"""Small shared utilities."""

from __future__ import annotations

import hashlib
import json
from dataclasses import asdict, is_dataclass
from pathlib import Path
from typing import Any, Iterable


def document_id_for_path(path: str | Path) -> str:
    path_obj = Path(path)
    stat = path_obj.stat()
    seed = f"{path_obj.resolve()}:{stat.st_size}:{int(stat.st_mtime)}"
    return hashlib.sha1(seed.encode("utf-8")).hexdigest()[:16]


def file_type_from_path(path: str | Path) -> str:
    suffix = Path(path).suffix.lower().lstrip(".")
    if suffix == "pdf":
        return "pdf"
    if suffix in {"docx", "doc"}:
        return "docx"
    if suffix in {"pptx", "ppt"}:
        return "pptx"
    if suffix in {"xlsx", "xls", "csv"}:
        return "xlsx"
    if suffix in {"html", "htm"}:
        return "html"
    if suffix in {"png", "jpg", "jpeg", "tiff", "tif", "bmp", "webp"}:
        return "image"
    if suffix == "epub":
        return "epub"
    if suffix in {"md", "markdown"}:
        return "markdown"
    if suffix in {"txt", "text"}:
        return "text"
    return suffix or "unknown"


def to_plain_data(value: Any) -> Any:
    if is_dataclass(value):
        return {key: to_plain_data(item) for key, item in asdict(value).items()}
    if isinstance(value, dict):
        return {str(key): to_plain_data(item) for key, item in value.items()}
    if isinstance(value, (list, tuple)):
        return [to_plain_data(item) for item in value]
    if isinstance(value, Path):
        return str(value)
    return value


def dumps_json(value: Any, *, indent: int = 2) -> str:
    return json.dumps(to_plain_data(value), indent=indent, ensure_ascii=False, sort_keys=True)


def write_json(path: str | Path, value: Any) -> None:
    Path(path).write_text(dumps_json(value) + "\n", encoding="utf-8")


def write_jsonl(path: str | Path, records: Iterable[Any]) -> None:
    lines = [json.dumps(to_plain_data(record), ensure_ascii=False, sort_keys=True) for record in records]
    Path(path).write_text("\n".join(lines) + ("\n" if lines else ""), encoding="utf-8")


def normalize_whitespace(text: str) -> str:
    return " ".join(text.split())


def clamp(value: float, low: float = 0.0, high: float = 1.0) -> float:
    return max(low, min(high, value))