# app/api/v1/vendor/letzshop.py
"""
Vendor API endpoints for Letzshop marketplace integration.

Provides vendor-level management of:
- Letzshop credentials
- Connection testing
- Order import and sync
- Fulfillment operations (confirm, reject, tracking)

Vendor Context: Uses token_vendor_id from JWT token.
"""

import logging

from fastapi import APIRouter, Depends, Path, Query
from sqlalchemy.orm import Session

from app.api.deps import get_current_vendor_api
from app.core.database import get_db
from app.exceptions import ResourceNotFoundException, ValidationException
from app.services.letzshop import (
    CredentialsNotFoundError,
    LetzshopClientError,
    LetzshopCredentialsService,
    LetzshopOrderService,
    OrderNotFoundError,
)
from models.database.user import User
from models.schema.letzshop import (
    FulfillmentConfirmRequest,
    FulfillmentOperationResponse,
    FulfillmentQueueItemResponse,
    FulfillmentQueueListResponse,
    FulfillmentRejectRequest,
    FulfillmentTrackingRequest,
    LetzshopConnectionTestRequest,
    LetzshopConnectionTestResponse,
    LetzshopCredentialsCreate,
    LetzshopCredentialsResponse,
    LetzshopCredentialsStatus,
    LetzshopCredentialsUpdate,
    LetzshopOrderDetailResponse,
    LetzshopOrderListResponse,
    LetzshopOrderResponse,
    LetzshopSuccessResponse,
    LetzshopSyncLogListResponse,
    LetzshopSyncLogResponse,
    LetzshopSyncTriggerRequest,
    LetzshopSyncTriggerResponse,
)

router = APIRouter(prefix="/letzshop")
logger = logging.getLogger(__name__)


# ============================================================================
# Helper Functions
# ============================================================================


def get_order_service(db: Session) -> LetzshopOrderService:
    """Get order service instance."""
    return LetzshopOrderService(db)


def get_credentials_service(db: Session) -> LetzshopCredentialsService:
    """Get credentials service instance."""
    return LetzshopCredentialsService(db)


# ============================================================================
# Status & Configuration
# ============================================================================


@router.get("/status", response_model=LetzshopCredentialsStatus)
def get_letzshop_status(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Get Letzshop integration status for the current vendor."""
    creds_service = get_credentials_service(db)
    status = creds_service.get_status(current_user.token_vendor_id)
    return LetzshopCredentialsStatus(**status)


@router.get("/credentials", response_model=LetzshopCredentialsResponse)
def get_credentials(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Get Letzshop credentials for the current vendor (API key is masked)."""
    creds_service = get_credentials_service(db)
    vendor_id = current_user.token_vendor_id

    try:
        credentials = creds_service.get_credentials_or_raise(vendor_id)
    except CredentialsNotFoundError:
        raise ResourceNotFoundException("LetzshopCredentials", str(vendor_id))

    return LetzshopCredentialsResponse(
        id=credentials.id,
        vendor_id=credentials.vendor_id,
        api_key_masked=creds_service.get_masked_api_key(vendor_id),
        api_endpoint=credentials.api_endpoint,
        auto_sync_enabled=credentials.auto_sync_enabled,
        sync_interval_minutes=credentials.sync_interval_minutes,
        last_sync_at=credentials.last_sync_at,
        last_sync_status=credentials.last_sync_status,
        last_sync_error=credentials.last_sync_error,
        created_at=credentials.created_at,
        updated_at=credentials.updated_at,
    )


@router.post("/credentials", response_model=LetzshopCredentialsResponse)
def save_credentials(
    credentials_data: LetzshopCredentialsCreate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Create or update Letzshop credentials for the current vendor."""
    creds_service = get_credentials_service(db)
    vendor_id = current_user.token_vendor_id

    credentials = creds_service.upsert_credentials(
        vendor_id=vendor_id,
        api_key=credentials_data.api_key,
        api_endpoint=credentials_data.api_endpoint,
        auto_sync_enabled=credentials_data.auto_sync_enabled,
        sync_interval_minutes=credentials_data.sync_interval_minutes,
    )
    db.commit()

    logger.info(f"Vendor user {current_user.email} updated Letzshop credentials")

    return LetzshopCredentialsResponse(
        id=credentials.id,
        vendor_id=credentials.vendor_id,
        api_key_masked=creds_service.get_masked_api_key(vendor_id),
        api_endpoint=credentials.api_endpoint,
        auto_sync_enabled=credentials.auto_sync_enabled,
        sync_interval_minutes=credentials.sync_interval_minutes,
        last_sync_at=credentials.last_sync_at,
        last_sync_status=credentials.last_sync_status,
        last_sync_error=credentials.last_sync_error,
        created_at=credentials.created_at,
        updated_at=credentials.updated_at,
    )


