"""
Code Receipts — PATCH_RECEIPT_V1 ledger

Every generated patch gets an immutable receipt with:
- frame hashes that informed it
- audio chunk hashes
- speaker segments
- retrieval docs
- reason codes
- uncertainty
"""

import json
import os
import time
from pathlib import Path
from typing import Optional


RECEIPT_DIR = Path(os.getenv("RECEIPT_DIR", "/data/receipts" if Path("/data").exists() else "data/receipts"))
RECEIPT_DIR.mkdir(parents=True, exist_ok=True)


def save_receipt(receipt: dict) -> str:
    """Save receipt to disk. Returns the file path."""
    receipt_id = receipt.get("patch_hash", str(int(time.time() * 1000)))
    path = RECEIPT_DIR / f"{receipt_id}.json"
    path.write_text(json.dumps(receipt, indent=2, default=str))
    return str(path)


def list_receipts(limit: int = 50) -> list:
    """List recent receipts."""
    files = sorted(RECEIPT_DIR.glob("*.json"), key=lambda f: f.stat().st_mtime, reverse=True)
    receipts = []
    for f in files[:limit]:
        receipts.append(json.loads(f.read_text()))
    return receipts


def get_receipt(receipt_id: str) -> Optional[dict]:
    path = RECEIPT_DIR / f"{receipt_id}.json"
    if not path.exists():
        return None
    return json.loads(path.read_text())