from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path

from bedit_core.models import Document
from bedit_gui.services import document_files
from bedit_gui.services.application_logging import get_logger

logger = get_logger(__name__)


@dataclass(frozen=True)
class LoadedLibrary:
    path: Path
    document: Document


def list_library_files(library_paths: list[str]) -> list[Path]:
    files = []
    seen = set()
    for configured_path in library_paths:
        path = Path(configured_path).expanduser()
        candidates = [path] if path.is_file() else sorted(path.rglob("*"), key=lambda candidate: str(candidate).casefold()) if path.is_dir() else []
        for candidate in candidates:
            if not candidate.is_file() or candidate.suffix.lower() not in (".beb", ".json"):
                continue
            resolved = candidate.resolve()
            if resolved not in seen:
                seen.add(resolved)
                files.append(resolved)
    return files


def load_library_documents(library_paths: list[str]) -> list[LoadedLibrary]:
    libraries = []
    for path in list_library_files(library_paths):
        try:
            libraries.append(LoadedLibrary(path, document_files.load(path)))
        except (KeyError, OSError, TypeError, ValueError) as exc:
            logger.warning("Could not load library %s: %s", path, exc)
    return libraries