@router.patch("/credentials", response_model=LetzshopCredentialsResponse)
def update_credentials(
    credentials_data: LetzshopCredentialsUpdate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Partially update Letzshop credentials for the current vendor."""
    creds_service = get_credentials_service(db)
    vendor_id = current_user.token_vendor_id

    try:
        credentials = creds_service.update_credentials(
            vendor_id=vendor_id,
            api_key=credentials_data.api_key,
            api_endpoint=credentials_data.api_endpoint,
            auto_sync_enabled=credentials_data.auto_sync_enabled,
            sync_interval_minutes=credentials_data.sync_interval_minutes,
        )
        db.commit()
    except CredentialsNotFoundError:
        raise ResourceNotFoundException("LetzshopCredentials", str(vendor_id))

    return LetzshopCredentialsResponse(
        id=credentials.id,
        vendor_id=credentials.vendor_id,
        api_key_masked=creds_service.get_masked_api_key(vendor_id),
        api_endpoint=credentials.api_endpoint,
        auto_sync_enabled=credentials.auto_sync_enabled,
        sync_interval_minutes=credentials.sync_interval_minutes,
        last_sync_at=credentials.last_sync_at,
        last_sync_status=credentials.last_sync_status,
        last_sync_error=credentials.last_sync_error,
        created_at=credentials.created_at,
        updated_at=credentials.updated_at,
    )


@router.delete("/credentials", response_model=LetzshopSuccessResponse)
def delete_credentials(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Delete Letzshop credentials for the current vendor."""
    creds_service = get_credentials_service(db)

    deleted = creds_service.delete_credentials(current_user.token_vendor_id)
    if not deleted:
        raise ResourceNotFoundException(
            "LetzshopCredentials", str(current_user.token_vendor_id)
        )
    db.commit()

    logger.info(f"Vendor user {current_user.email} deleted Letzshop credentials")
    return LetzshopSuccessResponse(success=True, message="Letzshop credentials deleted")


# ============================================================================
# Connection Testing
# ============================================================================


@router.post("/test", response_model=LetzshopConnectionTestResponse)
def test_connection(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Test the Letzshop connection using stored credentials."""
    creds_service = get_credentials_service(db)

    success, response_time_ms, error = creds_service.test_connection(
        current_user.token_vendor_id
    )

    return LetzshopConnectionTestResponse(
        success=success,
        message="Connection successful" if success else "Connection failed",
        response_time_ms=response_time_ms,
        error_details=error,
    )


@router.post("/test-key", response_model=LetzshopConnectionTestResponse)
def test_api_key(
    test_request: LetzshopConnectionTestRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Test a Letzshop API key without saving it."""
    creds_service = get_credentials_service(db)

    success, response_time_ms, error = creds_service.test_api_key(
        api_key=test_request.api_key,
        api_endpoint=test_request.api_endpoint,
    )

    return LetzshopConnectionTestResponse(
        success=success,
        message="Connection successful" if success else "Connection failed",
        response_time_ms=response_time_ms,
        error_details=error,
    )


# ============================================================================
# Order Management
# ============================================================================


@router.get("/orders", response_model=LetzshopOrderListResponse)
def list_orders(
    skip: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    sync_status: str | None = Query(None, description="Filter by sync status"),
    letzshop_state: str | None = Query(None, description="Filter by Letzshop state"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """List Letzshop orders for the current vendor."""
    order_service = get_order_service(db)
    vendor_id = current_user.token_vendor_id

    orders, total = order_service.list_orders(
        vendor_id=vendor_id,
        skip=skip,
        limit=limit,
        sync_status=sync_status,
        letzshop_state=letzshop_state,
    )

