# controllers/inventory.py

from flask import request, jsonify
from models.schemas.inventory_schema import create_inventory_item, update_inventory_item, get_inventory_item_by_id, \
    get_all_inventory_items
from controllers.data_logging import log_inventory_addition, log_inventory_update


# Add a new inventory item
def add_inventory_item():
    """
    Adds a new inventory item to the system.

    Expects:
    - user_id: The ID of the user adding the item.
    - item_name: Name of the inventory item.
    - category: Category of the item (e.g., "Feed", "Medicine").
    - quantity: Total quantity of the item.
    - unit: Unit of measurement (e.g., "kg", "liters").
    - description: Optional. Additional notes or description about the item.

    Returns:
    - JSON response with the result of the addition.
    """
    try:
        # Extract data from the request
        user_id = request.json.get('user_id')
        item_name = request.json.get('item_name')
        category = request.json.get('category')
        quantity = request.json.get('quantity')
        unit = request.json.get('unit')
        description = request.json.get('description')

        if not user_id or not item_name or not category or not quantity or not unit:
            return jsonify({"error": "Missing required fields"}), 400

        # Add the inventory item
        item_id = create_inventory_item(item_name, category, quantity, unit, user_id, description)

        # Log the inventory addition
        log_inventory_addition(user_id, item_name, category, quantity, unit, description)

        return jsonify({"message": "Inventory item added successfully", "item_id": item_id}), 201

    except Exception as e:
        return jsonify({"error": str(e)}), 500


# Update an existing inventory item
def update_inventory_item_by_id():
    """
    Updates an existing inventory item.

    Expects:
    - user_id: The ID of the user updating the item.
    - item_id: The ID of the inventory item to update.
    - updated_fields: Dictionary containing fields to update (e.g., "quantity", "used_quantity").

    Returns:
    - JSON response with the result of the update.
    """
    try:
        # Extract data from the request
        user_id = request.json.get('user_id')
        item_id = request.json.get('item_id')
        updated_fields = request.json.get('updated_fields')

        if not user_id or not item_id or not updated_fields:
            return jsonify({"error": "Missing required fields"}), 400

        # Update the inventory item
        update_success = update_inventory_item(item_id, updated_fields)
        if update_success:
            # Log the inventory update
            log_inventory_update(user_id, item_id, updated_fields)
            return jsonify({"message": "Inventory item updated successfully"}), 200
        else:
            return jsonify({"message": "Inventory item update failed"}), 400

    except Exception as e:
        return jsonify({"error": str(e)}), 500


# Get an inventory item by its ID
def get_inventory_by_id(item_id):
    """
    Retrieves an inventory item by its item_id (MongoDB ObjectId).

    Expects:
    - item_id: ID of the inventory item.

    Returns:
    - JSON response with the inventory item details.
    """
    try:
        inventory_item = get_inventory_item_by_id(item_id)
        if not inventory_item:
            return jsonify({"message": "Inventory item not found"}), 404

        return jsonify(inventory_item), 200

    except Exception as e:
        return jsonify({"error": str(e)}), 500


# Get all inventory items
def get_all_inventory():
    """
    Retrieves all inventory items.

    Returns:
    - JSON response with the list of all inventory items.
    """
    try:
        inventory_items = get_all_inventory_items()
        if not inventory_items:
            return jsonify({"message": "No inventory items found"}), 404

        return jsonify(inventory_items), 200

    except Exception as e:
        return jsonify({"error": str(e)}), 500