# shared/clients/inventory_client.py
"""
Inventory Service Client - Inter-service communication
Handles communication with the inventory service for all other services
"""

import structlog
from typing import Dict, Any, List, Optional, Union
from uuid import UUID

from shared.clients.base_service_client import BaseServiceClient
from shared.config.base import BaseServiceSettings

logger = structlog.get_logger()


class InventoryServiceClient(BaseServiceClient):
    """Client for communicating with the inventory service via gateway"""
    
    def __init__(self, config: BaseServiceSettings, calling_service_name: str = "unknown"):
        super().__init__(calling_service_name, config)
    
    def get_service_base_path(self) -> str:
        """Return the base path for inventory service APIs"""
        return "/api/v1"
    
    # ================================================================
    # INGREDIENT MANAGEMENT
    # ================================================================
    
    async def get_ingredient_by_id(self, ingredient_id: UUID, tenant_id: str) -> Optional[Dict[str, Any]]:
        """Get ingredient details by ID"""
        try:
            result = await self.get(f"inventory/ingredients/{ingredient_id}", tenant_id=tenant_id)
            if result:
                logger.info("Retrieved ingredient from inventory service",
                          ingredient_id=ingredient_id, tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error fetching ingredient by ID",
                       error=str(e), ingredient_id=ingredient_id, tenant_id=tenant_id)
            return None
    
    async def search_ingredients(
        self, 
        tenant_id: str,
        search: Optional[str] = None,
        category: Optional[str] = None,
        is_active: Optional[bool] = None,
        skip: int = 0,
        limit: int = 100
    ) -> List[Dict[str, Any]]:
        """Search ingredients with filters"""
        try:
            params = {
                "skip": skip,
                "limit": limit
            }
            
            if search:
                params["search"] = search
            if category:
                params["category"] = category
            if is_active is not None:
                params["is_active"] = is_active
            
            result = await self.get("inventory/ingredients", tenant_id=tenant_id, params=params)
            ingredients = result if isinstance(result, list) else []

            logger.info("Searched ingredients in inventory service",
                      search_term=search, count=len(ingredients), tenant_id=tenant_id)
            return ingredients
            
        except Exception as e:
            logger.error("Error searching ingredients", 
                       error=str(e), search=search, tenant_id=tenant_id)
            return []
    
    async def get_all_ingredients(self, tenant_id: str, is_active: Optional[bool] = True) -> List[Dict[str, Any]]:
        """Get all ingredients for a tenant (paginated)"""
        try:
            params = {}
            if is_active is not None:
                params["is_active"] = is_active

            ingredients = await self.get_paginated("inventory/ingredients", tenant_id=tenant_id, params=params)

            logger.info("Retrieved all ingredients from inventory service",
                      count=len(ingredients), tenant_id=tenant_id)
            return ingredients

        except Exception as e:
            logger.error("Error fetching all ingredients",
                       error=str(e), tenant_id=tenant_id)
            return []

    async def count_ingredients(self, tenant_id: str, is_active: Optional[bool] = True) -> int:
        """Get count of ingredients for a tenant"""
        try:
            params = {}
            if is_active is not None:
                params["is_active"] = is_active

            result = await self.get("inventory/ingredients/count", tenant_id=tenant_id, params=params)
            count = result.get("ingredient_count", 0) if isinstance(result, dict) else 0

            logger.info("Retrieved ingredient count from inventory service",
                      count=count, tenant_id=tenant_id)
            return count

        except Exception as e:
            logger.error("Error fetching ingredient count",
                       error=str(e), tenant_id=tenant_id)
            return 0
    
    async def create_ingredient(self, ingredient_data: Dict[str, Any], tenant_id: str) -> Optional[Dict[str, Any]]:
        """Create a new ingredient"""
        try:
            result = await self.post("inventory/ingredients", data=ingredient_data, tenant_id=tenant_id)
            if result:
                logger.info("Created ingredient in inventory service", 
                          ingredient_name=ingredient_data.get('name'), tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error creating ingredient", 
                       error=str(e), ingredient_data=ingredient_data, tenant_id=tenant_id)
            return None
    
