"""Tests for citation_backfill.py — article/paragraph enrichment."""
import hashlib
import json
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from compliance.services.citation_backfill import (
    CitationBackfill,
    MatchResult,
    _parse_concatenated_source,
    _parse_json,
)
from compliance.services.rag_client import RAGSearchResult


# =============================================================================
# Unit tests: _parse_concatenated_source
# =============================================================================


class TestParseConcatenatedSource:
    def test_dsgvo_art(self):
        result = _parse_concatenated_source("DSGVO Art. 35")
        assert result == {"name": "DSGVO", "article": "Art. 35"}

    def test_nis2_artikel(self):
        result = _parse_concatenated_source("NIS2 Artikel 21 Abs. 2")
        assert result == {"name": "NIS2", "article": "Artikel 21 Abs. 2"}

    def test_long_name_with_article(self):
        result = _parse_concatenated_source("Verordnung (EU) 2024/1689 (KI-Verordnung) Art. 6")
        assert result == {"name": "Verordnung (EU) 2024/1689 (KI-Verordnung)", "article": "Art. 6"}

    def test_paragraph_sign(self):
        result = _parse_concatenated_source("BDSG § 42")
        assert result == {"name": "BDSG", "article": "§ 42"}

    def test_paragraph_sign_with_abs(self):
        result = _parse_concatenated_source("TTDSG § 25 Abs. 1")
        assert result == {"name": "TTDSG", "article": "§ 25 Abs. 1"}

    def test_no_article(self):
        result = _parse_concatenated_source("DSGVO")
        assert result is None

    def test_empty_string(self):
        result = _parse_concatenated_source("")
        assert result is None

    def test_none(self):
        result = _parse_concatenated_source(None)
        assert result is None

    def test_just_name_no_article(self):
        result = _parse_concatenated_source("Cyber Resilience Act")
        assert result is None


# =============================================================================
# Unit tests: _parse_json
# =============================================================================


class TestParseJson:
    def test_direct_json(self):
        result = _parse_json('{"article": "Art. 35", "paragraph": "Abs. 1"}')
        assert result == {"article": "Art. 35", "paragraph": "Abs. 1"}

    def test_markdown_code_block(self):
        raw = '```json\n{"article": "§ 42", "paragraph": ""}\n```'
        result = _parse_json(raw)
        assert result == {"article": "§ 42", "paragraph": ""}

    def test_text_with_json(self):
        raw = 'Der Artikel ist {"article": "Art. 6", "paragraph": "Abs. 2"} wie beschrieben.'
        result = _parse_json(raw)
        assert result == {"article": "Art. 6", "paragraph": "Abs. 2"}

    def test_empty(self):
        assert _parse_json("") is None
        assert _parse_json(None) is None

    def test_no_json(self):
        assert _parse_json("Das ist kein JSON.") is None


# =============================================================================
# Integration tests: CitationBackfill matching
# =============================================================================


def _make_rag_chunk(text="Test text", article="Art. 35", paragraph="Abs. 1",
                     regulation_code="eu_2016_679", regulation_name="DSGVO"):
    return RAGSearchResult(
        text=text,
        regulation_code=regulation_code,
        regulation_name=regulation_name,
        regulation_short="DSGVO",
        category="datenschutz",
        article=article,
        paragraph=paragraph,
        source_url="https://example.com",
        score=0.0,
        collection="bp_compliance_gesetze",
    )


class TestCitationBackfillMatching:
    def setup_method(self):
        self.db = MagicMock()
        self.rag = MagicMock()
        self.backfill = CitationBackfill(db=self.db, rag_client=self.rag)

    @pytest.mark.asyncio
    async def test_hash_match(self):
        """Tier 1: exact text hash matches a RAG chunk."""
        source_text = "Dies ist ein Gesetzestext mit spezifischen Anforderungen an die Datensicherheit."
        chunk = _make_rag_chunk(text=source_text, article="Art. 32", paragraph="Abs. 1")
        h = hashlib.sha256(source_text.encode()).hexdigest()
        self.backfill._rag_index = {h: chunk}

        ctrl = {
            "control_id": "DATA-001",
            "source_original_text": source_text,
            "source_citation": {"source": "DSGVO Art. 32"},
            "generation_metadata": {"source_regulation": "eu_2016_679"},
        }

        result = await self.backfill._match_control(ctrl)
        assert result is not None
        assert result.method == "hash"
        assert result.article == "Art. 32"
        assert result.paragraph == "Abs. 1"

