from __future__ import annotations

from collections import Counter
from typing import Any

RELATION_ONTOLOGY = {
    "IS_A",
    "PART_OF",
    "LOCATED_IN",
    "HAS_ROLE",
    "HAS_DATE",
    "HAS_QUANTITY",
    "MENTIONS",
    "ENTAILS",
    "CONTRADICTS",
    "ASSOCIATED_WITH",
    "CAUSES",
    "REPORTS",
    "ATTRIBUTED_TO",
    "TREATS",
    "PREVENTS",
    "INCREASES_RISK",
    "DECREASES_RISK",
}

FACT_FIELDS = ["fact", "source_doc_id", "source_sent_id", "source_text", "confidence"]
TRIPLE_FIELDS = ["head", "relation", "tail", "source_doc_id", "source_sent_id", "source_text", "confidence"]
BIOMED_RELATIONS = {"TREATS", "PREVENTS", "INCREASES_RISK", "DECREASES_RISK"}
HEALTHVER_DIRECT_CUES = {
    "TREATS": {
        "treat",
        "therapy",
        "therapeutic",
        "effective",
        "efficacy",
        "inhibit",
        "inactivat",
        "antiviral",
        "against",
        "used for",
    },
    "PREVENTS": {
        "prevent",
        "prevention",
        "curb",
        "protect",
        "reduce",
        "mitigat",
        "avoid",
        "limit spread",
        "block transmission",
    },
    "INCREASES_RISK": {
        "increase",
        "higher",
        "risk",
        "more likely",
        "severe",
        "worse",
        "mortality",
    },
    "DECREASES_RISK": {
        "decrease",
        "lower",
        "reduced",
        "risk",
        "less likely",
        "protective",
        "mortality reduction",
    },
}


def normalize_relation(value: Any) -> str:
    return str(value or "").strip().upper().replace(" ", "_").replace("-", "_")


def normalize_confidence(value: Any) -> float:
    try:
        score = float(value)
    except (TypeError, ValueError):
        return 0.0
    if score < 0:
        return 0.0
    if score > 1:
        return 1.0
    return score


def source_key(item: dict[str, Any]) -> tuple[str, str]:
    return str(item.get("source_doc_id") or ""), str(item.get("source_sent_id") or "")


def candidate_sources(evidence: list[dict[str, Any]]) -> dict[tuple[str, str], dict[str, Any]]:
    return {source_key(item): item for item in evidence}


def validate_fact(fact: dict[str, Any], sources: dict[tuple[str, str], dict[str, Any]]) -> list[str]:
    errors: list[str] = []
    for field in FACT_FIELDS:
        if fact.get(field) in {None, ""}:
            errors.append(f"missing_{field}")
    if source_key(fact) not in sources:
        errors.append("citation_not_in_candidate_pool")
    return errors


def validate_triple(triple: dict[str, Any], sources: dict[tuple[str, str], dict[str, Any]], dataset: str) -> list[str]:
    errors: list[str] = []
    for field in TRIPLE_FIELDS:
        if triple.get(field) in {None, ""}:
            errors.append(f"missing_{field}")
    relation = normalize_relation(triple.get("relation"))
    if relation not in RELATION_ONTOLOGY:
        errors.append("ontology_violation")
    if dataset == "healthver" and relation in BIOMED_RELATIONS:
        source_text = str(triple.get("source_text") or "").casefold()
        cues = HEALTHVER_DIRECT_CUES.get(relation, set())
        if not any(token in source_text for token in cues):
            errors.append("healthver_biomed_relation_not_direct")
    if source_key(triple) not in sources:
        errors.append("citation_not_in_candidate_pool")
    return errors


def validate_claim_extraction(
    dataset: str,
    evidence: list[dict[str, Any]],
    facts: list[dict[str, Any]],
    triples: list[dict[str, Any]],
    parse_success: bool,
) -> dict[str, Any]:
    sources = candidate_sources(evidence)
    fact_errors = [error for fact in facts for error in validate_fact(fact, sources)]
    triple_errors = [error for triple in triples for error in validate_triple(triple, sources, dataset)]
    citation_errors = sum(1 for error in fact_errors + triple_errors if error == "citation_not_in_candidate_pool")
    ontology_errors = sum(1 for error in triple_errors if error in {"ontology_violation", "healthver_biomed_relation_not_direct"})
    item_count = len(facts) + len(triples)
    return {
        "parse_success": bool(parse_success),
        "facts": len(facts),
        "triples": len(triples),
        "item_count": item_count,
        "citation_valid": max(0, item_count - citation_errors),
        "citation_errors": citation_errors,
        "ontology_errors": ontology_errors,
        "fact_error_counts": dict(Counter(fact_errors)),
        "triple_error_counts": dict(Counter(triple_errors)),
        "claim_subgraph_built": len(triples) > 0,
    }