<apex:page showHeader="false" sidebar="false" standardController="Inspection_Step__c">
	<!-- Remote Objects definition to set accessible sObjects and fields -->
    <apex:remoteObjects >
        <apex:remoteObjectModel name="Inspection_Step__c" jsShorthand="step"
            fields="Name,Id,Inspection__c,Step_Number__c,Rating__c">
        </apex:remoteObjectModel>
    </apex:remoteObjects>


	<script type="text/javascript">

            //create a js variable for the remoteObjects
			var step = new SObjectModel.step();

			// find steps for the matching inspection, where there is no status
            step.retrieve({
            	where: {
            		//same parent as the context object
            		Inspection__c: {eq: '{!Inspection_Step__c.Inspection__c}'},
            		//hasn't been rated yet
            		Rating__c: {eq: ''},
            	},
            	//in ascending order
            	orderby: [{Step_Number__c: 'ASC'}],
            }, function(err, records, event){
                if(err) {
                    alert(err.message);
                }
                else {
            		//no records left, navigate back to inspection
                    if (records.length===0){
                		alert('all steps are complete!');
                		navigate('{!Inspection_Step__c.Inspection__c}');
                	} else if (records[records.length-1].get('Step_Number__c') < {!Inspection_Step__c.Step_Number__c} ) {
                		//the higest step is lower number than context step; go back to the lowest step
                		navigate(records[0].get("Id"));
                	} else {
                		//loop through records
                		for (var i=0; i<records.length; i++) {
                			if (records[i].get('Step_Number__c') > {!Inspection_Step__c.Step_Number__c} ){
                				console.log('navigate to next: ' + records[i].get('Step_Number__c'));

                				navigate(records[i].get("Id"));
                				break;
                			}
                		};
                	}
                }
            });

            //universal navigation that works in SF1 or in web desktop UI
			function navigate (recordId){

				if (typeof sforce !== 'undefined'){
					sforce.one.navigateToSObject(recordId);
				} else {
					//.top to deal with the fact that publisher actions in chatter feed are iframe
			        window.top.location.href= "/" + recordId;
			    }

			}

	</script>

</apex:page>