"""
Test pydantic_settings.YamlConfigSettingsSource.
"""

from pathlib import Path
from typing import Tuple, Type, Union

import pytest
from pydantic import BaseModel

from pydantic_settings import (
    BaseSettings,
    PydanticBaseSettingsSource,
    SettingsConfigDict,
    YamlConfigSettingsSource,
)

try:
    import yaml
except ImportError:
    yaml = None


def test_repr() -> None:
    source = YamlConfigSettingsSource(BaseSettings(), Path('config.yaml'))
    assert repr(source) == 'YamlConfigSettingsSource(yaml_file=config.yaml)'


@pytest.mark.skipif(yaml, reason='PyYAML is installed')
def test_yaml_not_installed(tmp_path):
    p = tmp_path / '.env'
    p.write_text(
        """
    foobar: "Hello"
    """
    )

    class Settings(BaseSettings):
        foobar: str
        model_config = SettingsConfigDict(yaml_file=p)

        @classmethod
        def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
        ) -> Tuple[PydanticBaseSettingsSource, ...]:
            return (YamlConfigSettingsSource(settings_cls),)

    with pytest.raises(ImportError, match=r'^PyYAML is not installed, run `pip install pydantic-settings\[yaml\]`$'):
        Settings()


@pytest.mark.skipif(yaml is None, reason='pyYaml is not installed')
def test_yaml_file(tmp_path):
    p = tmp_path / '.env'
    p.write_text(
        """
    foobar: "Hello"
    null_field:
    nested:
        nested_field: "world!"
    """
    )

    class Nested(BaseModel):
        nested_field: str

    class Settings(BaseSettings):
        foobar: str
        nested: Nested
        null_field: Union[str, None]
        model_config = SettingsConfigDict(yaml_file=p)

        @classmethod
        def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
        ) -> Tuple[PydanticBaseSettingsSource, ...]:
            return (YamlConfigSettingsSource(settings_cls),)

    s = Settings()
    assert s.foobar == 'Hello'
    assert s.nested.nested_field == 'world!'


@pytest.mark.skipif(yaml is None, reason='pyYaml is not installed')
def test_yaml_no_file():
    class Settings(BaseSettings):
        model_config = SettingsConfigDict(yaml_file=None)

        @classmethod
        def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
        ) -> Tuple[PydanticBaseSettingsSource, ...]:
            return (YamlConfigSettingsSource(settings_cls),)

    s = Settings()
    assert s.model_dump() == {}


@pytest.mark.skipif(yaml is None, reason='pyYaml is not installed')
def test_yaml_empty_file(tmp_path):
    p = tmp_path / '.env'
    p.write_text('')

    class Settings(BaseSettings):
        model_config = SettingsConfigDict(yaml_file=p)

        @classmethod
        def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
        ) -> Tuple[PydanticBaseSettingsSource, ...]:
            return (YamlConfigSettingsSource(settings_cls),)

    s = Settings()
    assert s.model_dump() == {}


@pytest.mark.skipif(yaml is None, reason='pyYAML is not installed')
def test_multiple_file_yaml(tmp_path):
    p3 = tmp_path / '.env.yaml3'
    p4 = tmp_path / '.env.yaml4'
    p3.write_text(
        """
    yaml3: 3
    """
    )
    p4.write_text(
        """
    yaml4: 4
    """
    )

    class Settings(BaseSettings):
        yaml3: int
        yaml4: int

        @classmethod
        def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
        ) -> Tuple[PydanticBaseSettingsSource, ...]:
            return (YamlConfigSettingsSource(settings_cls, yaml_file=[p3, p4]),)

    s = Settings()
    assert s.model_dump() == {'yaml3': 3, 'yaml4': 4}