    async def update_ingredient(
        self, 
        ingredient_id: UUID, 
        ingredient_data: Dict[str, Any], 
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Update an existing ingredient"""
        try:
            result = await self.put(f"inventory/ingredients/{ingredient_id}", data=ingredient_data, tenant_id=tenant_id)
            if result:
                logger.info("Updated ingredient in inventory service", 
                          ingredient_id=ingredient_id, tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error updating ingredient", 
                       error=str(e), ingredient_id=ingredient_id, tenant_id=tenant_id)
            return None
    
    async def delete_ingredient(self, ingredient_id: UUID, tenant_id: str) -> bool:
        """Delete (deactivate) an ingredient"""
        try:
            result = await self.delete(f"inventory/ingredients/{ingredient_id}", tenant_id=tenant_id)
            success = result is not None
            if success:
                logger.info("Deleted ingredient in inventory service", 
                          ingredient_id=ingredient_id, tenant_id=tenant_id)
            return success
        except Exception as e:
            logger.error("Error deleting ingredient", 
                       error=str(e), ingredient_id=ingredient_id, tenant_id=tenant_id)
            return False
    
    async def get_ingredient_stock(
        self, 
        ingredient_id: UUID, 
        tenant_id: str, 
        include_unavailable: bool = False
    ) -> List[Dict[str, Any]]:
        """Get stock entries for an ingredient"""
        try:
            params = {}
            if include_unavailable:
                params["include_unavailable"] = include_unavailable
            
            result = await self.get(f"inventory/ingredients/{ingredient_id}/stock", tenant_id=tenant_id, params=params)
            stock_entries = result if isinstance(result, list) else []
            
            logger.info("Retrieved ingredient stock from inventory service", 
                      ingredient_id=ingredient_id, stock_count=len(stock_entries), tenant_id=tenant_id)
            return stock_entries
            
        except Exception as e:
            logger.error("Error fetching ingredient stock", 
                       error=str(e), ingredient_id=ingredient_id, tenant_id=tenant_id)
            return []
    
    # ================================================================
    # STOCK MANAGEMENT
    # ================================================================
    
    async def get_stock_levels(self, tenant_id: str, ingredient_ids: Optional[List[UUID]] = None) -> List[Dict[str, Any]]:
        """Get current stock levels"""
        try:
            params = {}
            if ingredient_ids:
                params["ingredient_ids"] = [str(id) for id in ingredient_ids]
            
            result = await self.get("inventory/stock", tenant_id=tenant_id, params=params)
            stock_levels = result if isinstance(result, list) else []
            
            logger.info("Retrieved stock levels from inventory service", 
                      count=len(stock_levels), tenant_id=tenant_id)
            return stock_levels
            
        except Exception as e:
            logger.error("Error fetching stock levels", 
                       error=str(e), tenant_id=tenant_id)
            return []
    
    async def get_low_stock_alerts(self, tenant_id: str) -> List[Dict[str, Any]]:
        """Get low stock alerts"""
        try:
            result = await self.get("inventory/alerts", tenant_id=tenant_id, params={"type": "low_stock"})
            alerts = result if isinstance(result, list) else []
            
            logger.info("Retrieved low stock alerts from inventory service", 
                      count=len(alerts), tenant_id=tenant_id)
            return alerts
            
        except Exception as e:
            logger.error("Error fetching low stock alerts", 
                       error=str(e), tenant_id=tenant_id)
            return []
    
    async def consume_stock(
        self, 
        consumption_data: Dict[str, Any], 
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Record stock consumption"""
        try:
            result = await self.post("inventory/operations/consume-stock", data=consumption_data, tenant_id=tenant_id)
            if result:
                logger.info("Recorded stock consumption", 
                          tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error recording stock consumption", 
                       error=str(e), tenant_id=tenant_id)
            return None
    
    async def receive_stock(
        self, 
        receipt_data: Dict[str, Any], 
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Record stock receipt"""
        try:
            result = await self.post("inventory/operations/receive-stock", data=receipt_data, tenant_id=tenant_id)
            if result:
                logger.info("Recorded stock receipt", 
                          tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error recording stock receipt", 
                       error=str(e), tenant_id=tenant_id)
            return None
    
