import { describe, expect, it, vi } from 'vitest';
import {
    createLogger,
    getLogLevel,
    runWithRequestId,
    setLogLevel,
    subscribeLogs,
    type LogEntry,
} from '@snowluma/common/logger';
import type { BridgeInterface } from '../../core/src/bridge/bridge-interface';
import { ApiHandler } from '../src/api-handler';
import { OneBotInstance } from '../src/instance';
import { buildApiContext, type OneBotInstanceContext } from '../src/instance-context';
import { hashMessageIdInt32, PRIVATE_NT_MESSAGE_EVENT } from '../src/message-id';
import { TempSessionStore } from '../src/temp-session-store';
import type { JsonObject, OneBotConfig } from '../src/types';

const SELF_ID = 10001;
const PEER_ID = 20002;
const RECEIPT = {
    messageId: 123456,
    sequence: 87,
    clientSequence: 9,
    random: 123456,
    timestamp: 1_700_000_000,
};
type Receipt = typeof RECEIPT;

function makeContext(receiptOrReceipts: Receipt | Receipt[] = RECEIPT): {
    ctx: OneBotInstanceContext;
    dispatchEvent: ReturnType<typeof vi.fn<(event: JsonObject) => void>>;
    events: Map<number, JsonObject>;
} {
    const receipts = Array.isArray(receiptOrReceipts) ? receiptOrReceipts : [receiptOrReceipts];
    let receiptIndex = 0;

    const nextReceipt = () => {
        const receipt = receipts[receiptIndex++];

        if (!receipt) {
            throw new Error('unexpected extra private send');
        }

        return receipt;
    };

    const events = new Map<number, JsonObject>();
    const dispatchEvent = vi.fn<(event: JsonObject) => void>();
    const bridge = {
        identity: { nickname: 'SnowLuma' },
        apis: {
            message: {
                sendPrivate: vi.fn(async () => nextReceipt()),
                sendGroupTempMessage: vi.fn(async () => nextReceipt()),
                sendC2cFile: vi.fn(async () => nextReceipt()),
            },
            groupFile: {
                uploadPrivate: vi.fn(async () => ({
                    fileId: 'uploaded-file-uuid',
                    fileHash: 'uploaded-file-hash',
                })),
            },
            forward: {
                upload: vi.fn(async () => 'forward-res-id'),
            },
        },
        resolveUserUid: vi.fn(async () => 'u_peer'),
        recallUploadedFile: vi.fn((fileId: string) =>
            fileId === 'uploaded-file-uuid'
                ? {
                      fileId,
                      scope: 'private',
                      userId: PEER_ID,
                      fileName: 'inline.txt',
                      fileSize: 3,
                      fileMd5: new Uint8Array(16),
                      fileSha1: new Uint8Array(20),
                      fileHash: 'uploaded-file-hash',
                      rememberedAt: Date.now(),
                  }
                : undefined,
        ),
    } as unknown as BridgeInterface;

    const ctx = {
        uin: String(SELF_ID),
        selfId: SELF_ID,
        bridge,
        messageStore: {
            findMedia: () => null,
            findEvent: (messageId: number) => events.get(messageId) ?? null,
            findMeta: () => null,
            resolveReplySequence: () => null,
            storeEvent: (
                messageId: number,
                _isGroup: boolean,
                _sessionId: number,
                _sequence: number,
                _eventName: string,
                event: JsonObject,
            ) => {
                events.set(messageId, event);
                return true;
            },
        },
        mediaStore: {},
        reactionStore: {},
        tempSessions: new TempSessionStore(),
        converterCtx: {
            selfId: SELF_ID,
            imageUrlResolver: null,
            mediaUrlResolver: null,
            messageIdResolver: null,
            mediaSegmentSink: null,
        },
        config: {
            networks: { httpServers: [], httpClients: [], wsServers: [], wsClients: [] },
        } as OneBotConfig,
        cacheMessageMeta: vi.fn(),
        dispatchEvent,
    } as unknown as OneBotInstanceContext;

    return { ctx, dispatchEvent, events };
}

interface InstanceHarness {
    dispatch(event: JsonObject, source: 'send' | 'bridge'): Promise<void>;
    emitEvent: ReturnType<typeof vi.fn<(event: JsonObject) => Promise<void>>>;
    stored: Map<number, JsonObject>;
}

