(function(app) {
	'use strict';
	
	// Listen on submit events on body (events from forms will bubble up)
	document.body.addEventListener('submit', function(e) {
		// Find closest form parent
		var form = e.target.closest('.contact__form');
		
		// Only continue if the form was found and if we have Promise support
		if(!form || !Promise) return;
		e.preventDefault();
		
		// Disable the submit button and display the animated stamp
		console.info('Sending form data');
		form._submit.disabled = true;
		form.classList.add('form--sent');
		
		// Get form data
		var data = new FormData(form);
		
		// Send the form data via AJAX 
		var options = {
			method: 'POST',
			body: data,
			credentials: 'same-origin',
			headers: {'Accept': 'application/json'}
		};
		var dataPromise = fetch(form.action, options)
		                  	.then(app.validateHttpStatus)
		                  	.then(app.parseJsonResponse);
		
		// Wait for the stamp animation
		Promise.all([dataPromise, app.timerPromise(750)])
			.then(function(values) {
				// Get the result of the data promise
				var data = values[0];
				
				// Mark the (in)valid fields
				for(var field in data.fields) {
					// Add the class if value is true, otherwise remove it
					form[field].classList.toggle('input--invalid', data.fields[field]);
				}
				
				// Check if the form submission was successful
				if(data.success) {
					form.querySelector('.form__message').innerText = '';
					document.querySelector('.contact__thank-you').innerText = data.message;
					form.classList.add('form--success');
				} else {
					// Throw message to catch it below, because apparently our code is a dog
					throw data.message;
				}
			})
			.catch(function(err) {
				console.error(err);
				
				// Display the error to the user
				form.classList.remove('form--sent');
				form.querySelector('.form__message').innerHTML = err;
				
				// Enable the submit button again
				form._submit.disabled = false;
			});
	});
})(window.app = window.app || {});