"""
AIFinder Dataset Evaluator with Server
Runs the Flask server, then allows interactive dataset input.
"""

import os
import sys
import time
import argparse
import random
import threading
import requests
from collections import defaultdict

from datasets import load_dataset
from tqdm import tqdm

from config import MODEL_DIR
from inference import AIFinder


HF_TOKEN = os.environ.get("HF_TOKEN")
SERVER_URL = "http://localhost:7860"


def start_server():
    """Start Flask server in background thread."""
    os.chdir(os.path.dirname(os.path.abspath(__file__)))
    from app import app, load_models

    load_models()
    print("Server started on http://localhost:7860")
    app.run(host="0.0.0.0", port=7860, debug=False, use_reloader=False)


def wait_for_server(timeout=30):
    """Wait for server to be ready."""
    start = time.time()
    while time.time() - start < timeout:
        try:
            resp = requests.get(f"{SERVER_URL}/api/status", timeout=2)
            if resp.status_code == 200:
                return True
        except requests.exceptions.RequestException:
            pass
        time.sleep(1)
    return False


def _parse_msg(msg):
    """Parse a message that may be a dict or a JSON string."""
    if isinstance(msg, dict):
        return msg
    if isinstance(msg, str):
        try:
            import json

            parsed = json.loads(msg)
            if isinstance(parsed, dict):
                return parsed
        except (ValueError, Exception):
            pass
    return {}


def _extract_response_only(content):
    """Extract only the final response, stripping CoT blocks."""
    import re

    if not content:
        return ""
    think_match = re.search(r"</?think(?:ing)?>(.*)$", content, re.DOTALL)
    if think_match:
        response = think_match.group(1).strip()
        if response:
            return response
    return content


def extract_texts_from_dataset(dataset_id, max_samples=None):
    """Extract assistant response texts from a HuggingFace dataset."""
    print(f"\nLoading dataset: {dataset_id}")

    load_kwargs = {"token": HF_TOKEN} if HF_TOKEN else {}
    rows = []

    try:
        ds = load_dataset(dataset_id, split="train", **load_kwargs)
        rows = list(ds)
    except Exception as e:
        print(f"Failed to load dataset: {e}")
        try:
            import pandas as pd

            url = f"https://huggingface.co/api/datasets/{dataset_id}/parquet/default/train/0.parquet"
            df = pd.read_parquet(url)
            rows = df.to_dict(orient="records")
        except Exception as e2:
            print(f"Parquet fallback also failed: {e2}")
            return []

    texts = []
    for row in rows:
        convos = row.get("conversations") or row.get("messages") or []

        if not convos:
            continue

        for msg in convos:
            msg = _parse_msg(msg)
            role = msg.get("role", "")
            content = msg.get("content", "")

            if role in ("assistant", "gpt", "model") and content:
                response_only = _extract_response_only(content)
                if response_only and len(response_only) > 50:
                    texts.append(response_only)

    if max_samples and len(texts) > max_samples:
        random.seed(42)
        texts = random.sample(texts, max_samples)

    return texts


def evaluate_dataset(texts):
    """Evaluate all texts via API and aggregate results."""
    results = {
        "total": len(texts),
        "provider_counts": defaultdict(int),
        "confidences": defaultdict(list),
    }

    for text in tqdm(texts, desc="Evaluating"):
        try:
            resp = requests.post(
                f"{SERVER_URL}/api/classify",
                json={"text": text, "top_n": 5},
                timeout=30,
            )
            if resp.status_code == 200:
                result = resp.json()
                pred_provider = result.get("provider")
                confidence = result.get("confidence", 0) / 100.0

                if pred_provider:
                    results["provider_counts"][pred_provider] += 1
                    results["confidences"][pred_provider].append(confidence)
        except Exception as e:
            print(f"Error: {e}")
            continue

    return results


def print_results(results):
    """Print aggregated evaluation results."""
    total = results["total"]
    print("\n" + "=" * 60)
    print(f"EVALUATION RESULTS ({total} samples)")
    print("=" * 60)

    print("\n--- Predicted Provider Distribution ---")
    for provider, count in sorted(
        results["provider_counts"].items(), key=lambda x: -x[1]
    ):
        pct = (count / total) * 100
        avg_conf = sum(results["confidences"][provider]) / len(
            results["confidences"][provider]
        )
        print(
            f"  {provider}: {count} ({pct:.1f}%) - Avg confidence: {avg_conf * 100:.1f}%"
        )

    if results["confidences"]:
        print("\n--- Top Providers (by cumulative confidence) ---")
        provider_scores = {}
        for provider, confs in results["confidences"].items():
            if confs:
                avg_conf = sum(confs) / len(confs)
                count = results["provider_counts"][provider]
                provider_scores[provider] = avg_conf * count

        for provider, score in sorted(provider_scores.items(), key=lambda x: -x[1])[:3]:
            print(f"  {provider}: {score:.2f}")

    print("\n" + "=" * 60)


def main():
    parser = argparse.ArgumentParser(
        description="AIFinder Dataset Evaluator with Server"
    )
    parser.add_argument(
        "--max-samples", type=int, default=None, help="Max samples to test"
    )
    args = parser.parse_args()

    print("Starting AIFinder server...")
    server_thread = threading.Thread(target=start_server, daemon=True)
    server_thread.start()

    print("Waiting for server...")
    if not wait_for_server():
        print("Server failed to start!")
        sys.exit(1)

    print("\n" + "=" * 60)
    print("AIFinder Server Ready!")
    print("=" * 60)
    print(f"Server running at: {SERVER_URL}")
    print("Enter a HuggingFace dataset ID to evaluate.")
    print("Examples: ianncity/Hunter-Alpha-SFT-300000x")
    print("Type 'quit' or 'exit' to stop.")
    print("=" * 60 + "\n")

    while True:
        try:
            dataset_id = input("Dataset ID: ").strip()

            if dataset_id.lower() in ("quit", "exit", "q"):
                print("Goodbye!")
                break

            if not dataset_id:
                continue

            texts = extract_texts_from_dataset(dataset_id, args.max_samples)

            if not texts:
                print("No valid texts found in dataset.")
                continue

            print(f"Testing {len(texts)} responses...")
            results = evaluate_dataset(texts)
            print_results(results)

        except KeyboardInterrupt:
            print("\nGoodbye!")
            break
        except Exception as e:
            print(f"Error: {e}")


if __name__ == "__main__":
    main()