function makeInstanceHarness(
    options: {
        statusCommand?: {
            enabled: boolean;
            swallow: boolean;
            cooldownSeconds: number;
            trigger: string;
        };
        logger?: ReturnType<typeof createLogger>;
    } = {},
): InstanceHarness {
    const stored = new Map<number, JsonObject>();
    const emitEvent = vi.fn(async (_event: JsonObject) => {});
    const instance = Object.create(OneBotInstance.prototype) as OneBotInstance;
    Object.assign(instance as unknown as Record<string, unknown>, {
        bridge: { identity: {} },
        ctx: {
            config: {
                statusCommand: options.statusCommand ?? {
                    enabled: false,
                    swallow: false,
                    cooldownSeconds: 5,
                    trigger: '#sl',
                },
            },
        },
        log: options.logger ?? { success: vi.fn(), trace: vi.fn(), warn: vi.fn() },
        messageStore: {
            findMedia: () => null,
            findEvent: (messageId: number) => stored.get(messageId) ?? null,
            storeEvent: (
                messageId: number,
                _isGroup: boolean,
                _sessionId: number,
                _sequence: number,
                _eventName: string,
                event: JsonObject,
            ) => {
                stored.set(messageId, event);
                return true;
            },
        },
        networkManager: { emitEvent },
        acceptingActions: true,
        uin: String(SELF_ID),
        statusCommandCooldown: new Map([['p:20002', Date.now()]]),
        recentSelfSentEvents: new Map(),
    });
    const dispatch = (
        instance as unknown as {
            dispatchEvent(event: JsonObject, source: 'send' | 'bridge'): Promise<void>;
        }
    ).dispatchEvent.bind(instance);
    return { dispatch, emitEvent, stored };
}

function privateSentEvent(overrides: JsonObject = {}): JsonObject {
    return {
        time: RECEIPT.timestamp,
        self_id: SELF_ID,
        post_type: 'message_sent',
        message_type: 'private',
        sub_type: 'friend',
        message_id: 987654,
        message_seq: RECEIPT.clientSequence,
        user_id: SELF_ID,
        target_id: PEER_ID,
        message: [{ type: 'text', data: { text: 'hello' } }],
        raw_message: 'hello',
        sender: { user_id: SELF_ID, nickname: 'SnowLuma' },
        ...overrides,
    };
}

function groupSentEvent(overrides: JsonObject = {}): JsonObject {
    return {
        ...privateSentEvent(),
        message_type: 'group',
        sub_type: 'normal',
        message_id: -7654321,
        message_seq: RECEIPT.sequence,
        group_id: 30003,
        target_id: undefined,
        ...overrides,
    };
}

describe('OneBot self-sent events', () => {
    it('reports a client private send once across repeated confirmations and pushes', async () => {
        const { dispatch, emitEvent, stored } = makeInstanceHarness();
        const event = privateSentEvent({ message_id: -7654321 });
        await Promise.all([dispatch(event, 'bridge'), dispatch({ ...event }, 'bridge')]);
        await dispatch({ ...event, raw_message: 'canonical content' }, 'bridge');
        expect(emitEvent).toHaveBeenCalledExactlyOnceWith(event);
        expect(stored.get(-7654321)?.raw_message).toBe('canonical content');
    });

    it('keeps private action deduplication for more than one echo', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const event = privateSentEvent();
        await dispatch(event, 'send');
        await dispatch({ ...event }, 'bridge');
        await dispatch({ ...event }, 'bridge');
        expect(emitEvent).toHaveBeenCalledOnce();
    });

    it('distinguishes private sends by identity and peer even when text is identical', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const event = privateSentEvent();
        await dispatch(event, 'bridge');
        await dispatch({ ...event, message_seq: RECEIPT.clientSequence + 1 }, 'bridge');
        await dispatch({ ...event, target_id: PEER_ID + 1 }, 'bridge');
        await dispatch({ ...event, message_id: -7654321 }, 'bridge');
        expect(emitEvent).toHaveBeenCalledTimes(4);
    });

    it('keeps private deduplication isolated and expires it without deleting history', async () => {
        vi.useFakeTimers();

