"""
API endpoints for the breakout signal monitor.

GET  /api/signal/status          — current state (enabled, recent signals)
POST /api/signal/toggle          — flip the on/off switch (requires X-Ingest-Key)
GET  /api/signal/history         — last N signals (fired regardless of enabled state)
"""

from fastapi import APIRouter, Header, HTTPException
from typing import Optional

from app.config import settings
from app.services.funding_signal import (
    set_enabled,
    is_enabled,
    get_recent_signals,
    get_status,
)

router = APIRouter(prefix="/signal", tags=["signal"])


def _require_ingest_key(x_ingest_key: Optional[str]) -> None:
    """Fail-closed operator-only guard (same pattern as signals.py)."""
    expected = settings.ingest_api_key
    if not expected:
        raise HTTPException(503, "toggle disabled (INGEST_API_KEY not configured)")
    if not x_ingest_key:
        raise HTTPException(401, "missing X-Ingest-Key header")
    if x_ingest_key != expected:
        raise HTTPException(401, "invalid X-Ingest-Key")


@router.get("/status")
async def status():
    return get_status()


@router.post("/toggle")
async def toggle(enabled: bool, x_ingest_key: Optional[str] = Header(default=None)):
    """
    Operator-only toggle — requires X-Ingest-Key header (same secret as signal ingest).
    Example: POST /api/signal/toggle?enabled=true  -H 'X-Ingest-Key: …'
    """
    _require_ingest_key(x_ingest_key)
    set_enabled(enabled)
    return {"enabled": is_enabled()}


@router.get("/history")
async def history(limit: int = 20):
    return get_recent_signals(limit)