import pytest
import redis
import redis.client

from test import testtools


def test_hstrlen_missing(r: redis.Redis):
    assert r.hstrlen("foo", "doesnotexist") == 0

    r.hset("foo", "key", "value")
    assert r.hstrlen("foo", "doesnotexist") == 0


def test_hstrlen(r: redis.Redis):
    r.hset("foo", "key", "value")
    assert r.hstrlen("foo", "key") == 5


def test_hset_then_hget(r: redis.Redis):
    assert r.hset("foo", "key", "value") == 1
    assert r.hget("foo", "key") == b"value"


def test_hset_update(r: redis.Redis):
    assert r.hset("foo", "key", "value") == 1
    assert r.hset("foo", "key", "value") == 0


def test_hset_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hset("foo", "key", "value")


def test_hgetall(r: redis.Redis):
    assert r.hset("foo", "k1", "v1") == 1
    assert r.hset("foo", "k2", "v2") == 1
    assert r.hset("foo", "k3", "v3") == 1
    assert r.hgetall("foo") == {b"k1": b"v1", b"k2": b"v2", b"k3": b"v3"}


def test_hgetall_empty_key(r: redis.Redis):
    assert r.hgetall("foo") == {}


def test_hgetall_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hgetall("foo")


def test_hexists(r: redis.Redis):
    r.hset("foo", "bar", "v1")
    assert r.hexists("foo", "bar") == 1
    assert r.hexists("foo", "baz") == 0
    assert r.hexists("bar", "bar") == 0


def test_hexists_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hexists("foo", "key")


def test_hkeys(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    r.hset("foo", "k2", "v2")
    assert set(r.hkeys("foo")) == {b"k1", b"k2"}
    assert set(r.hkeys("bar")) == set()


def test_hkeys_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hkeys("foo")


def test_hlen(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    r.hset("foo", "k2", "v2")
    assert r.hlen("foo") == 2


def test_hlen_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hlen("foo")


def test_hvals(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    r.hset("foo", "k2", "v2")
    assert set(r.hvals("foo")) == {b"v1", b"v2"}
    assert set(r.hvals("bar")) == set()


def test_hvals_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hvals("foo")


def test_hmget(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    r.hset("foo", "k2", "v2")
    r.hset("foo", "k3", "v3")
    # Normal case.
    assert r.hmget("foo", ["k1", "k3"]) == [b"v1", b"v3"]
    assert r.hmget("foo", "k1", "k3") == [b"v1", b"v3"]
    # Key does not exist.
    assert r.hmget("bar", ["k1", "k3"]) == [None, None]
    assert r.hmget("bar", "k1", "k3") == [None, None]
    # Some keys in the hash do not exist.
    assert r.hmget("foo", ["k1", "k500"]) == [b"v1", None]
    assert r.hmget("foo", "k1", "k500") == [b"v1", None]


def test_hmget_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hmget("foo", "key1", "key2")


def test_hdel(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    r.hset("foo", "k2", "v2")
    r.hset("foo", "k3", "v3")
    assert r.hget("foo", "k1") == b"v1"
    assert r.hdel("foo", "k1") == 1
    assert r.hget("foo", "k1") is None
    assert r.hdel("foo", "k1") == 0
    # Since redis>=2.7.6 returns number of deleted items.
    assert r.hdel("foo", "k2", "k3") == 2
    assert r.hget("foo", "k2") is None
    assert r.hget("foo", "k3") is None
    assert r.hdel("foo", "k2", "k3") == 0


def test_hdel_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hdel("foo", "key")


def test_hincrby(r: redis.Redis):
    r.hset("foo", "counter", 0)
    assert r.hincrby("foo", "counter") == 1
    assert r.hincrby("foo", "counter") == 2
    assert r.hincrby("foo", "counter") == 3


def test_hincrby_with_no_starting_value(r: redis.Redis):
    assert r.hincrby("foo", "counter") == 1
    assert r.hincrby("foo", "counter") == 2
    assert r.hincrby("foo", "counter") == 3


def test_hincrby_with_range_param(r: redis.Redis):
    assert r.hincrby("foo", "counter", 2) == 2
    assert r.hincrby("foo", "counter", 2) == 4
    assert r.hincrby("foo", "counter", 2) == 6


def test_hincrby_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hincrby("foo", "key", 2)


def test_hincrbyfloat(r: redis.Redis):
    r.hset("foo", "counter", 0.0)
    assert r.hincrbyfloat("foo", "counter") == 1.0
    assert r.hincrbyfloat("foo", "counter") == 2.0
    assert r.hincrbyfloat("foo", "counter") == 3.0


