"""Calibrated fast-path thresholds by document type and event type.

Thresholds represent the minimum calibrated confidence required for
fast-path acceptance. Documents/events below these thresholds are routed
to adjudication. Thresholds are versioned and can be updated as
calibration data improves.
"""

from __future__ import annotations

from dataclasses import dataclass, field

from services.intelligence_pipeline_v3.routing.reasons import RouteDecision

# Default confidence thresholds per document type.
# These are initial conservative values; calibration on the Gold Corpus
# will refine them over time.
DEFAULT_DOCUMENT_THRESHOLDS: dict[str, float] = {
    "article": 0.80,
    "press_release": 0.80,
    "filing": 0.70,
    "transcript": 0.75,
    "macro_event": 0.75,
}

# Default confidence thresholds per event type (override document-type defaults).
DEFAULT_EVENT_THRESHOLDS: dict[str, float] = {
    "earnings_beat": 0.75,
    "earnings_miss": 0.75,
    "guidance_change": 0.65,
    "management_change": 0.70,
    "merger_acquisition": 0.60,
    "regulatory_action": 0.65,
    "product_launch": 0.80,
    "legal_action": 0.65,
    "rating_change": 0.75,
    "supply_chain": 0.70,
}

# Fallback threshold when document_type or event_type is unknown.
DEFAULT_FALLBACK_THRESHOLD: float = 0.80


@dataclass(frozen=True)
class FastPathThresholds:
    """Configuration for fast-path acceptance thresholds.

    Resolution order:
    1. Event-type-specific threshold (if event_type is provided and known).
    2. Document-type-specific threshold.
    3. Fallback threshold.

    Higher thresholds are more conservative (more documents go to adjudication).
    """

    document_thresholds: dict[str, float] = field(
        default_factory=lambda: dict(DEFAULT_DOCUMENT_THRESHOLDS)
    )
    event_thresholds: dict[str, float] = field(
        default_factory=lambda: dict(DEFAULT_EVENT_THRESHOLDS)
    )
    fallback_threshold: float = DEFAULT_FALLBACK_THRESHOLD
    version: str = "1.0.0"

    def resolve_threshold(
        self,
        document_type: str,
        event_type: str | None = None,
    ) -> float:
        """Resolve the applicable threshold for a document/event combination.

        Parameters
        ----------
        document_type:
            The document type (article, filing, transcript, etc.).
        event_type:
            Optional event type detected in the document.

        Returns
        -------
        float
            The minimum calibrated confidence required for fast-path acceptance.
        """
        # Event-type threshold takes priority when available
        if event_type and event_type in self.event_thresholds:
            return self.event_thresholds[event_type]

        # Document-type threshold
        if document_type in self.document_thresholds:
            return self.document_thresholds[document_type]

        # Fallback
        return self.fallback_threshold


def evaluate_thresholds(
    confidence: float,
    document_type: str,
    event_type: str | None,
    thresholds: FastPathThresholds,
) -> RouteDecision:
    """Evaluate whether calibrated confidence meets the fast-path threshold.

    Parameters
    ----------
    confidence:
        Calibrated confidence score (0.0 to 1.0).
    document_type:
        The document type being processed.
    event_type:
        Optional event type detected in the document.
    thresholds:
        Threshold configuration to use.

    Returns
    -------
    RouteDecision
        FAST_PATH if confidence >= threshold, ADJUDICATION otherwise.

    Notes
    -----
    The comparison uses ``>=`` (greater-than-or-equal). A confidence value
    exactly at the threshold is accepted on the fast path. This boundary
    behavior is deterministic and tested by property tests.
    """
    threshold = thresholds.resolve_threshold(document_type, event_type)

    if confidence >= threshold:
        return RouteDecision.FAST_PATH
    return RouteDecision.ADJUDICATION