import datetime
import json
import logging
import mimetypes
import os
import shutil
import string
import tempfile
import zipfile

from collections import Counter
from urllib.parse import urljoin

import requests
from bson.dbref import DBRef
from bson.objectid import ObjectId

from application.agents.agent_creator import AgentCreator
from application.api.answer.routes import get_prompt

from application.core.mongo_db import MongoDB
from application.core.settings import settings
from application.parser.chunking import Chunker
from application.parser.embedding_pipeline import embed_and_store_documents
from application.parser.file.bulk import SimpleDirectoryReader
from application.parser.remote.remote_creator import RemoteCreator
from application.parser.schema.base import Document
from application.retriever.retriever_creator import RetrieverCreator

from application.storage.storage_creator import StorageCreator
from application.utils import count_tokens_docs, num_tokens_from_string

mongo = MongoDB.get_client()
db = mongo[settings.MONGO_DB_NAME]
sources_collection = db["sources"]

# Constants
MIN_TOKENS = 150
MAX_TOKENS = 1250
RECURSION_DEPTH = 2


# Define a function to extract metadata from a given filename.
def metadata_from_filename(title):
    return {"title": title}


# Define a function to generate a random string of a given length.
def generate_random_string(length):
    return "".join([string.ascii_letters[i % 52] for i in range(length)])


current_dir = os.path.dirname(
    os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
)


def extract_zip_recursive(zip_path, extract_to, current_depth=0, max_depth=5):
    """
    Recursively extract zip files with a limit on recursion depth.

    Args:
        zip_path (str): Path to the zip file to be extracted.
        extract_to (str): Destination path for extracted files.
        current_depth (int): Current depth of recursion.
        max_depth (int): Maximum allowed depth of recursion to prevent infinite loops.
    """
    if current_depth > max_depth:
        logging.warning(f"Reached maximum recursion depth of {max_depth}")
        return

    try:
        with zipfile.ZipFile(zip_path, "r") as zip_ref:
            zip_ref.extractall(extract_to)
        os.remove(zip_path)  # Remove the zip file after extracting
    except Exception as e:
        logging.error(f"Error extracting zip file {zip_path}: {e}", exc_info=True)
        return

    # Check for nested zip files and extract them
    for root, dirs, files in os.walk(extract_to):
        for file in files:
            if file.endswith(".zip"):
                # If a nested zip file is found, extract it recursively
                file_path = os.path.join(root, file)
                extract_zip_recursive(file_path, root, current_depth + 1, max_depth)


def download_file(url, params, dest_path):
    try:
        response = requests.get(url, params=params)
        response.raise_for_status()
        with open(dest_path, "wb") as f:
            f.write(response.content)
    except requests.RequestException as e:
        logging.error(f"Error downloading file: {e}")
        raise


def upload_index(full_path, file_data):
    try:
        if settings.VECTOR_STORE == "faiss":
            files = {
                "file_faiss": open(full_path + "/index.faiss", "rb"),
                "file_pkl": open(full_path + "/index.pkl", "rb"),
            }
            response = requests.post(
                urljoin(settings.API_URL, "/api/upload_index"),
                files=files,
                data=file_data,
            )
        else:
            response = requests.post(
                urljoin(settings.API_URL, "/api/upload_index"), data=file_data
            )
        response.raise_for_status()
    except requests.RequestException as e:
        logging.error(f"Error uploading index: {e}")
        raise
    finally:
        if settings.VECTOR_STORE == "faiss":
            for file in files.values():
                file.close()


