import { describe, expect, it, vi } from 'vitest';
import { BridgeEventBus } from '@snowluma/protocol/event-bus';
import type { GroupRequestInfo } from '@snowluma/protocol/qq-info';
import type { BridgeInterface } from '../../src/bridge/bridge-interface';
import { GroupRequestPoller } from '../src/group-request-poller';

function request(overrides: Partial<GroupRequestInfo> = {}): GroupRequestInfo {
    return {
        groupId: 999,
        groupName: 'group',
        targetUid: 'target_uid',
        targetUin: 123,
        targetName: 'requester',
        invitorUid: 'inviter_uid',
        invitorUin: 456,
        invitorName: 'inviter',
        operatorUid: '',
        operatorUin: 0,
        operatorName: '',
        sequence: 42,
        state: 1,
        notifyType: 7,
        eventType: 1,
        comment: 'please',
        filtered: false,
        ...overrides,
    };
}

function setup(
    fetchGroupRequests: (filtered: boolean, count: number) => Promise<GroupRequestInfo[]>,
    getGroupInviteCardSequence?: (groupId: number) => number | undefined,
) {
    const events = new BridgeEventBus({
        onError: (_kind, error) => {
            throw error;
        },
    });
    const bridge = {
        events,
        apis: { contacts: { fetchGroupRequests, getGroupInviteCardSequence } },
    } as unknown as BridgeInterface;
    const poller = new GroupRequestPoller(bridge, 10_001, { intervalMs: 60_000 });
    return { events, poller };
}

describe('GroupRequestPoller', () => {
    it('emits a canonical invite request from a pending list-only notification once', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered
                ? []
                : [
                      request({
                          notifyType: 1,
                          eventType: 2,
                      }),
                  ],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();
        await poller.pollOnce();

        expect(fetchGroupRequests).toHaveBeenCalledWith(false, 50);
        expect(fetchGroupRequests).toHaveBeenCalledWith(true, 50);
        expect(received).toEqual([
            expect.objectContaining({
                kind: 'group_invite',
                selfUin: 10_001,
                groupId: 999,
                fromUin: 456,
                fromUid: 'inviter_uid',
                invitedUin: 123,
                invitedUid: 'target_uid',
                subType: 'invite',
                message: 'please',
                flag: 'slreq:1:42:999:2:0',
            }),
        ]);
    });

    it('uses the applicant identity and filtered handle for join applications', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered ? [request({ filtered: true, sequence: 43 })] : [],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();

        expect(received).toEqual([
            expect.objectContaining({
                fromUin: 123,
                fromUid: 'target_uid',
                subType: 'add',
                flag: 'slreq:1:43:999:1:1',
            }),
        ]);
    });

    it('emits an actionable invite when the sender account is unavailable and continues the batch', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered
                ? []
                : [
                      request({
                          notifyType: 1,
                          eventType: 2,
                          sequence: 41,
                          invitorUid: '',
                          invitorUin: 0,
                      }),
                      request({
                          groupId: 1_000,
                          notifyType: 1,
                          eventType: 2,
                          sequence: 42,
                      }),
                  ],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();
        await poller.pollOnce();

        expect(received).toEqual([
            expect.objectContaining({
                groupId: 999,
                fromUin: 0,
                fromUid: '',
                subType: 'invite',
                flag: 'slreq:1:41:999:2:0',
            }),
            expect.objectContaining({
                groupId: 1_000,
                fromUin: 456,
                flag: 'slreq:1:42:1000:2:0',
            }),
        ]);
    });

    it('does not merge separate requests whose sender identities are both unavailable', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered
                ? []
                : [
                      request({
                          notifyType: 1,
                          eventType: 2,
                          sequence: 41,
                          invitorUid: '',
                          invitorUin: 0,
                      }),
                      request({
                          notifyType: 1,
                          eventType: 2,
                          sequence: 42,
                          invitorUid: '',
                          invitorUin: 0,
                      }),
                  ],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();