        try {
            const first = makeInstanceHarness();
            const second = makeInstanceHarness();
            const event = privateSentEvent();
            await first.dispatch(event, 'bridge');
            await second.dispatch(
                { ...event, self_id: SELF_ID + 1, user_id: SELF_ID + 1 },
                'bridge',
            );
            expect(second.emitEvent).toHaveBeenCalledOnce();
            await first.dispatch(event, 'bridge');
            expect(first.emitEvent).toHaveBeenCalledOnce();
            vi.advanceTimersByTime(120_000);
            await first.dispatch(event, 'bridge');
            expect(first.emitEvent).toHaveBeenCalledTimes(2);
            expect(first.stored.has(987654)).toBe(true);
        } finally {
            vi.useRealTimers();
        }
    });

    it('reports a client group send once across repeated server pushes', async () => {
        const { dispatch, emitEvent, stored } = makeInstanceHarness();
        const event = groupSentEvent();

        await dispatch(event, 'bridge');
        await dispatch({ ...event, raw_message: 'canonical echo' }, 'bridge');
        await dispatch({ ...event, raw_message: 'latest canonical echo' }, 'bridge');

        expect(emitEvent).toHaveBeenCalledOnce();
        expect(emitEvent).toHaveBeenCalledWith(event);
        expect(stored.get(-7654321)?.raw_message).toBe('latest canonical echo');
    });

    it('reports concurrent copies of a client group send only once', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const event = groupSentEvent();

        await Promise.all([
            dispatch({ ...event }, 'bridge'),
            dispatch({ ...event }, 'bridge'),
            dispatch({ ...event }, 'bridge'),
        ]);

        expect(emitEvent).toHaveBeenCalledOnce();
    });

    it('keeps group sends with identical text but different message identities', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const event = groupSentEvent();

        await dispatch(event, 'bridge');
        await dispatch({ ...event, message_seq: RECEIPT.sequence + 1 }, 'bridge');
        await dispatch({ ...event, group_id: 30004 }, 'bridge');
        await dispatch({ ...event, message_id: -7654322 }, 'bridge');

        expect(emitEvent).toHaveBeenCalledTimes(4);
    });

    it('keeps group deduplication isolated between account instances', async () => {
        const first = makeInstanceHarness();
        const second = makeInstanceHarness();

        await first.dispatch(groupSentEvent(), 'bridge');
        await second.dispatch(
            groupSentEvent({ self_id: SELF_ID + 1, user_id: SELF_ID + 1 }),
            'bridge',
        );

        expect(first.emitEvent).toHaveBeenCalledOnce();
        expect(second.emitEvent).toHaveBeenCalledOnce();
    });

    it('expires group self-send identities without treating stored history as already reported', async () => {
        vi.useFakeTimers();

        try {
            const { dispatch, emitEvent } = makeInstanceHarness();
            const event = groupSentEvent();

            await dispatch(event, 'bridge');
            await dispatch({ ...event }, 'bridge');
            expect(emitEvent).toHaveBeenCalledOnce();

            vi.advanceTimersByTime(120_000);
            await dispatch({ ...event }, 'bridge');
            expect(emitEvent).toHaveBeenCalledTimes(2);
        } finally {
            vi.useRealTimers();
        }
    });

    it('keeps the timestamp bound when a group sequence and hash are reused', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const event = groupSentEvent();

        await dispatch(event, 'bridge');
        await dispatch({ ...event, time: RECEIPT.timestamp + 121 }, 'bridge');

        expect(emitEvent).toHaveBeenCalledTimes(2);
    });

    it('does not publish an event suppressed by the persistence recall check', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        // The event's cache operation is the final authority after asynchronous
        // conversion: a recall may have committed while media was resolving.
        const event = privateSentEvent();
        const original = OneBotInstance.prototype;
        const cache = vi
            .spyOn(
                original as unknown as {
                    cacheMessageEvent(event: JsonObject): Promise<boolean>;
                },
                'cacheMessageEvent',
            )
            .mockResolvedValueOnce(false);

        try {
            await dispatch(event, 'bridge');
            expect(emitEvent).not.toHaveBeenCalled();
        } finally {
            cache.mockRestore();
        }
    });

    it('reports upload_private_file as a private self-sent message', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const handler = new ApiHandler(buildApiContext(ctx));

