"""
Dev tool, not part of the deployed app: renders dev/calibration.png through
the exact same zoom logic as _art_widget in subwave_nowplaying.star, so you
can visually check how much margin gets cropped at rest and at full zoom,
and whether the crop is even on all sides.

calibration.png is a 360x360 grid: concentric 10%-wide color rings (magenta
outermost, then yellow, then cyan) plus four corner markers (red TL, green
TR, blue BL, white BR) and a center crosshair.

Usage:
    pixlet render dev/calibration_test.star -o calib.gif
    pixlet render dev/calibration_test.star zoom_scale=1.0 -o calib_rest.gif  # rest only
    pixlet render dev/calibration_test.star ox=0.3 oy=0.3 -o calib_offcenter.gif

Keep ART_SIZE/ART_SLOT/the zoom math below in sync with the real
_art_widget if that ever changes.

History, if this ever needs revisiting: a Scale+Translate centered zoom
was tried first and produced a periodic rendering "pop", root-caused to
pixlet's own source (render/animation/translate.go): Translate's x/y are
rounded to the nearest whole pixel every frame by default, while Scale
never rounds, so a continuously-interpolating Scale combined with a
rounded Translate holds still for several frames then jumps a whole pixel
at once. `rounding = "none"` fixed that. But the Translate's *magnitude*
was also wrong: it assumed Scale pivots at the top-left corner by
default, when pixlet's docs say the default `origin` is already the
center (0.5, 0.5) -- so the "centering" Translate was overcorrecting,
visibly skewing the zoom toward the bottom-right instead. Replaced with
`origin` directly (which does, correctly, what that Translate was
clumsily approximating), confirmed via this calibration tool with
genuinely different (non-default) origin values -- they do change the
output, despite an earlier, flawed test (origin set to its own default
and compared against itself) suggesting `origin` had no effect at all.
"""

load("render.star", "render")
load("animation.star", "animation")
load("calibration.png", CALIB = "file")

ART_SIZE = 36
ART_SLOT = 32
ART_ZOOM_DURATION = 200

def _art_widget(art_bytes, zoom_scale, origin_x, origin_y):
    art = render.Image(src = art_bytes, width = ART_SIZE, height = ART_SIZE)
    top_scale = max(zoom_scale, 1.0)
    zoom = animation.Transformation(
        child = art,
        duration = ART_ZOOM_DURATION,
        origin = animation.Origin(origin_x, origin_y),
        keyframes = [
            animation.Keyframe(percentage = 0.0, transforms = [animation.Scale(1.0, 1.0)]),
            animation.Keyframe(percentage = 0.5, transforms = [animation.Scale(top_scale, top_scale)], curve = "ease_in_out"),
            animation.Keyframe(percentage = 1.0, transforms = [animation.Scale(1.0, 1.0)], curve = "ease_in_out"),
        ],
    )
    return render.Box(width = ART_SLOT, height = ART_SLOT, child = zoom)

def main(config):
    zoom_scale = float(config.get("zoom_scale", "1.4"))
    origin_x = float(config.get("ox", "0.5"))
    origin_y = float(config.get("oy", "0.5"))
    return render.Root(child = render.Row(children = [
        _art_widget(CALIB.readall(), zoom_scale, origin_x, origin_y),
        render.Box(width = 32, height = 32, color = "#111111"),
    ]))