module.exports = (function () {
	
	var filterSlug = function(ctx,value) {
		return ctx.filterValue(value,['.',',','/','=','&','?',' '],'', function (part) {
			return part; // todo use fully correct uri removeal and escaping.
		})
	};

	var createTViewSlug = function(tentity) {
		var uriViewSlash = '/';
		var slug = uriViewSlash + tentity.tslug;
		if (!tentity.tenable || !tentity.tparent) {
			slug = '';
		}
		if (tentity.tparent) {
			return createTViewSlug(tentity.tparent)+slug;
		}
		return slug;
	};
	
	return function AutoTSlugPlugin() {
		
		this.configPlugin = function (ctx) {
			ctx.key='autoTSlug';
			ctx.description='Auto fills and checks the tslug fields.';
		};
		
		this.fillTField = function(ctx) {
			if (ctx.tfield.tslug === undefined || ctx.tfield.tslug === null) {
				ctx.tfield.tslug = ctx.tfield.tid;
			}
			ctx.tfield.tslug = filterSlug(ctx,ctx.tfield.tslug);
		};
		
		this.fillTEntity = function(ctx) {
			if (ctx.tentity.tslug === null) {
				ctx.tentity.tslug = ctx.tentity.tid;
			}
			ctx.tentity.tslug = filterSlug(ctx,ctx.tentity.tslug);
		};
		
		this.fillTView = function(ctx) {
			ctx.tview.tslug = createTViewSlug(ctx.tentity).substring(1);
		}
	};
})();