import { describe, it, expect, vi } from 'vitest';

vi.mock('@snowluma/protocol/bridge-oidb', () => ({
    makeOidbEnvelope: vi.fn((_oidbCmd, _subCmd, body) => ({ body })),
    encodeOidbEnv: vi.fn(() => new Uint8Array()),
    decodeOidbEnv: vi.fn(() => ({ body: {} })),
}));

// element-builder reaches into protoEncode with element-specific schemas
// that we don't want to construct manually in tests; stub it to return
// a benign placeholder.
vi.mock('@snowluma/protocol/element-builder', () => ({
    buildSendElems: vi.fn(async () => []),
}));

import { gunzipSync, gzipSync } from 'zlib';
import { protobuf_decode, protobuf_encode } from '@snowluma/proton';
import type {
    SendLongMsgReq,
    SendLongMsgResp,
    LongMsgResult,
    RecvLongMsgResp,
} from '@snowluma/proto-defs/longmsg';
import type { PushMsgBody } from '@snowluma/proto-defs/message';
import { ForwardApi } from '../../src/bridge/apis/forward';
import { mockBridge } from './_helpers';

/** Decode the SsoSendLongMsg packet body back into the per-node contentHead
 *  timestamps of the MultiMsg action — how #209's custom time is verified on
 *  the wire. */
function sentNodeTimestamps(body: Uint8Array): number[] {
    const req = protobuf_decode<SendLongMsgReq>(body);
    const payload = req.info?.payload;

    if (!payload) {
        return [];
    }

    const longMsg = protobuf_decode<LongMsgResult>(gunzipSync(Buffer.from(payload)));
    const main = longMsg.action?.find((a) => a?.actionCommand === 'MultiMsg');
    const bodies = Array.isArray(main?.actionData?.msgBody) ? main!.actionData!.msgBody : [];
    return bodies.map((b) => Number(b.contentHead?.timestamp ?? 0));
}

function uploadResponseWithResId(resId: string) {
    const encoded = protobuf_encode<SendLongMsgResp>({ result: { resId } });
    return {
        success: true,
        gotResponse: true,
        errorCode: 0,
        errorMessage: '',
        responseData: Buffer.from(encoded),
    };
}

/** Build an SsoRecvLongMsg response wrapping the given forward nodes. */
function recvLongMsgResp(bodies: PushMsgBody[]) {
    const longMsg: LongMsgResult = {
        action: [{ actionCommand: 'MultiMsg', actionData: { msgBody: bodies } }],
    };
    const gz = gzipSync(Buffer.from(protobuf_encode<LongMsgResult>(longMsg)));
    return recvCompressedLongMsgResp(gz);
}

function recvCompressedLongMsgResp(payload: Uint8Array) {
    const resp = protobuf_encode<RecvLongMsgResp>({ result: { payload } });
    return {
        success: true,
        gotResponse: true,
        errorCode: 0,
        errorMessage: '',
        responseData: Buffer.from(resp),
    };
}

describe('actions/forward', () => {
    it('uploadForwardNodes rejects empty arrays', async () => {
        const bridge = mockBridge();
        await expect(new ForwardApi(bridge as any).upload([])).rejects.toThrow(/required/);
    });

    it('uploadForwardNodes dispatches to SsoSendLongMsg with a non-empty body and returns the res_id', async () => {
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => uploadResponseWithResId('res-001')) as any,
        });

        const resId = await new ForwardApi(bridge as any).upload([
            { userUin: 10001, nickname: 'alice', elements: [] },
        ]);

        expect(resId).toBe('res-001');
        expect(bridge.sendRawPacket).toHaveBeenCalledOnce();
        const [serviceCmd, body] = bridge.sendRawPacket.mock.calls[0]!;
        expect(serviceCmd).toBe('trpc.group.long_msg_interface.MsgService.SsoSendLongMsg');
        expect((body as Uint8Array).length).toBeGreaterThan(0);
    });

    it('honours a custom per-node time on the wire, and defaults to now when absent (#209)', async () => {
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => uploadResponseWithResId('res-time')) as any,
        });

