import json
from pathlib import Path
from typing import Any, Dict, Iterable, Optional

import pandas as pd

from .contracts import default_run_id


def make_run_dir(run_id: Optional[str] = None, base_dir: str = "runs") -> Path:
    rid = run_id or default_run_id("run")
    out = Path(base_dir) / rid
    out.mkdir(parents=True, exist_ok=True)
    return out


def write_json(path: Path, data: Any) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(data, indent=2), encoding="utf-8")
    return path


def write_markdown(path: Path, text: str) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(text or "", encoding="utf-8")
    return path


def append_jsonl(path: Path, row: Dict[str, Any]) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("a", encoding="utf-8") as f:
        f.write(json.dumps(row, ensure_ascii=True) + "\n")
    return path


def write_jsonl(path: Path, rows: Iterable[Dict[str, Any]]) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w", encoding="utf-8") as f:
        for row in rows:
            f.write(json.dumps(row, ensure_ascii=True) + "\n")
    return path


def write_dataframe_csv(path: Path, df: pd.DataFrame) -> Path:
    path.parent.mkdir(parents=True, exist_ok=True)
    df.to_csv(path, index=False)
    return path


def load_json(path: Path) -> Any:
    return json.loads(path.read_text(encoding="utf-8"))