"""Turn analyze_relationship event_class_split into theme-evidence items.

Punarphoo / romantic_activation stay observation-only. Legal-marriage items
are emitted only when MD/AD hits exist; PD hits never promote that class.
"""

from __future__ import annotations

from typing import Any, Callable


CLAIM_BOUNDARY = (
    "romantic_activation is observation-only and is not legal marriage. "
    "PD hits do not promote an event class. Dasha dates must come from the engine."
)

ThemeEvidence = Callable[..., dict]


def _as_dict(value: Any) -> dict:
    return value if isinstance(value, dict) else {}


def _hits(block: dict) -> list:
    hits = block.get("hits")
    return [item for item in hits] if isinstance(hits, list) else []


def _natal(block: dict) -> list:
    natal = block.get("natal_structure")
    return [item for item in natal] if isinstance(natal, list) else []


def build_event_class_evidence(relationship: dict, theme_evidence: ThemeEvidence) -> list[dict]:
    relationship = relationship if isinstance(relationship, dict) else {}
    split = _as_dict(relationship.get("event_class_split"))
    if not split:
        return []

    pd_hits = split.get("pd_hits") if isinstance(split.get("pd_hits"), list) else []
    items: list[dict] = []

    romantic = _as_dict(split.get("romantic_activation"))
    if _hits(romantic) or _natal(romantic):
        items.append(
            theme_evidence(
                "Romantic-activation",
                "Dasha",
                "心动层（观察）：5L / 7宫月亮 / Punarphoo 只说明感情是否被激活，不能写成领证。",
                "neutral",
                "weak",
                source="relationship.event_class_split",
                details={
                    "event_class": "romantic_activation",
                    "hits": _hits(romantic),
                    "pd_hits": pd_hits,
                    "natal_structure": _natal(romantic),
                    "claim_boundary": CLAIM_BOUNDARY,
                },
            )
        )

    formation = _as_dict(split.get("relationship_formation"))
    if _hits(formation):
        items.append(
            theme_evidence(
                "Relationship-formation",
                "Dasha",
                "成对层：7L / DK / UL 结构进入观察，仍不是法律婚。",
                "neutral",
                "moderate",
                source="relationship.event_class_split",
                details={
                    "event_class": "relationship_formation",
                    "hits": _hits(formation),
                    "pd_hits": pd_hits,
                    "claim_boundary": CLAIM_BOUNDARY,
                },
            )
        )

    legal = _as_dict(split.get("legal_marriage"))
    legal_hits = _hits(legal)
    if legal_hits:
        items.append(
            theme_evidence(
                "Legal-marriage",
                "Dasha",
                "法律婚层：仅 MD/AD 命中 Venus / DK / UL 时列出，PD 命中不升格。",
                "neutral",
                "moderate",
                source="relationship.event_class_split",
                details={
                    "event_class": "legal_marriage",
                    "hits": legal_hits,
                    "pd_hits": pd_hits,
                    "natal_structure": _natal(legal),
                    "claim_boundary": CLAIM_BOUNDARY,
                },
            )
        )
    return items