/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated May 1, 2019. Replaces all prior versions.
 *
 * Copyright (c) 2013-2019, 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.
 *
 * THIS SOFTWARE IS 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 THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

module spine.threejs {
	export class SkeletonMeshMaterial extends THREE.ShaderMaterial {
		constructor () {
			let vertexShader = `
				attribute vec4 color;
				varying vec2 vUv;
				varying vec4 vColor;
				void main() {
					vUv = uv;
					vColor = color;
					gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0);
				}
			`;
			let fragmentShader = `
				uniform sampler2D map;
				varying vec2 vUv;
				varying vec4 vColor;
				void main(void) {
					gl_FragColor = texture2D(map, vUv)*vColor;
				}
			`;

			let parameters: THREE.ShaderMaterialParameters = {
				uniforms: {
					map: { type: "t", value: null }
				},
				vertexShader: vertexShader,
				fragmentShader: fragmentShader,
				side: THREE.DoubleSide,
				transparent: true,
				alphaTest: 0.5
			};
			super(parameters);
		};
	}

	export class SkeletonMesh extends THREE.Object3D {
		tempPos: Vector2 = new Vector2();
		tempUv: Vector2 = new Vector2();
		tempLight = new Color();
		tempDark = new Color();
		skeleton: Skeleton;
		state: AnimationState;
		zOffset: number = 0.1;
		vertexEffect: VertexEffect;

		private batches = new Array<MeshBatcher>();
		private nextBatchIndex = 0;
		private clipper: SkeletonClipping = new SkeletonClipping();

		static QUAD_TRIANGLES = [0, 1, 2, 2, 3, 0];
		static VERTEX_SIZE = 2 + 2 + 4;

		private vertices = Utils.newFloatArray(1024);
		private tempColor = new Color();

		constructor (skeletonData: SkeletonData) {
			super();

			this.skeleton = new Skeleton(skeletonData);
			let animData = new AnimationStateData(skeletonData);
			this.state = new AnimationState(animData);
		}

		update(deltaTime: number) {
			let state = this.state;
			let skeleton = this.skeleton;

			state.update(deltaTime);
			state.apply(skeleton);
			skeleton.updateWorldTransform();

			this.updateGeometry();
		}

		dispose () {
			for (var i = 0; i < this.batches.length; i++) {
				this.batches[i].dispose();
			}
		}

		private clearBatches () {
			for (var i = 0; i < this.batches.length; i++) {
				this.batches[i].clear();
				this.batches[i].visible = false;
			}
			this.nextBatchIndex = 0;
		}

		private nextBatch () {
			if (this.batches.length == this.nextBatchIndex) {
				let batch = new MeshBatcher();
				this.add(batch);
				this.batches.push(batch);
			}
			let batch = this.batches[this.nextBatchIndex++];
			batch.visible = true;
			return batch;
		}

		private updateGeometry() {
			this.clearBatches();

			let tempPos = this.tempPos;
			let tempUv = this.tempUv;
			let tempLight = this.tempLight;
			let tempDark = this.tempDark;

			var numVertices = 0;
			var verticesLength = 0;
			var indicesLength = 0;

			let blendMode: BlendMode = null;
			let clipper = this.clipper;

			let vertices: ArrayLike<number> = this.vertices;
			let triangles: Array<number> = null;
			let uvs: ArrayLike<number> = null;
			let drawOrder = this.skeleton.drawOrder;
			let batch = this.nextBatch();
			batch.begin();
			let z = 0;
			let zOffset = this.zOffset;
			for (let i = 0, n = drawOrder.length; i < n; i++) {
				let vertexSize = clipper.isClipping() ? 2 : SkeletonMesh.VERTEX_SIZE;
				let slot = drawOrder[i];
				if (!slot.bone.active) continue;
				let attachment = slot.getAttachment();
				let attachmentColor: Color = null;
				let texture: ThreeJsTexture = null;
				let numFloats = 0;
				if (attachment instanceof RegionAttachment) {
					let region = <RegionAttachment>attachment;
					attachmentColor = region.color;
					vertices = this.vertices;
					numFloats = vertexSize * 4;
					region.computeWorldVertices(slot.bone, vertices, 0, vertexSize);
					triangles = SkeletonMesh.QUAD_TRIANGLES;
					uvs = region.uvs;
					texture = <ThreeJsTexture>(<TextureAtlasRegion>region.region.renderObject).texture;
				} else if (attachment instanceof MeshAttachment) {
					let mesh = <MeshAttachment>attachment;
					attachmentColor = mesh.color;
					vertices = this.vertices;
					numFloats = (mesh.worldVerticesLength >> 1) * vertexSize;
					if (numFloats > vertices.length) {
						vertices = this.vertices = spine.Utils.newFloatArray(numFloats);
					}
					mesh.computeWorldVertices(slot, 0, mesh.worldVerticesLength, vertices, 0, vertexSize);
					triangles = mesh.triangles;
					uvs = mesh.uvs;
					texture = <ThreeJsTexture>(<TextureAtlasRegion>mesh.region.renderObject).texture;
				} else if (attachment instanceof ClippingAttachment) {
					let clip = <ClippingAttachment>(attachment);
					clipper.clipStart(slot, clip);
					continue;
				} else continue;

