"""Tests for HMS error code translations."""

import pytest

from backend.app.services.hms_errors import HMS_ERROR_DESCRIPTIONS, get_error_description


class TestHMSErrorDescriptions:
    """Tests for the HMS error descriptions dictionary."""

    def test_dictionary_is_not_empty(self):
        """Verify the error descriptions dictionary has entries."""
        assert len(HMS_ERROR_DESCRIPTIONS) > 0

    def test_dictionary_has_expected_count(self):
        """Verify we have the expected number of error codes."""
        # Should have 853 error codes from the frontend
        assert len(HMS_ERROR_DESCRIPTIONS) == 853

    def test_all_keys_are_valid_format(self):
        """Verify all keys follow the XXXX_YYYY format."""
        import re

        pattern = re.compile(r"^[0-9A-F]{4}_[0-9A-F]{4}$")
        for code in HMS_ERROR_DESCRIPTIONS:
            assert pattern.match(code), f"Invalid error code format: {code}"

    def test_all_values_are_non_empty_strings(self):
        """Verify all descriptions are non-empty strings."""
        for code, description in HMS_ERROR_DESCRIPTIONS.items():
            assert isinstance(description, str), f"Description for {code} is not a string"
            assert len(description) > 0, f"Description for {code} is empty"


class TestGetErrorDescription:
    """Tests for the get_error_description function."""

    def test_returns_description_for_known_code(self):
        """Verify known error codes return their descriptions."""
        # 0300_400C = "The task was canceled."
        result = get_error_description("0300_400C")
        assert result == "The task was canceled."

    def test_returns_description_for_ams_error(self):
        """Verify AMS error codes return their descriptions."""
        # 0700_8010 = AMS assist motor overloaded
        result = get_error_description("0700_8010")
        assert "AMS assist motor" in result

    def test_returns_none_for_unknown_code(self):
        """Verify unknown error codes return None."""
        result = get_error_description("XXXX_YYYY")
        assert result is None

    def test_handles_lowercase_input(self):
        """Verify function handles lowercase input."""
        result = get_error_description("0300_400c")
        assert result == "The task was canceled."

    def test_handles_mixed_case_input(self):
        """Verify function handles mixed case input."""
        result = get_error_description("0300_400C")
        assert result == "The task was canceled."

    def test_common_error_codes_have_descriptions(self):
        """Verify common error codes have descriptions."""
        common_codes = [
            "0300_4000",  # Z axis homing failed
            "0300_4006",  # Nozzle clogged
            "0300_8004",  # Filament ran out
            "0500_4001",  # Failed to connect to Bambu Cloud
            "0700_8010",  # AMS assist motor overloaded
        ]
        for code in common_codes:
            result = get_error_description(code)
            assert result is not None, f"Missing description for common code: {code}"