        const response = await handler.handle('upload_private_file', {
            user_id: PEER_ID,
            file: 'base64://AQID',
            name: 'inline.txt',
        });

        expect(response).toMatchObject({
            status: 'ok',
            retcode: 0,
            data: { file_id: 'uploaded-file-uuid' },
        });
        expect(ctx.bridge.apis.groupFile.uploadPrivate).toHaveBeenCalledWith(
            PEER_ID,
            'base64://AQID',
            'inline.txt',
            true,
            false,
        );
        expect(ctx.bridge.apis.message.sendC2cFile).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                self_id: SELF_ID,
                user_id: SELF_ID,
                target_id: PEER_ID,
                message_seq: RECEIPT.clientSequence,
                message: [
                    {
                        type: 'file',
                        data: expect.objectContaining({
                            file_id: 'uploaded-file-uuid',
                            file: 'inline.txt',
                            file_size: 3,
                        }),
                    },
                ],
            }),
            'send',
        );
    });

    it('fails upload_private_file when publishing the private file fails', async () => {
        const { ctx, dispatchEvent } = makeContext();
        vi.mocked(ctx.bridge.apis.message.sendC2cFile).mockRejectedValueOnce(
            new Error('private file publication rejected'),
        );
        const handler = new ApiHandler(buildApiContext(ctx));

        const response = await handler.handle('upload_private_file', {
            user_id: PEER_ID,
            file: 'base64://AQID',
            name: 'inline.txt',
        });

        expect(response).toMatchObject({
            status: 'failed',
            retcode: 100,
            wording: 'private file publication rejected',
        });
        expect(dispatchEvent).not.toHaveBeenCalled();
    });

    it('does not report upload_private_file when upload_file is disabled', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const handler = new ApiHandler(buildApiContext(ctx));

        const response = await handler.handle('upload_private_file', {
            user_id: PEER_ID,
            file: 'base64://AQID',
            name: 'inline.txt',
            upload_file: false,
        });

        expect(response).toMatchObject({
            status: 'ok',
            retcode: 0,
            data: { file_id: 'uploaded-file-uuid' },
        });
        expect(ctx.bridge.apis.message.sendC2cFile).not.toHaveBeenCalled();
        expect(dispatchEvent).not.toHaveBeenCalled();
    });

    it('reports a private message sent through an action', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const api = buildApiContext(ctx);

        const result = await api.sendPrivateMessage(
            PEER_ID,
            [{ type: 'text', data: { text: 'hello' } }],
            false,
        );

        expect(result.messageId).not.toBe(0);
        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                sub_type: 'friend',
                self_id: SELF_ID,
                user_id: SELF_ID,
                target_id: PEER_ID,
                message_seq: RECEIPT.clientSequence,
            }),
            'send',
        );
    });

    it('reports storage failure without failing or repeating an already successful send', async () => {
        const { ctx, dispatchEvent, events } = makeContext();
        vi.spyOn(ctx.messageStore, 'storeEvent').mockImplementation(() => {
            throw new Error('disk full');
        });
        const handler = new ApiHandler(buildApiContext(ctx));
        const entries: LogEntry[] = [];
        const unsubscribe = subscribeLogs((entry) => entries.push(entry));

        try {
            const response = await handler.handle('send_private_msg', {
                user_id: PEER_ID,
                message: 'hello',
            });
            expect(response).toMatchObject({ status: 'ok', retcode: 0 });
            expect(ctx.bridge.apis.message.sendPrivate).toHaveBeenCalledOnce();
            expect(events.size).toBe(0);
            expect(dispatchEvent).not.toHaveBeenCalled();
            expect(entries).toContainEqual(
                expect.objectContaining({
                    level: 'warn',
                    message: expect.stringMatching(/failed to cache self-sent message.*disk full/),
                }),
            );
        } finally {
            unsubscribe();
        }
    });

    it('[#288] reports a private forward built through an action', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const api = buildApiContext(ctx);

        const result = await api.sendPrivateForwardMsg(PEER_ID, [
            {
                type: 'node',
                data: {
                    user_id: SELF_ID,
                    nickname: 'SnowLuma',
                    content: [{ type: 'text', data: { text: 'forwarded' } }],
                },
            },
        ]);

