package com.battery.business.service.impl;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.io.IOException;
import java.math.BigDecimal;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import org.awaitility.Awaitility;
import org.junit.jupiter.api.Test;
import org.springframework.web.context.request.async.AsyncRequestNotUsableException;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
import com.battery.device.api.TestDataObservationAdapter;
import com.battery.business.web.TestLiveStream;
import com.battery.business.service.ITestLiveService;
import com.battery.device.api.discovery.DeviceDiscoveryCandidateStore;
import com.battery.device.api.model.ChannelIdentity;
import com.battery.device.api.model.DeviceWorkStatus;
import com.battery.device.api.model.RealtimeSnapshot;
import com.battery.business.domain.TTest;
import com.battery.business.domain.TTestBattery;
import com.battery.business.domain.TTestChannelBinding;
import com.battery.business.domain.TTestWarningException;
import com.battery.business.mapper.TTestMapper;
import com.battery.business.service.ITTestService;
import com.battery.business.service.ITestLiveService.LiveState;

/** 实时流客户端断连时应结束连接而不触发全局异常处理。 */
class TTestLiveServiceImplTest
{
    @Test
    void nonReceivingConsoleReadsCollectorStatusWithoutRequestingMeasurements() throws Exception
    {
        try (var simulator = new com.battery.device.simulator.BtsDevelopmentSimulator(0))
        {
            TTest test = test("RECEIVING");
            test.getBatteries().get(0).setCollectorId(7L);
            var tests = mock(ITTestService.class);
            when(tests.selectTestById(10L)).thenReturn(test);
            var mapper = mock(TTestMapper.class);
            when(mapper.selectCollectorCode(7L)).thenReturn("dev-sim-collector-1");
            var candidates = new com.battery.device.api.discovery.InMemoryDeviceDiscoveryCandidateStore();
            Instant now = Instant.now();
            candidates.replaceCollectors("dev-sim", List.of(new DeviceDiscoveryCandidateStore.CollectorCandidate(
                    "dev-sim", "dev-sim-collector-1", "127.0.1.2", null, "模拟采集器", null, null,
                    4, true, now, now.plusSeconds(30))));
            var service = new TTestLiveServiceImpl(tests, candidates, simulator, mapper);
            service.current(10L);
            var received = simulator.snapshot().recentRequests();
            assertTrue(received.stream().anyMatch(item -> item.command().equals("collector-realtime")));
            for (String status : List.of("PAUSED", "ENDED", "NOT_STARTED"))
            {
                test.setReceptionStatus(status);
                var source = service.current(10L).sources().stream()
                        .filter(item -> item.sourceType().equals("COLLECTOR")).findFirst().orElseThrow();
                assertEquals("ONLINE", source.deviceStatus());
                assertTrue(source.latestSnapshot().isEmpty());
                assertEquals(received, simulator.snapshot().recentRequests());
            }
        }
    }

    @Test
    void notStartedShouldNotExposePreTestDeviceSnapshot()
    {
        Instant now = Instant.parse("2026-09-02T06:00:00Z");
        TTest test = test("NOT_STARTED");
        TTestLiveServiceImpl service = liveService(test, now);

        LiveState state = service.current(10L);

        assertTrue(state.sources().stream().allMatch(source -> source.latestSnapshot().isEmpty()));
    }

    @Test
    void receivingShouldExposeBtsCoreMeasurements()
    {
        Instant now = Instant.parse("2026-09-02T06:00:00Z");
        TTest test = test("RECEIVING");
        TTestLiveServiceImpl service = liveService(test, now);

        LiveState state = service.current(10L);
        var snapshot = state.sources().stream().filter(source -> "CABINET_CHANNEL".equals(source.sourceType()))
                .findFirst().orElseThrow().latestSnapshot();

        assertEquals(new BigDecimal("3.700"), snapshot.get("voltageV"));
        assertEquals(new BigDecimal("1.200"), snapshot.get("currentA"));
        assertEquals(new BigDecimal("2.500"), snapshot.get("capacityAh"));
        assertEquals(now.toEpochMilli(), snapshot.get("observedAt"));
    }

