# app/services/letzshop/order_service.py
"""
Letzshop order service for handling order-related database operations.

This service moves database queries out of the API layer to comply with
architecture rules (API-002: endpoints should not contain business logic).
"""

import logging
from datetime import UTC, datetime
from typing import Any

from sqlalchemy import func
from sqlalchemy.orm import Session

from models.database.letzshop import (
    LetzshopFulfillmentQueue,
    LetzshopOrder,
    LetzshopSyncLog,
    VendorLetzshopCredentials,
)
from models.database.vendor import Vendor

logger = logging.getLogger(__name__)


class VendorNotFoundError(Exception):
    """Raised when a vendor is not found."""


class OrderNotFoundError(Exception):
    """Raised when a Letzshop order is not found."""


class LetzshopOrderService:
    """Service for Letzshop order database operations."""

    def __init__(self, db: Session):
        self.db = db

    # =========================================================================
    # Vendor Operations
    # =========================================================================

    def get_vendor(self, vendor_id: int) -> Vendor | None:
        """Get vendor by ID."""
        return self.db.query(Vendor).filter(Vendor.id == vendor_id).first()

    def get_vendor_or_raise(self, vendor_id: int) -> Vendor:
        """Get vendor by ID or raise VendorNotFoundError."""
        vendor = self.get_vendor(vendor_id)
        if vendor is None:
            raise VendorNotFoundError(f"Vendor with ID {vendor_id} not found")
        return vendor

    def list_vendors_with_letzshop_status(
        self,
        skip: int = 0,
        limit: int = 100,
        configured_only: bool = False,
    ) -> tuple[list[dict[str, Any]], int]:
        """
        List vendors with their Letzshop integration status.

        Returns a tuple of (vendor_overviews, total_count).
        """
        # Build query
        query = self.db.query(Vendor).filter(Vendor.is_active == True)  # noqa: E712

        if configured_only:
            query = query.join(
                VendorLetzshopCredentials,
                Vendor.id == VendorLetzshopCredentials.vendor_id,
            )

        # Get total count
        total = query.count()

        # Get vendors
        vendors = query.order_by(Vendor.name).offset(skip).limit(limit).all()

        # Build response with Letzshop status
        vendor_overviews = []
        for vendor in vendors:
            # Get credentials
            credentials = (
                self.db.query(VendorLetzshopCredentials)
                .filter(VendorLetzshopCredentials.vendor_id == vendor.id)
                .first()
            )

            # Get order counts
            pending_orders = 0
            total_orders = 0
            if credentials:
                pending_orders = (
                    self.db.query(func.count(LetzshopOrder.id))
                    .filter(
                        LetzshopOrder.vendor_id == vendor.id,
                        LetzshopOrder.sync_status == "pending",
                    )
                    .scalar()
                    or 0
                )
                total_orders = (
                    self.db.query(func.count(LetzshopOrder.id))
                    .filter(LetzshopOrder.vendor_id == vendor.id)
                    .scalar()
                    or 0
                )

            vendor_overviews.append(
                {
                    "vendor_id": vendor.id,
                    "vendor_name": vendor.name,
                    "vendor_code": vendor.vendor_code,
                    "is_configured": credentials is not None,
                    "auto_sync_enabled": credentials.auto_sync_enabled
                    if credentials
                    else False,
                    "last_sync_at": credentials.last_sync_at if credentials else None,
                    "last_sync_status": credentials.last_sync_status
                    if credentials
                    else None,
                    "pending_orders": pending_orders,
                    "total_orders": total_orders,
                }
            )

        return vendor_overviews, total

    # =========================================================================
    # Order Operations
    # =========================================================================

    def get_order(self, vendor_id: int, order_id: int) -> LetzshopOrder | None:
        """Get a Letzshop order by ID for a specific vendor."""
        return (
            self.db.query(LetzshopOrder)
            .filter(
                LetzshopOrder.id == order_id,
                LetzshopOrder.vendor_id == vendor_id,
            )
            .first()
        )

    def get_order_or_raise(self, vendor_id: int, order_id: int) -> LetzshopOrder:
        """Get a Letzshop order or raise OrderNotFoundError."""
        order = self.get_order(vendor_id, order_id)
        if order is None:
            raise OrderNotFoundError(f"Letzshop order {order_id} not found")
        return order

    def get_order_by_shipment_id(
        self, vendor_id: int, shipment_id: str
    ) -> LetzshopOrder | None:
        """Get a Letzshop order by shipment ID."""
        return (
            self.db.query(LetzshopOrder)
            .filter(
                LetzshopOrder.vendor_id == vendor_id,
                LetzshopOrder.letzshop_shipment_id == shipment_id,
            )
            .first()
        )

    def list_orders(
        self,
        vendor_id: int,
        skip: int = 0,
        limit: int = 50,
        sync_status: str | None = None,
        letzshop_state: str | None = None,
    ) -> tuple[list[LetzshopOrder], int]:
        """
        List Letzshop orders for a vendor.