        expect(result.messageId).not.toBe(0);
        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                self_id: SELF_ID,
                user_id: SELF_ID,
                target_id: PEER_ID,
                message_seq: RECEIPT.clientSequence,
                message: [
                    expect.objectContaining({
                        type: 'forward',
                    }),
                ],
            }),
            'send',
        );
    });

    it('[#288] reports a cached message forwarded to a friend through an action', async () => {
        const { ctx, dispatchEvent, events } = makeContext();
        const sourceMessageId = 55;
        events.set(sourceMessageId, {
            message_id: sourceMessageId,
            message_type: 'private',
            user_id: PEER_ID,
            message: [{ type: 'text', data: { text: 'forward me' } }],
        });
        const api = buildApiContext(ctx);

        const result = await api.forwardSingleMsg(sourceMessageId, { userId: PEER_ID });

        expect(result.messageId).not.toBe(0);
        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                self_id: SELF_ID,
                user_id: SELF_ID,
                target_id: PEER_ID,
                message_seq: RECEIPT.clientSequence,
                message: [{ type: 'text', data: { text: 'forward me' } }],
            }),
            'send',
        );
    });

    it('[#288] does not report a private forward without a reliable sequence', async () => {
        const { ctx, dispatchEvent, events } = makeContext({ ...RECEIPT, sequence: 0 });
        const sourceMessageId = 56;
        events.set(sourceMessageId, {
            message_id: sourceMessageId,
            message_type: 'private',
            user_id: PEER_ID,
            message: [{ type: 'text', data: { text: 'forward me' } }],
        });
        const api = buildApiContext(ctx);

        await api.forwardSingleMsg(sourceMessageId, { userId: PEER_ID });

        expect(dispatchEvent).not.toHaveBeenCalled();
    });

    it('reports a private file sent through an action', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const api = buildApiContext(ctx);

        const result = await api.sendPrivateMessage(
            PEER_ID,
            [
                {
                    type: 'file',
                    data: {
                        file_id: 'file-uuid',
                        name: 'report.txt',
                        size: 128,
                        md5: '00112233445566778899aabbccddeeff',
                    },
                },
            ],
            false,
        );

        expect(result.messageId).not.toBe(0);
        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                self_id: SELF_ID,
                user_id: SELF_ID,
                target_id: PEER_ID,
                message: [
                    expect.objectContaining({
                        type: 'file',
                        data: expect.objectContaining({
                            file_id: 'file-uuid',
                            file: 'report.txt',
                            file_size: 128,
                        }),
                    }),
                ],
            }),
            'send',
        );
    });

    it('reports a private file uploaded and sent through an action', async () => {
        const { ctx, dispatchEvent } = makeContext();
        const api = buildApiContext(ctx);

        await api.sendPrivateMessage(
            PEER_ID,
            [
                {
                    type: 'file',
                    data: {
                        file: 'base64://AQID',
                        name: 'inline.txt',
                    },
                },
            ],
            false,
        );

        expect(dispatchEvent).toHaveBeenCalledOnce();
        expect(dispatchEvent).toHaveBeenCalledWith(
            expect.objectContaining({
                post_type: 'message_sent',
                message_type: 'private',
                target_id: PEER_ID,
                message: [
                    expect.objectContaining({
                        type: 'file',
                        data: expect.objectContaining({
                            file: 'inline.txt',
                            url: 'base64://AQID',
                        }),
                    }),
                ],
            }),
            'send',
        );
    });

    it('reports each QQ message produced by a mixed private action', async () => {
        const fileReceipt: Receipt = {
            messageId: 654321,
            sequence: 88,
            clientSequence: 10,
            random: 654321,
            timestamp: RECEIPT.timestamp + 1,
        };
        const { ctx, dispatchEvent } = makeContext([RECEIPT, fileReceipt]);
        const api = buildApiContext(ctx);

        const result = await api.sendPrivateMessage(
            PEER_ID,
            [
                { type: 'text', data: { text: 'attachment:' } },
                {
                    type: 'file',
                    data: {
                        file_id: 'mixed-file-uuid',
                        name: 'mixed.txt',
                        size: 64,
                        md5: '00112233445566778899aabbccddeeff',
                    },
                },
            ],
            false,
        );

