import io
import json
import os
import shlex
import subprocess
import traceback
import threading
import uuid
import base64
from typing import Optional, Dict, Any

import requests
from fastapi import Request
from huggingface_hub import HfApi, hf_hub_download
from loguru import logger
from cryptography.hazmat.primitives.ciphers.aead import AESGCM

from competitions.enums import SubmissionStatus
from competitions.params import EvalParams

from . import HF_URL


USER_TOKEN = os.environ.get("USER_TOKEN")


def token_information(token):
    if token.startswith("hf_oauth"):
        _api_url = HF_URL + "/oauth/userinfo"
    else:
        _api_url = HF_URL + "/api/whoami-v2"
    headers = {}
    cookies = {}
    if token.startswith("hf_"):
        headers["Authorization"] = f"Bearer {token}"
    else:
        cookies = {"token": token}
    try:
        response = requests.get(
            _api_url,
            headers=headers,
            cookies=cookies,
            timeout=3,
        )
    except (requests.Timeout, ConnectionError) as err:
        logger.error(f"Failed to request whoami-v2 - {repr(err)}")
        raise Exception("Hugging Face Hub is unreachable, please try again later.")

    if response.status_code != 200:
        logger.error(f"Failed to request whoami-v2 - {response.status_code}")
        raise Exception("Invalid token.")

    resp = response.json()
    user_info = {}

    if token.startswith("hf_oauth"):
        user_info["id"] = resp["sub"]
        user_info["name"] = resp["preferred_username"]
        user_info["orgs"] = [resp["orgs"][k]["preferred_username"] for k in range(len(resp["orgs"]))]
    else:
        user_info["id"] = resp["id"]
        user_info["name"] = resp["name"]
        user_info["orgs"] = [resp["orgs"][k]["name"] for k in range(len(resp["orgs"]))]
    return user_info


def user_authentication(request: Request):
    auth_header = request.headers.get("Authorization")
    bearer_token = None

    if auth_header and auth_header.startswith("Bearer "):
        bearer_token = auth_header.split(" ")[1]

    if bearer_token:
        try:
            _ = token_information(token=bearer_token)
            return bearer_token
        except Exception as e:
            logger.error(f"Failed to verify token: {e}")
            return None

    if USER_TOKEN is not None:
        try:
            _ = token_information(token=USER_TOKEN)
            return USER_TOKEN
        except Exception as e:
            logger.error(f"Failed to verify token: {e}")
            return None

    if "oauth_info" in request.session:
        try:
            _ = token_information(token=request.session["oauth_info"]["access_token"])
            return request.session["oauth_info"]["access_token"]
        except Exception as e:
            request.session.pop("oauth_info", None)
            logger.error(f"Failed to verify token: {e}")
            return None

    return None


def user_authentication_dep(token, return_raw=False):
    if token.startswith("hf_oauth"):
        _api_url = HF_URL + "/oauth/userinfo"
    else:
        _api_url = HF_URL + "/api/whoami-v2"
    headers = {}
    cookies = {}
    if token.startswith("hf_"):
        headers["Authorization"] = f"Bearer {token}"
    else:
        cookies = {"token": token}
    try:
        response = requests.get(
            _api_url,
            headers=headers,
            cookies=cookies,
            timeout=3,
        )
    except (requests.Timeout, ConnectionError) as err:
        logger.error(f"Failed to request whoami-v2 - {repr(err)}")
        raise Exception("Hugging Face Hub is unreachable, please try again later.")

