zrequire('Filter', 'js/filter');
zrequire('MessageListData', 'js/message_list_data');
zrequire('narrow_state');
zrequire('narrow');
zrequire('stream_data');
zrequire('util');

set_global('message_list', {});
set_global('muting', {
    is_topic_muted: () => false,
});

function test_with(fixture) {
    const filter = new Filter(fixture.filter_terms);
    narrow_state.set_current_filter(filter);

    // Make sure our simulated tests data satisfies the
    // invarariant that the first unread message we find
    // does indeed satisfy our filter.
    if (fixture.unread_info.flavor === 'found') {
        _.each(fixture.all_messages, (msg) => {
            if (msg.id === fixture.unread_info.msg_id) {
                assert(filter.predicate()(msg));
            }
        });
    }

    const muting_enabled = narrow_state.muting_enabled();
    const msg_data = new MessageListData({
        filter: narrow_state.filter(),
        muting_enabled: muting_enabled,
    });
    const id_info = {
        target_id: fixture.target_id,
        local_select_id: undefined,
        final_select_id: undefined,
    };

    message_list.all = {
        fetch_status: {
            has_found_newest: () => fixture.has_found_newest,
        },
        empty: () => fixture.empty,
        all_messages: () => {
            assert(fixture.all_messages !== undefined);
            return fixture.all_messages;
        },
        first: () => {
            assert(fixture.all_messages !== undefined);
            return fixture.all_messages[0];
        },
        last: () => {
            assert(fixture.all_messages !== undefined);
            return fixture.all_messages[fixture.all_messages.length - 1];
        },
    };

    narrow_state.get_first_unread_info = () => fixture.unread_info;

    narrow.maybe_add_local_messages({
        id_info: id_info,
        msg_data: msg_data,
    });

    assert.deepEqual(id_info, fixture.expected_id_info);

    const msgs = msg_data.all_messages();
    const msg_ids = _.pluck(msgs, 'id');
    assert.deepEqual(msg_ids, fixture.expected_msg_ids);
}

run_test('near after unreads', () => {
    const fixture = {
        filter_terms: [
            {operator: 'near', operand: 42},
        ],
        target_id: 42,
        unread_info: {
            flavor: 'found',
            msg_id: 37,
        },
        has_found_newest: false,
        all_messages: [
            {id: 37},
            {id: 42},
            {id: 44},
        ],
        expected_id_info: {
            target_id: 42,
            final_select_id: 37,
            local_select_id: 37,
        },
        expected_msg_ids: [37, 42, 44],
    };

    test_with(fixture);
});

run_test('near not in message list', () => {
    const fixture = {
        filter_terms: [
            {operator: 'near', operand: 42},
        ],
        target_id: 42,
        unread_info: {
            flavor: 'found',
            msg_id: 46,
        },
        has_found_newest: false,
        all_messages: [
            {id: 45},
            {id: 46},
        ],
        expected_id_info: {
            target_id: 42,
            final_select_id: 42,
            local_select_id: undefined,
        },
        expected_msg_ids: [45, 46],
    };

    test_with(fixture);
});

run_test('near before unreads', () => {
    const fixture = {
        filter_terms: [
            {operator: 'near', operand: 42},
        ],
        target_id: 42,
        unread_info: {
            flavor: 'found',
            msg_id: 43,
        },
        has_found_newest: false,
        all_messages: [
            {id: 42},
            {id: 43},
            {id: 44},
        ],
        expected_id_info: {
            target_id: 42,
            final_select_id: 42,
            local_select_id: 42,
        },
        expected_msg_ids: [42, 43, 44],
    };

    test_with(fixture);
});

run_test('near with no unreads', () => {
    const fixture = {
        filter_terms: [
            {operator: 'near', operand: 42},
        ],
        target_id: 42,
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: false,
        empty: true,
        expected_id_info: {
            target_id: 42,
            final_select_id: 42,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('is private with no target', () => {
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'private'},
        ],
        unread_info: {
            flavor: 'found',
            msg_id: 550,
        },
        has_found_newest: true,
        all_messages: [
            {id: 450, type: 'private'},
            {id: 500, type: 'private'},
            {id: 550, type: 'private'},
        ],
        expected_id_info: {
            target_id: undefined,
            final_select_id: 550,
            local_select_id: 550,
        },
        expected_msg_ids: [450, 500, 550],
    };

