import json
from pathlib import Path

DEFAULT_INGEST_ROOT = "/mnt/data/shared/scans/processed"
SETTINGS_FILE = Path("/mnt/storage/document-processor/settings/ingest.json")


def _ensure_parent() -> None:
    SETTINGS_FILE.parent.mkdir(parents=True, exist_ok=True)


def get_default_ingest_root() -> str:
    try:
        if SETTINGS_FILE.exists():
            data = json.loads(SETTINGS_FILE.read_text())
            value = str(data.get("default_ingest_root") or "").strip()
            if value:
                return value
    except Exception:
        pass
    return DEFAULT_INGEST_ROOT


def set_default_ingest_root(path_str: str) -> str:
    value = str(path_str or "").strip()
    if not value:
        value = DEFAULT_INGEST_ROOT

    _ensure_parent()
    SETTINGS_FILE.write_text(json.dumps({"default_ingest_root": value}, indent=2))
    return value


def reset_default_ingest_root() -> str:
    _ensure_parent()
    SETTINGS_FILE.write_text(json.dumps({"default_ingest_root": DEFAULT_INGEST_ROOT}, indent=2))
    return DEFAULT_INGEST_ROOT


def browse_directory(path_str: str) -> dict:
    target = Path(path_str).expanduser().resolve()

    result = {
        "path": str(target),
        "exists": target.exists(),
        "is_dir": target.is_dir(),
        "parent": "",
        "entries": [],
        "error": "",
    }

    if not target.exists():
        result["error"] = "Directory does not exist."
        return result

    if not target.is_dir():
        result["error"] = "Path is not a directory."
        return result

    parent = target.parent
    if parent != target:
        result["parent"] = str(parent)

    try:
        children = sorted(
            list(target.iterdir()),
            key=lambda p: (not p.is_dir(), p.name.lower()),
        )
    except Exception as exc:
        result["error"] = f"Could not read directory: {exc}"
        return result

    entries = []
    for child in children[:300]:
        entries.append(
            {
                "name": child.name,
                "path": str(child),
                "is_dir": child.is_dir(),
            }
        )

    result["entries"] = entries
    return result