        const customTime = 1600000000; // 2020-09-13, clearly not "now"
        await new ForwardApi(bridge as any).upload([
            { userUin: 10001, nickname: 'alice', elements: [], time: customTime },
            { userUin: 10002, nickname: 'bob', elements: [] }, // no time → fallback
        ]);

        const [, body] = bridge.sendRawPacket.mock.calls[0]!;
        const [tsAlice, tsBob] = sentNodeTimestamps(body as Uint8Array);

        expect(tsAlice).toBe(customTime);
        // Bob falls back to the current time (seconds).
        expect(Math.abs(tsBob - Math.floor(Date.now() / 1000))).toBeLessThan(5);
    });

    it('uploadForwardNodes throws when sendRawPacket reports failure', async () => {
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => ({
                success: false,
                gotResponse: false,
                errorCode: -1,
                errorMessage: 'pipe broken',
                responseData: null,
            })) as any,
        });
        await expect(
            new ForwardApi(bridge as any).upload([{ userUin: 10001, nickname: 'a', elements: [] }]),
        ).rejects.toThrow(/pipe broken/);
    });

    it('uploadForwardNodes throws when the response is missing res_id', async () => {
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => uploadResponseWithResId('')) as any,
        });
        await expect(
            new ForwardApi(bridge as any).upload([{ userUin: 10001, nickname: 'a', elements: [] }]),
        ).rejects.toThrow(/missing res_id/);
    });

    it('cached fetch after upload keeps a usable image source (#441)', async () => {
        const sendRawPacket = vi.fn(async () => uploadResponseWithResId('res-img-cache')) as any;
        const bridge = mockBridge({ sendRawPacket });
        const source = 'https://cdn.example/bot-built.png';

        const resId = await new ForwardApi(bridge as any).upload([
            {
                userUin: 10001,
                nickname: 'alice',
                elements: [{ type: 'image', url: source }],
            },
        ]);
        const fetched = await new ForwardApi(bridge as any).fetch(resId);

        expect(fetched).toHaveLength(1);
        expect(fetched[0]!.elements[0]).toMatchObject({
            type: 'image',
            url: source,
            imageUrl: source,
        });
        expect(sendRawPacket).toHaveBeenCalledTimes(1);
    });

    it('fetchForwardNodes serves from cache after a successful upload (no second sendRawPacket)', async () => {
        const sendRawPacket = vi.fn(async () => uploadResponseWithResId('res-cache')) as any;
        const bridge = mockBridge({ sendRawPacket });

        const nodes = [
            { userUin: 10001, nickname: 'alice', elements: [] },
            { userUin: 10002, nickname: 'bob', elements: [] },
        ];

        const resId = await new ForwardApi(bridge as any).upload(nodes);
        expect(resId).toBe('res-cache');

        const fetched = await new ForwardApi(bridge as any).fetch('res-cache');
        // Same nicknames + uins; elements have been deep-copied so the shape
        // is preserved but the array reference is different.
        expect(fetched).toHaveLength(2);
        expect(fetched.map((n: { nickname: string }) => n.nickname)).toEqual(['alice', 'bob']);
        expect(sendRawPacket).toHaveBeenCalledTimes(1);
    });

    it('[#201] fills a group forward node nickname from grp.groupName when memberName is empty', async () => {
        // Real merged-forward nodes leave grp.memberName (field 2) null and carry the
        // sender display name in grp.memberCard (field 4). Verified on-target: fromUin
        // 1787882683 ↔ grp.memberCard "墨梓柒". Before the fix the node nickname came
        // back "" and enrichSenders 0x899-AUTHORITY_FAIL'd on the placeholder group.
        const node: PushMsgBody = {
            responseHead: {
                fromUin: 1787882683,
                fromUid: 'u_x',
                grp: { groupUin: 284840486, memberCard: Buffer.from('墨梓柒') },
            },
            contentHead: { msgType: 82, sequence: 1, timestamp: 100 }, // 82 = PkgType.GroupMessage
            body: { richText: { elems: [{ text: { str: 'hi' } }] } },
        };
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => recvLongMsgResp([node])) as any,
        });
        const nodes = await new ForwardApi(bridge as any).fetch('res-201');
        expect(nodes).toHaveLength(1);
        expect(nodes[0]!.userUin).toBe(1787882683);
        expect(nodes[0]!.nickname).toBe('墨梓柒'); // was '' before the fix
        expect(nodes[0]!.groupId).toBe(284840486);
        // The nickname is present, so no group-member-list enrichment fetch fires.
        expect(bridge.sendRawPacket).toHaveBeenCalledTimes(1);
    });

