"""
Unit Tests für normalization_engine.py (Phase 2)

Run with: PYTHONPATH=./backend pytest tests/backend/test_phase2_normalization.py -v
"""
import pytest
from workflow_models import SignalStatus
from normalization_engine import (
    normalize_decision_signal,
    apply_synonym_mapping,
    normalize_all_signals
)


# ── normalize_decision_signal Tests ────────────────────────────────────────────

def test_exact_match():
    """Test: Exakte Übereinstimmung mit Spektrum → valid"""
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="ja",
        answer_spectrum=["ja", "nein", "unklar"]
    )
    assert signal.status == SignalStatus.VALID
    assert signal.normalized_value == "ja"
    assert signal.raw_value == "ja"


def test_case_insensitive_uppercase():
    """Test: Case-insensitive Matching (Großbuchstaben) → normalized"""
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="JA",
        answer_spectrum=["ja", "nein", "unklar"]
    )
    assert signal.status == SignalStatus.NORMALIZED
    assert signal.normalized_value == "ja"
    assert signal.metadata["method"] == "case_insensitive"


def test_case_insensitive_mixed():
    """Test: Case-insensitive Matching (Mixed Case) → normalized"""
    signal = normalize_decision_signal(
        question_type="prioritaet",
        raw_value="Hoch",
        answer_spectrum=["hoch", "mittel", "niedrig"]
    )
    assert signal.status == SignalStatus.NORMALIZED
    assert signal.normalized_value == "hoch"


def test_synonym_mapping_simple():
    """Test: Synonym-Mapping → normalized"""
    rules = {"synonyms": {"ja": ["yes", "Yes", "YES"]}}
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="yes",
        answer_spectrum=["ja", "nein"],
        normalization_rules=rules
    )
    assert signal.status == SignalStatus.NORMALIZED
    assert signal.normalized_value == "ja"
    assert signal.metadata["method"] == "synonym"


def test_synonym_mapping_case_insensitive():
    """Test: Synonym-Mapping mit case-insensitive → normalized"""
    rules = {"synonyms": {"ja": ["yes"]}}
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="YES",
        answer_spectrum=["ja", "nein"],
        normalization_rules=rules
    )
    assert signal.status == SignalStatus.NORMALIZED
    assert signal.normalized_value == "ja"


def test_invalid_value():
    """Test: Wert außerhalb des Spektrums → invalid"""
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="vielleicht",
        answer_spectrum=["ja", "nein", "unklar"]
    )
    assert signal.status == SignalStatus.INVALID
    assert signal.normalized_value is None


def test_whitespace_handling():
    """Test: Whitespace wird getrimmt → normalized"""
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="  ja  ",
        answer_spectrum=["ja", "nein"]
    )
    assert signal.status == SignalStatus.NORMALIZED  # Wegen strip()
    assert signal.normalized_value == "ja"


def test_synonym_no_match():
    """Test: Synonym-Rules vorhanden, aber kein Match → invalid"""
    rules = {"synonyms": {"ja": ["yes"], "nein": ["no"]}}
    signal = normalize_decision_signal(
        question_type="relevanz",
        raw_value="maybe",
        answer_spectrum=["ja", "nein"],
        normalization_rules=rules
    )
    assert signal.status == SignalStatus.INVALID


# ── apply_synonym_mapping Tests ────────────────────────────────────────────────

def test_apply_synonym_exact():
    """Test: Exakte Synonym-Übereinstimmung"""
    synonyms = {"ja": ["yes", "Yes"], "nein": ["no", "No"]}
    result = apply_synonym_mapping("yes", synonyms)
    assert result == "ja"


def test_apply_synonym_case_insensitive():
    """Test: Case-insensitive Synonym-Matching"""
    synonyms = {"ja": ["yes"], "nein": ["no"]}
    result = apply_synonym_mapping("YES", synonyms)
    assert result == "ja"


def test_apply_synonym_no_match():
    """Test: Kein Synonym-Match → None"""
    synonyms = {"ja": ["yes"], "nein": ["no"]}
    result = apply_synonym_mapping("vielleicht", synonyms)
    assert result is None


def test_apply_synonym_whitespace():
    """Test: Synonym mit Whitespace"""
    synonyms = {"ja": ["yes"]}
    result = apply_synonym_mapping("  yes  ", synonyms)
    assert result == "ja"


# ── normalize_all_signals Tests ────────────────────────────────────────────────

def test_normalize_all_signals_basic():
    """Test: Mehrere Signale normalisieren"""
    signals = {
        "relevanz": "ja",
        "prioritaet": "HOCH"
    }
    catalog = {
        "relevanz": {"answer_spectrum": ["ja", "nein"], "normalization_rules": None},
        "prioritaet": {"answer_spectrum": ["hoch", "mittel", "niedrig"], "normalization_rules": None}
    }

    normalized = normalize_all_signals(signals, catalog)

    assert len(normalized) == 2
    assert normalized[0].question_type == "relevanz"
    assert normalized[0].status == SignalStatus.VALID
    assert normalized[1].question_type == "prioritaet"
    assert normalized[1].status == SignalStatus.NORMALIZED


def test_normalize_all_signals_with_synonyms():
    """Test: Normalisierung mit Synonymen"""
    signals = {
        "relevanz": "yes",
        "prioritaet": "high"
    }
    catalog = {
        "relevanz": {
            "answer_spectrum": ["ja", "nein"],
            "normalization_rules": {"synonyms": {"ja": ["yes"], "nein": ["no"]}}
        },
        "prioritaet": {
            "answer_spectrum": ["hoch", "mittel", "niedrig"],
            "normalization_rules": {"synonyms": {"hoch": ["high"], "niedrig": ["low"]}}
        }
    }

    normalized = normalize_all_signals(signals, catalog)

    assert len(normalized) == 2
    assert normalized[0].normalized_value == "ja"
    assert normalized[1].normalized_value == "hoch"


def test_normalize_all_signals_not_in_catalog():
    """Test: Question type nicht im Katalog → not_decidable"""
    signals = {"unknown_type": "value"}
    catalog = {"relevanz": {"answer_spectrum": ["ja", "nein"], "normalization_rules": None}}

    normalized = normalize_all_signals(signals, catalog)

    assert len(normalized) == 1
    assert normalized[0].status == SignalStatus.NOT_DECIDABLE
    assert normalized[0].metadata["error"] == "not_in_catalog"


def test_normalize_all_signals_mixed_validity():
    """Test: Gemischte Gültigkeit (valid, normalized, invalid)"""
    signals = {
        "relevanz": "ja",           # valid
        "prioritaet": "HOCH",       # normalized (case)
        "selektion": "vielleicht"   # invalid
    }
    catalog = {
        "relevanz": {"answer_spectrum": ["ja", "nein"], "normalization_rules": None},
        "prioritaet": {"answer_spectrum": ["hoch", "mittel", "niedrig"], "normalization_rules": None},
        "selektion": {"answer_spectrum": ["ja", "nein"], "normalization_rules": None}
    }

    normalized = normalize_all_signals(signals, catalog)

    assert len(normalized) == 3
    assert normalized[0].status == SignalStatus.VALID
    assert normalized[1].status == SignalStatus.NORMALIZED
    assert normalized[2].status == SignalStatus.INVALID


def test_normalize_all_signals_empty():
    """Test: Leere Signal-Liste"""
    normalized = normalize_all_signals({}, {})
    assert len(normalized) == 0


if __name__ == "__main__":
    pytest.main([__file__, "-v"])