import json
import os
import logging
from datetime import datetime, timezone
from typing import Dict, Tuple, Optional, Any

from src.display.formatting import styled_error, styled_message, styled_warning
from src.envs import API
from src.submission.check_validity import (
    already_submitted_models,
    check_model_card,
    get_model_size,
    is_model_on_hub,
    check_safetensors_format,
)
from src.config import (
    API_TOKEN,
    QUEUE_REPO,
    EVAL_REQUESTS_PATH,
    ALLOWED_WEIGHT_TYPES,
    DEFAULT_REVISION,
    LOG_LEVEL,
    EVALUATION_WAIT_TIME
)

REQUESTED_MODELS: Optional[Dict[str, Any]] = None
USERS_TO_SUBMISSION_DATES: Optional[Dict[str, Any]] = None

logging.basicConfig(level=getattr(logging, LOG_LEVEL))
logger = logging.getLogger(__name__)

def validate_input(model_type: Optional[str], weight_type: str) -> Optional[str]:
    """Validate input parameters."""
    if model_type is None or model_type == "":
        return styled_error("Please select a model type.")
    if weight_type not in ALLOWED_WEIGHT_TYPES:
        return styled_error(f"Invalid weight type. Must be one of: {', '.join(ALLOWED_WEIGHT_TYPES)}")
    if weight_type != "Safetensors" and weight_type != "GGUF":
        return styled_error(
            "Only Safetensors format is accepted for new submissions (or GGUF for quantized models). Please convert your model using:\n"
            "```python\n"
            "from transformers import AutoModelForCausalLM\n"
            "from safetensors.torch import save_file\n\n"
            "model = AutoModelForCausalLM.from_pretrained('your-model')\n"
            "state_dict = model.state_dict()\n"
            "save_file(state_dict, 'model.safetensors')\n"
            "```"
        )
    return None

def check_model_existence(model: str, revision: str, token: str) -> Optional[str]:
    """Check if the model exists on the hub."""
    if revision == "":
        revision = DEFAULT_REVISION
    model_on_hub, error, _ = is_model_on_hub(model_name=model, revision=revision, token=token, test_tokenizer=True)
    if not model_on_hub:
        return styled_error(f'Model "{model}" {error}')
    return None

def get_model_information(model: str, revision: str, weight_type: str) -> Tuple[Optional[Any], Optional[str]]:
    """Get model information and perform necessary checks."""
    if weight_type != "GGUF":
        safetensors_ok, error_msg = check_safetensors_format(model, revision, API_TOKEN)
        if not safetensors_ok:
            return None, styled_error(error_msg)

    try:
        model_info = API.model_info(repo_id=model, revision=revision)
    except Exception as e:
        logger.error(f"Failed to get model info: {e}")
        return None, styled_error("Could not get your model information. Please fill it up properly.")

    try:
        license = model_info.cardData["license"]
    except Exception as e:
        logger.error(f"Failed to get license info: {e}")
        return None, styled_error("Please select a license for your model")

    modelcard_OK, error_msg = check_model_card(model)
    if not modelcard_OK:
        return None, styled_error(error_msg)

    return model_info, None

def create_eval_entry(model: str, base_model: str, revision: str, precision: str, weight_type: str, model_type: str, model_info: Any, model_size: float) -> Dict[str, Any]:
    """Create the evaluation entry dictionary."""
    current_time = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    return {
        "model": model,
        "base_model": base_model,
        "revision": revision,
        "precision": precision,
        "weight_type": weight_type,
        "status": "PENDING",
        "submitted_time": current_time,
        "model_type": model_type,
        "likes": model_info.likes,
        "params": model_size,
        "license": model_info.cardData["license"],
        "private": False,
    }

def add_new_eval(
    model: str,
    base_model: str,
    revision: str,
    precision: str,
    weight_type: str,
    model_type: str,
) -> str:
    """
    Add a new model evaluation request to the queue.

    Args:
        model (str): The name of the model to evaluate.
        base_model (str): The name of the base model (for delta or adapter weights).
        revision (str): The revision of the model to evaluate.
        precision (str): The precision of the model weights.
        weight_type (str): The format of the model weights.
        model_type (str): The type of the model.

    Returns:
        str: A message indicating the result of the evaluation request.
    """
    global REQUESTED_MODELS
    global USERS_TO_SUBMISSION_DATES
    global EVAL_REQUESTS_PATH

    # Check and modify EVAL_REQUESTS_PATH at the beginning
    if not EVAL_REQUESTS_PATH or EVAL_REQUESTS_PATH == "YOUR_EVAL_REQUESTS_PATH_HERE":
        return styled_error("EVAL_REQUESTS_PATH is not properly configured. Please check your configuration.")

    # Ensure EVAL_REQUESTS_PATH ends with 'eval-queue'
    if not EVAL_REQUESTS_PATH.endswith('eval-queue'):
        EVAL_REQUESTS_PATH = os.path.join(EVAL_REQUESTS_PATH, 'eval-queue')

    # Input validation
    if not all([model, revision, precision, weight_type, model_type]):
        return styled_error("All fields except base_model are required.")

    if not REQUESTED_MODELS:
        REQUESTED_MODELS, USERS_TO_SUBMISSION_DATES = already_submitted_models(EVAL_REQUESTS_PATH)

    user_name, model_path = model.split("/") if "/" in model else ("", model)
    precision = precision.split(" ")[0]

    error = validate_input(model_type, weight_type)
    if error:
        return error

    error = check_model_existence(model, revision, API_TOKEN)
    if error:
        return error

    model_info, error = get_model_information(model, revision, weight_type)
    if error:
        return error

    model_size = get_model_size(model_info=model_info, precision=precision)

    eval_entry = create_eval_entry(model, base_model, revision, precision, weight_type, model_type, model_info, model_size)

    # Check for duplicate submission
    if f"{model}_{revision}_{precision}" in REQUESTED_MODELS:
        return styled_warning("This model has been already submitted.")

    logger.info("Creating eval file")
    OUT_DIR = os.path.join(EVAL_REQUESTS_PATH, user_name)
    os.makedirs(OUT_DIR, exist_ok=True)
    out_path = os.path.join(OUT_DIR, f"{model_path}_eval_request_False_{precision}_{weight_type}.json")

    try:
        with open(out_path, "w") as f:
            json.dump(eval_entry, f)
    except IOError as e:
        logger.error(f"Failed to write eval file: {e}")
        return styled_error(f"Failed to create eval file: {e}")

    logger.info("Uploading eval file")
    try:
        # Get the relative path from EVAL_REQUESTS_PATH
        rel_path = os.path.relpath(out_path, EVAL_REQUESTS_PATH)
        
        API.upload_file(
            path_or_fileobj=out_path,
            path_in_repo=rel_path,
            repo_id=QUEUE_REPO,
            repo_type="dataset",
            commit_message=f"Add {model} to eval queue",
        )
    except Exception as e:
        logger.error(f"Failed to upload eval file: {e}")
        return styled_error(f"Failed to upload eval file: {e}")

    # Remove the local file
    try:
        os.remove(out_path)
    except OSError as e:
        logger.warning(f"Failed to remove local eval file: {e}")

    return styled_message(
        f"Your request has been submitted to the evaluation queue!\n"
        f"The model will be evaluated for:\n"
        f"1. Safetensors compliance\n"
        f"2. Security awareness using the stacklok/insecure-code dataset\n"
        f"Please wait for up to {EVALUATION_WAIT_TIME} minutes for the model to show in the PENDING list."
    )