#  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 typing import List, Optional

import pyarrow as pa
import pydantic
import pytest

from lancedb.pydantic import PYDANTIC_VERSION, pydantic_to_schema, vector


@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
        # 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)
    )

    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,
            ),
        ]
    )
    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
        # 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)
    )

    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,
            ),
        ]
    )
    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))