// common
import COMMON_GET_UV from '../glsl/common/getUV.glsl';
import COMMON_PACK_POSITION from '../glsl/common/packPosition.glsl';
import COMMON_UNPACK_POSITION from '../glsl/common/unpackPosition.glsl';

// main
import THROUGH_VERT from '../glsl/through.vert.glsl';
import CORE_THROUGH_FRAG from '../glsl/through.frag.glsl';
import CORE_CONTRAINTS_FRAG from '../glsl/constraints.frag.glsl';
// import CORE_INTEGRATE_FRAG from '../glsl/integrate.frag.glsl';
import CORE_MOUSE_FRAG from '../glsl/mouse.frag.glsl';
import CORE_NORMALS_FRAG from '../glsl/normals.frag.glsl';

const LINE_BREAK = '\n';
const ADD_COMMON_LINE = '// *** ADD COMMON ***';
function _addCommon(core: string, commonFunctions: string[]) {
	const common = commonFunctions.join(LINE_BREAK);
	return core.replace(ADD_COMMON_LINE, common);
}
const THROUGH_FRAG = _addCommon(CORE_THROUGH_FRAG, [COMMON_UNPACK_POSITION]);
const CONTRAINTS_FRAG = _addCommon(CORE_CONTRAINTS_FRAG, [COMMON_GET_UV, COMMON_PACK_POSITION, COMMON_UNPACK_POSITION]);
// const INTEGRATE_FRAG = _addCommon(CORE_INTEGRATE_FRAG, [COMMON_UNPACK_POSITION]);
const MOUSE_FRAG = _addCommon(CORE_MOUSE_FRAG, [COMMON_GET_UV, COMMON_PACK_POSITION, COMMON_UNPACK_POSITION]);
const NORMALS_FRAG = _addCommon(CORE_NORMALS_FRAG, [COMMON_GET_UV, COMMON_PACK_POSITION, COMMON_UNPACK_POSITION]);

import {RawShaderMaterial, Vector2, Vector3, IUniform} from 'three';
import {ClothController} from '../ClothController';
import {IUniformN, IUniformV2, IUniformTexture, IUniformV3} from '../../../engine/nodes/utils/code/gl/Uniforms';

type RawMaterialUniforms = {[uniform: string]: IUniform};
interface CopyUniforms extends RawMaterialUniforms {
	order: IUniformN;
	tSize: IUniformV2;
	texture: IUniformTexture;
}
interface IntegrationUniforms extends RawMaterialUniforms {
	timeDelta: IUniformN;
	time: IUniformN;
	viscosity: IUniformN;
	spring: IUniformN;
	tSize: IUniformV2;
	order: IUniformN;
	tOriginal: IUniformTexture;
	tPrevious0: IUniformTexture;
	tPrevious1: IUniformTexture;
	tPosition0: IUniformTexture;
	tPosition1: IUniformTexture;
	tViscositySpring: IUniformTexture;
}
interface MouseUniforms extends RawMaterialUniforms {
	time: IUniformN;
	vertex: IUniformN;
	coordinates: IUniformV3;
	order: IUniformN;
	tSize: IUniformV2;
	tOriginal: IUniformTexture;
	tPosition0: IUniformTexture;
	tPosition1: IUniformTexture;
}
interface ConstraintsUniforms extends RawMaterialUniforms {
	time: IUniformN;
	tSize: IUniformV2;
	order: IUniformN;
	constraintInfluence: IUniformN;
	tPosition0: IUniformTexture;
	tPosition1: IUniformTexture;
	tAdjacentsA: IUniformTexture;
	tAdjacentsB: IUniformTexture;
	tDistancesA: IUniformTexture;
	tDistancesB: IUniformTexture;
	secondaryMotionMult: IUniformN;
}
interface NormalsUniforms extends RawMaterialUniforms {
	tSize: IUniformV2;
	tPosition0: IUniformTexture;
	tPosition1: IUniformTexture;
	tAdjacentsA: IUniformTexture;
	tAdjacentsB: IUniformTexture;
}
interface CopyMaterial extends RawShaderMaterial {
	uniforms: CopyUniforms;
}
interface IntegrationMaterial extends RawShaderMaterial {
	uniforms: IntegrationUniforms;
}
interface MouseMaterial extends RawShaderMaterial {
	uniforms: MouseUniforms;
}
interface ConstraintsMaterial extends RawShaderMaterial {
	uniforms: ConstraintsUniforms;
}
interface NormalsMaterial extends RawShaderMaterial {
	uniforms: NormalsUniforms;
}