        expect(dispatchEvent).toHaveBeenCalledTimes(2);
        expect(dispatchEvent.mock.calls[0]?.[0]).toMatchObject({
            post_type: 'message_sent',
            message_seq: RECEIPT.clientSequence,
            message: [{ type: 'text', data: { text: 'attachment:' } }],
        });
        expect(dispatchEvent.mock.calls[1]?.[0]).toMatchObject({
            post_type: 'message_sent',
            message_seq: fileReceipt.clientSequence,
            message: [
                {
                    type: 'file',
                    data: expect.objectContaining({ file_id: 'mixed-file-uuid' }),
                },
            ],
        });
        expect(result.messageId).toBe(
            hashMessageIdInt32(fileReceipt.sequence, PEER_ID, PRIVATE_NT_MESSAGE_EVENT),
        );
    });

    it('reports each file in a multi-file private action separately', async () => {
        const secondReceipt: Receipt = {
            messageId: 654321,
            sequence: 88,
            clientSequence: 10,
            random: 654321,
            timestamp: RECEIPT.timestamp + 1,
        };
        const { ctx, dispatchEvent } = makeContext([RECEIPT, secondReceipt]);
        const api = buildApiContext(ctx);

        await api.sendPrivateMessage(
            PEER_ID,
            [
                {
                    type: 'file',
                    data: {
                        file_id: 'first-file',
                        name: 'first.txt',
                        size: 1,
                        md5: '00112233445566778899aabbccddeeff',
                    },
                },
                {
                    type: 'file',
                    data: {
                        file_id: 'second-file',
                        name: 'second.txt',
                        size: 2,
                        md5: 'ffeeddccbbaa00998877665544332211',
                    },
                },
            ],
            false,
        );

        expect(dispatchEvent).toHaveBeenCalledTimes(2);
        expect(
            dispatchEvent.mock.calls.map(
                ([event]) => ((event.message as JsonObject[])[0]?.data as JsonObject)?.file_id,
            ),
        ).toEqual(['first-file', 'second-file']);
    });

    it('does not report a later QQ echo after the action event', async () => {
        const { dispatch, emitEvent, stored } = makeInstanceHarness();
        const sentEvent = privateSentEvent();
        const qqEcho: JsonObject = {
            ...sentEvent,
            raw_message: 'canonical echo',
            sender: { user_id: SELF_ID, nickname: 'Server profile' },
        };

        await dispatch(sentEvent, 'send');
        await dispatch(qqEcho, 'bridge');

        expect(emitEvent).toHaveBeenCalledOnce();
        expect(stored.get(987654)?.raw_message).toBe('canonical echo');
    });

    it('records one truthful handoff terminal for reporting, duplicate suppression, and status suppression', async () => {
        const previousLevel = getLogLevel();
        const entries: LogEntry[] = [];
        const unsubscribe = subscribeLogs((entry) => entries.push(entry));
        setLogLevel('trace');

        try {
            const logger = createLogger('Event').child({ uin: SELF_ID });
            const reporting = makeInstanceHarness({ logger });
            await runWithRequestId(6001, () => reporting.dispatch(privateSentEvent(), 'send'));
            expect(reporting.emitEvent).toHaveBeenCalledOnce();

            const duplicate = makeInstanceHarness({ logger });
            await runWithRequestId(6002, async () => {
                await duplicate.dispatch(privateSentEvent(), 'send');
                await duplicate.dispatch(privateSentEvent({ raw_message: 'canonical' }), 'bridge');
            });
            expect(duplicate.emitEvent).toHaveBeenCalledOnce();

            const status = makeInstanceHarness({
                logger,
                statusCommand: { enabled: true, swallow: true, cooldownSeconds: 5, trigger: '#sl' },
            });
            await runWithRequestId(6003, () =>
                status.dispatch(
                    privateSentEvent({
                        post_type: 'message',
                        user_id: PEER_ID,
                        target_id: undefined,
                        raw_message: '#sl',
                        message: [{ type: 'text', data: { text: '#sl' } }],
                    }),
                    'bridge',
                ),
            );
            expect(status.emitEvent).not.toHaveBeenCalled();

