"""Read 1C configuration version from dump tree."""

from __future__ import annotations

import re
from pathlib import Path

_VERSION_TAG = re.compile(r"<Version>([^<]+)</Version>")
_NAME_TAG = re.compile(
    r"<Name>([^<]+)</Name>",
)


def config_root_from_src(src_root: Path) -> Path:
    """src/ → configuration root (parent that usually has VERSION + Configuration.xml)."""
    src_root = Path(src_root).resolve()
    if src_root.name == "src":
        return src_root.parent
    return src_root


def read_config_version(src_root: Path) -> str:
    """
    Resolve configuration version.

    Priority:
    1. <config_root>/VERSION
    2. <config_root>/src/Configuration.xml → <Version>
    3. <src_root>/Configuration.xml → <Version>
    """
    src_root = Path(src_root)
    root = config_root_from_src(src_root)
    version_file = root / "VERSION"
    if version_file.is_file():
        text = version_file.read_text(encoding="utf-8-sig", errors="ignore").strip()
        if text:
            return text.splitlines()[0].strip()

    for xml_path in (
        root / "src" / "Configuration.xml",
        src_root / "Configuration.xml",
        root / "Configuration.xml",
    ):
        if not xml_path.is_file():
            continue
        raw = xml_path.read_text(encoding="utf-8-sig", errors="ignore")
        m = _VERSION_TAG.search(raw)
        if m:
            return m.group(1).strip()

    return "unknown"


def read_config_name(src_root: Path) -> str | None:
    src_root = Path(src_root)
    root = config_root_from_src(src_root)
    xml_path = root / "src" / "Configuration.xml"
    if not xml_path.is_file():
        xml_path = src_root / "Configuration.xml"
    if not xml_path.is_file():
        return None
    raw = xml_path.read_text(encoding="utf-8-sig", errors="ignore")
    m = _NAME_TAG.search(raw)
    return m.group(1).strip() if m else None