import struct
import vec3

vertex_table = [
    ((-1.0, 1.0, -1.0), (0.0, 1.0, 0.0), (1.0, 0.0)),
    ((1.0, 1.0, 1.0), (0.0, 1.0, 0.0), (0.0, 1.0)),
    ((1.0, 1.0, -1.0), (0.0, 1.0, 0.0), (0.0, 0.0)),
    ((1.0, 1.0, 1.0), (0.0, 0.0, 1.0), (1.0, 1.0)),
    ((-1.0, -1.0, 1.0), (0.0, 0.0, 1.0), (0.0, 0.0)),
    ((1.0, -1.0, 1.0), (0.0, 0.0, 1.0), (1.0, 0.0)),
    ((-1.0, 1.0, 1.0), (-1.0, 0.0, 0.0), (1.0, 1.0)),
    ((-1.0, -1.0, -1.0), (-1.0, 0.0, 0.0), (0.0, 0.0)),
    ((-1.0, -1.0, 1.0), (-1.0, 0.0, 0.0), (1.0, 0.0)),
    ((1.0, -1.0, -1.0), (0.0, -1.0, 0.0), (1.0, 0.0)),
    ((-1.0, -1.0, 1.0), (0.0, -1.0, 0.0), (0.0, 1.0)),
    ((-1.0, -1.0, -1.0), (0.0, -1.0, 0.0), (0.0, 0.0)),
    ((1.0, 1.0, -1.0), (1.0, 0.0, 0.0), (1.0, 1.0)),
    ((1.0, -1.0, 1.0), (1.0, 0.0, 0.0), (0.0, 0.0)),
    ((1.0, -1.0, -1.0), (1.0, 0.0, 0.0), (1.0, 0.0)),
    ((-1.0, 1.0, -1.0), (0.0, 0.0, -1.0), (1.0, 1.0)),
    ((1.0, -1.0, -1.0), (0.0, 0.0, -1.0), (0.0, 0.0)),
    ((-1.0, -1.0, -1.0), (0.0, 0.0, -1.0), (1.0, 0.0)),
    ((-1.0, 1.0, 1.0), (0.0, 1.0, 0.0), (1.0, 1.0)),
    ((-1.0, 1.0, 1.0), (0.0, 0.0, 1.0), (0.0, 1.0)),
    ((-1.0, 1.0, -1.0), (-1.0, 0.0, 0.0), (0.0, 1.0)),
    ((1.0, -1.0, 1.0), (0.0, -1.0, 0.0), (1.0, 1.0)),
    ((1.0, 1.0, 1.0), (1.0, 0.0, 0.0), (0.0, 1.0)),
    ((1.0, 1.0, -1.0), (0.0, 0.0, -1.0), (0.0, 1.0))
]

faces_by_normal = {
    (-1.0, 0.0, 0.0): [6, 7, 8, 6, 20, 7],
    (0.0, -1.0, 0.0): [9, 10, 11, 9, 21, 10],
    (0.0, 0.0, -1.0): [15, 16, 17, 15, 23, 16],
    (0.0, 0.0, 1.0): [3, 4, 5, 3, 19, 4],
    (0.0, 1.0, 0.0): [0, 1, 2, 0, 18, 1],
    (1.0, 0.0, 0.0): [12, 13, 14, 12, 22, 13]
}

normals = [
    (-1.0, 0.0, 0.0),
    (0.0, -1.0, 0.0),
    (0.0, 0.0, -1.0),
    (0.0, 0.0, 1.0),
    (0.0, 1.0, 0.0),
    (1.0, 0.0, 0.0),
]

def build_configuration_index_buffers(f):
    offset = 0
    configuration_offsets = []
    for configuration in range(64):
        configuration_offsets.append(offset)
        for i in range(6):
            if (configuration & (1 << i)) == 0:
                continue
            normal = normals[i]
            indices = faces_by_normal[normal]
            for index in indices:
                f.write(struct.pack("<B", index))
                offset += 1

    for i, offset in enumerate(configuration_offsets):
        print(str(offset).rjust(4), end=", ")
        if i % 8 == 7:
            print()

def build_vertex_buffer(f):
    for position, normal, texture in vertex_table:
        position = vec3.mul(position, 0.5)
        f.write(struct.pack("<eeeeeeee", *position, *normal, *texture))

if __name__ == "__main__":
    with open("configuration.idx", "wb") as f:
        build_configuration_index_buffers(f)

    with open("per_vertex.vtx", "wb") as f:
        build_vertex_buffer(f)