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 org.junit.jupiter.api.Test;
import org.springframework.dao.DuplicateKeyException;
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;

class EventInboxServiceTest {
    private final ObjectMapper objectMapper = new ObjectMapper();
    private final InboxStore store = mock(InboxStore.class);
    private final EventInboxService service = service("OVERSEAS");

    @Test
    void 首次事件落库并返回已接收() {
        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 拒绝旧数字规范化摘要() {
        EventEnvelope source = envelope("sha256:placeholder");
        source.payload().withObject("/snapshot").put("weight", 30.0).put("volume", 0.3150);
        String legacyHash = EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalizeLegacy(source.payload()));
        EventEnvelope envelope = 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(), legacyHash);

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

    @Test
    void 相同事件和摘要重复接收不再次写入() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        BridgeInbox existing = existing(envelope, envelope.payloadHash());
        when(store.findByEventId(envelope.eventId())).thenReturn(existing);

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

    @Test
    void 相同事件但摘要不同时拒绝覆盖() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        when(store.findByEventId(envelope.eventId())).thenReturn(existing(envelope, "sha256:" + "0".repeat(64)));

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

    @Test
    void 相同事件和摘要但聚合标识不同时拒绝覆盖() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        EventEnvelope conflicting = new EventEnvelope(envelope.eventId(), envelope.eventType(), envelope.eventVersion(),
                envelope.occurredAt(), envelope.sourceRegion(), envelope.targetRegion(), envelope.tenantId(),
                envelope.aggregateType(), "DIFFERENT", envelope.aggregateVersion(), envelope.handoverVersion(),
                envelope.traceId(), envelope.correlationId(), envelope.causationId(), envelope.payload(), envelope.payloadHash());
        when(store.findByEventId(conflicting.eventId())).thenReturn(existing(envelope, envelope.payloadHash()));

        assertThatThrownBy(() -> service.receive(conflicting))
                .isInstanceOf(IllegalArgumentException.class)
                .hasMessageContaining("事件信封");
    }

    @Test
    void 并发插入冲突后按既有记录判定为重复() {
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));
        when(store.findByEventId(envelope.eventId())).thenReturn(null, existing(envelope, envelope.payloadHash()));
        doThrow(new DuplicateKeyException("并发重复")).when(store).insert(any());

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

    @Test
    void 目标区域与当前部署区域不一致时拒绝接收() {
        EventInboxService cnService = service("CN");
        EventEnvelope envelope = withHash(envelope("sha256:placeholder"));

        assertThatThrownBy(() -> cnService.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 EventInboxService service(String region) {
        EventInboxService service = new EventInboxService();
        ReflectionTestUtils.setField(service, "inboxStore", store);
        ReflectionTestUtils.setField(service, "objectMapper", objectMapper);
        ReflectionTestUtils.setField(service, "localRegion", region);
        return service;
    }

    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(EventEnvelope envelope, String hash) {
        BridgeInbox inbox = new BridgeInbox();
        inbox.setEventId(envelope.eventId());
        inbox.setEventType(envelope.eventType());
        inbox.setEventVersion(envelope.eventVersion());
        inbox.setSourceRegion(envelope.sourceRegion().name());
        inbox.setTargetRegion(envelope.targetRegion().name());
        inbox.setCustomerId(envelope.tenantId());
        inbox.setAggregateType(envelope.aggregateType());
        inbox.setAggregateId(envelope.aggregateId());
        inbox.setAggregateVersion(envelope.aggregateVersion());
        inbox.setHandoverVersion(envelope.handoverVersion());
        inbox.setOccurredAt(envelope.occurredAt());
        inbox.setTraceId(envelope.traceId());
        inbox.setCorrelationId(envelope.correlationId());
        inbox.setCausationId(envelope.causationId());
        inbox.setPayloadHash(hash);
        inbox.setReceivedAt(LocalDateTime.of(2026, 7, 29, 18, 0));
        return inbox;
    }
}