#
#    Copyright (c) 2023 Project CHIP Authors
#    All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#

import queue
import time
import typing
from datetime import datetime, timedelta, timezone

import chip.clusters as Clusters
from chip.clusters.Types import NullValue
from chip.interaction_model import InteractionModelError
from chip.tlv import uint
from matter_testing_support import (MatterBaseTest, SimpleEventCallback, async_test_body, default_matter_test_main,
                                    utc_time_in_matter_epoch)
from mobly import asserts


def get_wait_seconds_from_set_time(set_time_matter_us: int, wait_seconds: int):
    seconds_passed = int((utc_time_in_matter_epoch() - set_time_matter_us)/1000000)
    return wait_seconds - seconds_passed


class TC_TIMESYNC_2_10(MatterBaseTest):
    async def send_set_time_zone_cmd(self, tz: typing.List[Clusters.Objects.TimeSynchronization.Structs.TimeZoneStruct]) -> Clusters.Objects.TimeSynchronization.Commands.SetTimeZoneResponse:
        ret = await self.send_single_cmd(cmd=Clusters.Objects.TimeSynchronization.Commands.SetTimeZone(timeZone=tz), endpoint=self.endpoint)
        return ret

    async def send_set_dst_cmd(self, dst: typing.List[Clusters.Objects.TimeSynchronization.Structs.DSTOffsetStruct]) -> None:
        await self.send_single_cmd(cmd=Clusters.Objects.TimeSynchronization.Commands.SetDSTOffset(DSTOffset=dst))

    async def send_set_utc_cmd(self, utc: uint) -> None:
        await self.send_single_cmd(cmd=Clusters.Objects.TimeSynchronization.Commands.SetUTCTime(UTCTime=utc, granularity=Clusters.Objects.TimeSynchronization.Enums.GranularityEnum.kMillisecondsGranularity))

    def pics_TC_TIMESYNC_2_10(self) -> list[str]:
        return ["TIMESYNC.S.F00"]

    @async_test_body
    async def test_TC_TIMESYNC_2_10(self):

        self.endpoint = 0

        self.print_step(0, "Commissioning, already done")
        time_cluster = Clusters.Objects.TimeSynchronization
        tz_struct = time_cluster.Structs.TimeZoneStruct
        dst_struct = time_cluster.Structs.DSTOffsetStruct

        self.print_step(1, "Send SetUTCCommand")
        # It doesn't actually matter if this succeeds. The DUT is free to reject this command and use its own time.
        # If the DUT fails to get the time completely, all other tests will fail.
        try:
            await self.send_set_utc_cmd(utc_time_in_matter_epoch())
        except InteractionModelError:
            pass

        self.print_step(2, "Send SetTimeZone command")
        tz = [tz_struct(offset=7200, validAt=0)]
        ret = await self.send_set_time_zone_cmd(tz)
        asserts.assert_true(ret.DSTOffsetRequired, "DSTOffsetRequired not set to true")

        self.print_step(3, "Send SetDSTOffset command")
        dst = [dst_struct(offset=3600, validStarting=0, validUntil=NullValue)]
        await self.send_set_dst_cmd(dst)

        self.print_step(4, "Subscribe to DSTTableEmpy event")
        event = time_cluster.Events.DSTTableEmpty
        q = queue.Queue()
        cb = SimpleEventCallback("DSTTableEmpty", event.cluster_id, event.event_id, q)
        urgent = 1
        subscription = await self.default_controller.ReadEvent(nodeid=self.dut_node_id, events=[(self.endpoint, event, urgent)], reportInterval=[1, 3])
        subscription.SetEventUpdateCallback(callback=cb)

        self.print_step(5, "Send SetTimeZone command")
        tz = [tz_struct(offset=3600, validAt=0)]
        ret = await self.send_set_time_zone_cmd(tz)
        asserts.assert_true(ret.DSTOffsetRequired, "DSTOffsetRequired not set to true")

        self.print_step(6, "Wait for DSTTableEmpty event")
        try:
            q.get(block=True, timeout=5)
        except queue.Empty:
            asserts.fail("Did not receive DSTTableEmpy event")

        self.print_step(7, "Set DSTOffset to expire in 10 seconds")
        th_utc = utc_time_in_matter_epoch(datetime.now(tz=timezone.utc))
        expiry = utc_time_in_matter_epoch(datetime.now(tz=timezone.utc) + timedelta(seconds=10))
        dst = [dst_struct(offset=3600, validStarting=0, validUntil=expiry)]
        await self.send_set_dst_cmd(dst)

        self.print_step(8, "Wait until th_utc + 15s")
        time.sleep(get_wait_seconds_from_set_time(th_utc, 15))

        self.print_step(9, "Read LocalTime from the DUT")
        await self.read_single_attribute_check_success(cluster=Clusters.TimeSynchronization,
                                                       attribute=Clusters.TimeSynchronization.Attributes.LocalTime)

        self.print_step(10, "Wait for DSTTableEmpty event")
        timeout = get_wait_seconds_from_set_time(th_utc, 20)
        try:
            q.get(block=True, timeout=timeout)
        except queue.Empty:
            asserts.fail("Did not receive DSTTableEmpy event")
            pass

        self.print_step(11, "Set time zone back to 0")
        tz = [tz_struct(offset=0, validAt=0)]
        ret = await self.send_set_time_zone_cmd(tz)
        asserts.assert_true(ret.DSTOffsetRequired, "DSTOffsetRequired not set to true")

        self.print_step(12, "Set DST back to 0")
        dst = [dst_struct(offset=0, validStarting=0, validUntil=NullValue)]
        await self.send_set_dst_cmd(dst)


if __name__ == "__main__":
    default_matter_test_main()