# Copyright 2003-2017 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This file was written by Joel Brobecker (brobecker@gnat.com), derived
# from xfullpath.exp.

load_lib selftest-support.exp

proc attach_first_observer { message } {
    gdb_test_no_output "set \$first_obs = observer_attach_test_notification (&observer_test_first_notification_function)" \
	"$message; attach first observer"
}

proc attach_second_observer { message } {
    gdb_test_no_output "set \$second_obs = observer_attach_test_notification (&observer_test_second_notification_function)" \
	"$message; attach second observer"
}

proc attach_third_observer { message } {
    gdb_test_no_output "set \$third_obs = observer_attach_test_notification (&observer_test_third_notification_function)" \
	"$message; attach third observer"
}

proc detach_first_observer { message } {
    gdb_test_no_output "call observer_detach_test_notification (\$first_obs)" \
	"$message; detach first observer"
}

proc detach_second_observer { message } {
    gdb_test_no_output "call observer_detach_test_notification (\$second_obs)" \
	"$message; detach second observer"
}

proc detach_third_observer { message } {
    gdb_test_no_output "call observer_detach_test_notification (\$third_obs)" \
	"$message; detach third observer"
}

proc check_counters { first second third message } {
    gdb_test "print observer_test_first_observer" \
	".\[0-9\]+ =.*$first" \
	"$message; check first observer counter value"
    gdb_test "print observer_test_second_observer" \
	".\[0-9\]+ =.*$second" \
	"$message; check second observer counter value"
    gdb_test "print observer_test_third_observer" \
	".\[0-9\]+ =.*$third" \
	"$message; check third observer counter value"
}

proc reset_counters { message } {
    gdb_test_no_output "set variable observer_test_first_observer = 0" \
	"$message; reset first observer counter"
    gdb_test_no_output "set variable observer_test_second_observer = 0" \
	"$message; reset second observer counter"
    gdb_test_no_output "set variable observer_test_third_observer = 0" \
	"$message; reset third observer counter"
}

proc test_notifications { first second third message args } {
    # Do any initialization
    for {set i 0} {$i < [llength $args]} {incr i} {
	[lindex $args $i] $message
    }
    reset_counters $message
    # Call observer_notify_test_notification.  Note that this procedure
    # takes one argument, but this argument is ignored by the observer
    # callbacks we have installed.  So we just pass an arbitrary value.
    gdb_test_no_output "call observer_notify_test_notification (0)" \
	"$message; sending notification"
    check_counters $first $second $third $message
}

proc test_observer {} {
    # First, try sending a notification without any observer attached.
    test_notifications 0 0 0 "no observer attached"

    # Now, attach one observer, and send a notification.
    test_notifications 0 1 0 "second observer attached" \
	attach_second_observer

    # Remove the observer, and send a notification.
    test_notifications 0 0 0 "second observer detached" \
	detach_second_observer

    # With a new observer.
    test_notifications 1 0 0 "1st observer added" \
	attach_first_observer

    # With 2 observers.
    test_notifications 1 1 0 "2nd observer added" \
	attach_second_observer

    # With 3 observers.
    test_notifications 1 1 1 "3rd observer added" \
	attach_third_observer

    # Remove middle observer.
    test_notifications 1 0 1 "2nd observer removed" \
	detach_second_observer

    # Remove first observer.
    test_notifications 0 0 1 "1st observer removed" \
	detach_first_observer

    # Remove last observer.
    test_notifications 0 0 0 "3rd observer removed" \
	detach_third_observer

    # Go back to 3 observers, and remove them in a different order...
    test_notifications 1 1 1 "three observers added" \
	attach_first_observer \
	attach_second_observer \
	attach_third_observer 

    # Remove the third observer.
    test_notifications 1 1 0 "third observer removed" \
	detach_third_observer

    # Remove the second observer.
    test_notifications 1 0 0 "second observer removed" \
	detach_second_observer

    # Remove the first observer, no more observers.
    test_notifications 0 0 0 "first observer removed" \
	detach_first_observer

    return 0
}

do_self_tests captured_main test_observer