def run_agent_logic(agent_config, input_data):
    try:
        source = agent_config.get("source")
        retriever = agent_config.get("retriever", "classic")
        if isinstance(source, DBRef):
            source_doc = db.dereference(source)
            source = str(source_doc["_id"])
            retriever = source_doc.get("retriever", agent_config.get("retriever"))
        else:
            source = {}
        source = {"active_docs": source}
        chunks = int(agent_config.get("chunks", 2))
        prompt_id = agent_config.get("prompt_id", "default")
        user_api_key = agent_config["key"]
        agent_type = agent_config.get("agent_type", "classic")
        decoded_token = {"sub": agent_config.get("user")}
        prompt = get_prompt(prompt_id)
        agent = AgentCreator.create_agent(
            agent_type,
            endpoint="webhook",
            llm_name=settings.LLM_NAME,
            gpt_model=settings.MODEL_NAME,
            api_key=settings.API_KEY,
            user_api_key=user_api_key,
            prompt=prompt,
            chat_history=[],
            decoded_token=decoded_token,
            attachments=[],
        )
        retriever = RetrieverCreator.create_retriever(
            retriever,
            source=source,
            chat_history=[],
            prompt=prompt,
            chunks=chunks,
            token_limit=settings.DEFAULT_MAX_HISTORY,
            gpt_model=settings.MODEL_NAME,
            user_api_key=user_api_key,
            decoded_token=decoded_token,
        )
        answer = agent.gen(query=input_data, retriever=retriever)
        response_full = ""
        thought = ""
        source_log_docs = []
        tool_calls = []

        for line in answer:
            if "answer" in line:
                response_full += str(line["answer"])
            elif "sources" in line:
                source_log_docs.extend(line["sources"])
            elif "tool_calls" in line:
                tool_calls.extend(line["tool_calls"])
            elif "thought" in line:
                thought += line["thought"]

        result = {
            "answer": response_full,
            "sources": source_log_docs,
            "tool_calls": tool_calls,
            "thought": thought,
        }
        logging.info(f"Agent response: {result}")
        return result
    except Exception as e:
        logging.error(f"Error in run_agent_logic: {e}", exc_info=True)
        raise


# Define the main function for ingesting and processing documents.
def ingest_worker(
    self, directory, formats, name_job, filename, user, retriever="classic"
):
    """
    Ingest and process documents.

    Args:
        self: Reference to the instance of the task.
        directory (str): Specifies the directory for ingesting ('inputs' or 'temp').
        formats (list of str): List of file extensions to consider for ingestion (e.g., [".rst", ".md"]).
        name_job (str): Name of the job for this ingestion task.
        filename (str): Name of the file to be ingested.
        user (str): Identifier for the user initiating the ingestion.
        retriever (str): Type of retriever to use for processing the documents.

    Returns:
        dict: Information about the completed ingestion task, including input parameters and a "limited" flag.
    """
    input_files = None
    recursive = True
    limit = None
    exclude = True
    sample = False

    storage = StorageCreator.get_storage()

    full_path = os.path.join(directory, user, name_job)
    source_file_path = os.path.join(full_path, filename)

    logging.info(f"Ingest file: {full_path}", extra={"user": user, "job": name_job})

    # Create temporary working directory
    with tempfile.TemporaryDirectory() as temp_dir:
        try:
            os.makedirs(temp_dir, exist_ok=True)

            # Download file from storage to temp directory
            temp_file_path = os.path.join(temp_dir, filename)
            file_data = storage.get_file(source_file_path)

            with open(temp_file_path, "wb") as f:
                f.write(file_data.read())

            self.update_state(state="PROGRESS", meta={"current": 1})

            # Handle zip files
            if filename.endswith(".zip"):
                logging.info(f"Extracting zip file: {filename}")
                extract_zip_recursive(
                    temp_file_path, temp_dir, current_depth=0, max_depth=RECURSION_DEPTH
                )

            if sample:
                logging.info(f"Sample mode enabled. Using {limit} documents.")

