"""Unit tests for application configuration and validation."""

import pytest
from pydantic import ValidationError

from app.config import Settings


def test_fail2ban_start_command_validates_simple_command() -> None:
    """Simple fail2ban commands without special characters are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
        fail2ban_start_command="fail2ban-client start",
    )
    assert settings.fail2ban_start_command == "fail2ban-client start"


def test_fail2ban_start_command_validates_systemctl_command() -> None:
    """systemctl commands are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
        fail2ban_start_command="systemctl start fail2ban",
    )
    assert settings.fail2ban_start_command == "systemctl start fail2ban"


def test_fail2ban_start_command_accepts_quoted_paths() -> None:
    """Commands with quoted paths containing spaces are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
        fail2ban_start_command='"/opt/my tools/fail2ban-client" start',
    )
    assert settings.fail2ban_start_command == '"/opt/my tools/fail2ban-client" start'


def test_fail2ban_start_command_rejects_mismatched_quotes() -> None:
    """Commands with mismatched quotes raise ValidationError."""
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="test-secret-key-do-not-use-in-production",
            fail2ban_start_command='"/opt/my tools/fail2ban-client start',
        )
    error_msg = str(exc_info.value)
    assert "fail2ban_start_command" in error_msg
    assert "mismatched quotes" in error_msg or "No closing quotation" in error_msg


def test_fail2ban_start_command_error_includes_problematic_value() -> None:
    """Validation errors include the problematic command value."""
    problematic_command = '"/opt/broken start'
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="test-secret-key-do-not-use-in-production",
            fail2ban_start_command=problematic_command,
        )
    error_msg = str(exc_info.value)
    assert problematic_command in error_msg


def test_fail2ban_start_command_default_value_is_valid() -> None:
    """The default fail2ban_start_command value is valid and parseable."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
    )
    assert settings.fail2ban_start_command == "fail2ban-client start"


def test_fail2ban_start_command_single_quoted() -> None:
    """Commands with single quotes are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
        fail2ban_start_command="'/usr/bin/fail2ban-client' start",
    )
    assert settings.fail2ban_start_command == "'/usr/bin/fail2ban-client' start"


def test_fail2ban_start_command_multiple_arguments() -> None:
    """Commands with multiple arguments are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="test-secret-key-do-not-use-in-production",
        fail2ban_start_command="fail2ban-client -c /etc/fail2ban start",
    )
    assert settings.fail2ban_start_command == "fail2ban-client -c /etc/fail2ban start"


def test_session_secret_enforces_minimum_length() -> None:
    """session_secret must be at least 32 characters."""
    # Test with a secret shorter than 32 characters
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="short-secret",
        )
    error_msg = str(exc_info.value)
    assert "session_secret" in error_msg
    assert "32" in error_msg or "at least" in error_msg


def test_session_secret_accepts_32_characters() -> None:
    """session_secret with exactly 32 characters is accepted."""
    secret_32 = "a" * 32  # Exactly 32 characters
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret=secret_32,
    )
    assert settings.session_secret == secret_32


def test_session_secret_accepts_longer_than_32() -> None:
    """session_secret with more than 32 characters is accepted."""
    secret_64 = "b" * 64  # 64 characters
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret=secret_64,
    )
    assert settings.session_secret == secret_64


def test_session_secret_error_message_includes_guidance() -> None:
    """Validation error for short session_secret includes secret generation guidance."""
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="too-short",
        )
    error_msg = str(exc_info.value)
    # Verify the error mentions the constraint
    assert "session_secret" in error_msg


# ---------------------------------------------------------------------------
# trusted_proxies configuration tests
# ---------------------------------------------------------------------------


def test_trusted_proxies_default_is_empty_list() -> None:
    """By default, trusted_proxies is an empty list (no trusted proxies)."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
    )
    assert settings.trusted_proxies == []


def test_trusted_proxies_accepts_single_ip() -> None:
    """Single IP address is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="192.168.1.1",
    )
    assert settings.trusted_proxies == ["192.168.1.1"]


def test_trusted_proxies_accepts_single_cidr() -> None:
    """Single CIDR range is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="10.0.0.0/8",
    )
    assert settings.trusted_proxies == ["10.0.0.0/8"]


def test_trusted_proxies_accepts_comma_separated_list() -> None:
    """Comma-separated list of IPs and CIDRs is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="192.168.1.1,10.0.0.0/8,172.16.0.0/12",
    )
    assert settings.trusted_proxies == ["192.168.1.1", "10.0.0.0/8", "172.16.0.0/12"]


def test_trusted_proxies_accepts_list() -> None:
    """List of IPs and CIDRs is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies=["192.168.1.1", "10.0.0.0/8"],
    )
    assert settings.trusted_proxies == ["192.168.1.1", "10.0.0.0/8"]


def test_trusted_proxies_strips_whitespace() -> None:
    """Whitespace around IPs is stripped."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="  192.168.1.1  ,  10.0.0.0/8  ",
    )
    assert settings.trusted_proxies == ["192.168.1.1", "10.0.0.0/8"]


def test_trusted_proxies_rejects_invalid_ip() -> None:
    """Invalid IP address is rejected."""
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="a" * 32,
            trusted_proxies="not-an-ip",
        )
    error_msg = str(exc_info.value)
    assert "trusted_proxies" in error_msg or "Invalid IP" in error_msg


def test_trusted_proxies_rejects_invalid_cidr() -> None:
    """Invalid CIDR range is rejected."""
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="a" * 32,
            trusted_proxies="10.0.0.0/33",  # Invalid - /33 is out of range for IPv4
        )
    error_msg = str(exc_info.value)
    assert "trusted_proxies" in error_msg or "Invalid IP" in error_msg


def test_trusted_proxies_rejects_one_invalid_in_list() -> None:
    """One invalid IP in a list causes entire list to be rejected."""
    with pytest.raises(ValidationError) as exc_info:
        Settings(
            database_path="/tmp/test.db",
            fail2ban_socket="/tmp/fake_fail2ban.sock",
            fail2ban_config_dir="/tmp/fail2ban",
            session_secret="a" * 32,
            trusted_proxies="192.168.1.1,invalid-ip,10.0.0.0/8",
        )
    error_msg = str(exc_info.value)
    assert "trusted_proxies" in error_msg or "Invalid IP" in error_msg


def test_trusted_proxies_accepts_ipv6_address() -> None:
    """IPv6 address is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="2001:db8::1",
    )
    assert settings.trusted_proxies == ["2001:db8::1"]


def test_trusted_proxies_accepts_ipv6_cidr() -> None:
    """IPv6 CIDR range is accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="2001:db8::/32",
    )
    assert settings.trusted_proxies == ["2001:db8::/32"]


def test_trusted_proxies_accepts_mixed_ipv4_and_ipv6() -> None:
    """Mixed IPv4 and IPv6 addresses and ranges are accepted."""
    settings = Settings(
        database_path="/tmp/test.db",
        fail2ban_socket="/tmp/fake_fail2ban.sock",
        fail2ban_config_dir="/tmp/fail2ban",
        session_secret="a" * 32,
        trusted_proxies="192.168.1.0/24,2001:db8::/32,10.0.0.1",
    )
    assert settings.trusted_proxies == ["192.168.1.0/24", "2001:db8::/32", "10.0.0.1"]