"""
StepProbe: Shared utilities.
"""

import json
import os
import re
import random
import hashlib
from typing import List, Dict, Any, Optional

import numpy as np


def set_seed(seed: int = 42):
    """Set random seed for reproducibility."""
    random.seed(seed)
    np.random.seed(seed)
    try:
        import torch
        torch.manual_seed(seed)
        torch.cuda.manual_seed_all(seed)
    except ImportError:
        pass


def load_jsonl(path: str) -> List[dict]:
    """Load a JSONL file."""
    records = []
    with open(path, "r", encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if line:
                records.append(json.loads(line))
    return records


def save_jsonl(records: List[dict], path: str):
    """Save records to a JSONL file."""
    os.makedirs(os.path.dirname(path) or ".", exist_ok=True)
    with open(path, "w", encoding="utf-8") as f:
        for r in records:
            f.write(json.dumps(r, ensure_ascii=False) + "\n")


def load_json(path: str) -> dict:
    with open(path, "r", encoding="utf-8") as f:
        return json.load(f)


def save_json(data: dict, path: str):
    os.makedirs(os.path.dirname(path) or ".", exist_ok=True)
    with open(path, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)


def extract_number(text: str) -> Optional[str]:
    """Extract the final numeric answer from text."""
    # Try boxed format
    m = re.search(r"\\boxed\{([^}]+)\}", text)
    if m:
        return m.group(1).strip()
    # Try "answer is X"
    m = re.search(r"(?:the\s+)?(?:final\s+)?answer\s+is[:\s]+([^\n.]+)", text, re.IGNORECASE)
    if m:
        return m.group(1).strip()
    # Last number
    nums = re.findall(r"-?\d+(?:,\d{3})*(?:\.\d+)?", text)
    if nums:
        return nums[-1].replace(",", "")
    return None


def normalize_answer(ans: str) -> str:
    """Normalize an answer string for comparison."""
    if ans is None:
        return ""
    ans = str(ans).strip()
    # Remove LaTeX wrappers
    ans = re.sub(r"\\text\{([^}]*)\}", r"\1", ans)
    ans = re.sub(r"\$", "", ans)
    ans = re.sub(r"\\%", "%", ans)
    # Remove commas in numbers
    ans = re.sub(r"(\d),(\d)", r"\1\2", ans)
    # Trim trailing zeros after decimal
    if "." in ans:
        ans = ans.rstrip("0").rstrip(".")
    return ans.lower().strip()


def check_answer(predicted: str, gold: str) -> bool:
    """Check if a predicted answer matches the gold answer."""
    pred_norm = normalize_answer(predicted)
    gold_norm = normalize_answer(gold)
    if not pred_norm or not gold_norm:
        return False
    # Direct match
    if pred_norm == gold_norm:
        return True
    # Numeric match
    try:
        return abs(float(pred_norm) - float(gold_norm)) < 1e-6
    except (ValueError, TypeError):
        pass
    # Check if gold is contained
    if gold_norm in pred_norm:
        return True
    return False


def extract_gsm8k_answer(answer_text: str) -> str:
    """Extract numeric answer from GSM8K format '#### 42'."""
    m = re.search(r"####\s*(.*)", answer_text)
    if m:
        return m.group(1).strip()
    return extract_number(answer_text) or ""


def get_gpu_memory_gb() -> float:
    """Get current GPU memory usage in GB."""
    try:
        import torch
        if torch.cuda.is_available():
            return torch.cuda.max_memory_allocated() / 1e9
    except ImportError:
        pass
    return 0.0


def hash_text(text: str) -> str:
    """Create a short hash of text for dedup."""
    return hashlib.md5(text.encode()).hexdigest()[:12]


def truncate_text(text: str, max_chars: int = 500) -> str:
    """Truncate text for display."""
    if len(text) <= max_chars:
        return text
    return text[:max_chars] + "..."


def print_table(headers: List[str], rows: List[List[str]], col_widths: Optional[List[int]] = None):
    """Print a formatted text table."""
    if col_widths is None:
        col_widths = []
        for i, h in enumerate(headers):
            w = len(h)
            for row in rows:
                if i < len(row):
                    w = max(w, len(str(row[i])))
            col_widths.append(w + 2)

    fmt = "".join(f"{{:<{w}}}" for w in col_widths)
    print(fmt.format(*headers))
    print("-" * sum(col_widths))
    for row in rows:
        padded = [str(row[i]) if i < len(row) else "" for i in range(len(headers))]
        print(fmt.format(*padded))