function createRawMaterial() {
	return new RawShaderMaterial({
		uniforms: {
			order: {value: null},
			tSize: {value: new Vector2()},
			texture: {value: null},
		},
		vertexShader: THROUGH_VERT,
		fragmentShader: THROUGH_FRAG,
		fog: false,
		lights: false,
		depthWrite: false,
		depthTest: false,
	});
}

export class ClothMaterialController {
	// copyToRenderTarget
	public readonly copyShader: CopyMaterial = createRawMaterial() as CopyMaterial;

	// forward-integration
	public readonly integrateShader: IntegrationMaterial = createRawMaterial() as IntegrationMaterial;
	// mouse displacement
	public readonly mouseShader: MouseMaterial = createRawMaterial() as MouseMaterial;
	// vertices relaxation
	public readonly constraintsShader: ConstraintsMaterial = createRawMaterial() as ConstraintsMaterial;
	// calculate normals
	public readonly normalsShader: NormalsMaterial = createRawMaterial() as NormalsMaterial;

	constructor(public readonly mainController: ClothController) {
		const integrationFragmentShader = this.mainController.integrationFragmentShader();
		if (!integrationFragmentShader) {
			throw 'no integrationFragmentShader';
		}
		this.integrateShader.fragmentShader = _addCommon(integrationFragmentShader, [COMMON_UNPACK_POSITION]);
		this.integrateShader.uniforms = {
			timeDelta: this.mainController.scene.timeController.timeDeltaUniform(),
			time: this.mainController.scene.timeController.timeUniform(),
			viscosity: {value: 0.1},
			spring: {value: 1},
			tSize: {value: new Vector2()},
			order: {value: -1},
			tOriginal: {value: null},
			tPrevious0: {value: null},
			tPrevious1: {value: null},
			tPosition0: {value: null},
			tPosition1: {value: null},
			tViscositySpring: {value: null},
		};
		this.mainController.addMaterialUniforms(this.integrateShader);

		this.mouseShader.fragmentShader = MOUSE_FRAG;
		this.mouseShader.uniforms = {
			time: this.mainController.scene.timeController.timeUniform(),
			vertex: {value: -1},
			coordinates: {value: new Vector3()},
			order: {value: -1},
			tSize: {value: new Vector2()},
			tOriginal: {value: null},
			tPosition0: {value: null},
			tPosition1: {value: null},
		};

		this.constraintsShader.fragmentShader = CONTRAINTS_FRAG;
		this.constraintsShader.uniforms = {
			time: this.mainController.scene.timeController.timeUniform(),
			tSize: {value: new Vector2()},
			order: {value: -1},
			constraintInfluence: {value: 0},
			tPosition0: {value: null},
			tPosition1: {value: null},
			tAdjacentsA: {value: null},
			tAdjacentsB: {value: null},
			tDistancesA: {value: null},
			tDistancesB: {value: null},
			secondaryMotionMult: {value: 0},
		};

		this.normalsShader.fragmentShader = NORMALS_FRAG;
		this.normalsShader.uniforms = {
			tSize: {value: new Vector2()},
			tPosition0: {value: null},
			tPosition1: {value: null},
			tAdjacentsA: {value: null},
			tAdjacentsB: {value: null},
		};
	}
}