from fastapi import APIRouter, Depends, HTTPException, Request, BackgroundTasks, Header
from fastapi.encoders import jsonable_encoder
from sqlalchemy.orm import Session
from app.models.infrastructure_intents import InfrastructureIntentRequest
from app.services.intent_adapter import to_oss_intent
from app.services.risk_service import evaluate_intent, evaluate_healing_decision
from app.services.intent_store import save_evaluated_intent
from app.services.outcome_service import record_outcome
from app.api.deps import get_db
from pydantic import BaseModel
import uuid
import logging
import time
from typing import Optional

from agentic_reliability_framework.core.models.event import ReliabilityEvent

# ===== USAGE TRACKER IMPORTS =====
import app.core.usage_tracker
from app.core.usage_tracker import UsageRecord

# ===== PRICING CALCULATOR INTEGRATION =====
try:
    from arf_pricing_calculator.storage.buffer import add_event
    PRICING_AVAILABLE = True
except ImportError:
    PRICING_AVAILABLE = False
    add_event = None

# ===== OpenTelemetry (optional) =====
try:
    from opentelemetry import trace
    from opentelemetry.trace import Status, StatusCode
    _tracer = trace.get_tracer(__name__)
    OTEL_AVAILABLE = True
except ImportError:
    OTEL_AVAILABLE = False
    _tracer = None

logger = logging.getLogger(__name__)
router = APIRouter()


class OutcomeRequest(BaseModel):
    deterministic_id: str
    success: bool
    recorded_by: str
    notes: str = ""


class HealingDecisionRequest(BaseModel):
    event: ReliabilityEvent


@router.post("/intents/evaluate")
async def evaluate_intent_endpoint(
    request: Request,
    intent_req: InfrastructureIntentRequest,
    background_tasks: BackgroundTasks,
    db: Session = Depends(get_db),
    idempotency_key: Optional[str] = Header(None, alias="Idempotency-Key"),
):
    """
    Evaluate an infrastructure intent with idempotency and atomic quota consumption.
    """
    # ── optional trace ──────────────────────────────────────
    span = None
    if OTEL_AVAILABLE and _tracer:
        span = _tracer.start_span("governance.evaluate_intent")
        span.set_attribute("intent_type", intent_req.intent_type)
        span.set_attribute("environment", str(intent_req.environment))

    start_time = time.time()
    api_key = request.headers.get("Authorization", "").replace("Bearer ", "")
    if not api_key:
        api_key = request.query_params.get("api_key", "unknown")

    current_tracker = app.core.usage_tracker.tracker
    if current_tracker is None:
        if span:
            span.set_status(Status(StatusCode.ERROR, "tracker unavailable"))
            span.end()
        raise HTTPException(status_code=503,
                            detail="Usage tracking service unavailable")

    record = UsageRecord(
        api_key=api_key,
        tier=None,
        timestamp=start_time,
        endpoint="/api/v1/intents/evaluate",
        request_body=intent_req.model_dump(),
        processing_ms=None,
    )
    success, existing_response = current_tracker.consume_quota_and_log(
        record=record,
        idempotency_key=idempotency_key
    )
    if not success:
        if span:
            span.set_attribute("idempotent_hit", True if existing_response else False)
            span.end()
        if existing_response:
            return existing_response
        else:
            raise HTTPException(status_code=429,
                                detail="Monthly evaluation quota exceeded")

    try:
        oss_intent = to_oss_intent(intent_req)
        risk_engine = request.app.state.risk_engine
        result = evaluate_intent(
            engine=risk_engine,
            intent=oss_intent,
            cost_estimate=intent_req.estimated_cost,
            policy_violations=intent_req.policy_violations
        )

        if span:
            span.set_attribute("risk_score", result["risk_score"])
            span.set_attribute("deterministic_id", str(uuid.uuid4()))  # will be overwritten later, but fine for trace

        deterministic_id = str(uuid.uuid4())
        api_payload = jsonable_encoder(intent_req.model_dump())
        oss_payload = jsonable_encoder(oss_intent.model_dump())

        save_evaluated_intent(
            db=db,
            deterministic_id=deterministic_id,
            intent_type=intent_req.intent_type,
            api_payload=api_payload,
            oss_payload=oss_payload,
            environment=str(intent_req.environment),
            risk_score=result["risk_score"]
        )

        result["intent_id"] = deterministic_id
        response_data = result

        if current_tracker:
            background_tasks.add_task(
                current_tracker._insert_audit_log,
                UsageRecord(
                    api_key=api_key,
                    tier=None,
                    timestamp=time.time(),
                    endpoint="/api/v1/intents/evaluate/response",
                    request_body=None,
                    response=response_data,
                    processing_ms=(time.time() - start_time) * 1000,
                )
            )

        if span:
            span.set_attribute("intent_id", deterministic_id)
            span.set_status(Status(StatusCode.OK))
            span.end()

        return response_data

    except HTTPException:
        if span:
            span.set_status(Status(StatusCode.ERROR, "HTTP exception"))
            span.end()
        raise
    except Exception as e:
        error_msg = str(e)
        logger.exception("Error in evaluate_intent_endpoint")
        if span:
            span.set_status(Status(StatusCode.ERROR, error_msg))
            span.record_exception(e)
            span.end()
        raise HTTPException(status_code=500, detail=error_msg)


