import Texture from './BaseTexture';
import ImageResource from './resources/ImageResource';
import {TARGETS} from './../const';

export default class ArrayTexture extends Texture
{
    constructor(width, height, size, format)
    {
        super(null, 0, 1, width, height, format);

        this.target = TARGETS.TEXTURE_2D_ARRAY;
        this.size = size;
        this._new = true;
        this.array = [];
    }

    setResource(resource, index)
    {
        var layer = this.array[index];
        if(!layer)
        {
            layer = this.array[index] = {index:index, texture:this, resource:null, texturePart:true, dirtyId:0};
        }

        layer.resource = resource;

        resource.load.then((resource) => {

            if(layer.resource === resource)
            {
                this.validate();
                this.dirtyId++;
            }

        })
    }

    validate()
    {
        let valid = true;

        if(this.width === -1 || this.height === -1)
        {
            valid = false;
        }

        if(this.array)
        {
            for (var i = 0; i < this.array.length; i++) {

                const layer = this.array[i];

                if(layer.resource && !layer.resource.loaded)
                {
                    valid = false;
                    break;
                }
            }
        }

        this.valid = valid;
    }

    static from(width, height, ...urls)
    {
        var arrayTexture = new ArrayTexture(width, height);

        for (var i = 0; i < 6; i++)
        {
            arrayTexture.setResource(ImageResource.from(urls[i % urls.length]), i);
        }

        return arrayTexture;
    }
}