import abc
import decimal
import datetime
from typing import Optional
from unittest import mock

import pytest
import redis
from pydantic import ValidationError

from redis_developer.orm import (
    HashModel,
    Field,
)
from redis_developer.orm.model import RedisModelError, QueryNotSupportedError, NotFoundError

r = redis.Redis()
today = datetime.date.today()


class BaseHashModel(HashModel, abc.ABC):
    class Meta:
        global_key_prefix = "redis-developer"


class Order(BaseHashModel):
    total: decimal.Decimal
    currency: str
    created_on: datetime.datetime


class Member(BaseHashModel):
    first_name: str = Field(index=True)
    last_name: str = Field(index=True)
    email: str = Field(index=True)
    join_date: datetime.date
    age: int = Field(index=True)

    class Meta:
        model_key_prefix = "member"
        primary_key_pattern = ""


@pytest.fixture()
def members():
    member1 = Member(
        first_name="Andrew",
        last_name="Brookins",
        email="a@example.com",
        age=38,
        join_date=today
    )

    member2 = Member(
        first_name="Kim",
        last_name="Brookins",
        email="k@example.com",
        age=34,
        join_date=today
    )

    member3 = Member(
        first_name="Andrew",
        last_name="Smith",
        email="as@example.com",
        age=100,
        join_date=today
    )
    member1.save()
    member2.save()
    member3.save()

    yield member1, member2, member3


def test_validates_required_fields():
    # Raises ValidationError: last_name is required
    with pytest.raises(ValidationError):
        Member(
            first_name="Andrew",
            zipcode="97086",
            join_date=today
        )


def test_validates_field():
    # Raises ValidationError: join_date is not a date
    with pytest.raises(ValidationError):
        Member(
            first_name="Andrew",
            last_name="Brookins",
            join_date="yesterday"
        )


# Passes validation
def test_validation_passes():
    member = Member(
        first_name="Andrew",
        last_name="Brookins",
        email="a@example.com",
        join_date=today,
        age=38
    )
    assert member.first_name == "Andrew"


def test_saves_model_and_creates_pk():
    member = Member(
        first_name="Andrew",
        last_name="Brookins",
        email="a@example.com",
        join_date=today,
        age=38
    )
    # Save a model instance to Redis
    member.save()

    member2 = Member.get(member.pk)
    assert member2 == member


def test_raises_error_with_embedded_models():
    class Address(BaseHashModel):
        address_line_1: str
        address_line_2: Optional[str]
        city: str
        country: str
        postal_code: str

    with pytest.raises(RedisModelError):
        class InvalidMember(BaseHashModel):
            address: Address


@pytest.mark.skip("Not implemented yet")
def test_saves_many():
    members = [
        Member(
            first_name="Andrew",
            last_name="Brookins",
            email="a@example.com",
            join_date=today
        ),
        Member(
            first_name="Kim",
            last_name="Brookins",
            email="k@example.com",
            join_date=today
        )
    ]
    Member.add(members)


@pytest.mark.skip("Not ready yet")
def test_updates_a_model(members):
    member1, member2, member3 = members

    # Or, with an implicit save:
    member1.update(last_name="Smith")
    assert Member.find(Member.pk == member1.pk).first() == member1

    # Or, affecting multiple model instances with an implicit save:
    Member.find(Member.last_name == "Brookins").update(last_name="Smith")
    results = Member.find(Member.last_name == "Smith")
    assert results == members


def test_paginate_query(members):
    member1, member2, member3 = members
    actual = Member.find().all(batch_size=1)
    assert actual == [member1, member2, member3]


def test_access_result_by_index_cached(members):
    member1, member2, member3 = members
    query = Member.find().sort_by('age')
    # Load the cache, throw away the result.
    assert query._model_cache == []
    query.execute()
    assert query._model_cache == [member2, member1, member3]

    # Access an item that should be in the cache.
    with mock.patch.object(query.model, 'db') as mock_db:
        assert query[0] == member2
        assert not mock_db.called


def test_access_result_by_index_not_cached(members):
    member1, member2, member3 = members
    query = Member.find().sort_by('age')

    # Assert that we don't have any models in the cache yet -- we
    # haven't made any requests of Redis.
    assert query._model_cache == []
    assert query[0] == member2
    assert query[1] == member1
    assert query[2] == member3


def test_exact_match_queries(members):
    member1, member2, member3 = members

    actual = Member.find(Member.last_name == "Brookins").all()
    assert actual == [member1, member2]

    actual = Member.find(
        (Member.last_name == "Brookins") & ~(Member.first_name == "Andrew")).all()
    assert actual == [member2]

    actual = Member.find(~(Member.last_name == "Brookins")).all()
    assert actual == [member3]

    actual = Member.find(Member.last_name != "Brookins").all()
    assert actual == [member3]

    actual = Member.find(
        (Member.last_name == "Brookins") & (Member.first_name == "Andrew")
        | (Member.first_name == "Kim")
    ).all()
    assert actual == [member1, member2]

    actual = Member.find(Member.first_name == "Kim", Member.last_name == "Brookins").all()
    assert actual == [member2]


