"""
Instrument Models Router — graphes causaux exhaustifs par instrument.
"""
from typing import Any, Dict, List, Optional
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel

router = APIRouter(prefix="/api/instrument-models", tags=["instrument-models"])


class OverrideBody(BaseModel):
    value: float
    note: Optional[str] = ""


class BulkOverrideItem(BaseModel):
    node_id: str
    value: float
    note: Optional[str] = ""


class BulkOverrideBody(BaseModel):
    overrides: List[BulkOverrideItem]


@router.get("", response_model=List[Dict[str, Any]])
def list_instrument_models():
    from services.database import get_conn
    from services.instrument_models import INSTRUMENT_MODELS
    conn = get_conn()
    try:
        rows = conn.execute(
            "SELECT instrument, updated_at FROM instrument_models ORDER BY instrument"
        ).fetchall()
        result = []
        for r in rows:
            inst = r["instrument"]
            meta = INSTRUMENT_MODELS.get(inst, {})
            counts: dict[str, int] = {}
            for n in meta.get("nodes", []):
                t = n.get("node_type", "unknown")
                counts[t] = counts.get(t, 0) + 1
            result.append({
                "instrument": inst,
                "name": meta.get("name", inst),
                "description": meta.get("description", ""),
                "n_input_event":  counts.get("input_event", 0),
                "n_input_manual": counts.get("input_manual", 0),
                "n_intermediate": counts.get("intermediate", 0),
                "updated_at": r["updated_at"],
            })
        return result
    finally:
        conn.close()


@router.get("/{instrument}/gauge-suggestions")
def get_gauge_suggestions(instrument: str) -> Dict[str, Any]:
    """Suggestions de valeurs depuis les derniers gauges de marché (macro_regime_history)."""
    from services.database import get_conn
    from services.gauge_sync import suggest_from_gauges, get_latest_gauges
    from services.instrument_models import INSTRUMENT_MODELS
    conn = get_conn()
    try:
        inst = instrument.upper()
        if inst not in INSTRUMENT_MODELS:
            raise HTTPException(status_code=404, detail=f"Instrument {inst} non supporté")
        gauges, snap_date = get_latest_gauges(conn)
        if not gauges:
            raise HTTPException(status_code=404, detail="Aucun snapshot de gauges disponible")
        suggestions = suggest_from_gauges(inst, gauges)
        # Enrich with node label/unit from graph if missing
        return {
            "instrument":    inst,
            "gauge_date":    snap_date,
            "n_suggestions": len(suggestions),
            "suggestions":   suggestions,
            "gauges_available": list(gauges.keys()),
        }
    finally:
        conn.close()


@router.post("/{instrument}/apply-suggestions")
def apply_gauge_suggestions(
    instrument: str,
    body: BulkOverrideBody,
) -> Dict[str, Any]:
    """Applique une liste d'overrides en bulk (depuis gauge sync ou saisie rapide)."""
    from services.database import get_conn
    from services.instrument_models import set_node_override
    conn = get_conn()
    try:
        inst = instrument.upper()
        saved = []
        for item in body.overrides:
            set_node_override(conn, inst, item.node_id, item.value, item.note or "")
            saved.append(item.node_id)
        return {"ok": True, "instrument": inst, "saved": saved, "count": len(saved)}
    finally:
        conn.close()


@router.delete("/{instrument}/overrides")
def clear_all_overrides(instrument: str) -> Dict[str, Any]:
    """Supprime TOUTES les overrides d'un instrument (reset à zéro)."""
    from services.database import get_conn
    conn = get_conn()
    try:
        inst = instrument.upper()
        conn.execute("DELETE FROM instrument_node_overrides WHERE instrument=?", (inst,))
        conn.commit()
        return {"ok": True, "instrument": inst}
    finally:
        conn.close()


@router.get("/{instrument}/regime")
def get_instrument_regime(
    instrument: str,
    at_date: Optional[str] = Query(None),
) -> Dict[str, Any]:
    """Régime de marché courant pour cet instrument (détecté depuis events actifs)."""
    from services.database import get_conn
    from services.instrument_models import _compute_event_by_category, detect_regime
    from datetime import datetime, date as date_type
    conn = get_conn()
    try:
        try:
            ref_date = date_type.fromisoformat(at_date) if at_date else datetime.utcnow().date()
        except ValueError:
            ref_date = datetime.utcnow().date()
        ev_by_cat = _compute_event_by_category(conn, instrument.upper(), ref_date)
        return detect_regime(ev_by_cat)
    finally:
        conn.close()


@router.get("/{instrument}/timeline")
def get_instrument_timeline(
    instrument: str,
    period: str = Query("1y", description="5d|1mo|3mo|6mo|1y|2y"),
) -> List[Dict[str, Any]]:
    """Simulation jour par jour de tous les nœuds du modèle sur la période."""
    from services.database import get_conn
    from services.instrument_models import simulate_timeline
    conn = get_conn()
    try:
        data = simulate_timeline(conn, instrument.upper(), period)
        if not data:
            raise HTTPException(status_code=404, detail=f"Modèle introuvable pour {instrument.upper()}")
        return data
    finally:
        conn.close()


@router.get("/{instrument}")
def get_instrument_model(
    instrument: str,
    at_date: Optional[str] = Query(None, description="YYYY-MM-DD (défaut: aujourd'hui)"),
) -> Dict[str, Any]:
    """Graphe complet avec valeurs courantes des nœuds (toutes couches)."""
    from services.database import get_conn
    from services.instrument_models import get_model_state
    conn = get_conn()
    try:
        state = get_model_state(conn, instrument.upper(), at_date)
        if not state:
            raise HTTPException(status_code=404, detail=f"Modèle introuvable pour {instrument.upper()}")
        return state
    finally:
        conn.close()


@router.put("/{instrument}/nodes/{node_id}/override")
def set_override(instrument: str, node_id: str, body: OverrideBody) -> Dict[str, Any]:
    """Définit ou met à jour la valeur manuelle d'un nœud."""
    from services.database import get_conn
    from services.instrument_models import set_node_override
    conn = get_conn()
    try:
        set_node_override(conn, instrument.upper(), node_id, body.value, body.note or "")
        return {"ok": True, "instrument": instrument.upper(), "node_id": node_id, "value": body.value}
    finally:
        conn.close()


@router.delete("/{instrument}/nodes/{node_id}/override")
def clear_override(instrument: str, node_id: str) -> Dict[str, Any]:
    """Supprime l'override manuel d'un nœud (retour neutre/events)."""
    from services.database import get_conn
    from services.instrument_models import clear_node_override
    conn = get_conn()
    try:
        clear_node_override(conn, instrument.upper(), node_id)
        return {"ok": True, "instrument": instrument.upper(), "node_id": node_id}
    finally:
        conn.close()


@router.get("/{instrument}/nodes/overrides")
def get_all_overrides(instrument: str) -> List[Dict[str, Any]]:
    """Toutes les overrides manuelles pour un instrument."""
    from services.database import get_conn
    conn = get_conn()
    try:
        rows = conn.execute(
            "SELECT node_id, value, note, set_at FROM instrument_node_overrides WHERE instrument=? ORDER BY set_at DESC",
            (instrument.upper(),)
        ).fetchall()
        return [dict(r) for r in rows]
    finally:
        conn.close()