import {FLAT, POINTY} from './consts.js';
import {range, toFixed} from './utils.js';

export default class DrawHexagon {
	constructor(settings) {
		this.settings = Object.assign({}, settings);

		this.flatTopCornerX = [];
		this.flatTopCornerY = [];
		this.pointyTopCornerX = [];
		this.pointyTopCornerY = [];

		const hexSides = 6;
		const hexSlices = 24;

		range(hexSlices).forEach(hexSlice => {
			const x = toFixed(Math.cos(((hexSlice / hexSlices) * hexSides) * (2 * Math.PI) / hexSides));
			const y = toFixed(Math.sin(((hexSlice / hexSlices) * hexSides) * (2 * Math.PI) / hexSides));

			if ((hexSlice % 4) === 0) {
				const cur = hexSlice / 4;
				this.flatTopCornerX[cur] = x;
				this.flatTopCornerY[cur] = y;
			}

			if (((hexSlice-2) % 4) === 0) {
				const cur = (hexSlice-2) / 4;
				this.pointyTopCornerX[cur] = x;
				this.pointyTopCornerY[cur] = y;
			}
		});
	}

	outline(context, scale, x, y, cell) {
		scale = scale * cell.scale;
		let hexCornerX = cell.orientation === POINTY ? this.pointyTopCornerX : this.flatTopCornerX;
		let hexCornerY = cell.orientation === POINTY ? this.pointyTopCornerY : this.flatTopCornerY;

		context.beginPath();
		context.moveTo(x + scale * hexCornerX[0], y + scale * hexCornerY[0]);
		context.lineTo(x + scale * hexCornerX[1], y + scale * hexCornerY[1]);
		context.lineTo(x + scale * hexCornerX[2], y + scale * hexCornerY[2]);
		context.lineTo(x + scale * hexCornerX[3], y + scale * hexCornerY[3]);
		context.lineTo(x + scale * hexCornerX[4], y + scale * hexCornerY[4]);
		context.lineTo(x + scale * hexCornerX[5], y + scale * hexCornerY[5]);
		context.closePath();

		context.lineWidth = cell.width;
		context.strokeStyle = cell.getColor();
		context.stroke();
	}

	fill(context, scale, x, y, cell) {
		scale = scale * cell.scale;
		let hexCornerX = cell.orientation === POINTY ? this.pointyTopCornerX : this.flatTopCornerX;
		let hexCornerY = cell.orientation === POINTY ? this.pointyTopCornerY : this.flatTopCornerY;

		context.beginPath();
		context.moveTo(x + scale * hexCornerX[0], y + scale * hexCornerY[0]);
		context.lineTo(x + scale * hexCornerX[1], y + scale * hexCornerY[1]);
		context.lineTo(x + scale * hexCornerX[2], y + scale * hexCornerY[2]);
		context.lineTo(x + scale * hexCornerX[3], y + scale * hexCornerY[3]);
		context.lineTo(x + scale * hexCornerX[4], y + scale * hexCornerY[4]);
		context.lineTo(x + scale * hexCornerX[5], y + scale * hexCornerY[5]);

		context.fillStyle = cell.getColor();
		context.fill();
	}
}