    # ================================================================
    # PRODUCT CLASSIFICATION (for onboarding)
    # ================================================================

    async def classify_product(
        self,
        product_name: str,
        sales_volume: Optional[float],
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Classify a single product for inventory creation"""
        try:
            classification_data = {
                "product_name": product_name,
                "sales_volume": sales_volume
            }

            result = await self.post("inventory/operations/classify-product", data=classification_data, tenant_id=tenant_id)
            if result:
                logger.info("Classified product",
                          product=product_name,
                          classification=result.get('product_type'),
                          confidence=result.get('confidence_score'),
                          tenant_id=tenant_id)
            return result

        except Exception as e:
            logger.error("Error classifying product",
                       error=str(e), product=product_name, tenant_id=tenant_id)
            return None

    async def classify_products_batch(
        self,
        products: List[Dict[str, Any]],
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Classify multiple products for onboarding automation"""
        try:
            classification_data = {
                "products": products
            }

            result = await self.post("inventory/operations/classify-products-batch", data=classification_data, tenant_id=tenant_id)
            if result:
                suggestions = result.get('suggestions', [])
                business_model = result.get('business_model_analysis', {}).get('model', 'unknown')

                logger.info("Batch classification complete",
                          total_products=len(suggestions),
                          business_model=business_model,
                          tenant_id=tenant_id)
            return result

        except Exception as e:
            logger.error("Error in batch classification",
                       error=str(e), products_count=len(products), tenant_id=tenant_id)
            return None

    async def resolve_or_create_products_batch(
        self,
        products: List[Dict[str, Any]],
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Resolve or create multiple products in a single batch operation"""
        try:
            batch_data = {
                "products": products
            }

            result = await self.post("inventory/operations/resolve-or-create-products-batch",
                                   data=batch_data, tenant_id=tenant_id)
            if result:
                created = result.get('created_count', 0)
                resolved = result.get('resolved_count', 0)
                failed = result.get('failed_count', 0)

                logger.info("Batch product resolution complete",
                          created=created,
                          resolved=resolved,
                          failed=failed,
                          total=len(products),
                          tenant_id=tenant_id)
            return result

        except Exception as e:
            logger.error("Error in batch product resolution",
                       error=str(e), products_count=len(products), tenant_id=tenant_id)
            return None
    
    # ================================================================
    # DASHBOARD AND ANALYTICS
    # ================================================================
    
    async def get_inventory_dashboard(self, tenant_id: str) -> Optional[Dict[str, Any]]:
        """Get inventory dashboard data"""
        try:
            result = await self.get("inventory/dashboard/overview", tenant_id=tenant_id)
            if result:
                logger.info("Retrieved inventory dashboard data", tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error fetching inventory dashboard", 
                       error=str(e), tenant_id=tenant_id)
            return None
    
    async def get_inventory_summary(self, tenant_id: str) -> Optional[Dict[str, Any]]:
        """Get inventory summary statistics"""
        try:
            result = await self.get("inventory/dashboard/summary", tenant_id=tenant_id)
            if result:
                logger.info("Retrieved inventory summary", tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error fetching inventory summary", 
                       error=str(e), tenant_id=tenant_id)
            return None
    
    # ================================================================
    # PRODUCT TRANSFORMATION
    # ================================================================

    async def create_transformation(
        self,
        transformation_data: Dict[str, Any],
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Create a product transformation (e.g., par-baked to fully baked)"""
        try:
            result = await self.post("inventory/transformations", data=transformation_data, tenant_id=tenant_id)
            if result:
                logger.info("Created product transformation",
                          transformation_reference=result.get('transformation_reference'),
                          source_stage=transformation_data.get('source_stage'),
                          target_stage=transformation_data.get('target_stage'),
                          tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error creating transformation",
                       error=str(e), transformation_data=transformation_data, tenant_id=tenant_id)
            return None

