from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import List
import database
import models
import schemas
from datetime import datetime

router = APIRouter(tags=["metrics"])

def get_current_timestamp():
    return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%fZ')

# ============================================================
# METRIC TYPES
# ============================================================
@router.post("/metric-types/", response_model=schemas.MetricType)
def create_metric_type(metric_type: schemas.MetricTypeCreate, db: Session = Depends(database.get_db)):
    db_mt = db.query(models.MetricType).filter(models.MetricType.sync_id == metric_type.sync_id).first()
    if db_mt:
        raise HTTPException(status_code=400, detail="MetricType with this sync_id already exists")

    db_mt = models.MetricType(
        **metric_type.dict(),
        created_at=get_current_timestamp()
    )
    db.add(db_mt)
    db.commit()
    db.refresh(db_mt)
    return db_mt

@router.get("/metric-types/", response_model=List[schemas.MetricType])
def list_metric_types(db: Session = Depends(database.get_db)):
    return db.query(models.MetricType).order_by(models.MetricType.sort_order).all()

# ============================================================
# BODY METRICS
# ============================================================
@router.post("/body-metrics/", response_model=schemas.BodyMetric)
def create_body_metric(metric: schemas.BodyMetricCreate, db: Session = Depends(database.get_db)):
    db_metric = db.query(models.BodyMetric).filter(models.BodyMetric.sync_id == metric.sync_id).first()
    if db_metric:
        raise HTTPException(status_code=400, detail="BodyMetric with this sync_id already exists")

    db_metric = models.BodyMetric(
        sync_id=metric.sync_id,
        client_id=metric.client_id,
        metric_date=metric.metric_date,
        notes=metric.notes,
        created_at=get_current_timestamp()
    )
    db.add(db_metric)
    db.flush()

    # Добавляем значения
    for value_data in metric.values or []:
        db_value = models.BodyMetricValue(
            body_metric_id=db_metric.id,
            metric_type_id=value_data.metric_type_id,
            value=value_data.value
        )
        db.add(db_value)

    db.commit()
    db.refresh(db_metric)
    return db_metric

@router.get("/body-metrics/", response_model=List[schemas.BodyMetric])
def list_body_metrics(client_id: int = None, db: Session = Depends(database.get_db)):
    query = db.query(models.BodyMetric)
    if client_id:
        query = query.filter(models.BodyMetric.client_id == client_id)
    return query.order_by(models.BodyMetric.metric_date.desc()).all()

@router.get("/body-metrics/history")
def get_metric_history(
    client_id: int,
    metric_type_id: int,
    limit: int = 50,
    db: Session = Depends(database.get_db)
):
    """Получить историю конкретного замера для графиков"""
    results = db.query(
        models.BodyMetric.metric_date,
        models.BodyMetricValue.value
    ).join(
        models.BodyMetricValue, models.BodyMetricValue.body_metric_id == models.BodyMetric.id
    ).filter(
        models.BodyMetric.client_id == client_id,
        models.BodyMetricValue.metric_type_id == metric_type_id
    ).order_by(models.BodyMetric.metric_date.desc()).limit(limit).all()

    return [
        {
            "date": r.metric_date,
            "value": r.value
        }
        for r in results
    ]