            reader = SimpleDirectoryReader(
                input_dir=temp_dir,
                input_files=input_files,
                recursive=recursive,
                required_exts=formats,
                exclude_hidden=exclude,
                file_metadata=metadata_from_filename,
            )
            raw_docs = reader.load_data()

            chunker = Chunker(
                chunking_strategy="classic_chunk",
                max_tokens=MAX_TOKENS,
                min_tokens=MIN_TOKENS,
                duplicate_headers=False,
            )
            raw_docs = chunker.chunk(documents=raw_docs)

            docs = [Document.to_langchain_format(raw_doc) for raw_doc in raw_docs]

            id = ObjectId()

            vector_store_path = os.path.join(temp_dir, "vector_store")
            os.makedirs(vector_store_path, exist_ok=True)

            embed_and_store_documents(docs, vector_store_path, id, self)

            tokens = count_tokens_docs(docs)

            self.update_state(state="PROGRESS", meta={"current": 100})

            if sample:
                for i in range(min(5, len(raw_docs))):
                    logging.info(f"Sample document {i}: {raw_docs[i]}")
            file_data = {
                "name": name_job,
                "file": filename,
                "user": user,
                "tokens": tokens,
                "retriever": retriever,
                "id": str(id),
                "type": "local",
                "original_file_path": source_file_path,  # Pass the original file path
            }

            upload_index(vector_store_path, file_data)

        except Exception as e:
            logging.error(f"Error in ingest_worker: {e}", exc_info=True)
            raise

    return {
        "directory": directory,
        "formats": formats,
        "name_job": name_job,
        "filename": filename,
        "user": user,
        "limited": False,
    }


def remote_worker(
    self,
    source_data,
    name_job,
    user,
    loader,
    directory="temp",
    retriever="classic",
    sync_frequency="never",
    operation_mode="upload",
    doc_id=None,
):
    full_path = os.path.join(directory, user, name_job)
    if not os.path.exists(full_path):
        os.makedirs(full_path)

    self.update_state(state="PROGRESS", meta={"current": 1})
    try:
        logging.info("Initializing remote loader with type: %s", loader)
        remote_loader = RemoteCreator.create_loader(loader)
        raw_docs = remote_loader.load_data(source_data)

        chunker = Chunker(
            chunking_strategy="classic_chunk",
            max_tokens=MAX_TOKENS,
            min_tokens=MIN_TOKENS,
            duplicate_headers=False,
        )
        docs = chunker.chunk(documents=raw_docs)
        docs = [Document.to_langchain_format(raw_doc) for raw_doc in raw_docs]
        tokens = count_tokens_docs(docs)
        logging.info("Total tokens calculated: %d", tokens)

        if operation_mode == "upload":
            id = ObjectId()
            embed_and_store_documents(docs, full_path, id, self)
        elif operation_mode == "sync":
            if not doc_id or not ObjectId.is_valid(doc_id):
                logging.error("Invalid doc_id provided for sync operation: %s", doc_id)
                raise ValueError("doc_id must be provided for sync operation.")
            id = ObjectId(doc_id)
            embed_and_store_documents(docs, full_path, id, self)

        self.update_state(state="PROGRESS", meta={"current": 100})

        file_data = {
            "name": name_job,
            "user": user,
            "tokens": tokens,
            "retriever": retriever,
            "id": str(id),
            "type": loader,
            "remote_data": source_data,
            "sync_frequency": sync_frequency,
        }
        upload_index(full_path, file_data)

    except Exception as e:
        logging.error("Error in remote_worker task: %s", str(e), exc_info=True)
        raise

    finally:
        if os.path.exists(full_path):
            shutil.rmtree(full_path)

    logging.info("remote_worker task completed successfully")
    return {"urls": source_data, "name_job": name_job, "user": user, "limited": False}


def sync(
    self,
    source_data,
    name_job,
    user,
    loader,
    sync_frequency,
    retriever,
    doc_id=None,
    directory="temp",
):
    try:
        remote_worker(
            self,
            source_data,
            name_job,
            user,
            loader,
            directory,
            retriever,
            sync_frequency,
            "sync",
            doc_id,
        )
    except Exception as e:
        logging.error(f"Error during sync: {e}", exc_info=True)
        return {"status": "error", "error": str(e)}
    return {"status": "success"}


