/**
 * AWS download helper
 * @author Nike
 * @version 1.0
 * @category MyEic
 * @subcategory Libraries
 */
class AwsFileDownload { 

    options = {
        pdf : {     url: 'https://api.dev.eismea.eu/stable/vod/source?file=', 
                    method: 'GET',
                    headers: {  'Accept': 'application/json', 
                                'Content-Type': 'application/json',
                        },
                    credentials: 'include',
                },
    }
    
    constructor(options) { 
        this.mergeOptionsNode(this.options, options);
    }
    
	mergeOptionsNode(target, source) {
		for (let option in source) {
			if(typeof source[option] === 'object' && !Array.isArray(source[option]) && (option in target) && !(target[option] instanceof(Element))) {
				this.mergeOptionsNode(target[option], source[option]);
			} else {
				target[option] = source[option];
			}	
		}
	}

    async getDownloadUrl(type, filename) {
        let response
        let uri = this.options[type].url+filename
        try {
            let foptions = {
                method: this.options[type].method,
                headers: this.options[type].headers,
            }
            if(this.options[type].credentials) foptions['credentials'] = this.options[type].credentials
            response = await fetch(uri, foptions)
            response = await response.json()
            if(response && response.payload && response.payload.url) return(response.payload.url)
            return(null)
        } catch(debugMessage) {
            console.warn('Error getting upload signed URL:',debugMessage)
            return('')
        }        
    }

}