from dataclasses import dataclass
from decimal import Decimal
from pathlib import Path


DEFAULT_CONTEXT = (
    "Brazilian Portuguese conversation. Preserve Brazilian spelling and punctuation. "
    "Vocabulary may include AWS, Kubernetes, OpenAI, PostgreSQL, Brasília, Banco do Brasil."
)


@dataclass(frozen=True, slots=True)
class AppSettings:
    model: str
    language: str
    output_directory: Path
    chunk_duration_seconds: int = 900
    chunk_overlap_seconds: int = 15
    retain_temporary_files: bool = False
    context_vocabulary: str = DEFAULT_CONTEXT


@dataclass(frozen=True, slots=True)
class ToolStatus:
    ffmpeg_path: Path | None
    ffprobe_path: Path | None

    @property
    def available(self) -> bool:
        return self.ffmpeg_path is not None and self.ffprobe_path is not None


@dataclass(frozen=True, slots=True)
class MediaInfo:
    path: Path
    size_bytes: int
    duration_seconds: float | None
    audio_codec: str | None
    duration_text: str | None = None
    has_audio: bool = False
    has_video: bool = False


@dataclass(frozen=True, slots=True)
class ChunkBoundary:
    index: int
    start_seconds: Decimal
    end_seconds: Decimal

    @property
    def duration_seconds(self) -> Decimal:
        return self.end_seconds - self.start_seconds