import os
import json
from datetime import datetime
from typing import Any, Dict, List, Optional


def ensure_storage_dirs() -> None:
    os.makedirs("./data", exist_ok=True)


def write_jsonl(path: str, record: Dict[str, Any]) -> None:
    ensure_storage_dirs()
    with open(path, "a", encoding="utf-8") as f:
        f.write(json.dumps(record, default=_json_default) + "\n")


def read_jsonl(path: str) -> List[Dict[str, Any]]:
    records: List[Dict[str, Any]] = []
    if not os.path.exists(path):
        return 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_receipt(receipt: Dict[str, Any]) -> None:
    from app.config import Settings
    path = Settings().get("receipt_storage_path", "./data/receipts.jsonl")
    write_jsonl(path, receipt)


def load_receipt_by_id(receipt_id: str) -> Optional[Dict[str, Any]]:
    from app.config import Settings
    path = Settings().get("receipt_storage_path", "./data/receipts.jsonl")
    for record in read_jsonl(path):
        if record.get("receipt_id") == receipt_id:
            return record
    return None


def save_session_event(event: Dict[str, Any]) -> None:
    write_jsonl("./data/session_events.jsonl", event)


def save_job_event(event: Dict[str, Any]) -> None:
    write_jsonl("./data/job_events.jsonl", event)


def compact_old_sessions() -> None:
    # v1: no-op; v2 can rotate logs
    pass


def _json_default(obj: Any) -> Any:
    if isinstance(obj, datetime):
        return obj.isoformat()
    raise TypeError(f"Object of type {type(obj)} is not JSON serializable")