    return LetzshopOrderListResponse(
        orders=[
            LetzshopOrderResponse(
                id=order.id,
                vendor_id=order.vendor_id,
                letzshop_order_id=order.letzshop_order_id,
                letzshop_shipment_id=order.letzshop_shipment_id,
                letzshop_order_number=order.letzshop_order_number,
                letzshop_state=order.letzshop_state,
                customer_email=order.customer_email,
                customer_name=order.customer_name,
                total_amount=order.total_amount,
                currency=order.currency,
                local_order_id=order.local_order_id,
                sync_status=order.sync_status,
                last_synced_at=order.last_synced_at,
                sync_error=order.sync_error,
                confirmed_at=order.confirmed_at,
                rejected_at=order.rejected_at,
                tracking_set_at=order.tracking_set_at,
                tracking_number=order.tracking_number,
                tracking_carrier=order.tracking_carrier,
                inventory_units=order.inventory_units,
                created_at=order.created_at,
                updated_at=order.updated_at,
            )
            for order in orders
        ],
        total=total,
        skip=skip,
        limit=limit,
    )


@router.get("/orders/{order_id}", response_model=LetzshopOrderDetailResponse)
def get_order(
    order_id: int = Path(..., description="Order ID"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Get a specific Letzshop order with full details."""
    order_service = get_order_service(db)

    try:
        order = order_service.get_order_or_raise(current_user.token_vendor_id, order_id)
    except OrderNotFoundError:
        raise ResourceNotFoundException("LetzshopOrder", str(order_id))

    return LetzshopOrderDetailResponse(
        id=order.id,
        vendor_id=order.vendor_id,
        letzshop_order_id=order.letzshop_order_id,
        letzshop_shipment_id=order.letzshop_shipment_id,
        letzshop_order_number=order.letzshop_order_number,
        letzshop_state=order.letzshop_state,
        customer_email=order.customer_email,
        customer_name=order.customer_name,
        total_amount=order.total_amount,
        currency=order.currency,
        local_order_id=order.local_order_id,
        sync_status=order.sync_status,
        last_synced_at=order.last_synced_at,
        sync_error=order.sync_error,
        confirmed_at=order.confirmed_at,
        rejected_at=order.rejected_at,
        tracking_set_at=order.tracking_set_at,
        tracking_number=order.tracking_number,
        tracking_carrier=order.tracking_carrier,
        inventory_units=order.inventory_units,
        raw_order_data=order.raw_order_data,
        created_at=order.created_at,
        updated_at=order.updated_at,
    )


@router.post("/orders/import", response_model=LetzshopSyncTriggerResponse)
def import_orders(
    sync_request: LetzshopSyncTriggerRequest = LetzshopSyncTriggerRequest(),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Import new orders from Letzshop."""
    vendor_id = current_user.token_vendor_id
    order_service = get_order_service(db)
    creds_service = get_credentials_service(db)

    # Verify credentials exist
    try:
        creds_service.get_credentials_or_raise(vendor_id)
    except CredentialsNotFoundError:
        raise ValidationException("Letzshop credentials not configured")

    # Import orders
    try:
        with creds_service.create_client(vendor_id) as client:
            shipments = client.get_unconfirmed_shipments()

            orders_imported = 0
            orders_updated = 0
            errors = []

            for shipment in shipments:
                try:
                    existing = order_service.get_order_by_shipment_id(
                        vendor_id, shipment["id"]
                    )

                    if existing:
                        order_service.update_order_from_shipment(existing, shipment)
                        orders_updated += 1
                    else:
                        order_service.create_order(vendor_id, shipment)
                        orders_imported += 1

                except Exception as e:
                    errors.append(
                        f"Error processing shipment {shipment.get('id')}: {e}"
                    )

            db.commit()
            creds_service.update_sync_status(
                vendor_id,
                "success" if not errors else "partial",
                "; ".join(errors) if errors else None,
            )

            return LetzshopSyncTriggerResponse(
                success=True,
                message=f"Import completed: {orders_imported} imported, {orders_updated} updated",
                orders_imported=orders_imported,
                orders_updated=orders_updated,
                errors=errors,
            )

    except LetzshopClientError as e:
        creds_service.update_sync_status(vendor_id, "failed", str(e))
        return LetzshopSyncTriggerResponse(
            success=False,
            message=f"Import failed: {e}",
            errors=[str(e)],
        )