    async def create_par_bake_transformation(
        self,
        source_ingredient_id: Union[str, UUID],
        target_ingredient_id: Union[str, UUID],
        quantity: float,
        tenant_id: str,
        target_batch_number: Optional[str] = None,
        expiration_hours: int = 24,
        notes: Optional[str] = None
    ) -> Optional[Dict[str, Any]]:
        """Convenience method for par-baked to fresh transformation"""
        try:
            params = {
                "source_ingredient_id": str(source_ingredient_id),
                "target_ingredient_id": str(target_ingredient_id),
                "quantity": quantity,
                "expiration_hours": expiration_hours
            }

            if target_batch_number:
                params["target_batch_number"] = target_batch_number
            if notes:
                params["notes"] = notes

            result = await self.post("inventory/transformations/par-bake-to-fresh", params=params, tenant_id=tenant_id)
            if result:
                logger.info("Created par-bake transformation",
                          transformation_id=result.get('transformation_id'),
                          quantity=quantity, tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error creating par-bake transformation",
                       error=str(e), source_ingredient_id=source_ingredient_id,
                       target_ingredient_id=target_ingredient_id, tenant_id=tenant_id)
            return None

    async def get_transformations(
        self,
        tenant_id: str,
        ingredient_id: Optional[Union[str, UUID]] = None,
        source_stage: Optional[str] = None,
        target_stage: Optional[str] = None,
        days_back: Optional[int] = None,
        skip: int = 0,
        limit: int = 100
    ) -> List[Dict[str, Any]]:
        """Get product transformations with filtering"""
        try:
            params = {
                "skip": skip,
                "limit": limit
            }

            if ingredient_id:
                params["ingredient_id"] = str(ingredient_id)
            if source_stage:
                params["source_stage"] = source_stage
            if target_stage:
                params["target_stage"] = target_stage
            if days_back:
                params["days_back"] = days_back

            result = await self.get("inventory/transformations", tenant_id=tenant_id, params=params)
            transformations = result if isinstance(result, list) else []

            logger.info("Retrieved transformations from inventory service",
                      count=len(transformations), tenant_id=tenant_id)
            return transformations

        except Exception as e:
            logger.error("Error fetching transformations",
                       error=str(e), tenant_id=tenant_id)
            return []

    async def get_transformation_by_id(
        self,
        transformation_id: Union[str, UUID],
        tenant_id: str
    ) -> Optional[Dict[str, Any]]:
        """Get specific transformation by ID"""
        try:
            result = await self.get(f"inventory/transformations/{transformation_id}", tenant_id=tenant_id)
            if result:
                logger.info("Retrieved transformation by ID",
                          transformation_id=transformation_id, tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error fetching transformation by ID",
                       error=str(e), transformation_id=transformation_id, tenant_id=tenant_id)
            return None

    async def get_transformation_summary(
        self,
        tenant_id: str,
        days_back: int = 30
    ) -> Optional[Dict[str, Any]]:
        """Get transformation summary for dashboard"""
        try:
            params = {"days_back": days_back}
            result = await self.get("inventory/dashboard/transformations-summary", tenant_id=tenant_id, params=params)
            if result:
                logger.info("Retrieved transformation summary",
                          days_back=days_back, tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error fetching transformation summary",
                       error=str(e), tenant_id=tenant_id)
            return None

    # ================================================================
    # BATCH OPERATIONS (NEW - for Orchestrator optimization)
    # ================================================================

    async def get_ingredients_batch(
        self,
        tenant_id: str,
        ingredient_ids: List[UUID]
    ) -> Dict[str, Any]:
        """
        Fetch multiple ingredients in a single request.

        This method reduces N API calls to 1, significantly improving
        performance when fetching data for multiple ingredients.

