from dataclasses import dataclass
import cadquery as Cq
from nhf import Material, Role
from nhf.build import Model, target, assembly, TargetKind
import nhf.utils

@dataclass
class LightPanel(Model):

    # Dimensions of the base panel
    length: float = 300.0
    width: float = 200.0

    grid_height: float = 30.0
    grid_top_height: float = 10.0
    # Distance from grid to edge
    grid_margin: float = 20.0
    # Number of holes in each row of the grid
    grid_holes: int = 5
    grid_layers: int = 10
    grid_hole_width: float = 10.0

    base_thickness: float = 25.4/16
    grid_thickness: float = 25.4/8

    def __post_init__(self):
        assert self.grid_holes >= 2
        super().__init__(name="crown")

    @target(name="grid", kind=TargetKind.DXF)
    def grid_profile(self):
        w = self.length - self.grid_margin * 2
        h = self.grid_height + self.grid_top_height

        # The width of one hole (w0) satisfies
        # n * w0 + (n+1) t = w
        # where t is the thickness of the edge
        n = self.grid_holes
        w0 = self.grid_hole_width
        t = (w - n * w0) / (n + 1)
        # The spacing is such that the first and last holes are a distance `t`
        # away from the edges, so it satisfies
        # t + w0/2 + (n-1) * s + w0/2 + t = w
        step = (w - t*2 - w0) / (n - 1)
        return (
            Cq.Sketch()
            .push([(0, h/2)])
            .rect(w, h)
            .push([
                (i * step + t + w0/2 - w/2, self.grid_height/2)
                for i in range(0, n)
            ])
            .rect(w0, self.grid_height, mode='s')
        )