    @Test
    void onlineCabinetWithStoppedWorkStatusShouldRemainOnlineAndNotRaiseSourceAlarm()
    {
        Instant now = Instant.parse("2026-09-02T06:00:00Z");
        TTestLiveServiceImpl service = liveService(test("RECEIVING"), now, true, DeviceWorkStatus.STOPPED);

        LiveState state = service.current(10L);
        var cabinet = state.sources().stream().filter(source -> "CABINET_CHANNEL".equals(source.sourceType()))
                .findFirst().orElseThrow();

        assertEquals("ONLINE", cabinet.deviceStatus());
        assertTrue(state.exceptions().isEmpty());
    }

    @Test
    void pausedShouldNotExposeUnavailableSourceAsAlarm()
    {
        Instant now = Instant.parse("2026-09-02T06:00:00Z");
        TTest test = test("PAUSED");
        TTestLiveServiceImpl service = liveService(test, now, false);

        LiveState state = service.current(10L);

        assertTrue(state.exceptions().isEmpty());
    }

    @Test
    void completedTestShouldNotExposeOpenWarningInLiveAlarm()
    {
        Instant now = Instant.parse("2026-09-02T06:00:00Z");
        TTestMapper mapper = mock(TTestMapper.class);
        TTestWarningException warning = new TTestWarningException();
        warning.setExceptionId(1L);
        warning.setSourceType("COLLECTOR");
        warning.setMetricCode("TEMPERATURE");
        warning.setAbnormalValue(new BigDecimal("25.3"));
        warning.setUnit("℃");
        warning.setExceptionStatus("OPEN");
        when(mapper.selectWarningExceptions(10L, "OPEN")).thenReturn(List.of(warning));

        TTestLiveServiceImpl service = liveService(test("ENDED"), now, true, DeviceWorkStatus.STOPPED, mapper);

        LiveState state = service.current(10L);

        assertTrue(state.exceptions().isEmpty());
        verify(mapper, never()).selectWarningExceptions(10L, "OPEN");
    }

    private static TTest test(String receptionStatus)
    {
        TTest test = new TTest();
        test.setTestId(10L);
        test.setTestStatus("RECEIVING".equals(receptionStatus) ? "RUNNING" : "WAITING");
        test.setReceptionStatus(receptionStatus);
        TTestBattery battery = new TTestBattery();
        battery.setBatteryNo("B-01");
        TTestChannelBinding binding = new TTestChannelBinding();
        binding.setChannelId(1L);
        binding.setAdapterCode("dev-sim");
        binding.setDevtype(1);
        binding.setDevid(1);
        binding.setSubdevid(0);
        binding.setChlid(1);
        battery.setBinding(binding);
        test.setBatteries(List.of(battery));
        return test;
    }

    private static TTestLiveServiceImpl liveService(TTest test, Instant now)
    {
        return liveService(test, now, true);
    }

    private static TTestLiveServiceImpl liveService(TTest test, Instant now, boolean online)
    {
        return liveService(test, now, online, DeviceWorkStatus.WORKING);
    }

    private static TTestLiveServiceImpl liveService(TTest test, Instant now, boolean online,
            DeviceWorkStatus workStatus)
    {
        return liveService(test, now, online, workStatus, null);
    }

