(function () {
	'use strict';

	function postRequest(action, data, onSuccess, onFailure) {
		var xhr = new XMLHttpRequest();
		var body = [];
		var key;

		for (key in data) {
			if (Object.prototype.hasOwnProperty.call(data, key)) {
				body.push(encodeURIComponent(key) + '=' + encodeURIComponent(data[key]));
			}
		}

		xhr.open('POST', '/ajax.php?a=' + action, true);
		xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
		xhr.onreadystatechange = function () {
			if (xhr.readyState !== 4) {
				return;
			}
			if (xhr.status >= 200 && xhr.status < 300) {
				onSuccess(xhr.responseText);
			} else if (onFailure) {
				onFailure();
			}
		};
		xhr.send(body.join('&'));
	}

	function setOrganizationRequired(required) {
		var pairs = [
			['org_organizacja', 'org_organizacja_Req'],
			['org_telefon', 'org_telefon_Req'],
			['org_ulica', 'org_ulica_Req'],
			['org_miasto', 'org_miasto_Req'],
			['org_kod', 'org_kod_Req'],
			['org_kraj', 'org_kraj_Req']
		];
		var organization = document.getElementById('organizacja');

		pairs.forEach(function (pair) {
			var fromId = required ? pair[0] : pair[1];
			var toId = required ? pair[1] : pair[0];
			var element = document.getElementById(fromId);
			if (element) {
				element.id = toId;
			}
		});

		if (organization) {
			organization.style.display = required ? '' : 'none';
		}
	}

	function updateOkresySsl(pakiet) {
		var okr = document.getElementById('okr');
		postRequest('okresy_ssl', { pakiet: pakiet }, function (responseText) {
			if (okr) {
				okr.innerHTML = responseText;
			}
		}, function () {
			if (okr) {
				okr.innerHTML = 'Wystąpił błąd, prosimy spróbować ponownie później';
			}
		});
	}

	window.syst = function (s) {
		var pakiet = document.getElementById('pakiet');
		var instl = document.getElementById('instl');

		postRequest('panele', {
			system: s,
			pakiet: pakiet ? pakiet.value : ''
		}, function (responseText) {
			if (instl) {
				instl.innerHTML = responseText;
			}
		}, function () {
			if (instl) {
				instl.innerHTML = 'Wystąpił błąd, prosimy spróbować ponownie później';
			}
		});
	};

	window.zmiana = function (id) {
		var s1 = document.getElementById('s1');
		var s2 = document.getElementById('s2');
		var target = document.getElementById(id);
		if (s1) {
			s1.classList.remove('klik');
		}
		if (s2) {
			s2.classList.remove('klik');
		}
		if (target) {
			target.classList.add('klik');
		}
	};

	document.addEventListener('DOMContentLoaded', function () {
		var orgPakiety = [6, 7, 8, 9, 11, 12, 13, 14];
		var pakietReq = document.getElementById('pakiet_Req');
		var s1 = document.getElementById('s1');
		var s2 = document.getElementById('s2');
		var b1 = document.getElementById('b1');
		var b2 = document.getElementById('b2');

		var wybranyPakiet = 6;
		if (orgPakiety.indexOf(wybranyPakiet) !== -1) {
			setOrganizationRequired(true);
		}
		updateOkresySsl(wybranyPakiet);

		if (pakietReq) {
			pakietReq.addEventListener('change', function () {
				var selectedValue = parseInt(pakietReq.value, 10);
				setOrganizationRequired(orgPakiety.indexOf(selectedValue) !== -1);
				updateOkresySsl(pakietReq.value);
			});
		}

		if (s1) {
			s1.addEventListener('click', function () { window.zmiana('s1'); });
		}
		if (s2) {
			s2.addEventListener('click', function () { window.zmiana('s2'); });
		}
		if (b1) {
			b1.addEventListener('click', function () { window.zmiana('s1'); });
		}
		if (b2) {
			b2.addEventListener('click', function () { window.zmiana('s2'); });
		}
	});
})();