        expect(received).toEqual([
            expect.objectContaining({ flag: 'slreq:1:41:999:2:0' }),
            expect.objectContaining({ flag: 'slreq:1:42:999:2:0' }),
        ]);
    });

    it('isolates a malformed list record without suppressing valid siblings', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered ? [] : [request({ sequence: 0 }), request({ groupId: 1_000, sequence: 43 })],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();

        expect(received).toEqual([
            expect.objectContaining({
                groupId: 1_000,
                flag: 'slreq:1:43:1000:1:0',
            }),
        ]);
    });

    it('preserves the private invite-card approval sequence when one is known', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered
                ? []
                : [
                      request({
                          notifyType: 1,
                          eventType: 2,
                          sequence: 42,
                      }),
                  ],
        );
        const { events, poller } = setup(fetchGroupRequests, () => 778_899);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        await poller.pollOnce();

        expect(received).toEqual([
            expect.objectContaining({
                flag: 'slreq:1:778899:999:2:0',
            }),
        ]);
    });

    it('does not emit processed or non-request notification types', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) =>
            filtered
                ? []
                : [
                      request({ sequence: 1, state: 2 }),
                      request({ sequence: 2, notifyType: 9, eventType: 6 }),
                  ],
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received = vi.fn();
        events.on('group_invite', received);

        await poller.pollOnce();

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

    it('fails the scan when either inbox cannot be read', async () => {
        const fetchGroupRequests = vi.fn(async (filtered: boolean) => {
            if (filtered) {
                throw new Error('filtered inbox unavailable');
            }

            return [request()];
        });
        const { events, poller } = setup(fetchGroupRequests);
        const received = vi.fn();
        events.on('group_invite', received);

        await expect(poller.pollOnce()).rejects.toThrow('filtered inbox unavailable');
        expect(received).not.toHaveBeenCalled();
    });

    it('does not duplicate a request already delivered by the real-time path', async () => {
        let releaseMain!: (value: GroupRequestInfo[]) => void;
        const main = new Promise<GroupRequestInfo[]>((resolve) => {
            releaseMain = resolve;
        });
        const fetchGroupRequests = vi.fn((filtered: boolean) =>
            filtered ? Promise.resolve([]) : main,
        );
        const { events, poller } = setup(fetchGroupRequests);
        const received: unknown[] = [];
        events.on('group_invite', (event) => {
            received.push(event);
        });

        poller.start();
        await events.emit({
            kind: 'group_invite',
            time: 1,
            selfUin: 10_001,
            groupId: 999,
            fromUin: 456,
            fromUid: 'inviter_uid',
            subType: 'invite',
            message: 'please',
            flag: 'invite:999:inviter_uid',
        });
        releaseMain([request({ notifyType: 1, eventType: 2 })]);
        await poller.stop();

        expect(received).toHaveLength(1);
    });

    it('shares concurrent scans instead of issuing overlapping requests', async () => {
        let release!: (value: GroupRequestInfo[]) => void;
        const pending = new Promise<GroupRequestInfo[]>((resolve) => {
            release = resolve;
        });
        const fetchGroupRequests = vi.fn(() => pending);
        const { poller } = setup(fetchGroupRequests);

        const first = poller.pollOnce();
        const second = poller.pollOnce();
        expect(second).toBe(first);
        expect(fetchGroupRequests).toHaveBeenCalledTimes(2);

        release([]);
        await first;
    });

    it('does not emit from an in-flight scheduled scan after shutdown starts', async () => {
        let release!: (value: GroupRequestInfo[]) => void;
        const pending = new Promise<GroupRequestInfo[]>((resolve) => {
            release = resolve;
        });
        const fetchGroupRequests = vi.fn(() => pending);
        const { events, poller } = setup(fetchGroupRequests);
        const received = vi.fn();
        events.on('group_invite', received);

        poller.start();
        const stopped = poller.stop();
        release([request()]);
        await stopped;

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