"""
Media source models.

Describes what types of sources the detection pipeline can process.
Only chunk_job (blobs in MinIO) is implemented now — the rest are
extension points with defined shapes.
"""

from dataclasses import dataclass, field
from enum import Enum


class SourceType(str, Enum):
    CHUNK_JOB = "chunk_job"   # pre-chunked video segments in blob storage
    UPLOAD    = "upload"      # future: user-uploaded file → MinIO → pipeline
    DEVICE    = "device"      # future: local camera/capture card via ffmpeg (no MinIO)
    STREAM    = "stream"      # future: RTMP/HLS URL via ffmpeg (no MinIO)


@dataclass
class ChunkInfo:
    """A single chunk (video segment) stored in blob storage."""
    filename: str
    key: str          # storage key (MinIO object key)
    size_bytes: int


@dataclass
class SourceJob:
    """
    A group of chunks that belong together (same source video/session).

    Listed by the source selector so the user can pick a job,
    then drill into its chunks.
    """
    job_id: str
    source_type: str          # SourceType value
    chunk_count: int
    total_bytes: int = 0