import { getLogLevel, setLogLevel, subscribeLogs, type LogEntry } from '@snowluma/common/logger';
import type { PacketInfo } from '@snowluma/common/protocol-types';
import { BridgeEventBus } from '@snowluma/protocol/event-bus';
import type { QQEventVariant } from '@snowluma/protocol/events';
import { IdentityService } from '@snowluma/protocol/identity-service';
import { GroupInviteTracker } from '@snowluma/protocol/group-invite-tracker';
import { IncomingPacketPipeline } from '@snowluma/protocol/packet-pipeline';
import type { GroupMemberInfo, QQGroupInfo, UserProfileInfo } from '@snowluma/protocol/qq-info';
import { afterEach, describe, expect, it, vi } from 'vitest';

const SELF_UIN = 10001;
const GROUP_ID = 123456789;
const previousLogLevel = getLogLevel();

afterEach(() => {
    setLogLevel(previousLogLevel);
});

function makeProfile(uin: number, uid = ''): UserProfileInfo {
    return {
        uin,
        uid,
        nickname: '',
        remark: '',
        qid: '',
        sex: 'unknown',
        age: 0,
        sign: '',
        avatar: '',
        level: 0,
        qidianMasterFlag: 0,
        qidianCrewFlag: 0,
        qidianCrewFlag2: 0,
    };
}

function makeMember(uin: number, uid: string): GroupMemberInfo {
    return {
        uin,
        uid,
        nickname: '',
        card: '',
        isRobot: false,
        role: 'member',
        level: 0,
        title: '',
        joinTime: 0,
        lastSentTime: 0,
        shutUpTime: 0,
    };
}

function makeGroup(): QQGroupInfo {
    return {
        groupId: GROUP_ID,
        groupName: 'g',
        remark: '',
        memberCount: 1,
        memberMax: 500,
        members: new Map([[22222, makeMember(22222, 'u_member')]]),
    };
}

function pkt(): PacketInfo {
    return {
        pid: 1,
        uin: String(SELF_UIN),
        serviceCmd: 'test.roster',
        seqId: 1,
        retCode: 0,
        fromClient: false,
        body: new Uint8Array(),
    };
}

function join(
    over: Partial<Extract<QQEventVariant, { kind: 'group_member_join' }>> = {},
): QQEventVariant {
    return {
        kind: 'group_member_join',
        time: 1,
        selfUin: SELF_UIN,
        groupId: GROUP_ID,
        userUin: 22222,
        operatorUin: 0,
        userUid: 'u_member',
        operatorUid: 'u_op',
        ...over,
    };
}

function leave(): QQEventVariant {
    return {
        kind: 'group_member_leave',
        time: 1,
        selfUin: SELF_UIN,
        groupId: GROUP_ID,
        userUin: 22222,
        operatorUin: 0,
        userUid: 'u_member',
        operatorUid: 'u_op',
        leaveType: 'leave',
    };
}

function admin(): QQEventVariant {
    return {
        kind: 'group_admin',
        time: 1,
        selfUin: SELF_UIN,
        groupId: GROUP_ID,
        userUin: 22222,
        set: true,
    };
}

function makePipeline(
    opts: {
        plantGroup?: boolean;
        plantGroupOnListFetch?: boolean;
        fetchGroupList?: () => Promise<void>;
        fetchGroupMemberList?: (groupId: number) => Promise<void>;
        fetchProfileByUid?: () => Promise<UserProfileInfo>;
    } = {},
) {
    const identity = IdentityService.memory(String(SELF_UIN));

    if (opts.plantGroup) {
        identity.rememberGroups([makeGroup()]);
    }

    if (opts.fetchProfileByUid) {
        identity.setFetcher({
            fetchProfile: async () => makeProfile(0),
            fetchProfileByUid: opts.fetchProfileByUid,
        });
    }

    const fetchGroupList =
        opts.fetchGroupList ??
        vi.fn(async () => {
            if (opts.plantGroupOnListFetch) {
                identity.rememberGroups([makeGroup()]);
            }
        });
    const fetchGroupMemberList = opts.fetchGroupMemberList ?? vi.fn(async () => {});
    const events = new BridgeEventBus();
    const captured: QQEventVariant[] = [];
    events.onAny((event) => {
        captured.push(event as QQEventVariant);
    });
    const pipeline = new IncomingPacketPipeline({
        identity,
        events,
        fetchGroupList,
        fetchGroupMemberList,
        resolveGroupJoinRequest: vi.fn(async () => null),
        groupInvites: new GroupInviteTracker(),
    });
    return { identity, pipeline, captured, fetchGroupList, fetchGroupMemberList };
}

async function afterSideEffect(): Promise<void> {
    await Promise.resolve();
    await Promise.resolve();
    await Promise.resolve();
}

describe('IncomingPacketPipeline roster refresh', () => {
    it('unknown-group join fetches the group list and skips members when still unknown', async () => {
        const { pipeline, fetchGroupList, fetchGroupMemberList } = makePipeline();
        pipeline.registerCmd('test.roster', () => [join()]);
        await pipeline.process(pkt());
        await afterSideEffect();
        expect(fetchGroupList).toHaveBeenCalledOnce();
        expect(fetchGroupMemberList).not.toHaveBeenCalled();
    });

    it('swallows fetchGroupList failure and still skips members when the group is unknown', async () => {
        const fetchGroupList = vi.fn(async () => {
            throw new Error('list down');
        });
        const { pipeline, captured, fetchGroupMemberList } = makePipeline({ fetchGroupList });
        pipeline.registerCmd('test.roster', () => [join()]);
        await pipeline.process(pkt());
        await afterSideEffect();
        expect(fetchGroupList).toHaveBeenCalledOnce();
        expect(fetchGroupMemberList).not.toHaveBeenCalled();
        expect(captured).toHaveLength(1);
    });

