import fastapi
import json,time
import uvicorn
from fastapi import HTTPException , status
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware
from fastapi import FastAPI as Response
from sse_starlette.sse import EventSourceResponse
from starlette.responses import StreamingResponse
from starlette.requests import Request
import chromadb
from chromadb.config import Settings, System
from pydantic import BaseModel
from typing import List, Dict, Any, Generator, Optional, cast, Callable
from chromadb.api.types import (
    Documents,
    Embeddings,
    EmbeddingFunction,
    IDs,
    Include,
    Metadatas,
    Where,
    WhereDocument,
    GetResult,
    QueryResult,
    CollectionMetadata,
)
from chromadb.errors import (
    ChromaError,
    InvalidUUIDError,
    InvalidDimensionException,
)
from chromadb.server.fastapi.types import (
    AddEmbedding,
    DeleteEmbedding,
    GetEmbedding,
    QueryEmbedding,
    RawSql,  # Results,
    CreateCollection,
    UpdateCollection,
    UpdateEmbedding,
)
from chromadb.api import API
from chromadb.config import System
import chromadb.utils.embedding_functions as ef
import pandas as pd
import requests
import json,os
from typing import Sequence
from chromadb.api.models.Collection import Collection
import chromadb.errors as errors
from uuid import UUID
from chromadb.telemetry import Telemetry
from overrides import override
import dropbox_handler as dbh

async def catch_exceptions_middleware(
    request: Request, call_next: Callable[[Request], Any]
) -> Response:
    try:
        return await call_next(request)
    except ChromaError as e:
        return JSONResponse(
            content={"error": e.name(), "message": e.message()}, status_code=e.code()
        )
    except Exception as e:
        return JSONResponse(content={"error": repr(e)}, status_code=500)



def _uuid(uuid_str: str) -> UUID:
    try:
        return UUID(uuid_str)
    except ValueError:
        raise InvalidUUIDError(f"Could not parse {uuid_str} as a UUID")

dbh.restoreFolder("/index/chroma")

app = fastapi.FastAPI(title="ChromaDB")
app.middleware("http")(catch_exceptions_middleware)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
api_base="/api/v1"
embedding_function=ef.DefaultEmbeddingFunction()
bkend=chromadb.Client(Settings(
            chroma_db_impl="duckdb+parquet",
            persist_directory="./index/chroma" # Optional, defaults to .chromadb/ in the current directory
        ))

class PathRequest(BaseModel):
    dir: str = "/"
    
@app.get(api_base+"")
def heartbeat():
    print("Received heartbeat request")
    return {"nanosecond heartbeat":int(time.time_ns())}

@app.get("/info")
def read_info(request: Request):
    print(request)
    request_method = request.method
    request_headers = request.headers
    request_body = request.body
    print(request_headers)
    response= JSONResponse(content= {"nanosecond heartbeat":int(time.time_ns())})
    response.set_cookie(key="my_cookie", value="12345", httponly=True, secure=True)
    return response

@app.post(api_base+"/reset")
def reset():
    print("Received reset request")
    dbh.restoreFolder("/index/chroma")
    return bkend.reset()

@app.get(api_base+"/version")
def version():
    print("Received version request")
    return bkend.get_version()

@app.post(api_base+"/persist")
def persist():
    print("Received persist request")
    retVal=bkend.persist()
    dbh.backupFolder("/index/chroma")
    return retVal

@app.post(api_base+"/raw_sql")
def raw_sql(raw_sql: RawSql):
    print("Received raw_sql request")
    return bkend.raw_sql(raw_sql.raw_sql)

@app.post(api_base+"/walk")
def walk(path: PathRequest):
    print("Received walk request")
    dirs=[]
    try:
        for root, items, files in os.walk(path.dir,topdown=True):
            for item in items:
                dirs.append(item)
    except Exception:
        print("got exception",Exception)
    response= JSONResponse(content= {"dirs":dirs})
    return response

