#  Copyright 2023 LanceDB Developers
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.


import json
import sys
from datetime import date, datetime
from typing import List, Optional

import pyarrow as pa
import pydantic
import pytest
from pydantic import Field

from lancedb.pydantic import PYDANTIC_VERSION, LanceModel, Vector, pydantic_to_schema


@pytest.mark.skipif(
    sys.version_info < (3, 9),
    reason="using native type alias requires python3.9 or higher",
)
def test_pydantic_to_arrow():
    class StructModel(pydantic.BaseModel):
        a: str
        b: Optional[float]

    class TestModel(pydantic.BaseModel):
        id: int
        s: str
        vec: list[float]
        li: List[int]
        opt: Optional[str] = None
        st: StructModel
        dt: date
        dtt: datetime
        # d: dict

    m = TestModel(
        id=1,
        s="hello",
        vec=[1.0, 2.0, 3.0],
        li=[2, 3, 4],
        st=StructModel(a="a", b=1.0),
        dt=date.today(),
        dtt=datetime.now(),
    )

    schema = pydantic_to_schema(TestModel)

    expect_schema = pa.schema(
        [
            pa.field("id", pa.int64(), False),
            pa.field("s", pa.utf8(), False),
            pa.field("vec", pa.list_(pa.float64()), False),
            pa.field("li", pa.list_(pa.int64()), False),
            pa.field("opt", pa.utf8(), True),
            pa.field(
                "st",
                pa.struct(
                    [pa.field("a", pa.utf8(), False), pa.field("b", pa.float64(), True)]
                ),
                False,
            ),
            pa.field("dt", pa.date32(), False),
            pa.field("dtt", pa.timestamp("us"), False),
        ]
    )
    assert schema == expect_schema


def test_pydantic_to_arrow_py38():
    class StructModel(pydantic.BaseModel):
        a: str
        b: Optional[float]

    class TestModel(pydantic.BaseModel):
        id: int
        s: str
        vec: List[float]
        li: List[int]
        opt: Optional[str] = None
        st: StructModel
        dt: date
        dtt: datetime
        # d: dict

    m = TestModel(
        id=1,
        s="hello",
        vec=[1.0, 2.0, 3.0],
        li=[2, 3, 4],
        st=StructModel(a="a", b=1.0),
        dt=date.today(),
        dtt=datetime.now(),
    )

    schema = pydantic_to_schema(TestModel)

    expect_schema = pa.schema(
        [
            pa.field("id", pa.int64(), False),
            pa.field("s", pa.utf8(), False),
            pa.field("vec", pa.list_(pa.float64()), False),
            pa.field("li", pa.list_(pa.int64()), False),
            pa.field("opt", pa.utf8(), True),
            pa.field(
                "st",
                pa.struct(
                    [pa.field("a", pa.utf8(), False), pa.field("b", pa.float64(), True)]
                ),
                False,
            ),
            pa.field("dt", pa.date32(), False),
            pa.field("dtt", pa.timestamp("us"), False),
        ]
    )
    assert schema == expect_schema


def test_fixed_size_list_field():
    class TestModel(pydantic.BaseModel):
        vec: Vector(16)
        li: List[int]

    data = TestModel(vec=list(range(16)), li=[1, 2, 3])
    if PYDANTIC_VERSION >= (2,):
        assert json.loads(data.model_dump_json()) == {
            "vec": list(range(16)),
            "li": [1, 2, 3],
        }
    else:
        assert data.dict() == {
            "vec": list(range(16)),
            "li": [1, 2, 3],
        }

    schema = pydantic_to_schema(TestModel)
    assert schema == pa.schema(
        [
            pa.field("vec", pa.list_(pa.float32(), 16), False),
            pa.field("li", pa.list_(pa.int64()), False),
        ]
    )

    if PYDANTIC_VERSION >= (2,):
        json_schema = TestModel.model_json_schema()
    else:
        json_schema = TestModel.schema()

    assert json_schema == {
        "properties": {
            "vec": {
                "items": {"type": "number"},
                "maxItems": 16,
                "minItems": 16,
                "title": "Vec",
                "type": "array",
            },
            "li": {"items": {"type": "integer"}, "title": "Li", "type": "array"},
        },
        "required": ["vec", "li"],
        "title": "TestModel",
        "type": "object",
    }


def test_fixed_size_list_validation():
    class TestModel(pydantic.BaseModel):
        vec: Vector(8)

    with pytest.raises(pydantic.ValidationError):
        TestModel(vec=range(9))

    with pytest.raises(pydantic.ValidationError):
        TestModel(vec=range(7))

    TestModel(vec=range(8))


def test_lance_model():
    class TestModel(LanceModel):
        vector: Vector(16) = Field(default=[0.0] * 16)
        li: List[int] = Field(default=[1, 2, 3])

    schema = pydantic_to_schema(TestModel)
    assert schema == TestModel.to_arrow_schema()
    assert TestModel.field_names() == ["vector", "li"]

    t = TestModel()
    assert t == TestModel(vec=[0.0] * 16, li=[1, 2, 3])