"""Depozitul de documente pentru indexarea RAG a lui Maria.

Fisiere text (.txt/.md) sub STATE_DIR/documents/, un singur nivel (fara
subdirectoare), ca numele afisat in dashboard sa fie neambiguu si sa poata servi
direct ca parametru de request fara riscuri de traversare de cale.
"""

from __future__ import annotations

import re

import config

_SAFE_NAME = re.compile(r"^[A-Za-z0-9._-]{1,200}$")


def validate_name(name: str) -> str:
    if not name or not _SAFE_NAME.match(name) or ".." in name or "/" in name:
        raise ValueError(f"nume de document invalid: {name!r}")
    if not name.endswith((".txt", ".md")):
        raise ValueError("doar fisiere .txt sau .md")
    return name


def list_documents() -> list[dict]:
    config.DOCS_DIR.mkdir(parents=True, exist_ok=True)
    out = []
    for f in sorted(config.DOCS_DIR.glob("*")):
        if not f.is_file() or f.suffix not in (".txt", ".md"):
            continue
        st = f.stat()
        out.append({"name": f.name, "size": st.st_size, "mtime": st.st_mtime})
    return out


def read_document(name: str) -> str:
    name = validate_name(name)
    return (config.DOCS_DIR / name).read_text(encoding="utf-8")


def write_document(name: str, content: str) -> None:
    name = validate_name(name)
    config.DOCS_DIR.mkdir(parents=True, exist_ok=True)
    (config.DOCS_DIR / name).write_text(content, encoding="utf-8")


def delete_document(name: str) -> bool:
    name = validate_name(name)
    path = config.DOCS_DIR / name
    if not path.exists():
        return False
    path.unlink()
    return True