# chuk-motion/src/chuk_motion/components/overlays/LowerThird/builder.py
"""LowerThird composition builder method."""
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from ....generator.composition_builder import CompositionBuilder
def add_to_composition(
builder: "CompositionBuilder",
name: str,
start_time: float,
title: str | None = None,
variant: str | None = None,
position: str | None = None,
duration: float = 5.0,
) -> "CompositionBuilder":
"""
Add LowerThird to the composition.
Returns:
CompositionBuilder instance for chaining
"""
from ....generator.composition_builder import ComponentInstance
# Calculate frames if time-based props exist
start_frame = builder.seconds_to_frames(locals().get("start_time", 0.0))
duration_frames = builder.seconds_to_frames(
locals().get("duration_seconds") or locals().get("duration", 3.0)
)
component = ComponentInstance(
component_type="LowerThird",
start_frame=start_frame,
duration_frames=duration_frames,
props={
"name": name,
"title": title,
"variant": variant,
"position": position,
"start_time": start_time,
"duration": duration,
},
layer=10,
)
builder.components.append(component)
return builder