import sys, os
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
from fastapi import FastAPI, File, UploadFile, BackgroundTasks, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pathlib import Path
from utils import load_documents_from_directory, create_vector_store, save_embedded_data, process_directory
from pydantic import BaseModel
from search import search_and_summarize
from typing import List


app = FastAPI()


# Define allowed origins for CORS
origins = [
    "http://localhost",
    "http://localhost:8000",
    "http://localhost:3000",
    # Add other allowed origins here
]

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,  # Allows requests from listed origins
    allow_credentials=True,
    allow_methods=["*"],  # Allows all HTTP methods
    allow_headers=["*"],  # Allows all headers
)

# Define the directory where you want to save uploaded files
UPLOAD_DIR = Path("./uploads")

# Ensure the directory exists
UPLOAD_DIR.mkdir(parents=True, exist_ok=True)

class SearchRequest(BaseModel):
    query: str

def load_documents(directory: str):
    
    # loading the documents from the directory
    documents, docs_id, num_pages = load_documents_from_directory(directory)
    # embedding the documents
    embed_db = create_vector_store(documents, docs_id, num_pages)
    # saving the embedded data
    status = save_embedded_data(embed_db)
    # creating the thumbnails
    status = process_directory(directory)
    
    return {"status": "Documents loaded successfully"}

class SearchRequest(BaseModel):
    query: str

@app.post("/search/")
def search(request: SearchRequest):
    
    # Perform search using the utility function
    results = search_and_summarize(request.query)
    
    return {"results": results}

@app.post("/upload/")
async def upload_file(background_tasks: BackgroundTasks, file: UploadFile = File(...)):
    
    file_location = UPLOAD_DIR/file.filename
    
    # Save the uploaded file to the specified location
    with open(file_location, "wb") as buffer:
        buffer.write(await file.read())
    
    # Add the load_documents function to the background tasks
    background_tasks.add_task(load_documents, str(UPLOAD_DIR))
    
    # Return the location of the saved file and inform about the successful upload
    return {"message": "Upload successful. Document loading will begin shortly.", "file_location": str(UPLOAD_DIR)}


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)