def test_hincrbyfloat_with_no_starting_value(r: redis.Redis):
    assert r.hincrbyfloat("foo", "counter") == 1.0
    assert r.hincrbyfloat("foo", "counter") == 2.0
    assert r.hincrbyfloat("foo", "counter") == 3.0


def test_hincrbyfloat_with_range_param(r: redis.Redis):
    assert r.hincrbyfloat("foo", "counter", 0.1) == pytest.approx(0.1)
    assert r.hincrbyfloat("foo", "counter", 0.1) == pytest.approx(0.2)
    assert r.hincrbyfloat("foo", "counter", 0.1) == pytest.approx(0.3)


def test_hincrbyfloat_on_non_float_value_raises_error(r: redis.Redis):
    r.hset("foo", "counter", "cat")
    with pytest.raises(redis.ResponseError):
        r.hincrbyfloat("foo", "counter")


def test_hincrbyfloat_with_non_float_amount_raises_error(r: redis.Redis):
    with pytest.raises(redis.ResponseError):
        r.hincrbyfloat("foo", "counter", "cat")


def test_hincrbyfloat_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hincrbyfloat("foo", "key", 0.1)


def test_hincrbyfloat_precision(r: redis.Redis):
    x = 1.23456789123456789
    assert r.hincrbyfloat("foo", "bar", x) == x
    assert float(r.hget("foo", "bar")) == x


def test_hsetnx(r: redis.Redis):
    assert r.hsetnx("foo", "newkey", "v1") == 1
    assert r.hsetnx("foo", "newkey", "v1") == 0
    assert r.hget("foo", "newkey") == b"v1"


def test_hmset_empty_raises_error(r: redis.Redis):
    with pytest.raises(redis.DataError):
        r.hmset("foo", {})


@testtools.run_test_if_redispy_ver("lte", "4.6")
def test_hmset_redispy4(r: redis.Redis):
    r.hset("foo", "k1", "v1")
    assert r.hmset("foo", {"k2": "v2", "k3": "v3"}) is True


def test_hmset_wrong_type(r: redis.Redis):
    r.zadd("foo", {"bar": 1})
    with pytest.raises(redis.ResponseError):
        r.hmset("foo", {"key": "value"})


def test_empty_hash(r: redis.Redis):
    r.hset("foo", "bar", "baz")
    r.hdel("foo", "bar")
    assert not r.exists("foo")


def test_hset_removing_last_field_delete_key(r: redis.Redis):
    r.hset(b"3L", b"f1", b"v1")
    r.hdel(b"3L", b"f1")
    assert r.keys("*") == []


def test_hscan(r: redis.Redis):
    # Set up the data
    name = "hscan-test"
    for ix in range(20):
        k = "key:%s" % ix
        v = "result:%s" % ix
        r.hset(name, k, v)
    expected = r.hgetall(name)
    assert len(expected) == 20  # Ensure we know what we're testing

    # Test that we page through the results and get everything out
    results = {}
    cursor = "0"
    while cursor != 0:
        cursor, data = r.hscan(name, cursor, count=6)
        results.update(data)
    assert expected == results

    # Test the iterator version
    results = {}
    for key, val in r.hscan_iter(name, count=6):
        results[key] = val
    assert expected == results

    # Now test that the MATCH functionality works
    results = {}
    cursor = "0"
    while cursor != 0:
        cursor, data = r.hscan(name, cursor, match="*7", count=100)
        results.update(data)
    assert b"key:7" in results
    assert b"key:17" in results
    assert len(results) == 2

    # Test the match on iterator
    results = {}
    for key, val in r.hscan_iter(name, match="*7"):
        results[key] = val
    assert b"key:7" in results
    assert b"key:17" in results
    assert len(results) == 2


def test_hrandfield(r: redis.Redis):
    assert r.hrandfield("key") is None
    hash = {b"a": 1, b"b": 2, b"c": 3, b"d": 4, b"e": 5}
    r.hset("key", mapping=hash)
    assert r.hrandfield("key") is not None
    assert len(r.hrandfield("key", 0)) == 0
    res = r.hrandfield("key", 2)
    assert len(res) == 2
    assert res[0] in set(hash.keys())
    assert res[1] in set(hash.keys())
    # with values
    res = r.hrandfield("key", 2, True)
    assert len(res) == 4
    assert res[0] in set(hash.keys())
    assert res[1] in {str(x).encode() for x in hash.values()}
    assert res[2] in set(hash.keys())
    assert res[3] in {str(x).encode() for x in hash.values()}
    # without duplications
    assert len(r.hrandfield("key", 10)) == 5
    # with duplications
    assert len(r.hrandfield("key", -10)) == 10

    with pytest.raises(redis.ResponseError):
        testtools.raw_command(r, "HRANDFIELD", "key", 3, "WITHVALUES", 3)