    it('fetchForwardNodes throws on transport failure when nothing is cached', async () => {
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => ({
                success: false,
                gotResponse: false,
                errorCode: -1,
                errorMessage: 'down',
                responseData: null,
            })) as any,
        });
        await expect(new ForwardApi(bridge as any).fetch('cold-cache-miss')).rejects.toThrow(
            /download forward message failed|down/,
        );
    });

    it('bounds long-message gunzip output and reports decompression context', async () => {
        // This is one byte beyond the production 32 MiB ceiling but compresses to
        // a small response, modelling an otherwise cheap gzip bomb from QQ.
        const expandedBytes = 32 * 1024 * 1024 + 1;
        const payload = gzipSync(Buffer.alloc(expandedBytes, 0x61));
        const resId = 'oversized-compressed-forward';
        const bridge = mockBridge({
            sendRawPacket: vi.fn(async () => recvCompressedLongMsgResp(payload)) as any,
        });

        await expect(new ForwardApi(bridge as any).fetch(resId)).rejects.toThrow(
            /download forward message decompression failed .*res_id=oversized-compressed-forward.*max_output_bytes=33554432/,
        );
    });

    it('uploadForwardNodes recursively uploads nested innerForward chains (NapCat piggyback model)', async () => {
        // Regression: nested forward needs the inner chain to be uploaded
        // first (so we have its res_id for the outer ARK preview), AND
        // the inner level's msgBody to be carried up to the outermost
        // long-msg upload as an extra `actionCommand` slot keyed on a
        // uuid. Matches `dev/NapCatQQ/.../SendMsg.uploadForwardedNodesPacket`
        // — the receiver gets the whole tree from a single fetch instead
        // of resolving each layer's res_id separately.
        const responses = ['inner-res', 'outer-res'];
        const sendRawPacket = vi.fn(async () => uploadResponseWithResId(responses.shift()!)) as any;
        const bridge = mockBridge({ sendRawPacket });

        const resId = await new ForwardApi(bridge as any).upload([
            {
                userUin: 111,
                nickname: 'outer',
                elements: [],
                innerForward: [
                    { userUin: 222, nickname: 'inner', elements: [{ type: 'text', text: 'hi' }] },
                ],
            },
        ]);

        // Two server roundtrips: one for the inner chain, then one for
        // the outer (which piggybacks the inner msgBody onto its actions
        // array). The outer res_id is what the caller gets back.
        expect(resId).toBe('outer-res');
        expect(sendRawPacket).toHaveBeenCalledTimes(2);
    });

    it('uploadForwardNodes leaves flat (non-nested) sends at a single roundtrip', async () => {
        // Backwards-compat: the common case (no inner forward) must still
        // be one SsoSendLongMsg call. Without this we'd double upload
        // every regular forward send.
        const sendRawPacket = vi.fn(async () => uploadResponseWithResId('flat-res')) as any;
        const bridge = mockBridge({ sendRawPacket });

        const resId = await new ForwardApi(bridge as any).upload([
            { userUin: 10001, nickname: 'a', elements: [{ type: 'text', text: 'hello' }] },
            { userUin: 10002, nickname: 'b', elements: [{ type: 'text', text: 'world' }] },
        ]);

        expect(resId).toBe('flat-res');
        expect(sendRawPacket).toHaveBeenCalledOnce();
    });
});

