import WebGPUUniformsGroup from './WebGPUUniformsGroup.js';
import { FloatUniform, Vector3Uniform } from './WebGPUUniform.js';

import NodeSlot from '../nodes/core/NodeSlot.js';
import NodeBuilder from '../nodes/core/NodeBuilder.js';

class WebGPUNodeUniformsGroup extends WebGPUUniformsGroup {
	
	constructor( shaderStage ) {

		super( 'nodeUniforms' );
		
		let shaderStageVisibility;
		
		if ( shaderStage === 'vertex' ) shaderStageVisibility = GPUShaderStage.VERTEX;
		else if ( shaderStage === 'fragment' ) shaderStageVisibility = GPUShaderStage.FRAGMENT;
			
		this.setVisibility( shaderStageVisibility );
		
		this.setOnBeforeUpdate( this._onBeforeUpdate );
		
	}
	
	_onBeforeUpdate( object, camera ) {
		
		const material = object.material;
		
		console.log( 1 );
		
	}
	
}

class WebGPUNodeBuilder extends NodeBuilder {

	constructor( material, renderer ) {

		super( material, renderer );
		
		this.uniformsGroup = {};
		
		this._parseMaterial();
		
	}
	
	_parseMaterial() {
		
		const material = this.material;
		
		if ( material.isMeshBasicMaterial ) {
			
			if ( material.color.isNode ) {
				
				this.addSlot( 'fragment', new NodeSlot( material.color, 'COLOR', 'vec3' ) );
				
			}
			
		}
		
	}
	
	getUniformNSName( nodeUniform ) {
		
		return `nodeUniforms.${nodeUniform.name}`;
		
	}
	
	getBindings() {
		
		const bindings = [];
		
		const uniformsVertexGroup = this.uniformsGroup[ 'vertex' ];
		const uniformsFragmentGroup = this.uniformsGroup[ 'fragment' ];
		
		if ( uniformsVertexGroup ) bindings.push( uniformsVertexGroup );
		if ( uniformsFragmentGroup ) bindings.push( uniformsFragmentGroup );
		
		return bindings;
		
	}
	
	createUniformFromNode( node, shaderStage, type ) {
		
		const uniformNode = super.createUniformFromNode( node, shaderStage, type ) 
		const nodeData = this.createDataFromNode( node, shaderStage );
		
		if ( nodeData.uniformGroup === undefined ) {
			
			let uniformsGroup = this.uniformsGroup[shaderStage];
			
			if (uniformsGroup === undefined) {
				
				uniformsGroup = new WebGPUNodeUniformsGroup( shaderStage );
				
				this.uniformsGroup[shaderStage] = uniformsGroup;
				
			}
			
			let uniformGroup;
			
			if ( type === 'float' ) {
				
				uniformGroup = new FloatUniform( uniformNode.name, uniformNode.value );
				
			} else if ( type === 'vec3' ) {
				
				uniformGroup = new Vector3Uniform( uniformNode.name, uniformNode.value );
				
			} else {
				
				console.error( `Uniform "${type}" not declared.` );
				
			}
			
			uniformsGroup.addUniform( uniformGroup );
			
			nodeData.uniformGroup = uniformGroup;
			
		}
		
		return uniformNode;
		
	}
	
	buildShader( shaderStage, code ) {
		
		// use regex maybe for security?
		const versionStrIndex = code.indexOf("\n");
		
		let finalCode = code.substr( 0, versionStrIndex ) + "\n\n";

		const shaderCodes = this.build( shaderStage );
		
		finalCode += shaderCodes.defines;

		finalCode += code.substr( versionStrIndex );

		console.log( finalCode );

		return finalCode;
		
	}
	
	parse( vertexShader, fragmentShader ) {
		
		vertexShader = this.buildShader( 'vertex', vertexShader );
		fragmentShader = this.buildShader( 'fragment', fragmentShader );

		return {
			vertexShader,
			fragmentShader
		};
		
	}

}

export default WebGPUNodeBuilder;