from dataclasses import dataclass
from enum import Enum
from typing import Tuple

from serato_doctor.models.track import DiskTrack


class DuplicateKind(str, Enum):
    EXACT_NAME = "exact_name"
    CLOUD_CONFLICT = "cloud_conflict"


@dataclass(frozen=True)
class DuplicateGroup:
    """A deterministic group of files that warrants duplicate review."""

    kind: DuplicateKind
    comparison_key: str
    tracks: Tuple[DiskTrack, ...]

    @property
    def extra_files(self) -> int:
        return max(0, len(self.tracks) - 1)

    @property
    def display_name(self) -> str:
        return min(
            (track.filename for track in self.tracks),
            key=lambda name: (len(name), name.casefold()),
        )