"""
View/Event Schema Definitions

Projections of domain models for UI consumption via SSE events.
These reference existing schema types (e.g., ChunkJobStatus) to maintain
type-level dependencies — if the domain model changes, views update too.
"""

from dataclasses import dataclass
from typing import Optional


@dataclass
class ChunkEvent:
    """SSE event for a single chunk's lifecycle."""

    sequence: int
    status: str
    size: Optional[int] = None
    worker_id: Optional[str] = None
    processing_time: Optional[float] = None
    error: Optional[str] = None
    retries: int = 0


@dataclass
class WorkerEvent:
    """SSE event for worker state changes."""

    worker_id: str
    state: str
    current_chunk: Optional[int] = None
    processed: int = 0
    errors: int = 0
    retries: int = 0


@dataclass
class PipelineStats:
    """Aggregate pipeline statistics, updated via SSE."""

    total_chunks: int = 0
    processed: int = 0
    failed: int = 0
    retries: int = 0
    elapsed: float = 0.0
    throughput_mbps: float = 0.0
    queue_size: int = 0


@dataclass
class ChunkOutputFile:
    """A chunk output file in S3/MinIO with presigned download URL."""

    key: str
    size: int = 0
    url: str = ""