    resp = response.json()
    if return_raw:
        return resp

    user_info = {}
    if "error" in resp:
        return resp
    if token.startswith("hf_oauth"):
        user_info["id"] = resp["sub"]
        user_info["name"] = resp["preferred_username"]
        user_info["orgs"] = [resp["orgs"][k]["preferred_username"] for k in range(len(resp["orgs"]))]
    else:

        user_info["id"] = resp["id"]
        user_info["name"] = resp["name"]
        user_info["orgs"] = [resp["orgs"][k]["name"] for k in range(len(resp["orgs"]))]
    return user_info


def make_clickable_user(user_id):
    link = "https://huggingface.co/" + user_id
    return f'<a  target="_blank" href="{link}">{user_id}</a>'


def run_evaluation(params, local=False, wait=False):
    params = json.loads(params)
    if isinstance(params, str):
        params = json.loads(params)
    params = EvalParams(**params)
    if not local:
        params.output_path = "/tmp/model"
    params.save(output_dir=params.output_path)
    cmd = [
        "python",
        "-m",
        "competitions.evaluate",
        "--config",
        os.path.join(params.output_path, "params.json"),
    ]

    cmd = [str(c) for c in cmd]
    logger.info(cmd)
    env = os.environ.copy()
    cmd = shlex.split(" ".join(cmd))
    process = subprocess.Popen(cmd, env=env)
    if wait:
        process.wait()
    return process.pid


def pause_space(params):
    if "SPACE_ID" in os.environ:
        if os.environ["SPACE_ID"].split("/")[-1].startswith("comp-"):
            logger.info("Pausing space...")
            api = HfApi(token=params.token)
            api.pause_space(repo_id=os.environ["SPACE_ID"])


def delete_space(params):
    if "SPACE_ID" in os.environ:
        if os.environ["SPACE_ID"].split("/")[-1].startswith("comp-"):
            logger.info("Deleting space...")
            api = HfApi(token=params.token)
            api.delete_repo(repo_id=os.environ["SPACE_ID"], repo_type="space")


def download_submission_info(params):
    user_fname = hf_hub_download(
        repo_id=params.competition_id,
        filename=f"submission_info/{params.team_id}.json",
        token=params.token,
        repo_type="dataset",
    )
    with open(user_fname, "r", encoding="utf-8") as f:
        user_submission_info = json.load(f)

    return user_submission_info


def upload_submission_info(params, user_submission_info):
    user_submission_info_json = json.dumps(user_submission_info, indent=4)
    user_submission_info_json_bytes = user_submission_info_json.encode("utf-8")
    user_submission_info_json_buffer = io.BytesIO(user_submission_info_json_bytes)
    api = HfApi(token=params.token)
    api.upload_file(
        path_or_fileobj=user_submission_info_json_buffer,
        path_in_repo=f"submission_info/{params.team_id}.json",
        repo_id=params.competition_id,
        repo_type="dataset",
    )


def update_submission_status(params, status):
    user_submission_info = download_submission_info(params)
    for submission in user_submission_info["submissions"]:
        if submission["submission_id"] == params.submission_id:
            submission["status"] = status
            break
    upload_submission_info(params, user_submission_info)


def update_submission_score(params, public_score, private_score):
    user_submission_info = download_submission_info(params)
    for submission in user_submission_info["submissions"]:
        if submission["submission_id"] == params.submission_id:
            submission["public_score"] = public_score
            submission["private_score"] = private_score
            submission["status"] = "done"
            break
    upload_submission_info(params, user_submission_info)


def monitor(func):
    def wrapper(*args, **kwargs):
        params = kwargs.get("params", None)
        if params is None and len(args) > 0:
            params = args[0]

        try:
            return func(*args, **kwargs)
        except Exception as e:
            error_message = f"""{func.__name__} has failed due to an exception: {traceback.format_exc()}"""
            logger.error(error_message)
            logger.error(str(e))
            update_submission_status(params, SubmissionStatus.FAILED.value)
            pause_space(params)

    return wrapper


def uninstall_requirements(requirements_fname):
    if os.path.exists(requirements_fname):
        # read the requirements.txt
        uninstall_list = []
        with open(requirements_fname, "r", encoding="utf-8") as f:
            for line in f:
                if line.startswith("-"):
                    uninstall_list.append(line[1:])