    @pytest.mark.asyncio
    async def test_regex_match(self):
        """Tier 2: regex parses concatenated source when no hash match."""
        self.backfill._rag_index = {}

        ctrl = {
            "control_id": "NET-010",
            "source_original_text": None,  # No original text available
            "source_citation": {"source": "NIS2 Artikel 21"},
            "generation_metadata": {},
        }

        result = await self.backfill._match_control(ctrl)
        assert result is not None
        assert result.method == "regex"
        assert result.article == "Artikel 21"

    @pytest.mark.asyncio
    async def test_llm_match(self):
        """Tier 3: Ollama LLM identifies article/paragraph."""
        self.backfill._rag_index = {}

        ctrl = {
            "control_id": "AUTH-005",
            "source_original_text": "Verantwortliche muessen geeignete technische Massnahmen treffen...",
            "source_citation": {"source": "DSGVO"},  # No article in source
            "generation_metadata": {"source_regulation": "eu_2016_679"},
        }

        with patch("compliance.services.citation_backfill._llm_ollama", new_callable=AsyncMock) as mock_llm:
            mock_llm.return_value = '{"article": "Art. 25", "paragraph": "Abs. 1"}'
            result = await self.backfill._match_control(ctrl)

        assert result is not None
        assert result.method == "llm"
        assert result.article == "Art. 25"
        assert result.paragraph == "Abs. 1"

    @pytest.mark.asyncio
    async def test_no_match(self):
        """No match when no source text and no parseable source."""
        self.backfill._rag_index = {}

        ctrl = {
            "control_id": "SEC-001",
            "source_original_text": None,
            "source_citation": {"source": "Unknown Source"},
            "generation_metadata": {},
        }

        result = await self.backfill._match_control(ctrl)
        assert result is None

    def test_update_control_cleans_source(self):
        """_update_control splits concatenated source and adds article/paragraph."""
        ctrl = {
            "id": "test-uuid-123",
            "control_id": "DATA-001",
            "source_citation": {"source": "DSGVO Art. 32", "license": "EU_LAW"},
            "generation_metadata": {"processing_path": "structured"},
        }
        match = MatchResult(article="Art. 32", paragraph="Abs. 1", method="hash")

        self.backfill._update_control(ctrl, match)

        call_args = self.db.execute.call_args
        params = call_args[1] if call_args[1] else call_args[0][1]
        citation = json.loads(params["citation"])
        metadata = json.loads(params["metadata"])

        assert citation["source"] == "DSGVO"  # Cleaned: article removed
        assert citation["article"] == "Art. 32"
        assert citation["paragraph"] == "Abs. 1"
        assert metadata["source_paragraph"] == "Abs. 1"
        assert metadata["backfill_method"] == "hash"
        assert "backfill_at" in metadata

    def test_rule3_not_loaded(self):
        """Verify the SQL query only loads Rule 1+2 controls."""
        # Simulate what _load_controls_needing_backfill does
        self.db.execute.return_value = MagicMock(keys=lambda: [], __iter__=lambda s: iter([]))
        self.backfill._load_controls_needing_backfill()

        sql_text = str(self.db.execute.call_args[0][0].text)
        assert "license_rule IN (1, 2)" in sql_text
        assert "source_citation IS NOT NULL" in sql_text


# =============================================================================
# Tests: Ollama JSON-Mode
# =============================================================================


class TestOllamaJsonMode:
    """Verify that citation_backfill Ollama payloads include format=json."""

    @pytest.mark.asyncio
    async def test_ollama_payload_contains_format_json(self):
        """_llm_ollama must send format='json' in the request payload."""
        from compliance.services.citation_backfill import _llm_ollama

        mock_response = MagicMock()
        mock_response.status_code = 200
        mock_response.json.return_value = {
            "message": {"content": '{"article": "Art. 1"}'}
        }

        with patch("compliance.services.citation_backfill.httpx.AsyncClient") as mock_cls:
            mock_client = AsyncMock()
            mock_client.post.return_value = mock_response
            mock_cls.return_value.__aenter__ = AsyncMock(return_value=mock_client)
            mock_cls.return_value.__aexit__ = AsyncMock(return_value=False)

            await _llm_ollama("test prompt", "system prompt")

            mock_client.post.assert_called_once()
            call_kwargs = mock_client.post.call_args
            payload = call_kwargs.kwargs.get("json") or call_kwargs[1].get("json")
            assert payload["format"] == "json"