# Copyright (C) 2025 AIDC-AI
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#     http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Progress event models for video generation

Provides structured progress events for UI layer to consume and translate.
"""

from dataclasses import dataclass
from typing import Optional


@dataclass
class ProgressEvent:
    """
    Structured progress event for video generation
    
    Attributes:
        event_type: Type of event (e.g., "generating_narrations", "frame_step", "concatenating")
        progress: Progress value from 0.0 to 1.0
        frame_current: Current frame number (1-based, optional)
        frame_total: Total number of frames (optional)
        step: Current step within frame (1-4, optional)
        action: Action being performed (e.g., "audio", "image", "compose", "video", optional)
    
    Examples:
        # Simple progress event
        ProgressEvent(event_type="generating_narrations", progress=0.05)
        
        # Frame step event
        ProgressEvent(
            event_type="frame_step",
            progress=0.23,
            frame_current=1,
            frame_total=5,
            step=1,
            action="audio"
        )
    """
    event_type: str
    progress: float
    
    # Optional frame-related fields
    frame_current: Optional[int] = None
    frame_total: Optional[int] = None
    step: Optional[int] = None  # 1-4 for frame processing steps
    action: Optional[str] = None  # "audio", "image", "compose", "video"
    extra_info: Optional[str] = None  # Additional information (e.g., batch progress)
    
    def __post_init__(self):
        """Validate progress value"""
        if not 0.0 <= self.progress <= 1.0:
            raise ValueError(f"Progress must be between 0.0 and 1.0, got {self.progress}")