import { LinearFilter, LinearMipmapLinearFilter, ClampToEdgeWrapping } from '../constants.js';
import { FileLoader } from './FileLoader.js';
import { DataTexture } from '../textures/DataTexture.js';
import { Loader } from './Loader.js';

/**
 * Abstract Base class to load generic binary textures formats (rgbe, hdr, ...)
 *
 * Sub classes have to implement the parse() method which will be used in load().
 */

class DataTextureLoader extends Loader {
	constructor(manager) {
		super(manager);
	}

	load(url, onLoad, onProgress, onError) {
		const scope = this;

		const texture = new DataTexture();

		const loader = new FileLoader(this.manager);
		loader.setResponseType('arraybuffer');
		loader.setRequestHeader(this.requestHeader);
		loader.setPath(this.path);
		loader.setWithCredentials(scope.withCredentials);
		loader.load(
			url,
			function (buffer) {
				const texData = scope.parse(buffer);

				if (!texData) return;

				if (texData.image !== undefined) {
					texture.image = texData.image;
				} else if (texData.data !== undefined) {
					texture.image.width = texData.width;
					texture.image.height = texData.height;
					texture.image.data = texData.data;
				}

				texture.wrapS = texData.wrapS !== undefined ? texData.wrapS : ClampToEdgeWrapping;
				texture.wrapT = texData.wrapT !== undefined ? texData.wrapT : ClampToEdgeWrapping;

				texture.magFilter = texData.magFilter !== undefined ? texData.magFilter : LinearFilter;
				texture.minFilter = texData.minFilter !== undefined ? texData.minFilter : LinearFilter;

				texture.anisotropy = texData.anisotropy !== undefined ? texData.anisotropy : 1;

				if (texData.encoding !== undefined) {
					texture.encoding = texData.encoding;
				}

				if (texData.flipY !== undefined) {
					texture.flipY = texData.flipY;
				}

				if (texData.format !== undefined) {
					texture.format = texData.format;
				}

				if (texData.type !== undefined) {
					texture.type = texData.type;
				}

				if (texData.mipmaps !== undefined) {
					texture.mipmaps = texData.mipmaps;
					texture.minFilter = LinearMipmapLinearFilter; // presumably...
				}

				if (texData.mipmapCount === 1) {
					texture.minFilter = LinearFilter;
				}

				if (texData.generateMipmaps !== undefined) {
					texture.generateMipmaps = texData.generateMipmaps;
				}

				texture.needsUpdate = true;

				if (onLoad) onLoad(texture, texData);
			},
			onProgress,
			onError
		);

		return texture;
	}
}

export { DataTextureLoader };