import requests
from langchain_core.messages import SystemMessage , HumanMessage , FunctionMessage
from .state import State
from .schemas import ResponseFormatter , CompareBodyFormatter, LatestMessageFormatter, ParameterFormatter, EndpointFormatter
from .prompts import chatbot_prompt , get_body_prompt , fetch_last_message_prompt , fetch_parameters_prompt, fetch_endpoint_prompt
from .utils import generate_api_knowledge , process_query, get_endpoint_info
from src.genai.utils.models_loader import llm_gpt
import numpy as np
from src.genai.utils.data_loader import api_knowledge_df, api_index
from src.genai.utils.models_loader import embedding_model

class FetchLastMessage:
    def __init__(self):
        self.llm = llm_gpt
    
    def run (self, state:State):
        print('Message:',state['messages'])
        template = fetch_last_message_prompt
        messages=[SystemMessage(content=template)]+state['messages']
        result = self.llm.with_structured_output(LatestMessageFormatter, method='function_calling').invoke(messages)
        print('Latest Message:', process_query(result.latest_message))
        if len(state['messages'])>11:
            state["messages"] = state["messages"][-9:]
        return {
            'latest_message': process_query(result.latest_message)
        }
        

class RetrievePossibleEndpoints:
    def __init__(self):
        self.df = api_knowledge_df
        self.index = api_index
        self.results = []

    def run(self,state:State):
        query_embedding = np.array(embedding_model.embed_query(state['latest_message'])).reshape(1, -1).astype('float32')
        distances, indices = self.index.search(query_embedding, 5)
        for idx in indices[0]:
            row = self.df.iloc[idx]
            print('Endpoint:',row['endpoint'])
            self.results.append(row['endpoint'])
        print('The possible endpoints are:', self.results)
        return {
            "possible_endpoints": self.results,
        }

class RetrieveExactEndpoint:
    def __init__(self):
        self.llm = llm_gpt
    
    def run(self,state:State):
        messages = [SystemMessage(content=fetch_endpoint_prompt),
                    FunctionMessage(name='possible_endpoints',content=f'''The possible endpoints are: {state['possible_endpoints']}'''),
                    HumanMessage(content=f'''The user query is: {state['latest_message']}''')]
        
        result = self.llm.with_structured_output(EndpointFormatter, method='function_calling').invoke(messages)
        print('The exact endpoint is:', result.endpoint)
        endpoint_info=get_endpoint_info(result.endpoint)
        print('The endpoint info is:', endpoint_info)

        return {
            "messages":[{"role": "assistant", "content": f'''The endpoint is: {result.endpoint}'''}],
            "endpoint": result.endpoint,
            "method": endpoint_info['method'],
            "needed_parameters": endpoint_info["parameters"]
        }
        
     
class FetchParametersNode:
    def __init__(self):
        self.llm = llm_gpt
    
    def run(self , state:State):
        print('Entered to fetch parameters')
        print(state['method'])
        if state['method'] == 'GET':
            print('Condition satisfied')
            template = fetch_parameters_prompt
            messages=[SystemMessage(content=template),
                    HumanMessage(content=f'''The query is: {state['latest_message']}\n. The needed parameters: {str(state['needed_parameters'])}''')
                    ]
            print('messages:', messages)
            result = self.llm.with_structured_output(ParameterFormatter, method='function_calling').invoke(messages)
            parameters_values={key: process_query(value) for key, value in result.parameters_values.items()}
            print('The parameter values:', parameters_values)
            return {
                'parameters_values':parameters_values
            }
        else:
            return{
                'parameters_values': {}
            }
        


class ChatbotNode:
    def __init__(self):
        self.llm = llm_gpt
    
    def run(self, state:State):
        print('Message:',state['messages'])
        template = chatbot_prompt()
        knowledge_base = generate_api_knowledge('https://reveltrends.vercel.app')
        print('The knowledge base is:', knowledge_base)
        messages = [SystemMessage(content=template), 
                    FunctionMessage(name='analytics_chatbot',content=str(knowledge_base)),
                    ] + state["messages"]
        if len(state['messages'])>11:
            state["messages"] = state["messages"][-9:]
        print('Messages:', state['messages'])
        print(len(state['messages']))
        result = self.llm.with_structured_output(ResponseFormatter, method='function_calling').invoke(messages)
        print('The result is:',result)
        return {
        "messages": [{"role": "assistant", "content": f'''The endpoint is: {result.endpoint}. The parameters are: {result.parameters}'''}],
        "endpoint": result.endpoint,
        "method": result.method,
        "parameters": result.parameters,
    }

class FetchDataNode:
    def __init__(self):
        self.llm = llm_gpt
        self.base_url = 'https://reveltrends.vercel.app'
        self.headers = {
            "Authorization": "Bearer YOUR_API_KEY",  # replace with your API key if needed
            "Content-Type": "application/json"
            }

    def run(self, state:State):
        print('Entered to fetch data')
        url = f'''{self.base_url}{state['endpoint']}'''
        if state['method'] == 'GET':
            response = requests.get(url, params=state['parameters_values'],headers=self.headers)
        elif state['endpoint'] == '/api/v1/compare/':
            print('Condition satisfied')
            messages = [SystemMessage(content=get_body_prompt()), 
            HumanMessage(content=str(state['messages']))]
            response=llm_gpt.with_structured_output(CompareBodyFormatter , method='function_calling').invoke(messages)
            print('INF names response:', response)
            payload = {
            "usernames": list(map(process_query,response.names)),
            "freq": response.frequency          
             }
            
            print('The payload is:',payload)
            
            headers = {
            "Content-Type": "application/json"
             }

            response = requests.post(url, json=payload, headers=headers)

        return {'response':response.json()}