"""
Deep behavioral tests for headline_generator.py pure logic.
Tests headline generation patterns, cleaning, and validation.
"""


# --- Headline generation flow ---


class TestHeadlineGenerationFlow:
    """Tests for generate_headline main flow."""

    def _should_try_llm(self):
        # Always try LLM first
        return True

    def test_always_tries_llm(self):
        assert self._should_try_llm() is True


class TestHeadlineFallback:
    """Tests for headline generation failure fallback."""

    def _get_fallback_headline(self):
        return "[Headline generation failed]"

    def test_fallback_message(self):
        result = self._get_fallback_headline()
        assert "failed" in result.lower()

    def test_fallback_bracketed(self):
        result = self._get_fallback_headline()
        assert result.startswith("[")
        assert result.endswith("]")


# --- Headline cleaning ---


class TestHeadlineCleaning:
    """Tests for headline cleanup logic."""

    def _clean_headline(self, headline):
        return headline.strip("\"'.,!?")

    def test_strips_quotes(self):
        assert self._clean_headline('"Headline"') == "Headline"
        assert self._clean_headline("'Headline'") == "Headline"

    def test_strips_periods(self):
        assert self._clean_headline("Headline.") == "Headline"

    def test_strips_commas(self):
        assert self._clean_headline("Headline,") == "Headline"

    def test_strips_exclamation(self):
        assert self._clean_headline("Headline!") == "Headline"

    def test_strips_question(self):
        assert self._clean_headline("Headline?") == "Headline"

    def test_strips_multiple(self):
        assert self._clean_headline('"Headline."') == "Headline"

    def test_preserves_middle(self):
        assert self._clean_headline('A "quoted" B') == 'A "quoted" B'


# --- Headline validation ---


class TestHeadlineValidation:
    """Tests for headline validation."""

    def _is_valid_headline(self, headline):
        return bool(headline and headline.strip())

    def test_valid_headline(self):
        assert self._is_valid_headline("News headline") is True

    def test_empty_string_invalid(self):
        assert self._is_valid_headline("") is False

    def test_none_invalid(self):
        assert self._is_valid_headline(None) is False

    def test_whitespace_only_invalid(self):
        assert self._is_valid_headline("   ") is False


# --- Findings check ---


class TestFindingsCheck:
    """Tests for checking if findings are provided."""

    def _has_findings(self, findings):
        return bool(findings)

    def test_with_findings(self):
        assert self._has_findings("Some findings here") is True

    def test_empty_findings(self):
        assert self._has_findings("") is False

    def test_none_findings(self):
        assert self._has_findings(None) is False


class TestFindingsLogging:
    """Tests for findings length logging."""

    def _get_findings_length(self, findings):
        return len(findings) if findings else 0

    def test_with_findings(self):
        assert self._get_findings_length("abc") == 3

    def test_empty_findings(self):
        assert self._get_findings_length("") == 0

    def test_none_findings(self):
        assert self._get_findings_length(None) == 0


# --- Max length parameter ---


class TestMaxLengthParameter:
    """Tests for max_length parameter handling."""

    def test_default_max_length(self):
        max_length = 100
        assert max_length == 100

    def test_truncate_to_max(self):
        max_length = 100
        headline = "A" * 150
        truncated = headline[:max_length]
        assert len(truncated) == 100


# --- LLM response handling ---


class TestLLMResponseHandling:
    """Tests for handling LLM response content."""

    def _extract_content(self, response):
        return response.get("content", "").strip()

    def test_extracts_content(self):
        response = {"content": "  Generated headline  "}
        result = self._extract_content(response)
        assert result == "Generated headline"

    def test_missing_content(self):
        response = {}
        result = self._extract_content(response)
        assert result == ""


# --- Prompt construction ---


class TestPromptConstruction:
    """Tests for prompt structure requirements."""

    def _prompt_requires_multiple_events(self):
        requirements = [
            "MULTIPLE major events",
            "semicolons or commas",
            "No quotes or punctuation at start/end",
        ]
        return requirements

    def test_has_multiple_events_requirement(self):
        reqs = self._prompt_requires_multiple_events()
        assert any("MULTIPLE" in r for r in reqs)

    def test_has_separator_requirement(self):
        reqs = self._prompt_requires_multiple_events()
        assert any("semicolons" in r for r in reqs)


# --- Temperature setting ---


class TestTemperatureSetting:
    """Tests for LLM temperature setting."""

    def test_low_temperature(self):
        temperature = 0.3
        assert temperature == 0.3

    def test_temperature_for_consistency(self):
        temperature = 0.3
        # Low temperature for more consistent headlines
        assert temperature < 0.5


# --- Findings preview (no truncation) ---


class TestFindingsPreview:
    """Tests for findings preview handling."""

    def _get_findings_preview(self, findings):
        # Use complete findings, no character limit
        return findings

    def test_preserves_all_content(self):
        findings = "A" * 5000
        result = self._get_findings_preview(findings)
        assert len(result) == 5000

    def test_empty_findings(self):
        result = self._get_findings_preview("")
        assert result == ""


# --- Error handling ---


class TestLLMErrorHandling:
    """Tests for LLM error handling."""

    def _handle_llm_error(self, error):
        # Returns None on error
        return None

    def test_returns_none_on_error(self):
        result = self._handle_llm_error(Exception("Test"))
        assert result is None


# --- Headline content validation ---


class TestHeadlineContentValidation:
    """Tests for headline content requirements."""

    def _headline_has_content(self, headline):
        return headline and len(headline.strip()) > 0

    def test_with_content(self):
        assert self._headline_has_content("News headline") is True

    def test_empty_after_clean(self):
        assert self._headline_has_content("...") is True  # Still has dots

    def test_whitespace_only(self):
        assert self._headline_has_content("   ") is False


# --- Complete generation pipeline ---


class TestCompleteGenerationPipeline:
    """Tests for the complete generation flow."""

    def _generate_headline_simplified(self, query, findings, llm_result):
        # Try LLM first
        if llm_result:
            cleaned = llm_result.strip("\"'.,!?")
            if cleaned:
                return cleaned

        # No fallback in current implementation
        return "[Headline generation failed]"

    def test_with_llm_success(self):
        result = self._generate_headline_simplified(
            "query", "findings", '"Great News"'
        )
        assert result == "Great News"

    def test_with_llm_failure(self):
        result = self._generate_headline_simplified("query", "findings", None)
        assert "failed" in result.lower()

    def test_with_empty_llm_result(self):
        result = self._generate_headline_simplified("query", "findings", "")
        assert "failed" in result.lower()


# --- Prompt content requirements ---


class TestPromptContentRequirements:
    """Tests for what the prompt requires."""

    def _get_prompt_requirements(self):
        return {
            "multiple_events": True,
            "specific_locations": True,
            "impacts_and_details": True,
            "no_quotes": True,
            "based_on_findings_only": True,
        }

    def test_requires_multiple_events(self):
        reqs = self._get_prompt_requirements()
        assert reqs["multiple_events"] is True

    def test_requires_specifics(self):
        reqs = self._get_prompt_requirements()
        assert reqs["specific_locations"] is True

    def test_requires_findings_basis(self):
        reqs = self._get_prompt_requirements()
        assert reqs["based_on_findings_only"] is True


# --- Query parameter usage ---


class TestQueryParameterUsage:
    """Tests for query parameter in generation."""

    def test_query_not_used_in_prompt(self):
        # According to code, query is passed but focus is on findings
        query = "original query"
        # The prompt focuses only on findings
        assert query == "original query"
