import os
import csv
from datetime import datetime
from constants import EMBEDDING_MODEL_NAME
from langchain.embeddings import HuggingFaceInstructEmbeddings
from langchain.embeddings import HuggingFaceBgeEmbeddings
from langchain.embeddings import HuggingFaceEmbeddings


def log_to_csv(question, answer):

    log_dir, log_file = "local_chat_history", "qa_log.csv"
    # Ensure log directory exists, create if not
    if not os.path.exists(log_dir):
        os.makedirs(log_dir)

    # Construct the full file path
    log_path = os.path.join(log_dir, log_file)

    # Check if file exists, if not create and write headers
    if not os.path.isfile(log_path):
        with open(log_path, mode="w", newline="", encoding="utf-8") as file:
            writer = csv.writer(file)
            writer.writerow(["timestamp", "question", "answer"])

    # Append the log entry
    with open(log_path, mode="a", newline="", encoding="utf-8") as file:
        writer = csv.writer(file)
        timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
        writer.writerow([timestamp, question, answer])


def get_embeddings(device_type="cuda"):
    if "instructor" in EMBEDDING_MODEL_NAME:
        return HuggingFaceInstructEmbeddings(
            model_name=EMBEDDING_MODEL_NAME,
            model_kwargs={"device": device_type},
            embed_instruction="Represent the document for retrieval:",
            query_instruction="Represent the question for retrieving supporting documents:",
        )

    elif "bge" in EMBEDDING_MODEL_NAME:
        return HuggingFaceBgeEmbeddings(
            model_name=EMBEDDING_MODEL_NAME,
            model_kwargs={"device": device_type},
            query_instruction="Represent this sentence for searching relevant passages:",
        )

    else:
        return HuggingFaceEmbeddings(
            model_name=EMBEDDING_MODEL_NAME,
            model_kwargs={"device": device_type},
        )