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


@router.post("/orders/{order_id}/confirm", response_model=FulfillmentOperationResponse)
def confirm_order(
    order_id: int = Path(..., description="Order ID"),
    confirm_request: FulfillmentConfirmRequest | None = None,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Confirm inventory units for a Letzshop order."""
    vendor_id = current_user.token_vendor_id
    order_service = get_order_service(db)
    creds_service = get_credentials_service(db)

    try:
        order = order_service.get_order_or_raise(vendor_id, order_id)
    except OrderNotFoundError:
        raise ResourceNotFoundException("LetzshopOrder", str(order_id))

    # Get inventory unit IDs from request or order
    if confirm_request and confirm_request.inventory_unit_ids:
        inventory_unit_ids = confirm_request.inventory_unit_ids
    elif order.inventory_units:
        inventory_unit_ids = [u["id"] for u in order.inventory_units]
    else:
        raise ValidationException("No inventory units to confirm")

    try:
        with creds_service.create_client(vendor_id) as client:
            result = client.confirm_inventory_units(inventory_unit_ids)

            # Check for errors
            if result.get("errors"):
                error_messages = [
                    f"{e.get('id', 'unknown')}: {e.get('message', 'Unknown error')}"
                    for e in result["errors"]
                ]
                return FulfillmentOperationResponse(
                    success=False,
                    message="Some inventory units could not be confirmed",
                    errors=error_messages,
                )

            # Update order status
            order_service.mark_order_confirmed(order)
            db.commit()

            return FulfillmentOperationResponse(
                success=True,
                message=f"Confirmed {len(inventory_unit_ids)} inventory units",
                confirmed_units=[u.get("id") for u in result.get("inventoryUnits", [])],
            )

    except LetzshopClientError as e:
        return FulfillmentOperationResponse(success=False, message=str(e))


@router.post("/orders/{order_id}/reject", response_model=FulfillmentOperationResponse)
def reject_order(
    order_id: int = Path(..., description="Order ID"),
    reject_request: FulfillmentRejectRequest | None = None,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Reject inventory units for a Letzshop order."""
    vendor_id = current_user.token_vendor_id
    order_service = get_order_service(db)
    creds_service = get_credentials_service(db)

    try:
        order = order_service.get_order_or_raise(vendor_id, order_id)
    except OrderNotFoundError:
        raise ResourceNotFoundException("LetzshopOrder", str(order_id))

    # Get inventory unit IDs from request or order
    if reject_request and reject_request.inventory_unit_ids:
        inventory_unit_ids = reject_request.inventory_unit_ids
    elif order.inventory_units:
        inventory_unit_ids = [u["id"] for u in order.inventory_units]
    else:
        raise ValidationException("No inventory units to reject")

    try:
        with creds_service.create_client(vendor_id) as client:
            result = client.reject_inventory_units(inventory_unit_ids)

            if result.get("errors"):
                error_messages = [
                    f"{e.get('id', 'unknown')}: {e.get('message', 'Unknown error')}"
                    for e in result["errors"]
                ]
                return FulfillmentOperationResponse(
                    success=False,
                    message="Some inventory units could not be rejected",
                    errors=error_messages,
                )

            order_service.mark_order_rejected(order)
            db.commit()

            return FulfillmentOperationResponse(
                success=True,
                message=f"Rejected {len(inventory_unit_ids)} inventory units",
            )

    except LetzshopClientError as e:
        return FulfillmentOperationResponse(success=False, message=str(e))


@router.post("/orders/{order_id}/tracking", response_model=FulfillmentOperationResponse)
def set_order_tracking(
    order_id: int = Path(..., description="Order ID"),
    tracking_request: FulfillmentTrackingRequest = ...,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Set tracking information for a Letzshop order."""
    vendor_id = current_user.token_vendor_id
    order_service = get_order_service(db)
    creds_service = get_credentials_service(db)

    try:
        order = order_service.get_order_or_raise(vendor_id, order_id)
    except OrderNotFoundError:
        raise ResourceNotFoundException("LetzshopOrder", str(order_id))

    if not order.letzshop_shipment_id:
        raise ValidationException("Order does not have a shipment ID")

    try:
        with creds_service.create_client(vendor_id) as client:
            result = client.set_shipment_tracking(
                shipment_id=order.letzshop_shipment_id,
                tracking_code=tracking_request.tracking_number,
                tracking_provider=tracking_request.tracking_carrier,
            )

            if result.get("errors"):
                error_messages = [
                    f"{e.get('code', 'unknown')}: {e.get('message', 'Unknown error')}"
                    for e in result["errors"]
                ]
                return FulfillmentOperationResponse(
                    success=False,
                    message="Failed to set tracking",
                    errors=error_messages,
                )

            order_service.set_order_tracking(
                order,
                tracking_request.tracking_number,
                tracking_request.tracking_carrier,
            )
            db.commit()

            return FulfillmentOperationResponse(
                success=True,
                message="Tracking information set",
                tracking_number=tracking_request.tracking_number,
                tracking_carrier=tracking_request.tracking_carrier,
            )

    except LetzshopClientError as e:
        return FulfillmentOperationResponse(success=False, message=str(e))


