const events = require('./lib/events.js');
const event_fixtures = events.fixtures;
const test_user = events.test_user;

const noop = function () {};

zrequire('people');
zrequire('stream_data');
zrequire('server_events_dispatch');

people.add_active_user(test_user);

const dispatch = server_events_dispatch.dispatch_normal_event;

function test(label, f) {
    stream_data.clear_subscriptions();

    run_test(label, () => {
        global.with_overrides(f);
    });
}

test('add', (override) => {
    const event = event_fixtures.subscription__add;

    const sub = event.subscriptions[0];
    const stream_id = sub.stream_id;

    stream_data.add_sub({
        stream_id: stream_id,
        name: sub.name,
    });

    global.with_stub(function (subscription_stub) {
        override('stream_events.mark_subscribed', subscription_stub.f);
        dispatch(event);
        const args = subscription_stub.get_args('sub', 'subscribers');
        assert.deepEqual(args.sub.stream_id, stream_id);
        assert.deepEqual(args.subscribers, event.subscriptions[0].subscribers);
    });
});

test('peer add/remove', (override) => {
    let event = event_fixtures.subscription__peer_add;

    stream_data.add_sub({
        name: 'devel',
        stream_id: event.stream_id,
    });

    const subs_stub = global.make_stub();
    override('subs.rerender_subscriptions_settings', subs_stub.f);

    const compose_fade_stub = global.make_stub();
    override('compose_fade.update_faded_users', compose_fade_stub.f);

    dispatch(event);
    assert.equal(compose_fade_stub.num_calls, 1);
    assert.equal(subs_stub.num_calls, 1);

    event = event_fixtures.subscription__peer_remove;
    dispatch(event);
    assert.equal(compose_fade_stub.num_calls, 2);
    assert.equal(subs_stub.num_calls, 2);
});

test('remove', (override) => {
    const event = event_fixtures.subscription__remove;
    const event_sub = event.subscriptions[0];
    const stream_id = event_sub.stream_id;

    const sub = {
        stream_id: stream_id,
        name: event_sub.name,
    };

    stream_data.add_sub(sub);

    global.with_stub(function (stub) {
        override('stream_events.mark_unsubscribed', stub.f);
        dispatch(event);
        const args = stub.get_args('sub');
        assert.deepEqual(args.sub, sub);
    });
});

test('update', (override) => {
    const event = event_fixtures.subscription__update;
    global.with_stub(function (stub) {
        override('stream_events.update_property', stub.f);
        dispatch(event);
        const args = stub.get_args('stream_id', 'property', 'value');
        assert.deepEqual(args.stream_id, event.stream_id);
        assert.deepEqual(args.property, event.property);
        assert.deepEqual(args.value, event.value);
    });
});

test('add error handling', (override) => {
    // test blueslip errors/warns
    const event = event_fixtures.subscription__add;
    global.with_stub(function (stub) {
        override('blueslip.error', stub.f);
        dispatch(event);
        assert.deepEqual(stub.get_args('param').param, 'Subscribing to unknown stream with ID 42');
    });

});

test('peer event error handling (bad stream_ids)', (override) => {
    override('compose_fade.update_faded_users', noop);

    const add_event = {
        type: 'subscription',
        op: 'peer_add',
        stream_id: 99999,
    };

    blueslip.expect('warn', 'Cannot find stream for peer_add: 99999');
    dispatch(add_event);
    blueslip.reset();

    const remove_event = {
        type: 'subscription',
        op: 'peer_remove',
        stream_id: 99999,
    };

    blueslip.expect('warn', 'Cannot find stream for peer_remove: 99999');
    dispatch(remove_event);
});

test('peer event error handling (add_subscriber)', (override) => {
    stream_data.add_sub({
        name: 'devel',
        stream_id: 1,
    });

    override('stream_data.add_subscriber', () => false);

    const add_event = {
        type: 'subscription',
        op: 'peer_add',
        stream_id: 1,
        user_id: 99999, // id is irrelevant
    };

    blueslip.expect('warn', 'Cannot process peer_add event');
    dispatch(add_event);
    blueslip.reset();

    override('stream_data.remove_subscriber', () => false);

    const remove_event = {
        type: 'subscription',
        op: 'peer_remove',
        stream_id: 1,
        user_id: 99999, // id is irrelevant
    };

    blueslip.expect('warn', 'Cannot process peer_remove event.');
    dispatch(remove_event);
});