/**
 * Copyright (c) 2018-2019 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 */

import { Vec3 } from '../../mol-math/linear-algebra'
import { Primitive, PrimitiveBuilder } from './primitive';
import { polygon } from './polygon'
import { PrismCage } from './prism';
import { Cage } from './cage';

const a = Vec3.zero(), b = Vec3.zero(), c = Vec3.zero(), d = Vec3.zero()
const points = polygon(3, false)

/**
 * Create a prism with a triangular base
 */
export function createWedge(): Primitive {
    const builder = PrimitiveBuilder(8)

    // create sides
    for (let i = 0; i < 3; ++i) {
        const ni = (i + 1) % 3
        Vec3.set(a, points[i * 3], points[i * 3 + 1], -0.5)
        Vec3.set(b, points[ni * 3], points[ni * 3 + 1], -0.5)
        Vec3.set(c, points[ni * 3], points[ni * 3 + 1], 0.5)
        Vec3.set(d, points[i * 3], points[i * 3 + 1], 0.5)
        builder.add(a, b, c)
        builder.add(c, d, a)
    }

    // create bases
    Vec3.set(a, points[0], points[1], -0.5)
    Vec3.set(b, points[3], points[4], -0.5)
    Vec3.set(c, points[6], points[7], -0.5)
    builder.add(c, b, a)
    Vec3.set(a, points[0], points[1], 0.5)
    Vec3.set(b, points[3], points[4], 0.5)
    Vec3.set(c, points[6], points[7], 0.5)
    builder.add(a, b, c)

    return builder.getPrimitive()
}

let wedge: Primitive
export function Wedge() {
    if (!wedge) wedge = createWedge()
    return wedge
}

let wedgeCage: Cage
export function WedgeCage() {
    if (!wedgeCage) wedgeCage = PrismCage(points)
    return wedgeCage
}