            const terminals = entries.filter(
                (entry) =>
                    entry.scope === 'Event' &&
                    entry.level === 'trace' &&
                    entry.message.startsWith('event_terminal'),
            );
            expect(terminals.filter((entry) => entry.req === 6001)).toHaveLength(1);
            expect(terminals.find((entry) => entry.req === 6001)?.message).toContain(
                'outcome=reporting_started',
            );
            expect(terminals.filter((entry) => entry.req === 6002)).toHaveLength(2);
            expect(
                terminals.find(
                    (entry) =>
                        entry.req === 6002 && entry.message.includes('reason=duplicate_self_echo'),
                )?.message,
            ).toContain('outcome=suppressed');
            expect(terminals.filter((entry) => entry.req === 6003)).toHaveLength(1);
            expect(terminals[terminals.length - 1]?.message).toContain(
                'outcome=suppressed reason=status_command',
            );
        } finally {
            unsubscribe();
            setLogLevel(previousLevel);
        }
    });

    it('does not dispatch an event for a receipt without a reliable sequence', async () => {
        const { ctx, dispatchEvent } = makeContext({ ...RECEIPT, sequence: 0 });
        const api = buildApiContext(ctx);

        await api.sendPrivateMessage(PEER_ID, [{ type: 'text', data: { text: 'hello' } }], false);

        expect(dispatchEvent).not.toHaveBeenCalled();
    });

    it('keeps an earlier QQ echo and does not report the later action event', async () => {
        const { ctx, dispatchEvent, events } = makeContext();
        const messageId = hashMessageIdInt32(RECEIPT.sequence, PEER_ID, PRIVATE_NT_MESSAGE_EVENT);
        const qqEcho: JsonObject = {
            time: RECEIPT.timestamp,
            self_id: SELF_ID,
            post_type: 'message_sent',
            message_type: 'private',
            sub_type: 'friend',
            message_id: messageId,
            message_seq: RECEIPT.clientSequence,
            user_id: SELF_ID,
            target_id: PEER_ID,
            message: [{ type: 'text', data: { text: 'hello' } }],
            raw_message: 'canonical echo',
            sender: { user_id: SELF_ID, nickname: 'Server profile' },
        };
        events.set(messageId, qqEcho);

        const api = buildApiContext(ctx);
        const result = await api.sendPrivateMessage(
            PEER_ID,
            [{ type: 'text', data: { text: 'hello' } }],
            false,
        );

        expect(result.messageId).toBe(messageId);
        expect(dispatchEvent).not.toHaveBeenCalled();
        expect(events.get(messageId)).toBe(qqEcho);
    });

    it('does not invent a friend event for a group temporary-session send', async () => {
        const groupId = 30003;
        const { ctx, dispatchEvent } = makeContext();
        ctx.tempSessions.record(PEER_ID, groupId);

        const api = buildApiContext(ctx);
        await api.sendPrivateMessage(
            PEER_ID,
            [{ type: 'text', data: { text: 'hello' } }],
            false,
            groupId,
        );

        expect(dispatchEvent).not.toHaveBeenCalled();
    });

    it('does not suppress a bridge echo that was cached but never reported', async () => {
        const { dispatch, emitEvent, stored } = makeInstanceHarness();
        const cached: JsonObject = {
            time: RECEIPT.timestamp,
            self_id: SELF_ID,
            post_type: 'message_sent',
            message_type: 'group',
            sub_type: 'normal',
            message_id: 7654321,
            message_seq: RECEIPT.sequence,
            group_id: 30003,
            user_id: SELF_ID,
            message: [],
            raw_message: '',
            sender: { user_id: SELF_ID },
        };
        stored.set(7654321, cached);

        await dispatch({ ...cached, raw_message: 'canonical echo' }, 'bridge');

        expect(emitEvent).toHaveBeenCalledOnce();
        expect(stored.get(7654321)?.raw_message).toBe('canonical echo');
    });

    it('does not suppress a hash collision from another conversation', async () => {
        const { dispatch, emitEvent } = makeInstanceHarness();
        const sentEvent = privateSentEvent();

        await dispatch(sentEvent, 'send');
        await dispatch({ ...sentEvent, target_id: PEER_ID + 1 }, 'bridge');

        expect(emitEvent).toHaveBeenCalledTimes(2);
    });
});