker/image ...

		where ... is:

		   help - this output

		   demo ... - run a demo tracker with optional arguments
		           tracker home is in '/usr/src/app/tracker/demo'
		           directory.

		   admin ... - start roundup-admin shell or execute following
		           arguments. Use '-i tracker/demo' to set tracker
		           home.

		   shell - start a unix shell for advanced config

		   roundup-server(1) arguments - at minimum one or more
		          tracker=tracker_home/directory
                      specifications. See documentation for details.

		   if no arguments are supplied, it will start the guided
		      install sequence. See documentation for details.

		demo Mode Arguments:

		   one optional template name:
		       classic, devel, jinja2, minimal, responsive

		   one optional database backend:
		       sqlite, anydbm

		   the term 'nuke' to destroy demo tracker and start over

		Other docker CLI Arguments:
		
		--env SHELL_DEBUG=1  - enable debug output from startup script

EOH
		exit 0
		;;
	    *)
		# we just continue. Allow setting CMD to:
		#    -i index_template issue=tracker
		# for example.
		continue
	esac
    fi

    # we have a tracker=directory spec. Validate it and see if we need to
    # install or initialize it.

    # something is specified or built wrong. Don't start.
    if [ ! -d "$directory" ]; then
        printf "Unable to find directory %s for tracker %s. Exiting.\n" \
	            "$directory" "$tracker"
	exit 1
    fi

    # verify that config.ini has been edited with a web spec.
    # user must at minimum define web in config.ini.
    if ! grep '^\s*web\s*=\s*' "$directory/config.ini" > /dev/null 2>&1
    then
	if [ -e "$directory/config.ini" ]; then
	    printf "Please edit %s/config.ini and set the required
parameters.\n" "$directory"
	    printf "The web setting appears to be missing.\n"
	    exit 3
	fi

        printf "Installing %s tracker in %s\n" "$tracker" "$directory"
        roundup-admin -i "$directory" install
        do_exit=1
    fi

    # we have a valid config.ini so init database if not done
    # if we get errors, the db directory should be missing
    # and we print an error.
    if [ $do_exit = 0 ] && ! [ -e "$directory/db" ]; then
	printf "Initializing tracker %s\n" "$tracker"
        if ! roundup-admin -i "$directory" init; then
           # something went wrong.
	   # verify it looks like a tracker directory
	   # then remove the database directory
	   test -e "$directory/TEMPLATE-INFO.txt" && \
           rm -rf "$directory/db"
	fi
	do_exit=1
    fi
done   # for "$@"

# if any config.ini needs editing don't start up.
if [ $do_exit = 0 ]; then
   # make roundup-server process pid 1 with exec
   exec roundup-server -n 0.0.0.0 "$@"
fi

exit 0