    test_with(fixture);
});

run_test('pm-with with target outside of range', () => {
    const fixture = {
        filter_terms: [
            {operator: 'pm-with', operand: 'alice@example.com'},
        ],
        target_id: 5,
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: false,
        all_messages: [
            {id: 999},
        ],
        expected_id_info: {
            target_id: 5,
            final_select_id: 5,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('is:private with no unreads before fetch', () => {
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'private'},
        ],
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: false,
        empty: true,
        expected_id_info: {
            target_id: undefined,
            final_select_id: undefined,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('is:private with target and no unreads', () => {
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'private'},
        ],
        target_id: 450,
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: true,
        empty: false,
        all_messages: [
            {id: 350},
            {id: 400, type: 'private'},
            {id: 450, type: 'private'},
            {id: 500, type: 'private'},
        ],
        expected_id_info: {
            target_id: 450,
            final_select_id: 450,
            local_select_id: 450,
        },
        expected_msg_ids: [400, 450, 500],
    };

    test_with(fixture);
});

run_test('is:mentioned with no unreads and no matches', () => {
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'mentioned'},
        ],
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: true,
        all_messages: [],
        expected_id_info: {
            target_id: undefined,
            final_select_id: undefined,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('is:alerted with no unreads and one match', () => {
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'alerted'},
        ],
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: true,
        all_messages: [
            {id: 55, alerted: true},
            {id: 57, alerted: false},
        ],
        expected_id_info: {
            target_id: undefined,
            final_select_id: 55,
            local_select_id: 55,
        },
        expected_msg_ids: [55],
    };

    test_with(fixture);
});

run_test('search', () => {
    const fixture = {
        filter_terms: [
            {operator: 'search', operand: 'whatever'},
        ],
        unread_info: {
            flavor: 'cannot_compute',
        },
        expected_id_info: {
            target_id: undefined,
            final_select_id: undefined,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('search near', () => {
    const fixture = {
        filter_terms: [
            {operator: 'search', operand: 'whatever'},
            {operator: 'near', operand: 22},
        ],
        target_id: 22,
        unread_info: {
            flavor: 'cannot_compute',
        },
        expected_id_info: {
            target_id: 22,
            final_select_id: 22,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('stream, no unread, not in all_messages', () => {
    // This might be something you'd see zooming out from
    // a muted topic, maybe?  It's possibly this scenario
    // is somewhat contrived, but we exercise fairly simple
    // defensive code that just punts when messages aren't in
    // our new message list.  Note that our target_id is within
    // the range of all_messages.
    const fixture = {
        filter_terms: [
            {operator: 'stream', operand: 'whatever'},
        ],
        target_id: 450,
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: true,
        empty: false,
        all_messages: [
            {id: 400},
            {id: 500},
        ],
        expected_id_info: {
            target_id: 450,
            final_select_id: 450,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('stream/topic not in all_messages', () => {
    // This is a bit of a corner case, but you could have a scenario
    // where you've gone way back in a topic (perhaps something that
    // has been muted a long time) and find an unread message that isn't
    // actually in message_list.all.
    const fixture = {
        filter_terms: [
            {operator: 'stream', operand: 'one'},
            {operator: 'topic', operand: 'whatever'},
        ],
        target_id: 1000,
        unread_info: {
            flavor: 'found',
            msg_id: 2,
        },
        has_found_newest: true,
        all_messages: [
            {id: 900},
            {id: 1100},
        ],
        expected_id_info: {
            target_id: 1000,
            final_select_id: 2,
            local_select_id: undefined,
        },
        expected_msg_ids: [],
    };

    test_with(fixture);
});

run_test('final corner case', () => {
    // This tries to get all the way to the end of
    // the function (as written now).  The data here
    // may be completely contrived.
    const fixture = {
        filter_terms: [
            {operator: 'is', operand: 'starred'},
        ],
        target_id: 450,
        unread_info: {
            flavor: 'not_found',
        },
        has_found_newest: true,
        empty: false,
        all_messages: [
            {id: 400},
            {id: 425, starred: true},
            {id: 500},
        ],
        expected_id_info: {
            target_id: 450,
            final_select_id: 450,
            local_select_id: undefined,
        },
        expected_msg_ids: [425],
    };

    test_with(fixture);
});