        # create an uninstall.txt
        with open("uninstall.txt", "w", encoding="utf-8") as f:
            for line in uninstall_list:
                f.write(line)

        pipe = subprocess.Popen(
            [
                "pip",
                "uninstall",
                "-r",
                "uninstall.txt",
                "-y",
            ],
        )
        pipe.wait()
        logger.info("Requirements uninstalled.")
        return


def install_requirements(requirements_fname):
    # check if params.project_name has a requirements.txt
    if os.path.exists(requirements_fname):
        # install the requirements using subprocess, wait for it to finish
        install_list = []

        with open(requirements_fname, "r", encoding="utf-8") as f:
            for line in f:
                # if line startswith - then skip but dont skip if line startswith --
                if line.startswith("-"):
                    if not line.startswith("--"):
                        continue
                install_list.append(line)

        with open("install.txt", "w", encoding="utf-8") as f:
            for line in install_list:
                f.write(line)

        pipe = subprocess.Popen(
            [
                "pip",
                "install",
                "-r",
                "install.txt",
            ],
        )
        pipe.wait()
        logger.info("Requirements installed.")
        return
    logger.info("No requirements.txt found. Skipping requirements installation.")
    return


def is_user_admin(user_token, competition_organization):
    user_info = token_information(token=user_token)
    user_orgs = user_info.get("orgs", [])
    for org in user_orgs:
        if org == competition_organization:
            return True
    return False


class TeamAlreadyExistsError(Exception):
    """Custom exception for when a team already exists."""
    pass

class TeamFileApi:
    def __init__(self, hf_token: str, competition_id: str):
        self.hf_token = hf_token
        self.competition_id = competition_id
        self._lock = threading.Lock()

    def _get_team_info(self, user_id: str) -> Optional[Dict[str, Any]]:
        user_team = hf_hub_download(
            repo_id=self.competition_id,
            filename="user_team.json",
            token=self.hf_token,
            repo_type="dataset",
        )

        with open(user_team, "r", encoding="utf-8") as f:
            user_team = json.load(f)

        if user_id not in user_team:
            return None

        team_id = user_team[user_id]

        team_metadata = hf_hub_download(
            repo_id=self.competition_id,
            filename="teams.json",
            token=self.hf_token,
            repo_type="dataset",
        )

        with open(team_metadata, "r", encoding="utf-8") as f:
            team_metadata = json.load(f)

        return team_metadata[team_id]

    def _create_team(self, user_id: str, team_name: str, team_file: Optional[io.BytesIO]) -> str:
        with self._lock:
            user_team = hf_hub_download(
                repo_id=self.competition_id,
                filename="user_team.json",
                token=self.hf_token,
                repo_type="dataset",
            )
            with open(user_team, "r", encoding="utf-8") as f:
                user_team = json.load(f)

            team_metadata = hf_hub_download(
                repo_id=self.competition_id,
                filename="teams.json",
                token=self.hf_token,
                repo_type="dataset",
            )

            with open(team_metadata, "r", encoding="utf-8") as f:
                team_metadata = json.load(f)

            # create a new team, if user is not in any team
            team_id = str(uuid.uuid4())
            user_team[user_id] = team_id

            team_metadata[team_id] = {
                "id": team_id,
                "name": team_name,
                "members": [user_id],
                "leader": user_id,
            }

            user_team_json = json.dumps(user_team, indent=4)
            user_team_json_bytes = user_team_json.encode("utf-8")
            user_team_json_buffer = io.BytesIO(user_team_json_bytes)

            team_metadata_json = json.dumps(team_metadata, indent=4)
            team_metadata_json_bytes = team_metadata_json.encode("utf-8")
            team_metadata_json_buffer = io.BytesIO(team_metadata_json_bytes)

            api = HfApi(token=self.hf_token)
            api.upload_file(
                path_or_fileobj=user_team_json_buffer,
                path_in_repo="user_team.json",
                repo_id=self.competition_id,
                repo_type="dataset",
            )
            api.upload_file(
                path_or_fileobj=team_metadata_json_buffer,
                path_in_repo="teams.json",
                repo_id=self.competition_id,
                repo_type="dataset",
            )

