from __future__ import annotations

from dataclasses import asdict, dataclass

from repo_registry.acceptance.criteria import (
    QualityCriteriaRegistry,
    QualityCriterion,
    load_quality_criteria,
)
from repo_registry.core.models import (
    CandidateCapability,
    CandidateFeature,
    CandidateGraph,
    SourceReference,
)


PROVIDER_ROUTING_CAPABILITY = "Route LLM Requests Across Providers"
BLOCKING_OUTCOMES = {"downgraded", "rejected", "invalidated", "requires_review"}


@dataclass(frozen=True)
class QualityGateOutcome:
    criteria_version: str
    criterion_id: str
    criterion_title: str
    severity: str
    outcome: str
    element_type: str
    element_id: int
    element_name: str
    reason: str


def evaluate_candidate_graph_quality(
    graph: CandidateGraph,
    registry: QualityCriteriaRegistry | None = None,
) -> list[QualityGateOutcome]:
    active_registry = registry or load_quality_criteria()
    outcomes: list[QualityGateOutcome] = []
    for ability in graph.abilities:
        for capability in ability.capabilities:
            outcomes.extend(evaluate_candidate_capability_quality(capability, active_registry))
    return outcomes


def evaluate_candidate_capability_quality(
    capability: CandidateCapability,
    registry: QualityCriteriaRegistry | None = None,
) -> list[QualityGateOutcome]:
    active_registry = registry or load_quality_criteria()
    criteria = {criterion.id: criterion for criterion in active_registry.criteria}
    outcomes: list[QualityGateOutcome] = []
    refs = _capability_refs(capability)

    if not refs:
        outcomes.append(
            _outcome(
                active_registry,
                criteria["RREG-QC-004"],
                element_type="capability",
                element_id=capability.id,
                element_name=capability.name,
                reason="Candidate capability has no source refs supporting the abstraction.",
            )
        )
    elif _all_generated_scope_refs(refs):
        outcomes.append(
            _outcome(
                active_registry,
                criteria["RREG-QC-005"],
                element_type="capability",
                element_id=capability.id,
                element_name=capability.name,
                reason="Candidate is supported only by generated SCOPE.md evidence.",
            )
        )
    elif _all_weak_source_refs(refs):
        outcomes.append(
            _outcome(
                active_registry,
                criteria["RREG-QC-001"],
                element_type="capability",
                element_id=capability.id,
                element_name=capability.name,
                reason="All supporting refs are weak source roles for capability truth.",
            )
        )
        outcomes.append(
            _outcome(
                active_registry,
                criteria["RREG-QC-006"],
                element_type="capability",
                element_id=capability.id,
                element_name=capability.name,
                reason="Candidate is primarily supported by tests, fixtures, schemas, or examples.",
            )
        )

    if _looks_like_provider_routing(capability):
        outcomes.append(
            _outcome(
                active_registry,
                criteria["RREG-QC-002"],
                element_type="capability",
                element_id=capability.id,
                element_name=capability.name,
                reason=(
                    "Provider-routing or LLM-integration vocabulary requires "
                    "explicit product evidence before it can be native utility."
                ),
            )
        )

    for feature in capability.features:
        if _feature_misplaced_under_provider_routing(capability, feature):
            outcomes.append(
                _outcome(
                    active_registry,
                    criteria["RREG-QC-003"],
                    element_type="feature",
                    element_id=feature.id,
                    element_name=feature.name,
                    reason=(
                        "API/CLI surface is nested below provider-routing or "
                        "LLM-integration capability."
                    ),
                )
            )

    return outcomes


def blocking_quality_gate_outcomes(
    outcomes: list[QualityGateOutcome],
) -> list[QualityGateOutcome]:
    return [outcome for outcome in outcomes if outcome.outcome in BLOCKING_OUTCOMES]


def quality_gate_outcome_dicts(
    outcomes: list[QualityGateOutcome],
) -> list[dict[str, object]]:
    return [asdict(outcome) for outcome in outcomes]


def _outcome(
    registry: QualityCriteriaRegistry,
    criterion: QualityCriterion,
    *,
    element_type: str,
    element_id: int,
    element_name: str,
    reason: str,
) -> QualityGateOutcome:
    return QualityGateOutcome(
        criteria_version=registry.criteria_version,
        criterion_id=criterion.id,
        criterion_title=criterion.title,
        severity=criterion.severity,
        outcome=criterion.deterministic_action,
        element_type=element_type,
        element_id=element_id,
        element_name=element_name,
        reason=reason,
    )


def _capability_refs(capability: CandidateCapability) -> list[SourceReference]:
    refs = list(capability.source_refs)
    for feature in capability.features:
        refs.extend(feature.source_refs)
    for evidence in capability.evidence:
        refs.extend(evidence.source_refs)
    return refs


def _looks_like_provider_routing(capability: CandidateCapability) -> bool:
    return (
        capability.name == PROVIDER_ROUTING_CAPABILITY
        or capability.primary_class in {"llm-integration", "provider-routing"}
    )


def _feature_misplaced_under_provider_routing(
    capability: CandidateCapability,
    feature: CandidateFeature,
) -> bool:
    if not _looks_like_provider_routing(capability):
        return False
    return feature.type.upper() in {"API", "CLI"} or feature.primary_class.upper() in {
        "API",
        "CLI",
    }


def _all_generated_scope_refs(refs: list[SourceReference]) -> bool:
    return bool(refs) and all(ref.path.endswith("SCOPE.md") for ref in refs)


def _all_weak_source_refs(refs: list[SourceReference]) -> bool:
    return bool(refs) and all(_is_weak_source_ref(ref) for ref in refs)


def _is_weak_source_ref(ref: SourceReference) -> bool:
    path = ref.path.lower()
    kind = ref.kind.lower()
    return (
        path.startswith("tests/")
        or "/tests/" in path
        or "fixture" in path
        or path.startswith("docs/schemas/")
        or "schema" in kind
        or "example" in kind
        or kind in {"test", "fixture", "schema-example", "generated-scope"}
    )