        Args:
            tenant_id: Tenant ID
            ingredient_ids: List of ingredient IDs to fetch

        Returns:
            Dict with 'ingredients', 'found_count', and 'missing_ids'
        """
        try:
            if not ingredient_ids:
                return {
                    'ingredients': [],
                    'found_count': 0,
                    'missing_ids': []
                }

            # Convert UUIDs to strings for JSON serialization
            ids_str = [str(id) for id in ingredient_ids]

            result = await self.post(
                "inventory/operations/ingredients/batch",
                data={"ingredient_ids": ids_str},
                tenant_id=tenant_id
            )

            if result:
                logger.info(
                    "Retrieved ingredients in batch",
                    requested=len(ingredient_ids),
                    found=result.get('found_count', 0),
                    tenant_id=tenant_id
                )

            return result or {'ingredients': [], 'found_count': 0, 'missing_ids': ids_str}

        except Exception as e:
            logger.error(
                "Error fetching ingredients in batch",
                error=str(e),
                count=len(ingredient_ids),
                tenant_id=tenant_id
            )
            return {'ingredients': [], 'found_count': 0, 'missing_ids': [str(id) for id in ingredient_ids]}

    async def get_stock_levels_batch(
        self,
        tenant_id: str,
        ingredient_ids: List[UUID]
    ) -> Dict[str, float]:
        """
        Fetch stock levels for multiple ingredients in a single request.

        Args:
            tenant_id: Tenant ID
            ingredient_ids: List of ingredient IDs

        Returns:
            Dict mapping ingredient_id (str) to stock level (float)
        """
        try:
            if not ingredient_ids:
                return {}

            # Convert UUIDs to strings for JSON serialization
            ids_str = [str(id) for id in ingredient_ids]

            result = await self.post(
                "inventory/operations/stock-levels/batch",
                data={"ingredient_ids": ids_str},
                tenant_id=tenant_id
            )

            stock_levels = result.get('stock_levels', {}) if result else {}

            logger.info(
                "Retrieved stock levels in batch",
                requested=len(ingredient_ids),
                found=len(stock_levels),
                tenant_id=tenant_id
            )

            return stock_levels

        except Exception as e:
            logger.error(
                "Error fetching stock levels in batch",
                error=str(e),
                count=len(ingredient_ids),
                tenant_id=tenant_id
            )
            return {}

    # ================================================================
    # ML INSIGHTS: Safety Stock Optimization
    # ================================================================

    async def trigger_safety_stock_optimization(
        self,
        tenant_id: str,
        product_ids: Optional[List[str]] = None,
        lookback_days: int = 90,
        min_history_days: int = 30
    ) -> Optional[Dict[str, Any]]:
        """
        Trigger safety stock optimization for inventory products.

        Args:
            tenant_id: Tenant UUID
            product_ids: Specific product IDs to optimize. If None, optimizes all products
            lookback_days: Days of historical demand to analyze (30-365)
            min_history_days: Minimum days of history required (7-180)

        Returns:
            Dict with optimization results including insights posted
        """
        try:
            data = {
                "product_ids": product_ids,
                "lookback_days": lookback_days,
                "min_history_days": min_history_days
            }
            result = await self.post("inventory/ml/insights/optimize-safety-stock", data=data, tenant_id=tenant_id)
            if result:
                logger.info("Triggered safety stock optimization",
                          products_optimized=result.get('products_optimized', 0),
                          insights_posted=result.get('total_insights_posted', 0),
                          tenant_id=tenant_id)
            return result
        except Exception as e:
            logger.error("Error triggering safety stock optimization",
                       error=str(e), tenant_id=tenant_id)
            return None

    # ================================================================
    # UTILITY METHODS
    # ================================================================

    async def health_check(self) -> bool:
        """Check if inventory service is healthy"""
        try:
            result = await self.get("../health")  # Health endpoint is not tenant-scoped
            return result is not None
        except Exception as e:
            logger.error("Inventory service health check failed", error=str(e))
            return False


# Factory function for dependency injection
def create_inventory_client(config: BaseServiceSettings) -> InventoryServiceClient:
    """Create inventory service client instance"""
    return InventoryServiceClient(config)


# Convenience function for quick access (requires config to be passed)
async def get_inventory_client(config: BaseServiceSettings) -> InventoryServiceClient:
    """Get inventory service client instance"""
    return create_inventory_client(config)