            if team_file is not None:
                resp = api.upload_file(
                    path_or_fileobj=team_file,
                    path_in_repo=f"team_datas/{team_id}.xlsx",
                    repo_id=self.competition_id,
                    repo_type="dataset",
                )
        return team_id
    
    def create_team(self, user_token: str, team_name: str, team_file: io.BytesIO) -> str:
        user_info = token_information(token=user_token)
        return self._create_team(user_info["id"], team_name, team_file)

    def get_team_info(self, user_token: str) -> Optional[Dict[str, Any]]:
        user_info = token_information(token=user_token)
        return self._get_team_info(user_info["id"])

    def update_and_create_team_name(self, user_token, new_team_name):
        user_info = token_information(token=user_token)
        user_id = user_info["id"]
        team_info = self._get_team_info(user_id)
        if team_info is None:
            self._create_team(user_id, new_team_name)
            return new_team_name

        with self._lock:
            team_metadata = hf_hub_download(
                repo_id=self.competition_id,
                filename="teams.json",
                token=self.hf_token,
                repo_type="dataset",
            )
            with open(team_metadata, "r", encoding="utf-8") as f:
                team_metadata = json.load(f)

            team_metadata[team_info["id"]]["name"] = new_team_name
            team_metadata_json = json.dumps(team_metadata, indent=4)
            team_metadata_json_bytes = team_metadata_json.encode("utf-8")
            team_metadata_json_buffer = io.BytesIO(team_metadata_json_bytes)
            api = HfApi(token=self.hf_token)
            api.upload_file(
                path_or_fileobj=team_metadata_json_buffer,
                path_in_repo="teams.json",
                repo_id=self.competition_id,
                repo_type="dataset",
            )
        return new_team_name


team_file_api = TeamFileApi(
    os.environ.get("HF_TOKEN", None),
    os.environ.get("COMPETITION_ID"),
)


class UserTokenApi:
    def __init__(self, hf_token: str, key_base64: str, competition_id: str):
        self.hf_token = hf_token
        self.key = base64.b64decode(key_base64)
        self.competition_id = competition_id
    
    def _encrypt(self, text: str) -> str:
        aesgcm = AESGCM(self.key)
        nonce = os.urandom(12)
        encrypted_data = aesgcm.encrypt(nonce, text.encode(), None)
        return base64.b64encode(nonce + encrypted_data).decode()

    def _decrypt(self, encrypted_text: str) -> str:
        aesgcm = AESGCM(self.key)
        data = base64.b64decode(encrypted_text)
        nonce = data[:12]
        ciphertext = data[12:]
        plaintext = aesgcm.decrypt(nonce, ciphertext, None)
        return plaintext.decode()
    
    def put(self, team_id: str, user_token: str):
        encrypted_token = self._encrypt(user_token)
        api = HfApi(token=self.hf_token)
        api.upload_file(
            path_or_fileobj=io.BytesIO(encrypted_token.encode()),
            path_in_repo=f"team_user_tokens/{team_id}",
            repo_id=self.competition_id,
            repo_type="dataset",
        )

    def get(self, team_id: str) -> Optional[str]:
        try:
            user_token = hf_hub_download(
                repo_id=self.competition_id,
                filename=f"team_user_tokens/{team_id}",
                token=self.hf_token,
                repo_type="dataset",
            )
        except Exception as e:
            logger.error(f"Failed to download user token - {e}")
            return None

        with open(user_token, "r", encoding="utf-8") as f:
            encrypted_token = f.read()

        return self._decrypt(encrypted_token)


user_token_api = UserTokenApi(
    os.environ.get("HF_TOKEN", None),
    os.environ.get("USER_TOKEN_KEY_BASE64"),
    os.environ.get("COMPETITION_ID")
)