# ABOUTME: Tests for the configuration module.
# ABOUTME: Validates environment variable loading, defaults, and validation.

import os
from unittest.mock import patch

import pytest
from pydantic import ValidationError


class TestConfigDefaults:
    """Test that config loads with correct default values."""

    def test_default_port(self):
        """Default port should be 3366 (EGG in leet)."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.port == 3366

    def test_default_db_path(self):
        """Default DB path should be animaltrack.db."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.db_path == "animaltrack.db"

    def test_default_auth_header_name(self):
        """Default auth header should be X-Oidc-Username."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.auth_header_name == "X-Oidc-Username"

    def test_default_trusted_proxy_ips_empty(self):
        """Default trusted proxy IPs should be empty list."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.trusted_proxy_ips == []

    def test_default_csrf_cookie_name(self):
        """Default CSRF cookie name should be csrf_token."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.csrf_cookie_name == "csrf_token"

    def test_default_base_path(self):
        """Default base path should be /."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.base_path == "/"

    def test_default_seed_on_start(self):
        """Default seed on start should be False."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.seed_on_start is False

    def test_default_log_level(self):
        """Default log level should be INFO."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.log_level == "INFO"

    def test_default_metrics_enabled(self):
        """Default metrics enabled should be False."""
        with patch.dict(os.environ, {"CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.metrics_enabled is True


class TestConfigEnvOverrides:
    """Test that environment variables override defaults."""

    def test_port_override(self):
        """PORT env var should override default."""
        with patch.dict(os.environ, {"PORT": "8080", "CSRF_SECRET": "test-secret"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.port == 8080

    def test_db_path_override(self):
        """DB_PATH env var should override default."""
        with patch.dict(
            os.environ, {"DB_PATH": "/data/custom.db", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.db_path == "/data/custom.db"

    def test_auth_header_name_override(self):
        """AUTH_HEADER_NAME env var should override default."""
        with patch.dict(
            os.environ,
            {"AUTH_HEADER_NAME": "X-Custom-User", "CSRF_SECRET": "test-secret"},
            clear=True,
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.auth_header_name == "X-Custom-User"

    def test_csrf_cookie_name_override(self):
        """CSRF_COOKIE_NAME env var should override default."""
        with patch.dict(
            os.environ, {"CSRF_COOKIE_NAME": "my_csrf", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.csrf_cookie_name == "my_csrf"

    def test_base_path_override(self):
        """BASE_PATH env var should override default."""
        with patch.dict(
            os.environ, {"BASE_PATH": "/app", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.base_path == "/app"

    def test_seed_on_start_true(self):
        """SEED_ON_START=true should set to True."""
        with patch.dict(
            os.environ, {"SEED_ON_START": "true", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.seed_on_start is True

    def test_seed_on_start_false(self):
        """SEED_ON_START=false should set to False."""
        with patch.dict(
            os.environ, {"SEED_ON_START": "false", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.seed_on_start is False

    def test_log_level_override(self):
        """LOG_LEVEL env var should override default."""
        with patch.dict(
            os.environ, {"LOG_LEVEL": "DEBUG", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.log_level == "DEBUG"

    def test_metrics_enabled_true(self):
        """METRICS_ENABLED=true should set to True."""
        with patch.dict(
            os.environ, {"METRICS_ENABLED": "true", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.metrics_enabled is True


class TestTrustedProxyIPs:
    """Test TRUSTED_PROXY_IPS parsing."""

    def test_single_ip(self):
        """Single IP should be parsed as list with one element."""
        with patch.dict(
            os.environ,
            {"TRUSTED_PROXY_IPS": "192.168.1.1", "CSRF_SECRET": "test-secret"},
            clear=True,
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.trusted_proxy_ips == ["192.168.1.1"]

    def test_multiple_ips_comma_separated(self):
        """Multiple IPs should be parsed from comma-separated string."""
        with patch.dict(
            os.environ,
            {"TRUSTED_PROXY_IPS": "192.168.1.1,10.0.0.1,172.16.0.1", "CSRF_SECRET": "test-secret"},
            clear=True,
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.trusted_proxy_ips == ["192.168.1.1", "10.0.0.1", "172.16.0.1"]

    def test_ips_with_spaces_trimmed(self):
        """Spaces around IPs should be trimmed."""
        with patch.dict(
            os.environ,
            {"TRUSTED_PROXY_IPS": " 192.168.1.1 , 10.0.0.1 ", "CSRF_SECRET": "test-secret"},
            clear=True,
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.trusted_proxy_ips == ["192.168.1.1", "10.0.0.1"]

    def test_empty_string_gives_empty_list(self):
        """Empty string should give empty list."""
        with patch.dict(
            os.environ, {"TRUSTED_PROXY_IPS": "", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.trusted_proxy_ips == []


class TestCsrfSecretRequired:
    """Test that CSRF_SECRET is required."""

    def test_missing_csrf_secret_raises_error(self):
        """Missing CSRF_SECRET should raise ValidationError."""
        with patch.dict(os.environ, {}, clear=True):
            from animaltrack.config import Settings

            with pytest.raises(ValidationError) as exc_info:
                Settings()
            # Check that the error is about csrf_secret
            errors = exc_info.value.errors()
            assert any(e["loc"] == ("csrf_secret",) for e in errors)

    def test_csrf_secret_provided(self):
        """Provided CSRF_SECRET should be accessible."""
        with patch.dict(os.environ, {"CSRF_SECRET": "my-super-secret-key"}, clear=True):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.csrf_secret == "my-super-secret-key"


class TestValidation:
    """Test validation of config values."""

    def test_invalid_port_not_integer(self):
        """Non-integer PORT should raise ValidationError."""
        with patch.dict(
            os.environ, {"PORT": "not-a-number", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            with pytest.raises(ValidationError):
                Settings()

    def test_invalid_log_level(self):
        """Invalid LOG_LEVEL should raise ValidationError."""
        with patch.dict(
            os.environ, {"LOG_LEVEL": "INVALID_LEVEL", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            with pytest.raises(ValidationError):
                Settings()

    def test_valid_log_levels(self):
        """All standard log levels should be valid."""
        valid_levels = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
        for level in valid_levels:
            with patch.dict(
                os.environ, {"LOG_LEVEL": level, "CSRF_SECRET": "test-secret"}, clear=True
            ):
                from animaltrack.config import Settings

                settings = Settings()
                assert settings.log_level == level

    def test_log_level_case_insensitive(self):
        """Log level should be case-insensitive (normalized to uppercase)."""
        with patch.dict(
            os.environ, {"LOG_LEVEL": "debug", "CSRF_SECRET": "test-secret"}, clear=True
        ):
            from animaltrack.config import Settings

            settings = Settings()
            assert settings.log_level == "DEBUG"