import { IAssetManager } from '../../core/asset/IAssetManager';
import { IAssetAnimation } from '../../core/asset/interfaces';
import { EventDispatcher } from '../../core/events/EventDispatcher';
import { AvatarRenderEffectLibraryEvent } from './events/AvatarRenderEffectLibraryEvent';

export class EffectAssetDownloadLibrary extends EventDispatcher
{
    public static DOWNLOAD_COMPLETE: string = 'EADL_DOWNLOAD_COMPLETE';

    private static NOT_LOADED: number = 0;
    private static LOADING: number = 1;
    private static LOADED: number = 2;

    private _state: number;
    private _libraryName: string;
    private _revision: string;
    private _downloadUrl: string;
    private _assets: IAssetManager;
    private _animation: { [index: string]: IAssetAnimation };

    constructor(id: string, revision: string, assets: IAssetManager, assetUrl: string)
    {
        super();

        this._state = EffectAssetDownloadLibrary.NOT_LOADED;
        this._libraryName = id;
        this._revision = revision;
        this._downloadUrl = assetUrl;
        this._assets = assets;
        this._animation = null;

        this._downloadUrl = this._downloadUrl.replace(/%libname%/gi, this._libraryName);
        this._downloadUrl = this._downloadUrl.replace(/%revision%/gi, this._revision);

        const asset = this._assets.getCollection(this._libraryName);

        if(asset) this._state = EffectAssetDownloadLibrary.LOADED;
    }

    public downloadAsset(): void
    {
        if(!this._assets || (this._state === EffectAssetDownloadLibrary.LOADING) || (this._state === EffectAssetDownloadLibrary.LOADED)) return;

        const asset = this._assets.getCollection(this._libraryName);

        if(asset)
        {
            this._state = EffectAssetDownloadLibrary.LOADED;

            this.dispatchEvent(new AvatarRenderEffectLibraryEvent(AvatarRenderEffectLibraryEvent.DOWNLOAD_COMPLETE, this));

            return;
        }

        this._state = EffectAssetDownloadLibrary.LOADING;

        this._assets.downloadAsset(this._downloadUrl, (flag: boolean) =>
        {
            if(flag)
            {
                this._state = EffectAssetDownloadLibrary.LOADED;

                const collection = this._assets.getCollection(this._libraryName);

                if(collection) this._animation = collection.data.animations;

                this.dispatchEvent(new AvatarRenderEffectLibraryEvent(AvatarRenderEffectLibraryEvent.DOWNLOAD_COMPLETE, this));
            }
        });
    }

    public get libraryName(): string
    {
        return this._libraryName;
    }

    public get animation(): { [index: string]: IAssetAnimation }
    {
        return this._animation;
    }

    public get isLoaded(): boolean
    {
        return (this._state === EffectAssetDownloadLibrary.LOADED);
    }
}