"""Rainbow animation — full HSV hue cycle across the strip."""
import colorsys
from lightsync.animations.base import AnimationBase


class RainbowAnimation(AnimationBase):
    """Hue-shifting rainbow across the entire strip.

    period=1.0 means one full rainbow cycle fits on the strip.
    speed controls how fast the hues shift over time.
    """

    def __init__(
        self,
        speed: float = 0.5,
        period: float = 1.0,
    ) -> None:
        self.speed = speed
        self.period = period

    def render(self, t: float, led_count: int) -> list[tuple]:
        pixels = []
        for i in range(led_count):
            hue = (i / led_count / self.period + t * self.speed) % 1.0
            r_f, g_f, b_f = colorsys.hsv_to_rgb(hue, 1.0, 1.0)
            pixels.append((
                int(r_f * 255),
                int(g_f * 255),
                int(b_f * 255),
            ))
        return pixels

    @classmethod
    def from_params(cls, params: dict) -> "RainbowAnimation":
        return cls(
            speed=params.get("speed", 0.5),
            period=params.get("period", 1.0),
        )