# Adapter for OCI Generative AI Agent

from langchain_core.prompts import PromptTemplate, ChatPromptTemplate
from langchain.agents import AgentExecutor, create_tool_calling_agent
from langchain.tools import BaseTool, StructuredTool, Tool, tool
from langchain_community.chat_models.oci_generative_ai import ChatOCIGenAI
import requests
from requests.auth import HTTPBasicAuth

user_name = "#######################"
password = "#######################"

order_list = []  # Persistence for Order

#--------------------------------------------------------------------------
# REST SERVICES

def get_rest_service_auth(url):
    response = requests.get(url, auth=HTTPBasicAuth(user_name, password))
    if response.status_code == 200:
        return response.json()
    else:
        print(f"Service request error. Status code: {response.status_code}")
        return None

def get_rest_service(url):
    response = requests.get(url)
    if response.status_code == 200:
        return response.text
    else:
        print(f"Service request error. Status code: {response.status_code}")
        return None

def post_request(url, data, headers=None):
    try:
        response = requests.post(url, json=data, headers=headers)
        response.raise_for_status()
        return response.json()
    except requests.exceptions.RequestException as e:
        print(f"Request Error: {e}")
        return None

#--------------------------------------------------------------------------
# BUSINESS SERVICES

@tool
def insert_order(items):
    """Create an order with items. The customer can ask for items from a restaurant. The customer wants to include an item."""
    global order_list
    order_list.extend(items)  # Adds new items to the order
    print("Item(s) added:", items)
    return {"message": "Items added to order", "current_order": order_list}

@tool
def delete_order(item):
    """Delete an item from the order. The customer may change their mind about one or more items.
    The customer can request to delete an item from a restaurant order.
    The customer may ask to 'Remove the item', 'I don't want the item anymore', or 'Delete the item'."""
    global order_list
    print("Trying to remove:", item)
    for global_item in order_list:
        if global_item in item:
            order_list.remove(global_item)
            print("Item(s) removed:", global_item)
    return {"message": "Item removed from order", "current_order": order_list}

@tool
def search_order():
    """Search an order with items."""
    global order_list
    print("Current items in order:", order_list)
    return {"message": "Current order details", "current_order": order_list}

@tool
def order_cost():
    """This service provides the total cost of the order, summarizing the items.
    If the customer asks 'give me the bill', 'summarize the order', 'what is the total', or 'how much is it'."""
    global order_list
    if not order_list:
        return {"message": "No items in the order"}

    total = len(order_list) * 10  # Assuming each item costs 10
    print("Total: $", total)
    return {"total_cost": total, "order_items": order_list}

@tool
def delivery_address(postalCode: str, number: str = "", complement: str = "") -> str:
    """Find the complete address of a postal code to delivery, along with the building number and complement.
    The customer can ask for 'delivery to' or 'my address is'. postalCode normally is the postal code or CEP,
    number is the number of buiding and complenent is the apartment or other complement for the address. always confirm the address
    and the total cost of order."""

    url = f"https://cihjkhlijtmunsiiokgrhetowu.apigateway.us-ashburn-1.oci.customer-oci.com/cep/cep?cep={postalCode}"
    response = get_rest_service_auth(url)

    address = response["frase"]
    full_address = f"{address}, Number: {number}, Complement: {complement}"
    print(full_address)
    return str(full_address)

#--------------------------------------------------------------------------

tools = [insert_order, order_cost, search_order, delivery_address, delete_order]


# PROMPT AND CONTEXT

prompt = ChatPromptTemplate.from_messages(
    [
        ("system", """You are an assistant that helps customers place orders at a restaurant.
        After a customer adds an item to the order, always inform them of the total.
        If the customer provides a postal code (ZIP), use the find_address tool to get the complete address.
        The customer can check their order at any time. They may request delivery by saying 'deliver to' or 'my address is' followed by the postal code, ZIP code, or street name."""),
        ("placeholder", "{chat_history}"),
        ("human", "{input}"),
        ("placeholder", "{agent_scratchpad}"),
    ]
)

#--------------------------------------------------------------------------
# OCI Generative AI DEFINITIONS

llm = ChatOCIGenAI(
    model_id="cohere.command-r-08-2024",
    service_endpoint="https://inference.generativeai.us-chicago-1.oci.oraclecloud.com",
    compartment_id="ocid1.compartment.oc1..aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
    auth_profile="LATINOAMERICA",  # replace with your profile name,
    model_kwargs={"temperature": 0.1, "top_p": 0.75, "max_tokens": 2000}
)

agent = create_tool_calling_agent(llm, tools, prompt)

agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=False)

#--------------------------------------------------------------------------
# CHAT

print("READY")

while (True):
    try:
        query = input()
        if query == "quit":
            break
        response = agent_executor.invoke({
            "input": query
        }
        )
        print(response)
    except:
        print("Invalid Command")