@app.get(api_base+"/heartbeat")
def heartbeat1():
    print("Received heartbeat1 request")
    return heartbeat()

@app.get(api_base+"/collections")
def list_collections(request: Request):
    print("Received list_collections request")
    print(request.cookies)
    return bkend.list_collections()

@app.post(api_base+"/collections")
def create_collection( request: Request, collection: CreateCollection ) :
    print("Received request to create_collection")
    print(request.cookies)
    return bkend.create_collection(name=collection.name,metadata=collection.metadata,embedding_function=embedding_function,get_or_create=collection.get_or_create)

@app.get(api_base+"/collections/{collection_name}")
def get_collection( request: Request,collection_name: str) :
    print("Received get_collection request")
    print(request.cookies)
    return bkend.get_collection(collection_name,embedding_function=embedding_function)

@app.post(api_base+"/collections/{collection_id}/add")
def add(collection_id:str , add:AddEmbedding) -> None:
    print("Received add request")
    try:
        result=bkend._add(collection_id=_uuid(collection_id),embeddings=add.embeddings,metadatas=add.metadatas,documents=add.documents,ids=add.ids,increment_index=add.increment_index)
    except InvalidDimensionException as e:
            raise HTTPException(status_code=500, detail=str(e))
    print(result)
    return result   

@app.post(api_base+"/collections/{collection_id}/update")
def update(collection_id:str , update:UpdateEmbedding) -> None:
    print("Received update request")
    return bkend._update(ids=update.ids, collection_id=_uuid(collection_id), embeddings=update.embeddings, documents=update.documents, metadatas=update.metadatas)
        
@app.post(api_base+"/collections/{collection_id}/upsert")
def upsert(collection_id:str, upsert: AddEmbedding):
    print("Received upsert request")
    #try:
    #    print("Received upsert request",upsert)
    #except Exception:
    #    pass
    return bkend._upsert(collection_id=_uuid(collection_id),embeddings=upsert.embeddings,metadatas=upsert.metadatas,documents=upsert.documents,ids=upsert.ids,increment_index=upsert.increment_index)
        
@app.post(api_base+"/collections/{collection_id}/get") 
def get( collection_id: str, get: GetEmbedding) -> GetResult:
    print("Received get request")
    return bkend._get(collection_id=_uuid(collection_id), ids=get.ids, where=get.where,
            where_document=get.where_document, sort=get.sort, limit=get.limit,
            offset=get.offset, include=get.include)
        
@app.post(api_base+"/collections/{collection_id}/delete")
def delete(collection_id: str, delete: DeleteEmbedding) -> List[UUID]:
    print("Received delete request")
    return bkend._delete(where=delete.where, ids=delete.ids,
            collection_id=_uuid(collection_id), where_document=delete.where_document)
        
@app.get(api_base+"/collections/{collection_id}/count")
def count(collection_id:str) ->int:
    print("Received count request")
    return bkend._count(_uuid(collection_id))
        
@app.post(api_base+"/collections/{collection_id}/query")
def get_nearest_neighbors(collection_id: str, query: QueryEmbedding) -> QueryResult:
    print("Received get_nearest_neighbors request")
    return bkend._query(collection_id=_uuid(collection_id), where=query.where,  where_document=query.where_document, 
              query_embeddings=query.query_embeddings, n_results=query.n_results, include=query.include)
        
@app.post(api_base+"/collections/{collection_name}/create_index")
def create_index(collection_name:str)-> bool:
    print("Received create_index request")
    return bkend.create_index(collection_name)
        
@app.put(api_base+"/collections/{collection_id}")
def modify(collection_id: str, collection: UpdateCollection) -> None:
    print("Received modify-collection request")
    return bkend._modify(id=_uuid(collection_id), new_name=collection.new_name, new_metadata=collection.new_metadata)
        
@app.delete(api_base+"/collections/{collection_name}")
def delete_collection(collection_name:str) -> None:
    print("Received delete_collection request")
    return bkend.delete_collection(collection_name)


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