/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated July 28, 2023. Replaces all prior versions.
 *
 * Copyright (c) 2013-2023, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software or
 * otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE
 * SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

import { BlendMode, Texture, TextureFilter, TextureWrap } from "@esotericsoftware/spine-core";
import * as THREE from "three";

export class ThreeJsTexture extends Texture {
	texture: THREE.Texture;

	constructor (image: HTMLImageElement | ImageBitmap, pma = false) {
		super(image);
		if (image instanceof ImageBitmap)
			this.texture = new THREE.CanvasTexture(image);
		else
			this.texture = new THREE.Texture(image);
		// if the texture is not pma, we ask to threejs to premultiply on upload
		this.texture.premultiplyAlpha = !pma;
		this.texture.flipY = false;

		// Keep this as a reference - this is necessary in future versions of ThreeJS
		// this.texture.colorSpace = THREE.SRGBColorSpace;

		this.texture.needsUpdate = true;
	}

	setFilters (minFilter: TextureFilter, magFilter: TextureFilter) {
		this.texture.minFilter = ThreeJsTexture.toThreeJsMinificationTextureFilter(minFilter);
		this.texture.magFilter = ThreeJsTexture.toThreeJsMagnificationTextureFilter(magFilter);
	}

	setWraps (uWrap: TextureWrap, vWrap: TextureWrap) {
		this.texture.wrapS = ThreeJsTexture.toThreeJsTextureWrap(uWrap);
		this.texture.wrapT = ThreeJsTexture.toThreeJsTextureWrap(vWrap);
	}

	dispose () {
		this.texture.dispose();
	}

	static toThreeJsMinificationTextureFilter (filter: TextureFilter): THREE.MinificationTextureFilter {
		if (filter === TextureFilter.Linear) return THREE.LinearFilter;
		else if (filter === TextureFilter.MipMap) return THREE.LinearMipMapLinearFilter; // also includes TextureFilter.MipMapLinearLinear
		else if (filter === TextureFilter.MipMapLinearNearest) return THREE.LinearMipMapNearestFilter;
		else if (filter === TextureFilter.MipMapNearestLinear) return THREE.NearestMipMapLinearFilter;
		else if (filter === TextureFilter.MipMapNearestNearest) return THREE.NearestMipMapNearestFilter;
		else if (filter === TextureFilter.Nearest) return THREE.NearestFilter;
		else throw new Error("Unknown texture filter: " + filter);
	}

	static toThreeJsMagnificationTextureFilter (filter: TextureFilter): THREE.MagnificationTextureFilter {
		if (filter === TextureFilter.Linear) return THREE.LinearFilter;
		else if (filter === TextureFilter.MipMap) return THREE.LinearFilter;
		else if (filter === TextureFilter.MipMapLinearNearest) return THREE.NearestFilter;
		else if (filter === TextureFilter.MipMapNearestLinear) return THREE.LinearFilter;
		else if (filter === TextureFilter.MipMapNearestNearest) return THREE.NearestFilter;
		else if (filter === TextureFilter.Nearest) return THREE.NearestFilter;
		else throw new Error("Unknown texture filter: " + filter);
	}

	static toThreeJsTextureWrap (wrap: TextureWrap) {
		if (wrap === TextureWrap.ClampToEdge) return THREE.ClampToEdgeWrapping;
		else if (wrap === TextureWrap.MirroredRepeat) return THREE.MirroredRepeatWrapping;
		else if (wrap === TextureWrap.Repeat) return THREE.RepeatWrapping;
		else throw new Error("Unknown texture wrap: " + wrap);
	}

	static fist = true;
	static toThreeJsBlending (blend: BlendMode): ThreeBlendOptions {
		if (blend === BlendMode.Normal) return { blending: THREE.NormalBlending };
		else if (blend === BlendMode.Additive) return { blending: THREE.AdditiveBlending };
		// else if (blend === BlendMode.Multiply) return { blending: THREE.NormalBlending };
		else if (blend === BlendMode.Multiply) return {
			blending: THREE.CustomBlending,
			blendSrc: THREE.DstColorFactor,
			blendDst: THREE.OneMinusSrcAlphaFactor,
			blendSrcAlpha: THREE.OneFactor,
			blendDstAlpha: THREE.OneMinusSrcAlphaFactor,
		}
		else if (blend === BlendMode.Screen) return {
			blending: THREE.CustomBlending,
			blendSrc: THREE.OneFactor,
			blendDst: THREE.OneMinusSrcColorFactor,
			blendSrcAlpha: THREE.OneFactor,
			blendDstAlpha: THREE.OneMinusSrcColorFactor,
		}
		else throw new Error("Unknown blendMode: " + blend);
	}
}

export type ThreeBlendOptions = {
	blending: THREE.Blending,
	blendSrc?: THREE.BlendingDstFactor,
	blendDst?: THREE.BlendingDstFactor,
	blendSrcAlpha?: THREE.BlendingDstFactor,
	blendDstAlpha?: THREE.BlendingDstFactor,
}