import { Camera } from './Camera.js';

class OrthographicCamera extends Camera {
	constructor(left = -1, right = 1, top = 1, bottom = -1, near = 0.1, far = 2000) {
		super();

		this.type = 'OrthographicCamera';

		this.zoom = 1;
		this.view = null;

		this.left = left;
		this.right = right;
		this.top = top;
		this.bottom = bottom;

		this.near = near;
		this.far = far;

		this.updateProjectionMatrix();
	}

	copy(source, recursive) {
		super.copy(source, recursive);

		this.left = source.left;
		this.right = source.right;
		this.top = source.top;
		this.bottom = source.bottom;
		this.near = source.near;
		this.far = source.far;

		this.zoom = source.zoom;
		this.view = source.view === null ? null : Object.assign({}, source.view);

		return this;
	}

	setViewOffset(fullWidth, fullHeight, x, y, width, height) {
		if (this.view === null) {
			this.view = {
				enabled: true,
				fullWidth: 1,
				fullHeight: 1,
				offsetX: 0,
				offsetY: 0,
				width: 1,
				height: 1,
			};
		}

		this.view.enabled = true;
		this.view.fullWidth = fullWidth;
		this.view.fullHeight = fullHeight;
		this.view.offsetX = x;
		this.view.offsetY = y;
		this.view.width = width;
		this.view.height = height;

		this.updateProjectionMatrix();
	}

	clearViewOffset() {
		if (this.view !== null) {
			this.view.enabled = false;
		}

		this.updateProjectionMatrix();
	}

	updateProjectionMatrix() {
		const dx = (this.right - this.left) / (2 * this.zoom);
		const dy = (this.top - this.bottom) / (2 * this.zoom);
		const cx = (this.right + this.left) / 2;
		const cy = (this.top + this.bottom) / 2;

		let left = cx - dx;
		let right = cx + dx;
		let top = cy + dy;
		let bottom = cy - dy;

		if (this.view !== null && this.view.enabled) {
			const scaleW = (this.right - this.left) / this.view.fullWidth / this.zoom;
			const scaleH = (this.top - this.bottom) / this.view.fullHeight / this.zoom;

			left += scaleW * this.view.offsetX;
			right = left + scaleW * this.view.width;
			top -= scaleH * this.view.offsetY;
			bottom = top - scaleH * this.view.height;
		}

		this.projectionMatrix.makeOrthographic(left, right, top, bottom, this.near, this.far);

		this.projectionMatrixInverse.copy(this.projectionMatrix).invert();
	}

	toJSON(meta) {
		const data = super.toJSON(meta);

		data.object.zoom = this.zoom;
		data.object.left = this.left;
		data.object.right = this.right;
		data.object.top = this.top;
		data.object.bottom = this.bottom;
		data.object.near = this.near;
		data.object.far = this.far;

		if (this.view !== null) data.object.view = Object.assign({}, this.view);

		return data;
	}
}

OrthographicCamera.prototype.isOrthographicCamera = true;

export { OrthographicCamera };