"""Tests unitarios para el módulo config."""

import os

import pytest
from pydantic import ValidationError


@pytest.fixture(autouse=True)
def clean_env(monkeypatch):
    """Limpia todas las variables de entorno relevantes antes de cada test."""
    env_vars = [
        "HOST",
        "USERNAME",
        "PASSWORD",
        "PORT",
        "UPDATE_INTERVAL",
        "OUTPUT_FILE",
    ]
    for var in env_vars:
        monkeypatch.delenv(var, raising=False)
    yield


class TestSettings:
    """Tests para la clase Settings."""

    def test_settings_with_required_fields(self, monkeypatch):
        """Test: Settings se crea correctamente con campos obligatorios."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")

        from m3u_list_builder.config import Settings

        # _env_file=None evita leer el archivo .env
        settings = Settings(_env_file=None)

        assert settings.host == "http://test.com"
        assert settings.username == "user"
        assert settings.password == "pass"

    def test_settings_default_values(self, monkeypatch):
        """Test: Settings usa valores por defecto correctos."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")

        from m3u_list_builder.config import Settings

        settings = Settings(_env_file=None)

        assert settings.port == 8080
        assert settings.update_interval == 3600
        assert settings.output_file == "playlist.m3u"

    def test_settings_custom_values(self, monkeypatch):
        """Test: Settings acepta valores personalizados."""
        monkeypatch.setenv("HOST", "http://custom.com")
        monkeypatch.setenv("USERNAME", "custom_user")
        monkeypatch.setenv("PASSWORD", "custom_pass")
        monkeypatch.setenv("PORT", "9090")
        monkeypatch.setenv("UPDATE_INTERVAL", "7200")
        monkeypatch.setenv("OUTPUT_FILE", "custom.m3u")

        from m3u_list_builder.config import Settings

        settings = Settings(_env_file=None)

        assert settings.host == "http://custom.com"
        assert settings.username == "custom_user"
        assert settings.password == "custom_pass"
        assert settings.port == 9090
        assert settings.update_interval == 7200
        assert settings.output_file == "custom.m3u"

    def test_settings_missing_required_host(self, monkeypatch):
        """Test: Settings falla sin HOST."""
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")

        from m3u_list_builder.config import Settings

        with pytest.raises(ValidationError) as exc_info:
            Settings(_env_file=None)

        assert "host" in str(exc_info.value).lower()

    def test_settings_missing_required_username(self, monkeypatch):
        """Test: Settings falla sin USERNAME."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("PASSWORD", "pass")

        from m3u_list_builder.config import Settings

        with pytest.raises(ValidationError) as exc_info:
            Settings(_env_file=None)

        assert "username" in str(exc_info.value).lower()

    def test_settings_missing_required_password(self, monkeypatch):
        """Test: Settings falla sin PASSWORD."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")

        from m3u_list_builder.config import Settings

        with pytest.raises(ValidationError) as exc_info:
            Settings(_env_file=None)

        assert "password" in str(exc_info.value).lower()

    def test_settings_invalid_port_type(self, monkeypatch):
        """Test: Settings falla con PORT inválido."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")
        monkeypatch.setenv("PORT", "invalid")

        from m3u_list_builder.config import Settings

        with pytest.raises(ValidationError):
            Settings(_env_file=None)

    def test_settings_extra_fields_ignored(self, monkeypatch):
        """Test: Settings ignora campos extra (extra='ignore')."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")
        monkeypatch.setenv("UNKNOWN_FIELD", "should_be_ignored")

        from m3u_list_builder.config import Settings

        # No debe lanzar excepción
        settings = Settings(_env_file=None)
        assert not hasattr(settings, "unknown_field")

    def test_settings_reads_env_file(self, tmp_path, monkeypatch):
        """Test: Settings puede leer desde archivo .env."""
        # Crear archivo .env temporal
        env_file = tmp_path / ".env"
        env_file.write_text(
            "HOST=http://from-env-file.com\nUSERNAME=envuser\nPASSWORD=envpass\n"
        )

        from m3u_list_builder.config import Settings

        settings = Settings(_env_file=str(env_file))

        assert settings.host == "http://from-env-file.com"
        assert settings.username == "envuser"
        assert settings.password == "envpass"

    def test_settings_invalid_port_type(self, monkeypatch):
        """Test: Settings falla con PORT inválido."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")
        monkeypatch.setenv("PORT", "invalid")

        from m3u_list_builder.config import Settings

        with pytest.raises(ValidationError):
            Settings()

    def test_settings_extra_fields_ignored(self, monkeypatch):
        """Test: Settings ignora campos extra (extra='ignore')."""
        monkeypatch.setenv("HOST", "http://test.com")
        monkeypatch.setenv("USERNAME", "user")
        monkeypatch.setenv("PASSWORD", "pass")
        monkeypatch.setenv("UNKNOWN_FIELD", "should_be_ignored")

        from m3u_list_builder.config import Settings

        # No debe lanzar excepción
        settings = Settings()
        assert not hasattr(settings, "unknown_field")