    it('fetches members after an unknown-group join if the list fetch plants the group', async () => {
        const { pipeline, fetchGroupList, fetchGroupMemberList } = makePipeline({
            plantGroupOnListFetch: true,
        });
        pipeline.registerCmd('test.roster', () => [join()]);
        await pipeline.process(pkt());
        await afterSideEffect();
        expect(fetchGroupList).toHaveBeenCalledOnce();
        expect(fetchGroupMemberList).toHaveBeenCalledWith(GROUP_ID);
    });

    it('known-group join records the joiner immediately and does not invent the operator', async () => {
        const { pipeline, identity, fetchGroupList, fetchGroupMemberList } = makePipeline({
            plantGroup: true,
        });
        pipeline.registerCmd('test.roster', () => [
            join({ userUin: 33333, userUid: 'u_new', operatorUin: 44444, operatorUid: 'u_op' }),
        ]);
        await pipeline.process(pkt());

        expect(identity.findGroupMember(GROUP_ID, 33333)?.uid).toBe('u_new');
        expect(identity.findGroupMember(GROUP_ID, 33333)?.isRobot).toBeUndefined();
        expect(identity.findGroupMember(GROUP_ID, 44444)).toBeNull();
        expect(identity.findUinByUid('u_op')).toBe(44444);
        expect(fetchGroupList).not.toHaveBeenCalled();
        expect(fetchGroupMemberList).toHaveBeenCalledWith(GROUP_ID);
    });

    it('known-group leave drops the member immediately and keeps their identity mapping', async () => {
        const { pipeline, identity } = makePipeline({ plantGroup: true });
        identity.rememberGroupMembers(GROUP_ID, [makeMember(22222, 'u_member')]);
        pipeline.registerCmd('test.roster', () => [leave()]);
        await pipeline.process(pkt());

        expect(identity.findGroupMember(GROUP_ID, 22222)).toBeNull();
        expect(identity.findUidByUin(22222, GROUP_ID)).toBe('u_member');
    });

    it('known-group join / leave / admin fetch only the member list', async () => {
        for (const event of [join(), leave(), admin()]) {
            const { pipeline, fetchGroupList, fetchGroupMemberList } = makePipeline({
                plantGroup: true,
            });
            pipeline.registerCmd('test.roster', () => [event]);
            await pipeline.process(pkt());
            await afterSideEffect();
            expect(fetchGroupList).not.toHaveBeenCalled();
            expect(fetchGroupMemberList).toHaveBeenCalledWith(GROUP_ID);
        }
    });

    it('self-join of a known group fetches both the group list and the member list', async () => {
        const { pipeline, fetchGroupList, fetchGroupMemberList } = makePipeline({
            plantGroup: true,
        });
        pipeline.registerCmd('test.roster', () => [join({ userUin: SELF_UIN, userUid: 'u_self' })]);
        await pipeline.process(pkt());
        await afterSideEffect();
        expect(fetchGroupList).toHaveBeenCalledOnce();
        expect(fetchGroupMemberList).toHaveBeenCalledWith(GROUP_ID);
    });

    it('unknown-group leave / admin do not fetch the group list or members', async () => {
        for (const event of [leave(), admin()]) {
            const { pipeline, fetchGroupList, fetchGroupMemberList } = makePipeline();
            pipeline.registerCmd('test.roster', () => [event]);
            await pipeline.process(pkt());
            await afterSideEffect();
            expect(fetchGroupList).not.toHaveBeenCalled();
            expect(fetchGroupMemberList).not.toHaveBeenCalled();
        }
    });

    it('warns when the member list fails and still emits the event', async () => {
        const entries: LogEntry[] = [];
        setLogLevel('warn');
        const unsubscribe = subscribeLogs((entry) => entries.push(entry));

        try {
            const { pipeline, captured } = makePipeline({
                plantGroup: true,
                fetchGroupMemberList: vi.fn(async () => {
                    throw new Error('net down');
                }),
            });
            pipeline.registerCmd('test.roster', () => [leave()]);
            await pipeline.process(pkt());
            expect(captured).toHaveLength(1);
            await afterSideEffect();
            expect(
                entries.some(
                    (entry) =>
                        entry.level === 'warn' &&
                        String(entry.message).includes('failed to refresh member cache'),
                ),
            ).toBe(true);
        } finally {
            unsubscribe();
        }
    });

    it('resolves an unresolved join UIN through Identity, not the roster ports', async () => {
        const fetchProfileByUid = vi.fn(async () => makeProfile(22222, 'u_new'));
        const { pipeline, captured, fetchGroupList, fetchGroupMemberList } = makePipeline({
            plantGroup: true,
            fetchProfileByUid,
        });
        pipeline.registerCmd('test.roster', () => [join({ userUin: 0, userUid: 'u_new' })]);
        await pipeline.process(pkt());
        expect(captured).toHaveLength(1);
        expect(
            (captured[0] as Extract<QQEventVariant, { kind: 'group_member_join' }>).userUin,
        ).toBe(22222);
        expect(fetchProfileByUid).toHaveBeenCalledWith('u_new');
        await afterSideEffect();
        expect(fetchGroupList).not.toHaveBeenCalled();
        expect(fetchGroupMemberList).toHaveBeenCalledWith(GROUP_ID);
    });

    it('coalesces concurrent refreshes for the same group', async () => {
        const { pipeline, fetchGroupMemberList } = makePipeline({ plantGroup: true });
        pipeline.registerCmd('test.roster', () => [leave(), admin()]);
        await pipeline.process(pkt());
        await afterSideEffect();
        expect(fetchGroupMemberList).toHaveBeenCalledOnce();
    });
});