"""Independent short strategy builders.

Short setups are not inverted long setups. They need their own trigger,
confirmation, invalidation and review lineage.
"""

from __future__ import annotations

from app.core.factor_roles import CONFIRMATION, ENTRY, RISK, TRIGGER
from app.core.strategy_contract import StrategySignal, current_strategy_version
from app.core.strategy_registry import BREAKDOWN_RETEST_SHORT_1H_STRATEGY


def _safe_float(value, default=0.0) -> float:
    try:
        if value is None or value == "":
            return default
        return float(value)
    except Exception:
        return default


def build_breakdown_retest_short_1h_signal(
    *,
    symbol: str,
    current_price: float,
    detection: dict,
    entry_plan: dict | None = None,
    market_regime: dict | None = None,
    decision_log: dict | None = None,
) -> StrategySignal | None:
    """Build a short signal for breakdown -> failed retest setups.

    Expected detection fields are intentionally simple so scanner/confirm
    implementations can evolve without changing the strategy contract:
    detected, breakdown_level, retest_zone, stop_level, target_1, quality,
    retest_rejected, score.
    """
    if not (detection or {}).get("detected"):
        return None
    entry_plan = dict(entry_plan or {})
    market_regime = market_regime or {}
    quality = str(detection.get("quality") or "")
    retest_rejected = bool(detection.get("retest_rejected"))
    current_price = _safe_float(current_price)
    retest_zone = _safe_float(detection.get("retest_zone") or detection.get("breakdown_level"))
    distance_pct = abs(current_price / retest_zone - 1) * 100 if current_price > 0 and retest_zone > 0 else 0.0
    risk_level = str(market_regime.get("risk_level") or "medium").lower()
    reasons = []
    status = "candidate"
    if quality not in {"良好", "优质"}:
        status = "observe"
        reasons.append(f"反抽质量 {quality or '未知'}，不直接做空")
    if not retest_rejected:
        status = "observe"
        reasons.append("尚未确认反抽失败")
    if risk_level in {"low", "medium"} and not bool(detection.get("relative_weakness")):
        status = "observe"
        reasons.append("市场并非明显弱势，且缺少相对弱势确认")
    if distance_pct > 8:
        status = "observe"
        reasons.append(f"当前价离反抽区 {distance_pct:.1f}%，不追空")

    entry_plan.setdefault("side", "short")
    entry_plan.setdefault("entry_action", "可即刻买入" if status == "candidate" else "观察")
    entry_plan.setdefault("entry_price", current_price)
    entry_plan.setdefault("stop_loss", detection.get("stop_level"))
    entry_plan.setdefault("tp1", detection.get("target_1"))
    entry_plan.setdefault("risk_reward_ok", True)

    score = _safe_float(detection.get("score"))
    confidence = min(100.0, max(0.0, score * 8 + (12 if retest_rejected else 0)))
    return StrategySignal(
        strategy_code=BREAKDOWN_RETEST_SHORT_1H_STRATEGY,
        strategy_version=current_strategy_version(),
        symbol=symbol,
        direction="short",
        status=status,
        confidence=confidence,
        score=score,
        trigger={
            "factor_code": "breakdown_retest_1h_short",
            "factor_label": "1H破位反抽做空",
            "breakdown_level": detection.get("breakdown_level"),
            "retest_zone": retest_zone,
            "stop_level": detection.get("stop_level"),
            "target_1": detection.get("target_1"),
            "quality": quality,
            "retest_rejected": retest_rejected,
            "distance_to_retest_zone_pct": round(distance_pct, 4),
            "risk_level": risk_level,
        },
        factor_roles={
            "breakdown_retest_1h_short": TRIGGER,
            "retest_reject_15m_short": ENTRY,
            "market_risk_off_short": CONFIRMATION,
            "false_breakout": RISK,
            "funding_extreme": RISK,
        },
        entry_plan=entry_plan,
        risk_plan={
            "invalid_if": ["重新站回破位区", "反抽放量突破", "BTC/ETH快速转强", "RR不足"],
            "risk_reasons": reasons,
        },
        decision_log=decision_log or {
            "module": BREAKDOWN_RETEST_SHORT_1H_STRATEGY,
            "decision": status,
            "reasons": reasons,
        },
    )


__all__ = ["build_breakdown_retest_short_1h_signal"]