"""Tests for the unified persona system prompt.

The persona should match the user's configured wake word so renaming the
wake word to e.g. "Friday" produces a butler named Friday, not one still
hardcoded to Jarvis.
"""

from jarvis.system_prompt import build_system_prompt, output_language_directive


class TestBuildSystemPrompt:
    def test_default_name_is_jarvis(self):
        prompt = build_system_prompt()
        assert "named Jarvis" in prompt

    def test_custom_name_replaces_jarvis(self):
        prompt = build_system_prompt("Friday")
        assert "named Friday" in prompt
        assert "named Jarvis" not in prompt

    def test_lowercase_wake_word_is_capitalised(self):
        prompt = build_system_prompt("friday".capitalize())
        assert "named Friday" in prompt

    def test_blank_name_falls_back_to_jarvis(self):
        assert "named Jarvis" in build_system_prompt("")
        assert "named Jarvis" in build_system_prompt("   ")
        assert "named Jarvis" in build_system_prompt(None)  # type: ignore[arg-type]


class TestOutputLanguageDirective:
    """A deployment may lock replies to a single language via OUTPUT_LANGUAGE.

    Unset (the default) must keep the assistant's multilingual behaviour of
    replying in the user's own language, so the helper returns None and no
    directive is injected.
    """

    def test_unset_returns_none(self):
        assert output_language_directive(None) is None
        assert output_language_directive("") is None
        assert output_language_directive("   ") is None

    def test_set_language_is_named_and_exclusive(self):
        directive = output_language_directive("Korean")
        assert directive is not None
        assert "Korean" in directive
        # Must force exclusivity, not merely prefer the language.
        assert "only" in directive.lower()

    def test_language_agnostic(self):
        # The helper takes any language string — no hardcoded single language.
        assert "French" in (output_language_directive("French") or "")
        assert "日本語" in (output_language_directive("日本語") or "")

    def test_strips_surrounding_whitespace(self):
        directive = output_language_directive("  Korean  ")
        assert directive is not None
        assert "Korean" in directive
        assert "  Korean" not in directive