@router.post("/intents/outcome")
async def record_outcome_endpoint(
    request: Request,
    outcome: OutcomeRequest,
    db: Session = Depends(get_db),
    idempotency_key: Optional[str] = Header(None, alias="Idempotency-Key"),
):
    """
    Record an outcome for a previously evaluated intent.
    Idempotent based on deterministic_id and success value (handled in service).
    Also updates the pricing calculator's calibration buffer if available.
    """
    try:
        risk_engine = request.app.state.risk_engine
        outcome_record = record_outcome(
            db=db,
            deterministic_id=outcome.deterministic_id,
            success=outcome.success,
            recorded_by=outcome.recorded_by,
            notes=outcome.notes,
            risk_engine=risk_engine,
            idempotency_key=idempotency_key,
        )

        if PRICING_AVAILABLE and add_event is not None:
            try:
                event = {
                    "run_id": outcome.deterministic_id,
                    "outcome": "success" if outcome.success else "failure",
                    "recorded_at": time.time(),
                    "source": "arf_api_outcome"
                }
                add_event(event)
                logger.info(
                    f"Added outcome to pricing buffer for intent {
                        outcome.deterministic_id}")
            except Exception as e:
                logger.warning(
                    f"Failed to update pricing buffer for intent {
                        outcome.deterministic_id}: {e}")

        return {"message": "Outcome recorded", "outcome_id": outcome_record.id}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/healing/evaluate")
async def evaluate_healing_decision_endpoint(
    request: Request,
    decision_req: HealingDecisionRequest,
    background_tasks: BackgroundTasks,
    idempotency_key: Optional[str] = Header(None, alias="Idempotency-Key"),
):
    """
    Evaluate a healing decision with idempotency and atomic quota consumption.
    """
    # ── optional trace ──────────────────────────────────────
    span = None
    if OTEL_AVAILABLE and _tracer:
        span = _tracer.start_span("governance.evaluate_healing")
        span.set_attribute("component", decision_req.event.component)

    start_time = time.time()
    api_key = request.headers.get("Authorization", "").replace("Bearer ", "")
    if not api_key:
        api_key = request.query_params.get("api_key", "unknown")

    current_tracker = app.core.usage_tracker.tracker
    if current_tracker is None:
        if span:
            span.set_status(Status(StatusCode.ERROR, "tracker unavailable"))
            span.end()
        raise HTTPException(status_code=503,
                            detail="Usage tracking service unavailable")

    record = UsageRecord(
        api_key=api_key,
        tier=None,
        timestamp=start_time,
        endpoint="/api/v1/healing/evaluate",
        request_body=decision_req.model_dump(),
        processing_ms=None,
    )
    success, existing_response = current_tracker.consume_quota_and_log(
        record=record,
        idempotency_key=idempotency_key
    )
    if not success:
        if span:
            span.set_attribute("idempotent_hit", True if existing_response else False)
            span.end()
        if existing_response:
            return existing_response
        else:
            raise HTTPException(status_code=429,
                                detail="Monthly evaluation quota exceeded")

    try:
        policy_engine = request.app.state.policy_engine
        rag_graph = getattr(request.app.state, "rag_graph", None)
        model = getattr(request.app.state, "epistemic_model", None)
        tokenizer = getattr(request.app.state, "epistemic_tokenizer", None)

        response_data = evaluate_healing_decision(
            event=decision_req.event,
            policy_engine=policy_engine,
            decision_engine=None,
            rag_graph=rag_graph,
            model=model,
            tokenizer=tokenizer,
        )

        if span:
            span.set_attribute("risk_score", response_data.get("risk_score", 0.0))
            span.set_attribute("selected_action", response_data.get("selected_action", "unknown"))
            span.set_status(Status(StatusCode.OK))
            span.end()

        if current_tracker:
            background_tasks.add_task(
                current_tracker._insert_audit_log,
                UsageRecord(
                    api_key=api_key,
                    tier=None,
                    timestamp=time.time(),
                    endpoint="/api/v1/healing/evaluate/response",
                    request_body=None,
                    response=response_data,
                    processing_ms=(time.time() - start_time) * 1000,
                )
            )
        return response_data

    except HTTPException:
        if span:
            span.set_status(Status(StatusCode.ERROR, "HTTP exception"))
            span.end()
        raise
    except Exception as e:
        error_msg = str(e)
        logger.exception("Error in evaluate_healing_decision_endpoint")
        if span:
            span.set_status(Status(StatusCode.ERROR, error_msg))
            span.record_exception(e)
            span.end()
        raise HTTPException(status_code=500, detail=error_msg)