from dataclasses import dataclass
from pathlib import Path
from typing import Iterable, Optional, Tuple


@dataclass(frozen=True)
class ScanConfig:
    """Read-only paths used for one library scan."""

    serato: Path
    music: Path
    out: Path
    report: Path
    reference_roots: Tuple[Path, ...] = ()
    verbose: bool = False
    log_file: Optional[Path] = None

    @classmethod
    def build(
        cls,
        serato: Path,
        music: Path,
        out: Path,
        report: Path,
        reference_roots: Iterable[Path] = (),
        verbose: bool = False,
        log_file: Optional[Path] = None,
    ) -> "ScanConfig":
        return cls(
            serato,
            music,
            out,
            report,
            tuple(reference_roots),
            verbose,
            log_file,
        )