"""
Copyright (c) Contributors to the Open 3D Engine Project.
For complete copyright and license terms please see the LICENSE at the root of this distribution.

SPDX-License-Identifier: Apache-2.0 OR MIT
"""


# Test case ID : C100000
# Test Case Title : Check that Gravity works



# fmt:off
class Tests():
    enter_game_mode          = ("Entered game mode",        "Failed to enter game mode")
    find_ball                = ("Entity Ball found",        "Ball not found")
    gravity_started_disabled = ("Gravity started disabled", "Gravity didn't start disabled")
    gravity_set_enabled      = ("Gravity has been enabled", "Gravity wasn't enabled")
    ball_fell                = ("Ball fell",                "Ball didn't fall")
    exit_game_mode           = ("Exited game mode",         "Couldn't exit game mode")
# fmt:on


def C100000_RigidBody_EnablingGravityWorksPoC():
    import os
    import sys
    from editor_python_test_tools.utils import Report
    from editor_python_test_tools.utils import TestHelper as helper

    import azlmbr.legacy.general as general
    import azlmbr.bus

    helper.init_idle()
    helper.open_level("Physics", "EnablingGravityWorks")
    helper.enter_game_mode(Tests.enter_game_mode)

    # 3) Retrieve entities
    general.idle_wait_frames(1)
    ball_id = general.find_game_entity("Ball")
    Report.critical_result(Tests.find_ball, ball_id.IsValid(), "Entity must be found")

    # 4) Make sure gravity is off from the start
    gravity_enabled = azlmbr.physics.RigidBodyRequestBus(azlmbr.bus.Event, "IsGravityEnabled", ball_id)
    Report.critical_result(Tests.gravity_started_disabled, not gravity_enabled)

    # 5) Get the Z position before enabling the physics
    class Ball:
        z_start = None

    Ball.z_start = azlmbr.components.TransformBus(azlmbr.bus.Event, "GetWorldZ", ball_id)

    # 6) Activate gravity
    Report.info("Enabling Gravity")
    azlmbr.physics.RigidBodyRequestBus(azlmbr.bus.Event, "ForceAwake", ball_id)
    azlmbr.physics.RigidBodyRequestBus(azlmbr.bus.Event, "SetGravityEnabled", ball_id, True)
    gravity_enabled = azlmbr.physics.RigidBodyRequestBus(azlmbr.bus.Event, "IsGravityEnabled", ball_id)
    
    def ball_fell():
        """
        This is an example function to use with TestHelper.wait_for_condition
        It may take no parameters and it contains no wait_idle_* because that is
        already handled in TestHelper.wait_for_condition
        """
        z_end = azlmbr.components.TransformBus(azlmbr.bus.Event, "GetWorldZ", ball_id)
        return Ball.z_start > z_end

    # 7) Validate ball fell by ensuring z is decreasing
    fell_down = helper.wait_for_condition(ball_fell, 1.0)
    Report.result(Tests.ball_fell, fell_down)

    helper.exit_game_mode(Tests.exit_game_mode)

if __name__ == "__main__":
    from editor_python_test_tools.utils import Report
    Report.start_test(C100000_RigidBody_EnablingGravityWorksPoC)