$(document).ready(function(){
	$('#prepare_sub').click(function(e){
		e.preventDefault();
		var fi = document.getElementById("userfile");
		var file = fi.files[0];;
		if (JSZip.support.blob) {	// Check if Browser supports ZIP
			var zip = new JSZip();
			//add all files to zip 
			addFileToZip(file);
			function addFileToZip(n) {
				var arrayBuffer;
				var fileReader = new FileReader();
				fileReader.onloadend = function() {
					arrayBuffer = this.result;
					let chker = partof(arrayBuffer,4096);
					if (chker.toUpperCase().includes('<QSO_DATE')) {
						zip.file($("#fhash").val()+'.adif', arrayBuffer, { binary:true });
						zip.generateAsync({type:"blob", compression:"DEFLATE"}).then(function(content){

							//generated zip content to file type
							var files = new File([content], file.name + ".zip");

							const dataTransfer = new DataTransfer();
							dataTransfer.items.add(files);
							//send generated file to server
							fi.files=dataTransfer.files;
							$("#upform").submit();
							return;
						});
					} else {
						alert("Unsupported File. Must be ADIF");
					}

				};
				fileReader.readAsArrayBuffer(file);
			}
		} else {
			$("#upform").submit();
		}
	});
	$('#markExportedToLotw').click(function(e){
		let form = $(this).closest('form');
		let station = form.find('select[name=station_profile]');
		if (station.val() == 0) {
			station.addClass('is-invalid');
		}else{
			form.submit();
		}
	})

	function partof(buf,size) {
		return String.fromCharCode.apply(null, new Uint8Array(buf.slice(0,size-1)));
	}

});
