"""Strobe animation — rapid on/off flashing."""
from lightsync.animations.base import AnimationBase


class StrobeAnimation(AnimationBase):
    """Rapid on/off flashing at configurable frequency and duty cycle.

    speed=0.5 -> ~10.5 Hz. duty_cycle=0.1 means 10% on, 90% off.
    """

    def __init__(
        self,
        color: tuple[int, int, int] = (255, 255, 255),
        speed: float = 0.5,
        duty_cycle: float = 0.1,
        white: int = 0,
    ) -> None:
        self.color = tuple(color)  # type: ignore[arg-type]
        self.speed = speed
        self.duty_cycle = duty_cycle
        self.white = white

    def render(self, t: float, led_count: int) -> list[tuple]:
        # Frequency: 1-20 Hz mapped from speed 0.0-1.0
        freq = 1.0 + self.speed * 19.0
        phase = (t * freq) % 1.0

        if phase < self.duty_cycle:
            pixel = self.color
        else:
            pixel = (0, 0, 0)

        return [pixel] * led_count

    @classmethod
    def from_params(cls, params: dict) -> "StrobeAnimation":
        return cls(
            color=tuple(params.get("color", [255, 255, 255])),  # type: ignore[arg-type]
            speed=params.get("speed", 0.5),
            duty_cycle=params.get("duty_cycle", 0.1),
            white=params.get("white", 0),
        )