				if (texture != null) {
					let skeleton = slot.bone.skeleton;
					let skeletonColor = skeleton.color;
					let slotColor = slot.color;
					let alpha = skeletonColor.a * slotColor.a * attachmentColor.a;
					let color = this.tempColor;
					color.set(skeletonColor.r * slotColor.r * attachmentColor.r,
							skeletonColor.g * slotColor.g * attachmentColor.g,
							skeletonColor.b * slotColor.b * attachmentColor.b,
							alpha);

					let finalVertices: ArrayLike<number>;
					let finalVerticesLength: number;
					let finalIndices: ArrayLike<number>;
					let finalIndicesLength: number;

					if (clipper.isClipping()) {
						clipper.clipTriangles(vertices, numFloats, triangles, triangles.length, uvs, color, null, false);
						let clippedVertices = clipper.clippedVertices;
						let clippedTriangles = clipper.clippedTriangles;
						if (this.vertexEffect != null) {
							let vertexEffect = this.vertexEffect;
							let verts = clippedVertices;
							for (let v = 0, n = clippedVertices.length; v < n; v += vertexSize) {
								tempPos.x = verts[v];
								tempPos.y = verts[v + 1];
								tempLight.setFromColor(color);
								tempDark.set(0, 0, 0, 0);
								tempUv.x = verts[v + 6];
								tempUv.y = verts[v + 7];
								vertexEffect.transform(tempPos, tempUv, tempLight, tempDark);
								verts[v] = tempPos.x;
								verts[v + 1] = tempPos.y;
								verts[v + 2] = tempLight.r;
								verts[v + 3] = tempLight.g;
								verts[v + 4] = tempLight.b;
								verts[v + 5] = tempLight.a;
								verts[v + 6] = tempUv.x;
								verts[v + 7] = tempUv.y;
							}
						}
						finalVertices = clippedVertices;
						finalVerticesLength = clippedVertices.length;
						finalIndices = clippedTriangles;
						finalIndicesLength = clippedTriangles.length;
					} else {
						let verts = vertices;
						if (this.vertexEffect != null) {
							let vertexEffect = this.vertexEffect;
							for (let v = 0, u = 0, n = numFloats; v < n; v += vertexSize, u += 2) {
								tempPos.x = verts[v];
								tempPos.y = verts[v + 1];
								tempLight.setFromColor(color);
								tempDark.set(0, 0, 0, 0);
								tempUv.x = uvs[u];
								tempUv.y = uvs[u + 1];
								vertexEffect.transform(tempPos, tempUv, tempLight, tempDark);
								verts[v] = tempPos.x;
								verts[v + 1] = tempPos.y;
								verts[v + 2] = tempLight.r;
								verts[v + 3] = tempLight.g;
								verts[v + 4] = tempLight.b;
								verts[v + 5] = tempLight.a;
								verts[v + 6] = tempUv.x;
								verts[v + 7] = tempUv.y;
							}
						} else {
							for (let v = 2, u = 0, n = numFloats; v < n; v += vertexSize, u += 2) {
								verts[v] = color.r;
								verts[v + 1] = color.g;
								verts[v + 2] = color.b;
								verts[v + 3] = color.a;
								verts[v + 4] = uvs[u];
								verts[v + 5] = uvs[u + 1];
							}
						}
						finalVertices = vertices;
						finalVerticesLength = numFloats;
						finalIndices = triangles;
						finalIndicesLength = triangles.length;
					}

					if (finalVerticesLength == 0 || finalIndicesLength == 0)
						continue;

					// Start new batch if this one can't hold vertices/indices
					if (!batch.canBatch(finalVerticesLength, finalIndicesLength)) {
						batch.end();
						batch = this.nextBatch();
						batch.begin();
					}

					// FIXME per slot blending would require multiple material support
					//let slotBlendMode = slot.data.blendMode;
					//if (slotBlendMode != blendMode) {
					//	blendMode = slotBlendMode;
					//	batcher.setBlendMode(getSourceGLBlendMode(this._gl, blendMode, premultipliedAlpha), getDestGLBlendMode(this._gl, blendMode));
					//}

					let batchMaterial = <SkeletonMeshMaterial>batch.material;
					if (batchMaterial.uniforms.map.value == null) {
						batchMaterial.uniforms.map.value = texture.texture;
					}
					if (batchMaterial.uniforms.map.value != texture.texture) {
						batch.end();
						batch = this.nextBatch();
						batch.begin();
						batchMaterial = <SkeletonMeshMaterial>batch.material;
						batchMaterial.uniforms.map.value = texture.texture;
					}
					batchMaterial.needsUpdate = true;

					batch.batch(finalVertices, finalVerticesLength, finalIndices, finalIndicesLength, z);
					z += zOffset;
				}

				clipper.clipEndWithSlot(slot);
			}
			clipper.clipEnd();
			batch.end();
		}
	}
}