from fastapi import APIRouter
from datetime import datetime
from datasets import load_dataset
from sklearn.metrics import accuracy_score
import numpy as np
import random
import torch
from transformers import AutoConfig, AutoModelForSequenceClassification, AutoTokenizer

from .utils.evaluation import TextEvaluationRequest
from .utils.emissions import tracker, clean_emissions_data, get_space_info

router = APIRouter()

DESCRIPTION = "bert base finetuned"
ROUTE = "/text"


def baseline_model(dataset_length: int):
    # Make random predictions (placeholder for actual model inference)
    #predictions = [random.randint(0, 7) for _ in range(dataset_length)]

    # My favorate baseline is the most common class.
    predictions = [0] * dataset_length

    return predictions


def bert_model(test_dataset):
    print('Starting my code block.')
    texts = test_dataset["quote"]

    model_repo = 'Nonnormalizable/frugal-ai-text-bert-base'
    config = AutoConfig.from_pretrained(model_repo)
    model = AutoModelForSequenceClassification.from_pretrained(model_repo)
    tokenizer = AutoTokenizer.from_pretrained(model_repo)

    if torch.cuda.is_available():
        device = torch.device('cuda')
    else:
        device = torch.device('cpu')
    print('device:', device)
    model = model.to(device)
    test_encoding = tokenizer(
        texts,
        truncation=True,
        padding=True,
        return_tensors='pt',
        )

    model.eval()
    with torch.no_grad():
        test_input_ids = test_encoding['input_ids'].to(device)
        test_attention_mask = test_encoding['attention_mask'].to(device)
        print('Starting model run.')
        outputs = model(test_input_ids, test_attention_mask)
        print('End of model run.')
        predictions = torch.argmax(outputs.logits, dim=1)
        predictions = predictions.cpu().numpy()
        
    print('End of my code block.')
    return predictions


@router.post(ROUTE, tags=["Text Task"], 
             description=DESCRIPTION)
async def evaluate_text(request: TextEvaluationRequest):
    """
    Evaluate text classification for climate disinformation detection.
    
    Current Model: Random Baseline
    - Makes random predictions from the label space (0-7)
    - Used as a baseline for comparison
    """
    # Get space info
    username, space_url = get_space_info()

    # Define the label mapping
    LABEL_MAPPING = {
        "0_not_relevant": 0,
        "1_not_happening": 1,
        "2_not_human": 2,
        "3_not_bad": 3,
        "4_solutions_harmful_unnecessary": 4,
        "5_science_unreliable": 5,
        "6_proponents_biased": 6,
        "7_fossil_fuels_needed": 7
    }

    # Load and prepare the dataset
    dataset = load_dataset(request.dataset_name)

    # Convert string labels to integers
    dataset = dataset.map(lambda x: {"label": LABEL_MAPPING[x["label"]]})

    # Split dataset
    train_test = dataset["train"].train_test_split(test_size=request.test_size, seed=request.test_seed)
    test_dataset = train_test["test"]
    
    # Start tracking emissions
    tracker.start()
    tracker.start_task("inference")

    #--------------------------------------------------------------------------------------------
    # YOUR MODEL INFERENCE CODE HERE
    # Update the code below to replace the random baseline by your model inference within the inference pass where the energy consumption and emissions are tracked.
    #--------------------------------------------------------------------------------------------   

    true_labels = test_dataset["label"]
    #predictions = baseline_model(len(true_labels))
    predictions = bert_model(test_dataset)

    #--------------------------------------------------------------------------------------------
    # YOUR MODEL INFERENCE STOPS HERE
    #--------------------------------------------------------------------------------------------   

    
    # Stop tracking emissions
    emissions_data = tracker.stop_task()
    
    # Calculate accuracy
    accuracy = accuracy_score(true_labels, predictions)
    
    # Prepare results dictionary
    results = {
        "username": username,
        "space_url": space_url,
        "submission_timestamp": datetime.now().isoformat(),
        "model_description": DESCRIPTION,
        "accuracy": float(accuracy),
        "energy_consumed_wh": emissions_data.energy_consumed * 1000,
        "emissions_gco2eq": emissions_data.emissions * 1000,
        "emissions_data": clean_emissions_data(emissions_data),
        "api_route": ROUTE,
        "dataset_config": {
            "dataset_name": request.dataset_name,
            "test_size": request.test_size,
            "test_seed": request.test_seed
        }
    }
    
    return results