"""Suppliers router.

GET  /api/suppliers
POST /api/suppliers
GET  /api/suppliers/{id}/performance
"""
from typing import List, Optional

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from app.database import get_db
from app.routers.auth import require_admin
from app.models import Supplier, SupplierPerformance
from app.schemas import SupplierCreate, SupplierOut, SupplierPerformanceOut

router = APIRouter(dependencies=[Depends(require_admin)])


@router.get("", response_model=List[SupplierOut])
def list_suppliers(status: Optional[str] = None, db: Session = Depends(get_db)):
    q = db.query(Supplier)
    if status:
        q = q.filter(Supplier.status == status)
    return q.order_by(Supplier.created_at.desc()).all()


@router.post("", response_model=SupplierOut)
def create_supplier(body: SupplierCreate, db: Session = Depends(get_db)):
    supplier = Supplier(
        name=body.name,
        adapter_type=body.adapter_type,
        api_endpoint=body.api_endpoint,
        account_id=body.account_id,
        fulfillment_caps=body.fulfillment_caps or {},
        shipping_regions=body.shipping_regions or [],
        reliability_score=body.reliability_score,
        status=body.status,
    )
    db.add(supplier)
    db.commit()
    db.refresh(supplier)
    return supplier


@router.get("/{supplier_id}/performance", response_model=SupplierPerformanceOut)
def supplier_performance(supplier_id, db: Session = Depends(get_db)):
    supplier = db.query(Supplier).filter(Supplier.id == supplier_id).first()
    if supplier is None:
        raise HTTPException(status_code=404, detail="supplier not found")

    perf = (
        db.query(SupplierPerformance)
        .filter(SupplierPerformance.supplier_id == supplier_id)
        .first()
    )
    if perf is None:
        # synthesize defaults; nothing measured yet
        return SupplierPerformanceOut(
            supplier_id=supplier_id,
            supplier_name=supplier.name,
            fulfillment_rate=100.0,
            avg_shipping_days=None,
            cancellation_rate=0.0,
            stock_accuracy=100.0,
            return_rate=0.0,
        )
    return SupplierPerformanceOut(
        supplier_id=supplier_id,
        supplier_name=supplier.name,
        fulfillment_rate=float(perf.fulfillment_rate or 0),
        avg_shipping_days=float(perf.avg_shipping_days) if perf.avg_shipping_days is not None else None,
        cancellation_rate=float(perf.cancellation_rate or 0),
        stock_accuracy=float(perf.stock_accuracy or 0),
        return_rate=float(perf.return_rate or 0),
        updated_at=perf.updated_at,
    )