        Returns a tuple of (orders, total_count).
        """
        query = self.db.query(LetzshopOrder).filter(
            LetzshopOrder.vendor_id == vendor_id
        )

        if sync_status:
            query = query.filter(LetzshopOrder.sync_status == sync_status)
        if letzshop_state:
            query = query.filter(LetzshopOrder.letzshop_state == letzshop_state)

        total = query.count()
        orders = (
            query.order_by(LetzshopOrder.created_at.desc())
            .offset(skip)
            .limit(limit)
            .all()
        )

        return orders, total

    def create_order(
        self,
        vendor_id: int,
        shipment_data: dict[str, Any],
    ) -> LetzshopOrder:
        """Create a new Letzshop order from shipment data."""
        order_data = shipment_data.get("order", {})

        order = LetzshopOrder(
            vendor_id=vendor_id,
            letzshop_order_id=order_data.get("id", ""),
            letzshop_shipment_id=shipment_data["id"],
            letzshop_order_number=order_data.get("number"),
            letzshop_state=shipment_data.get("state"),
            customer_email=order_data.get("email"),
            total_amount=str(order_data.get("totalPrice", {}).get("amount", "")),
            currency=order_data.get("totalPrice", {}).get("currency", "EUR"),
            raw_order_data=shipment_data,
            inventory_units=[
                {"id": u["id"], "state": u["state"]}
                for u in shipment_data.get("inventoryUnits", {}).get("nodes", [])
            ],
            sync_status="pending",
        )
        self.db.add(order)
        return order

    def update_order_from_shipment(
        self,
        order: LetzshopOrder,
        shipment_data: dict[str, Any],
    ) -> LetzshopOrder:
        """Update an existing order from shipment data."""
        order.letzshop_state = shipment_data.get("state")
        order.raw_order_data = shipment_data
        return order

    def mark_order_confirmed(self, order: LetzshopOrder) -> LetzshopOrder:
        """Mark an order as confirmed."""
        order.confirmed_at = datetime.now(UTC)
        order.sync_status = "confirmed"
        return order

    def mark_order_rejected(self, order: LetzshopOrder) -> LetzshopOrder:
        """Mark an order as rejected."""
        order.rejected_at = datetime.now(UTC)
        order.sync_status = "rejected"
        return order

    def set_order_tracking(
        self,
        order: LetzshopOrder,
        tracking_number: str,
        tracking_carrier: str,
    ) -> LetzshopOrder:
        """Set tracking information for an order."""
        order.tracking_number = tracking_number
        order.tracking_carrier = tracking_carrier
        order.tracking_set_at = datetime.now(UTC)
        order.sync_status = "shipped"
        return order

    # =========================================================================
    # Sync Log Operations
    # =========================================================================

    def list_sync_logs(
        self,
        vendor_id: int,
        skip: int = 0,
        limit: int = 50,
    ) -> tuple[list[LetzshopSyncLog], int]:
        """
        List sync logs for a vendor.

        Returns a tuple of (logs, total_count).
        """
        query = self.db.query(LetzshopSyncLog).filter(
            LetzshopSyncLog.vendor_id == vendor_id
        )
        total = query.count()
        logs = (
            query.order_by(LetzshopSyncLog.started_at.desc())
            .offset(skip)
            .limit(limit)
            .all()
        )
        return logs, total

    # =========================================================================
    # Fulfillment Queue Operations
    # =========================================================================

    def list_fulfillment_queue(
        self,
        vendor_id: int,
        skip: int = 0,
        limit: int = 50,
        status: str | None = None,
    ) -> tuple[list[LetzshopFulfillmentQueue], int]:
        """
        List fulfillment queue items for a vendor.

        Returns a tuple of (items, total_count).
        """
        query = self.db.query(LetzshopFulfillmentQueue).filter(
            LetzshopFulfillmentQueue.vendor_id == vendor_id
        )

        if status:
            query = query.filter(LetzshopFulfillmentQueue.status == status)

        total = query.count()
        items = (
            query.order_by(LetzshopFulfillmentQueue.created_at.desc())
            .offset(skip)
            .limit(limit)
            .all()
        )
        return items, total