"""``replay_input/`` DTOs (AZ-405 / E-DEMO-REPLAY).

Frozen + slotted dataclasses per ADR-002 / module-layout.md so the
composition root and the coordinator can pass these by value without
fear of mutation downstream.

The DTOs come in two flavours:

- :class:`AutoSyncConfig` — operator-tunable thresholds for the
  auto-sync algorithm. The composition root builds an instance from
  ``config.replay.auto_sync`` (owned by AZ-269 / AZ-270) and passes
  it to :class:`ReplayInputAdapter`. Defaults match the contract
  in :mod:`auto_sync` and the AC-1 / AC-2 / AC-3 thresholds.
- :class:`AutoSyncDecision` — the outcome of one auto-sync run. The
  composition root attaches this to the FDR record so an operator can
  audit how the offset was resolved.
- :class:`ReplayInputBundle` — the trio of strategies the composition
  root consumes after :meth:`ReplayInputAdapter.open` returns. The
  bundle also carries the resolved offset so the FDR write at the
  start of the replay run can record provenance.
"""

from __future__ import annotations

from dataclasses import dataclass
from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from gps_denied_onboard._types.fc import FcKind  # noqa: F401  # for docstrings.
    from gps_denied_onboard.clock import Clock
    from gps_denied_onboard.components.c8_fc_adapter.tlog_replay_adapter import (
        TlogReplayFcAdapter,
    )
    from gps_denied_onboard.frame_source.video_file import VideoFileFrameSource


__all__ = [
    "AutoSyncConfig",
    "AutoSyncDecision",
    "ReplayInputBundle",
]


@dataclass(frozen=True, slots=True)
class AutoSyncConfig:
    """Operator-tunable thresholds for the AZ-405 auto-sync algorithm.

    Defaults match the contract in
    ``_docs/02_document/contracts/replay/replay_protocol.md`` v2.0.0
    and the AC-1 / AC-2 / AC-3 thresholds in the AZ-405 spec.

    Attributes:
        takeoff_accel_threshold_g: Sustained vertical-acceleration
            magnitude (in g) above which a tlog sample is considered
            part of a take-off pattern. Default 0.5 (AC-1).
        takeoff_attitude_rate_threshold_rad_s: Sustained attitude-rate
            magnitude (rad/s) above which an ``ATTITUDE`` pair is
            considered part of a take-off pattern. Default 1.0.
        sustained_seconds: Minimum duration both signals must persist
            above their thresholds for a candidate to be accepted.
            Default 0.5.
        prescan_max_messages: Upper bound on tlog messages walked by
            the take-off detector. ~30 s of telemetry at 200 Hz =
            6000 messages, matching the AZ-399 pre-scan budget.
        video_motion_threshold: Mean optical-flow magnitude (pixels)
            above which a video frame pair is considered ``moving``.
            Default 1.5 (calibrated for 720p footage).
        video_motion_scan_seconds: Length of the leading video segment
            inspected for the motion onset. Default 10.0 (AC-4 covers
            an onset at frame 11 of a 60-frame fixture).
        match_threshold_pct: AC-9 frame-window match-percentage
            threshold (default 95.0). Configurable per
            ``config.replay.auto_sync_match_threshold_pct``.
        match_window_ms: AC-9 per-frame matching tolerance in
            milliseconds (default 100).
        low_confidence_threshold: Combined-confidence cut-off below
            which :meth:`ReplayInputAdapter.open` logs WARN and uses
            the best-guess offset (AC-6). Default 0.80.
    """

    takeoff_accel_threshold_g: float = 0.5
    takeoff_attitude_rate_threshold_rad_s: float = 1.0
    sustained_seconds: float = 0.5
    prescan_max_messages: int = 6000
    video_motion_threshold: float = 1.5
    video_motion_scan_seconds: float = 10.0
    match_threshold_pct: float = 95.0
    match_window_ms: int = 100
    low_confidence_threshold: float = 0.80


@dataclass(frozen=True, slots=True)
class AutoSyncDecision:
    """Outcome of one auto-sync run (AZ-405).

    Attributes:
        offset_ms: Resolved offset to be applied to tlog timestamps.
            ``offset_ms = tlog_takeoff_ns - video_motion_onset_ns``
            converted to milliseconds.
        tlog_takeoff_ns: Detected tlog take-off timestamp.
        video_motion_onset_ns: Detected video motion-onset timestamp.
        tlog_confidence: Take-off detector confidence in [0, 1].
        video_confidence: Motion-onset detector confidence in [0, 1].
        combined_confidence: Aggregated confidence in [0, 1]. Below
            :attr:`AutoSyncConfig.low_confidence_threshold` the
            coordinator logs WARN and proceeds (AC-6).
    """

    offset_ms: int
    tlog_takeoff_ns: int
    video_motion_onset_ns: int
    tlog_confidence: float
    video_confidence: float
    combined_confidence: float


@dataclass(frozen=True, slots=True)
class ReplayInputBundle:
    """Trio of strategies returned by :meth:`ReplayInputAdapter.open`.

    The composition root wires the bundle into the same C1–C7 + C13
    pipeline as live (replay protocol Invariant 1 — the components
    see only the standard :class:`FrameSource` / :class:`FcAdapter` /
    :class:`Clock` interfaces past this point).

    Attributes:
        frame_source: :class:`VideoFileFrameSource` instance ready
            for ``next_frame()`` calls.
        fc_adapter: :class:`TlogReplayFcAdapter` instance with its
            decode thread already started by :meth:`open`.
        clock: :class:`TlogDerivedClock` (pace=ASAP) or
            :class:`WallClock` (pace=REALTIME).
        resolved_time_offset_ms: Offset applied to tlog timestamps.
            Equals either the ``manual_time_offset_ms`` constructor
            argument or :attr:`AutoSyncDecision.offset_ms`.
        auto_sync_result: Auto-sync outcome; ``None`` when the
            constructor received an explicit
            ``manual_time_offset_ms``.
    """

    frame_source: "VideoFileFrameSource"
    fc_adapter: "TlogReplayFcAdapter"
    clock: "Clock"
    resolved_time_offset_ms: int
    auto_sync_result: AutoSyncDecision | None