# ============================================================================
# Sync Logs
# ============================================================================


@router.get("/logs", response_model=LetzshopSyncLogListResponse)
def list_sync_logs(
    skip: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """List Letzshop sync logs for the current vendor."""
    order_service = get_order_service(db)
    vendor_id = current_user.token_vendor_id

    logs, total = order_service.list_sync_logs(
        vendor_id=vendor_id,
        skip=skip,
        limit=limit,
    )

    return LetzshopSyncLogListResponse(
        logs=[
            LetzshopSyncLogResponse(
                id=log.id,
                vendor_id=log.vendor_id,
                operation_type=log.operation_type,
                direction=log.direction,
                status=log.status,
                records_processed=log.records_processed,
                records_succeeded=log.records_succeeded,
                records_failed=log.records_failed,
                error_details=log.error_details,
                started_at=log.started_at,
                completed_at=log.completed_at,
                duration_seconds=log.duration_seconds,
                triggered_by=log.triggered_by,
                created_at=log.created_at,
            )
            for log in logs
        ],
        total=total,
        skip=skip,
        limit=limit,
    )


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


@router.get("/queue", response_model=FulfillmentQueueListResponse)
def list_fulfillment_queue(
    skip: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    status: str | None = Query(None, description="Filter by status"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """List fulfillment queue items for the current vendor."""
    order_service = get_order_service(db)
    vendor_id = current_user.token_vendor_id

    items, total = order_service.list_fulfillment_queue(
        vendor_id=vendor_id,
        skip=skip,
        limit=limit,
        status=status,
    )

    return FulfillmentQueueListResponse(
        items=[
            FulfillmentQueueItemResponse(
                id=item.id,
                vendor_id=item.vendor_id,
                letzshop_order_id=item.letzshop_order_id,
                operation=item.operation,
                payload=item.payload,
                status=item.status,
                attempts=item.attempts,
                max_attempts=item.max_attempts,
                last_attempt_at=item.last_attempt_at,
                next_retry_at=item.next_retry_at,
                error_message=item.error_message,
                completed_at=item.completed_at,
                response_data=item.response_data,
                created_at=item.created_at,
                updated_at=item.updated_at,
            )
            for item in items
        ],
        total=total,
        skip=skip,
        limit=limit,
    )


# ============================================================================
# Product Export
# ============================================================================


@router.get("/export")
def export_products_letzshop(
    language: str = Query(
        "en", description="Language for title/description (en, fr, de)"
    ),
    include_inactive: bool = Query(False, description="Include inactive products"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Export vendor products in Letzshop CSV format.

    Generates a Google Shopping compatible CSV file for Letzshop marketplace.
    The file uses tab-separated values and includes all required Letzshop fields.

    **Supported languages:** en, fr, de

    **CSV Format:**
    - Delimiter: Tab (\\t)
    - Encoding: UTF-8
    - Fields: id, title, description, price, availability, image_link, etc.

    Returns:
        CSV file as attachment (vendor_code_letzshop_export.csv)
    """
    from fastapi.responses import Response

    from app.services.letzshop_export_service import letzshop_export_service
    from app.services.vendor_service import vendor_service

    vendor_id = current_user.token_vendor_id
    vendor = vendor_service.get_vendor_by_id(db, vendor_id)

    csv_content = letzshop_export_service.export_vendor_products(
        db=db,
        vendor_id=vendor_id,
        language=language,
        include_inactive=include_inactive,
    )

    filename = f"{vendor.vendor_code.lower()}_letzshop_export.csv"

    return Response(
        content=csv_content,
        media_type="text/csv; charset=utf-8",
        headers={
            "Content-Disposition": f'attachment; filename="{filename}"',
        },
    )