    private static TTestLiveServiceImpl liveService(TTest test, Instant now, boolean online,
            DeviceWorkStatus workStatus, TTestMapper mapper)
    {
        DeviceDiscoveryCandidateStore candidates = mock(DeviceDiscoveryCandidateStore.class);
        TestDataObservationAdapter simulator = mock(TestDataObservationAdapter.class);
        ITTestService tests = mock(ITTestService.class);
        when(tests.selectTestById(10L)).thenReturn(test);
        ChannelIdentity identity = new ChannelIdentity("dev-sim", 1, 1, 0, 1);
        RealtimeSnapshot snapshot = new RealtimeSnapshot(identity, workStatus, 1, 1, "cc", null,
                new BigDecimal("1.200"), new BigDecimal("3.700"), new BigDecimal("2.500"),
                new BigDecimal("9.250"), 12L, 12L, "0", now,
                java.util.Map.of());
        DeviceDiscoveryCandidateStore.ChannelCandidate channel = new DeviceDiscoveryCandidateStore.ChannelCandidate(
                identity, online, workStatus, now, snapshot);
        DeviceDiscoveryCandidateStore.CabinetCandidate cabinet = new DeviceDiscoveryCandidateStore.CabinetCandidate(
                "dev-sim", 1L, "dev-sim", 1, 1, "127.0.0.2", "mac", "cabinet", "vendor", "model",
                List.of(channel), now, now.plusSeconds(60));
        when(candidates.snapshot(any(Instant.class))).thenReturn(
                new DeviceDiscoveryCandidateStore.CandidateSnapshot(List.of(cabinet), List.of()));
        var plan = new TestDataObservationAdapter.TestPlan(1, 1, 1, List.of());
        when(simulator.testPlan(any(ChannelIdentity.class))).thenReturn(plan);

        return new CurrentLiveService(tests, candidates, simulator, mapper);
    }

    @Test
    void initialWriteFailureShouldCompleteStreamWithoutErrorDispatch()
    {
        RecordingEmitter emitter = new RecordingEmitter(0);
        TestLiveStream service = new TestableLiveService(emitter);

        try
        {
            service.stream(4L);
        }
        finally
        {
            service.close();
        }

        assertTrue(emitter.completed);
        assertFalse(emitter.completedWithError);
    }

    @Test
    void scheduledWriteFailureShouldCompleteStreamWithoutErrorDispatch()
    {
        RecordingEmitter emitter = new RecordingEmitter(6);
        TestLiveStream service = new TestableLiveService(emitter);

        try
        {
            service.stream(4L);
            Awaitility.await().atMost(Duration.ofSeconds(5)).until(() -> emitter.completed);
        }
        finally
        {
            service.close();
        }

        assertFalse(emitter.completedWithError);
    }

    private static final class TestableLiveService extends TestLiveStream
    {
        private final RecordingEmitter emitter;

        private TestableLiveService(RecordingEmitter emitter)
        {
            super(testLive());
            this.emitter = emitter;
        }

        @Override
        protected SseEmitter createEmitter()
        {
            return emitter;
        }

        private static ITestLiveService testLive() {
            ITestLiveService live = mock(ITestLiveService.class);
            when(live.current(any())).thenReturn(new LiveState(4L, "RUNNING", "RECEIVING", Instant.now(), List.of(), List.of()));
            return live;
        }
    }

    private static final class CurrentLiveService extends TTestLiveServiceImpl
    {
        private CurrentLiveService(ITTestService tests, DeviceDiscoveryCandidateStore candidates,
                TestDataObservationAdapter simulator, TTestMapper mapper)
        {
            super(tests, candidates, simulator, mapper);
        }
    }

    private static final class RecordingEmitter extends SseEmitter
    {
        private final int successfulWrites;
        private int writes;
        private volatile boolean completed;
        private volatile boolean completedWithError;

        private RecordingEmitter(int successfulWrites)
        {
            this.successfulWrites = successfulWrites;
        }

        @Override
        public void send(SseEventBuilder builder) throws IOException
        {
            if (writes++ >= successfulWrites)
                throw new AsyncRequestNotUsableException("client disconnected", new IOException("connection closed"));
        }

        @Override
        public synchronized void complete()
        {
            completed = true;
        }

        @Override
        public synchronized void completeWithError(Throwable error)
        {
            completedWithError = true;
        }
    }
}