package com.baiyue.eventbridge.service;

import com.baiyue.common.event.EventEnvelope;
import com.baiyue.common.event.EventPayloadCanonicalizer;
import com.baiyue.common.event.EventPayloadHash;
import com.baiyue.common.event.RegionCode;
import com.baiyue.eventbridge.domain.BridgeInbox;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.annotation.Resource;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
import org.springframework.test.util.ReflectionTestUtils;

import java.time.Instant;
import java.time.LocalDateTime;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@DisplayName("跨区域事件收件箱")
@SpringJUnitConfig(classes = {EventInboxService.class, EventInboxServiceTest.TestConfig.class})
@TestPropertySource(properties = "baiyue.region=OVERSEAS")
class EventInboxServiceTest {
    @Resource
    private ObjectMapper objectMapper;
    @MockBean
    private InboxStore store;
    @Resource
    private EventInboxService service;

    @Configuration(proxyBeanMethods = false)
    static class TestConfig {
        @Bean
        ObjectMapper objectMapper() {
            return new ObjectMapper();
        }
    }

    @AfterEach
    void resetRegion() {
        ReflectionTestUtils.setField(service, "localRegion", "OVERSEAS");
    }

    @Test
    void firstEventPersistsAndReturnsReceived() {
        EventEnvelope envelope = envelope("sha256:placeholder");
        envelope = withHash(envelope);

        assertThat(service.receive(envelope).result()).isEqualTo("已接收");
        verify(store).insert(any(BridgeInbox.class));
    }

    @Test
    void identicalEventAndDigestDoesNotPersistAgain() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        BridgeInbox existing = existing(envelope.payloadHash());
        when(store.findByEventId(envelope.eventId())).thenReturn(existing);

        assertThat(service.receive(envelope).result()).isEqualTo("重复");
    }

    @Test
    void sameEventWithDifferentDigestRejectsOverwrite() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        when(store.findByEventId(envelope.eventId())).thenReturn(existing("sha256:" + "0".repeat(64)));

        assertThatThrownBy(() -> service.receive(envelope))
                .isInstanceOf(IllegalArgumentException.class)
                .hasMessageContaining("拒绝覆盖");
    }

    @Test
    void duplicateInsertAfterRaceIsTreatedAsDuplicate() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        when(store.findByEventId(envelope.eventId())).thenReturn(null, existing(envelope.payloadHash()));
        doThrow(new DuplicateKeyException("并发重复")).when(store).insert(any());

        assertThat(service.receive(envelope).result()).isEqualTo("重复");
    }

    @Test
    void targetRegionDifferentFromCurrentDeploymentIsRejected() {
        ReflectionTestUtils.setField(service, "localRegion", "CN");
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));

        assertThatThrownBy(() -> service.receive(envelope))
                .isInstanceOf(IllegalArgumentException.class)
                .hasMessageContaining("目标区域");
    }

    private EventEnvelope envelope(String hash) {
        return new EventEnvelope("550e8400-e29b-41d4-a716-446655440000", "OrderApproved", 1,
                Instant.parse("2026-07-29T08:30:00Z"), RegionCode.CN, RegionCode.OVERSEAS,
                "20001", "ORDER", "90001", 1, null, "trace-1", "flow-1", null,
                objectMapper.createObjectNode().put("orderId", "90001"), hash);
    }

    private EventEnvelope withHash(EventEnvelope source) {
        String hash = EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalize(source.payload()));
        return new EventEnvelope(source.eventId(), source.eventType(), source.eventVersion(), source.occurredAt(),
                source.sourceRegion(), source.targetRegion(), source.tenantId(), source.aggregateType(),
                source.aggregateId(), source.aggregateVersion(), source.handoverVersion(), source.traceId(),
                source.correlationId(), source.causationId(), source.payload(), hash);
    }

    private BridgeInbox existing(String hash) {
        BridgeInbox inbox = new BridgeInbox();
        inbox.setEventId("550e8400-e29b-41d4-a716-446655440000");
        inbox.setPayloadHash(hash);
        inbox.setReceivedAt(LocalDateTime.of(2026, 7, 29, 18, 0));
        return inbox;
    }
}