app.py

from fastapi import FastAPI
from langchain_core.messages.base import message_to_dict
from .models import Agent, OutputCollector, APIEndpoint
from .chains import GeneralStates, build_chain, agent_builder
# from chains import *
from langgraph.checkpoint.memory import MemorySaver
from langchain_core.messages import AIMessage, HumanMessage, SystemMessage
from langgraph.graph import StateGraph, MessagesState, START, END
from datetime import datetime

from typing import List

app = FastAPI()
checkpointer = MemorySaver()


projects_chains = {

}

projects_agents = {

}

projects_output_collectors = {

}

projects_input_api_endpoints = {

}

projects_output_api_endpoints = {

}


@app.post("/agents")
def create_agent(data: Agent):
    current_time = datetime.utcnow()
    data_dict = data.dict()
    data_dict["created_at"] = current_time
    data_dict["updated_at"] = current_time
    data_dict["deleted_at"] = None

    if data_dict["output_collector"]:
        project_collectors = projects_output_collectors.get(data_dict['project_id'])
        collector = project_collectors.get(data_dict['output_collector'])
        data_dict["output_collector"] = [f"{collector['keys'][i]}: {collector['data_types'][i]} = {collector['descriptions'][i]}" for i in range(len(collector['keys']))]
    if data_dict["input_api_endpoints"]:
        project_input_api = projects_input_api_endpoints.get(data_dict['project_id'])
        input_api = [project_input_api.get(inp) for inp in data_dict['input_api_endpoints']]
        data_dict['input_api_endpoints'] = input_api
    if data_dict["output_api_endpoints"]:
        project_output_api = projects_output_api_endpoints.get(data_dict['project_id'])
        output_api = [project_output_api.get(out) for out in data_dict['output_api_endpoints']]
        data_dict['output_api_endpoints'] = output_api

    if not projects_agents.get(data_dict['project_id']):
        projects_agents[data_dict['project_id']] = {data_dict['id']: data_dict}
    else:
        projects_agents[data_dict['project_id']].update({data_dict['id']: data_dict})


    return {"message": "Agent created", "data": data_dict}


@app.post("/output_collectors")
def create_output_collector(data: OutputCollector):
    current_time = datetime.utcnow()
    data_dict = data.dict()
    data_dict["created_at"] = current_time
    data_dict["updated_at"] = current_time
    data_dict["deleted_at"] = None
    if not projects_output_collectors.get(data_dict['project_id']):
        projects_output_collectors[data_dict['project_id']] = {data_dict['id']: data_dict}
    else:
        projects_output_collectors[data_dict['project_id']].update({data_dict['id']: data_dict})
    return {"message": "Output Collector created", "data": data_dict}


@app.post("/output_api_endpoints")
def create_input_api(data: APIEndpoint):
    current_time = datetime.utcnow()
    data_dict = data.dict()
    data_dict["created_at"] = current_time
    data_dict["updated_at"] = current_time
    data_dict["deleted_at"] = None
    if not projects_input_api_endpoints.get(data_dict['project_id']):
        projects_input_api_endpoints[data_dict['project_id']] = {data_dict['id']: data_dict}
    else:
        projects_input_api_endpoints[data_dict['project_id']].update({data_dict['id']: data_dict})
    return {"message": "Input API Endpoint created", "data": data_dict}


@app.post("/output_api_endpoints")
def create_output_api(data: APIEndpoint):
    current_time = datetime.utcnow()
    data_dict = data.dict()
    data_dict["created_at"] = current_time
    data_dict["updated_at"] = current_time
    data_dict["deleted_at"] = None
    if not projects_output_api_endpoints.get(data_dict['project_id']):
        projects_output_api_endpoints[data_dict['project_id']] = {data_dict['id']: data_dict}
    else:
        projects_output_api_endpoints[data_dict['project_id']].update({data_dict['id']: data_dict})
    return {"message": "Output API Endpoint created", "data": data_dict}


@app.post("/build_chain")
def create_chain(project_id: str, id:str, chains: List[dict], welcome_message: str):
    current_time = datetime.utcnow()
    # data_dict = {}

    # builder = StateGraph(GeneralStates)
    agents = projects_agents.get(project_id)

    def update_key(data, key_field, agents):
        if isinstance(data, dict):
            # If the current item is a dictionary, update the "key" field if it exists
            if key_field in data:
                data[key_field] = agents[data[key_field]]
                update_key(data["child"], key_field, agents)
            # Recursively process all values in the dictionary
            # for key, value in data.items():
                # update_key(value, key_field, agents)
        elif isinstance(data, list):
            # If the current item is a list, recursively process each item in the list
            for item in data:
                update_key(item, key_field, agents)

    print("[CHAIN PREV]", chains)

    update_key(chains, "agent", agents)

    print("[CHAIN NEW]", chains)

    graph = build_chain(chains, checkpointer)

    # for start_point in chains:
    #   builder.add_edge(START, start_point["id"])

    # graph = builder.compile(checkpointer=checkpointer)

    if not projects_chains.get(project_id):
        projects_chains[project_id] = {id: graph}
    else:
        projects_chains[project_id].update({id: graph})

    # if projects_chains.get(project_id):
    #     projects_chains.append(graph)
    # else:
    #     projects_chains[project_id] = [graph]

    # data_dict["created_at"] = current_time
    # data_dict["updated_at"] = current_time
    # data_dict["deleted_at"] = None
    return {"message": "Chain created", "data": chains}


@app.get("/{project_id}/{id}/run")
def run(project_id: str, id: str, session_id:str, message:str="Hello world!"):
    chain = projects_chains.get(project_id)
    graph = None

    if chain:
        graph = chain.get(id)

    if graph == None:
        agent = projects_agents.get(project_id)
        if agent:
            runnable = agent.get(id)
            # print("[AGENT]", runnable)
            chains = [{
                "id":"123",
                "agent":runnable,
                "checkpoint":False,
                "condition":None,
                "condition_from":None,
                "child":[]
            }]


            graph = build_chain(chains, agent, checkpointer)

            # for start_point in chains:
            #   builder.add_edge(START, start_point["id"])

            # graph = builder.compile(checkpointer=checkpointer)

            print("[GRAPH]", graph)

            # agent_builder(chain={}, row=0, depth=0)
        else:
            return {"Error":"Agent or Chain does not exists!", "status_code":401}


    # print("[NODES]", builder.nodes)
    # print("[EDGES]", builder.edges)

    # for chunk in graph.stream(
    #   {"messages": [HumanMessage(message)]},
    #   {"configurable": {"thread_id": session_id}},
    #   stream_mode="values",
    # ):
    #   print("[CHUNK]", chunk)

    out = graph.invoke(
        {
          "messages": [HumanMessage(message)],
          "variables": {"user_input":message}
        },
        {"configurable": {"thread_id": session_id}}
    )
    return {"results":out["messages"][-1].content}


@app.get("/agents")
def get_agents():
    return {"results":projects_agents}

@app.get("/")
def greet_json():
    return {"Hello": "World!"}