def test_recursive_query_resolution(members):
    member1, member2, member3 = members

    actual = Member.find((Member.last_name == "Brookins") | (
        Member.age == 100
    ) & (Member.last_name == "Smith")).all()
    assert actual == [member1, member2, member3]


def test_tag_queries_boolean_logic(members):
    member1, member2, member3 = members

    actual = Member.find(
        (Member.first_name == "Andrew") &
        (Member.last_name == "Brookins") | (Member.last_name == "Smith")).all()
    assert actual == [member1, member3]


def test_tag_queries_punctuation():
    member1 = Member(
        first_name="Andrew, the Michael",
        last_name="St. Brookins-on-Pier",
        email="a|b@example.com",  # NOTE: This string uses the TAG field separator.
        age=38,
        join_date=today,
    )
    member1.save()

    member2 = Member(
        first_name="Bob",
        last_name="the Villain",
        email="a|villain@example.com",  # NOTE: This string uses the TAG field separator.
        age=38,
        join_date=today,
    )
    member2.save()

    assert Member.find(Member.first_name == "Andrew, the Michael").first() == member1
    assert Member.find(Member.last_name == "St. Brookins-on-Pier").first() == member1

    # Notice that when we index and query multiple values that use the internal
    # TAG separator for single-value exact-match fields, like an indexed string,
    # the queries will succeed. We apply a workaround that queries for the union
    # of the two values separated by the tag separator.
    assert Member.find(Member.email == "a|b@example.com").all() == [member1]
    assert Member.find(Member.email == "a|villain@example.com").all() == [member2]


def test_tag_queries_negation(members):
    member1, member2, member3 = members

    """
           ┌first_name
     NOT EQ┤
           └Andrew

    """
    query = Member.find(
        ~(Member.first_name == "Andrew")
    )
    assert query.all() == [member2]

    """
               ┌first_name
        ┌NOT EQ┤
        |      └Andrew
     AND┤
        |  ┌last_name
        └EQ┤
           └Brookins

    """
    query = Member.find(
        ~(Member.first_name == "Andrew") & (Member.last_name == "Brookins")
    )
    assert query.all() == [member2]

    """
               ┌first_name
        ┌NOT EQ┤
        |      └Andrew
     AND┤
        |     ┌last_name
        |  ┌EQ┤
        |  |  └Brookins
        └OR┤
           |  ┌last_name
           └EQ┤
              └Smith
    """
    query = Member.find(
        ~(Member.first_name == "Andrew") &
        ((Member.last_name == "Brookins") | (Member.last_name == "Smith")))
    assert query.all() == [member2]

    """
                  ┌first_name
           ┌NOT EQ┤
           |      └Andrew
       ┌AND┤
       |   |  ┌last_name
       |   └EQ┤
       |      └Brookins
     OR┤
       |  ┌last_name
       └EQ┤
          └Smith
    """
    query = Member.find(
        ~(Member.first_name == "Andrew") &
        (Member.last_name == "Brookins") | (Member.last_name == "Smith"))
    assert query.all() == [member2, member3]

    actual = Member.find(
        (Member.first_name == "Andrew") & ~(Member.last_name == "Brookins")).all()
    assert actual == [member3]


def test_numeric_queries(members):
    member1, member2, member3 = members

    actual = Member.find(Member.age == 34).all()
    assert actual == [member2]

    actual = Member.find(Member.age > 34).all()
    assert actual == [member1, member3]

    actual = Member.find(Member.age < 35).all()
    assert actual == [member2]

    actual = Member.find(Member.age <= 34).all()
    assert actual == [member2]

    actual = Member.find(Member.age >= 100).all()
    assert actual == [member3]

    actual = Member.find(~(Member.age == 100)).all()
    assert actual == [member1, member2]


def test_sorting(members):
    member1, member2, member3 = members

    actual = Member.find(Member.age > 34).sort_by('age').all()
    assert actual == [member1, member3]

    actual = Member.find(Member.age > 34).sort_by('-age').all()
    assert actual == [member3, member1]

    with pytest.raises(QueryNotSupportedError):
        # This field does not exist.
        Member.find().sort_by('not-a-real-field').all()

    with pytest.raises(QueryNotSupportedError):
        # This field is not sortable.
        Member.find().sort_by('join_date').all()


def test_not_found():
    with pytest.raises(NotFoundError):
        # This ID does not exist.
        Member.get(1000)


def test_schema():
    class Address(BaseHashModel):
        a_string: str = Field(index=True)
        a_full_text_string: str = Field(index=True, full_text_search=True)
        an_integer: int = Field(index=True, sortable=True)
        a_float: float = Field(index=True)
        another_integer: int
        another_float: float

    assert Address.redisearch_schema() == "ON HASH PREFIX 1 redis-developer:tests.test_hash_model.Address: SCHEMA pk TAG SEPARATOR | a_string TAG SEPARATOR | a_full_text_string TAG SEPARATOR | a_full_text_string_fts TEXT an_integer NUMERIC SORTABLE a_float NUMERIC"