import { beforeEach, describe, expect, it, vi } from 'vitest';
import type {
    SsoReadedReportReq,
    SsoReadedReportResp,
} from '@snowluma/proto-defs/oidb-actions/base';
import { protobuf_decode, protobuf_encode } from '@snowluma/proton';

const { fetchGroupMessageRange, fetchC2cMessageRange, fetchC2cRoamMessagePage } = vi.hoisted(
    () => ({
        fetchGroupMessageRange: vi.fn(),
        fetchC2cMessageRange: vi.fn(),
        fetchC2cRoamMessagePage: vi.fn(),
    }),
);

vi.mock('@snowluma/protocol/msg-push', () => ({
    fetchGroupMessageRange,
    fetchC2cMessageRange,
    fetchC2cRoamMessagePage,
}));

vi.mock('../src/bridge/apis/history-request-gate', () => ({
    HistoryRequestGate: class {
        run<T>(_gap: number, operation: () => Promise<T>): Promise<T> {
            return operation();
        }
    },
}));

import { LOGIN_HISTORY_SYNC_PROTOCOL_LIMITS, MessageApi } from '../src/bridge/apis/message';
import { mockBridge } from './actions/_helpers';

function readReportResult(response: SsoReadedReportResp) {
    return {
        success: true,
        gotResponse: true,
        errorCode: 0,
        errorMessage: '',
        responseData: Buffer.from(protobuf_encode<SsoReadedReportResp>(response)),
    };
}

describe('MessageApi login history sync seam', () => {
    beforeEach(() => {
        fetchGroupMessageRange.mockReset();
        fetchC2cMessageRange.mockReset();
        fetchC2cRoamMessagePage.mockReset();
    });

    it('probes server cursors once without sending a read confirmation', async () => {
        const sendRawPacket = vi.fn(async (_serviceCmd: string, _body: Uint8Array) =>
            readReportResult({
                groupList: [
                    {
                        groupUin: 12345n,
                        readSeq: 90n,
                        latestSeq: 120n,
                    },
                ],
                c2cList: [
                    {
                        targetUin: 54321n,
                        uid: 'u_friend',
                        readSeq: 70n,
                        latestSeq: 80n,
                        lastMsgTime: 1_700_000_000n,
                    },
                ],
            }),
        );
        const bridge = mockBridge({ sendRawPacket });

        const state = await new MessageApi(bridge as any).probeHistorySyncState(
            [12345],
            [{ userId: 54321, uid: 'u_friend' }],
        );

        expect(state).toEqual({
            groups: [{ groupId: 12345, readSeq: 90, latestSeq: 120 }],
            privateUsers: [
                {
                    userId: 54321,
                    uid: 'u_friend',
                    readSeq: 70,
                    latestSeq: 80,
                    lastMsgTime: 1_700_000_000,
                },
            ],
        });
        expect(sendRawPacket).toHaveBeenCalledOnce();
        expect(sendRawPacket.mock.calls[0]![0]).toBe('trpc.msg.msg_svc.MsgService.SsoReadedReport');
        const request = protobuf_decode<SsoReadedReportReq>(sendRawPacket.mock.calls[0]![1]);
        expect(request).toEqual({
            groupList: [{ groupUin: 12345n, lastReadSeq: null }],
            c2cList: [{ uid: 'u_friend', lastReadTime: null, lastReadSeq: null }],
        });
    });

    it('rejects an oversized probe before sending a packet', async () => {
        const bridge = mockBridge();
        const groups = Array.from(
            { length: LOGIN_HISTORY_SYNC_PROTOCOL_LIMITS.maxTargetsPerKind + 1 },
            (_, index) => 10_000 + index,
        );

        await expect(
            new MessageApi(bridge as any).probeHistorySyncState(groups, []),
        ).rejects.toThrow(/at most 100 group targets/);

        expect(bridge.sendRawPacket).not.toHaveBeenCalled();
    });

    it('keeps explicit read-report failures observable', async () => {
        const sendRawPacket = vi.fn(async () =>
            readReportResult({
                groupList: [
                    {
                        resultCode: 42,
                        errorMessage: 'probe rejected',
                        groupUin: 12345n,
                    },
                ],
            }),
        );
        const bridge = mockBridge({ sendRawPacket });

        await expect(
            new MessageApi(bridge as any).probeHistorySyncState([12345], []),
        ).rejects.toThrow('probe rejected');

        expect(sendRawPacket).toHaveBeenCalledOnce();
    });

    it('fetches at most one bounded group history page', async () => {
        fetchGroupMessageRange.mockResolvedValue([
            { kind: 'group_message', msgSeq: 101 },
            { kind: 'group_message', msgSeq: 102 },
        ]);
        const bridge = mockBridge();

        const result = await new MessageApi(bridge as any).getGroupHistorySyncPage(
            12345,
            101,
            120,
            10001,
        );

        expect(fetchGroupMessageRange).toHaveBeenCalledOnce();
        expect(fetchGroupMessageRange).toHaveBeenCalledWith(
            bridge,
            bridge.identity,
            10001,
            12345,
            101,
            120,
        );
        expect(result.map((message: { msgSeq: number }) => message.msgSeq)).toEqual([101, 102]);

        await expect(
            new MessageApi(bridge as any).getGroupHistorySyncPage(12345, 1, 21, 10001),
        ).rejects.toThrow(/at most 20 sequence slots/);
        expect(fetchGroupMessageRange).toHaveBeenCalledOnce();
    });

    it('fetches at most one bounded private roam page', async () => {
        fetchC2cRoamMessagePage.mockResolvedValue({
            messages: [
                { kind: 'friend_message', ntMsgSeq: 10, time: 100 },
                { kind: 'friend_message', ntMsgSeq: 11, time: 101 },
            ],
            cursor: { time: 99, random: 1 },
        });
        const bridge = mockBridge();

        const result = await new MessageApi(bridge as any).getC2cLatestHistorySyncPage(
            'u_friend',
            20,
            10001,
            1_700_000_001,
        );

        expect(fetchC2cRoamMessagePage).toHaveBeenCalledOnce();
        expect(fetchC2cRoamMessagePage).toHaveBeenCalledWith(
            bridge,
            bridge.identity,
            10001,
            'u_friend',
            1_700_000_001,
            20,
            0,
        );
        expect(result).toHaveLength(2);

        await expect(
            new MessageApi(bridge as any).getC2cLatestHistorySyncPage('u_friend', 21, 10001),
        ).rejects.toThrow(/at most 20 messages/);
        expect(fetchC2cRoamMessagePage).toHaveBeenCalledOnce();
    });

    it('fetches one bounded private sequence page without pagination', async () => {
        fetchC2cMessageRange.mockResolvedValue([
            { kind: 'friend_message', ntMsgSeq: 201 },
            { kind: 'friend_message', ntMsgSeq: 202 },
        ]);
        const bridge = mockBridge();

        const result = await new MessageApi(bridge as any).getC2cHistorySyncPage(
            'u_friend',
            201,
            220,
            10001,
        );

        expect(fetchC2cMessageRange).toHaveBeenCalledOnce();
        expect(fetchC2cMessageRange).toHaveBeenCalledWith(
            bridge,
            bridge.identity,
            10001,
            'u_friend',
            201,
            220,
        );
        expect(result.map((message) => message.ntMsgSeq ?? 0)).toEqual([201, 202]);
    });
});