from __future__ import annotations

from datetime import datetime
from typing import Any, List, Optional

from fastapi import APIRouter, HTTPException, Query

from app.schemas.metrics import (
    MetricCreate,
    MetricResultsWriteRequest,
    MetricRunTrigger,
    MetricScheduleCreate,
    MetricScheduleUpdate,
    MetricUpdate,
)
from app.services import metric_store


router = APIRouter(prefix="/api/v1", tags=["metrics"])


@router.post("/metrics")
def create_metric(payload: MetricCreate) -> Any:
    """Create a metric definition."""
    try:
        return metric_store.create_metric(payload)
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.post("/metrics/{metric_id}")
def update_metric(metric_id: int, payload: MetricUpdate) -> Any:
    """Update fields of a metric definition."""
    try:
        return metric_store.update_metric(metric_id, payload)
    except KeyError:
        raise HTTPException(status_code=404, detail="Metric not found")
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/metrics/{metric_id}")
def get_metric(metric_id: int) -> Any:
    """Fetch a metric definition by id."""
    metric = metric_store.get_metric(metric_id)
    if not metric:
        raise HTTPException(status_code=404, detail="Metric not found")
    return metric


@router.get("/metrics")
def list_metrics(
    biz_domain: Optional[str] = None,
    is_active: Optional[bool] = None,
    keyword: Optional[str] = Query(None, description="Search by code/name"),
    limit: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
) -> List[Any]:
    """List metrics with optional filters."""
    return metric_store.list_metrics(
        biz_domain=biz_domain,
        is_active=is_active,
        keyword=keyword,
        limit=limit,
        offset=offset,
    )


@router.post("/metric-schedules")
def create_schedule(payload: MetricScheduleCreate) -> Any:
    """Create a metric schedule."""
    try:
        return metric_store.create_metric_schedule(payload)
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.post("/metric-schedules/{schedule_id}")
def update_schedule(schedule_id: int, payload: MetricScheduleUpdate) -> Any:
    """Update a metric schedule."""
    try:
        return metric_store.update_metric_schedule(schedule_id, payload)
    except KeyError:
        raise HTTPException(status_code=404, detail="Schedule not found")
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/metrics/{metric_id}/schedules")
def list_schedules(metric_id: int) -> List[Any]:
    """List schedules for one metric."""
    return metric_store.list_schedules_for_metric(metric_id=metric_id)


@router.post("/metric-runs/trigger")
def trigger_run(payload: MetricRunTrigger) -> Any:
    """Insert a run record (execution handled externally)."""
    try:
        return metric_store.trigger_metric_run(payload)
    except KeyError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/metric-runs")
def list_runs(
    metric_id: Optional[int] = None,
    status: Optional[str] = None,
    limit: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
) -> List[Any]:
    """List run records."""
    return metric_store.list_metric_runs(
        metric_id=metric_id, status=status, limit=limit, offset=offset
    )


@router.get("/metric-runs/{run_id}")
def get_run(run_id: int) -> Any:
    """Fetch run details."""
    run = metric_store.get_metric_run(run_id)
    if not run:
        raise HTTPException(status_code=404, detail="Run not found")
    return run


@router.post("/metric-results/{metric_id}")
def write_results(metric_id: int, payload: MetricResultsWriteRequest) -> Any:
    # Align path metric_id with payload to avoid mismatch.
    if payload.metric_id != metric_id:
        raise HTTPException(status_code=400, detail="metric_id in path/body mismatch")
    try:
        inserted = metric_store.write_metric_results(payload)
    except KeyError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return {"metric_id": metric_id, "inserted": inserted}


@router.get("/metric-results")
def query_results(
    metric_id: int,
    stat_from: Optional[datetime] = None,
    stat_to: Optional[datetime] = None,
    limit: int = Query(200, ge=1, le=1000),
    offset: int = Query(0, ge=0),
) -> List[Any]:
    """Query metric results by time range."""
    return metric_store.query_metric_results(
        metric_id=metric_id,
        stat_from=stat_from,
        stat_to=stat_to,
        limit=limit,
        offset=offset,
    )


@router.get("/metric-results/latest")
def latest_result(metric_id: int) -> Any:
    """Fetch the latest metric result."""
    result = metric_store.latest_metric_result(metric_id)
    if not result:
        raise HTTPException(status_code=404, detail="Metric result not found")
    return result