describe('actions/forward — sender name enrichment (#174)', () => {
    function apiWith(contacts: { fetchGroupMemberList: any; fetchUserProfile: any }) {
        return new ForwardApi({ apis: { contacts } } as any);
    }

    it('fills empty / "QQ用户" names via the group member list (L3), card preferred', async () => {
        const fetchGroupMemberList = vi.fn(async () => [
            { uin: 10001, nickname: 'AliceNick', card: 'AliceCard' },
            { uin: 10002, nickname: 'BobNick', card: '' },
        ]);
        const fetchUserProfile = vi.fn(async (uin: number) => ({ uin, nickname: 'Stranger' }));
        const api = apiWith({ fetchGroupMemberList, fetchUserProfile });

        const nodes: any[] = [
            { userUin: 10001, nickname: '', groupId: 700, messageType: 'group', elements: [] },
            {
                userUin: 10002,
                nickname: 'QQ用户',
                groupId: 700,
                messageType: 'group',
                elements: [],
            },
            { userUin: 10003, nickname: '', groupId: 700, messageType: 'group', elements: [] }, // not in list
            { userUin: 10009, nickname: '', messageType: 'private', elements: [] }, // private
            {
                userUin: 10005,
                nickname: 'KeepMe',
                groupId: 700,
                messageType: 'group',
                elements: [],
            },
        ];
        const changed = await (api as any).enrichSenders(nodes);

        expect(changed).toBe(true);
        expect(nodes[0].nickname).toBe('AliceCard'); // card preferred over nick
        expect(nodes[0].senderCard).toBe('AliceCard');
        expect(nodes[1].nickname).toBe('BobNick'); // card empty → nickname
        expect(nodes[2].nickname).toBe('Stranger'); // not in member list → L4 profile
        expect(nodes[3].nickname).toBe('Stranger'); // private node → L4 profile
        expect(nodes[4].nickname).toBe('KeepMe'); // already named → untouched
        expect(fetchGroupMemberList).toHaveBeenCalledTimes(1); // one fetch covers the whole group
    });

    it('is a no-op (no fetch) when every node already has a name', async () => {
        const fetchGroupMemberList = vi.fn();
        const fetchUserProfile = vi.fn();
        const api = apiWith({ fetchGroupMemberList, fetchUserProfile });
        const nodes: any[] = [
            { userUin: 1, nickname: 'has-name', groupId: 7, messageType: 'group', elements: [] },
        ];
        expect(await (api as any).enrichSenders(nodes)).toBe(false);
        expect(fetchGroupMemberList).not.toHaveBeenCalled();
    });

    it('keeps the placeholder and never throws when resolution fails', async () => {
        const api = apiWith({
            fetchGroupMemberList: vi.fn(async () => {
                throw new Error('net down');
            }),
            fetchUserProfile: vi.fn(async () => {
                throw new Error('net down');
            }),
        });
        const nodes: any[] = [
            {
                userUin: 10001,
                nickname: 'QQ用户',
                groupId: 700,
                messageType: 'group',
                elements: [],
            },
        ];
        await expect((api as any).enrichSenders(nodes)).resolves.toBe(false);
        expect(nodes[0].nickname).toBe('QQ用户');
    });

    it('does NOT fan a member-list failure out to per-uin profile lookups (rate-limit guard)', async () => {
        const fetchUserProfile = vi.fn(async (uin: number) => ({ uin, nickname: 'X' }));
        const api = apiWith({
            fetchGroupMemberList: vi.fn(async () => {
                throw new Error('net');
            }),
            fetchUserProfile,
        });
        // 5 distinct group senders whose member list errors → must keep placeholder,
        // NOT trigger 5 profile calls.
        const nodes: any[] = Array.from({ length: 5 }, (_, i) => ({
            userUin: 20000 + i,
            nickname: '',
            groupId: 700,
            messageType: 'group',
            elements: [],
        }));
        expect(await (api as any).enrichSenders(nodes)).toBe(false);
        expect(fetchUserProfile).not.toHaveBeenCalled();
        expect(nodes.every((n) => n.nickname === '')).toBe(true);
    });
});