def sync_worker(self, frequency):
    sync_counts = Counter()
    sources = sources_collection.find()
    for doc in sources:
        if doc.get("sync_frequency") == frequency:
            name = doc.get("name")
            user = doc.get("user")
            source_type = doc.get("type")
            source_data = doc.get("remote_data")
            retriever = doc.get("retriever")
            doc_id = str(doc.get("_id"))
            resp = sync(
                self, source_data, name, user, source_type, frequency, retriever, doc_id
            )
            sync_counts["total_sync_count"] += 1
            sync_counts[
                "sync_success" if resp["status"] == "success" else "sync_failure"
            ] += 1

    return {
        key: sync_counts[key]
        for key in ["total_sync_count", "sync_success", "sync_failure"]
    }


def attachment_worker(self, file_info, user):
    """
    Process and store a single attachment without vectorization.
    """

    mongo = MongoDB.get_client()
    db = mongo[settings.MONGO_DB_NAME]
    attachments_collection = db["attachments"]

    filename = file_info["filename"]
    attachment_id = file_info["attachment_id"]
    relative_path = file_info["path"]
    metadata = file_info.get("metadata", {})

    try:
        self.update_state(state="PROGRESS", meta={"current": 10})
        storage = StorageCreator.get_storage()
        
        self.update_state(
            state="PROGRESS", meta={"current": 30, "status": "Processing content"}
        )

        content = storage.process_file(
            relative_path,
            lambda local_path, **kwargs: SimpleDirectoryReader(
                input_files=[local_path], exclude_hidden=True, errors="ignore"
            ).load_data()[0].text
        )
            
        token_count = num_tokens_from_string(content)

        self.update_state(
            state="PROGRESS", meta={"current": 80, "status": "Storing in database"}
        )

        mime_type = mimetypes.guess_type(filename)[0] or "application/octet-stream"

        doc_id = ObjectId(attachment_id)
        attachments_collection.insert_one(
            {
                "_id": doc_id,
                "user": user,
                "path": relative_path,
                "filename": filename,
                "content": content,
                "token_count": token_count,
                "mime_type": mime_type,
                "date": datetime.datetime.now(),
                "metadata": metadata,
            }
        )

        logging.info(
            f"Stored attachment with ID: {attachment_id}", extra={"user": user}
        )

        self.update_state(
            state="PROGRESS", meta={"current": 100, "status": "Complete"}
        )

        return {
            "filename": filename,
            "path": relative_path,
            "token_count": token_count,
            "attachment_id": attachment_id,
            "mime_type": mime_type,
            "metadata": metadata,
        }

    except Exception as e:
        logging.error(
            f"Error processing file {filename}: {e}",
            extra={"user": user},
            exc_info=True,
        )
        raise


def agent_webhook_worker(self, agent_id, payload):
    """
    Process the webhook payload for an agent.

    Args:
        self: Reference to the instance of the task.
        agent_id (str): Unique identifier for the agent.
        payload (dict): The payload data from the webhook.

    Returns:
        dict: Information about the processed webhook.
    """
    mongo = MongoDB.get_client()
    db = mongo["docsgpt"]
    agents_collection = db["agents"]

    self.update_state(state="PROGRESS", meta={"current": 1})
    try:
        agent_oid = ObjectId(agent_id)
        agent_config = agents_collection.find_one({"_id": agent_oid})
        if not agent_config:
            raise ValueError(f"Agent with ID {agent_id} not found.")
        input_data = json.dumps(payload)
    except Exception as e:
        logging.error(f"Error processing agent webhook: {e}", exc_info=True)
        return {"status": "error", "error": str(e)}

    self.update_state(state="PROGRESS", meta={"current": 50})
    try:
        result = run_agent_logic(agent_config, input_data)
    except Exception as e:
        logging.error(f"Error running agent logic: {e}", exc_info=True)
        return {"status": "error", "error": str(e)}
    finally:
        self.update_state(state="PROGRESS", meta={"current": 100})
        logging.info(
            f"Webhook processed for agent {agent_id}", extra={"agent_id": agent_id}
        )
        return {"status": "success", "result": result}